CN115164605B - Yellow phosphorus flue gas purification system and industrial kiln flue gas purification device - Google Patents

Abstract

The invention discloses a yellow phosphorus flue gas purification system and an industrial kiln flue gas purification device. The yellow phosphorus flue gas purification system comprises: the device comprises a smoke filtering and dust removing device, a smoke airflow driving device, a yellow phosphorus condensation recovery device and a smoke overpressure protection device, wherein the smoke overpressure protection device is used for receiving yellow phosphorus smoke output by the smoke filtering and dust removing device, bypassing the smoke airflow driving device through a bypass when the air pressure of the yellow phosphorus smoke reaches a set threshold value, guiding the yellow phosphorus smoke to a diffusing tower or the yellow phosphorus condensation recovery device, and cutting off the bypass when the air pressure of the yellow phosphorus smoke does not reach the set threshold value; the smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the water seal groove, and the upper space of the liquid level in the water seal groove is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline.

Description

Yellow phosphorus fume purification system and industrial kiln fume purification device

Technical Field

The embodiments of the present application relate to the field of flue gas purification technology, and in particular to a yellow phosphorus flue gas purification system, an industrial kiln flue gas purification device, a flue gas pretreatment device, a flue gas filtration and dust removal device, a flue gas filtration and dust removal equipment, and a filter element regeneration method for a flue gas filtration and dust removal equipment.

Background technique

Yellow phosphorus is an extremely important basic industrial raw material, mainly used in many fields such as chemical industry, pesticide, and military. In particular, the current increase in demand for lithium iron phosphate batteries has further driven the increase in demand for yellow phosphorus.

The applicant of this application has been actively developing and promoting the application of yellow phosphorus green production technology in recent years. The applicant disclosed the main technical ideas of its yellow phosphorus green production technology for the first time in the patent documents with announcement numbers CN103523762B and CN103508429B, that is, the yellow phosphorus flue gas discharged from the phosphorus furnace is filtered and dusted by a flue gas filtration and dust removal device (the flue gas filtration and dust removal device physically intercepts the dust in the yellow phosphorus flue gas through a filter element), the temperature in the flue gas filtration and dust removal device can maintain the yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, so the yellow phosphorus is in a gaseous state, and the dust content of the yellow phosphorus flue gas can be reduced to less than 10-20 mg per standard square by filtering and dust removal, and then the yellow phosphorus flue gas is condensed, thereby greatly reducing the generation of mud phosphorus and sewage, and it is expected to fundamentally solve the high pollution problem of yellow phosphorus production.

As the applicant promotes and implements its yellow phosphorus green production process in yellow phosphorus manufacturers, the applicant is also constantly updating and iterating relevant technologies based on on-site conditions. In this process, new demands or problems are often encountered.

For example, the applicant disclosed a safety auxiliary device for a yellow phosphorus production system in a patent document with announcement number CN205023857U. In order to solve the problem that the internal pressure of the phosphorus furnace suddenly increases and the blower or induced draft fan of the filtration system cannot quickly increase the frequency to absorb a large amount of yellow phosphorus flue gas, resulting in flames in the phosphorus furnace, a water seal pressure relief system is added between the furnace gas inlet pipe and the washing tower (belonging to the yellow phosphorus condensation recovery device) of the phosphorus furnace in parallel with the filtration system. However, the above-mentioned water seal pressure relief system is mainly set to prevent the phosphorus furnace from spitting fire due to the increase in pressure, that is, it is mainly set for the purpose of protecting the phosphorus furnace. When the pressure of the phosphorus furnace increases and causes the air pressure in the flue gas filtration and dust removal device in the filtration system to increase, the water seal pressure relief system does not respond promptly to the pressure relief demand of the flue gas filtration and dust removal device. Therefore, the above-mentioned safety auxiliary device for the yellow phosphorus production system is not effective in protecting the flue gas filtration and dust removal device.

For another example, the applicant disclosed a yellow phosphorus flue gas purification system in the patent document with the announcement number CN203513281U. The yellow phosphorus flue gas discharged from the phosphorus furnace needs to be heated and insulated before dust removal to prevent the precipitation of liquid yellow phosphorus. The following scheme is specifically provided: the phosphorus furnace is connected to the furnace gas dust collection system through a smoke exhaust pipe, and the smoke exhaust pipe has a gas rising section and a gas descending section connected to each other. The inlet of the gas rising section is connected to the phosphorus furnace, and the outlet of the gas descending section is connected to the furnace gas dust collection system. An electric heater is installed at the end of the gas rising section, and the starting end of the gas descending section is connected to the side of the end of the gas rising section. When working, the yellow phosphorus flue gas from the phosphorus furnace first flows from bottom to top in the gas rising section, reaches the end of the pipe section, and fully exchanges heat with the electric heater, and then changes direction to enter the starting end of the gas descending section. The dust particles in the airflow hit the pipe wall under inertia, and then settle with the airflow. The above-mentioned smoke exhaust pipe is mainly designed for the purpose of improving heat exchange efficiency and promoting dust sedimentation. Based on the actual situation, the inventor of this application found that due to the high dust content in the yellow phosphorus flue gas, dust will gradually adhere to the heating tube of the electric heater, which will affect the heat exchange efficiency. In addition, the above patent deliberately installs the electric heater at the end of the gas ascending section so that it can fully contact with the airflow. However, due to the high heating temperature of the electric heater, it is easy to promote the conversion of yellow phosphorus into red phosphorus, thereby reducing the yield of yellow phosphorus.

For example, the applicant disclosed a dust discharge device and a dust discharge method in the patent document with publication number CN111359335A. In view of the fact that yellow phosphorus vapor is inevitably mixed into the dust intercepted by the dust removal device, and yellow phosphorus is a phase-change material with the risk of combustion and explosion, and it is highly dangerous to directly discharge the dust entrained with yellow phosphorus vapor, a two-stage dust discharge method is designed, that is, the dust is first discharged into the intermediate tank, and then the replacement gas is input into the intermediate tank to replace the yellow phosphorus vapor in the dust, and then the dust in the intermediate tank is discharged. However, the two-stage dust discharge requires the installation of multiple valves, and these valves and other related equipment need to be controlled in linkage during the dust discharge. Therefore, the working stability requirements of these valves and related equipment are relatively high. Once some equipment fails, it will lead to the inability to discharge dust. In short, the structure of the above-mentioned dust discharge device is relatively complex. When applied to the yellow phosphorus flue gas purification system, the working stability margin can be further improved.

For another example, the applicant disclosed a method for regenerating a gas filter element in the patent document with publication number CN104645732A. In view of the problem that the filter holes on the surface of the filter element in the flue gas filtration and dust removal device are blocked and the conventional back-blowing and cleaning are difficult to effectively restore the filtration flux, it is proposed that after the flue gas filtration and dust removal device is stopped, a mixed combustion-supporting gas containing 0.01% to 1.99% oxygen by volume and the rest being nitrogen is introduced into the flue gas filtration and dust removal device, so that all the filter elements in the flue gas filtration and dust removal device are placed therein as a whole, and at a set temperature of 100°C to 900°C, the combustion-supporting gas and impurities such as dust, tar and/or yellow phosphorus deposited on the surface of the filter element undergo a controlled combustion oxidation reaction, and the gas after the oxidation reaction is discharged through the exhaust structure. However, this regeneration method requires that combustion be triggered in the flue gas filtration and dust removal device and high temperature be generated, so higher high temperature resistance performance requirements are placed on the flue gas filtration and dust removal device and its filter element, which will increase the implementation cost.

Summary of the invention

In view of at least one of the above technical problems, the following solution is proposed.

In the first aspect, a yellow phosphorus fume purification system is provided, comprising: a fume overpressure protection device for receiving yellow phosphorus fume discharged from a phosphorus furnace, and directing the yellow phosphorus fume to a discharge tower or a yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus fume reaches a set threshold, and directing the yellow phosphorus fume to a fume filtration and dust removal device when the air pressure of the yellow phosphorus fume does not reach the set threshold; a fume filtration and dust removal device for receiving the yellow phosphorus fume from the fume overpressure protection device, and physically intercepting dust in the yellow phosphorus fume through a filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus fume is still in a gaseous state, and then outputting the yellow phosphorus fume purified by filtration and dust removal; a yellow phosphorus condensation recovery device for receiving the yellow phosphorus fume from the fume filtration and dust removal device, and transmitting the yellow phosphorus fume to a condensation recovery device through a cold The cooling medium directly or indirectly condenses the yellow phosphorus flue gas, so that the yellow phosphorus is converted from gas to liquid and then stored in the yellow phosphorus tank, and the tail gas is output at the same time; wherein, the flue gas overpressure protection device comprises a cylindrical container, one side opening of the cylindrical container is connected to the phosphorus furnace through a first vertical inclined pipe, and the other side opening is connected to the flue gas filtering and dust removal device through a second vertical inclined pipe, and the bottom opening is inserted below the liquid surface of the water seal tank; the water seal tank has a closed space and an open space constituting a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid surface of the closed space, and the upper space of the liquid surface of the closed space in the water seal tank is connected to the discharge tower or the yellow phosphorus condensation recovery device through a pipeline.

In the second aspect, an industrial furnace flue gas purification device is provided, comprising: a flue gas overpressure protection device for receiving flue gas discharged from the industrial furnace, and directing the flue gas to a discharge tower or a subsequent device of a flue gas filtering and dust removal device when the gas pressure of the flue gas reaches a set threshold, and directing the flue gas to a flue gas filtering and dust removal device when the set threshold is not reached; and a flue gas filtering and dust removal device for receiving the flue gas from the flue gas overpressure protection device, and physically intercepting the dust in the flue gas through a filter element, and then outputting the flue gas purified by filtering and dust removal; wherein the flue gas overpressure protection device comprises a cylindrical container, one side opening of the cylindrical container is connected to the industrial furnace through a pipeline, the other side opening is connected to the flue gas filtering and dust removal device through a pipeline, and the bottom opening is inserted below the liquid level of a liquid sealing tank; the liquid sealing tank has a closed space and an open space constituting a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid sealing tank is connected to the discharge tower or the subsequent device of the flue gas filtering and dust removal device through a pipeline.

The yellow phosphorus fume purification system of the first aspect and the industrial kiln fume purification device of the second aspect are both provided with a similar fume overpressure protection device before the fume filtration and dust removal device. Since the function of the fume overpressure protection device is to direct the fume to be filtered and dusted to the discharge tower or the subsequent equipment of the fume filtration and dust removal device when the air pressure of the fume to be filtered and dusted reaches a set threshold, and to direct it to the fume filtration and dust removal device when it does not reach the set threshold, therefore, when the air pressure of the industrial kiln suddenly increases, the fume filtration and dust removal device can be better protected by the fume overpressure protection device, and the equipment damage of the fume filtration and dust removal device due to the increase of air pressure can be effectively avoided. The cylindrical container in the fume overpressure protection device has a certain buffering effect, which helps to reduce the pressure fluctuation of the fume filtration and dust removal device. Since the liquid sealing tank has a closed space and an open space that constitute a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level in the closed space, and the upper space of the liquid level in the closed space in the liquid sealing tank is connected to the subsequent equipment of the discharge tower or the flue gas filtering and dust removal device through a pipeline. Therefore, when the air pressure in the upper space increases during the pressure relief process of the flue gas overpressure protection device, the liquid level in the closed space can be pushed down and the liquid level in the open space can be pushed up, thereby preventing the pressure in the upper space from being too high and increasing the corresponding pressure relief rate.

In a third aspect, a yellow phosphorus fume purification system is provided, comprising: a fume filtering and dust removal device, for receiving the yellow phosphorus fume discharged from the phosphorus furnace, and physically intercepting the dust in the yellow phosphorus fume through a filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus fume is still in a gaseous state, and then outputting the yellow phosphorus fume purified after filtering and dust removal; a fume airflow driving device, for receiving the yellow phosphorus fume outputted from the fume filtering and dust removal device, and after increasing the pressure of the yellow phosphorus fume through mechanical energy, discharging the pressurized yellow phosphorus fume; a yellow phosphorus condensation recovery device, for receiving the yellow phosphorus fume from the fume airflow driving device, and directly or indirectly cooling the yellow phosphorus fume through a cooling medium. Condensation causes yellow phosphorus to be converted from gaseous state to liquid state and then stored in the yellow phosphorus tank, while outputting tail gas; a flue gas overpressure protection device is used to receive the yellow phosphorus flue gas output by the flue gas filtering and dust removal device, and to bypass the flue gas airflow driving device through a bypass to guide the yellow phosphorus flue gas to a discharge tower or a yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus flue gas reaches a set threshold, and to cut off the bypass when the set threshold is not reached; wherein, the flue gas overpressure protection device comprises a drainage pipe, one end of the drainage pipe is connected to the flue gas filtering and dust removal device, and the other end is inserted below the liquid surface of the water seal tank, and the upper space of the liquid surface in the water seal tank is connected to the discharge tower or the yellow phosphorus condensation recovery device through a pipeline.

In a fourth aspect, an industrial kiln flue gas purification device is provided, comprising: a flue gas filtering and dust removal device for receiving flue gas emitted from an industrial kiln, and physically intercepting dust in the flue gas through a filter element, and then outputting the flue gas after filtering and dust removal and purification; a flue gas airflow driving device for receiving the flue gas output from the flue gas filtering and dust removal device, and after increasing the pressure of the yellow phosphorus flue gas through mechanical energy, discharging the pressurized yellow phosphorus flue gas; a flue gas overpressure protection device for receiving the flue gas from the flue gas filtering and dust removal device, and bypassing the flue gas airflow driving device through a bypass to guide the flue gas to a discharge tower or a subsequent device of the flue gas airflow driving device when the air pressure of the flue gas reaches a set threshold, and cutting off the bypass when the set threshold is not reached; wherein the flue gas overpressure protection device comprises a drainage pipe, one end of which is connected to the flue gas filtering and dust removal device, and the other end is inserted below the liquid surface of the liquid sealing tank, and the upper space of the liquid surface in the liquid sealing tank is connected to the discharge tower or the subsequent device of the flue gas airflow driving device through a pipeline.

The yellow phosphorus fume purification system of the third aspect and the industrial furnace fume purification device of the fourth aspect connect the fume overpressure protection device and the fume airflow driving device in parallel after the fume filtration and dust removal device. When the air pressure of the industrial furnace suddenly rises, the fume overpressure protection device can bypass the fume airflow driving device and guide the fume to the discharge tower or the subsequent equipment of the fume airflow driving device, so as to prevent the fume airflow driving device from being unable to quickly increase the frequency, resulting in the problem that the air pressure of the fume filtration and dust removal device cannot be quickly relieved. At the same time, since the fume overpressure protection device is arranged after the fume filtration and dust removal device, the dust content of the airflow relieved by the fume overpressure protection device is very low, reducing air pollution or the impact on the subsequent equipment of the fume airflow driving device.

In a fifth aspect, an industrial kiln flue gas purification device is provided, comprising: a flue gas pretreatment device for receiving flue gas emitted from an industrial kiln, pretreating the flue gas, and then outputting the pretreated flue gas; a flue gas filtering and dust removal device for receiving flue gas from the flue gas pretreatment device, physically intercepting dust in the flue gas through a filter element, and then outputting the flue gas purified by filtration and dust removal; wherein the flue gas pretreatment device comprises an airflow buffer, the airflow buffer having an air intake section, a variable diameter contraction section, a variable diameter expansion section and an exhaust section which are sequentially arranged according to the flow direction of the flue gas, the air intake section being used to receive the flue gas emitted from the industrial kiln, and the exhaust section being used to output the pretreated flue gas; in addition, the flue gas pretreatment device further comprises a heat exchanger, the heat exchanger being installed in the exhaust section and arranged opposite to the outlet of the variable diameter expansion section.

In a sixth aspect, a flue gas pretreatment device is provided for receiving flue gas emitted from an industrial kiln, pretreating the flue gas, and then outputting the pretreated flue gas to a flue gas filtering and dust removal device; comprising an airflow buffer, the airflow buffer having an air intake section, a variable diameter contraction section, a variable diameter expansion section and an exhaust section arranged in sequence according to the direction of flue gas flow, the air intake section being used to receive flue gas emitted from an industrial kiln, and the exhaust section being used to output the pretreated flue gas; in addition, the flue gas pretreatment device also comprises a heat exchanger, which is installed in the exhaust section and arranged opposite to the outlet of the variable diameter expansion section.

The industrial furnace flue gas purification device of the fifth aspect and the flue gas pretreatment device of the sixth aspect adopt an airflow buffer having an air intake section, a variable diameter contraction section, a variable diameter expansion section and an exhaust section arranged in sequence according to the direction of flue gas flow. When the airflow passes through the variable diameter contraction section and the variable diameter expansion section, the flow velocity is increased by the Venturi effect, so that the problem of reduced heat exchange efficiency caused by pollutants such as dust attached to the heat exchanger (electric heater) can be alleviated. In addition, due to the increase in airflow velocity, the time for the airflow to pass through the heat exchanger (electric heater) becomes shorter, which can prevent the occurrence of similar situations such as yellow phosphorus being converted into red phosphorus.

In a seventh aspect, a yellow phosphorus fume purification system is provided, comprising: a fume filtration and dust removal device for receiving yellow phosphorus fume discharged from a phosphorus furnace, and physically intercepting dust in the yellow phosphorus fume through a filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus fume is still in a gaseous state, and then outputting the yellow phosphorus fume purified by filtration and dust removal; a yellow phosphorus condensation recovery device for receiving the yellow phosphorus fume from the fume filtration and dust removal device, and directly or indirectly condensing the yellow phosphorus fume through a cooling medium, so that the yellow phosphorus is converted from a gaseous state to a liquid state and then stored in a yellow phosphorus tank, and at the same time outputting tail gas; wherein the fume is The filtering and dust removal device includes a dust collector cylinder, the filter element is installed in the dust collector cylinder through a filter element mounting plate and the dust collector cylinder is divided into a lower raw air chamber and an upper clean air chamber, the raw air chamber is provided with an air inlet for receiving the yellow phosphorus flue gas discharged from the phosphorus furnace, the clean air chamber is provided with an exhaust port for outputting the yellow phosphorus flue gas after filtering and dust removal and purification, and the bottom of the dust collector cylinder is provided with a discharge channel communicating with the raw air chamber; in addition, the flue gas filtering and dust removal device also includes a water seal groove, the bottom opening of the discharge channel is inserted below the liquid surface of the water seal groove, and the bottom of the water seal groove is provided with a discharge structure.

In an eighth aspect, a flue gas filtering and dust removal device is provided, comprising: a flue gas filtering and dust removal device for receiving flue gas emitted by an industrial kiln, and physically intercepting dust in the flue gas through a filter element, and then outputting the flue gas purified by filtration and dust removal; wherein the flue gas filtering and dust removal device comprises a dust collector cylinder, the filter element is installed in the dust collector cylinder through a filter element mounting plate and divides the dust collector cylinder into a lower original air chamber and an upper clean air chamber, the original air chamber is provided with an air inlet for receiving yellow phosphorus flue gas emitted by a phosphorus furnace, the clean air chamber is provided with an exhaust port for outputting yellow phosphorus flue gas purified by filtration and dust removal, and the bottom of the dust collector cylinder is provided with a discharge channel communicating with the original air chamber; in addition, the flue gas filtering and dust removal device further comprises a liquid seal tank, the discharge channel is inserted below the liquid surface of the liquid seal tank, and a discharge structure is provided at the bottom of the liquid seal tank.

The yellow phosphorus flue gas purification system of the seventh aspect and the flue gas filtration and dust removal device of the eighth aspect are designed to discharging yellow phosphorus flue gas dust and other dusts of similar nature, and the structure of inserting the discharge channel into the liquid seal tank (water seal tank in the case of yellow phosphorus flue gas dust) below the liquid surface is greatly simplified compared with the above two-stage ash discharge method. The dust discharged through the discharge channel can sink below the liquid surface, avoiding the yellow phosphorus carried in the dust from contacting with the air, and the dust and the condensed yellow phosphorus are then discharged through the discharge structure.

In the ninth aspect, a yellow phosphorus flue gas purification system is provided, comprising: a flue gas pretreatment device for receiving yellow phosphorus flue gas emitted from a phosphorus furnace, pre-treating the yellow phosphorus flue gas, and then outputting the pre-treated yellow phosphorus flue gas; a flue gas filtering and dust removal device for receiving the yellow phosphorus flue gas from the flue gas pretreatment device, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercepting the dust in the yellow phosphorus flue gas through a filter element, and then outputting the filtered and dust-purified yellow phosphorus flue gas; a yellow phosphorus condensation recovery device for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removal device, and directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium , so that the yellow phosphorus is converted from gas to liquid and then stored in the yellow phosphorus tank, and the exhaust gas is output at the same time; wherein, the flue gas pretreatment device includes an airflow buffer, the airflow buffer has an airflow buffer cylinder, an airflow buffer space is formed in the airflow buffer cylinder, the airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas discharged from the phosphorus furnace and an exhaust port for outputting the pretreated yellow phosphorus flue gas, and the bottom of the airflow buffer cylinder is provided with a discharge channel connected to the airflow buffer space; and the flue gas pretreatment device also includes a water seal groove, the bottom opening of the discharge channel is inserted below the liquid surface of the water seal groove, and the bottom of the water seal groove is provided with a discharge structure.

In the tenth aspect, a flue gas pretreatment device is provided for receiving flue gas emitted from an industrial kiln, pretreating the flue gas, and then outputting the pretreated flue gas to a flue gas filtering and dust removal device; comprising an airflow buffer, the airflow buffer having an airflow buffer cylinder, an airflow buffer space formed in the airflow buffer cylinder, the airflow buffer space being provided with an air inlet for receiving the flue gas emitted from the industrial kiln and an exhaust port for outputting the pretreated flue gas, the bottom of the airflow buffer cylinder being provided with a unloading channel communicating with the airflow buffer space; and the flue gas pretreatment device further comprises a liquid sealing groove, the unloading channel is inserted below the liquid surface of the liquid sealing groove, and a discharge structure is provided at the bottom of the liquid sealing groove.

Similarly, the yellow phosphorus flue gas purification system of the ninth aspect and the flue gas filtration and dust removal device of the tenth aspect are designed to discharging yellow phosphorus flue gas dust and other dusts of similar nature, and the structure of inserting the discharge channel into the liquid seal tank (water seal tank in the case of yellow phosphorus flue gas dust) is greatly simplified compared to the above two-stage ash discharge method. The dust discharged through the discharge channel can sink below the liquid surface, avoiding the yellow phosphorus carried in the dust from contacting with the air, and the dust and the condensed yellow phosphorus are discharged through the discharge structure.

In the eleventh aspect, a flue gas filtering and dust removal device is provided, comprising: a dust collector cylinder, used to provide a shell of the flue gas filtering and dust removal device; a filter element, which forms an original air chamber and a clean air chamber after being installed in the dust collector cylinder; an air intake structure, which is arranged on the dust collector cylinder and is connected to the original air chamber; an exhaust structure, which is arranged on the dust collector cylinder and is connected to the clean air chamber; an ash discharge structure, which is arranged at the bottom of the dust collector cylinder and is connected to the lower part of the original air chamber; a filter element regeneration liquid cleaning structure, which is used to provide the filter element with regeneration liquid that can clean pollutants on the filter element; a regeneration liquid discharge structure, which is arranged at the bottom of the dust collector cylinder and is connected to the lower part of the original air chamber; and a dust collector drying structure, which is used to dry the inside of the dust collector cylinder.

In a twelfth aspect, a method for regenerating a filter element of a flue gas filtering and dust removal device is provided, which adopts the flue gas filtering and dust removal device of the eleventh aspect and includes: closing the air intake structure; providing the regeneration liquid to the filter element through the filter element regeneration liquid cleaning structure; discharging the regeneration liquid from the dust collector cylinder through the regeneration liquid discharge structure; and drying the inside of the dust collector cylinder through the dust collector drying structure.

The filter element regeneration method of the flue gas filtration and dust removal equipment of the eleventh aspect and the flue gas filtration and dust removal equipment of the twelfth aspect creatively uses a regeneration liquid to clean the filter element of the flue gas filtration and dust removal equipment, and then dries the inside of the dust collector cylinder through the dust collector drying structure, so that the regeneration liquid will not remain inside the dust collector cylinder to affect the filtration and dust removal. This regeneration method is simpler and safer.

The present application is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through practice.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of this specification are used to assist in understanding the present application. The contents provided in the drawings and their related descriptions in this specification may be used to explain the present application, but do not constitute improper limitations on the present application.

FIG1 is a schematic structural diagram of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG2 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG3 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG4 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG5 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG6 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG. 7 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG8 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application.

FIG9 is a schematic diagram of the structure of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

FIG10 is a schematic diagram of the structure of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

FIG. 11 is a schematic diagram of the structure of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

FIG. 12 is an engineering structure diagram of a flue gas pretreatment device according to an embodiment of the present application.

Detailed ways

The present application is described clearly and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present application based on these descriptions. Before describing the present application in conjunction with the accompanying drawings, it should be noted that:

The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

The embodiments of the present application involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

The applicant disclosed for the first time in the patent documents with announcement numbers CN103523762B and CN103508429B the main technical ideas of its green production process of yellow phosphorus, namely, using a flue gas filtration and dust removal device to filter and remove dust from the yellow phosphorus flue gas discharged from the phosphorus furnace. The flue gas filtration and dust removal device physically intercepts the dust in the yellow phosphorus flue gas through a filter element. During this process, the temperature in the flue gas filtration and dust removal device can maintain the yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, so the yellow phosphorus is in a gaseous state. By filtering and dust removal, the dust content of the yellow phosphorus flue gas can be reduced to less than 10-20 mg per standard cubic meter (even to less than 5-10 mg per standard cubic meter), and then the yellow phosphorus flue gas is condensed, thereby greatly reducing the generation of mud phosphorus and sewage, which is expected to fundamentally solve the high pollution problem of yellow phosphorus production.

Since the temperature in the flue gas filtration and dust removal device can maintain the yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, this flue gas filtration and dust removal device can also be called a high-temperature flue gas filtration and dust removal device. The core is that the filter material used in the filter element can withstand higher temperatures (the recommended temperature range is given in CN103523762B and CN103508429B, which will not be repeated here), while ensuring higher filtration efficiency and filtration flux. The filtration effect can be characterized by the dust content of the yellow phosphorus flue gas after filtration and dust removal, and the filtration flux can be characterized by the volume of gas filtered per unit filtration area per unit time.

During the use of the filter element, dust will adhere to the filter surface of the filter element, so the filtration flux will gradually decrease. The conventional method is to back-blow the filter element to clean it. Back-blow cleaning is a traditional technology for flue gas filters. Usually, a blowpipe can be used to back-blow the air outlet of each filter element. In addition to back-blow cleaning of the filter element, when the filter element is seriously polluted and back-blow cleaning cannot effectively restore the filtration flux, the filter element can be regenerated. The specific regeneration method will be explained later.

Due to the setting of the flue gas filtration and dust removal device, a series of specific problems are brought about accordingly, such as how to reduce the impact of the flue gas filtration and dust removal device on the yellow phosphorus production process, how to realize the ash unloading of the flue gas filtration and dust removal device, how to control the temperature of the yellow phosphorus flue gas about to enter the flue gas filtration and dust removal device, and how to regenerate the filter element of the flue gas filtration and dust removal device. Relevant technologies have been formed to address these specific problems.

As the applicant goes deeper into yellow phosphorus manufacturers to promote and implement its yellow phosphorus green production process, the applicant is also constantly updating and iterating relevant technologies based on on-site conditions. Therefore, the applicant has successively submitted patent applications with publication numbers/announcement numbers CN205023857U, CN203513281U, CN111359335A, CN104645732A, etc.

CN205023857U discloses a safety auxiliary device for a yellow phosphorus production system. In order to solve the problem that the internal pressure of the phosphorus furnace suddenly increases and the blower or induced draft fan of the filtration system cannot quickly increase the frequency to absorb a large amount of yellow phosphorus smoke, resulting in flames in the phosphorus furnace, a water seal pressure relief system is added between the furnace gas inlet pipe of the phosphorus furnace and the washing tower (belonging to the yellow phosphorus condensation recovery device) arranged in parallel with the filtration system.

However, the water seal pressure relief system is mainly set up to prevent the phosphorus furnace from spitting fire due to the increase of pressure, that is, it is mainly set up for the purpose of protecting the phosphorus furnace. When the pressure of the phosphorus furnace increases and causes the air pressure in the flue gas filtration and dust removal device in the filtration system to increase, the water seal pressure relief system does not respond promptly to the pressure relief demand of the flue gas filtration and dust removal device. Therefore, the safety auxiliary device of the yellow phosphorus production system is not effective in protecting the flue gas filtration and dust removal device.

CN203513281U discloses a yellow phosphorus flue gas purification system, which requires heating and heat preservation before dust removal to prevent the precipitation of liquid yellow phosphorus in the yellow phosphorus flue gas discharged from the phosphorus furnace, and specifically provides the following scheme: the phosphorus furnace is connected to the furnace gas dust collection system through a smoke exhaust pipe, and the smoke exhaust pipe has a gas ascending section and a gas descending section connected to each other, the inlet of the gas ascending section is connected to the phosphorus furnace, and the outlet of the gas descending section is connected to the furnace gas dust collection system, and an electric heater is installed at the end pipe section of the gas ascending section, and the starting end of the gas descending section is connected to the side of the end pipe section of the gas ascending section. During operation, the yellow phosphorus flue gas from the phosphorus furnace first flows from bottom to top in the gas ascending section, reaches the end pipe section to fully exchange heat with the electric heater, and then changes direction to enter the starting end of the gas descending section, and the dust particles in the airflow hit the pipe wall under inertia, thereby settling with the airflow.

The above-mentioned smoke exhaust duct is mainly designed for the purpose of improving heat exchange efficiency and promoting dust settling. Based on the actual situation, the inventor of this application found that due to the high dust content in the yellow phosphorus flue gas, dust will gradually adhere to the heating tube of the electric heater, which will affect the heat exchange efficiency. In addition, the above-mentioned patent deliberately installs the electric heater at the end of the gas ascending section so that it can fully contact with the airflow. However, due to the high heating temperature of the electric heater, it is easy to promote the conversion of yellow phosphorus into red phosphorus, thereby reducing the yield of yellow phosphorus.

CN111359335A discloses an ash discharge device and an ash discharge method. In view of the problem that yellow phosphorus vapor is inevitably mixed into the dust intercepted by the dust removal device, and yellow phosphorus is a phase-change material with the risk of combustion and explosion, and it is highly dangerous to directly discharge the dust entrained with yellow phosphorus vapor, a two-stage ash discharge method is designed, that is, the dust is first discharged into an intermediate tank, and then a replacement gas is input into the intermediate tank to replace the yellow phosphorus vapor in the dust, and then the dust in the intermediate tank is discharged.

However, two-stage ash discharge requires the installation of multiple valves, and these valves and other related equipment need to be controlled in linkage during ash discharge. Therefore, the working stability of these valves and related equipment is required to be high. Once some equipment fails, it will lead to failure of ash discharge. In short, the structure of the above-mentioned ash discharge device is relatively complex. When applied to the yellow phosphorus flue gas purification system, the working stability margin can be further improved.

CN104645732A discloses a method for regenerating a gas filter element. Aiming at the problem that the filter holes on the surface of the filter element in the flue gas filtering and dust removal device are blocked and the conventional back-blowing and cleaning are difficult to effectively restore the filtration flux, it is proposed that after the flue gas filtering and dust removal device is stopped, a mixed combustion-supporting gas containing oxygen in a volume ratio of 0.01% to 1.99% and the rest being nitrogen is introduced into the flue gas filtering and dust removal device, so that all the filter elements in the flue gas filtering and dust removal device are placed in the mixed combustion-supporting gas as a whole, and at a set temperature of 100°C to 900°C, the combustion-supporting gas and impurities such as dust, tar and/or yellow phosphorus deposited on the surface of the filter element undergo a controllable combustion oxidation reaction, and the gas after the oxidation reaction is discharged through an exhaust structure.

However, the above regeneration method requires triggering combustion and generating high temperature in the flue gas filtration and dust removal device, which places higher requirements on the high temperature resistance of the flue gas filtration and dust removal device and its filter element, thereby increasing the implementation cost.

The following introduces relevant embodiments of the present application. When these embodiments are implemented individually, they can solve at least one of the above-mentioned technical problems, and when implemented in combination, they can solve two or more of the above-mentioned technical problems.

Fig. 1 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. As shown in Fig. 1, the yellow phosphorus fume purification system comprises: a fume overpressure protection device 200, a fume pretreatment device 300, a fume filtration and dust removal device 400, a fume airflow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas overpressure protection device 200 is used to receive the yellow phosphorus flue gas discharged from the phosphorus furnace 100, and guide the yellow phosphorus flue gas to a discharge tower (not shown in the figure) or a yellow phosphorus condensation recovery device 600 when the pressure of the yellow phosphorus flue gas reaches a set threshold, and guide it to the flue gas pretreatment device 300 when the pressure of the yellow phosphorus flue gas does not reach the set threshold.

The flue gas pretreatment device 300 is arranged between the flue gas overpressure protection device 200 and the flue gas filtering and dust removal device 400, and is used to receive the yellow phosphorus flue gas from the flue gas overpressure protection device 200, pretreat the yellow phosphorus flue gas, and then output the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removal device 400 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercept the dust in the yellow phosphorus flue gas through the filter element 410, and then output the filtered and dust-removed purified yellow phosphorus flue gas.

The flue gas flow driving device 500 (generally a fan) is used to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removal device 400, and after increasing the pressure of the yellow phosphorus flue gas by mechanical energy, discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used to receive the yellow phosphorus flue gas from the flue gas flow driving device 500, and directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from gas to liquid and stored in the yellow phosphorus tank 610, while outputting the tail gas.

Among them, the flue gas overpressure protection device 200 includes a cylindrical container 210, one side opening of the cylindrical container 210 is connected to the phosphorus furnace 100 through a first vertically inclined tube 220, and the other side opening is connected to the flue gas pretreatment device 300 through a second vertically inclined tube 230, and the bottom opening is inserted below the liquid surface of the water seal tank 240.

As shown in Figures 9-10, the water seal tank 240 has a closed space 241 and an open space 242 that constitute a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid surface of the closed space 241 (the insertion depth below the liquid surface is adapted to the above-mentioned set threshold), and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The flue gas pretreatment device 300 includes an airflow buffer, which has an airflow buffer cylinder 310. An airflow buffer space is formed inside the airflow buffer cylinder 310. The airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an exhaust port for outputting the pretreated yellow phosphorus flue gas.

The above-mentioned yellow phosphorus flue gas purification system is provided with a flue gas overpressure protection device 200 before the flue gas filtering and dust removal device 400. Since the function of the flue gas overpressure protection device 200 is to guide the yellow phosphorus flue gas discharged from the phosphorus furnace 100 to the emission tower or the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus flue gas reaches the set threshold, and to guide it to the flue gas filtering and dust removal device 400 after passing through the flue gas pretreatment device 300 when it does not reach the set threshold, therefore, when the air pressure of the phosphorus furnace 100 suddenly increases, the flue gas filtering and dust removal device 400 can be better protected by the flue gas overpressure protection device 200, effectively avoiding the damage of the flue gas filtering and dust removal device 400 due to the sudden increase in air pressure, especially the damage of the filter element.

The filter element used by the applicant before the application of CN103523762B and CN103508429B can be called a "rigid filter element". This filter element has high strength and high temperature resistance, but the manufacturing cost is also high. Later, the applicant developed a flexible membrane filter element, which uses a flexible metal film to make a structure similar to a cloth bag. It is not only resistant to high temperatures, but also has significantly reduced manufacturing costs. The strength of this filter element is not as high as that of a rigid filter element. When using the above-mentioned flue gas overpressure protection device 200, it is obviously more appropriate to use a flexible membrane filter element with lower cost.

The cylindrical container 210 in the flue gas overpressure protection device 200 has a certain buffering effect, which helps to reduce the pressure fluctuation of the flue gas filtering and dust removal device 400.

Since the water seal groove 240 has a closed space 241 and an open space 242 that constitute a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid level of the closed space 241, and the upper space of the liquid level of the closed space in the water seal groove 240 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipeline 250. Therefore, when the air pressure in the upper space increases during the pressure relief process of the flue gas overpressure protection device 200, the liquid level in the closed space 241 can be pushed down and the liquid level in the open space 242 can be pushed up (see Figure 10), thereby preventing the pressure in the upper space from being too high and increasing the corresponding pressure relief rate.

Therefore, the structure of the flue gas overpressure protection device 200 also helps to minimize the impact on the flue gas filtering and dust removal device 400 when the gas pressure in the phosphorus furnace 100 suddenly increases.

As shown in Figs. 9-10, the water seal tank 240 has a lower tank body and an upper tank body, the upper tank body is installed in the lower tank body in an inverted manner through a connector connected between the lower tank body and the upper tank body, and a bottom channel and a side channel are reserved between the upper tank body and the lower tank body, so that the closed space is formed between the interior of the upper tank body and the bottom channel, and the open space 242 is formed in the side channel. In addition, the water seal tank 240 is provided with an overflow port connected to the upper part of the open space 242, and overflow is achieved when the liquid level in the open space 242 rises to the overflow port.

Here, at least one function of the flue gas pretreatment device 300 is to further reduce the impact of the pressure fluctuation of the phosphorus furnace 100 on the flue gas filtering and dust removal device 400 through the buffering effect of the airflow buffer, and to protect the phosphorus furnace 100 and reduce its operating safety hazards. During the operation of the phosphorus furnace 100, negative pressure may be generated due to the sudden collapse of the furnace charge (the phosphorus furnace 100 is specifically an electric furnace). Due to the negative pressure, air may be sucked into the phosphorus furnace 100 and contact with yellow phosphorus to cause an explosion. Therefore, the airflow buffer can actually provide negative pressure protection for the phosphorus furnace 100, thereby cooperating with the flue gas overpressure protection device 200.

The flue gas pretreatment device 300 generally has another function, namely, mechanical pre-dust removal of yellow phosphorus flue gas. For example, large particles of dust in the yellow phosphorus flue gas are removed by natural principles such as gravity sedimentation and inertial separation. Therefore, from the perspective of mechanical pre-dust removal, the flue gas pretreatment device 300 can also be called a mechanical dust collector.

The flue gas pretreatment device 300 can use a variety of different structures to achieve mechanical pre-dust removal. A simple implementation method is to directly use the airflow buffer cylinder 310 to achieve gravitational sedimentation of dust. In other embodiments, mechanical pre-dust removal can also be achieved by referring to the relevant structures of mechanical dust collectors such as gravity dust collectors, inertial dust collectors, and cyclone dust collectors. The bottom of the flue gas pretreatment device 300 is usually also provided with a discharge channel 330 for discharging dust.

The flue gas pretreatment device 300 may also be provided with a heat exchanger to heat the yellow phosphorus flue gas, so as to prevent the yellow phosphorus flue gas from being cooled before passing through the flue gas filtration and dust removal device 400, thereby preventing the yellow phosphorus and dust from being attached to the inside of the flue gas filtration and dust removal device 400 and the inner wall of the related pipeline, causing blockage. In an optional embodiment, the heat exchanger is specifically an electric heater 320.

Typically, the flue gas filtering and dust removal device 400 includes a dust collector cylinder 420, the filter element 410 is installed in the dust collector cylinder 420 through a filter element mounting plate 430 and divides the dust collector cylinder into a lower original air chamber 440 and an upper clean air chamber 450, the original air chamber 440 is provided with an air inlet for receiving the yellow phosphorus flue gas to be filtered, dust-removed and purified, the clean air chamber 450 is provided with an exhaust port for outputting the yellow phosphorus flue gas after filtering, dust-removing and purification, and the bottom of the dust collector cylinder 420 is provided with a discharge channel 460 communicating with the original air chamber 440.

In addition, generally speaking, the flue gas filtering and dust removal device 400 also includes a filter element back-blowing and dust cleaning structure 470, which is used to apply compressed gas from the clean air chamber 450 to the filter element 410 in a direction opposite to the filtering direction. Here, the compressed gas is usually nitrogen.

In a common implementation, the filter element back-blowing cleaning structure 470 comprises a compressed gas delivery pipe 471, a portion of which is located in the clean air chamber 450 in the dust collector barrel 420 and is provided with a spray port corresponding to the output port of the filter element 410; another portion of the compressed gas delivery pipe 471 is located outside the dust collector barrel 420 and is connected to a compressed gas source through a first control valve 472. The compressed gas source may be an air bag 473.

In other embodiments, the filter element backflushing and cleaning structure 470 may also use backflushing techniques such as venturi backflushing.

In a typical implementation, the yellow phosphorus condensation recovery device 600 uses more than two spray towers 620 that can be connected in parallel or in series. These spray towers 620 directly spray cooling water of a certain temperature onto the yellow phosphorus flue gas, so that the yellow phosphorus is converted from gas to liquid and then stored in the yellow phosphorus tank 610, while outputting the exhaust gas at the same time.

In a preferred embodiment, the yellow phosphorus condensation recovery device 600 comprises M spray towers connected in series, where M is an integer ≥2; and, when the gas pressure of the yellow phosphorus flue gas reaches a set threshold, the flue gas overpressure protection device 200 guides the yellow phosphorus flue gas to the Nth positive spray tower in the yellow phosphorus condensation recovery device 600 in the direction of the yellow phosphorus flue gas flow, where N is an integer ≥2 and ≤M.

In the above preferred embodiment, since the M spray towers are connected in series, the overall yield of yellow phosphorus in these spray towers is high, and the yellow phosphorus content in the tail gas is very low. In addition, since the flue gas overpressure protection device 200 guides the yellow phosphorus flue gas to the Nth positive spray tower in the yellow phosphorus condensation recovery device 600 according to the flow direction of the yellow phosphorus flue gas when the air pressure of the yellow phosphorus flue gas reaches the set threshold, and N is an integer ≥2 and ≤M, in this way, it is possible to avoid a large back pressure in the first spray tower and affect the normal operation of the flue gas filtering and dust removal device 400, so as to facilitate faster pressure relief of the yellow phosphorus condensation recovery device 600.

In other embodiments, the yellow phosphorus condensation recovery device 600 can use a dedicated phosphorus collection device such as provided in the patent document with publication number CN103708432B applied by the applicant to indirectly condense and recover the yellow phosphorus.

Since impurities such as solid slag and yellow phosphorus will gradually be generated in the water seal groove 240 of the flue gas overpressure protection device 200, these impurities will gather at the bottom of the water seal groove 240. Therefore, a discharge structure can be set at the bottom of the water seal groove 240 to discharge the impurities such as solid slag and yellow phosphorus from the bottom of the water seal groove 240.

In one embodiment, the bottom of the water seal tank 240 is provided with a certain slope, and a discharge port is provided at the lowest point, and the discharge port is connected to the middle tank 260 through a pipeline, so that impurities can be discharged into the middle tank 260 through the discharge port. Hot water is stored in the middle tank, which can keep the yellow phosphorus in a liquid state so as to transport the yellow phosphorus to the yellow phosphorus refining process.

The above-mentioned flue gas pretreatment device 300 and flue gas filtering and dust removal device 400 both adopt the ash discharge device and ash discharge method similar to those in CN111359335A, that is, the discharge channel 330 of the flue gas pretreatment device 300 and the discharge channel 460 of the flue gas filtering and dust removal device 400 are respectively connected to the intermediate ash tank 481 through the discharge valve, and the intermediate ash tank 481 is further connected to the storage tank 482 through the discharge valve. After the dust is discharged into the intermediate ash tank 481, a replacement gas (such as nitrogen) is introduced into the intermediate ash tank 481 to replace the yellow phosphorus vapor in the dust, and then the dust in the intermediate ash tank 481 is discharged into the storage tank 482.

The tail gas outputted by the yellow phosphorus condensation recovery device 600 contains a large amount of carbon monoxide, which is generally transported to a gas tank for storage for subsequent use. Another flue gas flow driving device (such as a water ring vacuum pump) can be provided between the yellow phosphorus condensation recovery device 600 and the gas tank to extract the tail gas. In the case where a flue gas flow driving device is provided after the yellow phosphorus condensation recovery device 600, the flue gas flow driving device 500 can be eliminated.

Fig. 2 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. As shown in Fig. 2, the yellow phosphorus fume purification system comprises: a fume overpressure protection device 200, a fume pretreatment device 300, a fume filtration and dust removal device 400, a fume airflow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the flue gas overpressure protection device 200 and the phosphorus furnace 100, and is used for receiving the yellow phosphorus flue gas discharged from the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and then outputting the pretreated yellow phosphorus flue gas.

The flue gas overpressure protection device 200 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300, and guide the yellow phosphorus flue gas to the discharge tower or the yellow phosphorus condensation recovery device 600 when the pressure of the yellow phosphorus flue gas reaches a set threshold, and guide it to the flue gas filtration and dust removal device 400 when the pressure of the yellow phosphorus flue gas does not reach the set threshold.

The flue gas filtering and dust removal device 400 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300 and through the flue gas overpressure protection device 200, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercept the dust in the yellow phosphorus flue gas through the filter element 410, and then output the filtered and dust-removed purified yellow phosphorus flue gas.

The flue gas flow driving device 500 is used to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removal device 400, and after increasing the pressure of the yellow phosphorus flue gas by mechanical energy, discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used to receive the yellow phosphorus flue gas from the flue gas flow driving device 500, and directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from gas to liquid and stored in the yellow phosphorus tank 610, while outputting the tail gas.

In which, the flue gas overpressure protection device 200 includes a cylindrical container 210, one side opening of the cylindrical container 210 is connected to the flue gas pretreatment device 300 through a first vertically inclined tube 220, and the other side opening is connected to the flue gas filtering and dust removal device 400 through a second vertically inclined tube 230, and the bottom opening is inserted below the liquid surface of the water seal tank 240.

The water seal tank 240 has a closed space 241 and an open space 242 that constitute a communicating vessel. The bottom opening of the cylindrical container 210 is inserted below the liquid surface of the closed space 241 (the depth of insertion below the liquid surface is adapted to the above-mentioned set threshold). The upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The flue gas pretreatment device 300 includes an airflow buffer, which has an airflow buffer cylinder 310. An airflow buffer space is formed in the airflow buffer cylinder 310. The airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the phosphorus furnace 100 and an exhaust port for outputting the pretreated yellow phosphorus flue gas.

The difference between the yellow phosphorus flue gas purification system shown in FIG2 and the yellow phosphorus flue gas purification system shown in FIG1 is that the relative positions of the flue gas pretreatment device 300 and the flue gas overpressure protection device 200 are interchanged. Since the flue gas pretreatment device 300 can usually perform mechanical pre-dust removal on the yellow phosphorus flue gas, the yellow phosphorus flue gas purification system shown in FIG2 helps to reduce the amount of solid slag generated in the water seal tank 240.

Fig. 3 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. As shown in Fig. 3, the yellow phosphorus fume purification system comprises: a fume overpressure protection device 200, a fume pretreatment device 300, a fume filtration and dust removal device 400, a fume airflow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the flue gas filtering and dust removal device 400 and the phosphorus furnace 100, and is used for receiving the yellow phosphorus flue gas emitted by the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and then outputting the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removal device 400 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercept the dust in the yellow phosphorus flue gas through the filter element 410, and then output the filtered and dust-removed purified yellow phosphorus flue gas.

The flue gas flow driving device 500 is used to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removal device 400, and after increasing the pressure of the yellow phosphorus flue gas by mechanical energy, discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used to receive the yellow phosphorus flue gas from the flue gas flow driving device 500, and directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from gas to liquid and stored in the yellow phosphorus tank 610, while outputting the tail gas.

The flue gas overpressure protection device 200 is used to receive the yellow phosphorus flue gas output by the flue gas filtering and dust removal device 400, and to bypass the flue gas airflow driving device 500 to guide the yellow phosphorus flue gas to the discharge tower or the yellow phosphorus condensation recovery device 600 through a bypass when the air pressure of the yellow phosphorus flue gas reaches a set threshold, and to cut off the bypass when the set threshold is not reached.

Among them, the flue gas overpressure protection device 200 includes a drainage pipe 260, one end of the drainage pipe 260 is connected to the flue gas filtering and dust removal device 400, and the other end is inserted below the liquid surface of the water seal tank 240 (the insertion depth below the liquid surface is adapted to the above-mentioned set threshold), and the upper space of the liquid surface in the water seal tank 240 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The flue gas pretreatment device 300 includes an airflow buffer, which has an airflow buffer cylinder 310. An airflow buffer space is formed in the airflow buffer cylinder 310. The airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the phosphorus furnace 100 and an exhaust port for outputting the pretreated yellow phosphorus flue gas.

Preferably, the water seal tank 240 has a closed space 241 and an open space 242 forming a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid surface of the closed space 241 (the insertion depth below the liquid surface is adapted to the above-mentioned set threshold), and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The main difference between the yellow phosphorus fume purification system shown in Figure 3 and the yellow phosphorus fume purification system shown in Figures 1-2 is that the flue gas overpressure protection device 200 and the flue gas airflow driving device 500 are arranged in parallel between the flue gas filtering and dust removal device 400 and the yellow phosphorus condensation recovery device 600.

The advantages of the yellow phosphorus fume purification system shown in FIG3 over the yellow phosphorus fume purification system shown in FIG1-2 are: first, the yellow phosphorus fume passing through the water seal tank 240 is the yellow phosphorus fume filtered and dusted by the fume filtration and dust removal device 400, so the amount of solid slag generated in the water seal tank 240 is very small, and the yellow phosphorus in the water seal tank 240 has a higher purity and can be directly refined. Second, the fume pretreatment device 300 and the fume filtration and dust removal device 400 are close to the phosphorus furnace 100, which can more effectively prevent the yellow phosphorus fume from precipitating liquid yellow phosphorus before entering the fume filtration and dust removal device 400.

Fig. 4 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. As shown in Fig. 4, the yellow phosphorus fume purification system comprises: a fume overpressure protection device 200, a fume pretreatment device 300, a fume filtration and dust removal device 400, a fume airflow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas overpressure protection device 200 is used to receive the yellow phosphorus flue gas discharged from the phosphorus furnace 100, and guide the yellow phosphorus flue gas to a discharge tower (not shown in the figure) or a yellow phosphorus condensation recovery device 600 when the pressure of the yellow phosphorus flue gas reaches a set threshold, and guide it to the flue gas pretreatment device 300 when the pressure of the yellow phosphorus flue gas does not reach the set threshold.

The flue gas pretreatment device 300 is arranged between the flue gas overpressure protection device 200 and the flue gas filtering and dust removal device 400, and is used to receive the yellow phosphorus flue gas from the flue gas overpressure protection device 200, pretreat the yellow phosphorus flue gas, and then output the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removal device 400 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercept the dust in the yellow phosphorus flue gas through the filter element 410, and then output the filtered and dust-removed purified yellow phosphorus flue gas.

The flue gas flow driving device 500 is used to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removal device 400, and after increasing the pressure of the yellow phosphorus flue gas by mechanical energy, discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used to receive the yellow phosphorus flue gas from the flue gas flow driving device 500, and directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from gas to liquid and stored in the yellow phosphorus tank 610, while outputting the tail gas.

Among them, the flue gas overpressure protection device 200 includes a cylindrical container 210, one side opening of the cylindrical container 210 is connected to the phosphorus furnace 100 through a first vertically inclined tube 220, and the other side opening is connected to the flue gas pretreatment device 300 through a second vertically inclined tube 230, and the bottom opening is inserted below the liquid surface of the water seal tank 240.

The water seal tank 240 has a closed space 241 and an open space 242 forming a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space 241 in the water seal tank 240 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

In addition, the flue gas pretreatment device 300 includes an airflow buffer and a water seal groove 340. The airflow buffer has an airflow buffer cylinder 310. An airflow buffer space is formed in the airflow buffer cylinder 310. The airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an exhaust port for outputting the pretreated yellow phosphorus flue gas. The bottom of the airflow buffer cylinder 310 is provided with a discharge channel communicating with the airflow buffer space. The bottom opening of the discharge channel is inserted below the liquid surface of the water seal groove 340. The water seal groove 340 is water-sealed with hot water at a temperature of 30°C-70°C, preferably 40°C-60°C. The depth of the bottom opening of the discharge channel inserted below the liquid surface of the water seal groove 340 should ensure that the water seal groove 340 can always maintain a water seal state. The bottom of the water seal groove 340 is provided with a discharge structure 341.

In addition, the flue gas filtering and dust removal device 400 includes a dust collector cylinder 420 and a water seal groove 470. The filter element 410 is installed in the dust collector cylinder 420 through a filter element mounting plate 430 and divides the dust collector cylinder into a lower original air chamber 440 and an upper clean air chamber 450. The original air chamber 440 is provided with an air inlet for receiving the yellow phosphorus flue gas to be filtered and dust-removed and purified. The clean air chamber 450 is provided with an exhaust port for outputting the yellow phosphorus flue gas after filtering, dust-removing and purification. The bottom of the dust collector cylinder 420 is provided with a discharge channel 460 communicating with the original air chamber 440, and the bottom opening of the discharge channel 460 is inserted below the liquid surface of the water seal groove 470. The water seal groove 470 is water-sealed with hot water at a temperature of 30°C-70°C, preferably 40°C-60°C. The bottom opening of the unloading channel is inserted into the water seal groove 470 to a depth below the liquid surface to ensure that the water seal groove 470 can always maintain a water seal state. A discharge structure 471 is provided at the bottom of the water seal groove 470.

Compared with the yellow phosphorus flue gas purification system shown in Figures 1-3, the yellow phosphorus flue gas purification system shown in Figure 4 is designed to insert the discharge channel below the liquid level of the water seal tank for the discharge of dust in the flue gas pretreatment device 300 and the flue gas filtration and dust removal device 400, which greatly simplifies the structure compared with the two-stage ash discharge method. The dust discharged through the discharge channel can sink below the liquid level of the corresponding water seal tank, avoiding the yellow phosphorus carried in the dust from contacting with the air, and the dust and the condensed yellow phosphorus are discharged through the discharge structure.

On the basis of the above-mentioned yellow phosphorus fume purification system, the fume pretreatment device 300 and/or the fume filtration and dust removal device 400 comprises an opening and closing control mechanism for switching the corresponding discharge channel between an open state and a closed state.

The opening and closing control mechanism can be an opening and closing control mechanism that automatically switches between an open state and a closed state according to the pressure of the material to be unloaded in the unloading channel on the opening and closing control mechanism; when the pressure of the material to be unloaded in the unloading channel on the opening and closing control mechanism reaches a set condition, the opening and closing control mechanism opens, and when the set condition is not reached, the opening and closing control mechanism closes.

Optionally, the opening and closing control mechanism includes a flip plate installed in the unloading channel via a damping mechanism. When the pressure of the material to be unloaded in the unloading channel on the flip plate exceeds the flip resistance applied to the flip plate by the damping mechanism, the flip plate flips to open the unloading channel; when the pressure of the material to be unloaded in the unloading channel on the flip plate does not exceed the flip resistance applied to the flip plate by the damping mechanism, the flip plate closes the unloading channel.

Fig. 5 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. As shown in Fig. 5, the yellow phosphorus fume purification system comprises: a fume pretreatment device 300, a fume filtration and dust removal device 400, a fume airflow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the phosphorus furnace 100 and the flue gas filtering and dust removal device 400, and is used for receiving the yellow phosphorus flue gas from the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and then outputting the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removal device 400 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercept the dust in the yellow phosphorus flue gas through the filter element 410, and then output the filtered and dust-removed purified yellow phosphorus flue gas.

The flue gas flow driving device 500 is used to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removal device 400, and after increasing the pressure of the yellow phosphorus flue gas by mechanical energy, discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used to receive the yellow phosphorus flue gas from the flue gas flow driving device 500, and directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from gas to liquid and stored in the yellow phosphorus tank 610, while outputting the tail gas.

The flue gas pretreatment device 300 includes an airflow buffer and a water seal groove 340. The airflow buffer has an airflow buffer cylinder 310. An airflow buffer space is formed in the airflow buffer cylinder 310. The airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an exhaust port for outputting the pretreated yellow phosphorus flue gas. The bottom of the airflow buffer cylinder 310 is provided with a discharge channel communicating with the airflow buffer space. The bottom opening of the discharge channel is inserted below the liquid surface of the water seal groove 340. The water seal groove 340 is water-sealed with hot water at a temperature of 30°C-70°C, preferably 40°C-60°C. A discharge structure 341 is provided at the bottom of the water seal groove 340.

In addition, as shown in Figure 11, the water seal tank 340 has a closed space 241 and an open space 242 that constitute a communicating vessel, the bottom opening of the unloading channel is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space 241 in the water seal tank 340 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The flue gas filtering and dust removal device 400 includes a dust collector cylinder 420 and a water seal groove 470. The filter element 410 is installed in the dust collector cylinder 420 through a filter element mounting plate 430 and divides the dust collector cylinder into a lower original air chamber 440 and an upper clean air chamber 450. The original air chamber 440 is provided with an air inlet for receiving the yellow phosphorus flue gas to be filtered and dust-removed and purified. The clean air chamber 450 is provided with an exhaust port for outputting the yellow phosphorus flue gas after filtering, dust-removing and purification. The bottom of the dust collector cylinder 420 is provided with a discharge channel 460 communicated with the original air chamber 440, and the bottom opening of the discharge channel 460 is inserted below the liquid surface of the water seal groove 470. The water seal groove 470 is water-sealed with hot water at a temperature of 30°C-70°C, preferably 40°C-60°C. The bottom opening of the unloading channel is inserted into the depth below the liquid surface of the water seal groove 470 to ensure that the water seal groove 470 can always maintain a water seal state. A discharge structure 471 is provided at the bottom of the water seal groove 470.

Compared with the yellow phosphorus flue gas purification system shown in Figure 4, the yellow phosphorus flue gas purification system shown in Figure 5 cancels the flue gas overpressure protection device 200 that was originally independent of the flue gas pretreatment device 300, and directly improves the water seal tank 340 of the flue gas pretreatment device 300 to a flue gas overpressure protection device. In this way, the dust unloading function of the flue gas pretreatment device 300 and the function of the flue gas overpressure protection device are realized at the same time.

When the water seal groove 340 of the flue gas pretreatment device 300 is improved into a flue gas overpressure protection device, the depth of the bottom opening of the discharge channel of the airflow buffer inserted below the liquid surface of the enclosed space 241 should be controlled to an appropriate depth, so that when the air pressure of the yellow phosphorus flue gas in the airflow buffer reaches a set threshold, pressure relief is achieved through the water seal groove 340.

Fig. 6 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. As shown in Fig. 6, the yellow phosphorus fume purification system comprises: a fume pretreatment device 300, a fume filtration and dust removal device 400, a fume airflow driving device 500 and a yellow phosphorus condensation recovery device 600.

The flue gas pretreatment device 300 is disposed between the phosphorus furnace 100 and the flue gas filtering and dust removal device 400, and is used for receiving the yellow phosphorus flue gas from the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and then outputting the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removal device 400 is used to receive the yellow phosphorus flue gas from the flue gas pretreatment device 300, and under the temperature condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, physically intercept the dust in the yellow phosphorus flue gas through the filter element 410, and then output the filtered and dust-removed purified yellow phosphorus flue gas.

The flue gas flow driving device 500 is used to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removal device 400, and after increasing the pressure of the yellow phosphorus flue gas by mechanical energy, discharge the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used to receive the yellow phosphorus flue gas from the flue gas flow driving device 500, and directly or indirectly condense the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from gas to liquid and stored in the yellow phosphorus tank 610, while outputting the tail gas.

The flue gas pretreatment device 300 includes an airflow buffer and a water seal groove 340. The airflow buffer has an airflow buffer cylinder 310. An airflow buffer space is formed in the airflow buffer cylinder 310. The airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an exhaust port for outputting the pretreated yellow phosphorus flue gas. The bottom of the airflow buffer cylinder 310 is provided with a discharge channel communicating with the airflow buffer space. The bottom opening of the discharge channel is inserted below the liquid surface of the water seal groove 340. The water seal groove 340 is water-sealed with hot water at a temperature of 30°C-70°C, preferably 40°C-60°C. The depth of the bottom opening of the discharge channel inserted below the liquid surface of the water seal groove 340 should ensure that the water seal groove 340 can always maintain a water seal state. The bottom of the water seal groove 340 is provided with a discharge structure 341.

The flue gas filtering and dust removal device 400 comprises a dust collector barrel 420 and a water seal groove 470. The filter element 410 is installed in the dust collector barrel 420 through a filter element mounting plate 430 and the dust collector barrel is divided into a lower raw air chamber 440 and an upper clean air chamber 450. The raw air chamber 440 is provided with an air inlet for receiving the yellow phosphorus flue gas to be filtered and dusted, and the clean air chamber 450 is provided with an exhaust port for outputting the yellow phosphorus flue gas after filtering and dusting. The bottom of the dust collector barrel 420 is provided with a discharge channel 460 communicating with the raw air chamber 440, and the bottom opening of the discharge channel 460 is inserted below the liquid surface of the water seal groove 470. The water seal groove 470 is water-sealed with hot water at a temperature of 30°C-70°C, preferably 40°C-60°C, and a discharge structure 471 is provided at the bottom of the water seal groove 470.

In addition, the water seal tank 470 has a closed space 241 and an open space 242 forming a communicating vessel, the bottom opening of the discharge channel is inserted below the liquid surface of the closed space 241, and the upper space of the liquid surface of the closed space 241 in the water seal tank 340 is connected to the discharge tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

Compared with the yellow phosphorus fume purification system shown in Figure 4, the yellow phosphorus fume purification system shown in Figure 6 cancels the flue gas overpressure protection device 200 that was originally independent of the flue gas pretreatment device 300 and the flue gas filtering and dust removal device 400, and directly improves the water seal groove 470 of the flue gas filtering and dust removal device 400 to a flue gas overpressure protection device. In this way, the dust unloading function of the flue gas filtering and dust removal device 400 and the function of the flue gas overpressure protection device are realized at the same time.

When the water seal groove 470 of the flue gas filtering and dust removal device 400 is improved into a flue gas overpressure protection device, the depth of the bottom opening of the discharge channel of the flue gas filtering and dust removal device 400 inserted below the liquid surface of the enclosed space 241 should be controlled to be at an appropriate depth, so that when the air pressure of the yellow phosphorus flue gas in the airflow buffer reaches a set threshold, pressure relief is achieved through the water seal groove 470.

FIG7 is a schematic diagram of the structure of a yellow phosphorus flue gas purification system according to an embodiment of the present application. The yellow phosphorus flue gas purification system shown in FIG7 improves the structure of the flue gas pretreatment device 300 on the basis of the yellow phosphorus flue gas purification system shown in FIG1. FIG12 is an engineering structure diagram of a flue gas pretreatment device according to an embodiment of the present application. The flue gas pretreatment device 300 in the yellow phosphorus flue gas purification system shown in FIG7 adopts the flue gas pretreatment device shown in FIG12.

As shown in Figures 7 and 12, the airflow buffer has an air intake section 311, a variable diameter contraction section 312, a variable diameter expansion section 313 and an exhaust section 314 which are arranged in sequence from bottom to top. The air intake port is arranged on the air intake section 311, the exhaust port is arranged on the exhaust section 314, and the electric heater 320 is installed in the exhaust section 314 and is arranged opposite to the outlet of the variable diameter expansion section 313.

When the airflow buffer is in operation, the airflow velocity increases by the Venturi effect when passing through the variable diameter contraction section 312 and the variable diameter expansion section 313, so that the dust on the electric heater 320 is impacted to a certain extent by the airflow, and the dust and other pollutants attached to the electric heater 320 are reduced, and the problem of reduced heat exchange efficiency of the electric heater 320 is alleviated. In addition, due to the increase in the airflow velocity, the time for the airflow to pass through the electric heater 320 is shortened, which can effectively prevent the yellow phosphorus from being converted into red phosphorus.

Typically, the diameter-reducing and contracting section 312 and the diameter-reducing and expanding section 313 are connected via a connecting neck 315 to facilitate manufacturing.

In addition, as shown in FIG. 12 , the diameter of the exhaust section 314 is smaller than the diameter of the intake section 311 , and the volume of the exhaust section 314 is also significantly smaller than the volume of the intake section 311 , thus further ensuring that the airflow passes through the exhaust section 314 quickly.

The yellow phosphorus flue gas purification system shown in FIG. 7 can also refer to the above-mentioned embodiment to improve the unloading structure (ash discharge device) and unloading method of the flue gas pretreatment device 300 and/or the flue gas filtering and dust removal device 400.

Fig. 8 is a schematic diagram of the structure of a yellow phosphorus fume purification system according to an embodiment of the present application. The yellow phosphorus fume purification system shown in Fig. 8 is based on the yellow phosphorus fume purification system shown in Fig. 1, and improves the relevant structure of the fume filtration and dust removal device 400.

As shown in FIG8 , the flue gas filtering and dust removal device 400 is provided with a filter element regeneration liquid cleaning structure, a regeneration liquid discharge structure and a dust collector drying structure. The filter element regeneration liquid cleaning structure is used to provide the filter element 410 with a regeneration liquid that can clean the pollutants on the filter element 410; the regeneration liquid discharge structure is arranged at the bottom of the dust collector cylinder 420 and communicates with the lower part of the original air chamber; the dust collector drying structure is used to dry the inside of the dust collector cylinder 420. Here, the regeneration liquid can be hot water.

Thus, the flue gas filtering and dust removal device 400 can implement the following filter element regeneration method: first, close the air intake of the yellow phosphorus flue gas to be filtered; then, provide the regeneration liquid to the filter element 410 through the filter element regeneration liquid cleaning structure; discharge the regeneration liquid from the dust collector cylinder 420 through the regeneration liquid discharge structure; and dry the inside of the dust collector cylinder 420 through the dust collector drying structure. This regeneration method is simpler and safer. This regeneration method is not only applicable to the flue gas filtering and dust removal device for yellow phosphorus flue gas, but also to the flue gas filtering and dust removal device for coal gas containing tar.

Optionally, the filter element regeneration liquid cleaning structure provides the regeneration liquid to the filter element 410 through the filter element backwashing and cleaning structure 470. Specifically, the filter element regeneration liquid cleaning structure comprises a regeneration liquid delivery pipe 474, one end of which is connected to the compressed gas delivery pipe 471 through a second control valve, and the other end of which is connected to a regeneration liquid supply facility.

Optionally, the flue gas filtering and dust removal device 400 includes a filter element steam cleaning structure, which is used to provide water vapor to the filter element 410 to clean pollutants on the filter element. Optionally, the filter element steam cleaning structure provides the water vapor to the filter element 410 through the filter element backwash cleaning structure 470. Specifically, the filter element steam cleaning structure includes a water vapor delivery pipe 475, one end of which is connected to the compressed gas delivery pipe 471 through a third control valve, and the other end of the water vapor delivery pipe 475 is connected to a water vapor supply facility.

Thus, water vapor that can clean the pollutants on the filter element (mainly a mixture of yellow phosphorus and dust) can be provided to the filter element 410 through the filter element steam cleaning structure, and the water vapor can melt the yellow phosphorus on the filter element 410, so that the liquid yellow phosphorus carrying the dust can be separated from the filter element 410. Then, the regeneration liquid (hot water) that can clean the pollutants on the filter element 410 is provided to the filter element 410 through the filter element regeneration liquid cleaning structure, so that the pollutants on the filter element 410 can be thoroughly cleaned. The combination of the filter element steam cleaning structure and the filter element regeneration liquid cleaning structure can save the amount of regeneration liquid (hot water) used.

The regeneration liquid discharge structure can directly utilize the discharge structure (ash discharge device) at the bottom of the flue gas filtering and dust removal device 400. In this way, the discharge channel 460, the discharge valve, the intermediate ash tank 481 and the storage tank 482 can also be cleaned with water vapor and hot water.

Optionally, the dust collector drying structure includes a drying gas circulation loop 700 located outside the dust collector cylinder 420 and connected between the air intake structure and the exhaust structure of the flue gas filtering and dust removal device 400. The drying gas circulation loop 700 is provided with a drying gas heating device and can be connected to a drying gas supply pipeline. Nitrogen can be used for the drying gas.

Specifically, the air inlet of the airflow buffer is connected to the air inlet structure via a pipe, the exhaust structure is connected to the air inlet of the airflow buffer via a pipe, and a circulating fan 710 is provided on the pipe between the exhaust structure and the air inlet of the airflow buffer, thereby forming the drying gas circulation loop. Since the airflow buffer itself is provided with an electric heater 320, the electric heater 320 is used here as a drying gas heating device.

The drying gas circulation loop 700 can not only quickly dry the inside of the dust collector cylinder 420, but also preheat the airflow buffer and the pipeline between the airflow buffer and the flue gas filtering and dust removal device 400, so that yellow phosphorus will not stick to the pipe when it is restarted later.

The above is a description of the relevant contents of the present application. A person skilled in the art will be able to implement the present application based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims (10)

1. Yellow phosphorus flue gas clean system, its characterized in that includes:

The smoke filtering and dust removing device is used for receiving yellow phosphorus smoke from the phosphorus smoke discharge, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that the yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dust removing and purifying;

the flue gas flow driving device is used for receiving the yellow phosphorus flue gas output by the flue gas filtering and dust removing device, and discharging the pressurized yellow phosphorus flue gas after the pressure of the yellow phosphorus flue gas is increased by mechanical energy;

The yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas airflow driving device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state to a liquid state, then storing the yellow phosphorus in a yellow phosphorus tank, and outputting tail gas;

The smoke overpressure protection device is used for receiving yellow phosphorus smoke output by the smoke filtering and dust removing device, and guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device through a bypass when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and cutting off the bypass when the air pressure of the yellow phosphorus smoke does not reach the set threshold value;

The smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the water seal tank, and the upper space of the liquid level in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline;

The water seal tank is provided with a closed space and an open space which form a communicating vessel, one end of the drainage tube is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline;

The water seal tank is provided with a lower tank body and an upper tank body, the upper tank body is arranged in the lower tank body in an inverted manner through a connecting piece connected between the lower tank body and the upper tank body, a bottom channel and a side channel are reserved between the upper tank body and the lower tank body, so that a closed space is formed between the inner part of the upper tank body and the bottom channel, and an open space is formed between the side channel;

And an overflow port communicated with the upper part of the open space is arranged on the water seal groove, and overflow is realized when the liquid level in the open space rises to the overflow port.

2. The yellow phosphorus flue gas cleaning system of claim 1, wherein: the device comprises a flue gas pretreatment device, a dust removing device and a dust removing device, wherein the flue gas pretreatment device is arranged between the flue gas filtration dust removing device and the phosphorus furnace and is used for receiving yellow phosphorus flue gas discharged by the phosphorus furnace, pretreating the yellow phosphorus flue gas and outputting pretreated yellow phosphorus flue gas;

The smoke filtering and dust removing device is used for receiving yellow phosphorus smoke from the smoke pretreatment device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the temperature condition that yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting yellow phosphorus smoke after filtering, dust removing and purifying;

The flue gas pretreatment device comprises an air flow buffer, wherein the air flow buffer is provided with an air flow buffer cylinder body, an air flow buffer space is formed in the air flow buffer cylinder body, and an air inlet for receiving yellow phosphorus flue gas from the phosphorus furnace and an air outlet for outputting pretreated yellow phosphorus flue gas are arranged in the air flow buffer space.

3. A yellow phosphorus flue gas cleaning system as recited in claim 2, wherein: the flue gas pretreatment device further comprises a heating structure for heating yellow phosphorus flue gas in the flue gas pretreatment device.

4. A yellow phosphorus flue gas cleaning system according to claim 3 and wherein: the air flow buffer is provided with an air inlet section, a reducing shrinkage section, a reducing expansion section and an exhaust section which are sequentially arranged from bottom to top, the air inlet is arranged on the air inlet section, and the exhaust port is arranged on the exhaust section;

The heating structure comprises an electric heater which is arranged in the exhaust section and is arranged opposite to the outlet of the reducing expansion section.

5. A yellow phosphorus flue gas cleaning system as recited in claim 2, wherein: the bottom of the air flow buffer cylinder body is provided with a discharging channel communicated with the air flow buffer space;

The flue gas pretreatment device further comprises a water seal tank, the discharging channel is inserted below the liquid level of the water seal tank, and a discharging structure is arranged at the bottom of the water seal tank.

6. The yellow phosphorus flue gas cleaning system of claim 1, wherein: the flue gas filtering dust removal device comprises a dust remover cylinder body, the filter element is arranged in the dust remover cylinder body through a filter element mounting plate and divides the dust remover cylinder body into a lower original air chamber and an upper air purifying chamber, an air inlet for receiving yellow phosphorus flue gas to be filtered, dedusted and purified is arranged on the original air chamber, an air outlet for outputting the yellow phosphorus flue gas after filtering, dedusting and purifying is arranged on the air purifying chamber, and a discharging channel communicated with the original air chamber is arranged at the bottom of the dust remover cylinder body.

7. The yellow phosphorus flue gas cleaning system of claim 6, wherein: the smoke filtering and dedusting device further comprises a water seal tank, the discharging channel is directly inserted below the liquid level of the water seal tank, and a discharging structure is arranged at the bottom of the water seal tank.

8. The yellow phosphorus flue gas cleaning system of claim 1, wherein: the yellow phosphorus condensation recovery device comprises more than 2 spray towers which are connected in series or in parallel, and the spray towers directly spray cooling liquid to the yellow phosphorus flue gas so as to condense the yellow phosphorus flue gas, so that the yellow phosphorus is converted into liquid from gas and then is stored in a yellow phosphorus tank at the bottom of the spray towers.

9. The yellow phosphorus flue gas cleaning system of claim 8, wherein: the yellow phosphorus condensation recovery device comprises M spray towers which are connected in series, wherein M is an integer more than or equal to 2;

And the smoke overpressure protection device guides the yellow phosphorus smoke into an Nth spray tower in the yellow phosphorus condensation recovery device according to the positive number of the flow direction of the yellow phosphorus smoke when the air pressure of the yellow phosphorus smoke reaches a set threshold, wherein N is an integer which is more than or equal to 2 and less than or equal to M.

10. Industrial kiln gas cleaning device, its characterized in that includes:

the flue gas filtering and dust removing device is used for receiving flue gas discharged from an industrial kiln, physically intercepting dust in the flue gas through a filter element, and then outputting the flue gas after filtering, dust removing and purifying;

the flue gas flow driving device is used for receiving the flue gas output from the flue gas filtering and dust removing device, and discharging the pressurized yellow phosphorus flue gas after the pressure of the yellow phosphorus flue gas is increased by mechanical energy;

The flue gas overpressure protection device is used for receiving flue gas from the flue gas filtering and dust removing device, and guiding the flue gas to a diffusing tower or subsequent equipment of the flue gas flow driving device through a bypass when the air pressure of the flue gas reaches a set threshold value, and cutting off the bypass when the air pressure of the flue gas does not reach the set threshold value;

The smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the liquid seal groove, and the upper space of the liquid level in the liquid seal groove is connected with the diffusing tower or the follow-up equipment of the smoke airflow driving device through a pipeline;

the liquid seal tank is provided with a closed space and an open space which form a communicating vessel, one end of the drainage tube is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline;

The liquid seal tank is provided with a lower tank body and an upper tank body, wherein the upper tank body is arranged in the lower tank body in an inverted manner through a connecting piece connected between the lower tank body and the upper tank body, a bottom channel and a side channel are reserved between the upper tank body and the lower tank body, so that a closed space is formed between the inner part of the upper tank body and the bottom channel, and an open space is formed between the side channel;

And an overflow port communicated with the upper part of the open space is arranged on the liquid seal groove, and overflow is realized when the liquid level in the open space rises to the overflow port.