CN107014218B - Thermal power generation system based on waste heat and complementary energy integrated utilization of coking plant - Google Patents
Thermal power generation system based on waste heat and complementary energy integrated utilization of coking plant Download PDFInfo
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- CN107014218B CN107014218B CN201710353985.XA CN201710353985A CN107014218B CN 107014218 B CN107014218 B CN 107014218B CN 201710353985 A CN201710353985 A CN 201710353985A CN 107014218 B CN107014218 B CN 107014218B
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- 239000002918 waste heat Substances 0.000 title claims abstract description 146
- 238000010248 power generation Methods 0.000 title claims abstract description 57
- 238000004939 coking Methods 0.000 title abstract description 10
- 230000000295 complement effect Effects 0.000 title description 2
- 239000007789 gas Substances 0.000 claims abstract description 244
- 239000000571 coke Substances 0.000 claims abstract description 126
- 238000010791 quenching Methods 0.000 claims abstract description 119
- 230000000171 quenching effect Effects 0.000 claims abstract description 119
- 238000011084 recovery Methods 0.000 claims abstract description 52
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 239000002699 waste material Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 92
- 239000000428 dust Substances 0.000 claims description 21
- 230000001174 ascending effect Effects 0.000 claims description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 16
- 239000003546 flue gas Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000001172 regenerating effect Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000013021 overheating Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000003303 reheating Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- 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
Abstract
The invention provides a thermal power generation system based on integrated utilization of waste heat and waste energy of a coking plant, which comprises a coke oven, a dry quenching furnace, a dry quenching waste heat boiler, a raw coke oven gas waste heat recovery device, a raw coke oven gas purifying device, a coke oven gas boiler, a steam turbine and a generator, wherein coke oven hot coke is sent into the dry quenching furnace for cooling, and the sensible heat of circulating gas at an outlet of the dry quenching furnace is recovered by the dry quenching waste heat boiler; the raw gas waste heat recovery device is used for recovering sensible heat of raw gas; the raw gas purifying treatment device purifies raw gas and sends the purified raw gas into a coke oven gas boiler; the steam generated by the coke oven gas boiler is subjected to work by a high-pressure cylinder of a steam turbine and then enters a dry quenching waste heat boiler for reheating, and enters a medium-pressure cylinder of the steam turbine together with the superheated steam at the high-pressure section of the dry quenching waste heat boiler, and the exhaust steam of the medium-pressure cylinder of the steam turbine and the superheated steam at the low-pressure section of the dry quenching waste heat boiler enter the low-pressure cylinder of the steam turbine together; the turbine drives the generator to generate electricity. The system can efficiently and integrally utilize the sensible heat of coke oven gas, coke and raw gas.
Description
Technical Field
The invention relates to the technical field of heat energy utilization in coking industry, in particular to a thermal power generation system based on integrated utilization of waste heat and residual energy of a coking plant.
Background
In the coke oven production process, various residual energy and waste heat resources exist, including coke oven gas chemical energy, coke sensible heat, raw gas sensible heat and other high-temperature waste heat. In the background of increasingly prominent energy problems, efficient utilization of these waste heat and residual energy resources is currently a major concern for various coking plants or steel plants.
For coke oven gas, the main utilization way is to heat fuel as a coke oven and generate electricity through a gas boiler, and some coking plants use the coke oven gas as chemical raw materials to produce chemical products such as methanol, synthetic ammonia and the like.
For sensible heat of coke, a dry quenching technology is mainly adopted to recover sensible heat of high-temperature red coke, and steam is generated to drive a steam turbine to generate electricity.
For high-temperature raw gas, the currently commonly adopted main stream treatment method is to collect the raw gas generated in the dry distillation process of a carbonization chamber into the top space of the carbonization chamber, and enter a gas collecting pipe through a rising pipe and a bridge pipe, wherein the raw gas at 650-800 ℃ is sprayed and cooled to about 85 ℃ by ammonia water in the bridge pipe, so that a large amount of heat energy is wasted, and as the raw gas contains various components such as tar, when the temperature is lower than a certain temperature, the tar is separated out, thereby blocking the rising pipe and affecting the production of a coke oven.
The prior technical proposal is implemented by dividing coke oven gas, coke sensible heat and raw coke gas sensible heat into independent systems, and does not consider the coupling integration of various waste heat resources. The independent thermodynamic systems not only cause the complexity and even redundancy of the systems, but also have the problems of large occupied area of the factory buildings, large engineering cost, large total investment, high operation cost and the like.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and aims to provide a thermal power generation system based on the integrated utilization of waste heat and residual energy of a coking plant, which can couple and integrate resources such as coke oven gas, coke sensible heat, raw gas sensible heat and the like in a coke oven area and efficiently utilize the resources.
In order to achieve the above purpose, the invention provides a thermal power generation system based on the integrated utilization of waste heat and waste energy of a coke oven plant, which comprises a coke oven, a dry quenching furnace, a dry quenching waste heat boiler, a raw gas waste heat recovery device, a raw gas purifying treatment device, a coke oven gas boiler, a steam turbine and a generator, wherein a coke discharging port of the coke oven is connected with a coke loading port of the dry quenching furnace, and hot coke generated by the coke oven is cooled in the dry quenching furnace through circulating gas; the circulating gas outlet of the dry quenching furnace is communicated with the flue gas inlet of the dry quenching waste heat boiler, the flue gas outlet of the dry quenching waste heat boiler is communicated with the circulating gas inlet of the dry quenching furnace, so that a circulating loop is formed, and the sensible heat of the circulating gas is recycled by the dry quenching waste heat boiler; the raw gas outlet of the coke oven is communicated with the gas inlet of the raw gas waste heat recovery device, an evaporation heating surface is arranged in the raw gas waste heat recovery device, and sensible heat of high-temperature raw gas in the coke oven is recovered; the gas outlet of the raw gas waste heat recovery device is communicated with the gas inlet of the raw gas purifying treatment device, and the raw gas purifying treatment device purifies and cools the raw gas from the raw gas waste heat recovery device; the gas outlet of the raw gas purifying treatment device is communicated with the gas inlet of the coke oven gas boiler, and purified gas is sent into the coke oven gas boiler; the raw gas waste heat recovery device is communicated with the dry quenching waste heat boiler through a boiler barrel, and a steam-water mixture generated by the raw gas waste heat recovery device is sent into the dry quenching waste heat boiler for overheating after being subjected to steam-water separation in the boiler barrel; the steam inlet of the steam turbine is respectively communicated with the superheated steam outlet of the coke oven gas boiler and the superheated steam outlet of the dry quenching waste heat boiler; the steam turbine is connected with the generator to drive the generator to generate electricity.
The thermal power generation system comprises a low-pressure section drum and a high-pressure section drum; the dry quenching waste heat boiler is internally provided with a multi-stage superheater, and comprises a second high-pressure section superheater, a first high-pressure section superheater and a low-pressure section superheater, wherein a steam outlet of the low-pressure section boiler barrel is communicated with a steam inlet of the low-pressure section superheater, a steam outlet of the high-pressure section boiler barrel is communicated with a steam inlet of the first high-pressure section superheater, and a steam outlet of the first high-pressure section superheater is communicated with a steam inlet of the second high-pressure section superheater; the steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; the superheated steam outlet of the coke oven gas boiler is communicated with the steam inlet of the high-pressure cylinder of the steam turbine, the steam outlet of the high-pressure cylinder of the steam turbine is communicated with the steam inlet of the second high-pressure section superheater of the dry quenching waste heat boiler, the superheated steam outlet of the second high-pressure section superheater is communicated with the steam inlet of the medium-pressure cylinder of the steam turbine, the steam outlet of the medium-pressure cylinder of the steam turbine is communicated with the steam inlet of the low-pressure cylinder of the steam turbine, and the steam outlet of the low-pressure section superheater of the dry quenching waste heat boiler is also communicated with the steam inlet of the low-pressure cylinder of the steam turbine.
The thermal power generation system further comprises a high-pressure section evaporator, a high-pressure section economizer, a low-pressure section evaporator and a low-pressure section economizer, and the second high-pressure section superheater, the first high-pressure section superheater, the high-pressure section evaporator, the high-pressure section economizer, the low-pressure section superheater, the low-pressure section evaporator and the low-pressure section economizer are sequentially arranged inside the waste heat boiler along a flue gas flow.
The thermal power generation system further comprises a condenser, a condensate pump, a deoxidizing head and a first water supply pump, wherein the deoxidizing head is arranged above the low-pressure section boiler barrel which also serves as a deoxidizing water tank; the steam outlet of the low-pressure cylinder of the steam turbine is sequentially communicated with the water inlets of the condenser, the condensate pump, the low-pressure section economizer and the deoxidizing head along a steam-water flow; the first descending pipe orifice of the low-pressure section boiler barrel is communicated with the water inlet of the low-pressure section evaporator through a descending pipe, and the steam outlet of the low-pressure section evaporator is communicated with the first ascending pipe orifice of the low-pressure section boiler barrel through an ascending pipe to form a low-pressure steam-water natural circulation loop; the first water outlet of the low-pressure section boiler barrel is sequentially communicated with the high-pressure section economizer and the water inlet of the high-pressure section boiler barrel through a first water supply pump; the high-pressure section boiler barrel is communicated with the water inlet of the high-pressure section evaporator through a down pipe, and the steam outlet of the high-pressure section evaporator is communicated with the ascending pipe orifice of the high-pressure section boiler barrel through an ascending pipe to form a high-pressure steam-water natural circulation loop.
The thermal power generation system is characterized in that an auxiliary heating steam interface is arranged on the deoxidizing head and is communicated with an external auxiliary steam source to be used as starting steam of the whole set of thermal power generation system or a standby steam source when a dry quenching waste heat boiler has a problem.
The thermal power generation system further comprises a circulating pump, a second descending pipe orifice of the low-pressure section boiler barrel is sequentially communicated with the circulating pump and a water inlet of the raw gas waste heat recovery device, and a steam outlet of the raw gas waste heat recovery device is communicated with a second ascending pipe orifice of the low-pressure section boiler barrel to form a low-pressure steam-water forced circulation loop.
The thermal power generation system further comprises a second water feeding pump and a high-pressure water feeding heater, wherein a second water outlet of the low-pressure section drum is communicated with a water inlet of the high-pressure water feeding heater through the second water feeding pump, and a water outlet of the high-pressure water feeding heater is communicated with a water feeding inlet of the coke oven gas boiler.
And the thermal power generation system is characterized in that a regenerative steam extraction port is arranged on the middle pressure cylinder of the steam turbine, and the regenerative steam extraction port is communicated with a heating steam inlet of the high-pressure feed water heater.
The thermal power generation system further comprises a primary dust remover, a secondary dust remover and a circulating fan, wherein the primary dust remover is communicated with a circulating gas outlet of the dry quenching furnace and a flue gas inlet of the dry quenching waste heat boiler, one end of the secondary dust remover is communicated with a flue gas outlet of the dry quenching waste heat boiler, the other end of the secondary dust remover is communicated with an air inlet of the circulating fan, and an air outlet of the circulating fan is communicated with a circulating gas inlet of the dry quenching furnace.
The thermal power generation system further comprises a gas tank, wherein the gas tank is arranged on a gas pipeline between the raw gas purifying device and the gas boiler, a gas outlet of the raw gas purifying device is communicated with a gas inlet of the gas tank, and a gas outlet of the gas tank is communicated with a gas inlet of the coke oven gas boiler.
The invention has the beneficial effects that:
1) The thermal power generation system based on high-efficiency integration of coke oven gas and dry quenching waste heat utilization is constructed, a mode of coexistence of conventional coke oven gas power generation, dry quenching waste heat power generation and coke oven raw gas waste heat recovery systems is optimized, at least one set of steam turbine generator unit and matched auxiliary facilities are omitted, and the engineering occupied area and the construction total cost are greatly reduced;
2) The steam system and the water supply system of the coke oven gas generator set, the dry quenching waste heat utilization unit and the pipe raw gas waste heat recovery system are highly coupled and integrated, so that the unit heat recovery system is greatly simplified under the condition that the whole thermal economy of the unit is not affected, and the low-pressure heat recovery system independently configured by a set of conventional coke oven gas generator set is omitted, so that the whole thermal system is more concise, and the engineering occupied area and the construction total cost are greatly reduced;
3) The high-temperature section superheater of the dry quenching waste heat boiler is divided into a second high-pressure section superheater and a first high-pressure section superheater, the second high-pressure section superheater is used as a reheater for exhausting steam of a high-pressure cylinder of the steam turbine, compared with a conventional independently arranged coke oven gas boiler and a thermodynamic system of the dry quenching waste heat boiler, the reheating of steam is realized without adding any heat exchange surface, the overall heat efficiency of the system is improved, the dryness of final blades of the steam turbine is improved, the working condition of the final blades of the low-pressure cylinder of the steam turbine is improved, and the operation safety and stability of the steam turbine are improved;
4) The thermodynamic system is based on the optimal design under the second law of thermodynamics, the whole set of heat exchange system is matched with the grade of a heat exchange medium (steam-water) according to the quality of a smoke heat source, the high-temperature heat source is used for heating high-grade steam-water, the low-temperature heat source is used for heating low-grade steam-water, the utilization of heat energy is guaranteed in terms of quantity, and the comprehensive heat exchange effect of the whole set of system is guaranteed in terms of quality.
Drawings
Other objects and results of the present invention will become more apparent and readily appreciated by reference to the following detailed description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a block diagram of a thermal power generation system based on the integrated utilization of waste heat and energy of a coking plant;
FIG. 2 is a schematic diagram of a preferred embodiment of the thermal power generation system of the present invention based on the integrated utilization of the waste heat and energy of a coke oven plant.
In the drawings, like reference numerals designate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Various embodiments according to the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a thermal power generation system based on integrated utilization of waste heat and waste energy of a coke oven plant, and as shown in fig. 1, the thermal power generation system comprises a coke oven 1, a dry quenching furnace 2, a dry quenching waste heat boiler 4, a raw gas waste heat recovery device 7, a raw gas purifying treatment device 8, a coke oven gas boiler 10, a steam turbine 11 and a generator 12, wherein:
the coke discharging port of the coke oven 1 is connected with the coke loading port of the dry quenching oven 2, and hot coke generated by the coke oven 1 is cooled in the dry quenching oven 2 through circulating gas;
the circulating gas outlet of the dry quenching furnace 2 is communicated with the flue gas inlet of the dry quenching waste heat boiler 4, the flue gas outlet of the dry quenching waste heat boiler 4 is communicated with the circulating gas inlet of the dry quenching furnace 2, so that a circulating loop is formed, and the sensible heat of the circulating gas is recycled by the dry quenching waste heat boiler 4;
the raw gas outlet of the coke oven 1 is communicated with the gas inlet of the raw gas waste heat recovery device 7, an evaporation heating surface is arranged in the raw gas waste heat recovery device 7, and sensible heat of high-temperature raw gas in the coke oven is recovered;
the gas outlet of the raw gas waste heat recovery device 7 is communicated with the gas inlet of the raw gas purifying device 8, and the raw gas purifying device 8 purifies and cools the raw gas from the raw gas waste heat recovery device;
the gas outlet of the raw gas purifying treatment device 8 is communicated with the gas inlet of the coke oven gas boiler 10, and purified gas is sent into the coke oven gas boiler 10;
the raw gas waste heat recovery device 7 is communicated with the dry quenching waste heat boiler 4 through a boiler barrel, and a steam-water mixture generated by the raw gas waste heat recovery device 7 is sent into the dry quenching waste heat boiler 4 for overheating after being subjected to steam-water separation in the boiler barrel;
the steam inlet of the steam turbine 11 is respectively communicated with a superheated steam outlet of the coke oven gas boiler 10 and a superheated steam outlet of the dry quenching waste heat boiler 4;
the steam turbine 11 is connected to the generator 12, and drives the generator 12 to generate electricity.
The process flow of the thermal power generation system is as follows:
the hot coke of the coke oven 1 is cooled by the circulating gas of the dry quenching oven 2, the high-temperature circulating gas coming out of the dry quenching oven 2 enters the dry quenching waste heat boiler 4 for heat exchange, and the low-temperature circulating gas discharged after the dry quenching waste heat boiler 4 absorbs heat and cools is returned to the dry quenching oven 2 and is continuously used for cooling the hot coke in the dry quenching oven 2, so that the circulating process of the cooling gas of the dry quenching oven 2 is formed;
raw gas generated by the coke oven 1 is recycled through the raw gas waste heat recycling device 7 and then is evolved through the raw gas purifying device 8 to be sent into the coke oven gas boiler 10 for combustion, and the raw gas is used as main fuel of the coke oven gas boiler 10;
the superheated steam generated by the coke oven gas boiler 10 is used as main steam to enter the steam turbine 11, the superheated steam generated by the dry quenching waste heat boiler 4 is used as first-stage supplementing steam to enter the steam turbine 11, the steam generated by the raw gas waste heat recovery device 7 is sent into the dry quenching waste heat boiler 4 for overheating after being subjected to steam-water separation through a boiler barrel, and then is sent into the steam turbine 11 as second-stage supplementing steam, so that the power generation of the steam turbine 11 is improved, the efficient utilization of steam resources is realized, and the steam turbine 11 drives the generator 12 to rotate for power generation.
The thermal power generation system can be used for coupling and integrating resources including coke oven gas, coke sensible heat, raw gas sensible heat and the like, optimizes the thermal power generation system, inevitably generates considerable economic benefits, and has important practical significance.
In an alternative embodiment, in the thermal power generation system based on the integrated utilization of the waste heat and the residual energy of the coking plant, the thermal power generation system comprises a power generation system body, a power generation system body and a power generation system body, wherein the power generation system body is connected with the power generation system body through the power:
the drums include a low pressure section drum 16 and a high pressure section drum 18;
the dry quenching waste heat boiler 10 is internally provided with a multi-stage superheater, and comprises a second high-pressure section superheater 401, a first high-pressure section superheater 402 and a low-pressure section superheater 405, wherein a steam outlet of the low-pressure section drum 16 is communicated with a steam inlet of the low-pressure section superheater 405, a steam outlet of the high-pressure section drum 18 is connected with a steam inlet of the first high-pressure section superheater 402, and a steam outlet of the first high-pressure section superheater 402 is communicated with a steam inlet of the second high-pressure section superheater 401;
the steam turbine 11 includes a high pressure cylinder 1101, a medium pressure cylinder 1102, and a low pressure cylinder;
the superheated steam outlet of the coke oven gas boiler 10 is communicated with the steam inlet of the steam turbine high-pressure cylinder 1101, the steam outlet of the steam turbine high-pressure cylinder 1101 is communicated with the steam inlet of the second high-pressure section superheater 401 of the dry quenching waste heat boiler 4, the superheated steam outlet of the second high-pressure section superheater 401 is communicated with the steam inlet of the steam turbine medium-pressure cylinder 1102, the steam outlet of the steam turbine medium-pressure cylinder 1102 is communicated with the steam inlet of the steam turbine low-pressure cylinder 1103, and the steam outlet of the low-pressure section superheater 405 of the dry quenching waste heat boiler 4 is also communicated with the steam inlet of the steam turbine low-pressure cylinder 1103.
In the thermal power generation system, the high-temperature section superheater of the dry quenching waste heat boiler is divided into two stages, the second high-pressure section superheater 401 of the dry quenching waste heat boiler is also used as a reheater of the coke oven gas boiler 10 after steam is acted in the high-pressure cylinder 1101, compared with a conventional independently arranged coke oven gas boiler and dry quenching waste heat boiler thermal system, no heat exchange surface is additionally arranged, the reheating of the steam is realized, the overall thermal efficiency of the whole power generation system is improved, the dryness of the final stage blades of the steam turbine is improved, the working condition of the final stage blades of the low-pressure cylinder of the steam turbine is improved, and the operation safety and stability of the steam turbine are improved.
In an alternative embodiment, the dry quenching furnace further comprises a primary dust remover 3, a secondary dust remover 5 and a circulating fan 6, wherein the primary dust remover 3 is communicated with a circulating gas outlet of the dry quenching furnace 2 and a flue gas inlet of the dry quenching waste heat boiler 4, one end of the secondary dust remover 5 is communicated with a flue gas outlet of the dry quenching waste heat boiler 4, the other end of the secondary dust remover 5 is communicated with an air inlet of the circulating fan 6, and an air outlet of the circulating fan 6 is communicated with a circulating gas inlet of the dry quenching furnace 2.
In an alternative embodiment of the invention, the coke oven gas purifying device further comprises a gas cabinet 9, wherein the gas cabinet 9 is arranged on a gas pipeline between the raw gas purifying device 8 and the gas boiler 10, a gas outlet of the raw gas purifying device 8 is communicated with a gas inlet of the gas cabinet 9, and a gas outlet of the gas cabinet 9 is communicated with a gas inlet of the coke oven gas boiler 10.
Fig. 2 shows a preferred embodiment of the thermal power generation system based on the integrated utilization of the residual heat and energy of the coke oven plant according to the present invention, and as shown in fig. 2, the thermal power generation system comprises: the coke oven 1, the dry quenching furnace 2, the primary dust remover 3, the dry quenching waste heat boiler 4, the secondary dust remover 5, the circulating fan 6, the raw gas waste heat recovery device 7, the gas purifying treatment device 8, the gas cabinet 9, the coke oven gas boiler 10, the steam turbine 11, the generator 12, the condenser 13, the condensate pump 14, the deoxidizing head 15, the low-pressure section drum 16, the first water feeding pump 17, the high-pressure section drum 18, the second water feeding pump 19, the high-pressure water feeding heater 20 and the circulating pump 21, wherein,
the high-temperature circulating gas outlet of the dry quenching furnace 2 is connected with the gas inlet of the dry quenching waste heat boiler 4 through a primary dust remover 3, and the gas outlet of the dry quenching waste heat boiler 4 is connected with the low-temperature circulating gas inlet of the dry quenching furnace 2 through a secondary dust remover 5 and a circulating fan 6, so that a circulating process of cooling gas of the dry quenching furnace is formed;
the raw gas waste heat recovery device 7 is a raw gas waste heat recovery device of a coke oven rising pipe, and is sequentially connected with the gas purifying treatment device 8 and the coke oven gas cabinet 9, and the coke oven gas cabinet 9 is connected with a gas inlet of the coke oven gas boiler 10 through a gas pipeline;
the coke oven gas boiler 10 is provided with a multi-stage heating surface along a flue gas flow, and at least comprises a gas boiler superheater 101 and a gas boiler economizer 102;
the dry quenching waste heat boiler 4 is internally provided with a multi-stage heating surface and at least comprises a second high-pressure section superheater 401, a first high-pressure section superheater 402, a high-pressure section evaporator 403, a high-pressure section economizer 404, a low-pressure section superheater 405, a low-pressure section evaporator 406 and a low-pressure section economizer 407 which are sequentially arranged along the flue gas flow;
the turbine 11 is divided into a high pressure cylinder 1101, a medium pressure cylinder 1102 and a low pressure cylinder 1103;
the steam outlet of the coke oven gas boiler superheater 101 is communicated with the steam inlet of the steam turbine high-pressure cylinder 1101, the steam outlet of the steam turbine high-pressure cylinder 1101 is communicated with the steam inlet of the second high-pressure section superheater 401 of the dry quenching waste heat boiler 4, the steam outlet of the first high-pressure section superheater 402 of the dry quenching waste heat boiler 4 is also communicated with the steam inlet of the second high-pressure section superheater 401, and the second high-pressure section superheater 401 of the dry quenching waste heat boiler is used as a second-stage superheater of the high-pressure section steam of the dry quenching waste heat boiler 4 and is also used as a reheater of the steam outlet of the steam turbine high-pressure cylinder 1101;
the superheated steam outlet of the second high-pressure section superheater 401 of the dry quenching waste heat boiler 4 is communicated with the steam inlet of the steam turbine intermediate pressure cylinder 1102, the steam outlet of the steam turbine intermediate pressure cylinder 1102 is communicated with the steam inlet of the steam turbine low pressure cylinder 1103, the steam outlet of the low-pressure section superheater 405 of the dry quenching waste heat boiler is also communicated with the steam inlet of the steam turbine low pressure cylinder 1103, a regenerative steam extraction port is arranged in the steam turbine intermediate pressure cylinder 1102, and the regenerative steam extraction port is communicated with the heating steam inlet of the high-pressure feed water heater 20;
the steam outlet of the low-pressure cylinder 1103 of the steam turbine is sequentially communicated with the condenser 13, the condensate pump 14, a low-pressure section economizer 407 in the dry quenching waste heat boiler 4 and a water inlet of a deoxidizing head 15 along a steam-water flow, and the deoxidizing head 15 is arranged above the low-pressure section drum 16;
the low pressure section drum 16 has a first water outlet 16-1, a second water outlet 16-2, a first downcomer orifice 16-3, a second downcomer orifice 16-4, a first riser orifice 16-5 and a second riser orifice 16-6, wherein:
the first water outlet 16-1 of the low-pressure section drum 16 is sequentially communicated with the high-pressure section economizer 404 and the water inlet of the high-pressure section drum 18 through a first water feed pump 17;
the second water outlet 16-2 of the low-pressure section boiler barrel 16 is communicated with the water inlet of the high-pressure feed water heater 20 through a second feed water pump 19, and the water outlet of the high-pressure feed water heater 20 is communicated with the feed water inlet of the coke oven gas boiler 10;
the first descending pipe orifice 16-3 of the low-pressure section boiler barrel 16 is communicated with the water inlet of the low-pressure section evaporator 406 through a descending pipe, and the steam outlet of the low-pressure section evaporator 406 is communicated with the first ascending pipe orifice 16-5 of the low-pressure section boiler barrel 16 through an ascending pipe, so as to form a low-pressure steam-water natural circulation loop;
the second descending pipe orifice 16-4 of the low-pressure section drum 16 is sequentially communicated with the circulating pump 21 and the water inlet of the raw gas waste heat recovery device 7, and the steam outlet of the raw gas waste heat recovery device 7 is communicated with the second ascending pipe orifice 16-6 of the low-pressure section drum 16 to form a low-pressure steam-water forced circulation loop.
According to the thermal power generation system, the steam system, the water supply system and the deoxidization system of the coke oven gas generator set, the dry quenching waste heat utilization unit and the raw coke oven gas waste heat recovery system are integrated in a highly coupled mode, the unit heat recovery system is greatly simplified under the condition that the whole thermal economy of the unit is not affected, and the low-pressure heat recovery system and the deoxidization system which are independently configured by a set of conventional coke oven gas generator set are omitted, so that the whole thermal system is simpler, and the engineering occupied area and the construction total cost are greatly reduced. In addition, the waste heat recovery system of the raw coke oven gas in the ascending pipe is designed into a low-pressure forced circulation system, so that the heat exchange efficiency of the waste heat recovery system of the raw coke oven gas in the ascending pipe can be improved, and the safe reliability of the operation of the heat exchanger can be ensured. And moreover, the low-pressure saturated steam generated by the coke oven rising pipe raw gas waste heat recovery system and the low-pressure saturated steam generated by the dry quenching waste heat boiler are collected and then enter the low-pressure section superheater together for superheating, and then the low-pressure saturated steam is used as the inlet steam of the low-pressure cylinder of the steam turbine, so that the power generation of the steam turbine is further improved, and the efficient utilization of steam resources is realized.
The process flow of the thermal power generation system shown in fig. 2 is as follows:
the hot coke pushed out of the carbonization chamber of the coke oven 1 is sent into a dry quenching furnace 2, cooled by circulating gas, and high-temperature circulating gas (for example, about 900 ℃) from the dry quenching furnace 2 enters a dry quenching waste heat boiler 4 for heat exchange after coarse-particle coke powder is separated by a primary dust remover 3, so that a heat source is provided for the dry quenching waste heat boiler 4; the low-temperature circulating gas (for example, about 150 ℃) discharged after the heat absorption and the temperature reduction of the dry quenching waste heat boiler 4 is further separated into fine-particle coke powder through the secondary dust remover 5, and then the fine-particle coke powder is pressurized through the circulating fan 6 and is returned to the air inlet at the bottom of the dry quenching furnace 2, and is continuously used for cooling the hot coke in the dry quenching furnace 2, so that a circulating cooling process is formed;
raw gas coming out from the upper part of the coke oven 1 enters a raw gas waste heat recovery device 7, the temperature of the raw gas is reduced to about 500 ℃ from about 800 ℃, then enters a gas purification treatment device 8, the cooled and purified coke oven gas in the gas purification treatment device enters a coke oven gas cabinet 9 for caching, and the coke oven gas coming out from the coke oven gas cabinet 9 is sent into a coke oven gas boiler 10 for combustion and is used as main fuel of the coke oven gas boiler 10;
superheated steam generated by the coke oven gas boiler 10 is taken as main steam to enter a turbine high-pressure cylinder 1101, and steam discharged by the turbine high-pressure cylinder 1101 and outlet steam of a first high-pressure section superheater 402 in the dry quenching waste heat boiler 4 are combined and then enter a second high-pressure section superheater 401 together for reheating; the outlet steam of the second high-pressure section superheater 401 enters a turbine intermediate pressure cylinder 1102, is combined with the outlet steam of the low-pressure section superheater 405 in the dry quenching waste heat boiler after the turbine intermediate pressure cylinder does work and reduces pressure, and then enters a turbine low pressure cylinder 1103 together as the low-pressure inlet steam of the turbine 11; the exhaust steam of the low-pressure cylinder 1103 of the steam turbine enters a condenser 13, and is condensed into condensed water in the condenser 13;
the condensed water in the condenser 13 is pressurized by a condensed water pump 14 and sent to a low-pressure section economizer 407 of the dry quenching waste heat boiler for preheating and then sent to a deoxidizing head 15 for deoxidizing, the deoxidized water falls into a low-pressure section drum 16 arranged below the deoxidizing head, and the low-pressure section drum 16 also serves as a deoxidizing water tank; a natural circulation process is formed between the low-pressure section drum 16 and the low-pressure section evaporator 406 through a down pipe and a rising pipe, steam-water separation is carried out on a steam-water mixture generated by the low-pressure section evaporator 406 in the low-pressure section drum 16, generated saturated steam enters the deoxidizing head 15, and the condensed water from the low-pressure section economizer 407 is deoxidized by heating power to form a self-deoxidizing mode;
the separated saturated steam of the low-pressure section drum 16 is removed from the part consumed by the deoxygenation, and the residual steam enters a low-pressure section superheater 405 for superheating and then enters a low-pressure cylinder 1103 of the steam turbine together after being combined with the exhaust steam of the medium-pressure cylinder 1102 of the steam turbine;
the first water outlet 16-1 of the low-pressure section boiler barrel 16 is pressurized by a first water feeding pump 17 and then sequentially sent to a high-pressure section economizer 404 and a high-pressure section boiler barrel 18 of the dry quenching waste heat boiler, a natural circulation process is formed between the high-pressure section boiler barrel 18 and the high-pressure section evaporator 403 through a down pipe and a rising pipe, steam-water separation is carried out on a steam-water mixture generated by the high-pressure section evaporator 403 in the high-pressure section boiler barrel 18, and generated saturated steam sequentially enters a first high-pressure section superheater 402 and a second high-pressure section superheater 401 for two-stage superheating;
the second water outlet 16-2 of the low pressure section drum 16 is pressurized by the second water feed pump 19 and then sent to the high pressure water feed heater 20, and the high pressure water feed heater 20 heats and then enters the coke oven gas boiler 10 as water feed
The low-pressure section drum 16 sends water to the raw gas waste heat recovery device 7 through the circulating pump 21 for absorbing sensible heat of the raw gas, and the raw gas waste heat recovery device 7 is vaporized and evaporated to form a steam-water mixture which is returned to the low-pressure section drum 16 to form a forced circulation vaporization cooling process for the high-temperature raw gas in the rising pipe;
the steam turbine 11 is coaxially connected with the generator 12 and drives the generator to rotate for power generation.
The thermal power generation system based on the high residual energy of the coke oven waste heat optimizes the coexistence mode of the conventional gas power generation, the dry quenching waste heat power generation and the raw coke oven riser waste gas waste heat recovery system, so that a set of steam turbine generator unit is omitted, and a steam system, a water supply system and an oxygen removal system of the coke oven gas generator unit, the dry quenching waste heat utilization unit and the raw coke oven gas waste heat recovery system are highly coupled, thereby greatly simplifying the unit heat recovery system, and being equivalent to omitting a set of low-pressure heater and oxygen remover which are independently configured by the conventional gas generator unit, so that the system is simpler, and the engineering occupation area and the construction total cost are greatly reduced; in addition, the high-pressure section superheater of the dry quenching waste heat boiler is divided into two stages, and the final-stage superheater of the dry quenching waste heat boiler is also used as a reheater for generating steam of the coke oven gas boiler, so that the overall thermal efficiency of a power generation system is improved, the dryness of final-stage blades of a steam turbine is improved, the working condition of final-stage blades of a low-pressure cylinder of the steam turbine is improved, and the operation safety and stability of the steam turbine are improved; in addition, the raw gas waste heat recovery system of the coke oven ascending pipe is designed into a low-pressure forced circulation system, so that the heat exchange efficiency of the raw gas waste heat recovery system of the coke oven ascending pipe can be improved, and the safe reliability of the operation of the raw gas waste heat recovery system can be ensured.
While the foregoing disclosure shows exemplary embodiments of the invention, it should be noted that various changes and modifications could be made herein without departing from the scope of the invention as defined by the appended claims. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Claims (9)
1. The thermal power generation system based on the integrated utilization of the waste heat and the waste energy of the coke oven plant is characterized by comprising a coke oven, a dry quenching furnace, a dry quenching waste heat boiler, a raw gas waste heat recovery device, a raw gas purifying treatment device, a coke oven gas boiler, a steam turbine and a generator,
the coke discharging port of the coke oven is connected with the coke loading port of the dry quenching furnace, and hot coke generated by the coke oven is cooled in the dry quenching furnace through circulating gas;
the circulating gas outlet of the dry quenching furnace is communicated with the flue gas inlet of the dry quenching waste heat boiler, the flue gas outlet of the dry quenching waste heat boiler is communicated with the circulating gas inlet of the dry quenching furnace, so that a circulating loop is formed, and the sensible heat of the circulating gas is recycled by the dry quenching waste heat boiler;
the raw gas outlet of the coke oven is communicated with the gas inlet of the raw gas waste heat recovery device, an evaporation heating surface is arranged in the raw gas waste heat recovery device, and sensible heat of high-temperature raw gas in the coke oven is recovered;
the gas outlet of the raw gas waste heat recovery device is communicated with the gas inlet of the raw gas purifying treatment device, and the raw gas purifying treatment device purifies and cools the raw gas from the raw gas waste heat recovery device;
the gas outlet of the raw gas purifying treatment device is communicated with the gas inlet of the coke oven gas boiler, and purified gas is sent into the coke oven gas boiler;
the raw gas waste heat recovery device is communicated with the dry quenching waste heat boiler through a boiler barrel, and a steam-water mixture generated by the raw gas waste heat recovery device is sent into the dry quenching waste heat boiler for overheating after being subjected to steam-water separation in the boiler barrel;
the steam inlet of the steam turbine is respectively communicated with the superheated steam outlet of the coke oven gas boiler and the superheated steam outlet of the dry quenching waste heat boiler;
the steam turbine is connected with the generator to drive the generator to generate electricity,
the boiler barrel comprises a low-pressure section boiler barrel and a high-pressure section boiler barrel; the dry quenching waste heat boiler is internally provided with a multi-stage superheater, and comprises a second high-pressure section superheater, a first high-pressure section superheater and a low-pressure section superheater, wherein a steam outlet of the low-pressure section boiler barrel is communicated with a steam inlet of the low-pressure section superheater, a steam outlet of the high-pressure section boiler barrel is communicated with a steam inlet of the first high-pressure section superheater, and a steam outlet of the first high-pressure section superheater is communicated with a steam inlet of the second high-pressure section superheater; the steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; the superheated steam outlet of the coke oven gas boiler is communicated with the steam inlet of the high-pressure cylinder of the steam turbine, the steam outlet of the high-pressure cylinder of the steam turbine is communicated with the steam inlet of the second high-pressure section superheater of the dry quenching waste heat boiler, the superheated steam outlet of the second high-pressure section superheater is communicated with the steam inlet of the medium-pressure cylinder of the steam turbine, the steam outlet of the medium-pressure cylinder of the steam turbine is communicated with the steam inlet of the low-pressure cylinder of the steam turbine, and the steam outlet of the low-pressure section superheater of the dry quenching waste heat boiler is also communicated with the steam inlet of the low-pressure cylinder of the steam turbine.
2. The thermal power generation system of claim 1, wherein the dry quenching waste heat boiler further comprises a high pressure section evaporator, a high pressure section economizer, a low pressure section evaporator, a low pressure section economizer, the second high pressure section superheater, the first high pressure section superheater, the high pressure section evaporator, the high pressure section economizer, the low pressure section superheater, the low pressure section evaporator, the low pressure section economizer being arranged in sequence along a flue gas flow path inside the waste heat boiler.
3. The thermal power generation system of claim 2, further comprising a condenser, a condensate pump, an oxygen removal head, and a first feedwater pump, wherein,
the deoxidizing head is arranged above the low-pressure section boiler barrel which also serves as a deoxidizing water tank;
the steam outlet of the low-pressure cylinder of the steam turbine is sequentially communicated with the water inlets of the condenser, the condensate pump, the low-pressure section economizer and the deoxidizing head along a steam-water flow;
the first descending pipe orifice of the low-pressure section boiler barrel is communicated with the water inlet of the low-pressure section evaporator through a descending pipe, and the steam outlet of the low-pressure section evaporator is communicated with the first ascending pipe orifice of the low-pressure section boiler barrel through an ascending pipe to form a low-pressure steam-water natural circulation loop;
the first water outlet of the low-pressure section boiler barrel is sequentially communicated with the high-pressure section economizer and the water inlet of the high-pressure section boiler barrel through a first water supply pump;
the high-pressure section boiler barrel is communicated with the water inlet of the high-pressure section evaporator through a down pipe, and the steam outlet of the high-pressure section evaporator is communicated with the ascending pipe orifice of the high-pressure section boiler barrel through an ascending pipe to form a high-pressure steam-water natural circulation loop.
4. A thermal power generation system according to claim 3, wherein an auxiliary heating steam interface is arranged on the deaeration head and is communicated with an external auxiliary steam source to be used as starting steam of the whole set of thermal power generation system or a standby steam source when a dry quenching waste heat boiler has a problem.
5. The thermal power generation system according to claim 1, further comprising a circulating pump, wherein the second descending pipe orifice of the low-pressure section drum is sequentially communicated with the circulating pump and the water inlet of the raw gas waste heat recovery device, and the steam outlet of the raw gas waste heat recovery device is communicated with the second ascending pipe orifice of the low-pressure section drum to form a low-pressure steam-water forced circulation loop.
6. The thermal power generation system of claim 1, further comprising a second feedwater pump and a high pressure feedwater heater, wherein the second water outlet of the low pressure stage drum communicates with the water inlet of the high pressure feedwater heater through the second feedwater pump, and the water outlet of the high pressure feedwater heater communicates with the feedwater inlet of the coke oven gas boiler.
7. The thermal power generation system of claim 6, wherein a regenerative extraction port is provided on the turbine intermediate pressure cylinder, the regenerative extraction port being in communication with the heating steam inlet of the high pressure feedwater heater.
8. The thermal power generation system of claim 1, further comprising a primary dust remover, a secondary dust remover and a circulating fan, wherein the primary dust remover is communicated with a circulating gas outlet of the dry quenching furnace and a flue gas inlet of the dry quenching waste heat boiler, one end of the secondary dust remover is communicated with a flue gas outlet of the dry quenching waste heat boiler, the other end of the secondary dust remover is communicated with an air inlet of the circulating fan, and an air outlet of the circulating fan is communicated with a circulating gas inlet of the dry quenching furnace.
9. The thermal power generation system of claim 1, further comprising a gas cabinet disposed on a gas line between the raw gas purification treatment device and the gas boiler, a gas outlet of the raw gas purification treatment device being in communication with a gas inlet of the gas cabinet, a gas outlet of the gas cabinet being in communication with a gas inlet of the coke oven gas boiler.
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