CN109854321B - Pure oxygen combustion supercritical carbon dioxide circulating power generation system and method - Google Patents
Pure oxygen combustion supercritical carbon dioxide circulating power generation system and method Download PDFInfo
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- CN109854321B CN109854321B CN201910183228.1A CN201910183228A CN109854321B CN 109854321 B CN109854321 B CN 109854321B CN 201910183228 A CN201910183228 A CN 201910183228A CN 109854321 B CN109854321 B CN 109854321B
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- carbon dioxide
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- pure oxygen
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- oxygen combustion
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 84
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 84
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 64
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000010248 power generation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004449 solid propellant Substances 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- 238000003889 chemical engineering Methods 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 abstract description 3
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 abstract description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
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Abstract
The invention provides a pure oxygen combustion supercritical carbon dioxide circulating power generation system and a method, comprising the following steps: carbon dioxide pump, intercooler, regenerator, turbine, generator, preheater, pure oxygen combustion boiler, dust remover, cooler, water separator, condenser, noncondensable gas separator, fuel feeding device, oxygen feeding device etc.. The combustion chamber is arranged at the downstream of the turbine exhaust port, generated heat is transferred to the mixed gas of turbine exhaust working medium and combustion product gas, the heat is transferred to turbine air inlet through the heat regenerator, carbon dioxide, water and non-condensable gas are separated and treated after the mixed gas is cooled, and redundant carbon dioxide generated by combustion is directly captured. The system has high energy utilization rate, the combustion heat of the pure oxygen combustion boiler is fully utilized, and the power generation efficiency of the circulating system is high; the system has no chimney, can capture carbon dioxide by 100%, and conveniently treat the discharged nitrogen oxides and sulfur oxide polluted gas.
Description
Technical Field
The invention relates to a pure oxygen combustion supercritical carbon dioxide circulating power generation system, and belongs to the technical field of power circulation.
Background
Supercritical carbon dioxide power cycle is a current research hot spot, and has high cycle efficiency, wide application and good application prospect. Supercritical carbon dioxide power cycles can be divided into two categories: the supercritical carbon dioxide is directly heated to high temperature by fuel gas in a combustor in a direct combustion heating mode, and combustion products are discharged or collected in a treatment process after a turbine outlet; the other type adopts an indirect heating mode, supercritical carbon dioxide is heated to high temperature by a main heater, and the main heater can provide heat by various modes such as fuel combustion, concentrated solar heat, nuclear energy and the like. Because the direct combustion heating can obtain high initial parameters, and the methods of back heating, compression near a critical point, power consumption reduction and the like adopted by the supercritical carbon dioxide circulation are added, the direct combustion heating circulation has heat efficiency far higher than that of the indirect heating circulation, and carbon can be directly captured. However, the supercritical carbon dioxide cycle of direct combustion heating is not suitable for coal or other solid fuels, and the main problem is that solid particles generated by combustion can enter the turbine, and the turbine can be disabled.
How to fully utilize the carbon capturing advantage of the pure oxygen combustion of the fuel under the carbon dioxide atmosphere and the efficiency advantage of the supercritical carbon dioxide circulation and avoid the damage of solid particles to the turbine is a problem which is solved by the technicians in the field.
Disclosure of Invention
The invention aims to solve the technical problems that: how to fully develop the carbon capturing advantage of direct heating of pure oxygen combustion and the efficiency advantage of supercritical carbon dioxide circulation, and construct a novel efficient pure oxygen combustion supercritical carbon dioxide circulation power generation system.
In order to achieve the above purpose, the technical scheme of the invention is to provide a pure oxygen combustion supercritical carbon dioxide circulating power generation system, which is characterized by comprising the following components: the device comprises a first carbon dioxide pump, an intercooler inlet connected with an outlet of the first carbon dioxide pump, a second carbon dioxide pump inlet connected with an outlet of the intercooler, a low-temperature side inlet connected with a low-temperature side inlet of the low-temperature heat regenerator, a low-temperature side outlet connected with a high-temperature side inlet of the low-temperature heat regenerator, a low-temperature side outlet connected with a turbine inlet connected with a generator, a turbine outlet connected with a low-temperature side inlet of the preheater, a low-temperature side outlet connected with a pure oxygen combustion boiler working medium inlet, a fuel supply device and an oxygen supply device respectively connected with a pure oxygen combustion boiler fuel inlet and an oxygen inlet, a pure oxygen combustion boiler working medium outlet connected with a dust remover inlet, a dust remover outlet connected with a high-temperature side inlet of the high-temperature heat regenerator, a high-temperature side outlet connected with a high-temperature side inlet of the low-temperature heat regenerator, a high-temperature side outlet connected with a cooler inlet connected with a water separator inlet connected with a condenser inlet connected with a non-condensable gas separator outlet connected with the first carbon dioxide pump inlet.
Preferably, the fuel supply provides coal or other solid fuel.
The invention also provides a pure oxygen combustion supercritical carbon dioxide cyclic power generation method, which adopts the pure oxygen combustion supercritical carbon dioxide cyclic power generation system and comprises the following steps: after being pressurized by a first carbon dioxide pump, the liquid carbon dioxide working medium is cooled by an intercooler, enters a second carbon dioxide pump to be further pressurized, absorbs heat by a low-temperature heat regenerator and a high-temperature heat regenerator, then enters a turbine to expand and apply work to drive a generator to generate electric power, turbine exhaust enters the preheater to be heated, then enters a pure oxygen combustion boiler to be heated by fuel and oxygen combustion, the formed mixed working medium enters a dust remover to be dedusted, then sequentially enters the high-temperature heat regenerator, the preheater and the low-temperature heat regenerator to release heat, then enters a water separator to be dehumidified by a cooler, then enters a condenser to condense carbon dioxide into liquid, then the noncondensable gas is discharged to a treatment link by a noncondensable gas separator, and the liquid carbon dioxide returns to the first carbon dioxide pump.
Preferably, in the treatment link, the excess carbon dioxide generated by combustion is discharged and collected.
Preferably, the pump outlet pressure of the first carbon dioxide circulating pump is 15-25 MPa.
Preferably, the pump outlet pressure of the second carbon dioxide circulating pump is 25-40 MPa.
Preferably, the turbine inlet air temperature is 600-850 ℃.
Preferably, the turbine has an exhaust pressure of 8MPa or less.
Preferably, the power generation capacity of the pure oxygen combustion supercritical carbon dioxide cycle power generation system is 50 MWe-1000 MWe.
Preferably, the non-condensable gases discharged from the non-condensable gas separator, such as: the nitrogen oxides and the sulfur oxides can be used for chemical engineering after separation.
Preferably, the water discharged from the water separator is treated to obtain high-purity sulfuric acid.
Compared with the prior art, the pure oxygen combustion supercritical carbon dioxide circulating power generation system provided by the invention has the following beneficial effects: the system has high energy utilization rate, the combustion heat of the pure oxygen combustion boiler is fully utilized, and the power generation efficiency of the circulating system is high; the system has no chimney, can capture carbon dioxide by 100%, and conveniently treat the discharged nitrogen oxides and sulfur oxide polluted gas.
Drawings
FIG. 1 is a schematic diagram of a pure oxygen combustion supercritical carbon dioxide cycle power generation system provided in this embodiment;
reference numerals illustrate:
1-a first carbon dioxide pump, 2-an intercooler, 3-a second carbon dioxide pump, 4-a low temperature regenerator, 5-a high temperature regenerator, 6-a turbine, 7-a generator, 8-a preheater, 9-a pure oxygen combustion boiler, 10-a dust remover, 11-a cooler, 12-a water separator, 13-a condenser, 14-a noncondensable gas separator, 15-a fuel supply device and 16-an oxygen supply device.
Detailed Description
The invention will be further illustrated with reference to specific examples.
In order to fully utilize the carbon capturing advantage of pure oxygen combustion of fuel under the carbon dioxide atmosphere and the efficiency advantage of supercritical carbon dioxide circulation and avoid damage to a turbine by solid particles, the embodiment arranges a combustion chamber at the downstream of an exhaust port of the turbine, the generated heat is transferred to the mixed gas of turbine exhaust working medium and combustion product gas, the heat is transferred to turbine air inlet through a heat regenerator, carbon dioxide, water and non-condensable gas are separated and treated after the mixed gas is cooled, and redundant carbon dioxide generated by combustion is directly captured.
Fig. 1 is a schematic diagram of a pure oxygen combustion supercritical carbon dioxide circulation power generation system provided in this embodiment, the pure oxygen combustion supercritical carbon dioxide circulation power generation system includes a first carbon dioxide pump 1, an outlet of the first carbon dioxide pump 1 is connected with an inlet of an intercooler 2, an outlet of the intercooler 2 is connected with an inlet of a second carbon dioxide pump 3, an outlet of the second carbon dioxide pump 3 is connected with a low-temperature side inlet of a low-temperature regenerator 4, a low-temperature side outlet of the low-temperature regenerator 4 is connected with a low-temperature side inlet of a high-temperature regenerator 5, a low-temperature side outlet of the high-temperature regenerator 5 is connected with an inlet of a turbine 6, the turbine 6 is connected with a generator 7, an outlet of the turbine 6 is connected with a low-temperature side inlet of a preheater 8, a low-temperature side outlet of the preheater 8 is connected with a working medium inlet of a pure oxygen combustion boiler 9 provided with a slag discharge port, the outlets of the fuel supply device 15 and the oxygen supply device 16 are respectively connected with a fuel inlet and an oxygen inlet of the pure oxygen combustion boiler 9, a working medium outlet of the pure oxygen combustion boiler 9 is connected with an inlet of a dust remover 10 provided with an ash discharge port, an outlet of the dust remover 10 is connected with a high-temperature side inlet of the high-temperature heat regenerator 5, a high-temperature side outlet of the high-temperature heat regenerator 5 is connected with a high-temperature side inlet of the preheater 8, a high-temperature side outlet of the preheater 8 is connected with a high-temperature side inlet of the low-temperature heat regenerator 4, a high-temperature side outlet of the low-temperature heat regenerator 4 is connected with an inlet of the cooler 11, an outlet of the cooler 11 is connected with an inlet of a water separator 12 provided with a water outlet, an outlet of the water separator 12 is connected with an inlet of the condenser 13, an outlet of the condenser 13 is connected with an inlet of a non-condensable gas separator 14 provided with an exhaust port, and an outlet of the non-condensable gas separator 14 is connected with an inlet of the first carbon dioxide pump 1.
All the devices in the circulating system are connected through pipelines, valves and meters can be arranged on the pipelines according to the control requirement of the system, and other parts forming the system are auxiliary facilities, an electrical system, a control system and the like.
The specific implementation steps of the pure oxygen combustion supercritical carbon dioxide cycle power generation system provided by the embodiment are as follows:
the liquid carbon dioxide working medium is pressurized to 15MPa by a first carbon dioxide pump 1, cooled by an intercooler 2, then enters a second carbon dioxide pump 3 to be further pressurized to 30MPa, absorbs heat to 750 ℃ by a low-temperature heat regenerator 4 and a high-temperature heat regenerator 5, enters a turbine 6 to be expanded to about 6MPa, the turbine 6 does work to push a generator 7 to generate power, the turbine 6 exhaust gas enters a preheater 8 to be heated, then enters a pure oxygen combustion boiler 9 to be heated by fuel and oxygen combustion, the formed high-temperature mixed working medium enters a dust remover 10 to remove dust, then enters the high-temperature heat regenerator 5, the preheater 8 and the low-temperature heat regenerator 4 to release heat, then is cooled by a cooler 11, enters a water separator 12 to dehumidify, then enters a condenser 13 to condense carbon dioxide into a liquid state (about 20 ℃), then discharges noncondensable gas to a treatment link by a noncondensable gas separator 14, and the residual carbon dioxide generated by combustion is discharged and collected, and the residual carbon dioxide returns to the first carbon dioxide pump 1.
According to the embodiment, the medium-capacity and high-capacity class units with 50-1000 MWe can be formed, the net efficiency of power generation can reach more than 50% after oxygen supply devices (such as air separation equipment) and other plant power are subtracted, and the device has the advantages of carbon capture of 100%, no pollutant emission and quite good environmental benefit.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A pure oxygen combustion supercritical carbon dioxide circulating power generation system is characterized in that: comprises a first carbon dioxide pump (1), an outlet of the first carbon dioxide pump (1) is connected with an inlet of an intercooler (2), an outlet of the intercooler (2) is connected with an inlet of a second carbon dioxide pump (3), an outlet of the second carbon dioxide pump (3) is connected with a low-temperature side inlet of a low-temperature heat regenerator (4), an outlet of the low-temperature side of the low-temperature heat regenerator (4) is connected with an inlet of a low-temperature side of a high-temperature heat regenerator (5), an outlet of the low-temperature side of the high-temperature heat regenerator (5) is connected with an inlet of a turbine (6), the turbine (6) is connected with an inlet of a generator (7), an outlet of the turbine (6) is connected with an inlet of a low-temperature side of a preheater (8), an outlet of the low-temperature side of the preheater (8) is connected with a working medium inlet of a pure oxygen combustion boiler (9), the fuel supply device (15) and the oxygen supply device (16) are respectively connected with a fuel inlet and an oxygen inlet of the pure oxygen combustion boiler (9), a working medium outlet of the pure oxygen combustion boiler (9) is connected with an inlet of the dust remover (10), an outlet of the dust remover (10) is connected with a high-temperature side inlet of the high-temperature heat regenerator (5), a high-temperature side outlet of the high-temperature heat regenerator (5) is connected with a high-temperature side inlet of the preheater (8), a high-temperature side outlet of the preheater (8) is connected with a high-temperature side inlet of the low-temperature heat regenerator (4), a high-temperature side outlet of the low-temperature heat regenerator (4) is connected with an inlet of the cooler (11), an outlet of the cooler (11) is connected with an inlet of the water separator (12), the outlet of the water separator (12) is connected with the inlet of the condenser (13), the outlet of the condenser (13) is connected with the inlet of the non-condensable gas separator (14), and the outlet of the non-condensable gas separator (14) is connected with the inlet of the first carbon dioxide pump (1).
2. A pure oxygen combustion supercritical carbon dioxide cycle power generation system as defined in claim 1, wherein: the fuel supply (16) provides a solid fuel.
3. A pure oxygen combustion supercritical carbon dioxide cycle power generation system as claimed in claim 2, wherein: the solid fuel includes, but is not limited to, coal.
4. A pure oxygen combustion supercritical carbon dioxide cycle power generation method is characterized in that: a pure oxygen combustion supercritical carbon dioxide cycle power generation system as claimed in any one of claims 1 to 3, comprising the steps of: after being pressurized by a first carbon dioxide pump (1), a liquid carbon dioxide working medium is cooled by an intercooler (2), then enters a second carbon dioxide pump (3) for further pressurization, then absorbs heat by a low-temperature heat regenerator (4) and a high-temperature heat regenerator (5), then enters a turbine (6) for expansion work to push a generator (7) to generate electric power, turbine (6) exhaust gas enters a preheater (8) for heating, then enters a pure oxygen combustion boiler (9) for being combusted and heated by fuel and oxygen, the formed mixed working medium enters a dust remover (10) for dedusting, then sequentially enters the high-temperature heat regenerator (5), the preheater (8) and the low-temperature heat regenerator (4) for releasing heat, then enters a water separator (12) for dehumidification, then enters a condenser (13) for condensing carbon dioxide into liquid, then enters a non-condensable gas separator (14) for discharging non-condensable gas to a treatment link, and the liquid carbon dioxide returns to the first carbon dioxide pump (1).
5. The pure oxygen combustion supercritical carbon dioxide cycle power generation method as claimed in claim 4, wherein: in the treatment link, the redundant carbon dioxide generated by combustion is discharged and then collected.
6. The pure oxygen combustion supercritical carbon dioxide cycle power generation method as claimed in claim 4, wherein: the outlet pressure of the first carbon dioxide pump (1) is 15-25 MPa.
7. The pure oxygen combustion supercritical carbon dioxide cycle power generation method as claimed in claim 4, wherein: the outlet pressure of the second carbon dioxide pump (3) is 25-40 MPa.
8. The pure oxygen combustion supercritical carbon dioxide cycle power generation method as claimed in claim 4, wherein: the turbine (6) has an intake temperature of 600-850 ℃ and an exhaust pressure of 8MPa or less.
9. The pure oxygen combustion supercritical carbon dioxide cycle power generation method as claimed in claim 4, wherein: the noncondensable gas discharged from the noncondensable gas separator (14) is used for chemical engineering after being separated.
10. The pure oxygen combustion supercritical carbon dioxide cycle power generation method as claimed in claim 4, wherein: the water discharged from the water separator (12) is treated to obtain sulfuric acid.
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| CN110307089A (en) * | 2019-08-05 | 2019-10-08 | 上海发电设备成套设计研究院有限责任公司 | A kind of biomass direct combustion power generation system and method |
| CN111102026B (en) * | 2019-12-12 | 2023-11-24 | 上海发电设备成套设计研究院有限责任公司 | Cascade supercritical carbon dioxide power circulation system and method |
| CN111525154B (en) * | 2020-04-28 | 2022-03-29 | 上海发电设备成套设计研究院有限责任公司 | Fuel cell and heat engine hybrid power generation system and working method thereof |
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| US9388712B2 (en) * | 2010-10-13 | 2016-07-12 | Southwest Research Institute | Methods and apparatus for an oxy-fuel based power cycle |
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| US4498289A (en) * | 1982-12-27 | 1985-02-12 | Ian Osgerby | Carbon dioxide power cycle |
| CN107340137A (en) * | 2017-07-25 | 2017-11-10 | 杭州华电半山发电有限公司 | A kind of heavy duty gas turbine efficiency of turbine on-line monitoring system devices and methods therefor |
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