WO2013040919A1 - Treatment process for lignite upgrading waste water and lignite upgrading system - Google Patents

Abstract

A treatment process for lignite upgrading waste water comprises: delivering exhaust gas with high content of steam, which is generated in a lignite upgrading process, to a combustor to be incinerated, and then delivering the exhaust gas together with heat-conducting media into a heat-conducting medium inlet of a lignite upgrading device. Also provided is a lignite upgrading system. In the process, contaminant is innocent treated by high-temperature incineration before the waste water is generated. The treatment process is simple, less equipment is involved, and treatment cost is low.

Description

 Process for treating lignite upgrading wastewater and lignite upgrading system The application is submitted to the Chinese Patent Office on September 21, 2011, and the application number is 201110281934.3, and the invention name is "a lignite upgrading wastewater treatment process and lignite extraction The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. Technical field

 The invention relates to the technical field of treating waste materials generated by the lignite upgrading process, in particular to a treatment process of lignite upgrading wastewater with low cost, convenient process and good treatment effect, and lignite upgrading system .

Background technique

 Lignite, also known as diesel coal, is the coal with the lowest degree of coalification, accounting for 40% of the global coal reserves, accounting for 13% of China's coal reserves. The reserves are extremely large, but due to the high moisture content of brown coal (about 20% to 40%), Low calorific value, easy weathering and spontaneous combustion, high transportation cost per unit of energy, is not conducive to long-distance transportation and storage, which restricts the application and development of lignite. Therefore, in recent years, people have begun research on lignite and developed suitable upgrading processes.

 The main reactions and changes of lignite in the process of upgrading pyrolysis:

 1. Dry degassing stage (normal temperature ~ about 300 °C)

The wet moisture in the lignite is evaporated by heat, and the coal is dried, and at the same time, the gas adsorbed in the pores of the coal is released. Desorption occurs at about 200 ° C or higher, and a large amount of C0 _{2 is present} in the evolved gas. This stage can complete the drying and partial deoxidation of lignite. Some lignites are cracked due to dehydration during the drying process, and the particle size distribution of the coal particles is increased, and even more fine coal dust is generated. This stage produces mainly water, as well as some gases such as C0 ₂ and CH ₄ .

 2. The first stage of thermal decomposition (about 300 to about 600 ° C)

This stage is an active decomposition stage, with the depolymerization and decomposition of lignite macromolecules as the main reaction, generating and escaping a large amount of volatile matter. The tar is produced at this stage; the combustible components (CH ₄ , _3⁄4 , CO, C ₂ ~ C ₃ ) in the coal increase with increasing temperature; the solid particles may further become smaller. At this stage, the macromolecular oxygenates at the end of the coal begin to decompose to form C0 ₂ , water and phenols (mainly higher phenols); at around 500 ° C, the side chain breaks and decomposition of the macromolecular aromatic fused ring compounds of coal, Generate Aliphatic hydrocarbons, released at the same time 3⁄4. At this stage, the semi-coke which has a significant increase in tar and calorific value is the main product.

 3. The second stage of thermal decomposition (about 600~about 900 °C)

The main reaction is the detachment reaction of the small molecule side chain CH ₃ ) or hydrogen by the polymerization reaction and the aromatic hydrocarbon edge. Gas production has increased significantly. The content of 3⁄4 in the gas increases rapidly, and the volume content of other components is relatively reduced. Under isothermal pyrolysis conditions, oil yield decreases with increasing temperature due to secondary pyrolysis of tar vapor at elevated temperatures. The semi-coke volatiles gradually decrease with increasing temperature, and the fixed carbon content increases. At this stage, a higher yield of gas and a low-volatility, high fixed carbon content of semi-coke are the main products.

 Coal also contains small amounts of elemental nitrogen and sulfur. They also react as follows:

s+o ₂ →so ₂

S0 ₂ +3H ₂ →H ₂ S+2H ₂ 0

N ₂ +3H ₂ →2NH ₃

N ₂ +H ₂ 0+2CO→2HCN+l .50 ₂

NH ₃ + C → HCN + H ₂

CH ₄ + NH ₃ →HCN+3H ₂

Therefore, the products after lignite pyrolysis include lignite semi-coke, gas, water, carbon dioxide, phenols (mainly higher phenols), aliphatic hydrocarbons, ammonia, hydrogen cyanide, pyridines, quinolines, hydrogen sulfide, sulfur dioxide and thiophenes. Wait. Therefore, in the upgrading process of lignite, it is inevitable to encounter the problem of wastewater treatment. However, since the lignite upgrading process is a new type of process in the world, the treatment or reuse method of the wastewater discharged by this process is still blank. Studies have shown that the lignite upgrading process is similar to the coking process. The quality of lignite-purified wastewater is similar to that of coking wastewater after steaming and dephenolization. Coking wastewater is a process of coking, gas distillation, purification and by-product recovery. It produces a high CODcr, high phenol and high ammonia nitrogen containing volatile phenols, polycyclic aromatic hydrocarbons and heterocyclic compounds such as oxygen, sulfur and nitrogen. Industrial organic wastewater treated, which can be divided into two categories: inorganic pollutants and organic pollutants. Among them, inorganic contaminants are generally present in the form of ammonium salts, and in addition to phenolic compounds, organic compounds include aliphatic compounds, heterocyclic compounds, and polycyclic aromatic hydrocarbons. Heterocyclic compounds include diazabenzene, azabiphenyl, azaindole, azaindene, pyridine, quinoline, carbazole, anthracene, etc.; polycyclic compounds include naphthalene, anthracene, phenanthrene, and the like. Organic matter in coking wastewater The content (in terms of COD) is high, and since the organic matter contained in the wastewater is mostly an aromatic compound and a fused ring compound, and a heterocyclic compound such as pyridine, quinoline or hydrazine, the BOD ₅ /COD value is low and the biodegradability is poor. Among them, cyanide, aromatic ring, fused ring and heterocyclic compound are all toxic to microorganisms, and some even in wastewater have exceeded the limit that microorganisms can tolerate.

 At present, the treatment of coking wastewater mainly has the following three processes:

 (1) Delayed two-stage aerobic biological dephenolization process

The process basically consists of a degreasing tank, a regulating tank, a flotation tank, an aeration tank, a secondary sedimentation tank, a coagulation sedimentation tank, and a blower. Ordinary biochemical treatment facilities can effectively remove phenols, cyanide, etc. from coking wastewater. However, due to the limitations of this technology, pollutants such as CODcr, BOD ₅ and ammonia nitrogen in wastewater are difficult to reach.

 (2) Biological nitrogen removal process

 Although the A/0 and A2/0 biological nitrogen removal processes have been applied to a certain range of coking wastewater treatment, it proves that the process technology is relatively advanced and reliable, but there are still many problems, such as large processing structures, high investment, and operation. The cost of infrastructure, bio-nitrogen removal process design infrastructure investment increased by about 30% compared with ordinary 4t treatment.

 (3) Catalytic wet oxidation process

 The cost of this process is equivalent to that of (1), but it requires high temperature and high pressure equipment, which makes it difficult to promote its application.

 It can be seen from the above that even if people adopt the above coking wastewater treatment process in the treatment of lignite upgrading wastewater, the problems caused by the above various processes may occur, and the wastewater generated by the lignite upgrading process contains volatile phenols and polycyclic aromatic hydrocarbons. And an industrial organic wastewater with high CODcr, high phenolic value, high ammonia nitrogen and difficult to treat heterocyclic compounds such as oxygen, sulfur and nitrogen, which produce more wastewater.

 The inventor of the present application has developed such a lignite upgrading wastewater treatment process, that is, using flocculation and sedimentation, and then using the lignite produced by lignite upgrading to adsorb as an adsorbent, and finally adsorbing with activated carbon, although the process is the same as described above. The treatment process is better, but it will result in a long processing flow, a large amount of equipment used for processing, and a large pool. Summary of the invention

In view of this, the object of the present invention is to provide a treatment process for lignite upgrading wastewater, which is cylindrical Process, reduce processing costs. Based on this, the present invention also provides a lignite upgrading system. In order to solve the above technical problem, the technical solution of the present invention is:

 The invention relates to a treatment process for a lignite upgrading wastewater, which comprises: sending a high water vapor content exhaust gas generated during the lignite upgrading process to a burner for incineration, and then feeding the heat transfer medium to the heat medium inlet of the lignite upgrading device.

 Preferably, the method further comprises the steps of: performing a treatment including condensation on the high temperature flue gas discharged from the heat transfer medium outlet of the lignite upgrading device, and recycling the obtained water.

 Preferably, the burner is a burner disposed in a heat transfer medium supply device for providing a heat transfer medium to the lignite upgrading device.

 Preferably, the high-temperature flue gas discharged from the heat-conducting medium outlet of the lignite upgrading device is subjected to residual heat recovery and then condensed or condensed while recovering waste heat.

 Preferably, the exhaust gas obtained after the condensation is subjected to a detoxification treatment including desulfurization and denitration. Preferably, the dust removal treatment is performed before the high water vapor content exhaust gas is sent to the burner for incineration. Preferably, the amount of air distribution during incineration is 50% to 300% of the sufficient combustion oxygen demand of the combustible material. Preferably, the amount of air distribution at the time of incineration is 120% of the sufficient combustion oxygen demand of the combustible material.

 Preferably, the combustion temperature at the time of incineration is controlled at 800 ° C to 1600 ° C.

 Preferably, the combustion temperature at the time of incineration is controlled at 900 ° C to 1200 ° C.

 A lignite upgrading system of the present invention comprises:

 Lignite upgrading device with heat medium inlet;

 a heat transfer medium supply device connected to the heat transfer medium inlet to transport the heat transfer medium to the lignite upgrading device;

 The exhaust end of the lignite upgrading device is in communication with the heat transfer medium supply device, and the high water vapor content exhaust gas discharged from the exhaust end is sent to a burner in the heat transfer medium supply device for incineration.

 Preferably, a recovery processing device is further disposed to communicate with the heat transfer medium outlet of the lignite upgrading device to perform a process including condensation on the high temperature flue gas discharged from the heat transfer medium outlet.

 Preferably, the recovery treatment device performs residual heat recovery on the high temperature flue gas discharged from the heat transfer medium outlet of the lignite upgrading device, and then performs condensation treatment or condensing treatment while recovering waste heat.

Preferably, the recycling treatment device performs the desulfurization and denitration of the exhaust gas obtained after the condensation. Harmless treatment.

 Preferably, the recycling processing device comprises a waste heat boiler device and a flue gas desulfurization device connected in series, the waste heat boiler device condenses high temperature flue gas, and the flue gas desulfurization device performs gas pollutant treatment on the condensed flue gas .

 Preferably, the method further includes a dust removing device, the inlet of the dust removing device is connected to the exhaust end of the lignite upgrading device, the outlet of the dust removing device is connected to the burner, and the exhaust gas to the high water vapor content is sent to the burner Dust removal treatment before incineration.

 Preferably, the dust removing device is a cyclone dust removing device.

 Preferably, the burner includes a burner, a mixing chamber, and a combustion chamber that are sequentially connected.

 Preferably, the burner has a volume smaller than the mixing chamber, and the volume of the mixing chamber is smaller than the combustion chamber. Preferably, the burner comprises a main fuel inlet, a main fuel combustion air inlet, a high water vapor content exhaust gas inlet, an exhaust gas combustion air inlet, wherein the high water vapor content exhaust gas inlet and the lignite upgrading device exhaust End connected.

 Preferably, the burner includes a burner, a mixing chamber, and a combustion chamber that are sequentially connected, and the burner includes a main fuel inlet, a main fuel combustion air inlet, a high water vapor content exhaust gas inlet, and an exhaust gas combustion air inlet, wherein The high water vapor content exhaust gas inlet is connected to an outlet of the dust removal device.

 Preferably, the lignite upgrading device comprises a casing, a feeding end disposed at two ends of the casing, and a discharging end, and at least two stages of exhaust passages are provided from the center of the casing from the inside to the outside, and the exhaust passage is disposed at the outer casing The upper exhaust end is electrically connected; a heat conducting mechanism is disposed in the cavity between the feeding end and the discharging end of the outer casing, and the heat conducting mechanism is provided with a heat conducting medium inlet near the discharging end, near the inlet A heat-conducting medium outlet is disposed at the material end, the heat-conducting mechanism includes a plurality of sets of heat-distributing units spaced apart from each other, the heat-conducting unit includes a plurality of heat-conducting tubes, and the heat-conducting tubes are electrically connected to the heat-conductive medium inlet and the heat-conducting medium outlet, and the adjacent heat conduction A plurality of fins inclined downward from the vertical direction are disposed between the tubes, fins disposed between the heat transfer tubes beside the exhaust passage, and the lower end portion is inclined away from the exhaust passage to block the exhaust passage An exhaust port on the wall.

Compared with the prior art, the treatment process of the lignite upgrading wastewater of the invention is carried out by injecting all the high water vapor content waste gas generated by the lignite upgrading into the burner for incineration, thereby greatly reducing the treatment process and the process used in the process. Less equipment, only need to set up a connecting pipeline between the lignite upgrading device and the burner; thus relative to the first flocculation, re-adsorption, secondary adsorption The process of treating waste water by the incineration method of the present invention is incinerated before the "waste water" is formed, and not only deeply oxidizes various organic pollutants which may bring pollution into a non-polluting gas, and the water vapor subsequently It can be condensed and reused, and because the high-temperature steam is not condensed into liquid water like other sewage treatment processes, and a large amount of liquid water is transported and transported between the processing devices, the treatment process of the present invention saves power, consumables, Pharmacy, labor, these operating costs are considerable.

 The lignite upgrading system of the present invention is configured by the above process, so that the water vapor contained in the high water vapor content exhaust gas is further heated and enters into a gas which is a heat conducting medium for upgrading the lignite, because the specific heat capacity of the water vapor is high. , thereby increasing the heat contained in the unit heat-conducting medium, and at the same time, the heat transfer efficiency between the heat-conducting medium and the lignite is increased due to the mixing of water vapor, thereby increasing the total heat and enhancing the heat transfer. The treatment effect of the lignite upgrading system of the invention is greatly improved, and the improvement can be reflected in the decrease of the energy consumption per unit product or the increase in the processing capacity of a single device or the quality of the product itself.

DRAWINGS

 1 is a flow chart of a treatment process of lignite upgrading wastewater according to the present invention;

 2 is a schematic view showing a preferred embodiment of the treatment process of the lignite upgrading wastewater of the present invention; FIG. 3 is a schematic structural view of a preferred embodiment of the lignite upgrading system of the present invention;

 Figure 4 is a schematic structural view of the nozzle of Figure 3;

 Figure 5 is a perspective view of the lignite upgrading device in the lignite upgrading system of Figure 3. detailed description

 The basic idea of the invention is:

The inventor of the present application considers that when a lignite upgrading system is used for upgrading lignite, it is generally equipped with a gas generator, a burner, and the like. Therefore, the high-vapor content exhaust gas generated by the system is sent to the combustion by utilizing the good flammability of the organic substance. The waste is burned at high temperature (greater than 800 °C), and finally produces non-polluting oxides and water vapor to realize wastewater treatment, that is, the waste gas containing harmful substances is treated before the waste water is produced, and the treatment process is further improved. For the cylinder, and the combustion process generates a large amount of heat, in addition to the system itself, it can also generate electricity, and the resulting water vapor can be Secondary use or condensate recovery can be used for industrial as well as domestic water.

 In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

 Referring to Figure 1, the treatment process of lignite upgrading wastewater includes:

 The high water vapor content exhaust gas is sent to the burner, high temperature incineration is carried out in the burner, and then sent to the heat medium inlet of the lignite upgrading device along with the heat conduction medium, and the high temperature flue gas discharged from the heat conduction medium outlet of the lignite upgrading device is subjected to condensation. The treatment will be used to recycle the water.

 Hereinafter, the treatment process of the lignite upgrading wastewater of the present invention will be described by way of specific examples. Referring to FIG. 2, a flow chart of a preferred embodiment of the treatment process of the lignite upgrading wastewater of the present invention: The treatment process in the embodiment includes:

 The high water vapor content exhaust gas generated at the exhaust end of the lignite upgrading device is sent to the burner through the cyclone dust removal device, and is incinerated in a high temperature in the burner, and enters the lignite upgrading device along with the heat transfer medium to extract the lignite. After the brown coal to be treated in the quality device is treated, it is discharged from the heat transfer medium outlet of the lignite upgrading device, and the discharged high-temperature flue gas is recovered by the waste heat boiler device, and then enters the flue gas desulfurization device to condense the exhaust gas by spraying. The liquid is separated, and the water obtained after the separation can be recycled, and the gas can meet the discharge standard.

 The wastewater generated during the upgrading of lignite is a high water vapor content exhaust gas containing volatile phenols, polycyclic aromatic hydrocarbons and heterocyclic compounds such as oxygen, sulfur and nitrogen. After condensation, it forms high CODcr, high phenolic value, high ammonia nitrogen and 4 An industrial organic wastewater that is difficult to handle. These waste waters exist in the form of a high water vapor content exhaust gas containing combustible gas and organic impurities before being condensed into a liquid state. Therefore, in the present embodiment, the high water vapor is utilized by utilizing self-produced gas and organic impurities with good flammability. The content of the exhaust gas together with the furnace gas is introduced into the combustion chamber, so that the harmful substances in the high water vapor content exhaust gas are incinerated at a high temperature (greater than 800 ° C), and finally a water-insoluble gas and water vapor are formed, followed by condensation and gas-liquid separation. , the harmless treatment of the upgraded wastewater can be realized. The combustion process generates a large amount of heat for power generation in addition to the system itself, and the resulting water vapor is recovered for industrial and domestic use.

 The use of the incineration method of the present embodiment for treating lignite-quality wastewater has the following advantages:

1. Greatly save construction investment and equipment investment in engineering wastewater treatment. Compared with the process of flocculation and sedimentation, and then another adsorption and secondary adsorption, the process is long. The problem of many equipments and large pools is required. The incineration method of this embodiment only needs to increase the burner of the lignite upgrading device and modify some connecting pipelines;

 2. Incineration treatment of lignite upgrading wastewater is incinerated before the formation of "waste water". It not only deeply oxidizes various organic pollutants that may cause pollution into non-polluting gases, but also condenses water vapor. Recycling, because it does not condense high-temperature steam into liquid water like other wastewater treatment processes, and then transports and transports a large amount of liquid water between treatment devices, thereby saving operating costs such as power, consumables, chemicals, labor, etc. The same is very impressive.

 Wherein, the amount of air distribution when incinerating in the burner should be determined according to the oxygen content, and preferably the following conditions should be met: 50% to 300% of the oxygen content of the combustible material is fully burned, and in the process of implementation, according to the combustible substance The amount of oxygen required for full combustion and the amount of oxygen in the air are calculated. If it is equipped with air, the air volume is moderate, with pure oxygen, the air volume is small, and the exhaust gas is equipped with an increased air volume.

 The following is the air volume selection test

 1. Weigh 320kg of brown coal from the Huolin River, which is crushed to the appropriate size, and send it to the lignite upgrading device. The set temperature is 650 °C and the heating starts.

 2. Connect the high water vapor content exhaust gas outlet generated by the lignite upgrading device to the burner self-produced exhaust gas inlet to open the air distribution;

 3. When the test temperature reaches 650 °C, send gas to the burner gas inlet, then ignite the gas, adjust the air distribution, observe the burner exhaust phenomenon, and record the test as follows:

Table 1

 From the above phenomena, we can draw the following conclusions:

Combustion is most adequate and stable when the ratio of fuel to combustion improver is most reasonable, and this is reflected throughout the test. When the air distribution is large, the smoke is dark blue, indicating that the combustion is insufficient, and the organic pollutants are discharged with the exhaust gas. This is because the area of the exhaust gas passage is constant, and the increase of the total air volume increases the wind speed of the exhaust gas, so the exhaust gas cannot be obtained. Full time to burn, in the case of incomplete combustion It has been discharged, which also led to the thick tail odor, which also caused the heat to be released and the heat taken away to increase. The low furnace temperature also confirmed this.

 The small air distribution is reversed. Reasonable fuel and combustion-supporting ratios, slower airflow speeds provide sufficient combustion time, so that these organic pollutants are fully oxidized inside the burner, so the exhaust gas is colorless. At the same time the taste is lighter.

 The amount of air in the distribution provides the link and evidence of this series of changes.

 A preferred embodiment of the lignite shield system of the present invention

 Referring to Fig. 3, Fig. 4, Fig. 5, the lignite upgrading system of the present embodiment comprises eight lignite upgrading devices A and a burner B corresponding to the lignite upgrading device.

 Among them, the burner B includes:

 The burner B1 mixes the main fuel, the high water vapor content exhaust gas, the main fuel combustion air, and the exhaust gas combustion air to form a combustion condition;

 In the air mixing chamber B2, the front end is connected to the burner burner, but the gas from the burner has a certain speed. Therefore, the flame appears in the middle of the mixing chamber, and the second half belongs to the combustion section. The front section basically makes the four gases ejected from the burner as fully mixed as possible;

 In the combustion chamber B3, since the combustion generates high temperature, the gas is inevitably thermally expanded, so that a larger combustion chamber is arranged at the rear of the mixing chamber to make the combustion more complete, and at the same time, a part of the heat transfer medium outlet of the lignite upgrading device is generated. The high-temperature exhaust gas (400 °C) is mixed with the combustion gas (1300 °C) to form a heat-conducting medium of about 700 degrees, and then sent to the lignite upgrading device. This mix has the following benefits:

 1. The waste heat of the exhaust gas at 400 °C can be utilized; 2. Considering the high temperature resistance of the lignite upgrading device itself, it is necessary to reduce the temperature of the heat transfer medium.

4, the burner includes a high water vapor content exhaust gas inlet Bl1, a main fuel inlet B12, a main fuel combustion air (generally air, but may also be oxygen, oxygen-poor exhaust gas, etc.) inlet B13, exhaust gas combustion air inlet B14. Wherein, the high water vapor content exhaust gas inlet B11 communicates with the exhaust end 53 through the steam pipe C, and the exhaust gas discharged from the exhaust end is first dedusted by the cyclone dust removing device D, and then enters the high water vapor content exhaust gas inlet B11 of the burner, the combustion air blower E provides a combustion air to the burner. Since the high steam content waste gas comes from lignite, it will inevitably bring out some fine dust particles, so these fine dust particles are removed by a cyclone dust removal device before combustion. This will bring benefits to the burner and the heat transfer medium circulation pipe, otherwise it will cause ash accumulation on the pipe wall and reduce thermal efficiency. The fine coal particles collected by the cyclone dust removal device can be directly sent to the ball pressing process to be sold as products.

 The high water vapor content exhaust gas enters the burner and burns together with the heat transfer medium, and finally enters the lignite upgrading device, and finally exits from the heat transfer medium outlet of the lignite upgrading device as high temperature flue gas, enters the flue gas pipeline F, and the flue gas pipeline There is a flue gas induced draft fan G. The flue gas pipeline is connected to a recovery treatment device and is condensed by a recovery treatment device. The recycling treatment device comprises a waste heat boiler device connected in series and a flue gas desulfurization device, wherein the waste heat boiler device recovers waste heat from the high temperature flue gas, and the flue gas deaeration device further condenses the condensed flue gas to realize gas-liquid separation.

 The structure of the lignite upgrading device is shown in FIG. 5 , which includes: an outer casing 1 , a feeding hopper 2 disposed above the outer casing 1 , a discharging hopper 3 disposed under the outer casing 1 , and a heat conducting mechanism 4 disposed in the outer casing and disposed in the outer casing 1 The exhaust mechanism 5 in the middle of the body.

The heat conducting mechanism 4 includes a lead-out manifold disposed at the feed hopper 2 for discharging the heat-conducting medium, a plurality of heat-conducting medium lead-out portions 41 connected to the lead-out manifold, and a heat-transfer medium for introducing the heat-conducting medium at the discharge hopper 3. Introducing a manifold, a plurality of heat transfer medium introduction portions 42 connected to the introduction manifold, a plurality of heat transfer tubes 43 connected between the introduction portion and the lead portion, a heat transfer medium introduction portion 42 and a heat transfer medium lead portion 41 provided corresponding thereto A plurality of heat conducting tubes 43 disposed between the two heat conducting tubes are disposed, and a plurality of heat conducting tubes 43 in each of the heat conducting units are uniformly arranged in a parallel direction and at intervals; a moving space of materials is formed between the heat conducting tubes . Wherein, a plurality of fins 44 are disposed between the heat transfer tubes 43 in the longitudinal direction, and the fins 44 are inclined downward at a certain angle in the vertical direction. The fins in this embodiment are divided into first stage fins 44a and second stage fins 44b. Wherein, the first-stage fins 44a are arranged in parallel in the longitudinal direction, and are integrally disposed in the space between the adjacent two heat-conducting tubes, integrally connected with the adjacent two heat-conducting tubes, and the lower end portion thereof is away from the exhaust passage. Tilting, blocking the exhaust port 54 disposed on the exhaust passage near the wall of the heat pipe, so that the gas is discharged from the exhaust port 54 under the action of internal negative pressure, and the solid material remains in the casing under the blocking of the fin Therefore, the primary fin 44a is provided, and its main function is to facilitate the exhaust, and of course, also plays a certain role in turning. In the embodiment, the first-stage fins are arranged in such a manner that each of the first-stage fins at the same height forms a funnel-shaped blanking space with a large diameter and a small diameter. When the material falls, the material is concentrated first, then diffused, and then When it reaches the next height of the fins, it spreads again, so the dynamics are achieved by the fins. The material is transferred so that the heat can be transferred evenly, so that the materials in the outer casing can be processed at a suitable temperature to produce a high quality coal product. As shown in FIG. 5, in this embodiment, the upper end portion of the secondary fin 44b is connected to an adjacent pair of heat transfer tubes, and the lower end portion protrudes beyond the space between the pair of adjacent heat transfer tubes, that is, into the space. In the blanking space between the pair of heat pipes and the four heat pipes adjacent to the pair of heat pipes, secondary fins 44b are also disposed between adjacent heat pipes, and the lower ends of the second fins 44b are also deviated from the vertical Straight into this blanking space. The main function of the secondary fins 44b is to strengthen the turning and heat conduction, so that the heat generated by the heat transfer tubes can be transmitted to the blanking space between the heat conducting tubes, and the temperature of the materials in the blanking space between the heat conducting tubes tends to In the same way, the gases generated by the materials in the various places can be discharged faster.

 Wherein, a plurality of fins are also disposed between the heat-conducting medium introduction portions, so that the materials can be flipped and transferred when they reach the space between the heat-conducting medium introduction portions, so that the gas generated at the place can be discharged in time while maintaining heat transfer. Evenly.

 The feed hopper 2 includes an upper feed section 21, a middle feed section 22, and a lower feed section 23 disposed in the longitudinal direction, wherein the diameter of the middle feed section 22 is smaller than that of the upper feed section 21 and the lower feed section 23. The upper feed section 21 is gradually reduced from top to bottom, and the lower feed section 23 is gradually increased from top to bottom, and the feed hopper 2 provided in such a structure can block the gas and strengthen the lift. Quality effect.

 The discharge hopper 3 comprises an upper discharge section 31 and a lower discharge section 32, and the upper discharge section 31 is composed of a plurality of horizontally arranged distribution hoppers. This arrangement can make the discharge uniform, and does not cause the discharge jam. The situation of coal quality. The lower discharge section 32 is provided with a water-cooling wall outside, and the cooling water circulation is realized by the inlet pipe and the outlet pipe, thereby reducing the discharge temperature, so that the device for the next treatment of the discharge is not damaged by contact with the high-temperature material. In addition, the set hopper can also be used as a transition to prevent high temperature materials from directly contacting the water wall of the lower discharge section.

 The lignite upgrading device in this embodiment further includes a temperature control mechanism disposed at the feeding hopper, the method comprising:

 a temperature sensor (not shown) acquires a temperature signal at each heat transfer medium deriving portion; the controller compares the temperature signal with a preset temperature value, and issues a temperature control command according to the comparison result;

a regulating valve 7 disposed in the outlet portion of each heat conducting unit, adjusted according to a temperature control command Opening degree.

 By setting this temperature control mechanism, the temperature in each of the various outer casings can be adjusted in time to make them consistent, and the temperature is consistent with the set temperature, thereby ensuring the expected product.

 The heat transfer medium deriving portion 41 has a straight shape as a whole, and has a certain inclination at the top thereof, and has a pointed shape. This arrangement can make the blanking smoother.

 The heat transfer medium introduction portion 42 has a straight shape as a whole, and has a certain inclination at the top thereof, and has a pointed shape to facilitate blanking.

 In this embodiment, only the two-stage exhaust passages of the central exhaust passage and the peripheral exhaust passage are provided. In the actual implementation process, according to the number of the heat-conducting tubes provided, from the center of the outer casing, more levels can be set. The exhaust passage allows the gas generated during the heating process to be discharged in time without affecting the quality of the upgrade.

 In this embodiment, each component is disposed toward a target that facilitates blanking and facilitates exhaust gas exhaustion, thereby enabling the temperature of materials in various materials in the blanking space to be flexibly and effectively controlled during the process of treating coal. To achieve a good processing effect. In this embodiment, the heat transfer medium is made of a hot gas.

 The lignite upgrading device in the lignite upgrading system of the present invention is not limited to the foregoing structure, and in other embodiments, any lignite upgrading device using a heat transfer medium for upgrading may be selected.

 In the lignite upgrading system of the present embodiment, the high water vapor content exhaust gas generated by the high temperature incineration is used, and the high water vapor content exhaust gas generated in the upgrading process is sent to the combustion chamber for incineration, and these are contained in the high water vapor content exhaust gas. The water vapor in the water is further heated and enters the gas as a heat-conducting medium (650 ° C). The high specific heat capacity of the water vapor increases the heat contained in the unit heat-transfer medium, and at the same time, the heat-conducting medium is caused by the incorporation of water vapor. The heat transfer efficiency between lignite is increased, so that the total heat is increased and the heat transfer is enhanced, so that the effect of the lignite upgrading system of the present embodiment is greatly improved, and the improvement can be reflected in the unit product. A decrease in energy consumption or an increase in the throughput of a single device or an increase in the quality of the product itself.

The present invention has been described in detail above, and the principles and embodiments of the present invention have been described by way of specific examples. The description of the above embodiments is only for the purpose of understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can also make several improvements and modifications to the present invention without departing from the principles of the invention. And modifications are also intended to fall within the scope of the appended claims.

Claims

Rights request  I. A treatment process for a lignite upgrading wastewater, comprising: sending a high water vapor content exhaust gas generated during the lignite upgrading process to a burner for incineration, and then feeding the lignite upgrading device along with the heat transfer medium; Heat transfer medium inlet.  2. The process for treating lignite upgrading wastewater according to claim 1, further comprising the steps of: performing a treatment including condensation on the high-temperature flue gas discharged from the heat transfer medium outlet of the lignite upgrading device, and obtaining the obtained water. recycle and re-use.  A process for treating lignite upgrading wastewater according to claim 1, wherein said burner is a burner disposed in a heat transfer medium supply means for supplying a heat transfer medium to the lignite upgrading device.  The process for treating lignite upgrading wastewater according to claim 1, characterized in that the high-temperature flue gas discharged from the heat-conducting medium outlet of the lignite upgrading device is subjected to waste heat recovery and then condensed or condensed while recovering waste heat. .  The process for treating brown coal upgrading wastewater according to claim 4, wherein the exhaust gas obtained after the condensation is subjected to detoxification and denitrification.  6. The process for treating lignite upgrading wastewater according to claim 1, characterized in that the dust removal treatment is carried out before the high water vapor content exhaust gas is sent to the burner for incineration.  7. The process for treating lignite upgrading wastewater according to claim 1, wherein the air distribution amount during incineration is 50% to 300% of the sufficient combustion oxygen demand of the combustible material.  The process for treating brown coal upgrading wastewater according to claim 1, characterized in that the amount of air distribution during incineration is 120% of the sufficient combustion oxygen demand of the combustible material.  The process for treating lignite upgrading wastewater according to claim 1, wherein the combustion temperature during incineration is controlled at 800 ° C to 1600 ° C.  The process for treating lignite upgrading wastewater according to claim 1, wherein the combustion temperature at the time of incineration is controlled at 900 ° C to 1200 ° C.  I I, a lignite upgrading system, comprising:  Lignite upgrading device with heat medium inlet; a heat transfer medium supply device, connected to the heat transfer medium inlet, and conveying the heat conductive medium to the lignite upgrading device; The exhaust end of the lignite upgrading device is in communication with the heat transfer medium supply device, and the high water vapor content exhaust gas discharged from the exhaust end is sent to a burner in the heat transfer medium supply device for incineration.  The lignite upgrading system according to claim 11, further comprising a recycling processing device, which is electrically connected to the heat-conducting medium outlet of the lignite upgrading device, and includes high-temperature flue gas discharged from the heat-conducting medium outlet, including condensation. deal with.  The lignite upgrading system according to claim 12, wherein the recovery processing device performs residual heat recovery on the high-temperature flue gas discharged from the heat transfer medium outlet of the lignite upgrading device, and then performs condensation treatment or recovery in waste heat. Condensation treatment is carried out simultaneously.  The lignite upgrading system according to claim 13, wherein the recovery treatment device further performs detoxification and denitration treatment on the exhaust gas obtained after condensation.  The lignite upgrading system according to claim 12, wherein the recovery processing device comprises a waste heat boiler device and a flue gas desulfurization device connected in series, wherein the waste heat boiler device condenses high temperature flue gas, The flue gas removal device treats the condensed flue gas with gaseous pollutants.  The lignite upgrading system according to claim 11, further comprising a dust removing device, wherein an inlet of the dust removing device is connected to an exhaust end of the lignite upgrading device, and an outlet of the dust removing device The burner is connected to the dust, and the high water vapor content is dedusted before being sent to the burner for incineration.  The lignite upgrading system according to claim 16, wherein the dust removing device is a cyclone dust removing device.  The lignite upgrading system according to claim 11, wherein the burner comprises a burner, a mixing chamber, and a combustion chamber that are sequentially connected.  The lignite upgrading system according to claim 18, wherein the burner has a smaller volume than the mixing chamber, and the volume of the mixing chamber is smaller than the combustion chamber. The lignite upgrading system according to claim 18, wherein the burner comprises a main fuel inlet, a main fuel combustion air inlet, a high water vapor content exhaust gas inlet, an exhaust gas combustion air inlet, wherein the burner The water vapor content exhaust gas inlet is in communication with the exhaust end of the lignite upgrading device. The lignite upgrading system according to claim 16, wherein the burner comprises a burner, a mixing chamber, and a combustion chamber that are sequentially connected, and the burner includes a main fuel inlet and a main fuel combustion air inlet. a high water vapor content exhaust gas inlet, an exhaust gas combustion air inlet, wherein the high water vapor content exhaust gas inlet is connected to an outlet of the dust removing device.  The lignite upgrading system according to claim 11, wherein the lignite upgrading device comprises a casing, a feeding end and a discharging end respectively disposed at two ends of the casing, and at least a center from the center of the casing a two-stage exhaust passage, the exhaust passage being electrically connected to an exhaust end disposed on the outer casing; a heat conducting mechanism disposed in the cavity between the feeding end and the discharging end of the outer casing, the heat conducting mechanism Providing a heat-conducting medium inlet near the discharge end, and providing a heat-conducting medium outlet near the feeding end, the heat-conducting mechanism comprising a plurality of sets of spaced-apart heat-dissipating units, the heat-conducting unit comprising a plurality of heat-conducting tubes, the heat conducting The tube is electrically connected to the inlet of the heat-conducting medium and the outlet of the heat-conducting medium, and a plurality of fins inclined downward from the vertical direction are arranged between the adjacent heat-conducting tubes, and fins disposed between the heat-conducting tubes beside the exhaust passage, the lower end The portion is inclined away from the exhaust passage to block the exhaust port formed on the wall surface of the exhaust passage.