CN112768724A - LOHC fuel cell power generation system and method - Google Patents
LOHC fuel cell power generation system and method Download PDFInfo
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- CN112768724A CN112768724A CN202110025995.7A CN202110025995A CN112768724A CN 112768724 A CN112768724 A CN 112768724A CN 202110025995 A CN202110025995 A CN 202110025995A CN 112768724 A CN112768724 A CN 112768724A
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- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
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- 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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- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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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
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- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
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- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
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- H—ELECTRICITY
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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
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Abstract
The invention discloses an LOHC fuel cell power generation system and method, which consists of four subsystems, namely a fuel cell, a high-temperature heat pump, an LOHC dehydrogenation subsystem and a Rankine cycle subsystem. Fuel cell subsystem, to convert H2Converting chemical energy into electric energy; the high-temperature heat pump subsystem converts the low-temperature heat energy of the fuel cell into high-temperature heat energy; the LOHC dehydrogenation subsystem realizes the LOHC dehydrogenation by utilizing high-temperature heat energy; and the Rankine cycle subsystem is used for converting the residual heat energy of the system into electric energy. Fuel cell power generation waste heat generatorWorking medium is quickly absorbed and taken away, efficient and stable work of the battery is guaranteed, a part of heat is used for driving Rankine cycle power generation, generated electric energy can be used for internal consumption of the system, a part of heat is used for LOHC dehydrogenation, and generated H2For use in fuel cells. The system and the method solve the problem of energy waste caused by mismatching of the working temperature of the fuel cell and the dehydrogenation temperature of the LOHC, reduce the adverse effect of dehydrogenation reaction energy consumption on the power generation efficiency of the fuel cell, and improve the overall energy utilization level.
Description
Technical Field
The invention belongs to the field of hydrogen energy, and particularly relates to an LOHC fuel cell power generation system and method.
Background
H2As a clean fuel in the true sense, the fuel is the key to solve the future environmental problems. The production, storage, transportation and use of the fuel are different from those of the traditional fuel, and the limitation of the energy density of unit volume makes the long-distance transportation difficult to be convenient and efficient like coal and oil. H2The standard boiling point (-253 ℃) of the hydrogen storage tank is far lower than that of natural gas (-162 ℃), the storage and transportation cost is too high by adopting a liquid hydrogen mode, and the problem of hydrogen brittleness in the pipeline transportation process is difficult to solve in a short time. Liquid Organic Hydrogen Carrier (LOHC) is a very potential H2The storage mode realizes high-density hydrogen storage through reversible catalytic hydrogenation and dehydrogenation reactions of unsaturated organic matters. Unlike metal hydrogen storage, LOHC is a fluid with properties similar to petroleum, with the potential to be compatible with existing gasoline stations. Once the organic liquid hydrogen storage technology is commercially applied, a brand new technical revolution is certainly brought to the world hydrogen energy industry.
Currently, the reported LOHC pairs are mainly: decahydronaphthalene (naphthalene), cyclohexane (benzene), bicyclohexane (biphenyl), perhydrodibenzyltoluene (dibenzyltoluene), dodecahydroethylcarbazole (ethylcarbazole), formic acid/methanol (carbon dioxide), and the like. The hydrogenation and dehydrogenation reaction conditions of the substances are different, but generally speaking, the dehydrogenation reaction is a strong endothermic reaction, and a catalyst must be used for accelerating the reaction speed. In addition, the endothermic heat of reaction is high (. about.60 kJ/mol-H) due to the generally low LOHC boiling point and thermal decomposition temperature2) To ensureHigh dehydrogenation rate and conversion rate are proved, the reaction temperature window is generally narrow, and the difficulty in maintaining the temperature window is high.
The scholars propose to realize the dehydrogenation of the LOHC by using the residual heat of the fuel cell, but the temperature mismatch of the fuel cell and the LOHC makes the implementation of the dehydrogenation difficult. Also, the student points out the utilization of H2The low temperature catalytic combustion provides energy for the LOHC dehydrogenation reaction, but the lower heat transfer coefficient on the flue gas side would allow the size of the device to be greatly increased.
How to reduce the adverse effect of the energy consumption of the LOHC dehydrogenation reaction on the power generation efficiency of the fuel cell, construct a more reliable and efficient integrated system, and improve the overall energy utilization rate is an important link for promoting the further development of the hydrogen fuel cell technology.
Disclosure of Invention
The invention aims to provide an LOHC fuel cell power generation system and method, which are used for realizing efficient power generation of a fuel cell system with LOHC as a hydrogen source, combine a high-temperature heat pump, Rankine cycle, LOHC dehydrogenation and a fuel cell, and absorb the residual heat of the cell by utilizing the phase change of a working medium in the cell to ensure the safe and stable operation of the fuel cell. The high-temperature heat pump converts low-temperature heat energy of the fuel cell into high-temperature heat energy for LOHC dehydrogenation; the electric energy generated by the rankine cycle can be used by a circulation pump, a compressor, and the like. The system and the method reduce the adverse effect of dehydrogenation reaction energy consumption on the power generation efficiency of the fuel cell and improve the overall energy utilization efficiency.
The invention is realized by adopting the following technical scheme:
an LOHC fuel cell power generation system comprises a fuel cell, a high-temperature heat pump, an LOHC dehydrogenation subsystem and a Rankine cycle subsystem; fuel cell subsystem, the primary site of energy conversion, for converting H2Including a dehumidifier, a mixer, a fuel cell and H2A buffer tank;
the high-temperature heat pump subsystem is used for improving the waste heat grade of the fuel cell so as to meet the temperature and energy requirements of LOHC dehydrogenation and comprises the fuel cell, a compressor, a dehydrogenation reactor and an expansion valve;
an LOHC dehydrogenation subsystem for utilizing the residual heat of the fuel cell to realize the LOHC dehydrogenationComprising a dehydrogenation reactor H2Desuperheater, heat recovery Heat exchanger and H2A buffer tank;
the Rankine cycle subsystem generates power by utilizing the residual heat of the system and is used by a compressor and a circulating pump and comprises a generator, an expander, a condenser, a circulating pump, a fuel cell and a dehydrogenation reactor;
the generator is connected with the expander through a coupler, an outlet of the expander is connected to a Rankine cycle working medium inlet of the condenser, the condenser is further provided with a cooling working medium inlet and a cooling working medium outlet, the Rankine cycle working medium outlet of the condenser is connected to the Rankine cycle working medium inlet of the fuel cell through a circulating pump, the Rankine cycle working medium outlet of the fuel cell is connected to the Rankine cycle working medium inlet of the dehydrogenation reactor, and the Rankine cycle working medium outlet of the dehydrogenation reactor is connected to the inlet of the expander;
the outlet of the mixer is connected to H of the fuel cell2Inlet, H of fuel cell2Recovery H with outlet connected to mixer through dehumidifier2The fuel cell is also provided with an oxidant inlet and an oxidant outlet, the heat pump working medium outlet of the fuel cell is connected to the heat pump working medium inlet of the dehydrogenation reactor through a compressor, and the heat pump working medium outlet of the dehydrogenation reactor is connected to the heat pump working medium inlet of the fuel cell through an expansion valve;
h of dehydrogenation reactor2The outlet is connected to H2Desuperheater H2Inlet, H2Desuperheater H2Outlet through H2The buffer tank is connected to the main H of the mixer2Inlet, H2The desuperheater is also provided with an LOHC inlet and an LOHC outlet;
H2an LOHC outlet of the desuperheater is connected to an undehydrogenatedLOHC inlet of the heat recovery heat exchanger, an undehydrogenatedLOHC outlet of the heat recovery heat exchanger is connected to an undehydrogenatedLOHC inlet of the dehydrogenation reactor, a dehydrogenated LOHC outlet of the dehydrogenation reactor is connected to a dehydrogenated LOHC inlet of the heat recovery heat exchanger, and a dehydrogenated LOHC outlet is further arranged on the heat recovery heat exchanger.
The invention is further improved in that the temperature rise of the high-temperature heat pump is determined according to the difference value between the working temperature of the fuel cell and the temperature of the dehydrogenation reactor, and the temperature rise is more than 50 ℃, a multi-stage compression or overlapping heat pump is adopted, so that the COP (coefficient of performance) of the heat pump is not lower than 1.25.
The invention has the further improvement that the high-temperature heat pump working medium and the Rankine cycle working medium are determined according to the LOHC dehydrogenation reaction temperature and the fuel cell working temperature, the standard boiling point of the heat pump working medium is lower than the fuel cell working temperature to avoid the negative pressure operation of the system, the critical temperature of the working medium must be higher than the LOHC dehydrogenation reaction temperature to ensure the stability of the dehydrogenation reaction temperature, the standard boiling point of the Rankine cycle working medium is lower than or close to the environmental temperature, and the critical temperature is higher than the fuel cell working temperature and is close to or higher than the LOHC dehydrogenation reaction temperature; the dehydrogenation reaction temperature is determined by the types of the LOHC and the catalyst, and the LOHC dehydrogenation reaction speed and the reaction limit are both considered; the working temperature of the fuel cell is determined according to the type of the cell, and the upper limit of the safe working temperature range of the cell is selected, so that the overall efficiency of the system is improved.
The invention is further improved in that when the superheat degree of the working medium at the outlet of the expansion machine is more than 10 ℃, the heat regenerator is added between the outlet of the expansion machine and the inlet of the circulating pump, so that the heat regenerator has a utilization value and a utilization space.
A further improvement of the invention is that the hot fluid in the heat recovery heat exchanger is dehydrogenated LOHC and the cold fluid is non-dehydrogenated LOHC.
The invention is further improved in that the circulating pump and the compressor are driven by a motor or directly driven by the expander.
An LOHC fuel cell power generation method using said LOHC fuel cell power generation system, comprising:
oxidizing agent and H2The reaction is carried out in the fuel cell and the electric energy is output, and the byproduct heat is taken away by the heat pump working medium and the Rankine cycle working medium, so that the efficient and stable work of the cell is ensured; the high-temperature heat pump consumes a small amount of high-grade energy, low-temperature heat energy of the fuel cell is converted into high-temperature heat energy, one part of the high-temperature heat energy is used for LOHC dehydrogenation, and the other part of the high-temperature heat energy is used for driving Rankine cycle power generation; dehydrogenated LOHC can be used to preheat non-dehydrogenated LOHC prior to entering the reactor, H produced by dehydrogenation2Cooled by low temperature LOHC that is not dehydrogenated.
The invention has at least the following beneficial technical effects:
the invention provides an LOHC fuel cell power generation system and a method. Wherein the fuel cell subsystem converts H2Converting chemical energy into electric energy; the high-temperature heat pump subsystem converts the low-temperature heat energy of the fuel cell into high-temperature heat energy; the LOHC dehydrogenation subsystem realizes the LOHC dehydrogenation by utilizing high-temperature heat energy; and the Rankine cycle subsystem is used for converting the residual heat energy of the system into electric energy.
Further, the temperature rise of the high-temperature heat pump is determined according to the difference value between the working temperature of the fuel cell and the temperature of the dehydrogenation reactor. When the temperature is higher, the technology of multi-stage compression, overlapping heat pump and the like can be adopted for improvement, so as to ensure that the heat pump obtains higher COP.
Further, Rankine cycle working medium and high-temperature heat pump working medium are determined according to the LOHC dehydrogenation reaction temperature and the working temperature of the fuel cell. The dehydrogenation reaction temperature is determined by the LOHC and the catalyst type, and the cell operating temperature is mainly related to the cell type.
Further, the hot fluid in the heat recovery heat exchanger is the dehydrogenated LOHC, and the cold fluid is the pre-dehydrogenated LOHC. The heat recovery heat exchanger adopts a counter-flow arrangement, the LOHC flow and the specific heat capacity before and after dehydrogenation are equivalent, and the energy loss in the heat recovery process is small.
Further, according to different Rankine cycle working media and different environments, the system can be improved correspondingly, so that the system can operate efficiently under different conditions.
Furthermore, the circulating pump and the compressor can be driven by a motor or directly driven by an expander.
In summary, according to the power generation system and method of the LOHC fuel cell provided by the invention, the high-temperature heat pump converts the power generation waste heat of the fuel cell into high-temperature heat energy for LOHC dehydrogenation, so that the adverse effect of dehydrogenation energy consumption on the overall efficiency is reduced; the waste heat of the Rankine cycle utilization system is used for generating electric energy which can be used by a compressor, a circulating pump and the like, and the energy utilization rate of the system is improved. Specifically, the high-efficiency power generation method of the LOHC fuel cell can ensure fuelOn the premise of safe and reliable operation of the battery, the waste heat generated in the working process of the fuel cell is utilized to generate electricity, the rapid and efficient dehydrogenation of the LOHC is realized, and the generated electric energy and H are2And can be partially or completely used for system. The method solves the problem of energy waste caused by mismatching of the working temperature of the fuel cell and the LOHC dehydrogenation temperature, reduces the adverse effect of dehydrogenation reaction energy consumption on the power generation efficiency of the fuel cell, and improves the overall energy utilization level.
The invention realizes the high-efficiency power generation of the fuel cell which takes the liquid organic matter as the hydrogen carrier, and has certain inspiring significance for the construction of other hydrogen storage media and fuel cell integrated systems.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention, wherein the dotted line represents H2The solid line represents an LOHC or rankine cycle working medium, the dotted line represents a high temperature heat pump working medium, and the dotted line represents an oxidant. FIG. 1 is intended only to illustrate the operating principles of the system and the components are not limited to the specific numbers, locations, and combinations enumerated.
Description of reference numerals:
1. generator, 2, expander, 3, condenser, 4, circulating pump, 5, dehumidifier, 6, mixer, 7, fuel cell, 8, compressor, 9, dehydrogenation reactor, 10, expansion valve, 11, H2Desuperheater, 12, heat recovery heat exchanger, 13, H2And a buffer tank.
Detailed Description
The present invention will be further described in detail by way of specific examples with reference to the following schematic drawings.
As shown in FIG. 1, the invention provides an LOHC fuel cell power generation system, which consists of four subsystems, namely a fuel cell, a high-temperature heat pump, LOHC dehydrogenation and Rankine cycle. Wherein the fuel cell subsystem converts H2Converting chemical energy into electric energy; the high-temperature heat pump subsystem converts the low-temperature heat energy of the fuel cell into high-temperature heat energy; the LOHC dehydrogenation subsystem realizes the LOHC dehydrogenation by utilizing high-temperature heat energy; and the Rankine cycle subsystem is used for converting the residual heat energy of the system into electric energy.
Fuel cell subsystem is by dehumidifier5. Mixer 6, fuel cell 7, H2Buffer tank 13 and relevant connecting lines, bypass circuit, valve, temperature sensor, pressure sensor, etc. Dehumidifier 5 outlet and H2The outlet of the buffer tank 13 is connected with the inlet of the mixer 6, and the outlet of the mixer is connected with the H of the fuel cell 72Inlet, H of fuel cell 72The outlet is connected with the inlet of the dehumidifier 5.
The high-temperature heat pump subsystem is composed of a fuel cell 7, a compressor 8, a dehydrogenation reactor 9, an expansion valve 10, relevant connecting pipelines, a bypass loop, a valve, a temperature sensor, a pressure sensor and the like. The heat pump working medium outlet of the fuel cell 7 is connected with the inlet of the compressor 8, the outlet of the compressor 8 is connected with the heat pump working medium inlet of the dehydrogenation reactor 9, the heat pump working medium outlet of the dehydrogenation reactor 9 is connected with the inlet of the expansion valve 10, and the outlet of the expansion valve 10 is connected with the working medium inlet of the fuel cell heat pump 7.
The LOHC dehydrogenation subsystem consists of dehydrogenation reactor 9 and H2Desuperheater 11, heat recovery heat exchanger 12, H2Buffer tank 13 and relevant connecting lines, bypass circuit, valve, temperature sensor, pressure sensor, etc. H2The LOHC outlet of the desuperheater 11 is connected with the undehydrogenatedLOHC inlet of the heat recovery heat exchanger 12, the undehydrogenatedLOHC outlet of the heat recovery heat exchanger 12 is connected with the undehydrogenatedLOHC inlet of the dehydrogenation reactor 9, the dehydrogenated LOHC outlet of the dehydrogenation reactor 9 is connected with the dehydrogenated LOHC inlet of the heat recovery heat exchanger 12, and the H of the dehydrogenation reactor 92Outlet connection H2H of desuperheater 112Inlet, H2H of desuperheater 112Outlet connection H2Buffer tank 13.
The Rankine cycle subsystem is composed of a generator 1, an expander 2, a condenser 3, a circulating pump 4, a fuel cell 7, a dehydrogenation reactor 9, relevant connecting pipelines, a bypass loop, valves, temperature sensors, pressure sensors and the like. An outlet of the circulating pump 4 is connected with a Rankine cycle working medium inlet of the fuel battery 7, a Rankine cycle working medium outlet of the fuel battery 7 is connected with a Rankine cycle working medium inlet of the dehydrogenation reactor 9, a Rankine cycle working medium outlet of the dehydrogenation reactor 9 is connected with an inlet of the expansion machine 2, an outlet of the expansion machine 2 is connected with a Rankine cycle working medium inlet of the condenser 3, a Rankine cycle working medium outlet of the condenser 3 is connected with an inlet of the circulating pump 4, and the generator 1 is connected with the expansion.
The invention provides an LOHC fuel cell power generation method, which comprises the following steps: oxidizing agent and H2The reaction is carried out in the fuel cell and the electric energy is output, and the byproduct heat is taken away by the heat pump working medium and the Rankine cycle working medium, so that the efficient and stable work of the cell is ensured. The high-temperature heat pump consumes a small amount of high-grade energy, low-temperature heat energy of the fuel cell is converted into high-temperature heat energy, one part of the high-temperature heat energy is used for LOHC dehydrogenation, and the other part of the high-temperature heat energy is used for driving Rankine cycle power generation. Dehydrogenated LOHC can be used to preheat non-dehydrogenated LOHC prior to entering the reactor, H produced by dehydrogenation2Cooled by low temperature LOHC that is not dehydrogenated. The power generation method of the LOHC fuel cell can generate power by utilizing waste heat generated in the working process of the fuel cell on the premise of ensuring the safe and reliable operation of the fuel cell, realize the rapid and efficient dehydrogenation of the LOHC, and generate electric energy and H2And can be partially or completely used for system. The method solves the problem of energy waste caused by mismatching of the working temperature of the fuel cell and the LOHC dehydrogenation temperature, reduces the adverse effect of dehydrogenation reaction energy consumption on the power generation efficiency of the fuel cell, and improves the overall energy utilization level.
The core idea of the embodiment of the invention is as follows: the Rankine cycle working medium and the heat pump working medium are used for absorbing the waste heat generated by the fuel cell, the fuel cell is guaranteed to operate at a safe temperature and high efficiency, the electric energy generated by the Rankine cycle can be used for consumption in the system, the heat pump converts low-temperature heat energy into high-temperature heat energy, the LOHC dehydrogenation energy requirement is met, the adverse effect of the LOHC dehydrogenation energy consumption is reduced, and the overall energy utilization efficiency of the system is improved.
According to the embodiment, in order to ensure that the fuel cell and the dehydrogenation reactor always work in respective optimal temperature ranges, the temperature is controlled by monitoring the temperature and regulating and controlling the compressor, the circulating pump and the like, and the safe and efficient operation of the system is ensured.
Claims (7)
1. An LOHC fuel cell power generation system is characterized by comprising four subsystems of a fuel cell, a high-temperature heat pump, LOHC dehydrogenation and Rankine cycle;
fuel cell subsystem, the primary site of energy conversion, for converting H2Comprises a dehumidifier (5), a mixer (6), a fuel cell (7) and H2A buffer tank (13);
the high-temperature heat pump subsystem is used for improving the waste heat grade of the fuel cell so as to meet the temperature and energy requirements of LOHC dehydrogenation and comprises a fuel cell (7), a compressor (8), a dehydrogenation reactor (9) and an expansion valve (10);
the LOHC dehydrogenation subsystem realizes the LOHC dehydrogenation by utilizing the waste heat of the fuel cell and comprises a dehydrogenation reactor (9) and H2Desuperheater (11), heat recovery Heat exchanger (12) and H2A buffer tank (13);
the Rankine cycle subsystem generates power by utilizing the residual heat of the system and is used by a compressor and a circulating pump, and comprises a generator (1), an expander (2), a condenser (3), a circulating pump (4), a fuel cell (7) and a dehydrogenation reactor (9);
the generator (1) is connected with the expander (2) through a coupler, an outlet of the expander (2) is connected to a Rankine cycle working medium inlet of the condenser (3), a cooling working medium inlet and a cooling working medium outlet are further arranged on the condenser (3), the Rankine cycle working medium outlet of the condenser (3) is connected to the Rankine cycle working medium inlet of the fuel cell (7) through the circulating pump (4), the Rankine cycle working medium outlet of the fuel cell (7) is connected to the Rankine cycle working medium inlet of the dehydrogenation reactor (9), and the Rankine cycle working medium outlet of the dehydrogenation reactor (9) is connected with an inlet of the expander (2);
the outlet of the mixer (6) is connected to H of the fuel cell (7)2Inlet, H of fuel cell (7)2Recovery H with outlet connected to mixer (6) through dehumidifier (5)2The heat pump;
h of dehydrogenation reactor (9)2The outlet is connected to H2H of desuperheater (11)2Inlet, H2H of desuperheater (11)2Outlet through H2The buffer tank (13) is connected to the main H of the mixer (6)2Inlet, H2The desuperheater (11) is also provided with an LOHC inlet and an LOHC outlet;
H2an LOHC outlet of the desuperheater (11) is connected to an undehydrogenatedLOHC inlet of the heat recovery heat exchanger (12), an undehydrogenatedLOHC outlet of the heat recovery heat exchanger (12) is connected to an undehydrogenatedLOHC inlet of the dehydrogenation reactor (9), a dehydroLOHC outlet of the dehydrogenation reactor (9) is connected to a dehydroLOHC inlet of the heat recovery heat exchanger (12), and a dehydroLOHC outlet is further arranged on the heat recovery heat exchanger (12).
2. An LOHC fuel cell power generation system in accordance with claim 1, wherein the high temperature heat pump exotherm is determined by the difference between the fuel cell operating temperature and the dehydrogenation reactor temperature, the exotherm >50 ℃ being achieved by a multi-stage compression or overlapping heat pump to ensure a heat pump COP of no less than 1.25.
3. The power generation system of claim 1, wherein the high temperature heat pump working medium and the rankine cycle working medium are both determined according to the LOHC dehydrogenation reaction temperature and the fuel cell working temperature, the normal boiling point of the heat pump working medium is lower than the fuel cell working temperature to avoid the negative pressure operation of the system, the critical temperature of the working medium must be higher than the LOHC dehydrogenation reaction temperature to ensure the dehydrogenation reaction temperature to be stable, the normal boiling point of the rankine cycle working medium is lower than or close to the ambient temperature, and the critical temperature is higher than the fuel cell working temperature and close to or higher than the LOHC dehydrogenation reaction temperature; the dehydrogenation reaction temperature is determined by the types of the LOHC and the catalyst, and the LOHC dehydrogenation reaction speed and the reaction limit are both considered; the working temperature of the fuel cell is determined according to the type of the cell, and the upper limit of the safe working temperature range of the cell is selected, so that the overall efficiency of the system is improved.
4. An LOHC fuel cell power generation system in accordance with claim 1, wherein a regenerator is added between the expander outlet and the recycle pump inlet when the degree of superheat of the expander outlet working fluid is >10 ℃ which has utility value and space.
5. An LOHC fuel cell power generation system in accordance with claim 1, wherein the hot fluid in the heat recovery heat exchanger (12) is dehydrogenated LOHC and the cold fluid is non-dehydrogenated LOHC.
6. An LOHC fuel cell power generation system in accordance with claim 1, wherein the circulation pump (4) and the compressor (8) are driven by a motor, or are directly driven by the expander (2).
7. An LOHC fuel cell power generation method using an LOHC fuel cell power generation system described in any one of claims 1 to 6, comprising:
oxidizing agent and H2The reaction is carried out in the fuel cell and the electric energy is output, and the byproduct heat is taken away by the heat pump working medium and the Rankine cycle working medium, so that the efficient and stable work of the cell is ensured; the high-temperature heat pump consumes a small amount of high-grade energy, low-temperature heat energy of the fuel cell is converted into high-temperature heat energy, one part of the high-temperature heat energy is used for LOHC dehydrogenation, and the other part of the high-temperature heat energy is used for driving Rankine cycle power generation; dehydrogenated LOHC can be used to preheat non-dehydrogenated LOHC prior to entering the reactor, H produced by dehydrogenation2Cooled by low temperature LOHC that is not dehydrogenated.
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| CN202110025995.7A CN112768724B (en) | 2021-01-08 | 2021-01-08 | LOHC fuel cell power generation system and method |
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