CN114811618A - Comprehensive treatment method for standard emission of coking tail gas - Google Patents
Comprehensive treatment method for standard emission of coking tail gas Download PDFInfo
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- CN114811618A CN114811618A CN202210351480.0A CN202210351480A CN114811618A CN 114811618 A CN114811618 A CN 114811618A CN 202210351480 A CN202210351480 A CN 202210351480A CN 114811618 A CN114811618 A CN 114811618A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000011282 treatment Methods 0.000 title claims abstract description 31
- 238000004939 coking Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 136
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 51
- 230000023556 desulfurization Effects 0.000 claims abstract description 51
- 239000002912 waste gas Substances 0.000 claims abstract description 39
- 238000005406 washing Methods 0.000 claims abstract description 29
- 239000010815 organic waste Substances 0.000 claims abstract description 24
- 238000009279 wet oxidation reaction Methods 0.000 claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 claims abstract description 20
- 230000008929 regeneration Effects 0.000 claims abstract description 18
- 238000011069 regeneration method Methods 0.000 claims abstract description 18
- 239000000446 fuel Substances 0.000 claims abstract description 17
- 239000000571 coke Substances 0.000 claims abstract description 16
- 238000000746 purification Methods 0.000 claims abstract description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 60
- 239000003034 coal gas Substances 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 14
- 229910021529 ammonia Inorganic materials 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 1
- 239000001569 carbon dioxide Substances 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 238000004821 distillation Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002808 molecular sieve Substances 0.000 description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- -1 benzene and phenols Chemical class 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000009615 deamination Effects 0.000 description 2
- 238000006481 deamination reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011221 initial treatment Methods 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/14—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 absorption
- B01D53/1487—Removing organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
- C10K1/18—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids hydrocarbon oils
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/32—Purifying combustible gases containing carbon monoxide with selectively adsorptive solids, e.g. active carbon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/006—General arrangement of incineration plant, e.g. flow sheets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/205—Other organic compounds not covered by B01D2252/00 - B01D2252/20494
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/40—Absorbents explicitly excluding the presence of water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/103—Supplementary heating arrangements using auxiliary fuel gaseous or liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Analytical Chemistry (AREA)
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Abstract
The invention discloses a comprehensive treatment method for standard-reaching emission of coking tail gas, which combines a negative-pressure debenzolization unit, a wet oxidation method desulphurization regeneration tail gas treatment unit and a gas fine desulphurization unit in a coke oven gas purification area with a tubular furnace system, wherein purified gas treated by the gas fine desulphurization unit is used as a main fuel of the tubular furnace, organic waste gas of the negative-pressure debenzolization unit is used as an auxiliary fuel of the tubular furnace and enters a waste gas burner for combustion, tail gas treated by a wet oxidation method desulphurization regeneration tail gas through an ammonia washing system is used as combustion-supporting air of the tubular furnace, the air quantity is insufficient and is supplemented by air, and the tail gas combusted by the tubular furnace meets the standard-reaching emission requirement and is directly emitted. The organic waste gas of the debenzolization unit and the regeneration tail gas of the wet oxidation desulfurization unit are introduced into the tubular heating furnace for incineration treatment, and the hydrocarbon in the waste gas is decomposed into harmless water and carbon dioxide under the action of high temperature.
Description
Technical Field
The invention belongs to the technical field of coking, and particularly relates to a comprehensive treatment method for standard emission of coking tail gas.
Background
The coke oven gas purification area generally comprises a raw gas cooling and discharging device, a gas desulfurization device, a gas deamination device, a gas debenzolization device and a gas fine desulfurization device.
The coal gas desulfurization usually adopts a wet oxidation desulfurization process, the regeneration tail gas generated by a regeneration tower contains ammonia, hydrogen sulfide, oxygen and the like, and the tail gas after washing is difficult to ensure the standard emission. The waste gas contains various organic compounds such as benzene and phenols, and the like, and the waste gas directly discharges to cause air pollution, and further needs to be adsorbed or combusted. The content of hydrogen sulfide in coke oven gas adopted by a debenzolization tower and a tubular furnace in a tar distillation area of a coke-oven plant is often higher than 200mg/m 3 And the sulfur dioxide content in the flue gas generated after the flue gas directly enters the tubular furnace for combustion and emission can not meet the emission standard.
With the stricter environmental protection requirement, an efficient and energy-saving comprehensive treatment method for the standard-reaching emission of tail gas in a coke oven gas purification area is sought, and the method has important practical significance.
Disclosure of Invention
Aiming at the problem which needs to be solved urgently in the existing coke oven gas purification area, according to the embodiment of the invention, a brand new comprehensive treatment method which can effectively solve the environmental pollution and is used for standard emission of coking tail gas is hopefully provided.
According to the embodiment, the invention provides a comprehensive treatment method for standard-reaching emission of coking tail gas, which combines a negative-pressure debenzolization unit, a wet oxidation desulfurization regeneration tail gas treatment unit and a gas fine desulfurization unit in a coke oven gas purification area with a tubular furnace system, wherein the clean gas treated by the gas fine desulfurization unit is used as a main fuel of the tubular furnace, organic waste gas of the negative-pressure debenzolization unit is used as an auxiliary fuel of the tubular furnace and enters a waste gas burner for combustion, tail gas treated by a water ammonia washing system of the wet oxidation desulfurization regeneration tail gas is used as combustion-supporting air of the tubular furnace, the gas quantity is insufficient and is supplemented by air, and the tail gas after combustion of the tubular furnace meets the standard-reaching emission requirement and is directly emitted.
Preferably, the tube furnace burner adopts a professional waste gas burner and consists of a waste gas burner and a main burner.
Preferably, the negative pressure debenzolization unit adopts a washing oil circulating injection negative pressure pumping system, and organic waste gas obtained after the vacuum non-condensing and crude benzene tank area VOC tail gas of the negative pressure debenzolization tower is circularly washed by the washing oil enters a waste gas inlet of a waste gas burner of the tube furnace.
Preferably, the coal gas fine desulfurization unit is used for obtaining the clean coal gas after desulfurization, ammonia removal and benzene washing through molecular sieve adsorption treatment to obtain the coal gas with the sulfur content of not more than 1mg/m 3 Fine desulfurized gas.
Preferably, the tail gas of the wet oxidation desulfurization unit is used as combustion air of the waste gas burner.
Preferably, when the wet oxidation desulfurization process is not employed, air is entirely used as the combustion air for the tube furnace.
Due to the adoption of the technical scheme, compared with the prior art, the comprehensive treatment method for standard-reaching discharge of coking tail gas has the following characteristics:
1. burning the organic waste gas in the debenzolization area through a waste gas burner of the tubular furnace, decomposing most organic matters in the waste gas burner, and allowing the generated high-temperature flue gas to enter a main burner to decompose the residual organic matters for the second time, so that an adsorption or combustion device for treating the organic waste gas is omitted, and the investment is reduced; on the other hand, the organic waste gas is used as the auxiliary fuel of the tube furnace, so that the consumption of main fuel coke oven gas can be reduced.
2. The negative pressure debenzolization tower adopts the washing oil circulation jet negative pressure debenzolization technology, so that on one hand, the negative pressure debenzolization saves energy consumption compared with the normal pressure debenzolization; on the other hand, VOC tail gas in the crude benzene system can be subjected to primary treatment through washing oil circulating injection and then enters the tubular furnace for combustion, so that the total VOC load of the RTO regenerative combustion furnace entering the plant is reduced.
3. The regenerated tail gas of the wet oxidation desulfurization process is used as combustion-supporting air of the tubular furnace, so that the problem of emission and treatment of the regenerated tail gas is solved.
4. The coal gas after the molecular sieve adsorption and fine desulfurization is used as the main fuel of the tubular furnace, and a source control method is utilized, so that the problems of multiple treatment points, high investment, large occupied area and the like in the conventional tail end treatment mode are solved, and the standard emission of the flue gas of the tubular furnace is realized; on the other hand, the low-sulfur coke oven gas can prevent the low-temperature dew point corrosion at the top of the tubular furnace.
5. The tubular furnace is used as the main combustion device of the method, is particularly suitable for a coking plant containing a tubular furnace system, can realize comprehensive treatment of coking tail gas only by modifying the existing tubular furnace burner into a professional waste gas burner, and has low modification cost.
6. The method has reasonable resource allocation, does not need to increase equipment, has low modification cost and good environmental protection effect, and effectively meets the requirement of standard emission of the coking waste gas.
Drawings
FIG. 1 is a process diagram of the comprehensive treatment method for standard emission of coking tail gas.
Wherein: part A is a tubular furnace combustion system; part B is a negative pressure debenzolization unit; the part C is a coal gas fine desulfurization unit; and the part D is a wet oxidation desulfurization regeneration tail gas treatment unit.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples. These examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure in any way whatsoever. After reading the description of the invention, one skilled in the art can make various changes and modifications to the invention, and such equivalent changes and modifications also fall into the scope of the invention defined by the claims.
As shown in fig. 1, according to the comprehensive treatment method for standard-reaching emission of coking tail gas provided in the subsequent embodiment of the present invention, a negative-pressure debenzolization unit (part B), a wet oxidation desulfurization regeneration tail gas treatment unit (part D), and a gas fine desulfurization unit (part C) in a coke oven gas purification area are combined with a tubular furnace system (part a), clean gas treated by the gas fine desulfurization unit is used as a tubular furnace main fuel, organic waste gas of the negative-pressure debenzolization unit is used as a tubular furnace secondary fuel and enters a waste gas burner for combustion, tail gas treated by the wet oxidation desulfurization regeneration tail gas through a water ammonia scrubbing system is used as combustion-supporting air of the tubular furnace, the gas amount is insufficient and is supplemented by air, and the tail gas combusted by the tubular furnace meets the standard-reaching emission requirement and is directly emitted.
The tube furnace burner adopts a professional waste gas burner and consists of a waste gas burner and a main burner.
The negative pressure debenzolization unit adopts a washing oil circulating injection negative pressure pumping system, and organic waste gas obtained after vacuum non-condensing of the negative pressure debenzolization tower and VOC tail gas in a crude benzene tank area are circularly washed by washing oil enters a waste gas inlet of a waste gas burner of the tubular furnace.
The fine coal gas desulfurization unit is used for adsorbing the purified coal gas subjected to desulfurization, deammoniation and benzene washing to obtain the coal gas containing no more than 1mg/m of sulfur 3 Fine desulfurized gas.
And tail gas of the wet oxidation desulfurization unit is used as combustion air of the waste gas burner.
When the wet oxidation desulfurization process is not adopted, air is completely adopted as combustion-supporting air of the tube furnace.
The invention provides a comprehensive treatment method for standard emission of coking tail gas, which comprises the following specific working steps:
the part A of the tube furnace system is the main part of the method, and the organic waste gas and the regenerated tail gas in the gas purification area are collected in a combustor of the tube furnace.
In the part B, rich oil of coke oven gas after lean oil washing and debenzolization is subjected to negative pressure debenzolization, a negative pressure debenzolization tower generates negative pressure by an oil washing circulating injection negative pressure pumping system, a vacuum pump is not adopted for pumping the negative pressure, the defects that a pump body is easy to corrode and circulating liquid is frequently replaced in the vacuum pump negative pressure pumping technology can be avoided, meanwhile, organic waste gas in a crude benzene tank area can be introduced into the circulating injection system, benzene and the like in the waste gas are recovered by oil washing and washing, and the organic waste gas generated in the part B flows to a part A tubular furnace waste gas burner by a fan or automatically.
In the part C, clean gas obtained by subjecting raw coke oven gas to gas primary cooling, gas desulfurization, gas deamination and gas benzene washing is sent to a molecular sieve adsorption fine desulfurization system for further purification, and the content of hydrogen sulfide in the coke oven gas is adsorbed to be not more than 1mg/m 3 And the fine desulfurization gas is sent to the main gas inlet of the A part of tubular furnace and is used as the main fuel of the tubular furnace, so that the content of sulfur dioxide in the flue gas of the tubular furnace is controlled from the source, and the standard emission requirement of the tubular furnace can be met.
In the part D, when the wet oxidation desulfurization process is adopted in the coal gas desulfurization of the coal gas purification unit, the regenerated tail gas generated by the regeneration tower contains ammonia, hydrogen sulfide and 20-25% of oxygen, most of ammonia is removed from the regenerated tail gas through the primary treatment of the water washing tower, the regenerated tail gas can be sent to the part A of tubular furnace waste gas burner nozzles to be used as combustion-supporting air, and the insufficient part is complemented by fresh air, so that the problem of the outlet of the regenerated tail gas is solved, the regenerated tail gas is not required to be treated through three-stage washing processes of acid washing, alkali washing and water washing, and the use amount of the fresh air can be reduced; if the coal gas desulfurization is carried out by adopting an absorption method, no regenerated tail gas exists, no part D exists, and the combustion-supporting air of the tubular furnace is all fresh air.
The design principle of the comprehensive treatment method for standard emission of coking tail gas provided by the subsequent embodiment of the invention is as follows: organic waste gas generated in the negative pressure debenzolization area contains organic compounds such as benzene and phenols, the organic waste gas is introduced into the tubular heating furnace for incineration treatment, and in order to prevent the waste gas from influencing the main flame of the tubular heating furnace, the burner of the tubular heating furnace is improved, and waste gas burners are added. Therefore, the organic waste gas is combusted through the waste gas burner of the tube furnace, most organic matters in the waste gas can be decomposed in the waste gas burner, and the generated high-temperature flue gas enters the main burner to secondarily decompose the residual organic matters so as to be completely combusted; and the high-temperature flue gas that the waste gas nozzle produced not only can not impact main flame, can also form the intense heat mixture to main fuel with the flame in the main nozzle together, helps the combustion stability of main flame. Oxygen contained in the regeneration tail gas can be used as combustion air.
Through the organic combination of the negative pressure debenzolization unit (part B), the wet oxidation desulfurization regeneration tail gas treatment unit (part D), the coal gas fine desulfurization unit (part C) and the tubular furnace system (part A), the problem of the discharge of organic waste gas and regeneration tail gas is solved, the hydrogen sulfide content of coke oven gas is controlled through the source, the standard emission of the flue gas of the tubular furnace is met, the low-temperature dew point corrosion of the tubular furnace is prevented, the whole process resource is reasonable in configuration, and the environment-friendly effect is good.
Example 1
The coking engineering of a certain coking plant is on the scale of 145 million tons of dry full coke, and a coal gas purification section consists of seven units of condensation blast (comprising five procedures of washing, primary cooling, electric catching, blast and tar and ammonia water separation), HPF desulfurization, phosphoric acid ammonia washing, final cooling benzene washing, coal gas fine desulfurization, ammonia distillation and negative pressure crude benzene distillation. Wherein, the negative pressure crude benzene distillation adopts a tubular furnace negative pressure debenzolization process, and the tubular furnace adopts a waste gas burner in the patent; the wet oxidation HPF desulfurization process adopted by the coal gas desulfurization process comprises the steps that the generated HPF regeneration tail gas contains 19.2 wt% of oxygen, and the generated HPF regeneration tail gas is treated by a water washing tower and then is sent into a negative pressure debenzolization tubular furnace to serve as combustion-supporting air; the coal gas after the fine desulfurization of the coal gas contains H 2 S:0.5mg/m 3 ,NH 3 :0.5mg/m 3 The main fuel of the negative pressure debenzolization tubular furnace is used, the organic waste gas generated in the negative pressure debenzolization area is used as an auxiliary fuel, and the use volume ratio of the refined gas to the organic waste gas is 8: 2, the usage amount of the refined gas is 1510Nm 3 Perh, a tubular furnace without the introduction of organic waste gases requires a gas quantity of approximately 1700Nm 3 The coal gas consumption is saved by 11.2 percent; through analysis and determination, the tube furnace combustion adopting the technologySO in tail gas 2 The content is 35mg/m 3 The NOx content is 50mg/m 3 And the requirement of emission standard of crude benzene tube furnace waste gas of new enterprises in the emission standard of pollutants for coking chemical industry (GB16171-2012) is met.
Example 2
The coking engineering of a certain coking plant is 350 ten thousand tons of dry full coke, and the coal gas purification section consists of six units, namely, a condensation blast (comprising five procedures of washing, primary cooling, electric catching, blast and tar and ammonia water separation), AS desulfurization, final cooling benzene washing, coal gas fine desulfurization, ammonia distillation and negative pressure crude benzene distillation. Wherein, the negative pressure crude benzene distillation adopts a tubular furnace negative pressure debenzolization process, and the tubular furnace adopts a waste gas burner in the patent; the AS desulfurization process adopted by the coal gas desulfurization process is a non-wet oxidation process, so that the negative pressure debenzolization tubular furnace completely adopts air AS combustion-supporting air; the coal gas after the fine desulfurization of the coal gas contains H 2 S:0.1mg/m 3 ,NH 3 :0.6mg/m 3 The main fuel of the negative pressure debenzolization tubular furnace is used, the organic waste gas generated in the negative pressure debenzolization area is used as an auxiliary fuel, and the use volume ratio of the refined gas to the organic waste gas is 17: 3, the usage amount of the refined gas is 2500Nm 3 The gas requirement of a tubular furnace without introducing organic waste gases is about 2750Nm 3 The coal gas consumption is saved by 9.1 percent; the analysis and the determination of SO in the combustion tail gas of the tubular furnace adopting the technology 2 The content is 30mg/m 3 The NOx content is 50mg/m 3 And the requirement of emission standard of crude benzene tube furnace waste gas of new enterprises in the emission standard of pollutants for coking chemical industry (GB16171-2012) is met.
Claims (6)
1. A comprehensive treatment method for standard-reaching emission of coking tail gas is characterized in that a negative-pressure debenzolization unit, a wet oxidation desulfurization regeneration tail gas treatment unit and a gas fine desulfurization unit in a coke oven gas purification area are combined with a tubular furnace system, purified gas treated by the gas fine desulfurization unit is used as a main fuel of the tubular furnace, organic waste gas of the negative-pressure debenzolization unit is used as an auxiliary fuel of the tubular furnace and enters a waste gas burner for combustion, tail gas treated by a water ammonia washing system of the wet oxidation desulfurization regeneration tail gas is used as combustion-supporting air of the tubular furnace, the gas quantity is insufficient and is supplemented by air, and the tail gas combusted by the tubular furnace meets the standard-reaching emission requirement and is directly emitted.
2. The comprehensive treatment method for standard-reaching coking tail gas emission according to claim 1, wherein the tube furnace burner is a professional waste gas burner and consists of a waste gas burner and a main burner.
3. The comprehensive treatment method for up-to-standard coking tail gas emission according to claim 1, wherein the negative pressure debenzolization unit adopts a wash oil circulating injection negative pressure pumping system, organic waste gas obtained after vacuum non-condensed steam of the negative pressure debenzolization tower and VOC tail gas in a crude benzene tank area are circularly washed by the wash oil enters a waste gas inlet of a waste gas burner of the tubular furnace.
4. The comprehensive treatment method for standard emission of coking tail gas according to claim 1, wherein the coal gas fine desulfurization unit is used for adsorbing clean coal gas subjected to desulfurization, deammoniation and benzene washing to obtain coal gas containing no more than 1mg/m of sulfur 3 Fine desulfurized gas.
5. The comprehensive treatment method for qualified emission of coking tail gas according to claim 1, wherein the tail gas of the wet oxidation desulfurization unit is used as combustion air of a waste gas burner.
6. The comprehensive treatment method for standard emission of coking tail gas according to claim 1, which is characterized in that when a wet oxidation desulfurization process is not adopted, air is completely adopted as combustion air of the tubular furnace.
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