A fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking for hydrogen production

Abstract

The application relates to the technical field of comprehensive energy utilization, and discloses a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking hydrogen production. The system comprises a cooling system, an ammonia hydrogen production system, an internal combustion engine system, a fuel cell system, an electricity storage system and a waste heat recovery system; the ammonia hydrogen production system is connected with the internal combustion engine system, the ammonia hydrogen production system is connected with the fuel cell system, the cooling system is connected with the internal combustion engine system and the fuel cell system, the electricity storage system is connected with the internal combustion engine system and the fuel cell system, and the waste heat recovery system is connected with the internal combustion engine system, the ammonia hydrogen production system and the fuel cell system. The fuel cell and the internal combustion engine are combined, chemical energy and mechanical energy in the system are fully utilized to be converted into electric energy, the system has the advantages of fast starting and responding speed, simple and reliable structure, lower maintenance cost and the like, and has a good application prospect in the fields of distributed power generation and heavy-load equipment application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy comprehensive utilization, and particularly relates to a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking for hydrogen production. BACKGROUND

[0002] Ammonia is a hydrogen-rich carrier and the second largest synthetic industrial chemical in the world. Ammonia can not only be used as a hydrogen carrier for hydrogen production, but also has good safety, easy storage and processing, no harmful gas or greenhouse gas emissions, and good economic efficiency compared to other common fuels, and has great development potential. Catalytic reforming of ammonia to generate nitrogen and hydrogen, and then converting the hydrogen in the reformer into electricity in a fuel cell and an internal combustion engine is a high-power and high-efficiency power generation method.

[0003] Most of the current distributed energy systems and power generation systems in heavy equipment are fuel cells alone or fuel cells combined with other energy storage devices, which are bulky and complex in structure. For example, in the patent (patent numbers CN202220905518.X and CN202210697878.X) of a methanol hydrogen production fuel cell power generation system, methanol hydrogen production is used as fuel for fuel cells to convert chemical energy into electrical energy, which requires additional methanol hydrogen production devices. In the hydrogen production process, a large amount of heat is generated, and this heat is not utilized, resulting in energy consumption. This power generation method only uses one fuel cell to generate power, and the application of high-power fuel cells is limited, which makes the power generation capacity unable to fully meet the needs of distributed energy systems. In the patent (patent numbers CN201821591877.2 and CN201410407410.8) of a small distributed photovoltaic power generation system, solar and wind power generation components are used to convert solar and wind energy into electrical energy. However, this method relies heavily on natural energy and is limited by the region. In areas with little wind and sunlight, the investment cost is high and the power generation efficiency is low. In addition, the output current and voltage of wind energy are unstable, which can cause damage to the equipment at the load terminal. Moreover, this power generation method cannot be moved. In the patent (patent numbers CN201810254567.X and CN201821861827.1) of a small mobile natural gas distributed energy system, a gas turbine, a lithium bromide unit, and an electric power supply device are used to form a whole, which is strong in integrity and high in integration. However, it is bulky and complex in structure, and the overall maintenance cost is high, making it difficult to popularize in future small distributed and automobile power generation systems.

[0004] In order to meet the needs of miniaturization and intelligentization of future small distributed energy systems and future automobile power generation systems, and to realize efficient, safe and sustainable power supply, it is necessary to develop battery-power composite, multi-energy complementary, efficient and intelligent hybrid power generation systems. Proton exchange membrane fuel cells have the advantages of high energy conversion efficiency, no need for noble metal catalyst, strong fuel adaptability, low noise and less pollutant emission, and are considered as one of the most promising power generation methods. However, the application of high-power fuel cells is less, and a suitable power needs to be selected to complement the power generation together, and an internal combustion engine is a good power selection.

[0005] Through the above analysis, the problems and defects of the prior art are:

[0006] (1) Most of the existing distributed energy systems and power generation systems in heavy equipment are fuel cells alone or combined with other energy storage devices, which are bulky and complex in structure;

[0007] (2) The existing devices using solar and wind energy combination power generation have great dependence on natural energy and are limited by many regions, and the current and voltage are unstable, and the power generation device cannot be moved;

[0008] (3) The existing devices using gas turbine and other power supply equipment have high integrity and high integration, but they are bulky, complex in structure, and have high overall maintenance cost, and are difficult to popularize in future small distributed and automobile power generation systems. SUMMARY

[0009] In view of the above technical problems existing in the prior art of energy utilization, the present application provides a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking hydrogen production.

[0010] The present application is realized in that a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking hydrogen production comprises:

[0011] A cooling system, an ammonia hydrogen production system, an internal combustion engine system, a fuel cell system, an electricity storage system and a waste heat recovery system.

[0012] The ammonia hydrogen production system is connected with the internal combustion engine system, the ammonia hydrogen production system is connected with the fuel cell system, the cooling system is connected with the internal combustion engine system and the fuel cell system, the electricity storage system is connected with the internal combustion engine system and the fuel cell system, and the waste heat recovery system is connected with the internal combustion engine system, the ammonia hydrogen production system and the fuel cell system.

[0013] Further, the cooling system comprises a first heat exchanger and a water storage tank.

[0014] The first heat exchanger is connected with the internal combustion engine and the water storage tank to form an internal combustion engine cooling water circulation system, and the first heat exchanger is connected with the fuel cell and the water storage tank to form a fuel cell cooling water circulation system.

[0015] Further, the ammonia hydrogen production system comprises a liquid ammonia tank, a coil, an ammonia tank, a catalytic cracker, a separator, a purifier, and a hydrogen storage tank.

[0016] The liquid ammonia tank is connected with the coil through a liquid ammonia pipe, the coil is connected with the ammonia tank, the ammonia tank is connected with the catalytic cracker through a waste heat recovery system, the catalytic cracker is connected with the separator through the waste heat recovery system, the separator is connected with the purifier through the hydrogen storage tank, and the hydrogen storage tank is connected with the purifier.

[0017] Further, the internal combustion engine system comprises an internal combustion engine and a generator.

[0018] The internal combustion engine is connected with the hydrogen storage tank, and the generator is connected with the internal combustion engine.

[0019] Further, the fuel cell system comprises a fuel cell connected with the hydrogen storage tank.

[0020] Further, the power storage system comprises an electric coupler and an inverter.

[0021] The electric coupler is connected with the generator and the fuel cell, respectively, and the inverter is connected with the electric coupler at one end and with a user terminal at the other end.

[0022] Further, the waste heat recovery system comprises a second heat exchanger, a third heat exchanger, and a fourth heat exchanger.

[0023] The second heat exchanger and the third heat exchanger are connected, and the ammonia gas is delivered to the catalytic cracker after heat exchange, the mixed gas is delivered to the separator after heat exchange through the second heat exchanger, the high-temperature exhaust gas of the internal combustion engine is delivered to the fourth heat exchanger after heat exchange through the internal combustion engine exhaust pipe and the third heat exchanger, and the air is delivered to the fuel cell after heat exchange through the fourth heat exchanger.

[0024] In combination with the above technical solutions and the technical problems solved, the technical solutions to be protected by the present application have the following advantages and positive effects:

[0025] First, in view of the technical problems existing in the prior art and the difficulty in solving the problems, the technical solutions to be protected by the present application are analyzed in detail and deeply, and some creative technical effects brought about after solving the problems are analyzed. The specific description is as follows:

[0026] The application provides a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking hydrogen production.

[0027] The application provides a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking hydrogen production.

[0028] The high-temperature waste heat of the high-temperature mixed gas is utilized, and then the high-temperature mixed gas enters a separator and a purifier in sequence for separation and purification, so that hydrogen and nitrogen are obtained, wherein the hydrogen enters the anode of the fuel cell to provide the required fuel for the fuel cell, and the other part of the hydrogen enters the internal combustion engine to burn and expand to do work and drive the engine to generate electricity.

[0029] Air is used as the fuel of the cathode of the fuel cell and the fuel of the internal combustion engine, and a part of the reactant air directly enters the internal combustion engine to burn with hydrogen to do work, and the other part enters the fourth heat exchanger to exchange heat with the exhaust gas discharged from the internal combustion engine, so that the temperature of the inlet air of the cathode of the fuel cell reaches the requirement of the fuel cell.

[0030] Secondly, the technical scheme is regarded as a whole or from the perspective of a product, the technical scheme to be protected by the application has the technical effects and advantages described as follows:

[0031] The application provides a fuel cell and internal combustion engine hybrid power generation system based on hydrogen production by ammonia catalytic cracking.

[0032] Third, as the creative evidence of the invention claim, it is also reflected in the following important aspects:

[0033] (1) The expected income and commercial value of the technical solution of the application after transformation are:

[0034] The application fully utilizes the energy conversion to electric energy in the hybrid power generation system combining fuel cells and internal combustion engines, fully considers the efficient recycling of different grade waste heat, has higher energy utilization rate and power generation efficiency, is not limited by region, has great application prospect in the future, and has strong commercial value competitiveness.

[0035] (2) The technical solution of the application fills the technical gap in the industry at home and abroad:

[0036] At present, the power generation systems for distributed energy systems and heavy equipment and the like are mostly fuel cells alone or fuel cells combined with other energy storage devices, which are bulky, complex in structure, or use solar and wind energy combined power generation devices, which are highly dependent on natural energy and limited by region; the devices using gas turbines and other power supply equipment are bulky, complex in structure, and have high overall maintenance cost, and are difficult to popularize in the future small distributed and automobile power generation systems. The power generation capacity of the technical solution of the application can fully meet the needs of distributed energy systems and the like. The hybrid power generation system is not dependent on natural energy and can be mobile and not limited by region. At the same time, large components such as gas turbines are avoided, which has the advantages of fast start-up and response speed, simple and reliable structure, lower maintenance cost, and the like, has good application prospect in the field of distributed power generation, heavy equipment application field and the like, and has made technical progress.

[0037] (3) Whether the technical solution of the application overcomes the technical prejudice:

[0038] The technical scheme of the present application overcomes the technical prejudice that the internal combustion engine is only limited to the power of the automobile and the source of electric energy, combines the internal combustion engine as an additional power mechanical device with the fuel cell, fully converts mechanical energy and chemical energy into electric energy, better meets the needs of miniaturization and intelligentization of the future distributed energy generation system, realizes efficient, safe and sustainable electric energy supply, and is a battery-power combined, multi-energy complementary, efficient and intelligent hybrid power generation system. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a principle schematic diagram of the hybrid power generation system based on the ammonia catalytic cracking hydrogen fuel cell and the internal combustion engine provided by the embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the utilization of the multi-stream heat exchanger for the recovery and utilization of the mixed gas and the high-temperature tail gas waste heat of the internal combustion engine;

[0041] Figure 3 is a schematic diagram of the liquid ammonia gasification output cold energy of the hybrid power generation system based on the ammonia catalytic cracking hydrogen fuel cell and the internal combustion engine provided by the embodiment of the present application.

[0042] In the figure: 1, liquid ammonia tank; 2, coil pipe; 3, ammonia gas tank; 4, first valve; 5, first heat exchanger; 6, second heat exchanger; 7, third heat exchanger; 8, catalytic cracker; 9, separator; 10, purifier; 11, water storage tank; 12, internal combustion engine; 13, second valve; 14, hydrogen storage tank; 15, generator; 16, fuel cell; 17, fourth valve; 18, third valve; 19, fourth heat exchanger; 20, electric coupler; 21, inverter; 22, user end; 23, valve 5; 24, valve 6. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0044] In order to enable those skilled in the art to fully understand how the present application is specifically implemented, this part is an explanatory embodiment for explaining and describing the technical scheme of the claims.

[0045] As Figure 1As shown, the embodiment of the present application provides a fuel cell and internal combustion engine hybrid power generation system based on ammonia catalytic cracking for hydrogen production. Liquid ammonia stored in the liquid ammonia tank 1 enters the coil pipe 2 through the liquid ammonia pipe, and the heat in the air is used to gasify the liquid ammonia into ammonia gas without consuming energy. The ammonia gas is stored in the ammonia gas tank 3 through the ammonia gas pipeline, and can be temporarily stored in the ammonia gas tank. There is a valve 1 for controlling the flow of ammonia gas in the ammonia gas pipeline connected to the first heat exchanger. The valve 1 controls the opening and closing of the entire hybrid power generation system. The ammonia gas enters the three heat exchangers in turn through the ammonia gas pipeline to increase the sensible heat and latent heat of the ammonia gas. The first heat exchanger is connected to the cooling system of the internal combustion engine and the fuel cell, including the internal combustion engine cooling water circulation system and the fuel cell cooling water circulation system. Both circulation systems are connected to the water storage tank 11, and the first heat exchanger is used to heat the ammonia gas. The valves 5 and 6 control the flow of cooling water of the fuel cell and the internal combustion engine, respectively. The heated ammonia gas enters the second heat exchanger and the third heat exchanger in turn, and the heat exchange between the ammonia gas and the catalytic cracking high-temperature tail gas (the temperature of the catalytic cracking tail gas is about 480°C) is realized through the second heat exchanger. The heat exchange between the ammonia gas and the high-temperature tail gas of the internal combustion engine (the temperature of the tail gas of the internal combustion engine is about 500-600°C) is realized through the third heat exchanger, realizing the recycling of waste heat. The ammonia gas further enters the catalytic cracker 8 and is cracked under the action of the catalyst. The mixed gas after catalytic cracking is introduced into the second heat exchanger again, and then enters the mixed gas separator 9 through the mixed gas pipeline after being cooled. The mixed gas includes nitrogen and hydrogen. After being separated by the separator, the nitrogen is discharged into the atmosphere, and the hydrogen enters the purifier 10 to be purified, and then enters the hydrogen storage tank 14 through the hydrogen pipeline. The separated hydrogen is used as fuel for the internal combustion engine 12 and the fuel cell 16, and enters the internal combustion engine 12 and the fuel cell 16 through the internal combustion engine fuel supply pipe and the fuel cell fuel supply pipe. There is a second valve and a third valve on each of the two supply pipelines to control the flow of hydrogen.

[0046] The fuel inlet 1 of the internal combustion engine is connected to the outlet 1 of the hydrogen storage tank, the fuel inlet 2 of the internal combustion engine is connected to the exhaust port of the fuel cell, the fuel inlet 1 of the fuel cell is connected to the outlet 2 of the hydrogen storage tank, and the fuel inlet 2 of the fuel cell is connected to the preheated air. The exhaust gas of the internal combustion engine 12 exchanges heat with the ammonia through a three-stage heat exchanger, and the further exhaust gas exchanges heat with the air through a fourth heat exchanger to preheat the air entering the fuel cell 16, and the exhaust gas is finally discharged into the air. The fourth valve controls the air flow entering the fuel cell 16, and the preheated air enters the cathode of the fuel cell 16 and reacts with the anode gas hydrogen of the fuel cell to generate heat and output direct current. The generated heat heats the ammonia through the fuel cell cooling circulating water system, and the output direct current is converted into direct current through the DC / DC electric coupler 20. The high-temperature hydrogen and air that are not completely reacted in the anode of the fuel cell enter the internal combustion engine to preheat the cylinder of the internal combustion engine, and the mechanical energy is output through the generator 15 to convert into alternating current, which is further converted into direct current through the AC / DC electric coupler 20, and finally the direct current is converted into alternating current for the user end 22 through the inverter 21.

[0047] Air is used as the cathode of the fuel cell and the fuel of the internal combustion engine. Part of the reactant air directly enters the internal combustion engine to burn with hydrogen and do work, and part of the reactant air exchanges heat with the fourth heat exchanger to make the temperature of the air entering the cathode of the fuel cell reach the requirement of the fuel cell. The ammonia catalytic cracking hydrogen fuel cell and internal combustion engine hybrid power generation system uses the waste heat of the internal combustion engine and the fuel cell to heat the ammonia, reducing the demand for cooling liquid of the internal combustion engine and the fuel cell and reducing consumption. At the same time, the heat of the catalytic reforming tail gas and the high-temperature tail gas of the internal combustion engine is used to heat the ammonia, realizing the full utilization of energy and providing the fuel required for the reaction of the fuel cell and the internal combustion engine. At the same time, the structure eliminates the external reformer, reducing the overall size of the system. Moreover, the anode tail gas of the fuel cell enters the internal combustion engine to burn and expand to do work, driving the generator to generate electricity and improving the fuel utilization rate. Among them, the valves 2, 3 and 4 used on the fuel supply pipeline are solenoid valves, which can accurately control the flow of fuel and reduce errors to a certain extent. At the same time, the inner surface of the ammonia cracker is coated with an ammonia catalytic cracking hydrogen catalyst, so that reactions can occur in the container to generate hydrogen and nitrogen by cracking ammonia. In this system, the efficient recovery and utilization of different grade waste heat are fully considered, including the heat of low-grade cooling water, the heat of mixed gas of medium and high grade, and the heat of high-temperature tail gas of the internal combustion engine.

[0048] As Figure 2As shown, the hydrogen fuel cell and internal combustion engine hybrid power generation system provided by the embodiment of the present application can change the heat exchanger in the waste heat recovery system into a multi-stream heat exchanger to recover the waste heat of the mixed gas and the high-temperature exhaust gas of the internal combustion engine.

[0049] As shown, Figure 3 As shown, the hydrogen fuel cell and internal combustion engine hybrid power generation system provided by the embodiment of the present application can recover the cold energy released by the gasification of the liquid nitrogen in the ammonia hydrogen production system.

[0050] The hydrogen fuel cell and internal combustion engine hybrid power generation system provided by the embodiment of the present application further comprises a temperature sensor for detecting the temperature of the internal combustion engine, which can ensure the normal operation of the cooling system of the internal combustion engine and the smooth progress of the ammonia catalytic cracking.

[0051] The hydrogen fuel cell and internal combustion engine hybrid power generation system provided by the embodiment of the present application is based on the ammonia catalytic cracking hydrogen production, and the working principle is to combine the fuel cell with the internal combustion engine to develop a fuel cell-internal combustion engine hybrid power generation system.

[0052] The specific working principle is: liquid ammonia in the liquid ammonia tank (1) through the liquid ammonia pipe into the coil (2), using the heat of air to make the liquid ammonia gasification into ammonia gas, ammonia gas through the ammonia gas pipeline to ammonia tank (3), in the ammonia gas tank and 1 level heat exchanger (5) communication ammonia gas pipeline exists a valve 1 (4) through the control of ammonia gas flow, the valve 1 controls the opening and closing of the whole hybrid power generation system. Ammonia gas through the ammonia gas pipeline into three heat exchangers in turn, to realize the increase of ammonia gas sensible heat and latent heat, 1 level heat exchanger and the cooling system of internal combustion engine and fuel cell are connected, including the internal combustion engine cooling water circulation system and fuel cell cooling water circulation system, two circulation systems are connected into the water storage tank (11), through the 1 level heat exchanger to realize the first heating of ammonia gas, wherein, valve 5 (23), valve 6 (24) control the cooling circulation water flow of fuel cell and internal combustion engine respectively. The ammonia gas after heating enters into 2 level heat exchanger (6) and 3 level heat exchanger (7) in turn, through 2 level heat exchanger to realize the heat exchange between ammonia gas and catalytic cracking high temperature tail gas, through 3 level heat exchanger and the heat exchange of internal combustion engine high temperature tail gas, realize the recycling of waste heat, further ammonia gas into the catalytic cracker (8), under the action of catalyst, the mixed gas after catalytic cracking is again connected into 2 level heat exchanger, after cooling through the mixed gas pipeline into the mixed gas separator (9), wherein, the mixed gas includes nitrogen and hydrogen. After separation by the separator, the nitrogen is discharged into the atmosphere, the hydrogen enters the purifier (10) to realize purification, further through the hydrogen pipeline into the hydrogen storage tank (14). The separated hydrogen as the fuel of internal combustion engine (12) and fuel cell (16) respectively through the internal combustion engine fuel supply pipe and fuel cell fuel supply pipe into the internal combustion engine and fuel cell, on the two supply pipelines, each has a regulating valve to control the flow of hydrogen, namely the second valve (13) and the third valve (18).

[0053] The fuel inlet 1 of the internal combustion engine is connected with the outlet 1 of the hydrogen storage tank, the fuel inlet 2 of the internal combustion engine is connected with the exhaust port of the fuel cell, the fuel inlet 1 of the fuel cell is connected with the outlet 2 of the hydrogen storage tank, and the fuel inlet 2 of the fuel cell is connected with the preheated air. The exhaust gas of the internal combustion engine exchanges heat with ammonia through the third heat exchanger, and then the further exhaust gas exchanges heat with air through the fourth heat exchanger (19) to realize preheating of the air entering the fuel cell 16, and the exhaust gas is finally discharged into the air. The fourth valve (17) controls the air flow entering the fuel cell 16, and after the preheated air enters the cathode of the fuel cell (16), it reacts with the hydrogen gas of the anode of the fuel cell to generate heat and output direct current, the generated heat heats the ammonia through the fuel cell cooling circulating water system in the first stage, and the output direct current is converted into direct current through the DC / DC electric coupler 20. The high-temperature hydrogen gas and air that are not completely reacted in the anode of the fuel cell enter the internal combustion engine to realize preheating of the cylinder of the internal combustion engine, and at the same time, the combustion expands to do work, and the output mechanical energy is converted into alternating current through the generator (15), and then the alternating current is converted into direct current through the AC / DC electric coupler (20), and finally the direct current is converted into alternating current for the user end (22) through the inverter (21).

[0054] In order to prove the creativity and technical value of the technical scheme of the application, this part is an application example of the technical scheme of the claim on a specific product or related technology.

[0055] The fuel cell-internal combustion engine hybrid power generation system provided by the application can be applied to power supply of small distributed energy systems and heavy equipment systems. For example, in residential areas, data centers, barracks, and heavy equipment for vehicles, the fuel cell and the internal combustion engine are combined, the chemical energy of hydrogen in the fuel cell is converted into electrical energy, the chemical energy of hydrogen in the internal combustion engine is converted into mechanical energy, both devices have stable and efficient energy conversion efficiency, and further use of the generator converts the mechanical energy into electrical energy, both kinds of electrical energy are converted into electrical energy for equipment use through the inverter, and the whole hybrid power generation process is completed.

[0056] The embodiment of the application has achieved some positive effects in the research and development or use process, and indeed has great advantages compared with the prior art. The following content is described in combination with experimental data, graphs and the like.

[0057] The fuel cell used in the application has been widely applied in the automobile industry, the shipbuilding industry, the aerospace industry, energy power generation and other fields, has the advantages of high energy conversion rate, no noble metal as catalyst, strong fuel adaptability, low noise, less pollutant emission, and is considered as one of the most promising power generation methods. The invention and application of internal combustion engine have undergone a long historical test, greatly promoted the mechanization process, and can stably provide power mechanical energy. In the application, the cooling water heat of the fuel cell and the internal combustion engine is recycled and utilized, and the high temperature of the exhaust gas of the internal combustion engine and the mixed gas after catalytic cracking is further utilized to heat the ammonia before cracking, so that the combined hybrid power generation system has high power generation efficiency and high energy utilization rate.

[0058] It should be noted that the embodiments of the present application can be realized by hardware, software or a combination of software and hardware. The hardware part can be realized by special logic; the software part can be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or a specially designed hardware. Those skilled in the art can understand that the above-mentioned devices and methods can be realized by computer executable instructions and / or included in processor control code, such as provided on a carrier medium, such as a magnetic disk, CD or DVD-ROM, a programmable memory, such as a read-only memory (firmware), or a data carrier, such as an optical or electronic signal carrier. The devices and modules of the present application can be realized by hardware circuit, such as ultra-large scale integrated circuit or gate array, semiconductor, such as logic chip, transistor, or programmable hardware device, such as field programmable gate array, programmable logic device, or software executed by various types of processors, or a combination of the above-mentioned hardware circuit and software, such as firmware.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any modification, equivalent replacement and improvement made by those skilled in the art within the technical range disclosed by the present application, within the spirit and principle of the present application, should be covered within the protection scope of the present application.

Claims

1. A fuel cell and internal combustion engine hybrid power generation system based on hydrogen production by catalytic decomposition of ammonia, characterized by, It comprises: a cooling system, an ammonia hydrogen production system, an internal combustion engine system, a fuel cell system, an electricity storage system, and a waste heat recovery system; the ammonia hydrogen production system is connected to the internal combustion engine system, and the ammonia hydrogen production system is connected to the fuel cell system, the cooling system is connected to the internal combustion engine system and the fuel cell system, the electricity storage system is connected to the internal combustion engine system and the fuel cell system, and the waste heat recovery system is connected to the internal combustion engine system, the ammonia hydrogen production system and the fuel cell system; the cooling system comprises: a first heat exchanger and a water storage tank; the first heat exchanger is connected to the internal combustion engine and the water storage tank to form an internal combustion engine cooling water circulation system, and the first heat exchanger is connected to the fuel cell and the water storage tank to form a fuel cell cooling water circulation system; the ammonia hydrogen production system comprises: a liquid ammonia tank, a coil, an ammonia gas tank, a catalytic cracker, a separator, a purifier, and a hydrogen storage tank; the liquid ammonia tank is connected to the coil through a liquid ammonia pipe, the coil is connected to the ammonia gas tank, the ammonia gas tank is connected to the catalytic cracker through the waste heat recovery system, the catalytic cracker is connected to the separator through the waste heat recovery system, the separator is connected to the purifier through the hydrogen storage tank, and the hydrogen storage tank is connected to the purifier; the waste heat recovery system comprises: a second heat exchanger, a third heat exchanger, and a fourth heat exchanger; the second heat exchanger and the third heat exchanger are connected, the ammonia gas is delivered to the catalytic cracker after heat exchange, the mixed gas after catalytic cracking is delivered to the separator after heat exchange by the second heat exchanger, the high-temperature exhaust gas of the internal combustion engine is delivered to the fourth heat exchanger after heat exchange by the third heat exchanger through the internal combustion engine exhaust pipe, and the air is delivered to the fuel cell after heat exchange by the fourth heat exchanger.

2. The fuel cell hybrid power generation system based on hydrogen production by ammonia catalytic cracking according to claim 1, characterized by The internal combustion engine system comprises an internal combustion engine and a generator. The internal combustion engine is connected to the hydrogen storage tank, and the generator is connected to the internal combustion engine.

3. The fuel cell hybrid power system based on ammonia catalytic decomposition for hydrogen production according to claim 1, wherein The fuel cell system comprises a fuel cell connected to the hydrogen storage tank.

4. The fuel cell hybrid power system based on ammonia catalytic decomposition for hydrogen production according to claim 1, wherein The electricity storage system comprises an electric coupler and an inverter. The electric coupler is connected to the generator and the fuel cell, and the inverter is connected to the electric coupler and the user end.

5. The fuel cell hybrid power system based on ammonia catalytic decomposition for hydrogen production according to claim 1, wherein, The separated hydrogen gas is used as fuel for the internal combustion engine and the fuel cell, and is delivered to the internal combustion engine and the fuel cell through the internal combustion engine fuel supply pipe and the fuel cell fuel supply pipe, respectively. There is an adjusting valve for controlling the flow of hydrogen gas on each of the two supply pipes.

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