CN110746993A - Tamping coke oven coal-charging smoke dust treatment and coke oven flue gas purification coupling system and process - Google Patents
Tamping coke oven coal-charging smoke dust treatment and coke oven flue gas purification coupling system and process Download PDFInfo
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- CN110746993A CN110746993A CN201911216213.7A CN201911216213A CN110746993A CN 110746993 A CN110746993 A CN 110746993A CN 201911216213 A CN201911216213 A CN 201911216213A CN 110746993 A CN110746993 A CN 110746993A
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- 239000000779 smoke Substances 0.000 title claims abstract description 181
- 239000000571 coke Substances 0.000 title claims abstract description 112
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 239000003546 flue gas Substances 0.000 title claims abstract description 102
- 239000000428 dust Substances 0.000 title claims abstract description 65
- 238000000746 purification Methods 0.000 title claims abstract description 34
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 230000008878 coupling Effects 0.000 title claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 92
- 239000007789 gas Substances 0.000 claims abstract description 70
- 238000003763 carbonization Methods 0.000 claims abstract description 41
- 238000002485 combustion reaction Methods 0.000 claims abstract description 40
- 230000001174 ascending effect Effects 0.000 claims abstract description 33
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 23
- 230000023556 desulfurization Effects 0.000 claims abstract description 23
- 239000002918 waste heat Substances 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 49
- 239000002817 coal dust Substances 0.000 claims description 17
- 238000004939 coking Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000011269 tar Substances 0.000 description 14
- 239000003034 coal gas Substances 0.000 description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 description 11
- 238000001816 cooling Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000011403 purification operation Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011273 tar residue Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B31/00—Charging devices
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B43/00—Preventing or removing incrustations
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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
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- 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
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention relates to a system and a process for coupling coal-charging smoke dust treatment and coke oven flue gas purification of a tamping coke oven, wherein a rising pipe is arranged at the top of a carbonization chamber of the tamping coke oven, the middle part of the rising pipe is connected with a gas collecting pipe through a bridge pipe, and a gas cut-off valve is arranged on the bridge pipe; a smoke guide tee joint A is arranged at the top of the ascending pipe and is connected with a smoke guide tee joint B through a first connecting pipeline, and a smoke stop valve is arranged on the first connecting pipeline; the smoke guide tee joints B of all the carbonization chambers are connected and form a furnace top coal charging smoke dust pipeline; the furnace top coal charging smoke dust pipeline is sequentially connected with a smoke combustion device, a fan, a coke oven smoke desulfurization and denitrification device, a coke oven smoke waste heat recovery device and a chimney. The invention can effectively avoid the problems of unfavorable smooth operation of a gas purification system and equipment, reduced quality of tar products and the like caused by the introduction of smoke dust generated in the coal charging process of the tamping coke oven into a gas system, improve the denitration efficiency of the coke oven flue gas and reduce the operation energy consumption.
Description
Technical Field
The invention relates to the technical field of coal coking, in particular to a system and a process for coupling coal charging smoke dust treatment and coke oven flue gas purification of a tamping coke oven.
Background
In the coking production, the heat accumulating type coke oven is most widely applied, and the coal charging mode can be generally divided into a top charging coke oven and a tamping coke oven. In either top-loading or stamp-charging coke ovens, the charging of the coal for coking is basically carried out in a hot charging mode, i.e., the coal for coking is charged into the coking chamber under a high-temperature state of the coking chamber. In the coal charging process, the coal material charged into the carbonization chamber is contacted with the hot inner wall of the carbonization chamber or can instantly generate a large amount of smoke under the high-temperature environment in the carbonization chamber, and the generated smoke can carry a certain amount of coal material particles. In order to prevent or reduce the pollution to the surrounding environment caused by the escape of a large amount of smoke dust from the carbonization chamber in the process of charging coal into the carbonization chamber, a smoke-free coal charging process such as Proven and OPR is generally adopted for the coal charging process, or a process of guiding the smoke dust generated in the coal charging process to the adjacent carbonization chamber by using high-pressure ammonia water injection, then entering a gas purification system, and collecting the smoke dust escaping from the furnace top and the smoke dust escaping from the furnace door at the machine side and then purifying by using a coal charging dust removal system is adopted for the coal charging process.
The smokeless coal charging process of Proven, OPR and the like is characterized in that micro negative pressure is formed in a carbonization chamber by improving the suction force of a coke oven gas collecting pipe, and a large amount of smoke generated during coal charging is led into the gas collecting pipe through an ascending pipe and a bridge pipe which are communicated with the coke oven gas collecting pipe, so that smokeless coal charging operation is realized. In the process, although the flue gas generated during coal charging is introduced into the gas system, the carried coal dust is also brought into the gas system, when the flue gas passes through the bridge pipe, most of the coal dust is washed by ammonia water used for gas cooling and enters tar along with tar ammonia water, tar slag is formed in the subsequent tar ammonia water separation process, and a part of the coal dust enters a subsequent primary cooler and an electric tar precipitator, so that the running resistance of the primary cooler can be increased, the cooling efficiency of the primary cooler is reduced, meanwhile, the quality of the tar can be reduced due to the fact that the coal dust enters the tar, and a certain amount of tar slag needing special treatment is generated.
The smoke dust produced in coal charging is guided to the adjacent carbonization chamber by high-pressure ammonia water injection and then enters a coal gas purification system, and is combined with the process of purifying the smoke dust escaped from the top of the furnace and the smoke dust escaped from the furnace door of the machine side, and then the process of purifying by a coal charging dust removal system is adopted The efficiency of trapping the coal-charging smoke dust is not satisfactory due to power media such as steam and electric energy. On the other hand, a high-pressure ammonia water injection facility needs to be arranged at the bridge pipe corresponding to the coal charging carbonization chamber or the bridge pipe corresponding to the adjacent carbonization chamber, most of smoke dust generated in the coal charging process is guided into the gas collecting pipe through the ascending pipe and the bridge pipe by utilizing the suction force formed by high-pressure ammonia water injection, so that a high-pressure ammonia water system needs to be arranged, and when the high-pressure ammonia water system consumes a certain amount of electric energy during operation, the coal dust brought into the gas system still brings the above-mentioned adverse effects to a subsequent gas purification system and reduces the quality of tar and other related problems.
From the whole coking process, if the flue gas generated during coal charging is completely recycled, about 2-4% of coal gas can be recycled. The existing coal-charging smoke dust treatment process has the problems that the effective recovery of coal gas resources is realized although part or all of flue gas generated during coal charging is guided into a coal gas system, the temperature of the flue gas is low, the moisture content in the flue gas is high, the effective coal gas components are not high, and meanwhile, the content of oxygen in the flue gas can be increased due to the suction force generated by the flue gas guide-in system, so that certain threat is brought to the safe operation of a subsequent coal gas purification system.
On the other hand, when coke oven flue gas is purified at present, generally because the temperature of the coke oven flue gas is low, a catalyst with high price and low denitration efficiency is often needed to be adopted when the coke oven flue gas is subjected to denitration, and when the ultralow emission index is required to be reached, the high-temperature waste gas generated by combustion of fuel gas by a heating furnace is often required to be mixed into the coke oven flue gas so as to improve the temperature of the coke oven flue gas, so that the requirements of using the catalyst with high denitration efficiency and low price are met, and the construction investment and the long-term operation energy consumption are obviously increased.
In summary, in order to effectively avoid the above problems caused by the treatment of coal-charging smoke dust during the coal charging process, and simultaneously solve the problem of low temperature of the coke oven smoke, improve the smoothness and tar quality of the gas purification system, and improve the purification efficiency of the coke oven smoke dust, it is necessary to develop a new coal-charging smoke dust treatment process by adopting new technical routes and technical means for the smoke dust generated during the coal charging process.
Disclosure of Invention
The invention provides a system and a process for coupling coal charging smoke dust treatment and coke oven smoke gas purification of a tamping coke oven, which can effectively avoid the problems of unfavorable smooth operation of a gas purification system and equipment, reduced quality of tar products and the like caused by the introduction of smoke dust generated in the coal charging process of the tamping coke oven into a gas system, improve the denitration efficiency of coke oven smoke gas and simultaneously reduce the operation energy consumption.
In order to achieve the purpose, the invention adopts the following technical scheme:
the system comprises a machine side furnace door sealing device, a gas stop valve, a smoke guide tee joint A, a smoke stop valve, a smoke guide tee joint B, a smoke combustion device, a fan, a coke oven smoke desulfurization and denitrification device, a coke oven smoke waste heat recovery device and a chimney; the top of a carbonization chamber of the tamping coke oven is provided with an ascending pipe, the middle part of the ascending pipe is connected with a gas collecting pipe through a bridge pipe, and the bridge pipe is provided with a gas cut-off valve; a smoke guide tee joint A is arranged at the top of the ascending pipe, one of 2 connectors oppositely arranged on the smoke guide tee joint A is communicated with the top opening of the ascending pipe, and a water seal valve is arranged at the other connector; the 3 rd interface of the smoke guide tee joint A is connected with one interface of the smoke guide tee joint B through a first connecting pipeline, and a smoke stop valve is arranged on the first connecting pipeline; 2 interfaces which are arranged oppositely to the smoke guide tee B are respectively connected with the corresponding interfaces of the smoke guide tee B which is arranged in the adjacent carbonization chamber through a connecting pipeline II to form a coal charging smoke dust pipeline on the top of the furnace; the furnace top coal charging smoke pipeline is sequentially connected with a smoke combustion device, a fan, a coke oven smoke desulfurization and denitrification device, a coke oven smoke waste heat recovery device and a chimney through a smoke conveying pipeline; the side furnace door sealing device is arranged on the coal charging car and can form a sealing structure with a side furnace door frame during coal charging.
The flue gas inlet of the coke oven flue gas desulfurization and denitrification device is connected with the main flue of the tamping coke oven through a coke oven flue gas pipeline, a combustion flue gas inlet is arranged on the coke oven flue gas pipeline close to the coke oven flue gas desulfurization and denitrification device, the inlet of the fan is connected with the high-temperature flue gas outlet of the flue gas combustion device, and the outlet of the fan is connected with the combustion flue gas inlet.
The side furnace door sealing device is a closed cover body formed by enclosing an upper sealing plate, a lower sealing plate, a side sealing plate, a front sealing plate and a rear supporting plate, wherein an opening for coal cakes to pass through is formed in the front sealing plate, the number of the rear supporting plates is 2, and the distance between the 2 rear supporting plates and one side of the center is larger than the width of a carbonization chamber.
And a communicating pipe is arranged between the starting end of the furnace top coal charging smoke dust pipeline and the gas collecting pipe along the flowing direction of the smoke gas, and a balance valve is arranged on the communicating pipe.
The flue gas combustion device has a volume not less than 3m3The flue gas combustion chamber is provided with an ignition device and a combustion-supporting gas inlet.
The coal charging smoke dust treatment and coke oven flue gas purification coupling process of the tamping coke oven comprises the following steps:
1) before the coal charging operation in the carbonization chamber is started, the ascending pipe and the gas collecting pipe of the corresponding carbonization chamber are separated by closing the gas stop valve on the bridge pipe, and meanwhile, the corresponding water seal valve is closed to isolate the ascending pipe from the atmosphere;
2) the sealing device of the machine side furnace door is tightly attached to the door frame of the machine side furnace through a driving device arranged on the coal charging car;
3) opening a smoke stop valve corresponding to the coking chamber to be charged with coal, and communicating the ascending pipe with the coal charging smoke dust pipeline at the top of the furnace;
4) a large amount of smoke generated when the coal cakes are fed into the carbonization chamber sequentially passes through the ascending pipe, the smoke guide tee joint A, the smoke stop valve, the smoke guide tee joint B and the coal-charging smoke pipeline at the top of the furnace to enter the smoke combustion device under the action of the fan; in the flue gas combustion device, coal dust and combustible components in flue gas are subjected to combustion reaction with combustion-supporting gas, high-temperature flue gas generated after combustion enters a coke oven flue gas pipeline at the upstream of the flue gas desulfurization and denitration device under the action of a fan and is mixed with coke oven flue gas, so that the temperature of the coke oven flue gas is raised, the flue gas enters the coke oven flue gas desulfurization and denitration device for desulfurization and denitration treatment, the purified flue gas enters the coke oven flue gas waste heat recovery device for waste heat recovery, and the purified flue gas after waste heat recovery is discharged through a chimney;
5) after the coal charging is finished, the sealing device of the machine side furnace door is separated from the machine side furnace door frame, the machine side furnace door is closed, and then the corresponding gas cut-off valve is opened to ensure that the ascending pipe of the carbonization chamber is communicated with the gas collecting pipe again; and closing the previously opened smoke stop valve to cut off the passage between the ascending pipe and the coal-charging smoke dust pipeline on the top of the furnace.
Compared with the prior art, the invention has the beneficial effects that:
1) the smooth capability of the gas purification system is improved, and the quality of the gas and the tar is improved;
the flue gas with a large amount of coal dust generated in the coal charging process of the coke oven is separately collected and treated, so that the flue gas with a large amount of coal dust is prevented from entering a gas purification system, factors of resistance increase and cooling capacity reduction of a gas primary cooling device caused by the coal dust carried in the flue gas are eliminated, the smooth capacity of the gas purification system is improved, the quality of the gas and the quality of the collected tar are improved, and the generation of tar residues is reduced.
2) The coal charging smoke dust treatment investment and the operation cost are reduced;
the flue gas with a large amount of coal dust generated during the coal charging of the coke oven is separately collected and treated, so that a smokeless coal charging system such as high-pressure ammonia water, Proven and OPR, a coal charging smoke guide vehicle, a furnace top smoke guide hole and other facilities are omitted, a coal charging dust removal system in the prior art is not required to be built, and the investment of project construction and the energy consumption of the system in long-term operation can be obviously reduced.
3) The gas resources are fully utilized, the coke oven flue gas purification efficiency is improved, and the coke oven flue gas purification operation cost is reduced;
the flue gas with a large amount of coal dust generated during the coal charging of the coke oven is independently collected and combusted and then is doped into the flue gas of the coke oven, so that on one hand, the temperature of the flue gas of the coke oven is improved, the purification efficiency of the flue gas of the coke oven can be improved, the purification operation cost of the flue gas of the coke oven is reduced, on the other hand, the waste heat of the purified flue gas of the coke oven is recovered by using the flue gas waste heat recovery device of the coke oven, the effective utilization of low-quality coal gas resources is realized, the consumption of high-quality coke oven gas is reduced.
4) The running safety of the gas purification system is improved;
compared with the prior art that the suction force generated by spraying high-pressure ammonia water or the suction force in the gas collecting pipe is improved to guide the smoke generated during coal charging into the gas purification system, the smoke with a large amount of coal dust generated during coal charging of the coke oven is independently collected and treated by the fan, the problem that the safety of the gas purification system is seriously threatened due to the fact that the oxygen content in the gas purification system exceeds the standard caused by the overlarge suction force of the smoke collection system is not considered, the generated smoke is effectively collected in the coal charging process, and meanwhile, the operation safety of the gas purification system is improved.
Drawings
FIG. 1 is a schematic structural diagram of a tamping coke oven coal-charging smoke dust treatment and coke oven flue gas purification coupling system.
FIG. 2 is a schematic view showing the connection relationship between the ascending pipe and the gas collecting pipe and the coal-charging flue gas pipe on the top of the furnace.
Fig. 3 is a schematic view of the working state of the machine side oven door sealing device of the invention.
Fig. 4 is a schematic structural view of the machine side oven door sealing device of the invention.
In the figure: 1. tamping coke oven 2, machine side oven door sealing device 21, upper sealing plate 22, lower sealing plate 23, side sealing plate 24, front sealing plate 25, rear supporting plate 3, ascending pipe 4, gas stop valve 5, smoke guide tee joint A6, smoke stop valve 7, smoke guide tee joint B8. smoke combustion device 9, fan 10, coke oven smoke desulfurization and denitrification device 11, coke oven smoke waste heat recovery device 12, balance valve 13, smoke conveying pipeline 14, chimney 15, gas collecting pipe 16, water sealing valve 17, machine side oven door frame 18, machine side oven column 19, coal cake
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1 and 2, the tamping coke oven coal-charging smoke dust treatment and coke oven flue gas purification coupling system comprises an oven side door sealing device 2, a gas cut-off valve 4, a smoke guide tee joint A5, a flue gas cut-off valve 6, a smoke guide tee joint B7, a flue gas combustion device 8, a fan 9, a coke oven flue gas desulfurization and denitrification device 10, a coke oven flue gas waste heat recovery device 11 and a chimney 14; the top of a carbonization chamber of the tamping coke oven 1 is provided with a riser 3, the middle part of the riser 3 is connected with a gas collecting pipe 15 through a bridge pipe, and the bridge pipe is provided with a gas cut-off valve 4; a smoke guide tee joint A5 is arranged at the top of the ascending pipe 3, one of 2 interfaces oppositely arranged on the smoke guide tee joint A5 is communicated with the top opening of the ascending pipe 3, and a water seal valve 16 is arranged at the other interface; the 3 rd interface of the smoke guide tee joint A5 is connected with one interface of the smoke guide tee joint B7 through a first connecting pipeline, and a smoke stop valve 6 is arranged on the first connecting pipeline; 2 interfaces which are arranged oppositely to the smoke guide tee joint B7 are respectively connected with the corresponding interfaces of the smoke guide tee joint B7 arranged in the adjacent carbonization chamber through a second connecting pipeline to form a coal charging smoke dust pipeline on the top of the furnace; the furnace top coal charging smoke pipeline is sequentially connected with a smoke combustion device 8, a fan 9, a coke oven smoke desulfurization and denitration device 10, a coke oven smoke waste heat recovery device 11 and a chimney 14 through a smoke conveying pipeline 13; the side furnace door sealing device 2 is arranged on a coal charging car and can form a sealing structure with a side furnace door frame 17 (shown in figure 3) when coal is charged.
The side furnace door sealing device 2 is arranged on the coal charging car, covers the side furnace door frame 17 when the coal cake 19 is fed into the carbonization chamber through a driving device arranged on the coal charging car, and forms a closed space outside the side furnace opening of the carbonization chamber, the space only allows the coal cake 19 to pass through, and the coal charging smoke dust can be effectively prevented from escaping from the side furnace opening during coal charging.
Unlike the existing machine side oven door sealing device, the machine side oven door sealing device 2 of the invention is directly covered on the machine side oven door frame 17, but not on the machine side oven column 18. The side furnace door sealing device commonly used at present is covered on the side furnace column 18, a space which is opened up and down is formed between the side furnace opening and the side furnace door sealing cover, the space which is opened up is communicated with the side furnace door smoke dust collecting cover which is arranged between the furnace columns above the furnace door, under the action of a dedusting ground station fan, a large amount of ambient air can be sucked from the space which is opened up, and the ambient air can be merged with smoke dust which escapes from the side furnace opening in the rising process and then enters the dedusting ground station through the side furnace door smoke dust collecting cover. The invention adopts the machine side furnace door sealing device 2 directly covered on the machine side furnace door frame 17, the upper part, the lower part, the left part and the right part of the machine side furnace door sealing device are both closed, only one opening for the coal cake 19 to pass through is arranged, the smoke dust generated in the carbonization chamber can be effectively closed in the carbonization chamber, and sufficient negative pressure is generated at the gap between the machine side furnace door sealing device 2 and the coal cake 19 under the action of the fan 9, thereby effectively preventing the smoke dust from escaping, reducing the doping of ambient air and improving the safety of a coal-charging smoke dust collecting system.
The smoke and dust conveying channel 13 is obliquely arranged at a certain angle with the horizontal plane, so that coal dust in the coal-charging smoke and dust is prevented from being deposited in the pipeline and being blocked.
By arranging the balance valve 12, the surge problem which may occur to the fan 9 during operation can be eliminated, and the safe and stable operation of the fan 9 can be ensured.
The flue gas inlet of the coke oven flue gas desulfurization and denitrification device 10 is connected with the main flue of the tamping coke oven 1 through a coke oven flue gas pipeline, a combustion flue gas inlet is arranged on the coke oven flue gas pipeline close to the coke oven flue gas desulfurization and denitrification device 10, the inlet of the fan 9 is connected with the high-temperature flue gas outlet of the flue gas combustion device 8, and the outlet of the fan 9 is connected with the combustion flue gas inlet.
As shown in fig. 4, the side oven door sealing device 2 is a closed cover body enclosed by an upper sealing plate 21, a lower sealing plate 22, a side sealing plate 23, a front sealing plate 24 and a rear support plate 25, the front sealing plate 24 is provided with an opening for the coal cake 19 to pass through, the rear support plate 25 is 2, and the distance between the 2 rear support plates 25 towards the center side is larger than the width of the carbonization chamber.
Along the flowing direction of the flue gas, a communicating pipe is arranged between the starting end of the furnace top coal-charging smoke dust pipeline and the gas collecting pipe 15, and a balance valve 12 is arranged on the communicating pipe.
The volume of the flue gas combustion device 8 is not less than 3m3The flue gas combustion chamber is provided with an ignition device and a combustion-supporting gas inlet. The coal-charging smoke dust enters the smoke combustion chamber under the action of the fan 9, the mixture of the coal-charging smoke dust and the introduced combustion-supporting gas is ignited through the ignition device, a large amount of high-temperature smoke gas is generated when coal gas components and coal dust in the coal-charging smoke dust are combusted, the residual dust generated by combustion of the coal dust is settled to the bottom in the smoke combustion chamber, and the high-temperature smoke gas is converged with the coke oven smoke gas generated by combustion of a coke oven heating system through the smoke conveying pipeline 13.
The coal charging smoke dust treatment and coke oven flue gas purification coupling process of the tamping coke oven comprises the following steps:
1) before the coal charging operation in the carbonization chamber is started, the ascending pipe 3 of the corresponding carbonization chamber is separated from the gas collecting pipe 15 by closing the gas stop valve 4 on the bridge pipe, and meanwhile, the corresponding water seal valve 16 is closed, so that the ascending pipe 3 is isolated from the atmosphere; coal-charging smoke dust generated during coal charging is prevented from entering the coal gas purification system by mistake;
2) the sealing device 2 of the machine side furnace door is tightly attached to the door frame 17 of the machine side furnace by a driving device arranged on the coal charging car; coal-charging smoke dust generated in the coking chamber is guaranteed to escape to the periphery of the coke oven through the side oven port of the coking chamber during coal charging so as to cause environmental pollution;
3) opening a smoke stop valve 6 corresponding to the carbonization chamber to be charged with coal, so that the ascending pipe 3 is communicated with a coal charging smoke dust pipeline at the top of the furnace; at the moment, under the action of the fan 9, a certain negative pressure is formed in the carbonization chamber, which is beneficial to effectively catching coal-charging smoke dust generated during coal charging;
4) a large amount of smoke generated when the coal cake 19 is fed into the carbonization chamber enters a smoke combustion device 8 through an ascending pipe 3, a smoke guide tee A5, a smoke stop valve 6, a smoke guide tee B7 and a furnace top coal-charging smoke pipeline in sequence under the action of a fan 9; in the flue gas combustion device 8, coal dust and combustible components in flue gas and combustion-supporting gas are subjected to combustion reaction, high-temperature flue gas generated after combustion enters a coke oven flue gas pipeline at the upstream of the flue gas desulfurization and denitration device 10 under the action of the fan 9 and is mixed with coke oven flue gas, so that the temperature of the coke oven flue gas is raised, the flue gas enters the coke oven flue gas desulfurization and denitration device 10 along with the flue gas to be subjected to desulfurization and denitration treatment, the purified flue gas enters the coke oven flue gas waste heat recovery device 11 to recover waste heat, and the purified flue gas after waste heat recovery is discharged 14 through a chimney; because the temperature of the mixed coke oven flue gas is improved to a certain extent, the method is beneficial to adopting a denitration catalyst with higher catalytic efficiency and more stable and reliable operation, and reduces the operation cost of a denitration system while improving the denitration effect.
5) After the coal charging is finished, the sealing device 2 of the machine side furnace door is separated from the machine side furnace door frame 17, the machine side furnace door is closed, and then the corresponding coal gas cut-off valve 4 is opened to ensure that the ascending pipe 3 of the carbonization chamber is communicated with the gas collecting pipe 15 again; and closing the previously opened smoke stop valve 6 to cut off the passage between the ascending pipe 3 and the coal-charging smoke dust pipeline on the top of the furnace. At the moment, the coal cake 19 in the carbonization chamber enters a carbonization process in an oxygen-free environment, and the coal gas generated by carbonization only carries little dust in a stable state of the coal material, so that the adverse effect of the coal gas introduced into the coal gas purification system on subsequent purification treatment facilities caused by the dust is basically eliminated during non-coal charging, and the quality of tar is also certainly and greatly improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The system is characterized by comprising a machine side furnace door sealing device, a gas stop valve, a smoke guide tee joint A, a smoke stop valve, a smoke guide tee joint B, a smoke combustion device, a fan, a coke oven smoke desulfurization and denitrification device, a coke oven smoke waste heat recovery device and a chimney; the top of a carbonization chamber of the tamping coke oven is provided with an ascending pipe, the middle part of the ascending pipe is connected with a gas collecting pipe through a bridge pipe, and the bridge pipe is provided with a gas cut-off valve; a smoke guide tee joint A is arranged at the top of the ascending pipe, one of 2 connectors oppositely arranged on the smoke guide tee joint A is communicated with the top opening of the ascending pipe, and a water seal valve is arranged at the other connector; the 3 rd interface of the smoke guide tee joint A is connected with one interface of the smoke guide tee joint B through a first connecting pipeline, and a smoke stop valve is arranged on the first connecting pipeline; 2 interfaces which are arranged oppositely to the smoke guide tee B are respectively connected with the corresponding interfaces of the smoke guide tee B which is arranged in the adjacent carbonization chamber through a connecting pipeline II to form a coal charging smoke dust pipeline on the top of the furnace; the furnace top coal charging smoke pipeline is sequentially connected with a smoke combustion device, a fan, a coke oven smoke desulfurization and denitrification device, a coke oven smoke waste heat recovery device and a chimney through a smoke conveying pipeline; the side furnace door sealing device is arranged on the coal charging car and can form a sealing structure with a side furnace door frame during coal charging.
2. The stamp-charging coke oven coal-charging smoke dust treatment and coke oven smoke purification coupling system according to claim 1, wherein a smoke inlet of the coke oven smoke desulfurization and denitrification device is connected with a total flue of the stamp-charging coke oven through a coke oven smoke pipeline, a coke oven smoke pipeline close to the coke oven smoke desulfurization and denitrification device is provided with a combustion smoke inlet, an inlet of a fan is connected with a high-temperature smoke outlet of the smoke combustion device, and an outlet of the fan is connected with the combustion smoke inlet.
3. The system of claim 1, wherein the sealing device of the oven door on the tamping coke oven is a closed cover body surrounded by an upper sealing plate, a lower sealing plate, side sealing plates, a front sealing plate and a rear support plate, the front sealing plate is provided with an opening for coal cake to pass through, the number of the rear support plates is 2, and the distance between the two rear support plates towards the center is larger than the width of the coking chamber.
4. The stamp-charging coke oven coal-charging smoke dust treatment and coke oven smoke purification coupling system according to claim 1, wherein a communicating pipe is arranged between the starting end of the furnace top coal-charging smoke dust pipeline and the gas collecting pipe along the smoke flowing direction, and a balance valve is arranged on the communicating pipe.
5. The stamp-charging coke oven coal-charging smoke dust treatment and coke oven smoke purification coupling system as claimed in claim 1, wherein the smoke combustion device is not less than 3m in volume3The flue gas combustion chamber is provided with an ignition device and a combustion-supporting gas inlet.
6. The stamp-charging coke oven coal-charging smoke dust treatment and coke oven smoke purification coupling process based on the system of claim 1 is characterized by comprising the following steps:
1) before the coal charging operation in the carbonization chamber is started, the ascending pipe and the gas collecting pipe of the corresponding carbonization chamber are separated by closing the gas stop valve on the bridge pipe, and meanwhile, the corresponding water seal valve is closed to isolate the ascending pipe from the atmosphere;
2) the sealing device of the machine side furnace door is tightly attached to the door frame of the machine side furnace through a driving device arranged on the coal charging car;
3) opening a smoke stop valve corresponding to the coking chamber to be charged with coal, and communicating the ascending pipe with the coal charging smoke dust pipeline at the top of the furnace;
4) a large amount of smoke generated when the coal cakes are fed into the carbonization chamber sequentially passes through the ascending pipe, the smoke guide tee joint A, the smoke stop valve, the smoke guide tee joint B and the coal-charging smoke pipeline at the top of the furnace to enter the smoke combustion device under the action of the fan; in the flue gas combustion device, coal dust and combustible components in flue gas are subjected to combustion reaction with combustion-supporting gas, high-temperature flue gas generated after combustion enters a coke oven flue gas pipeline at the upstream of the flue gas desulfurization and denitration device under the action of a fan and is mixed with coke oven flue gas, so that the temperature of the coke oven flue gas is raised, the flue gas enters the coke oven flue gas desulfurization and denitration device for desulfurization and denitration treatment, the purified flue gas enters the coke oven flue gas waste heat recovery device for waste heat recovery, and the purified flue gas after waste heat recovery is discharged through a chimney;
5) after the coal charging is finished, the sealing device of the machine side furnace door is separated from the machine side furnace door frame, the machine side furnace door is closed, and then the corresponding gas cut-off valve is opened to ensure that the ascending pipe of the carbonization chamber is communicated with the gas collecting pipe again; and closing the previously opened smoke stop valve to cut off the passage between the ascending pipe and the coal-charging smoke dust pipeline on the top of the furnace.
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| CN113862006A (en) * | 2020-06-30 | 2021-12-31 | 宝山钢铁股份有限公司 | Method for controlling smoke generation during opening of coke oven ascending pipe |
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