CN112922686A - Gas-steam combined cycle composite power generation system integrating solar energy and MCFC - Google Patents
Gas-steam combined cycle composite power generation system integrating solar energy and MCFC Download PDFInfo
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- CN112922686A CN112922686A CN202110081972.8A CN202110081972A CN112922686A CN 112922686 A CN112922686 A CN 112922686A CN 202110081972 A CN202110081972 A CN 202110081972A CN 112922686 A CN112922686 A CN 112922686A
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- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- H01M8/00—Fuel cells; Manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
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- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/14—Fuel cells with fused electrolytes
- H01M2008/147—Fuel cells with molten carbonates
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
本发明公开了一种集成太阳能和MCFC的燃气‑蒸汽联合循环复合发电系统，涉及新能源开发与利用技术领域。所述集成太阳能和MCFC的燃气‑蒸汽联合循环复合发电系统，包括：燃气‑蒸汽联合循环发电系统、塔式太阳能集热系统和MCFC捕集二氧化碳系统；所述燃气‑蒸汽联合循环发电系统、塔式太阳能集热系统和MCFC捕集二氧化碳系统通过共用换热设备相互耦合连接。本发明利用塔式太阳能集热技术，进一步加热燃气轮机排烟，可提高太阳能利用效率和减少化石能源消耗，以及提升余热锅炉进口烟气温度，提高蒸汽循环的发电功率；本发明利用MCFC捕集二氧化碳，减少了发电系统二氧化碳排放量，同时，MCFC在捕集二氧化碳过程中，释放电能，增加了系统发电量。The invention discloses a gas-steam combined cycle composite power generation system integrating solar energy and MCFC, and relates to the technical field of new energy development and utilization. The gas-steam combined cycle combined power generation system integrating solar energy and MCFC includes: a gas-steam combined cycle power generation system, a tower solar heat collection system and an MCFC carbon dioxide capture system; the gas-steam combined cycle power generation system, tower The MCFC solar collector system and the MCFC capture carbon dioxide system are coupled and connected to each other through shared heat exchange equipment. The invention utilizes the tower solar heat collection technology to further heat the exhaust gas of the gas turbine, which can improve the utilization efficiency of solar energy and reduce the consumption of fossil energy, as well as increase the inlet flue gas temperature of the waste heat boiler, and improve the power generation power of the steam cycle; the invention utilizes MCFC to capture carbon dioxide , reducing the carbon dioxide emissions of the power generation system, and at the same time, in the process of capturing carbon dioxide, the MCFC releases electricity and increases the power generation of the system.
Description
Technical Field
The invention relates to the technical field of new energy development and utilization, in particular to a gas-steam combined cycle compound power generation system integrating solar energy and MCFC.
Background
At present, thermal power generation is the main power generation mode in China. The energy source of thermal power generation mainly depends on fossil energy, and excessive use of fossil energy has brought about a plurality of practical problems, such as: energy shortage, greenhouse effect, environmental deterioration and the like. Therefore, the clean energy power generation mode has become a hot topic for discussion and research in all circles of society.
The gas-steam combined cycle has the advantages of short construction period, high operation reliability, high energy conversion efficiency and the like, and becomes one of the main trends of the development of the power industry. However, the main energy source of the gas-steam combined cycle power generation still depends on fossil energy, and the carbon dioxide released by the combustion of the fossil energy still causes environmental problems. Therefore, how to further reduce the use of fossil energy and reduce the emission of carbon dioxide pollutants is a technical problem to be solved in the technical field of new energy development and utilization.
Disclosure of Invention
In view of the above technical problems, embodiments of the present invention provide a gas-steam combined cycle hybrid power generation system integrating solar energy and MCFC to solve the problems in the background art.
The invention provides the following technical scheme: a combined gas-steam cycle hybrid power generation system integrating solar energy and MCFC, comprising: the system comprises a gas-steam combined cycle power generation system, a tower type solar heat collection system and an MCFC carbon dioxide capturing system; the gas-steam combined cycle power generation system, the tower type solar heat collection system and the MCFC carbon dioxide capturing system are mutually coupled and connected through shared heat exchange equipment.
Preferably, the gas-steam combined cycle power generation system includes: the system comprises a gas compressor, an air preheater, a combustion chamber, a gas turbine, a first generator, a flue gas processor, a heat absorber, a waste heat boiler, a high-pressure cylinder of the turbine, a medium-pressure cylinder of the turbine, a low-pressure cylinder of the turbine, a second generator, a condenser, a low-pressure feed pump, a feed water preheater and a heat exchanger; the gas compressor, the gas turbine and the first generator are coaxially connected; the steam turbine high-pressure cylinder, the steam turbine medium-pressure cylinder, the steam turbine low-pressure cylinder and the second generator are coaxially connected;
the waste heat boiler comprises a high-pressure superheater, a reheater, a high-pressure evaporator, a high-pressure steam pocket, a high-pressure economizer, a high-pressure water feeding pump, a low-pressure superheater, a low-pressure evaporator, a low-pressure steam pocket and a low-pressure economizer;
the air compressor, the air preheater, the combustion chamber and the gas turbine are sequentially connected through pipelines;
the gas turbine, the flue gas processor, the heat absorber and the flue gas inlet of the waste heat boiler are sequentially connected through a pipeline;
the outlet of the low-pressure cylinder of the steam turbine is sequentially connected with the condenser, the low-pressure water feed pump, the water feed preheater, the low-pressure economizer, the low-pressure steam drum, the low-pressure evaporator and the low-pressure superheater through pipelines;
the low-pressure economizer, the high-pressure water feeding pump, the high-pressure economizer and the high-pressure steam pocket are sequentially connected through pipelines;
the high-pressure steam pocket is connected with the high-pressure superheater through a high-pressure evaporator by a pipeline, and the high-pressure steam pocket is connected with the high-pressure superheater through a heat exchanger by a pipeline;
the high-pressure superheater, the steam turbine high-pressure cylinder, the reheater, the steam turbine intermediate-pressure cylinder and the steam turbine low-pressure cylinder are sequentially connected through pipelines;
the tower type solar heat collection system comprises: a heliostat field, a solar tower and a heat absorber;
the MCFC carbon dioxide capture system comprises: the system comprises a first mixer, a flue gas preheater, an MCFC, a direct current/alternating current converter, a second mixer, a prereformer, a post-combustion chamber, an air preheater, a heat exchanger, a condenser, a carbon dioxide recovery unit and a feed water preheater;
the flue gas outlet of the waste heat boiler is connected with the MCFC cathode inlet through a first mixer and a flue gas preheater through a pipeline;
and the MCFC cathode outlet, the flue gas preheater and the water supply preheater are sequentially connected through pipelines.
The second mixer, the pre-reformer and the MCFC anode inlet are connected in sequence through pipelines;
the outlet of the MCFC anode is connected with the second mixer through a pipeline;
and the outlet of the MCFC anode is sequentially connected with the carbon dioxide recovery unit through a post-combustion chamber, an air preheater, a heat exchanger, a condenser and a pipeline.
And the output end of the MCFC is connected with a direct current/alternating current converter.
Preferably, the air preheater 2 uses the anode exhaust gas flowing therethrough to transfer its heat to the compressed air in the compressor for preheating the compressed air.
Preferably, the heat exchanger utilizes the MCFC anode exhaust gas flowing through the heat exchanger to transfer the heat of the MCFC anode exhaust gas to the working medium water to evaporate the working medium water, so that the working medium water expands in the high-pressure cylinder of the steam turbine to do work.
Preferably, the feed water preheater transfers heat to the working fluid water by using MCFC cathode exhaust gas flowing therethrough, for preheating the working fluid water.
Preferably, the flue gas preheater uses MCFC cathode exhaust gas flowing therethrough to transfer its heat to the waste heat boiler exhaust gas for preheating the waste heat boiler exhaust gas.
Preferably, the heat absorber is an air type heat absorber.
The gas-steam combined cycle compound power generation system integrating solar energy and MCFC provided by the embodiment of the invention has the following beneficial effects:
1. the tower type solar heat collection technology is utilized to further heat the exhaust smoke of the gas turbine, so that the utilization efficiency of solar energy can be improved, fossil energy consumption can be reduced, the temperature of the inlet flue gas of the waste heat boiler can be increased, and the power generation power of steam circulation can be improved;
2. the carbon dioxide is captured by the MCFC, so that the carbon dioxide emission of the power generation system is reduced, and meanwhile, the MCFC releases electric energy in the process of capturing the carbon dioxide, so that the power generation capacity of the system is increased;
3. the invention can heat the exhaust gas of the gas turbine to a higher temperature by utilizing the air type heat absorber;
4. according to the invention, the condensed water is preheated by utilizing the cathode exhaust of the fuel cell, the water supply temperature at the inlet of the waste heat boiler is increased, the heat load of the low-pressure economizer can be reduced, the fuel consumption of the system is reduced, and the circulation efficiency is improved;
5. the air preheater is arranged, and air is heated by utilizing anode exhaust of the fuel cell, so that the temperature of air at the inlet of the combustion chamber is increased, the average temperature of combustion is increased, the fuel consumption of the combustion chamber is reduced, and the generating capacity of a power generation system of the gas turbine is increased;
6. the invention is provided with the heat exchanger, and the anode exhaust of the fuel cell is utilized to heat the high-pressure feed water, so that the heat load of the waste heat boiler can be reduced, and the fuel consumption of the system is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a combined gas-steam cycle hybrid power generation system integrating solar energy and MCFC according to the present invention;
in the figure: 1. the system comprises a compressor, 2, an air preheater, 3, a combustion chamber, 4, a gas turbine, 5, a first generator, 6, a flue gas processor, 7, a solar tower, 8, a heat absorber, 9, a heliostat field, 10, a high-pressure superheater, 11, a reheater, 12, a high-pressure evaporator, 13, a high-pressure steam pocket, 14, a high-pressure economizer, 15, a high-pressure water supply pump, 16, a low-pressure superheater, 17, a low-pressure evaporator, 18, a low-pressure steam pocket, 19, a low-pressure economizer, 20, a first mixer, 21, a flue gas preheater, 22, MCFC (molten carbonate fuel cell), 23, a DC/AC converter, 24, a second mixer, 25, a pre-reformer, 26, a post-combustion chamber, 27, a heat exchanger, 28, a condenser, 29, a carbon dioxide recovery unit, 30, a turbine high pressure cylinder, 31, a turbine medium pressure cylinder, 32, a turbine low pressure cylinder, 33, a second generator, 34. condenser, 35, low-pressure feed water pump, 36, feed water preheater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural view of a gas-steam combined cycle hybrid power generation system integrating solar energy and MCFC according to the present invention.
In order to further reduce the use of fossil energy and reduce the emission of carbon dioxide pollutants, a gas-steam combined cycle power generation system, a tower type solar heat collection system and an MCFC carbon dioxide capture system are integrated through research to solve the technical problems mentioned in the background technology, and the concept principle of the invention is as follows:
1. by integrating solar energy and gas-steam combined cycle, the integrated system does not use fossil energy for power generation or solar heat energy for power generation, but uses the complementary utilization of the two energy sources, so that the solar energy utilization efficiency can be improved, and the consumption of fossil energy and the emission of pollutants can be reduced;
2. meanwhile, in an MCFC (molten carbonate fuel cell), carbon dioxide and oxygen at the cathode are combined with electrons delivered from an external circuit to generate carbonate ions, and fuel at the anode is reacted with the carbonate ions transferred from the electrolyte membrane to generate carbon dioxide and water; therefore, the cathode of the MCFC enriches carbon dioxide in the fuel gas-steam combined cycle exhaust smoke to the anode through a series of chemical reactions, so that the concentration of the carbon dioxide is improved, and the trapping energy consumption is reduced; secondly, the MCFC working temperature is high, the exhaust temperature is up to 650 ℃, and the system efficiency can be further improved by utilizing the exhaust waste heat;
therefore, the MCFC is used for capturing the carbon dioxide in the flue gas of the gas-steam combined cycle, so that the carbon dioxide emission can be reduced, and the problem of large additional energy consumption of the traditional carbon dioxide capturing technology can be avoided.
Aiming at the technical problems mentioned in the background art, and combining the concept principle of the invention, the embodiment of the invention provides a gas-steam combined cycle compound power generation system integrating solar energy and MCFC, and the specific technical scheme is as follows:
a combined gas-steam cycle hybrid power generation system integrating solar energy and MCFC, comprising: the system comprises a gas-steam combined cycle power generation system, a tower type solar heat collection system and an MCFC carbon dioxide capturing system; the gas-steam combined cycle power generation system, the tower type solar heat collection system and the MCFC carbon dioxide capturing system are mutually coupled and connected through shared heat exchange equipment.
Preferably, the gas-steam combined cycle power generation system includes: the system comprises a compressor 1, an air preheater 2, a combustion chamber 3, a gas turbine 4, a first generator 5, a flue gas processor 6, a heat absorber 8, a waste heat boiler, a turbine high-pressure cylinder 30, a turbine intermediate-pressure cylinder 31, a turbine low-pressure cylinder 32, a second generator 33, a condenser 34, a low-pressure feed water pump 35, a feed water preheater 36 and a heat exchanger 27; the compressor 1, the gas turbine 4 and the first generator 5 are coaxially connected; the turbine high-pressure cylinder 30, the turbine intermediate-pressure cylinder 31, the turbine low-pressure cylinder 32 and the second generator 33 are coaxially connected;
the waste heat boiler comprises a high-pressure superheater 10, a reheater 11, a high-pressure evaporator 12, a high-pressure steam drum 13, a high-pressure economizer 14, a high-pressure water feeding pump 15, a low-pressure superheater 16, a low-pressure evaporator 17, a low-pressure steam drum 18 and a low-pressure economizer 19;
the air compressor 1, the air preheater 2, the combustion chamber 3 and the gas turbine 4 are sequentially connected through pipelines;
the gas turbine 4, the flue gas processor 6, the heat absorber 8 and the flue gas inlet of the waste heat boiler are sequentially connected through a pipeline;
the outlet of the turbine low-pressure cylinder 32 is sequentially connected with the condenser 34, the low-pressure water feed pump 35, the feed water preheater 36, the low-pressure economizer 19, the low-pressure steam drum 18, the low-pressure evaporator 17 and the low-pressure superheater 16 through pipelines and the inlet of the turbine low-pressure cylinder 32;
the low-pressure economizer 19, the high-pressure water feed pump 15, the high-pressure economizer 14 and the high-pressure steam drum 13 are sequentially connected through pipelines;
the high-pressure steam drum 13 is connected with the high-pressure superheater 10 through a high-pressure evaporator 12 by a pipeline, and the high-pressure steam drum 13 is connected with the high-pressure superheater 10 through a heat exchanger 27 by a pipeline;
the high pressure superheater 10, the turbine high pressure cylinder 30, the reheater 11, the turbine intermediate pressure cylinder 31 and the turbine low pressure cylinder 32 are connected in sequence through pipelines.
Wherein: and the flue gas processor 6 is used for removing impurities such as sulfur dioxide in the flue gas of the gas turbine 4.
The tower type solar heat collection system comprises: a heliostat field 9, a solar tower 7 and a heat absorber 8;
wherein the heat absorber 8 is an air type heat absorber; the heliostat field 9 transmits solar energy to the surface of a heat absorber 8 positioned at the top of the solar tower 7, and the flue gas exhausted by the gas turbine 4 absorbs the solar energy through the heat absorber 8, so that the temperature is increased.
The MCFC carbon dioxide capture system comprises: a first mixer 20, a flue gas preheater 21, MCFC22, a dc/ac converter 23, a second mixer 24, a pre-reformer 25, a post combustion chamber 26, an air preheater 2, a heat exchanger 27, a condenser 28, a carbon dioxide recovery unit 29 and a feedwater preheater 36;
the flue gas outlet of the waste heat boiler is connected with the cathode inlet of the MCFC22 through a first mixer 20 and a flue gas preheater 21 by pipelines;
the MCFC22 cathode outlet, the flue gas preheater 21 and the feed water preheater 36 are connected in sequence through pipelines.
The second mixer 24, the pre-reformer 25 and the anode inlet of the MCFC22 are connected in sequence through pipelines;
the outlet of the MCFC22 anode is connected with a second mixer 24 through a pipeline;
the outlet of the MCFC22 anode is connected with a post-combustion chamber 26, an air preheater 2, a heat exchanger 27, a condenser 28 and a carbon dioxide recovery unit 29 in sequence through pipelines.
The output of the MCFC22 is connected to a dc/ac converter 23.
Wherein: a first mixer 20 for mixing air with exhaust fumes of the waste heat boiler; and a second mixer 24 for mixing the fuel with the MCFC22 anode off-gas.
The gas-steam combined cycle power generation system, the tower type solar heat collection system and the MCFC carbon dioxide capture system are coupled and connected with each other through shared heat exchange equipment; in this embodiment, the heat exchange device includes: an air preheater 2, a heat exchanger 27, a feedwater preheater 36 and a flue gas preheater 21.
In the use process, the air preheater 2 has the working medium on one side of the air preheater which is compressed air and the working medium on one side of the air preheater which is MCFC22 anode exhaust gas, and the compressed air is preheated by utilizing the MCFC22 anode exhaust gas; a heat exchanger 27, wherein a working medium at one side is water/steam, a working medium at one side is MCFC22 anode exhaust, and the MCFC22 anode exhaust is used for heating water to evaporate the water; a feed water preheater 36, one side of the working medium is feed water, one side of the working medium is MCFC22 cathode exhaust, and the MCFC22 cathode exhaust is used for preheating the feed water; one side of the flue gas preheater 21 is used for discharging flue gas of the gas turbine, one side of the flue gas preheater is used for discharging flue gas of the MCFC22 cathode, and the MCFC22 cathode is used for discharging flue gas of the gas turbine.
The invention discloses a use method of a gas-steam combined cycle compound power generation system integrating solar energy and MCFC, which comprises the following steps:
1. in a gas-steam combined cycle system, air is compressed in an air compressor 1 and then enters an air preheater 2 to be preheated by MCFC22 anode exhaust, and the preheated air enters a combustion chamber 3; after the fuel is combusted in the combustion chamber 3, the fuel enters the gas turbine 4 to expand and do work to drive the first generator 5 to generate electricity; the flue gas exhausted by the gas turbine 4 enters a heat absorber 8 positioned at the top of a solar tower 7 through a flue gas processor 6, and in the heat absorber 8, the flue gas absorbs solar energy and the temperature is further raised; the flue gas after heat absorption enters a waste heat boiler, and the flue gas sequentially passes through a high-pressure superheater 10, a reheater 11, a high-pressure evaporator 12, a high-pressure steam drum 13, a high-pressure economizer 14, a low-pressure superheater 16, a low-pressure evaporator 17, a low-pressure steam drum 18 and a low-pressure economizer 19 to heat water/steam in each heating surface;
the exhaust steam at the outlet of the turbine low pressure cylinder 32 enters a condenser 34 for condensation to form condensed water; the condensed water enters the low-pressure economizer 19 through a low-pressure water feed pump 35 and a water feed preheater 36; the water supply at the outlet of the low-pressure economizer 19 is divided into two parts, and one part enters a low-pressure cylinder 32 of the steam turbine through a low-pressure steam drum 18, a low-pressure evaporator 17 and a low-pressure superheater 16 to do work through expansion; after being further pressurized by a high-pressure water feed pump 15, one part of the gas enters a high-pressure steam pocket 13 through a high-pressure economizer 14; the water supplied from the outlet of the high-pressure steam drum 13 is divided into two parts, one part enters the high-pressure superheater 10 through the high-pressure evaporator 12, and the other part enters the high-pressure superheater 10 through the heat exchanger 27; superheated steam at the outlet of the high-pressure superheater 10 enters a turbine high-pressure cylinder 30 to expand and do work, then enters a reheater 11 to be reheated, and the reheated steam sequentially enters a turbine intermediate-pressure cylinder 31 and a turbine low-pressure cylinder 32 to expand and do work; the second generator 33 is driven by the turbine high pressure cylinder 30, the turbine intermediate pressure cylinder 31 and the turbine low pressure cylinder 32 to generate electricity;
2. in the tower type solar heat collection system, a heliostat field 9 reflects solar energy to the surface of a heat absorber 8 positioned at the top of a solar tower 7, and smoke flows through the heat absorber 8 to absorb solar heat, so that the temperature is increased;
3. in the MCFC carbon dioxide capturing system, flue gas from a waste heat boiler and air are mixed in a first mixer 20 and then enter a flue gas preheater 21 to be preheated by MCFC22 cathode exhaust gas; the preheated flue gas enters a cathode of the MCFC22, carbon dioxide in the flue gas is subjected to electrochemical reaction in the cathode of the MCFC22 to form carbonate ions, and the generated carbonate ions enter an anode of the MCFC 22; the reacted flue gas is discharged from the cathode outlet of the MCFC22 and passes through the flue gas preheater 21 and the water supply preheater 36 in sequence to release waste heat;
the fuel is mixed with a part of the MCFC22 anode exhaust gas in the second mixer 24, then enters the pre-reformer 25 and the MCFC22 anode in sequence, and reacts with carbonate ions to generate carbon dioxide and water at the MCFC22 anode through electrochemical reaction; the anode exhaust of the MCFC22 is divided into two parts, one part enters the second mixer 24 to be mixed with fuel, and the other part enters the post-combustion chamber 26 to be burned with pure oxygen, consuming unreacted fuel; the exhaust gas of the post-combustion chamber 26 passes through the air preheater 2 and the heat exchanger 27 in sequence to release waste heat; the discharged hot exhaust gas enters a condenser 28 for condensation, water is separated to obtain high-purity carbon dioxide gas, and the high-purity carbon dioxide gas finally enters a carbon dioxide recovery unit 29 for recovery; the dc/ac converter 23 is connected to the MCFC22 and outputs electric power.
The gas-steam combined cycle compound power generation system integrating solar energy and MCFC provided by the embodiment of the invention has the following beneficial effects: the tower type solar heat collection technology is utilized to further heat the exhaust smoke of the gas turbine, so that the utilization efficiency of solar energy can be improved, fossil energy consumption can be reduced, the temperature of the inlet flue gas of the waste heat boiler can be increased, and the power generation power of steam circulation can be improved; the carbon dioxide is captured by the MCFC, so that the carbon dioxide emission of the power generation system is reduced, and meanwhile, the MCFC releases electric energy in the process of capturing the carbon dioxide, so that the power generation capacity of the system is increased; the invention can heat the exhaust gas of the gas turbine to a higher temperature by utilizing the air type heat absorber; according to the invention, the condensed water is preheated by utilizing the cathode exhaust of the fuel cell, the water supply temperature at the inlet of the waste heat boiler is increased, the heat load of the low-pressure economizer can be reduced, the fuel consumption of the system is reduced, and the circulation efficiency is improved; the air preheater is arranged, and air is heated by utilizing anode exhaust of the fuel cell, so that the temperature of air at the inlet of the combustion chamber is increased, the average temperature of combustion is increased, the fuel consumption of the combustion chamber is reduced, and the generating capacity of a power generation system of the gas turbine is increased; the invention is provided with the heat exchanger, and the anode exhaust of the fuel cell is utilized to heat the high-pressure feed water, so that the heat load of the waste heat boiler can be reduced, and the fuel consumption of the system is reduced.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
It should be understood that the technical solutions and concepts of the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (7)
1. A combined gas-steam cycle hybrid power generation system integrating solar power and MCFC, comprising: the system comprises a gas-steam combined cycle power generation system, a tower type solar heat collection system and an MCFC carbon dioxide capturing system; the gas-steam combined cycle power generation system, the tower type solar heat collection system and the MCFC carbon dioxide capturing system are mutually coupled and connected through shared heat exchange equipment.
2. The combined gas-steam cycle hybrid power system integrating solar power and MCFC according to claim 1,
the gas-steam combined cycle power generation system includes: the system comprises a gas compressor, an air preheater, a combustion chamber, a gas turbine, a first generator, a flue gas processor, a heat absorber, a waste heat boiler, a high-pressure cylinder of the turbine, a medium-pressure cylinder of the turbine, a low-pressure cylinder of the turbine, a second generator, a condenser, a low-pressure feed pump, a feed water preheater and a heat exchanger; the gas compressor, the gas turbine and the first generator are coaxially connected; the steam turbine high-pressure cylinder, the steam turbine medium-pressure cylinder, the steam turbine low-pressure cylinder and the second generator are coaxially connected;
the waste heat boiler comprises a high-pressure superheater, a reheater, a high-pressure evaporator, a high-pressure steam pocket, a high-pressure economizer, a high-pressure water feeding pump, a low-pressure superheater, a low-pressure evaporator, a low-pressure steam pocket and a low-pressure economizer;
the air compressor, the air preheater, the combustion chamber and the gas turbine are sequentially connected through pipelines;
the gas turbine, the flue gas processor, the heat absorber and the flue gas inlet of the waste heat boiler are sequentially connected through a pipeline;
the outlet of the low-pressure cylinder of the steam turbine is sequentially connected with the condenser, the low-pressure water feed pump, the water feed preheater, the low-pressure economizer, the low-pressure steam drum, the low-pressure evaporator and the low-pressure superheater through pipelines;
the low-pressure economizer, the high-pressure water feeding pump, the high-pressure economizer and the high-pressure steam pocket are sequentially connected through pipelines;
the high-pressure steam pocket is connected with the high-pressure superheater through a high-pressure evaporator by a pipeline, and the high-pressure steam pocket is connected with the high-pressure superheater through a heat exchanger by a pipeline;
the high-pressure superheater, the steam turbine high-pressure cylinder, the reheater, the steam turbine intermediate-pressure cylinder and the steam turbine low-pressure cylinder are sequentially connected through pipelines;
the tower type solar heat collection system comprises: a heliostat field, a solar tower and a heat absorber;
the MCFC carbon dioxide capture system comprises: the system comprises a first mixer, a flue gas preheater, an MCFC, a direct current/alternating current converter, a second mixer, a prereformer, a post-combustion chamber, an air preheater, a heat exchanger, a condenser, a carbon dioxide recovery unit and a feed water preheater;
the flue gas outlet of the waste heat boiler is connected with the MCFC cathode inlet through a first mixer and a flue gas preheater through a pipeline;
the MCFC cathode outlet, the flue gas preheater and the water supply preheater are sequentially connected through a pipeline;
the second mixer, the pre-reformer and the MCFC anode inlet are connected in sequence through pipelines;
the outlet of the MCFC anode is connected with the second mixer through a pipeline;
and the outlet of the MCFC anode is sequentially connected with the carbon dioxide recovery unit through a post-combustion chamber, an air preheater, a heat exchanger, a condenser and a pipeline.
And the output end of the MCFC is connected with a direct current/alternating current converter.
3. The combined solar and MCFC power generation system as claimed in claim 1, wherein the air preheater uses MCFC anode exhaust gas flowing therethrough to transfer its heat to the compressed air in the compressor for preheating the compressed air.
4. The combined gas-steam cycle power generation system integrating solar energy and an MCFC as recited in claim 1, wherein said heat exchanger utilizes MCFC anode exhaust gas flowing through it to transfer its heat to working medium water to evaporate, so that it expands in the turbine high pressure cylinder to do work.
5. The combined gas-steam cycle power generation system of claim 1, wherein the feed water preheater preheats the working fluid water by transferring heat to the working fluid water using MCFC cathode exhaust gas flowing therethrough.
6. The combined solar and MCFC integrated gas-steam cycle power generation system of claim 1 wherein the flue gas preheater utilizes MCFC cathode exhaust gas flowing therethrough to transfer its heat to the waste heat boiler exhaust gas for preheating the waste heat boiler exhaust gas.
7. The integrated solar and MCFC combined gas-steam cycle hybrid power generation system of claim 1, wherein the heat absorber is an air-based heat absorber.
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