CN108005742B - Solid oxide fuel cell driven combined cooling, heating and power system capable of being partially recycled - Google Patents
Solid oxide fuel cell driven combined cooling, heating and power system capable of being partially recycled Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M2008/1293—Fuel cells with solid oxide electrolytes
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Abstract
The invention discloses a solid oxide fuel cell driving combined cooling heating and power system capable of being partially recycled, which comprises a fuel cell system, an organic Rankine power sub-circulation system and an ammonia absorption type refrigeration sub-circulation system, wherein after the fuel cell system generates electricity, exhaust smoke is released by a waste heat boiler to drive the organic Rankine power circulation to generate electricity and supply heat, and then drives the ammonia absorption refrigeration sub-circulation system and reverse refrigeration, so that the fuel is fully and efficiently utilized.
Description
Technical Field
The invention relates to a combined cooling heating and power system, in particular to a combined cooling, heating and power system driven by a solid oxide fuel cell and capable of being partially recycled.
Background
Energy is an important material basis on which human beings live and develop, and fossil energy such as coal and petroleum is being consumed in large quantities in the rapid development of contemporary society. However, fossil energy is not renewable, and as the consumption amount is increased, fossil energy has become a scarce energy source, and the cost for developing and using fossil energy is increasing. Therefore, the search for sustainable and clean energy is a major issue to be solved by urgent needs of countries in the world. A Solid Oxide Fuel Cell (SOFC) is a high-efficiency power generation device that directly converts chemical energy of fuel into electric energy, and because it is not limited by carnot cycle, the energy conversion efficiency reaches about 70%, and the reaction products mainly include water and carbon dioxide (CO)2) While water is free of pollution, CO2The emission of the energy is also much lower than that of the common method, so the energy is a clean energy in a real sense. And under the severe conditions of energy shortage and serious environmental pollution, the fuel cell has high energy conversion efficiency and environmentFriendly, low in noise, capable of continuously working and the like, and the application is continuously expanded.
The solid oxide fuel cell realizes CO while converting work due to the unique internal structure2Is more beneficial to CO2Low energy consumption recovery. And the exhaust gas temperature of the SOFC is higher, and the SOFC can be integrated with other circulations into a composite system, thereby recovering the energy of the exhaust gas and improving the system efficiency. In a general SOFC composite cycle, after reaction in a cell stack, gas from a cathode and gas from an anode are mixed and combusted, so that the efficiency of a fuel cell is further improved. But after the electrochemical reaction is completed in the stack, the CO of the anode2High concentration, and is favorable for CO2When the recovery of (2) is mixed with the exhaust gas from the cathode and burned, although the efficiency of the fuel cell is improved, a plurality of gases such as oxygen, nitrogen, water and carbon dioxide are mixed, which is not favorable for CO2And (6) recovering. In the research, a method that the cathode and the anode of the SOFC are not contacted is adopted, and mixed gas of anode exhaust gas which is not completely reacted is introduced into a post-combustion chamber and is mixed and combusted with pure oxygen. The products of combustion being only CO2And water, water is separated by cooling, CO2The concentration of (A) can reach 99%. The cathode only contains oxygen and nitrogen, and the environment is not affected at all. The method can recover CO well2However, the post-combustion chamber is lower in recombination efficiency than a general SOFC, and the post-combustion chamber is used for pure oxygen combustion, so that the temperature is very high, and the load on a combustor is large. On the basis, partial recovery of anode exhaust gas is proposed, and the anode exhaust gas is mixed with fuel and then enters the SOFC stack again to ensure better recovery of CO2On the basis of (2), the composite efficiency of the SOFC is not reduced.
Organic Rankine Cycle (ORC) systems use low boiling point organic compounds as operating working media, which are more advantageous than traditional power cycles in matching with medium and low temperature heat sources, and thus become one of effective ways for waste heat utilization. Under different heat source conditions, the selection of different organic Rankine cycle structures and operation working media has important significance for improving the thermal performance of the system.
In view of the high temperature of the exhaust gas from the fuel cell,to further improve the fuel utilization efficiency, the heat efficiency and
the efficiency can couple the organic Rankine cycle with the fuel cell, namely exhaust drives the organic Rankine cycle to generate power and supply heat through the waste heat boiler, and then the exhaust temperature is still high, so that the flue gas from the waste heat boiler can be introduced into the ammonia absorption type refrigeration cycle system for further recovering the flue gas waste heat, thereby realizing combined cooling, heating and power supply and providing a new solution for the efficient operation of the fuel cell.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a solid oxide fuel cell driven combined cooling heating and power system capable of being partially recycled, which comprises a fuel cell system, an organic Rankine power sub-circulation system and an ammonia absorption type refrigeration sub-circulation system, wherein after the fuel cell system generates electricity, exhaust smoke is released by a waste heat boiler (HRVG) to release heat to drive the organic Rankine power cycle to generate electricity and supply heat, and then the ammonia absorption refrigeration sub-circulation is driven to refrigerate, so that the fuel is fully and efficiently utilized.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the system comprises an SOFC system, an organic Rankine cycle system and an ammonia absorption type refrigeration cycle system, wherein the SOFC system carries out electrochemical reaction and outputs electric energy to the outside, after the electrochemical reaction of the SOFC system is finished, part of exhaust gas of the anode of the fuel cell is recycled and heated and then enters the anode of the fuel cell again for electrochemical reaction, the exhaust gas of the cathode of the fuel cell drives the organic Rankine cycle system to work to the outside through heat exchange of a waste heat boiler, and the exhaust gas after heat exchange drives the ammonia absorption type refrigeration cycle system to refrigerate through a steam generator.
Further, in the SOFC system, fuel is preheated by a heat exchanger V after being compressed by a fuel compressor; after being pressurized by a pump I, water is preheated by a heat exchanger I; the pressurized and preheated water and fuel are mixed with a part of recovered gaseous working medium discharged from the anode of the fuel cell, the mixed working medium is heated by a heat exchanger II and then enters a reformer to carry out reforming reaction, and the reformed mixed gas is introduced into the anode of the fuel cell.
Further, in the SOFC system, air is compressed by an air compressor and then sequentially flows through a heat exchanger IV and a heat exchanger III to be preheated, and the preheated high-pressure air is introduced into a cathode of the fuel cell.
Furthermore, the mixed gas introduced into the anode of the fuel cell and the air introduced into the cathode of the fuel cell generate electrochemical reaction in the fuel cell, and electric energy is output outwards.
Further, after the electrochemical reaction is finished, exhaust gas of a cathode of the fuel cell is expanded by the turbine I to do work and then is changed into low-pressure exhaust gas, the low-pressure exhaust gas enters the heat exchanger IV to preheat air, and then the low-pressure exhaust gas is introduced into the waste heat boiler to exchange heat in the waste heat boiler so as to drive the organic Rankine cycle system to do work outwards.
Further, after the electrochemical reaction is finished, the exhaust of the anode of the fuel cell is firstly preheated by the heat exchanger II to reform the mixed working medium, and then is divided into two paths, wherein one path is mixed with the pressurized and preheated fuel and the pressurized and preheated water, and the other path enters the combustor to be fully mixed with oxygen and then is completely combusted.
Further, high-temperature exhaust gas after complete combustion in the combustor sequentially passes through the heat exchanger III to preheat air, the heat exchanger V to preheat pressurized fuel, and the heat exchanger I to preheat pressurized water and then enters CO2A separation and recovery system.
Further, said CO2The separation and recovery system carries out cooling and compression treatment on the gas product to recover water and CO in the product2The recovered product water is re-entered into the SOFC system by pump I.
Further, in the organic Rankine cycle system, organic working medium gas enters a turbine II to expand and do work, then exchanges heat through a heat regenerator I, then flows into a condenser I, is condensed into saturated solution in the condenser I, and simultaneously supplies heat to the outside through the condenser I; the condensed liquid working medium is pressurized by a pump II and then enters a heat regenerator I for preheating, the preheated organic working medium enters a waste heat boiler and is heated again from the liquid organic working medium into superheated organic working medium gas by the cathode exhaust of the fuel cell, and then the superheated organic working medium gas enters a turbine II for expansion and work, so that the next working cycle is carried out.
Further, in the ammonia absorption refrigeration system, basic working fluid from an absorber is pressurized by a pump III and then enters a heat regenerator II for preheating, and then is heated in a steam generator; the saturated steam generated by heating through the steam generator enters a rectifying tower for rectification, high-concentration ammonia saturated steam is obtained at the tower top, and a dilute saturated solution is obtained at the tower bottom; the dilute saturated solution at the bottom of the rectifying tower flows back into the steam generator and then is discharged from the bottom of the generator, then flows through the heat regenerator II for heat exchange, and then enters the absorber again after being throttled by the throttle valve I; high-concentration ammonia saturated steam at the top of the rectifying tower enters a condenser II to be condensed into saturated solution, and then enters an evaporator for evaporation and refrigeration after being throttled by a throttle valve II; the ammonia vapor at the outlet of the evaporator enters the absorber to be absorbed by the dilute solution, thereby completing a cycle process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the fuel cell generates electricity through electrochemical reaction, is clean and pollution-free, the cathode is not contacted with the anode product, carbon dioxide in anode waste gas is convenient to recover, only oxygen and nitrogen are used as cathode working media, and the atmospheric environment is not polluted.
(2) The SOFC fuel cell has the advantages that the cathodes only contain oxygen and nitrogen, the exhaust temperature is high, the quantity of the cathodes is larger than that of the anodes, the SOFC system is integrated and coupled with the organic Rankine cycle and the refrigeration cycle by the combined supply system, the cycle work capacity and the refrigeration capacity are increased, part of heat is recycled for heat supply, and the heat efficiency of the combined supply system are improved
Efficiency.
(3) The organic Rankine cycle adopts a regenerative mode, the working medium adopts toluene as a circulating working medium, the toluene is stable in property and better in matching with the system, and the recovery of the cathode waste heat of the fuel cell is facilitated; the refrigeration cycle adopts an ammonia absorption type refrigeration cycle system, and the ammonia absorption type refrigeration technology is mature, has good refrigeration effect, simple elements and small volume, and is convenient for the practical application of an integrated system.
(4) The exhaust gas at the outlet of the anode of the fuel cell can be partially recycled, and the recycling proportion is adjustable, and the adjustable range is 0-0.3. The exhaust gas from the anode comprises CO and CO2、H2And H2And O, partial recovery is carried out, so that the fuel utilization rate and the power generation amount of the fuel cell can be improved, the loads of a combustor and a reformer are reduced, and the service life of the combustor and the reformer is prolonged. Under the condition that the steam-carbon ratio is certain, the partial recovery can reduce the demand for external water, and the cost can be reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 shows a combined cooling heating and power system driven by an SOFC in accordance with the present invention.
Wherein, T1-turbine I; t2-turbine II; HE 1-heat exchanger I; HE 2-heat exchanger II; HE 3-heat exchanger III; HE 4-heat exchanger IV; HE 5-heat exchanger V; an R-prereformer; r1-regenerator I; b-a burner; r2 — regenerator II; con 1-condenser I; con 2-condenser II; P1-Pump I; P2-Pump II; P3-Pump III; HRVG-waste heat boiler; c1-fuel compressor; c2-air compressor; C3-CO2A compressor; v1-expansion valve I; v2-expansion valve II; a Rec-rectification column; g-a steam generator; an Abs-absorber; an Eva-evaporator; SOFC-fuel cell.
Detailed Description
The invention is further described with reference to the following detailed description of embodiments and drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As described in the background art, the problems of energy shortage and environmental pollution caused by energy use still exist in the prior art, and in order to solve the technical problems, the application provides a solid oxide fuel cell driving combined cooling heating and power system capable of being partially recycled, the system is composed of a fuel cell system, an organic rankine power sub-circulation system and an ammonia absorption type refrigeration sub-circulation system, after the fuel cell system generates electricity, cathode exhaust gas firstly releases heat through a waste heat boiler to drive the organic rankine power circulation to generate electricity and supply heat, then drives the ammonia absorption refrigeration sub-circulation, and meanwhile, exhaust gas of an anode part of the fuel cell is recycled, so that the fuel is fully and efficiently utilized.
As shown in fig. 1, a solid oxide fuel cell driven combined cooling heating and power system capable of being partially recycled includes an SOFC system, an Organic Rankine Cycle (ORC) system and an ammonia absorption refrigeration cycle system, the SOFC system performs an electrochemical reaction and outputs electric energy to the outside, after the electrochemical reaction of the SOFC system is completed, a part of exhaust gas at an anode of a fuel cell of the SOFC system is recycled and heated, and then enters the anode of the fuel cell again for the electrochemical reaction, exhaust gas at a cathode of the fuel cell is subjected to heat exchange by a waste heat boiler (HRVG) to drive the Organic Rankine Cycle (ORC) system to work to the outside, and the exhaust gas after the heat exchange drives the ammonia absorption refrigeration system to perform refrigeration by a steam generator.
The SOFC system includes a fuel cell (SOFC), a pump I (P1), a fuel compressor (C1), a reformer (R), a combustor (B), an air compressor (C2), a turbine I (T1), a heat exchanger I (HE1), a heat exchanger II (HE2), a heat exchanger III (HE3), a heat exchanger IV (HE4), and a heat exchanger V (HE 5).
In the SOFC system, fuel (1) is compressed by a fuel compressor (C1) (2) and preheated by a heat exchanger V (HE5) (3); pressurizing water (15) by a pump I (P1) (16), and preheating by a heat exchanger I (HE1) (17); mixing pressurized and preheated water (17), pressurized and preheated fuel (3) and recycled part of gaseous working medium (8f) discharged from the anode of the fuel cell, heating the mixed working medium (4) by a heat exchanger II (HE2) and then feeding (5) into a reformer (R) for reforming reaction, reforming water and fuel such as methane to generate carbon monoxide and hydrogen, and feeding reformed mixed gas (6) into the anode of the fuel cell; air (18) is compressed (19) by an air compressor (C2), preheated (20) by a heat exchanger IV (HE4), preheated by a heat exchanger III (HE3) and then enters a cathode of a fuel cell; the mixed gas entering the anode of the fuel cell and the air entering the cathode of the fuel cell generate electrochemical reaction in the fuel cell, and electric energy is output outwards.
After the electrochemical reaction of the fuel cell is finished, exhaust gas (22) from a cathode is expanded by a turbine I (T1) to work and then is changed into low-pressure exhaust gas (23), the low-pressure exhaust gas (23) preheats air (24) through a heat exchanger IV (HE4) and then is introduced into a waste heat boiler (HRVG) to drive an organic Rankine cycle to work outwards; after the electrochemical reaction of the fuel cell is finished, the mixed working medium before the exhaust (7) from the anode is preheated and reformed through a heat exchanger II (HE2) and then is divided into two paths, one path (8f) is mixed with the pressurized and preheated fuel (3) and the pressurized and preheated water (17), and the other path (9) enters a combustor (B) to be fully and completely mixed with oxygen (10) for combustion.
The gas product (11) from the burner after complete combustion passes through heat exchanger III (HE3) to preheat air (12), heat exchanger V (HE5) to preheat pressurized fuel (13) and heat exchanger I (HE1) to preheat pressurized water (14) and then enters CO2A separation and recovery system.
CO2The separation and recovery system carries out cooling and compression treatment on the gas product to recover water and CO in the product2The recovered product water is re-entered into the SOFC system by pump I.
The organic Rankine cycle system comprises a waste heat boiler (HRVG), a turbine II (T2), a heat regenerator I (R1), a condenser I (Con1) and a pump II (P2). When the system works, organic working medium gas (27) enters a turbine II (T2) to expand and do work, low-pressure exhaust gas (28) which does work firstly passes through a heat regenerator I (R1) for heat exchange (29), then flows into a condenser I (Con1), is condensed into saturated solution (30) in the condenser I (Con1), and simultaneously supplies heat to the outside through the condenser I (Con 1); the condensed liquid working medium is pressurized by a pump II (P2) and then enters a heat regenerator I (R1) for preheating, the preheated organic working medium (32) enters a waste heat boiler (HRVG) and is heated into superheated organic working medium gas by fuel cell cathode exhaust gas from the liquid organic working medium again, and then the superheated organic working medium gas enters a turbine for expansion and work application to perform the next working cycle.
And the high-temperature gas from the waste heat boiler is used as a driving heat source to drive the ammonia absorption type refrigeration cycle system to refrigerate.
The ammonia absorption refrigeration cycle system comprises a steam generator (G), a rectifying tower (Rec), a condenser II (Con2), a throttle valve I (V1), a throttle valve II (V2), a heat regenerator II (R2), an evaporator (Eva), an absorber (Abs) and a pump III (P3). In the refrigeration cycle system, basic working fluid (33) from an absorber is pressurized by a pump III (P3) (34) and then enters a heat regenerator II (R2) for heat exchange (35), and then is heated by exhaust gas in a steam generator (G); saturated steam (39) generated by heating through a steam generator (G) enters a rectifying tower (Rec) for rectification, high-concentration ammonia saturated steam is obtained at the top of the tower, and a dilute saturated solution (40) is obtained at the bottom of the tower; the dilute saturated solution (40) at the bottom of the rectifying tower flows back into the steam generator and then is discharged from the bottom of the generator (36), then flows through a heat regenerator II (R2) for heat exchange (37), and then enters an absorber (Abs) after being throttled by a throttle valve I (V1) (38); high-concentration ammonia saturated vapor (41) at the top of the rectifying tower enters a condenser II (Con2) to be condensed into saturated solution (42), and then enters an evaporator (Eva) for evaporation and refrigeration after being throttled by a throttle valve II (V2) (43); the ammonia vapor (44) at the outlet of the evaporator enters the absorber to be absorbed by the dilute solution (19), thereby completing a circulation process.
In the specific implementation, the invention establishes a thermodynamic model of the combined cooling heating and power system by using EES software. For ease of analysis and discussion, the fuel methane selected herein has a molar flow rate of 0.0616mol · s-1The organic cycle working medium of the organic Rankine power sub-cycle is toluene, and other input parameter values of the combined supply system are shown in Table 1.
TABLE 1 System input parameters
And calculating the thermodynamic parameter values of each state point of the system according to the established thermodynamic model and the physical property parameters of the working medium, wherein the thermodynamic parameter values are shown in a table 2. The performance calculation results of the novel combined cooling heating and power system are shown in table 3, and the calculation results show that under the design working condition, the combined heating and power system combined heating and power heat efficiency provided by the system is 72.27%, and the combined heating and power system combined heating and power efficiency is combined
The efficiency is 56.81%, the organic Rankine power sub-cycle efficiency is 21.03%, and the ammonia absorption refrigeration COP is 0.4804.
TABLE 2 calculation results for each point in the cycle
TABLE 3 Cogeneration System Performance parameters
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (9)
1. But partial recycle's solid oxide fuel cell drive cold and hot electricity cogeneration system, its characterized in that: the system comprises an SOFC system, an organic Rankine cycle system and an ammonia absorption type refrigerating system, wherein the SOFC system carries out electrochemical reaction and outputs electric energy to the outside, after the electrochemical reaction of the SOFC system is finished, part of exhaust gas of an anode of a fuel cell is recycled and heated and then enters the anode of the fuel cell again for electrochemical reaction, the exhaust gas of a cathode of the fuel cell drives the organic Rankine cycle system to work to the outside through heat exchange of a waste heat boiler, and the exhaust gas after heat exchange drives the ammonia absorption type refrigerating cycle system to refrigerate through a steam generator;
in the SOFC system, fuel is preheated by a heat exchanger V after being compressed by a fuel compressor; after being pressurized by a pump I, water is preheated by a heat exchanger I; the pressurized and preheated water and fuel are mixed with a part of recovered gaseous working medium discharged from the anode of the fuel cell, the mixed working medium is heated by a heat exchanger II and then enters a reformer to carry out reforming reaction, and the reformed mixed gas is introduced into the anode of the fuel cell.
2. The system of claim 1, wherein in the SOFC system, air is compressed by an air compressor, then passes through heat exchanger IV and heat exchanger III in sequence for preheating, and the preheated high pressure air is introduced into the cathode of the fuel cell.
3. The partially recyclable solid oxide fuel cell-driven combined cooling heating and power system as claimed in claim 1 or 2, wherein the mixed gas introduced into the anode of the fuel cell and the air introduced into the cathode of the fuel cell are electrochemically reacted inside the fuel cell to output electric energy to the outside.
4. The partially recyclable solid oxide fuel cell driven combined cooling heating and power system as claimed in claim 1, wherein after the electrochemical reaction is completed, the exhaust gas of the cathode of the fuel cell is expanded by a turbine I to work and then becomes low-pressure exhaust gas, the low-pressure exhaust gas enters a heat exchanger IV to preheat air, and then enters a waste heat boiler, and heat exchange is performed in the waste heat boiler to drive the organic rankine cycle system to work outwards.
5. The partially recyclable solid oxide fuel cell driven combined cooling heating and power system as claimed in claim 1, wherein after the electrochemical reaction is completed, the exhaust gas from the anode of the fuel cell is first preheated by the heat exchanger II and reformed into a mixed working medium, and then divided into two paths, wherein one path is mixed with the pressurized and preheated fuel and the pressurized and preheated water, and the other path enters the combustor to be fully mixed with oxygen and then is completely combusted.
6. The partially recyclable solid oxide fuel cell driven combined cooling heating and power system as claimed in claim 5, wherein the gas products from complete combustion in the combustor are passed sequentially through heat exchanger III to preheat air, heat exchanger V to preheat pressurized fuel, and heat exchanger I to preheat pressurized water before entering CO2A separation and recovery system.
7. The partially recyclable solid oxide fuel cell driven combined cooling and heating power system of claim 6, wherein the CO is supplied from a gas supply system to the solid oxide fuel cell2The separation and recovery system carries out cooling and compression treatment on the gas product to recover water and CO in the product2The recovered product water is re-entered into the SOFC system by pump I.
8. The partially recyclable solid oxide fuel cell driven combined cooling heating and power system as claimed in claim 1, wherein in the organic rankine cycle system, organic working medium gas enters a turbine II to expand and do work, then passes through a heat regenerator I to exchange heat, then flows into a condenser I, is condensed into a saturated solution in the condenser I, and simultaneously supplies heat to the outside through the condenser I; the condensed liquid working medium is pressurized by a pump II and then enters a heat regenerator I for preheating, the preheated organic working medium enters a waste heat boiler and is heated again from the liquid organic working medium into superheated organic working medium gas by the cathode exhaust of the fuel cell, and then the superheated organic working medium gas enters a turbine II for expansion and work, so that the next working cycle is carried out.
9. The partially recyclable solid oxide fuel cell-driven combined cooling heating and power system according to claim 1, wherein in the ammonia absorption refrigeration cycle system, the basic working fluid from the absorber is pressurized by a pump III, then enters a heat regenerator II for preheating, and then is heated in a steam generator; saturated steam generated by heating through a steam generator enters a rectifying tower for rectification, high-concentration ammonia saturated steam is obtained at the tower top, and a dilute saturated solution is obtained at the tower bottom; the dilute saturated solution at the bottom of the rectifying tower flows back into the steam generator and then is discharged from the bottom of the generator, then flows through the heat regenerator II for heat exchange, and then enters the absorber again after being throttled by the throttle valve I; high-concentration ammonia saturated vapor at the top of the rectifying tower enters a condenser II to be condensed into saturated solution, and then enters an evaporator for evaporation and refrigeration after being throttled by a throttle valve II; the ammonia vapor at the outlet of the evaporator enters the absorber to be absorbed by the dilute solution, thereby completing a cycle process.
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