CN111117685A - Oxygen-enriched air blast management system in front of catalytic cracker - Google Patents
Oxygen-enriched air blast management system in front of catalytic cracker Download PDFInfo
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- CN111117685A CN111117685A CN201911409259.0A CN201911409259A CN111117685A CN 111117685 A CN111117685 A CN 111117685A CN 201911409259 A CN201911409259 A CN 201911409259A CN 111117685 A CN111117685 A CN 111117685A
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G11/00—Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
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Abstract
The invention relates to a management system for oxygen-enriched air blast in front of a catalytic cracker. The management system includes: skid-mounted devices and oxygen/air mixing devices; the air inlet of the skid-mounted device is connected with the air outlet of the oxygen/air mixing device; the gas outlet of the skid-mounted device is connected with the reactor; air and rich oxygen are introduced into an air inlet of the oxygen/air mixing device; the oxygen/air mixing device is used for mixing oxygen-enriched air with the pressure of 4KPa and air to enable the pressure of mixed gas to be lower than a pressure compression threshold value, and the mixed gas is input into the skid-mounted device; the skid-mounted device is used for adjusting the gas concentration of the oxygen/air mixing device, and the gas concentration of the mixed gas after adjustment is 26%. The management system provided by the invention injects oxygen behind the compressor, an oxygen generating device is not required to be added, the cost is reduced, and the safety of gas transmission in a gas pipeline is improved by adopting low-pressure mixed gas.
Description
Technical Field
The invention relates to the field of oxygen-enriched air blast management, in particular to a front oxygen-enriched air blast management system of a catalytic cracker.
Background
The catalyst of the catalytic cracking device is burnt and regenerated, air is compressed to about 0.3MPa by an air compressor and is sent to a regenerator for burning reaction, and the burnt and regenerated catalyst is sent to a reactor for catalytic reaction, so that the method is an important secondary processing means in the oil refining industry, and creates huge economic and social benefits. With the continuous increase of the oil demand, the air supply capacity of the main fan is limited by the bottleneck. If oxygen enrichment is mixed into the main blower, the processing capacity of the device is improved or the operation severity is increased. At present, high-concentration oxygen (99%) is boosted to 0.7MPa and sprayed into an outlet pipeline of a main fan in catalytic cracking regeneration oxygen-enriched combustion experiments. Because the high-concentration oxygen and the pressure are 0.7MPa, the oxygen source is provided by a newly-built oxygen production device, two to three oxygen superchargers are needed, the pipeline requirement is strict, 316 stainless steel is generally required, and the post-oxygen injection technology of the compressor causes large investment. Meanwhile, oxygen with the pressure of 0.7MPa has higher danger than low-pressure oxygen, and if the oxygen meets the catalytic action of static electricity, thunder, rust and iron powder and the material particles moving at high speed rub against the pipe wall to generate static electricity and sparks, the ignition of grease can cause the explosion of the oxygen. Especially, the heat insulation compression temperature can reach more than 358 ℃ to 670 ℃ when the pipeline valve is suddenly opened (calculated according to the highest pressure of oxygen management, namely 0.3 MPa); although the regenerative oxygen-enriched combustion brings good economic benefit, the problems of large investment, large operation cost (the cost of 2-3 oxygen superchargers and cooling water is more than 2000 ten thousand per year) and large safety risk exist.
Some foreign research units add oxygen to the regeneration system of the catalytic cracking unit of the oil refinery to ensure that the oxygen concentration is between 26 and 28 percent, the coking capability of the regenerator does not increase the reconstruction of the regeneration system, and the efficiency of the regenerator is improved by 25 to 30 percent by using the original equipment and the operation method. Because the oxygen adding technology adopts the injection on the outlet pipeline of the compressor, the oxygen adding pressure is in the pressure level of 1.6MPa, a set of oxygen generating device is added, and three oxygen superchargers are added, so the investment is large and the operating cost is high. Because the working pressure of oxygen is in the level of 1.6MPa, the conveying pipeline of the oxygen is required to be made of stainless steel, and medium-pressure oxygen is more dangerous than low-pressure oxygen and is easy to cause safety accidents, so that the oxygen conveying pipeline has certain problems in popularization and application.
Disclosure of Invention
The invention aims to provide a management system for oxygen-enriched blast in front of a catalytic cracker, which aims to solve the problems of high investment, high cost and low safety of the existing compressor rear oxygen injection technology.
In order to achieve the purpose, the invention provides the following scheme:
a catalytic cracker front oxygen-rich blast management system, comprising: skid-mounted devices and oxygen/air mixing devices;
the air inlet of the skid-mounted device is connected with the air outlet of the oxygen/air mixing device; the gas outlet of the skid-mounted device is connected with the reactor; air and rich oxygen are introduced into an air inlet of the oxygen/air mixing device; the oxygen/air mixing device is used for mixing oxygen-enriched air with the pressure of 4KPa and air to enable the pressure of mixed gas to be lower than a pressure compression threshold value, and the mixed gas is input into the skid-mounted device; the skid-mounted device is used for adjusting the gas concentration of the oxygen/air mixing device, and the gas concentration of the mixed gas after adjustment is 26%.
Optionally, the skid-mounted device specifically includes: the oxygen-enriched emergency cut-off valve comprises a manual cut-off valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency cut-off valve, a second flame arrester, an oxygen-enriched flow regulating valve and a second oxygen-enriched emergency cut-off valve;
the manual stop valve first spark arrester oxygen flow changer first filter first oxygen boosting emergency cut-off valve the second spark arrester oxygen boosting flow control valve and the emergency cut-off valve of second oxygen boosting connects gradually, the emergency cut-off valve of second oxygen boosting still with third spark arrester among the oxygen/air mixing arrangement is connected.
Optionally, the skid-mounted device further includes: a second filter and a nitrogen purge sealing valve;
the second filter is connected with the nitrogen purging and sealing valve; and the gas transmission pipeline of the nitrogen purging and sealing valve is also connected with a connecting pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester, and a connecting pipeline between the oxygen-enriched flow regulating valve and the second oxygen-enriched emergency cut-off valve.
Optionally, the skid-mounted device further includes: a high point vent valve;
the connecting pipeline of high point atmospheric valve with first oxygen boosting emergency cut-off valve with the connecting pipeline between the second spark arrester, and oxygen-enriched flow control valve with connecting pipeline between the second oxygen boosting emergency cut-off valve is connected.
Optionally, the oxygen/air mixing device specifically includes: an air compressor, an oxygen/air mixer, a third flame arrestor;
the input end of the air compressor comprises an air input end and an oxygen-enriched input end, and the air input end is used for introducing air; the oxygen-enriched input end is connected with one end of the third flame arrester; the other end of the third flame arrester is connected with the skid-mounted device; the oxygen-enriched input end is used for inputting enriched oxygen; the third flame arrestor is for preventing the spread of a fire.
Optionally, the oxygen/air mixer specifically includes: a jacket and an ejector;
the ejector is arranged inside the jacket; the inner side of the jacket is provided with a reticular hole, and the ejector is provided with an ejection hole; the oxygen-enriched air is sucked into the oxygen/air mixer through the mesh holes of the jacket and then is sprayed into the inner cavity of the oxygen/air mixer through the ejector, and the oxygen-enriched air and the air are fully mixed in the inner cavity of the oxygen/air mixer.
Optionally, the ejector is a rod ejector.
Optionally, the air compressor is a blower; an oxygen analyzer is arranged between the air blower and the oxygen/air mixer.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a management system for oxygen-enriched blast air before a catalytic cracker, which adopts the oxygen-enriched blast air before the catalytic cracker for regeneration and coke burning, and tests show that the proportion of the oxygen-enriched concentration of main air and the increase of the coke burning intensity are in a direct proportion relation, when the oxygen-enriched concentration of the main air is 26 percent, the coke burning intensity of a regenerator can be increased to 15.8 percent, and the processing capacity of a catalytic device can be increased to 23 percent; because the oxygen pressure is transmitted under the low pressure state, and the low pressure oxygen discharged from the original nitrogen and oxygen station of the oil refinery is utilized, an oxygen generating device is not required to be added, the pipeline transmission can adopt a common carbon steel pipe, and the method has the advantages of safety and low investment, the investment cost is 15-20% of the post-machine oxygen injection, the operation cost is 10-15% of the post-machine oxygen injection, meanwhile, the waste oxygen of the nitrogen and oxygen station is reduced, and the pollution of the waste oxygen to the environment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of an oxygen/air mixing device in an FCC front oxygen-rich blower management system provided by the present invention;
FIG. 2 is a diagram of a skid-mounted device in a front oxygen-enriched air management system of a Catalytic Cracking (FCC) unit according to the present invention;
fig. 3 is a structural view of an oxygen/air mixer in the oxygen/air mixing device provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a front oxygen-enriched blast management system of a catalytic cracker, which injects oxygen behind a compressor without adding an oxygen generator, reduces the cost, adopts low-pressure mixed gas and improves the safety of gas transmission in a gas pipeline.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-3, a system for managing oxygen-rich blast in front of a catalytic cracker comprises: skid-mounted devices and oxygen/air mixing devices; the air inlet of the skid-mounted device is connected with the air outlet of the oxygen/air mixing device; the gas outlet of the skid-mounted device is connected with the reactor; air and rich oxygen are introduced into an air inlet of the oxygen/air mixing device; the oxygen/air mixing device is used for mixing oxygen-enriched air with the pressure of 4KPa and air to enable the pressure of mixed gas to be lower than a pressure compression threshold value, and the mixed gas is input into the skid-mounted device; the skid-mounted device is used for adjusting the gas concentration of the oxygen/air mixing device, and the gas concentration of the mixed gas after adjustment is 26%.
The invention aims to adopt 15KPa low-pressure oxygen to be fully mixed with the air at the inlet in front of a catalytic cracking compressor, then the mixed gas of the air and the oxygen is boosted to 0.3MPa by the compressor, and the mixed gas concentration is controlled to be 26 percent and enters a catalytic cracking regenerator coke-burning system, and the purposes are as follows: the processing capacity of the device is improved by 23%; the conversion efficiency and the yield are improved; the flexibility of operation is improved; improving the slag ratio of the catalytic cracking unit; can adapt to raw oil with high sulfur content; reducing sulfur dioxide in the catalytic regeneration flue gas; the safety of oxygen-enriched scorching is improved.
To improve the treatment capacity of the catalytic device, the regeneration capacity of the catalyst circulated from the reactor is mainly improved. The improvement of the regeneration capacity of the regenerator is two ways, and the main fan, the regenerator and internal components are improved, so that the investment is large. Secondly, injecting a stream of rich oxygen into the main blower, so that the method is not limited by the original equipment conditions and has relatively small investment. Tests show that the second path is feasible, namely oxygen enrichment is injected, and the coke burning capacity of the regenerator is improved by means of external factors, so that the treatment capacity of the device is improved. Tests show that the oxygen-enriched concentration proportion of the main air and the coke burning intensity are in a direct proportion relationship, when the oxygen-enriched concentration of the main air is 26%, the coke burning intensity of the regenerator can be improved to 15.8%, and the processing capacity of the catalytic device can be improved to 23%. Thus, the oxygen-rich concentration is an optimum point at which no changes in the original regenerator equipment configuration, operational aspects are required.
The conversion rate and yield are the best points in the test process, the operation is convenient, the yield can be changed according to the requirement only by properly adjusting the oxygen-enriched concentration, and large change is not needed, so the operation flexibility is improved.
As shown in figure 1, the catalytic cracking compressor of the present invention introduces low pressure oxygen before the compressor, and mixes 95% concentration oxygen with 4KPa pressure with inlet air through an inlet static mixer to make the uniformity of the mixture above 95%.
As shown in fig. 2, the Oxygen enrichment concentration can be changed by changing the set value of the Oxygen flow rate control circuit in an Oxygen/compressor interface safety unit (OSU) by the opening degree of an Oxygen control valve in the OSU device; the operations are all automatically controlled by a computer control system of the OSU device, and the operation is convenient, reliable and flexible.
When the feeding of the catalytic device becomes heavy or the slag infiltration amount needs to be increased, the slag ratio of the device is increased, through tests, the strength of thermal oxidation reaction can be increased due to the increase of the oxygen concentration, the hydrogen sulfide content in raw oil can be cracked, the sulfur dioxide in catalytic regeneration flue gas is reduced, sulfur is converted into nontoxic elemental sulfur, and the catalytic regeneration device is beneficial to environmental protection.
As shown in fig. 3, the oxygen concentration of the mixed gas is adjusted by the OSU device, the oxygen on-line analyzer and the oxygen flow meter in front of the oxygen inlet of the mixer, so that the oxygen/air mixed gas concentration at the inlet of the compressor is 26% and the pressure is 0.916MPa (absolute pressure). The flow rate of the mixed gas reaches the process requirement of regeneration and coke burning, the mixed gas enters a coke burning system of a regenerator for catalytic cracking in an oil refinery to carry out thermal oxidation reaction on coke on the surface of the catalyst to remove the coke and restore the activity of the catalyst, and the mixed gas returns to the reactor to continue catalytic cracking reaction. The oxygen-enriched gas (with the oxygen concentration of 26 percent) can increase the regeneration capacity by 23 percent, improve the conversion rate, improve the residue-oil ratio of catalytic cracking, has flexible operation and greatly improves the economic efficiency.
The invention tests and compares the oxygen conveying material, pressure, oxygen concentration and the durability and safety of the material in the blower to the oxygen-enriched concentration, and the table 1 is a test table of the oxygen pressure and flow rate to the pipeline equipment and the blower material, as shown in the table 1.
TABLE 1
As can be seen from Table 1, A, the test and the national standard are compared, and the carbon steel pipe system is safe under the pressure of 15 KPa.
B. The material in the equipment such as the blower meets the requirements.
C. The oxygen/blower interface safety device is made of stainless steel.
1) According to the mechanism of three factors (combustible materials, oxidant and excitation energy) of combustion and explosion, high-purity and high-pressure oxygen conveyed in an oxygen pipeline is an extremely strong oxidant, and the higher the purity is, the higher the pressure is. The stronger and more dangerous the oxidation.
2) Through tests: when the oxygen content is 21-30%, the ignition temperature of other parts except the labyrinth sealing material of the blower is only above 900 ℃, and exceeds 30% or about 50%, and the ignition point is lower than 900 ℃ and even 400 ℃.
Exciting an energy source:
a) when the valve is suddenly opened between high-pressure section and low-pressure section, the oxygen in the low-pressure section is rapidly compressed, so that the heat dissipation is delayed to form so-called heat insulation compression due to the high speed, and the local temperature is suddenly increased to become a fire source (excitation energy source).
b) Impact and extrusion of the valve clack and the valve seat when the valve is started, and friction between valve components.
c) The micro-materials (such as rust, dust, welding slag, impurity particles and the like) moving at high speed rub against the pipe wall to generate static electricity and sparks.
d) External high temperatures such as heating surfaces, flames, radiant heat, etc.
e) And (6) igniting the grease.
f) Catalytic action of iron rust and iron powder
According to the reasons and the characteristics, the following equipment and management are invented in strict accordance with standard requirements in material selection, operation, maintenance and design problems:
an oxygen/compressor interface safety device OSU, in a skid-mounted form, as shown in fig. 1, the skid-mounted device specifically comprises: the oxygen-enriched emergency cut-off valve comprises a manual cut-off valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency cut-off valve, a second flame arrester, an oxygen-enriched flow regulating valve and a second oxygen-enriched emergency cut-off valve; the manual stop valve first spark arrester oxygen flow changer first filter first oxygen boosting emergency cut-off valve the second spark arrester oxygen boosting flow control valve and the emergency cut-off valve of second oxygen boosting connects gradually, the emergency cut-off valve of second oxygen boosting still with third spark arrester among the oxygen/air mixing arrangement is connected.
In practical application, the skid-mounted device further comprises: a second filter and a nitrogen purge sealing valve;
the second filter is connected with the nitrogen purging and sealing valve; and the gas transmission pipeline of the nitrogen purging and sealing valve is also connected with a connecting pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester, and a connecting pipeline between the oxygen-enriched flow regulating valve and the second oxygen-enriched emergency cut-off valve.
In practical application, the skid-mounted device further comprises: a high point vent valve; the connecting pipeline of high point atmospheric valve with first oxygen boosting quick action emergency valve with connecting pipeline between the second spark arrester, and oxygen-enriched flow control valve and connecting pipeline between the second oxygen boosting quick action emergency valve is connected.
The OSU is made of austenitic stainless steel; the safety skid-mounted device comprises an online oxygen content analyzer, an oxygen flow meter, an oxygen temperature transmitter, an oxygen regulating valve, a filter, an oxygen and special safety flame arrester, wherein the oxygen safety chain high point is emptied. The skid-mounted device is manufactured in a factory and is strictly installed, welded, degreased, debugged and sealed and stored by nitrogen according to the standard. The interface safety skid-mounted device is used as an operation platform, so that the operation is convenient and reliable, and is provided with computer control and safety interlock, and the computer has safety level recognitionSyndrome/pattern of reaching
The SIL3 safety certificate is designed with a bidirectional fire-retardant function due to the safety skid of the OSU, so that once a blower or an oxygen pipeline is in fire, the three parts cannot be detonated in series. Thus ensuring the intrinsic safety of the oxygen-enriched blower system in front of the blower.
The operation process of the front oxygen-enriched blast oxygen/compressor interface safety skid-mounted device OSU of the catalytic cracker comprises the following steps: the OSU device D-101 manual stop valve is opened, pure oxygen with the concentration of 95% is introduced from an outer pipeline, the pressure of the pure oxygen is about 15KPa, the temperature is normal temperature, the oxygen enrichment passes through a Z-101 flame arrester, an FT-101 oxygen flow speed changer and a G-101 oxygen filter to the front of an oxygen enrichment emergency stop valve HSV-101 valve, and the Z-101 flame arrester is a set of flame arrester with a bidirectional flame arresting function and has the function of blocking deflagration flame generated by the outer pipeline, so that the outer pipeline is safely isolated from a skid-mounted inner pipeline, and simultaneously, the flame generated by the skid-mounted inner pipeline is isolated from the outer pipeline. The HSV-101 oxygen enrichment emergency cutoff valve is a safety valve, and once a safety accident occurs or an emergency stop state occurs, the HSV-101 is automatically closed within 2 seconds under the command of a safety system seal, so that the OSU device is safely isolated from an outer pipeline.
95% oxygen enrichment is carried out to an FV-102 oxygen enrichment flow regulating valve through an opened HSV-101 cutoff valve through a Z-102 flame arrester. The Z-102 flame arrester is used for blocking sparks generated by particle friction and the like of the FV-102 oxygen-enriched flow regulating valve in the regulating process, and preventing outward ignition (because the oxygen is at 15KPa, the probability of the accident is extremely small in practice).
The FV-102 oxygen-enriched regulating valve controls the opening of the regulating valve through the action of a regulator of a computer according to an oxygen content signal of an air oxygen content transmitter at the inlet of the blower, so that the oxygen content at the inlet of the blower meets the requirement of process control. Oxygen-enriched oxygen passes through an oxygen-enriched adjusting valve to an HSV-102 oxygen emergency cutoff valve and passes through a Z-103 flame arrester and a D-102 manual shutoff valve to a BV oxygen/air mixer.
The oxygen emergency cut-off valve has the same function as the HSV-101 oxygen cut-off valve and is automatically closed within 2 seconds under the command of the safety system, so that the OSU device is safely isolated from the inlet of the blower or the blower body. And meanwhile, the Z-103 flame arrester is a bidirectional flame arresting isolator, so that the situation of flame crossing is prevented.
Safe nitrogen enters the OSU device in two paths through a G-201 filter and a XSV-201 nitrogen purging sealing valve, and the function of the device is purging during start-up and shut-down. The nitrogen gas enters (HSV-101 and HSV-102 are closed) to play a role in safely isolating and removing residual oxygen in the emergency stop and safety accident states.
Oxygen enters the oxygen/air mixer and then is mixed with the outside air entering the air blower in an air-gas phase mode, oxygen is sucked into the BV mixer through the Venturi principle and is uniformly mixed with the air, the mixing uniformity of the oxygen is enabled to be more than 95%, the occurrence of oxygen clusters is prevented, and the safety of the air blower is guaranteed.
As shown in FIG. 1, it was tested that the optimum position of the oxygen/air mixer installed at the inlet of the compressor was at the inlet end of the compressor, and the ratio of the length of the inlet end to the length of the mixer was 0.5L (L is the length of the mixer), and the mixed gas was uniform and no oxygen mass was generated in the compressor.
The inlet pipeline of the blower is led in from the outside of the main blower room through an inlet pipeline, enters an oxygen/air mixer through a constant temperature filter (original), sucks oxygen enrichment on the side surface to reach more than 95% of uniform mixing degree according to the Venturi principle, and enters the blower, so that the oxygen content at the outlet of the blower is about 26%, and enters the main air suction part of the catalytic cracking regenerator through the original outlet pipeline (main air pipeline) of the blower.
Wherein, the equipment such as the outlet pipeline regenerator of the blower and the like is kept unchanged without any modification according to the original equipment, and the oxygen enrichment enters the BV mixer through the Z-103 flame arrester by the OSU interface safety device.
The front oxygen-enriched blast of the catalytic cracker is provided with an independent safety control system which consists of hardware, control software, a safety interlock and an on-line analyzer for the oxygen content of the inlet and the outlet of a compressor, and the front oxygen-enriched blast of the catalytic cracker is provided with
A security certification SIL 3. The safety control system of the invention is connected with the ITCC safety system of the catalytic cracking main blower, and mutually carries out safety interlocking and communication.
In practical applications, the oxygen/air mixing device specifically includes: an air compressor, an oxygen/air mixer, a third flame arrestor; the input end of the air compressor comprises an air input end and an oxygen-enriched input end, and the air input end is used for introducing air; the oxygen-enriched input end is connected with one end of the third flame arrester; the other end of the third flame arrester is connected with the skid-mounted device; the oxygen-enriched input end is used for inputting enriched oxygen; the third flame arrestor is for preventing the spread of a fire.
In practical applications, the oxygen/air mixer specifically includes: a jacket and an ejector; the ejector is arranged inside the jacket; the inner side of the jacket is provided with a reticular hole, and the ejector is provided with an ejection hole; when the oxygen-enriched air is sucked into the oxygen/air mixer through the mesh holes of the jacket, the ejector sprays the oxygen-enriched air into the inner cavity of the oxygen/air mixer, and the oxygen-enriched air and the air are fully mixed in the inner cavity of the oxygen/air mixer.
In practical applications, the ejector is a rod ejector.
In practical application, the air compressor is a blower; an oxygen analyzer is arranged between the air blower and the oxygen/air mixer.
The BV type static mixer, as shown in FIG. 3, tests show that the mixing uniformity of oxygen and air is more than 90%, the BV type static mixer of the invention has approximately equal height and diameter, and oxygen is uniformly distributed to each jet orifice and dispersed and mixed with each other, thus achieving very good mixing effect, and the BV type static mixer has three advantages:
1) the mixing effect is good, and the uniformity is over 95 percent.
2) There is no amplification effect.
3) Is a gas/gas mixer with multiple gas phases and has the function of electrostatic discharge.
The BV mixer is composed of jacket and 4 bar-shaped ejectors, the inner side of the jacket is composed of net-shaped small holes, the bar-shaped ejectors are densely distributed by jet holes, when oxygen-enriched air enters the jacket from the side, the oxygen-enriched air is sucked into the BV mixer through the meshes on the inner side of the jacket by Venturi principle, the oxygen-enriched air is sprayed into the inner cavity of the BV mixer by four bar-shaped ejectors to be fully mixed with air entering the inlet of a blower, the mixing degree is more than 95%, the air mixed with oxygen enters the blower to be compressed to the range of 0.3MPa-0.4MPa, and oxygen content parameters are sent into a computer of an OSU device by an oxygen content analyzer transmitter at the inlet and the outlet of the blower to be controlled to reach.
The invention adopts the pre-machine oxygen-enriched air blast technology, utilizes the waste 15KPa low-pressure oxygen of oil refineries and nitrogen and oxygen stations, the concentration of which is 95 percent, strictly manages and controls the flow rate, the oxygen concentration, the temperature, the static electricity and various particles of pipelines through the interface safety management (skid-mounted) of the oxygen and a catalytic compressor, and fully mixes the oxygen, the oxygen concentration, the temperature, the static electricity and various particles of the pipelines through the negative pressure extraction effect of the inlet of the compressor by using a special gas/gas static mixer, so that the mixing degree of the oxygen, the oxygen concentration, the temperature. The mixed oxygen concentration is 26%, and the optimal control of the interface safety device by a computer is combined with safety interlock (ESD). The computer is a security system with a security level of SIL 3. The safety system is integrated with the safety Interlock (ITCC) of the catalytic cracking compressor. Because the safe operation of the whole front oxygen-enriched air blast system is ensured by adopting the low-pressure oxygen of 15KPa and an interface safety device, the unsafe factor of medium-pressure nitrogen (0.7MPa) is overcome. The original 2-3 oxygen superchargers are cancelled, so that the investment of the front oxygen-enriched air blast system is less than 25% of the rear oxygen-enriched investment. The running cost is 10% of the machine. Because the originally abandoned low-pressure oxygen is utilized, the pollution of the abandoned oxygen is reduced, and the cost of the oxygen is reduced. And the service life of the equipment is prolonged, so the oxygen-enriched air blast management system of the catalytic cracking compressor has a good popularization and application prospect.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides an oxygen boosting blast air management system before catalytic cracker which characterized in that includes: skid-mounted devices and oxygen/air mixing devices;
the air inlet of the skid-mounted device is connected with the air outlet of the oxygen/air mixing device; the gas outlet of the skid-mounted device is connected with the reactor; air and rich oxygen are introduced into an air inlet of the oxygen/air mixing device; the oxygen/air mixing device is used for mixing oxygen-enriched air with the pressure of 4KPa and air to enable the pressure of mixed gas to be lower than a pressure compression threshold value, and the mixed gas is input into the skid-mounted device; the skid-mounted device is used for adjusting the gas concentration of the oxygen/air mixing device, and the gas concentration of the mixed gas after adjustment is 26%.
2. The system for managing oxygen-enriched blast in front of a catalytic cracker according to claim 1, wherein the skid-mounted device specifically comprises: the oxygen-enriched emergency cut-off valve comprises a manual cut-off valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency cut-off valve, a second flame arrester, an oxygen-enriched flow regulating valve and a second oxygen-enriched emergency cut-off valve;
the manual stop valve first spark arrester oxygen flow changer first filter first oxygen boosting emergency cut-off valve the second spark arrester oxygen boosting flow control valve and the emergency cut-off valve of second oxygen boosting connects gradually, the emergency cut-off valve of second oxygen boosting still with third spark arrester among the oxygen/air mixing arrangement is connected.
3. The pre-catalytic cracker oxygen-rich blast management system of claim 2, wherein the skid further comprises: a second filter and a nitrogen purge sealing valve;
the second filter is connected with the nitrogen purging and sealing valve; and the gas transmission pipeline of the nitrogen purging and sealing valve is also connected with a connecting pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester, and a connecting pipeline between the oxygen-enriched flow regulating valve and the second oxygen-enriched emergency cut-off valve.
4. The pre-catalytic cracker oxygen-rich blast management system of claim 3, wherein the skid further comprises: a high point vent valve;
the connecting pipeline of high point atmospheric valve with first oxygen boosting emergency cut-off valve with the connecting pipeline between the second spark arrester, and oxygen-enriched flow control valve with connecting pipeline between the second oxygen boosting emergency cut-off valve is connected.
5. Oxygen-enriched blast management system before catalytic cracker according to claim 1, characterized in that said oxygen/air mixing device comprises in particular: an air compressor, an oxygen/air mixer, a third flame arrestor;
the input end of the air compressor comprises an air input end and an oxygen-enriched input end; the air input end is used for introducing air; the oxygen-enriched input end is connected with one end of the third flame arrester; the other end of the third flame arrester is connected with the skid-mounted device; the oxygen-enriched input end is used for inputting enriched oxygen; the third flame arrestor is for preventing the spread of a fire.
6. Oxygen-enriched blast management system before catalytic cracker according to claim 5, characterized in that said oxygen/air mixer comprises in particular: a jacket and an ejector;
the ejector is arranged inside the jacket; the inner side of the jacket is provided with a reticular hole, and the ejector is provided with an ejection hole; the oxygen-enriched air is sucked into the oxygen/air mixer through the mesh holes of the jacket and then is sprayed into the inner cavity of the oxygen/air mixer through the ejector, and the oxygen-enriched air and the air are fully mixed in the inner cavity of the oxygen/air mixer.
7. The pre-catalytic cracker oxygen-rich blast management system of claim 6, wherein the ejector is a rod ejector.
8. The pre-catalytic cracker oxygen-rich blast management system of claim 7, wherein the air compressor is a blower; an oxygen analyzer is arranged between the air blower and the oxygen/air mixer.
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| RU2843052C1 (en) * | 2024-10-15 | 2025-07-07 | Общество с ограниченной ответственностью "РусГазКрио" (ООО "РусГазКрио") | System for automation of processes of oxygen enrichment of gases supplied through pipeline |
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