CN114832613A - Coal chemical industry high-temperature dust-containing VOCs treatment system and method - Google Patents
Coal chemical industry high-temperature dust-containing VOCs treatment system and method Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 37
- 239000000126 substance Substances 0.000 title claims abstract description 33
- 238000011282 treatment Methods 0.000 title claims abstract description 24
- 239000003245 coal Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 57
- 244000005700 microbiome Species 0.000 claims abstract description 56
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003546 flue gas Substances 0.000 claims abstract description 55
- 238000000197 pyrolysis Methods 0.000 claims abstract description 53
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000011221 initial treatment Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000001179 sorption measurement Methods 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 24
- 230000000813 microbial effect Effects 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 238000001754 furnace pyrolysis Methods 0.000 claims description 10
- 235000015097 nutrients Nutrition 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 claims description 6
- 238000009629 microbiological culture Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 238000009776 industrial production Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims 1
- 239000003077 lignite Substances 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000009257 reactivity Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012412 chemical coupling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000011573 trace mineral Substances 0.000 description 1
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention discloses a system and a method for treating high-temperature dust-containing VOCs in coal chemical industry. According to the invention, lignite is pyrolyzed, generated high-temperature dust-containing flue gas is dedusted by a multi-stage high-temperature cyclone separator, VOCs are removed by using a microorganism treatment method, microorganism slurry distributors and flue gas distributors are arranged in a staggered manner, and microorganism slurry is sprayed from bottom to top, so that a liquid curtain can be formed by combining the microorganism slurry distributors and the flue gas, the contact time of the microorganism slurry and the flue gas is prolonged, and the reaction rate is increased. In addition, the flue gas after the primary treatment utilizes the powdery pyrolysis semicoke to carry out secondary removal of VOCs, so that the removal efficiency of the VOCs can be improved, and the reactivity of the semicoke can also be improved. Finally, the pyrolysis semicoke after adsorbing the VOCs is introduced into an industrial boiler to be combusted, and the system can simultaneously produce various chemical products such as pyrolysis semicoke, heat energy and steam.
Description
Technical Field
The invention belongs to the field of gas treatment of coal chemical coupling VOCs, and particularly relates to a system and a method for treating high-temperature dust-containing VOCs in coal chemical.
Background
The coal chemical means is a common lignite utilization means, can improve the utilization efficiency of energy, and can realize the poly-generation of the coal chemical industry. However, the high-temperature dust-containing flue gas generated in the process of producing the pyrolysis semicoke by pyrolyzing the lignite contains VOCs, which has great influence on the health of human bodies, so that the high-temperature dust-containing flue gas can be emptied after being treated. Microbial treatment is a common means for degrading VOCs in recent years, but cannot achieve high adsorption efficiency.
Disclosure of Invention
The invention aims to provide a system and a method for treating high-temperature dust-containing VOCs in coal chemical industry aiming at the defects of the prior art.
The invention is realized by adopting the following technical scheme:
a coal chemical industry high temperature dust-containing VOCs treatment system comprises a microorganism culture tank, a multi-stage high temperature cyclone separator, a slurry tank, a gas distributor, a microorganism slurry distributor and a pyrolysis semicoke adsorption reactor; the high-temperature dust-containing tail flue gas produced by pyrolysis of a blast furnace for producing pyrolysis semicoke is introduced into the multistage high-temperature cyclone separator, the dedusted flue gas is introduced into the gas distributor, so that the flue gas is contacted with microorganisms in the microorganism slurry distributor, and VOCs in the flue gas are purified and treated by utilizing the microorganisms; the flue gas after primary treatment is introduced into a pyrolysis semicoke adsorption reactor, and the pyrolysis semicoke generated by blast furnace pyrolysis is used for adsorbing VOCs in the flue gas, so that secondary treatment of the flue gas is realized; introducing the pyrolysis semicoke subjected to the adsorption of the VOCs into an industrial boiler for combustion treatment; the slurry tank is arranged below the gas distributor and is used for sending the microorganism slurry back to the microorganism culture tank.
The invention has the further improvement that 4 sub-cyclone separators are arranged in parallel in the multi-stage high-temperature cyclone separator, the number of the sub-cyclone separators which are started is determined by detecting the gas flow, the dust removal efficiency of the cyclone separators is further improved, and the energy consumption can be reduced by controlling the number of the sub-cyclone separators which are started.
The invention has the further improvement that the microbial slurry circulates between the microbial culture pool and the slurry pool through a booster pump and a circulating pump, and the microbial slurry which participates in the treatment of VOCs is continuously put into circulation after being supplemented with microbial strains, nutrient solution and air in the microbial culture pool.
The invention is further improved in that the microorganism slurry is sprayed from the bottom through the microorganism slurry distributor, and undergoes two return strokes of ascending and descending to form a liquid curtain, so that the contact surface and the contact time with VOCs are increased, and the reaction process is strengthened.
The invention has the further improvement that the gas distributor and the microorganism slurry distributor are arranged in a staggered way, so that the microorganism slurry can be fully contacted with the flue gas, and the efficiency of removing VOCs in the flue gas by the microorganism slurry is further improved.
The further improvement of the invention is that the flue gas after the primary treatment of microbial adsorption is introduced into a pyrolysis semicoke adsorption reactor, and the powdery pyrolysis semicoke generated by blast furnace pyrolysis is used for adsorbing residual VOCs in the flue gas; and the pyrolysis semicoke adsorption reactor adopts the design of rotation, can improve the adsorption efficiency of system through increasing the powder feeding volume and the rotational speed of semicoke.
The further improvement of the invention is that the combustion characteristic and the reaction activity of the powdery pyrolysis semicoke after absorbing VOCs are enhanced, and the powdery pyrolysis semicoke can be put into an industrial boiler for combustion to produce and obtain heat energy and steam chemical products; and the blocky pyrolytic semicoke obtained by high-temperature pyrolysis is collected as a chemical product.
A coal chemical industry high-temperature dust-containing VOCs treatment method comprises the following steps:
the VOCs in the flue gas are coupled and treated by two modes of a microbial treatment method and a pyrolysis semicoke adsorption method, and the semicoke adsorbing the VOCs is put into an industrial boiler for combustion, so that the VOCs in the flue gas can be adsorbed, and the industrial production efficiency can be improved;
meanwhile, the gas distributors and the microorganism slurry distributors are arranged in a staggered mode and the microorganism slurry distributors are assisted with the mode of spraying microorganism slurry from the bottom, so that the contact surface and the contact time with VOCs are increased, and the reaction process is strengthened;
utilize 4 sub cyclone to constitute multistage high temperature cyclone, send into gas distributor with the high temperature dust-laden afterbody flue gas of blast furnace pyrolysis production pyrolysis semicoke, reduce the energy consumption of dust remover when improving dust collection efficiency.
The invention has at least the following beneficial technical effects:
the invention provides a system and a method for treating high-temperature dust-containing VOCs in coal chemical industry. According to the invention, lignite is pyrolyzed, generated high-temperature dust-containing flue gas is dedusted by a multi-stage high-temperature cyclone separator, VOCs are removed by using a microorganism treatment method, microorganism slurry distributors and flue gas distributors are arranged in a staggered manner, and microorganism slurry is sprayed from bottom to top, so that a liquid curtain can be formed by combining the microorganism slurry distributors and the flue gas, the contact time of the microorganism slurry and the flue gas is prolonged, and the reaction rate is increased. In addition, the flue gas after the primary treatment utilizes the powdery pyrolysis semicoke to carry out secondary removal of VOCs, so that the removal efficiency of the VOCs can be improved, and the reactivity of the semicoke can also be improved. Finally, the pyrolysis semicoke after adsorbing the VOCs is introduced into an industrial boiler to be combusted, and the system can simultaneously produce various chemical products such as pyrolysis semicoke, heat energy and steam.
In conclusion, the high-temperature pyrolysis furnace, the VOCs treatment system and the industrial boiler are coupled into one industrial system, industrial products such as steam, heat energy, pyrolysis semicoke and the like can be produced, chemical poly-generation is realized, VOCs in high-temperature flue gas are removed through the cooperation of various industrial devices, and the industrial production efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a system for treating high-temperature dust-containing VOCs in coal chemical industry according to the present invention.
FIG. 2 is a schematic view of the arrangement of the gas distributor and the microbial slurry distributor.
Description of reference numerals:
1 is a microorganism culture pond, 2 is a booster pump, 3 is a multistage high-temperature cyclone separator, 4 is a circulating pump, 5 is a slurry pond, 6 is a gas distributor, 7 is a microorganism slurry distributor, and 8 is a pyrolysis semicoke adsorption reactor.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the high-temperature dust-containing VOCs treatment system in the coal chemical industry provided by the invention comprises a microorganism culture tank 1, a booster pump 2, a multistage high-temperature cyclone separator 3, a circulating pump 4, a slurry tank 5, a gas distributor 6, a microorganism slurry distributor 7 and a pyrolysis semicoke adsorption reactor 8. FIG. 2 is a schematic view of the arrangement of the gas distributor and the microbial slurry distributor.
Wherein, the dust-containing flue gas at the tail part of the high temperature for producing the pyrolysis semicoke by the pyrolysis of the blast furnace is introduced into a multi-stage high-temperature cyclone separator 3, and the flue gas after dust removal is introduced into a gas distributor 6, so that the flue gas is contacted with microorganisms, and the microorganisms are utilized to purify and treat VOCs in the flue gas; the flue gas after primary treatment is introduced into a pyrolysis semicoke adsorption reactor 8, the pyrolysis semicoke generated by blast furnace pyrolysis is used for adsorbing VOCs in the flue gas, and finally the flue gas after secondary treatment can be subjected to other procedures and then is emptied; and introducing the pyrolysis semicoke subjected to the adsorption of the VOCs into an industrial boiler for combustion treatment.
Preferably, a total of 4 sub-cyclones are arranged in parallel in the multi-stage high-temperature cyclone 3, the number of the sub-cyclones which are started is determined by detecting the gas flow, the dust removal efficiency of the cyclone can be improved, and the energy consumption can be reduced by controlling the number of the sub-cyclones which are started.
Preferably, the microorganism slurry is circulated between the microorganism culture tank 1 and the slurry tank 5 through a booster pump 2 and a circulating pump 4, and the microorganism slurry after being involved in the treatment of the VOCs is continuously circulated after being supplemented with microorganism strains, nutrient solution and air in the microorganism culture tank 1 and then being cultured. Wherein the microbial slurry consists of microbial strains, nutrient solution and air. The microbial strain is the existing bacteria, fungi and protozoa, the nutrient solution contains inorganic salt nutrient substances such as nitrogen, phosphorus, sulfur, trace elements and the like, and also contains some buffer substances to maintain the stability of the pH value.
Preferably, the microorganism slurry is sprayed from the bottom, and undergoes two return strokes of ascending and descending to form a liquid curtain, so that the contact surface and the contact time with the VOCs are increased, and the reaction process is enhanced.
Preferably, the gas distributor 6 and the microorganism slurry distributor 7 are arranged in a staggered manner, so that the microorganism slurry can be fully contacted with the flue gas, and the efficiency of removing VOCs in the flue gas by the microorganism slurry is improved.
Preferably, the flue gas after the primary treatment of microbial adsorption is introduced into a pyrolysis semicoke adsorption reactor 8, and residual VOCs in the flue gas are adsorbed by powdery pyrolysis semicoke generated by blast furnace pyrolysis; and the pyrolysis semicoke adsorption reactor 8 adopts a rotary design, and the adsorption efficiency of the system can be improved by increasing the powder feeding amount and the rotating speed of the semicoke.
Preferably, the combustion characteristics and the reaction activity of the powdery pyrolysis semicoke after absorbing the VOCs are enhanced, and the powdery pyrolysis semicoke can be put into an industrial boiler for combustion to produce chemical products such as heat energy, steam and the like; and the blocky pyrolytic semicoke obtained by high-temperature pyrolysis can be directly collected as a chemical product.
Referring to fig. 1, the method for treating high-temperature dust-containing VOCs in coal chemical industry provided by the invention comprises the following steps:
through the coupling of a high-temperature furnace, an industrial boiler, a microorganism culture tank 1, a slurry tank 5 and a pyrolysis semicoke adsorption reactor 8, various industrial products such as pyrolysis semicoke, heat energy, steam and the like are produced simultaneously;
the VOCs in the flue gas are coupled and treated by two modes of a microbial treatment method and a pyrolysis semicoke adsorption method, and the semicoke adsorbing the VOCs is put into an industrial boiler for combustion, so that the VOCs in the flue gas can be effectively adsorbed, and the industrial production efficiency can be improved;
the gas distributors 6 and the microorganism slurry distributors 7 are arranged in a staggered manner to assist in the mode of spraying microorganism slurry from the bottom, so that the contact surface and the contact time with VOCs are increased, and the reaction process is strengthened;
utilize 4 sub cyclone to constitute multistage high temperature cyclone 3, send into gas distributor 6 with the high temperature afterbody dusty flue gas of blast furnace pyrolysis production pyrolysis semicoke, also can reduce the energy consumption of dust remover when improving dust collection efficiency.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those skilled in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A coal chemical industry high-temperature dust-containing VOCs treatment system is characterized by comprising a microorganism culture tank (1), a multi-stage high-temperature cyclone separator (3), a slurry tank (5), a gas distributor (6), a microorganism slurry distributor (7) and a pyrolysis semicoke adsorption reactor (8); wherein the content of the first and second substances,
a microbial strain inlet, a nutrient solution inlet and an air inlet are formed in the microbial culture tank (1), an outlet of the microbial culture tank (1) is connected to an inlet of a microbial slurry distributor (7), high-temperature dust-containing tail flue gas generated in pyrolysis semicoke production by blast furnace pyrolysis is introduced into the multistage high-temperature cyclone separator (3), the flue gas subjected to dust removal is introduced into the gas distributor (6), so that the flue gas is contacted with middle microorganisms in the microbial slurry distributor (7), and VOCs in the flue gas are purified and treated by using microorganisms; the flue gas after primary treatment is introduced into a pyrolysis semicoke adsorption reactor (8), and the pyrolysis semicoke generated by blast furnace pyrolysis is used for adsorbing VOCs in the flue gas to realize secondary treatment of the flue gas; introducing the pyrolysis semicoke subjected to the adsorption of the VOCs into an industrial boiler for combustion treatment; the slurry tank (5) is arranged below the gas distributor (6) and is used for sending the microorganism slurry back to the microorganism culture tank (1).
2. The coal chemical industry high-temperature dust-containing VOCs processing system according to claim 1, wherein 4 sub-cyclones are arranged in parallel in the multi-stage high-temperature cyclone (3), the number of the sub-cyclones is determined by detecting the gas flow, so that the dust removal efficiency of the cyclones is improved, and the energy consumption can be reduced by controlling the number of the sub-cyclones.
3. The system for treating high-temperature dust-containing VOCs in coal chemical industry according to claim 1, wherein the microbial slurry is circulated between the microbial culture tank (1) and the slurry tank (5) through a booster pump (2) and a circulating pump (4), and the microbial slurry after being involved in VOCs treatment is fed into the circulation continuously through cultivation after microbial strains, nutrient solution and air are supplemented in the microbial culture tank (1).
4. The system for treating high-temperature dust-containing VOCs in coal chemical industry according to claim 1, wherein the microorganism slurry is injected from below through the microorganism slurry distributor (7) and undergoes two return strokes of ascending and descending to form a liquid curtain, so that the contact surface and the contact time with the VOCs are increased, and the reaction process is enhanced.
5. The coal chemical industry high-temperature dust-containing VOCs processing system according to claim 1, wherein the gas distributors (6) and the microorganism slurry distributors (7) are arranged in a staggered manner, so that microorganism slurry and flue gas can be fully contacted, and further, the efficiency of removing VOCs in flue gas by microorganism slurry is improved.
6. The system for treating high-temperature dust-containing VOCs in coal chemical industry according to claim 1, wherein flue gas after primary treatment by microbial adsorption is introduced into a pyrolysis semicoke adsorption reactor (8), and residual VOCs in the flue gas are adsorbed by using powdery pyrolysis semicoke generated by blast furnace pyrolysis; and the pyrolysis semicoke adsorption reactor (8) adopts a rotary design, so that the adsorption efficiency of the system can be improved by increasing the powder feeding amount and the rotating speed of the semicoke.
7. The system for treating high-temperature dust-containing VOCs in coal chemical industry according to claim 1, wherein the combustion characteristics and reaction activity of the pulverized pyrolysis semicoke after absorbing VOCs are enhanced, and the pulverized pyrolysis semicoke can be put into an industrial boiler for combustion to produce heat energy and steam chemical products; and the blocky pyrolytic semicoke obtained by high-temperature pyrolysis is collected as a chemical product.
8. A coal chemical industry high temperature dust-containing VOCs treatment method is characterized by comprising the following steps:
the VOCs in the flue gas are coupled and treated by two modes of a microbial treatment method and a pyrolysis semicoke adsorption method, and the semicoke adsorbing the VOCs is put into an industrial boiler for combustion, so that the VOCs in the flue gas can be adsorbed, and the industrial production efficiency can be improved;
meanwhile, the gas distributors (6) and the microorganism slurry distributors (7) are arranged in a staggered manner to assist in the mode of spraying microorganism slurry from the bottom, so that the contact surface and the contact time with VOCs are increased, and the reaction process is strengthened;
utilize 4 sub cyclone to constitute multistage high temperature cyclone (3), send into gas distributor (6) with the high temperature dust-laden afterbody flue gas of blast furnace pyrolysis production pyrolysis semicoke, reduce the energy consumption of dust remover when improving dust collection efficiency.
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| KR20010080790A (en) * | 1999-12-30 | 2001-08-25 | 조 정 래 | Bio-Trickling-Filter System for Eliminating a Stench and VOCs |
| CN201020339Y (en) * | 2007-04-06 | 2008-02-13 | 东南大学 | Smoke simultaneity desulfurization denitration integrative double-stage liquid column type absorption reactor |
| CN107213781A (en) * | 2017-07-06 | 2017-09-29 | 山东三融环保工程有限公司 | The purifier and purification method of a kind of denitrifier removing flue gas nitrogen oxide |
| CN208553742U (en) * | 2018-06-01 | 2019-03-01 | 广州天巽环保科技有限公司 | One kind being used for the multi-level biological cleaning processing unit of organic exhaust gas |
| CN111591986A (en) * | 2020-04-10 | 2020-08-28 | 山东大学 | Plant VOCs treatment method and system based on petrochemical enterprise byproduct petroleum coke upgrading utilization |
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