CN110500149B - Coal low-temperature carbonization and power generation co-production system - Google Patents
Coal low-temperature carbonization and power generation co-production system Download PDFInfo
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- CN110500149B CN110500149B CN201910889042.8A CN201910889042A CN110500149B CN 110500149 B CN110500149 B CN 110500149B CN 201910889042 A CN201910889042 A CN 201910889042A CN 110500149 B CN110500149 B CN 110500149B
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- 239000003245 coal Substances 0.000 title claims abstract description 89
- 238000003763 carbonization Methods 0.000 title claims abstract description 41
- 238000010248 power generation Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 122
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 61
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 61
- 238000001035 drying Methods 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims description 43
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 42
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 239000011280 coal tar Substances 0.000 abstract description 4
- 239000003034 coal gas Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000000197 pyrolysis Methods 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000269793 Cryothenia peninsulae Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010980 drying distillation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
-
- 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
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- 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
- F01D15/08—Adaptations for driving, or combinations with, pumps
-
- 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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
-
- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
- F04D25/045—Units comprising pumps and their driving means the pump being fluid-driven the pump wheel carrying the fluid driving means, e.g. turbine blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Solid Materials (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The technical scheme of the invention discloses a coal low-temperature carbonization and power generation co-production system, which comprises the following components: a supercritical carbon dioxide circulating generator set and a coal carbonization device. The supercritical carbon dioxide circulating generator set has high generating efficiency, adopts the parameters of 30MPa/620 ℃/620 ℃/620 ℃, supplies coal with less than 260g/kWh, has high energy utilization rate of coal, can adopt the materials of the existing supercritical turbine set, has the equipment cost equivalent to that of the existing supercritical turbine set, uses boiler coal to generate heat for graded utilization, uses the medium-temperature heat for generating electricity by the supercritical carbon dioxide circulating generator set, uses the medium-temperature heat for low-temperature carbonization of coal, uses the low-temperature heat for drying the coal, and uses the system to operate so as to generate electric power, and the produced coal gas, tar and semicoke with higher economic value can be used for improving the quality of low-rank coal and further improving the energy utilization rate of the coal.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a coal low-temperature carbonization and power generation co-production system.
Background
Coal-fired power generation is one of the main power supply modes in China, and still occupies the largest power generation share in a period of time at present and in the future, but the coal-fired power generation is facing the severe situation of quality improvement and efficiency improvement and transformation development. The reserve of low-rank coal in China is large, and the reserve of the low-rank coal accounts for about 55% of the total coal reserve, wherein lignite accounts for about 14%, and the low-rank coal is produced in northwest and inner Mongolia areas. The low-rank coal has sufficient supply and low price, and has obvious cost advantages for coal-fired power generation, but the low-rank coal has high moisture, high volatile matter, high ash content, low heat value, poor long-distance conveying economy and low utilization rate, wherein the pithead power generation is the main utilization mode at present. Along with the continuous reduction of coal resources and the great increase of bituminous coal prices in China, the effective and reasonable utilization of low-rank coal is increasingly important, and the development of efficient upgrading technology can effectively relieve the situation of shortage of high-quality power coal supply and has important significance for improving the strategic safety of energy sources.
In recent years, novel supercritical carbon dioxide cycle power generation technology is rapidly developed, the power generation unit system is simple, compact in structure, high in efficiency and capable of air cooling, can be integrated with a coal-fired boiler, replaces a turbine unit to form a more advanced coal-fired power generation system, and the 600 ℃ grade supercritical carbon dioxide cycle unit can reach the power generation efficiency of the 700 ℃ grade supercritical unit. The supercritical carbon dioxide circulation has the characteristic of deep backheating, the temperature of the working medium entering the boiler is higher, the temperature of the boiler exhaust gas is high, the heat is used for upgrading raw coal, and the efficient, clean and economic upgrading process is hopeful to be realized.
Disclosure of Invention
In view of the shortcomings of the prior art, the technical scheme aims to solve the technical problem that a supercritical carbon dioxide circulating generator set is combined with a low-rank coal carbonization device to co-produce electric power and coal pyrolysis products.
In order to solve the technical problems, the invention provides a coal low-temperature carbonization and power generation co-production system, which comprises: a supercritical carbon dioxide circulating generator set and a coal carbonization device;
the supercritical carbon dioxide cycle generator set comprises a main compressor, an outlet of the main compressor is connected with a high-pressure side inlet of a low-temperature heat regenerator, a high-pressure side outlet of the low-temperature heat regenerator is connected with a high-pressure side inlet of the high-temperature heat regenerator, a high-pressure side outlet of the high-temperature heat regenerator is connected with a working medium inlet of a boiler, a working medium outlet of the boiler is connected with an air inlet of a high-pressure carbon dioxide turbine, an air outlet of the high-pressure carbon dioxide turbine is connected with a working medium inlet of a primary reheater, an air outlet of the primary reheater is connected with a working medium inlet of a secondary reheater, a working medium outlet of the secondary reheater is connected with an air inlet of the low-pressure carbon dioxide turbine, an air outlet of the low-pressure carbon dioxide turbine is connected with a low-pressure side inlet of the high-temperature heat regenerator, a low-pressure side outlet of the high-temperature heat regenerator is connected with an inlet of the precooler, and the other path is connected with an inlet of the reheater, and an outlet of the precooler is connected with an inlet of the high-pressure heat regenerator;
the coal carbonization device comprises a coal drying pipe, the outlet of the coal drying pipe is connected with a first cyclone, the outlet of the first cyclone is connected with a coal feeder, the outlet of the coal feeder is divided into two paths, one path is connected with the fuel inlet of a boiler, the other path is connected with the dry coal inlet of a carbonization tank, the outlet of the carbonization tank is connected with the carbocoal inlet of a second carbocoal heating lifting pipe, the outlet of the second carbocoal heating lifting pipe is connected with the inlet of a second hot carbocoal collecting tank, the carbocoal outlet of the second hot carbocoal collecting tank is connected with the carbocoal inlet of the first carbocoal heating lifting pipe, the flue gas outlet of the first carbocoal heating lifting pipe is connected with the inlet of the first hot carbocoal collecting tank, the flue gas outlet of the second hot carbocoal collecting tank is connected with the inlet of a third cyclone, the gas outlet of the third cyclone is connected with the inlet of a product separator, the flue gas outlet of the second carbocoal heating lifting pipe is connected with the inlet of the second cyclone, the flue gas outlet of the second carbocoal heating lifting pipe is connected with the air inlet of the second cyclone, the air inlet of the second cyclone is connected with the air heater, the flue gas outlet of the air heater is connected with the air inlet of the air heater, and the air heater is connected with the air inlet of the air heater.
Optionally, the supercritical carbon dioxide cycle generator set further comprises a generator, and the generator is connected with the main compressor.
Optionally, the high pressure carbon dioxide turbine, the medium pressure carbon dioxide turbine, the low pressure carbon dioxide turbine, the recompressor, the main compressor and the generator are coaxially arranged.
Optionally, the supercritical carbon dioxide circulating generator set adopts high-order arrangement. The high-level arrangement according to the technical scheme of the invention is arranged at a position higher than one third of the position of the boiler.
Optionally, the heat required by the supercritical carbon dioxide circulating generator set for power generation, the heat required by the carbonization of coal and the heat required by the drying of coal are gradually decreased in grade and are all derived from the heat generated by the boiler coal.
Compared with the prior art, the coal low-temperature carbonization and power generation co-production system has the following beneficial effects:
the supercritical carbon dioxide circulating generator set has high generating efficiency, adopts parameters of 30MPa/620 ℃/620 ℃/620 ℃ and power supply coal consumption of below 260g/kWh, has high energy utilization rate of coal, can adopt the materials of the existing supercritical turbine set, and has equipment cost equivalent to that of the existing supercritical turbine set.
The boiler fire coal is used for generating heat and grading, high-temperature heat is used for generating power by the supercritical carbon dioxide circulating generator set, medium-temperature heat is used for low-temperature carbonization of coal, low-temperature heat is used for drying coal, the system is operated to generate electric power, and the produced coal gas, tar and semicoke with higher economic value are used for improving the quality of low-rank coal, so that the energy utilization rate of the coal is further improved.
Drawings
FIG. 1 is a schematic diagram of a coal low-temperature carbonization and power generation co-production system according to an embodiment of the invention;
wherein: 1-coal drying pipe, 2-first cyclone, 3-coal feeder, 4-carbonization tank, 5-first semicoke heating riser, 6-first hot semicoke collecting tank, 7-second semicoke heating riser, 8-second hot semicoke collecting tank, 9-second cyclone, 10-third cyclone, 11-carbonization product separator, 21-main compressor, 22-low temperature regenerator, 23-high temperature regenerator, 24-high pressure carbon dioxide turbine, 25-medium pressure carbon dioxide turbine, 26-low pressure carbon dioxide turbine, 27-recompressor, 28-precooler, 29-generator, 30-boiler, 31-fan, 32-selective catalytic denitrator, 33-air preheater, 34-flue gas condenser, 35-mixer.
Detailed Description
The coal low-temperature carbonization and power generation co-production system according to the technical scheme of the invention is described in detail below by combining with the embodiment.
As shown in fig. 1, the low-temperature carbonization and power generation co-production system for coal according to the embodiment of the invention comprises: a supercritical carbon dioxide circulating generator set and a coal carbonization device.
The supercritical carbon dioxide circulating generator set comprises a main compressor 21, an outlet of the main compressor 21 is connected with a high-pressure side inlet of a low-temperature heat regenerator 22, a high-pressure side outlet of the low-temperature heat regenerator 22 is connected with a high-pressure side inlet of a high-temperature heat regenerator 23, a high-pressure side outlet of the high-temperature heat regenerator 23 is connected with a working medium inlet of a boiler 30, a working medium outlet of the boiler 30 is connected with an air inlet of a high-pressure carbon dioxide turbine 24, an air outlet of the high-pressure carbon dioxide turbine 24 is connected with a primary reheater working medium inlet of the boiler 30, an air outlet of the medium-pressure carbon dioxide turbine 25 is connected with a secondary reheater working medium inlet of the boiler 30, a secondary reheater working medium outlet of the boiler 30 is connected with an air inlet of a low-pressure carbon dioxide turbine 26, an air outlet of the low-pressure side of the low-temperature heat regenerator 23 is connected with a low-pressure side inlet of the low-temperature heat regenerator 22, and the low-pressure side outlet of the low-temperature heat regenerator 22 is connected with two paths, which are respectively connected with an inlet of a precooler 28 and an inlet of a re-compressor 27; the outlet of the precooler 28 is connected to the inlet of the main compressor 21 and the outlet of the recompression 27 is connected to the high-pressure side inlet of the high-temperature regenerator 23.
The supercritical carbon dioxide cycle generator set further comprises a generator 29, the generator 29 being connected to the main compressor 21. And the high pressure carbon dioxide turbine 24, the medium pressure carbon dioxide turbine 25, the low pressure carbon dioxide turbine 26, the recompressor 27, the main compressor 21 and the generator 29 are coaxially arranged.
The supercritical carbon dioxide circulating generator set adopts high-position arrangement, so that the length and the pressure loss of a carbon dioxide working medium pipeline are reduced.
The coal carbonization device of the embodiment of the invention comprises a coal drying pipe 1, an outlet of the coal drying pipe 1 is connected with a first cyclone 2, an outlet of the first cyclone 2 is connected with a coal feeder 3, an outlet of the coal feeder 3 is connected with two paths, one path is connected with a fuel inlet of a boiler 30, the other path is connected with a dry coal inlet of a carbonization tank 4, an outlet of the carbonization tank 4 is connected with a semicoke inlet of a second semicoke heating lifting pipe 7, an outlet of the second semicoke heating lifting pipe 7 is connected with an inlet of a second thermal semicoke collecting tank 8, a semicoke outlet of the second thermal semicoke collecting tank 8 is connected with a semicoke inlet of a first semicoke heating lifting pipe 5, a flue gas outlet of the first thermal semicoke collecting tank 6 is connected with a flue gas inlet of the second semicoke heating lifting pipe 7, an outlet of the first semicoke heating lifting pipe 5 is connected with an inlet of the first thermal semicoke collecting tank 6, the flue gas outlet of the second thermal semicoke collecting tank 8 is connected with the inlet of the second cyclone 9, the gas outlet of the dry distillation product of the dry distillation tank 4 is connected with the inlet of the third cyclone 10, the gas outlet of the third cyclone 10 is connected with the inlet of the dry distillation product separator 11, the flue gas outlet of the second cyclone 9 is divided into two paths, one path is connected with the inlet of the mixer 35, the other path is connected with the flue gas inlet of the coal drying pipe 1, the flue gas outlet of the first cyclone 2 is connected with the inlet of the fan 31, the outlet of the fan 31 is connected with the flue gas inlet of the flue gas condenser 34, the flue gas outlet of the flue gas condenser 34 is connected with the inlet of the mixer 35, the outlet of the mixer 35 is connected with the inlet of the selective catalytic denitrator 32, the outlet of the selective catalytic denitrator 32 is connected with the flue gas inlet of the air preheater 33, the air outlet of the flue gas condenser 34 is connected with the air inlet of the air preheater 33, the air outlet of the air preheater 33 is connected to the air inlet of the boiler 30.
The working process of the coal low-temperature carbonization and power generation co-production system in the embodiment of the invention is described in detail by taking brown coal as an example:
in the supercritical carbon dioxide circulating unit, a split-flow recompression secondary reheating circulation mode is adopted, carbon dioxide working medium enters a main compressor 21 for pressurization, the carbon dioxide working medium is discharged through an outlet of the main compressor 21 and enters a low-temperature regenerator 22, the low-temperature Duan Reliang of the working medium is discharged through a low-temperature regenerator 22 for absorbing low-pressure carbon dioxide turbine 26, the low-temperature Duan Reliang is converged with the working medium at an outlet of a recompression 27, the working medium enters a high-temperature regenerator 23 and absorbs heat of a high-temperature section of the working medium discharged through the low-pressure carbon dioxide turbine 26, the heat of the working medium discharged from the high-temperature regenerator 23 is absorbed by a boiler 30 and reaches 620 ℃, the pressure is 30MPa, the working medium enters a high-pressure carbon dioxide turbine 24 for doing work, the working medium discharged from the high-pressure carbon dioxide turbine 24 is reheated to 620 ℃ by the boiler 30 and enters the low-pressure carbon dioxide turbine 26 for doing work, the exhaust pressure of the low-pressure carbon dioxide turbine 26 is 7.9MPa, the heat is released by the high-temperature regenerator 23 and the low-temperature regenerator 22, and the working medium is divided into two paths: one enters the recompressor 27 and the other enters the precooler 28 to cool to 32 ℃ and returns to the main compressor 21. The high pressure carbon dioxide turbine 24, the medium pressure carbon dioxide turbine 24 and the low pressure carbon dioxide turbine 26 apply work to drive the generator 29, the main compressor 21 and the recompression 27.
Meanwhile, in the coal carbonization device, raw coal is dried through a coal drying pipe 1 and lifted into a first cyclone 2, the first cyclone 2 feeds separated coal into a coal feeder 3, flue gas from the first cyclone 2 enters a fan 31, then enters an air condenser 34 to separate out part of water condensation, the coal feeder 3 respectively supplies dry coal to a boiler 30 for combustion and a carbonization tank 4 for carbonization, hot flue gas with the discharge temperature of about 600 ℃ from the boiler 30 enters the bottom of a first semicoke heating lifting pipe 5 to heat semicoke from a second thermal semicoke collecting tank 8 to about 540 ℃ and lifted to a first thermal semicoke collecting tank 6, the first thermal semicoke collecting tank 6 outputs part of semicoke products, the rest of the semicoke products enter the carbonization tank 4 to mix with dry coal and heat the dry coal for carbonization, and gaseous products with the temperature of about 460 ℃ enter a third cyclone 10, semicoke enters the bottom of a second semicoke heating riser 7, is heated to about 500 ℃ by hot flue gas from a first hot semicoke collecting tank 6 and is lifted to a second hot semicoke collecting tank 8, semicoke is output from the second hot semicoke collecting tank 8 to the bottom of the first semicoke heating riser 5, flue gas at about 500 ℃ is output from the second hot semicoke collecting tank 8 and enters a second cyclone 9, the flue gas output from the second cyclone 9 is divided into two paths, one path enters the bottom of a coal drying pipe 1 for drying and lifting raw coal, the flue gas enters a mixer 35 for mixing with the other path after passing through a first cyclone 2, a fan 31 and an air condenser 34, the flue gas from the mixer enters a selective catalytic denitrator 32 for denitration, the flue gas enters an air preheater 33 for heating air preheated by the flue gas condenser 34, gas products from a third cyclone 10 enter a dry distillation product separator 11 for producing coal gas and tar, and the coal tar are discharged from the first hot semicoke collecting tank 6, the second cyclone 9, the third cyclone 10 outputs semicoke. The gas, tar and semicoke can be further processed for chemical industry, fuel and other industrial purposes.
In the embodiment, the heat in the temperature range from 350 ℃ to 600 ℃ in the combustion heat of the dry coal is used for drying and destructive distillation of raw coal, the rest heat is used for power generation of a supercritical carbon dioxide circulating unit, the power generation efficiency can reach 48.5% (LHV), and the power supply coal consumption is 254g/kWh.
While specific embodiments of the invention have been described in detail, it will be appreciated that those skilled in the art, upon attaining an understanding of the principles of the invention, may readily make numerous modifications and variations to the present invention. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (5)
1. A coal low temperature carbonization and power generation co-production system, comprising: a supercritical carbon dioxide circulating generator set and a coal carbonization device;
the supercritical carbon dioxide cycle generator set comprises a main compressor, an outlet of the main compressor is connected with a high-pressure side inlet of a low-temperature heat regenerator, a high-pressure side outlet of the low-temperature heat regenerator is connected with a high-pressure side inlet of the high-temperature heat regenerator, a high-pressure side outlet of the high-temperature heat regenerator is connected with a working medium inlet of a boiler, a working medium outlet of the boiler is connected with an air inlet of a high-pressure carbon dioxide turbine, an air outlet of the high-pressure carbon dioxide turbine is connected with a working medium inlet of a primary reheater, an air outlet of the primary reheater is connected with a working medium inlet of a secondary reheater, a working medium outlet of the secondary reheater is connected with an air inlet of the low-pressure carbon dioxide turbine, an air outlet of the low-pressure carbon dioxide turbine is connected with a low-pressure side inlet of the high-temperature heat regenerator, a low-pressure side outlet of the high-temperature heat regenerator is connected with an inlet of the precooler, and the other path is connected with an inlet of the reheater, and an outlet of the precooler is connected with an inlet of the high-pressure heat regenerator;
the coal carbonization device comprises a coal drying pipe, the outlet of the coal drying pipe is connected with a first cyclone, the outlet of the first cyclone is connected with a coal feeder, the outlet of the coal feeder is divided into two paths, one path is connected with the fuel inlet of a boiler, the other path is connected with the dry coal inlet of a carbonization tank, the outlet of the carbonization tank is connected with the carbocoal inlet of a second carbocoal heating lifting pipe, the outlet of the second carbocoal heating lifting pipe is connected with the inlet of a second hot carbocoal collecting tank, the carbocoal outlet of the second hot carbocoal collecting tank is connected with the carbocoal inlet of a first carbocoal heating lifting pipe, the flue gas outlet of the first hot carbocoal collecting tank is connected with the flue gas inlet of the second carbocoal heating lifting pipe, the dry carbonization product gas outlet of the carbonization tank is connected with the inlet of a third cyclone, the outlet of the second cyclone is connected with the flue gas inlet of the first cyclone, the flue gas outlet of the flue gas inlet of the first cyclone is connected with the flue gas outlet of the second cyclone is connected with the flue gas inlet of the second cyclone, the flue gas outlet of the flue gas separator is connected with the flue gas inlet of the second cyclone, the flue gas separator is connected with the flue gas inlet of the flue gas separator is connected with the flue gas inlet of the flue gas separator, the air outlet of the air preheater is connected with the air inlet of the boiler; hot flue gas discharged by the boiler enters the bottom of the first semicoke heating lifting pipe; and outputting part of semicoke products by the first thermal semicoke collecting tank, mixing the rest of semicoke products with dry coal by entering the carbonization tank, and heating the dry coal to dry distill the dry coal.
2. The coal cryogenic retorting and power generation cogeneration system of claim 1, wherein the supercritical carbon dioxide cycle power generation unit further comprises a generator connected to the main compressor.
3. The coal cryogenic retorting and power generation co-generation system of claim 2, wherein said high pressure carbon dioxide turbine, said medium pressure carbon dioxide turbine, said low pressure carbon dioxide turbine, said recompressor, said main compressor and generator are coaxially arranged.
4. The coal low-temperature carbonization and power generation co-production system according to claim 1, wherein the supercritical carbon dioxide circulation generator set adopts a high-level arrangement.
5. The coal low-temperature carbonization and power generation co-production system according to claim 1, wherein the heat required by the supercritical carbon dioxide circulation generator set for power generation, the heat required by carbonization of coal and the heat required by drying of coal are sequentially reduced in grade and are all derived from the heat generated by the coal burning of the boiler.
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| CN201910889042.8A CN110500149B (en) | 2019-09-19 | 2019-09-19 | Coal low-temperature carbonization and power generation co-production system |
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| CN201910889042.8A CN110500149B (en) | 2019-09-19 | 2019-09-19 | Coal low-temperature carbonization and power generation co-production system |
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| CN110500149B true CN110500149B (en) | 2024-02-27 |
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