CN210768960U - Coal-fired power generation system with carbon capturing device - Google Patents
Coal-fired power generation system with carbon capturing device Download PDFInfo
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- CN210768960U CN210768960U CN201920696629.2U CN201920696629U CN210768960U CN 210768960 U CN210768960 U CN 210768960U CN 201920696629 U CN201920696629 U CN 201920696629U CN 210768960 U CN210768960 U CN 210768960U
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000010248 power generation Methods 0.000 title claims abstract description 45
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 464
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 214
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 214
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003546 flue gas Substances 0.000 claims abstract description 37
- 239000003245 coal Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 235000011089 carbon dioxide Nutrition 0.000 claims description 36
- 239000007789 gas Substances 0.000 claims description 35
- 238000009833 condensation Methods 0.000 claims description 29
- 230000005494 condensation Effects 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 25
- 238000012546 transfer Methods 0.000 claims description 17
- 238000005338 heat storage Methods 0.000 claims description 11
- 238000005262 decarbonization Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000002918 waste heat Substances 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 20
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Abstract
The utility model provides a coal-fired power generation system of carbon device is caught in area, including supercritical carbon dioxide circulation subsystem and catch the carbon subsystem. The supercritical carbon dioxide recycle subsystem includes a low pressure ratio supercritical carbon dioxide loop and a high pressure ratio supercritical carbon dioxide loop. The carbon capture subsystem comprises a liquefied air cooling loop, a liquefied air device waste heat recovery loop and a desublimation carbon capture loop. The coal-fired boiler supplies heat to the supercritical carbon dioxide circulation subsystem for power generation, and the flue gas discharged by the coal-fired boiler is decarbonized by the carbon capturing subsystem. The redundant heat and cold of the carbon capture subsystem are provided for the supercritical carbon dioxide circulation subsystem, so that the power generation efficiency of the supercritical carbon dioxide circulation subsystem is improved. The air liquefaction device can increase the load during the power generation valley, reduce the load during the power generation peak to the energy consumption cost is saved. Utilize the utility model provides a system, the coal fired power plant of carbon is caught in area can realize the zero carbon of high efficiency row electricity generation of coal.
Description
Technical Field
The utility model relates to a coal-fired power generation system and method of carbon device is caught in area belongs to clean coal-fired power generation technical field.
Background
In 2018, 10 and 8 months, the international commission on climate change (IPCC) issued "special report on global warming at 1.5 ℃ in korea renchu". Reports show that if climate warming continues at the present rate, the global air temperature is expected to rise by 1.5 degrees celsius between 2030 and 2052 years compared to the level before industrialization. Controlling global temperature rise to within 1.5 degrees centigrade provides more benefits to humans and ecosystems, and related experts call for actions from countries and endeavors to control temperature rise to within 1.5 degrees centigrade. In this context, the control of greenhouse gas emissions is not easy, and carbon dioxide is the largest greenhouse effect contribution source, and the emission reduction task is the first time. Under the current situation, while renewable energy power generation is vigorously developed in China, coal-fired power generation is still an indispensable energy utilization mode for guaranteeing energy safety in China. Carbon dioxide emission of coal-fired power generation is reduced, on one hand, the carbon dioxide emission is reduced by improving the power generation efficiency of a power station and reducing coal consumption, and on the other hand, research and development and large-scale application of a carbon capture technology need to be accelerated.
As the energy consumption of the carbon capturing process is large, the economical efficiency of the power plant is deteriorated for the existing coal-fired power plant. In order to ensure the economical efficiency of a power plant with a carbon capture device, on one hand, the cost of the carbon capture process needs to be greatly reduced through technology or operation means, and on the other hand, the complementarity of the carbon capture process and the power generation process needs to be researched, and the integration benefit of a system is excavated. In recent years, various novel carbon capture technologies and power generation technologies are in the future, and a wide exploration space is provided for developing more advanced carbon capture power generation systems. For example: the supercritical carbon dioxide cycle power generation is a novel high-efficiency power generation method and can be used for high-efficiency coal-fired power generation; the carbon dioxide desublimation carbon capture method is considered to be lower in energy consumption than other carbon capture methods. However, at present, the integration of these new methods is considered less by the skilled person.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to improve the economy of the coal-fired power plant with the carbon capturing device and realize the high-efficiency low-carbon emission and even zero-carbon emission utilization of coal.
In order to solve the technical problem, the technical scheme of the utility model is to provide a coal-fired power generation system with a carbon capturing device, which comprises a supercritical carbon dioxide circulation subsystem and a carbon capturing subsystem;
the supercritical carbon dioxide circulation subsystem comprises a carbon dioxide compressor, wherein the outlet of the carbon dioxide compressor is connected with a high-pressure carbon dioxide inlet of a carbon dioxide heat regenerator, the high-pressure carbon dioxide outlet of the carbon dioxide heat regenerator is connected with the high-pressure carbon dioxide inlet of a coal-fired boiler, the high-pressure carbon dioxide outlet of the coal-fired boiler is connected with a high-pressure turbine inlet, a first exhaust gas outlet of a high-pressure turbine is connected with a high-pressure turbine exhaust gas inlet of the carbon dioxide heat regenerator, the high-pressure turbine exhaust gas outlet of the carbon dioxide heat regenerator is connected with the inlet of a precooler, the outlet of the precooler; the circuit constitutes a low pressure ratio supercritical carbon dioxide circuit.
The outlet of the high-pressure carbon dioxide pump is connected with the high-pressure carbon dioxide inlet of a cooler, the high-pressure carbon dioxide outlet of the cooler is connected with the high-pressure carbon dioxide inlet of a carbon dioxide regenerator, the high-pressure carbon dioxide outlet of the carbon dioxide regenerator is connected with the high-pressure carbon dioxide inlet of a coal-fired boiler, the high-pressure carbon dioxide outlet of the coal-fired boiler is connected with the high-pressure turbine inlet of the coal-fired boiler, the second exhaust gas outlet of a high-pressure turbine is connected with the low-pressure carbon dioxide inlet of the coal-fired boiler, the low-pressure carbon dioxide outlet of the coal-fired boiler is connected with the low-pressure turbine exhaust gas inlet of the carbon dioxide regenerator; the circuit constitutes a high pressure ratio supercritical carbon dioxide circuit.
The carbon capture subsystem comprises an air liquefying device, a liquefied air outlet of the air liquefying device is connected with an inlet of a liquefied air storage tank, an outlet of the liquefied air storage tank is connected with an inlet of a liquefied air pump, an outlet of the liquefied air pump is connected with an air inlet of a carbon dioxide desublimation separator, an air outlet of the carbon dioxide desublimation separator is connected with an air inlet of a water vapor desublimation separator, an air outlet of the water vapor desublimation separator is connected with an air inlet of a water vapor condensation separator, and an air outlet of the condensation separator is connected with the; this circuit constitutes a liquefied air cooling circuit.
The high-temperature side port of the heat storage device is respectively connected with a heat transfer medium inlet of the carbon dioxide heat regenerator and a heat transfer medium outlet of the air liquefaction device, and the low-temperature side port of the heat storage device is respectively connected with the heat transfer medium outlet of the carbon dioxide heat regenerator and the heat transfer medium inlet of the air liquefaction device; the loop forms a waste heat recovery loop of the air liquefaction device.
The inlet of the flue gas pretreatment device is connected with the flue gas outlet of the coal-fired boiler, the outlet of the flue gas pretreatment device is connected with the flue gas inlet of the water-vapor condensation separator, the flue gas outlet of the water-vapor condensation separator is connected with the flue gas inlet of the carbon dioxide condensation separator, the decarbonization gas outlet of the carbon dioxide condensation separator is connected with the decarbonization gas inlet of the water-vapor condensation separator, the decarbonization gas outlet of the water-vapor condensation separator is; the carbon dioxide desublimation separator dry ice outlet is connected with the inlet of the dry ice conveying device, the outlet of the dry ice conveying device is connected with the inlet of the condenser dry ice, the outlet of the liquid carbon dioxide formed by melting the condenser dry ice is connected with the inlet of the low-pressure carbon dioxide pump, the outlet of the low-pressure carbon dioxide pump is connected with the inlet of the liquid carbon dioxide formed by melting the cooler dry ice, and the outlet of the liquid carbon dioxide formed by melting the cooler dry ice is connected with the inlet of. The loop forms a carbon dioxide desublimation carbon capturing loop.
Preferably, the carbon dioxide regenerator is a multi-flow heat exchanger and is formed by combining more than one heat exchanger in series and/or in parallel.
Preferably, the cooler is a multi-flow heat exchanger, and is formed by combining more than one heat exchanger in series and/or in parallel.
Preferably, the high-pressure turbine and the low-pressure turbine are coaxially connected with a generator, and the high-pressure turbine and the low-pressure turbine push the generator to generate electric energy.
Preferably, the moisture condensation separator is provided with a condensed water discharge port.
Preferably, the water vapor desublimation separator is provided with a deicing device and an ice discharge port.
Preferably, the flue gas pretreatment device is provided with a flue gas desulfurization and dehydration device.
The utility model also provides a coal-fired power generation method of carbon device is caught in area, its characterized in that: the coal-fired power generation system with the carbon capturing device comprises the following steps: coal is combusted in the coal-fired boiler to generate heat, the heat is provided for the supercritical carbon dioxide circulation subsystem to generate power, meanwhile, the coal-fired boiler discharges flue gas rich in carbon dioxide, the flue gas is decarbonized by the carbon capture subsystem, and carbon dioxide capture is completed; meanwhile, the carbon capture subsystem provides redundant heat and cold to the supercritical carbon dioxide circulation subsystem; during the power generation valley, the air liquefying device increases the load and stores liquefied air and waste heat; during peak power generation, the air liquefaction device reduces the load and releases the stored liquefied air and waste heat.
Preferably, the working process of the supercritical carbon dioxide circulation subsystem is as follows:
the carbon dioxide compressor boosts the liquid carbon dioxide working medium, and simultaneously the high-pressure carbon dioxide pump boosts the liquid carbon dioxide working medium to the same pressure, and two carbon dioxide working mediums after boosting converge to enter the carbon dioxide heat regenerator to absorb heat, then enter the coal-fired boiler to heat, then enter the high-pressure turbine to expand and do work, and the high-pressure turbine exhaust is divided into two paths:
one path directly enters a carbon dioxide heat regenerator; the high-pressure turbine exhaust gas is cooled in a precooler after heat is released by a carbon dioxide heat regenerator, then further cooled and condensed into liquid in a cooler, and then enters a carbon dioxide compressor;
the other path returns to the coal-fired boiler to be reheated, then enters a low-pressure turbine to perform expansion work, and then enters a carbon dioxide regenerator; the low-pressure turbine exhaust gas enters a condenser after the heat is released by a carbon dioxide regenerator and exchanges heat with dry ice from a dry ice conveying device to be converted into liquid carbon dioxide, and then the part of the liquid carbon dioxide enters a high-pressure carbon dioxide pump.
Preferably, the working process of the carbon capture subsystem is as follows:
the air liquefaction device liquefies air and stores the air in a liquefied air storage tank, the liquefied air pump conveys the liquefied air in the liquefied air storage tank to the carbon dioxide desublimation separator, and the liquefied air gradually releases cold energy through the carbon dioxide desublimation separator, the water vapor desublimation separator and the water vapor condensation separator in sequence and is finally discharged to the atmospheric environment; the waste heat generated in the compression process in the air liquefaction is stored in the heat storage device through a heat transfer medium, and the part of heat is transferred to a carbon dioxide working medium from a carbon dioxide compressor and a high-pressure carbon dioxide pump through the heat transfer medium through a low-temperature section of a carbon dioxide heat regenerator; the method comprises the following steps that flue gas discharged by a coal-fired boiler is desulfurized by a flue gas pretreatment device and is subjected to partial water removal, then is cooled by a water vapor condensation separator for further dehydration, then is further cooled by a water vapor desublimation separator to be below the desublimation temperature of water, the water in the flue gas is desublimated into ice, then is subjected to deep cooling by a carbon dioxide desublimation separator to be below the desublimation temperature of carbon dioxide, the carbon dioxide in the flue gas is desublimated into dry ice, and the decarburized flue gas releases residual cold from the water vapor desublimation separator and the water vapor condensation separator and is finally discharged to the atmospheric environment;
the dry ice produced by the carbon dioxide desublimation separator is conveyed into the condenser through the dry ice conveying device, the dry ice and the low-pressure turbine exhaust gas are converted into liquid carbon dioxide through heat exchange, then the liquid carbon dioxide enters the low-pressure carbon dioxide pump for pressurization, and then the liquid carbon dioxide is released through the cooler to be residual cold, and finally the residual cold enters the carbon dioxide collecting device for collection.
Preferably, the air liquefaction plant is turned up to produce during the off-peak period of power generation and is turned down during the on-peak period of power generation.
Preferably, the carbon dioxide working medium is pressurized to be more than 20MPa by the carbon dioxide compressor and the high-pressure carbon dioxide circulating pump.
Preferably, the temperature of the high-pressure turbine inlet working medium is more than 600 ℃.
Preferably, the high pressure turbine outlet working medium pressure is not higher than 6 MPa.
Preferably, the low pressure turbine outlet working medium pressure is not higher than 1 MPa.
Preferably, the carbon dioxide pressure at the outlet of the low-pressure carbon dioxide pump is 8-10 MPa.
Preferably, the carbon dioxide collected by the carbon dioxide collection device can be used for industrial purposes, enhanced oil recovery, or sequestration.
Preferably, the heat transfer medium of the heat storage device is water.
Compared with the prior art, the utility model provides a coal-fired power generation system and method of carbon device are caught in area has following beneficial effect:
1. zero carbon dioxide emission of a coal-fired power plant can be realized, the flue gas can be cooled to below-150 ℃ by liquefied air, and the saturated partial pressure of carbon dioxide in the flue gas is lower than 10-5And (MPa), the carbon dioxide content in the flue gas is lower than that in the atmosphere.
2. The waste heat of the air liquefaction process can be recovered and supplied to the supercritical carbon dioxide for circulation and power generation, meanwhile, the cold energy of the liquefied air is transferred to the dry ice and then transferred to the supercritical carbon dioxide for circulation and cold end working medium condensation, the supercritical carbon dioxide circulation power generation efficiency is greatly improved, the two factors are equivalent to the reduction of the net energy consumption of the carbon capture process, and the economical efficiency of a power plant is improved.
3. The air liquefaction process has an energy storage function, so that the power generation system still keeps higher load in the valley of the Internet, and the load regulation capacity of a power plant is increased.
Drawings
FIG. 1 is a schematic view of a coal-fired power generation system with a carbon capture unit according to the present embodiment;
description of reference numerals:
the system comprises a carbon dioxide compressor, a carbon dioxide regenerator, a coal-fired boiler, a high-pressure turbine, a precooler, a high-pressure carbon dioxide pump, a cooler, a low-pressure turbine, a condenser, a generator, an air liquefaction device, a liquefied air storage tank, a liquefied air pump, a carbon dioxide desublimation separator, a water vapor desublimation separator, a steam condensation separator, a smoke pretreatment device, an induced draft fan, a dry ice conveying device, a low-pressure carbon dioxide pump, a carbon dioxide collecting device and a heat storage device, wherein the carbon dioxide compressor, the carbon dioxide reheater, the coal-fired boiler, the high-pressure turbine, the precooler, the high-pressure carbon dioxide pump, the cooler, the low-pressure turbine, the.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Fig. 1 is a schematic diagram of a coal-fired power generation system with a carbon capture device provided in this embodiment, where the coal-fired power generation system with the carbon capture device includes a supercritical carbon dioxide circulation subsystem and a carbon capture subsystem.
The supercritical carbon dioxide circulation subsystem comprises a carbon dioxide compressor 1, a carbon dioxide heat regenerator 2, a coal-fired boiler 3, a high-pressure turbine 4, a precooler 5, a high-pressure carbon dioxide pump 6, a cooler 7, a low-pressure turbine 8, a condenser 9 and a generator 10.
The outlet of the carbon dioxide compressor 1 is connected with the high-pressure carbon dioxide inlet of the carbon dioxide heat regenerator 2, the high-pressure carbon dioxide outlet of the carbon dioxide heat regenerator 2 is connected with the high-pressure carbon dioxide inlet of the coal-fired boiler 3, the high-pressure carbon dioxide outlet of the coal-fired boiler 3 is connected with the inlet of the high-pressure turbine 4, one of the two outlets of the high-pressure turbine 4 is connected with the high-pressure turbine exhaust inlet of the carbon dioxide heat regenerator 2, the high-pressure turbine exhaust outlet of the carbon dioxide heat regenerator 2 is connected with the inlet of the precooler 5, the outlet of the precooler 5 is connected with the high-pressure turbine.
The outlet of the high-pressure carbon dioxide pump 6 is connected with the high-pressure carbon dioxide inlet of the cooler 7, the high-pressure carbon dioxide outlet of the cooler 7 is connected with the high-pressure carbon dioxide inlet of the carbon dioxide heat regenerator 2, the high-pressure carbon dioxide outlet of the carbon dioxide heat regenerator 2 is connected with the high-pressure carbon dioxide inlet of the coal-fired boiler 3, the high-pressure carbon dioxide outlet of the coal-fired boiler 3 is connected with the high-pressure turbine 4, the other outlet of the two outlets of the high-pressure turbine 4 is connected with the low-pressure carbon dioxide inlet of the coal-fired boiler 3, the low-pressure carbon dioxide outlet of the. The high-pressure turbine 4 and the low-pressure turbine 8 are coaxially connected to a generator 10.
The carbon capturing subsystem comprises an air liquefying device 11, a liquefied air storage tank 12, a liquefied air pump 13, a carbon dioxide desublimation separator 14, a water vapor desublimation separator 15, a water vapor condensation separator 16, a flue gas pretreatment device 17, an induced draft fan 18, a dry ice conveying device 19, a low-pressure carbon dioxide pump 20, a carbon dioxide collecting device 21 and a heat storage device 22.
The liquefied air outlet of the air liquefying device 11 is connected with an inlet of a liquefied air storage tank 12, an outlet of the liquefied air storage tank 12 is connected with an inlet of a liquefied air pump 13, an outlet of the liquefied air pump 13 is connected with an air inlet of a carbon dioxide desublimation separator 14, an air outlet of the carbon dioxide desublimation separator 14 is connected with an air inlet of a water vapor desublimation separator 15, an air outlet of the water vapor desublimation separator 15 is connected with an air inlet of a water vapor condensation separator 16, and an air outlet of the condensation separator 16 is connected with the atmosphere environment.
The high-temperature side port of the heat storage device 22 is respectively connected with the heat transfer medium inlet of the carbon dioxide regenerator 2 and the heat transfer medium outlet of the air liquefaction device 11, and the low-temperature side port of the heat storage device 22 is respectively connected with the heat transfer medium outlet of the carbon dioxide regenerator 2 and the heat transfer medium inlet of the air liquefaction device 11.
17 exit linkage 3 exhanst gas outlets of coal fired boiler of flue gas preprocessing device, 17 exit linkage 16 exhanst gas inlets of moisture condensation separator of flue gas preprocessing device, 16 exhanst gas outlets of moisture condensation separator connect 15 exhanst gas inlets of moisture desublimation separator, 15 exhanst gas outlets of moisture desublimation separator connect 14 exhanst gas inlets of carbon dioxide desublimation separator, 15 decarbonization gas inlets of carbon dioxide desublimation separator of carbon dioxide desublimation gas outlets connection moisture desublimation separator, 16 decarbonization gas outlets of moisture desublimation separator connect the import of draught fan 18, 18 exit linkage atmospheric environment of draught fan. The carbon dioxide desublimation separator 14 dry ice outlet is connected with the inlet of a dry ice conveying device 19, the outlet of the dry ice conveying device 19 is connected with the inlet of a condenser 9 dry ice, the outlet of liquid carbon dioxide formed by melting the dry ice of the condenser 9 is connected with the inlet of a low-pressure carbon dioxide pump 20, the outlet of the low-pressure carbon dioxide pump 20 is connected with the inlet of liquid carbon dioxide formed by melting the dry ice of the cooler 7, and the outlet of liquid carbon dioxide formed by melting the dry ice of the cooler 7 is connected with.
The devices in the loops are connected through pipelines, and valves, fluid machines and meters can be arranged on the pipelines according to the operation and control requirements of the system. Other parts of the system comprise auxiliary facilities, electrical systems, instrument control systems and the like, and facilities for meeting safety requirements.
The specific working process of the coal-fired power generation system with the carbon capturing device provided by the embodiment when in use is as follows:
the carbon dioxide compressor 1 raises the liquid carbon dioxide working medium to a high pressure of 30MPa, and the high-pressure carbon dioxide pump 6 raises the liquid carbon dioxide working medium to the same high pressure. Two carbon dioxide working media are converged and enter a carbon dioxide heat regenerator 2 to absorb heat, then enter a coal-fired boiler 3 to be heated to 620 ℃, the high-temperature and high-pressure carbon dioxide working media enter a high-pressure turbine 4 to be expanded to do work, and the pressure is reduced to 6 MPa. The high-pressure turbine 4 exhaust is divided into two paths:
one path directly enters a carbon dioxide heat regenerator 2; the exhaust gas of the high-pressure turbine 4 is released heat by the carbon dioxide heat regenerator 2, enters the precooler 5 for cooling, enters the cooler 7 for further cooling and condensing into liquid, and then enters the carbon dioxide compressor 1;
the other path returns to the coal-fired boiler 3 to be reheated to 620 ℃, then enters a low-pressure turbine 8 to be expanded to apply work, the pressure is reduced to 1MPa, and then enters a carbon dioxide regenerator 2. The exhaust gas of the low-pressure turbine 8 releases heat through the carbon dioxide regenerator 2 and then enters the condenser 9 to exchange heat with dry ice from a dry ice conveying device 19 to be converted into liquid carbon dioxide, and then the part of the liquid carbon dioxide enters the high-pressure carbon dioxide pump 6.
The high pressure turbine 4 and the low pressure turbine 8 drive the generator 10 to generate electric power.
The air liquefaction device 11 is stored in the liquefied air storage tank 12 after liquefying the air, the liquefied air pump 13 is carried to the carbon dioxide desublimation separator 14 with the liquefied air in the liquefied air storage tank 12, and the liquefied air releases cold volume step by step through the carbon dioxide desublimation separator 14, the steam desublimation separator 15, the steam condensation separator 16 in proper order, discharges to atmospheric environment at last. The waste heat generated in the compression process in the air liquefaction is stored in the heat storage device 22 through the heat transfer medium, and the part of heat is transferred to the carbon dioxide working medium from the carbon dioxide compressor 1 and the high-pressure carbon dioxide pump 6 through the heat transfer medium through the low-temperature section of the carbon dioxide heat regenerator 2. The flue gas discharged from the coal-fired boiler 3 is firstly desulfurized by a flue gas pretreatment device 17 and is subjected to partial water removal, then is cooled by a water vapor condensation separator 16 for further dehydration, and then is further cooled by a water vapor desublimation separator 15 to below the desublimation temperature of water, the water in the flue gas is desublimated into ice, and then is subjected to deep cooling by a carbon dioxide desublimation separator 14 to below the desublimation temperature of carbon dioxide, the carbon dioxide in the flue gas is desublimated into dry ice, and the residual cold is released from the water vapor desublimation separator 15 and the water vapor condensation separator 16 by the decarbonized flue gas and finally discharged to the atmospheric environment.
Dry ice produced by the carbon dioxide desublimation separator 14 is conveyed into the condenser 9 through a dry ice conveying device 19, the dry ice and the exhaust gas of the low-pressure turbine 8 are converted into liquid carbon dioxide through heat exchange, then the liquid carbon dioxide enters a low-pressure carbon dioxide pump 20 and is pressurized to 9MPa, residual cold is released through the cooler 7, and finally the liquid carbon dioxide enters a carbon dioxide collecting device 21 to be collected. The air liquefaction device 11 adjusts the output to be high during the off-peak period of power generation and adjusts the output to be low during the peak period of power generation.
According to the operation method, the coal-fired power generation system with the carbon capturing device can realize zero carbon emission, and when a high-efficiency turbine machine and a heat exchanger are adopted, the efficiency of a conventional coal-fired power generation system is expected to be achieved.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the method of the present invention, and such modifications and additions are also considered to be within the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a coal fired power generation system of carbon capturing device which characterized in that: comprises a supercritical carbon dioxide circulation subsystem and a carbon capture subsystem;
the supercritical carbon dioxide circulation subsystem comprises a carbon dioxide compressor (1), wherein the outlet of the carbon dioxide compressor (1) is connected with a high-pressure carbon dioxide inlet of a carbon dioxide regenerator (2), the high-pressure carbon dioxide outlet of the carbon dioxide regenerator (2) is connected with a high-pressure carbon dioxide inlet of a coal-fired boiler (3), the high-pressure carbon dioxide outlet of the coal-fired boiler (3) is connected with the inlet of a high-pressure turbine (4), a first exhaust gas outlet of the high-pressure turbine (4) is connected with a high-pressure turbine exhaust gas inlet of the carbon dioxide regenerator (2), a high-pressure turbine exhaust gas outlet of the carbon dioxide regenerator (2) is connected with the inlet of a precooler (5), the outlet of the precooler (5) is connected with a high-pressure turbine exhaust gas inlet of a cooler (7;
the outlet of the high-pressure carbon dioxide pump (6) is connected with the high-pressure carbon dioxide inlet of the cooler (7), the high-pressure carbon dioxide outlet of the cooler (7) is connected with the high-pressure carbon dioxide inlet of the carbon dioxide regenerator (2), the second exhaust gas outlet of the high-pressure turbine (4) is connected with the low-pressure carbon dioxide inlet of the coal-fired boiler (3), the low-pressure carbon dioxide outlet of the coal-fired boiler (3) is connected with the inlet of the low-pressure turbine (8), the outlet of the low-pressure turbine (8) is connected with the low-pressure exhaust gas inlet of the carbon dioxide regenerator (2), the low-pressure exhaust gas outlet of the carbon dioxide regenerator (2) is connected with the low-pressure exhaust gas inlet of the condenser (9), and;
the carbon capturing subsystem comprises an air liquefying device (11), a liquefied air outlet of the air liquefying device (11) is connected with an inlet of a liquefied air storage tank (12), an outlet of the liquefied air storage tank (12) is connected with an inlet of a liquefied air pump (13), an outlet of the liquefied air pump (13) is connected with an air inlet of a carbon dioxide desublimation separator (14), an air outlet of the carbon dioxide desublimation separator (14) is connected with an air inlet of a water vapor desublimation separator (15), an air outlet of the water vapor desublimation separator (15) is connected with an air inlet of a water vapor condensation separator (16), and an air outlet of the condensation separator (16) is connected with an atmospheric environment;
the high-temperature side port of the heat storage device (22) is respectively connected with a heat transfer medium inlet of the carbon dioxide regenerator (2) and a heat transfer medium outlet of the air liquefaction device (11), and the low-temperature side port of the heat storage device (22) is respectively connected with the heat transfer medium outlet of the carbon dioxide regenerator (2) and the heat transfer medium inlet of the air liquefaction device (11);
the inlet of the flue gas pretreatment device (17) is connected with the flue gas outlet of the coal-fired boiler (3), the outlet of the flue gas pretreatment device (17) is connected with the flue gas inlet of the water vapor condensation separator (16), the flue gas outlet of the water vapor condensation separator (16) is connected with the flue gas inlet of the water vapor desublimation separator (15), the flue gas outlet of the water vapor desublimation separator (15) is connected with the flue gas inlet of the carbon dioxide desublimation separator (14), the decarbonization gas outlet of the carbon dioxide desublimation separator (14) is connected with the decarbonization gas inlet of the water vapor desublimation separator (15), the decarbonization gas outlet of the water vapor desublimation separator (15) is connected with the decarbonization device inlet of the water vapor condensation separator (16), the decarbonization gas outlet of the water vapor condensation separator (16) is connected with the inlet of a; a carbon dioxide desublimation separator (14) dry ice outlet is connected with an inlet of a dry ice conveying device (19), an outlet of the dry ice conveying device (19) is connected with a dry ice inlet of a condenser (9), a liquid carbon dioxide outlet formed by melting the dry ice of the condenser (9) is connected with an inlet of a low-pressure carbon dioxide pump (20), an outlet of the low-pressure carbon dioxide pump (20) is connected with a liquid carbon dioxide inlet formed by melting the dry ice of a cooler (7), and a liquid carbon dioxide outlet formed by melting the dry ice of the cooler (7) is connected with an inlet of a carbon dioxide collecting device (21).
2. A coal-fired power generation system with a carbon capture plant as defined in claim 1, wherein: the carbon dioxide heat regenerator (2) is a multi-flow heat exchanger and is formed by combining more than one heat exchanger in series and/or in parallel.
3. A coal-fired power generation system with a carbon capture plant as defined in claim 1, wherein: the cooler (7) is a multi-flow heat exchanger and is formed by combining more than one heat exchanger in series and/or in parallel.
4. A coal-fired power generation system with a carbon capture plant as defined in claim 1, wherein: the high-pressure turbine (4) and the low-pressure turbine (8) are coaxially connected with the generator (10).
5. A coal-fired power generation system with a carbon capture plant as defined in claim 1, wherein: the water-vapor condensation separator (16) is provided with a condensed water discharge port.
6. A coal-fired power generation system with a carbon capture plant as defined in claim 1, wherein: the water vapor desublimation separator (15) is provided with a deicing device and an ice discharging port.
7. A coal-fired power generation system with a carbon capture plant as defined in claim 1, wherein: the flue gas pretreatment device (17) is provided with a flue gas desulfurization and dehydration device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110159370A (en) * | 2019-05-15 | 2019-08-23 | 上海发电设备成套设计研究院有限责任公司 | A kind of coal generating system and method with carbon capture device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159370A (en) * | 2019-05-15 | 2019-08-23 | 上海发电设备成套设计研究院有限责任公司 | A kind of coal generating system and method with carbon capture device |
| CN110159370B (en) * | 2019-05-15 | 2023-12-26 | 上海发电设备成套设计研究院有限责任公司 | Coal-fired power generation system with carbon capturing device and method |
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