Photovoltaic coupled molten carbonate fuel cell cooling, heating and power system and energy supply method

Abstract

The present invention discloses a photovoltaic coupled molten carbonate fuel cell cold, hot and electric system and a power supply method. By coupling a photovoltaic power generation system, a gas system, a molten carbonate fuel cell power generation system and a refrigeration and heating system, renewable energy can be effectively utilized to realize power supply, cooling and heating, while improving the utilization mode and application field of molten carbonate fuel cells.

Description

Technical Field

[0001] The invention belongs to the technical field of cold and heat power systems and fuel cells, and in particular relates to a photovoltaic coupled molten carbonate fuel cell cold and heat power system and an energy supply method. Background Art

[0002] Molten carbonate fuel cells are a clean and efficient high-temperature power generation device with a wide range of fuel sources. They can be combined with gas turbines and renewable energy to form a combined power generation system. In addition, the exhaust temperature of fuel cells is high, which can provide cooling and heating. At present, molten carbonate fuel cells in China are in the application and promotion stage, and the level of system integration needs to be improved. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a photovoltaic coupled molten carbonate fuel cell heat and cold power system and energy supply method. By coupling a photovoltaic power generation system, a gas system, a molten carbonate fuel cell power generation system, and a refrigeration and heating system, renewable energy can be effectively utilized to achieve power supply, cooling, and heating, while improving the utilization methods and application fields of molten carbonate fuel cells.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the photovoltaic coupled molten carbonate fuel cell heat and cold power system includes a photovoltaic power generation system, a molten carbonate fuel cell system and a cooling and heating system. The photovoltaic power generation system is connected to the molten carbonate fuel cell system through a gas system. The gas system is used to provide the molten carbonate fuel cell system with the gas required for the reaction, and the molten carbonate fuel cell system is used to supply power to users; the tail gas output end on the anode side of the molten carbonate fuel cell system is connected to the catalytic combustion system, the tail gas outlet of the catalytic combustion system is connected to the gas separation system, and the energy supply outlet of the catalytic combustion system is connected to the cooling and heating system, which is used to introduce the waste heat of the gas generated by the catalytic combustion into the cooling and heating system to provide cooling and heating for users; the tail gas output end on the cathode side of the molten carbonate fuel cell system is connected to the gas separation system, the tail gas outlet of the gas separation system is connected to the cooling and heating system, and the cooling and heating system is used to provide cooling and heating for users.

[0005] Furthermore, the gas system includes an energy storage system and a hydrogen production system. The photovoltaic power generation system is connected to the energy storage system. The energy storage system is used to store the electrical energy generated by the photovoltaic power generation system. The output end of the energy storage system is connected to the hydrogen production system to provide electrical energy for the hydrogen production system. The hydrogen production system is used to produce hydrogen and oxygen by electrolysis, and the hydrogen production system is provided with a hydrogen outlet and an oxygen outlet. The hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and the oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system.

[0006] Furthermore, the oxygen outlet of the hydrogen production system is also connected to a catalytic combustion system for introducing oxygen into the catalytic combustion system for catalytic combustion reaction with unreacted hydrogen in the anode side tail gas of the molten carbonate fuel cell system.

[0007] Furthermore, the gas separation system is provided with a circulating gas outlet, which is connected to the cathode side of the molten carbonate fuel cell system and is used to pass the separated recyclable gas into the cathode side of the molten carbonate fuel cell system for a circulating reaction.

[0008] Furthermore, the tail gas outlet of the gas separation system is connected to a refrigeration and heating system for passing the separated excess gas and possible hydrogen gas into the refrigeration and heating system.

[0009] Furthermore, nitrogen or carbon dioxide is introduced into the anode side of the molten carbonate fuel cell system to prevent the temperature from being too high during the fuel cell power generation process.

[0010] Furthermore, the operating temperature of the molten carbonate fuel cell system is 650° C., and the energy storage system electrically heats the molten carbonate fuel cell system.

[0011] Furthermore, the molten carbonate fuel cell is a high temperature fuel cell or a proton exchange membrane fuel cell.

[0012] The present invention also provides an energy supply method for the above-mentioned cold and hot power system, wherein the photovoltaic power generation system is connected to the gas system, the gas system is connected to the molten carbonate fuel cell power generation system, the gas system includes an energy storage system and a hydrogen production system, the photovoltaic power generation system is connected to the energy storage system, and the output end of the energy storage system is connected to the hydrogen production system; the hydrogen production system produces hydrogen and oxygen by electrolysis, and the hydrogen production system is provided with a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and nitrogen or carbon dioxide is introduced into the anode side of the molten carbonate fuel cell system; the oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system and the catalytic combustion system, and carbon dioxide gas is introduced into the cathode side of the molten carbonate fuel cell system, and the molten carbonate fuel cell system performs reaction to generate electricity to provide electric energy for users; the molten carbonate fuel cell system The anode side tail gas generated during the power generation process is introduced into the catalytic combustion system for catalytic combustion, and the mixed gas after catalytic combustion is introduced into the gas separation system. The energy supply outlet of the catalytic combustion system is connected to the refrigeration and heating system, and the waste heat of the gas generated by the catalytic combustion is introduced into the refrigeration and heating system to provide cooling and heating for users; the cathode side tail gas generated during the power generation process of the molten carbonate fuel cell system is introduced into the gas separation system, and the gas separation system separates the introduced gas, and the separated carbon dioxide and oxygen that does not participate in the reaction are introduced into the cathode side of the molten carbonate fuel cell system through the circulating gas outlet provided in the gas separation system for circulation reaction; the tail gas outlet of the gas separation system is connected to the refrigeration and heating system, and part of the excess gas and possible hydrogen gas are introduced into the refrigeration and heating system, and cooling and heating are provided for users through the heat exchange refrigeration device.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] The present invention converts photovoltaic power generation into hydrogen energy and utilizes it through the combination of photovoltaic power generation, hydrogen production and fuel cells, thereby solving the problem of local consumption of photovoltaic power generation, improving the utilization rate of abandoned light, and providing users with three forms of energy: cold, heat and electricity.

[0015] The present invention utilizes the combination of molten carbonate fuel cells and photovoltaic renewable energy to generate electricity efficiently, thereby improving the utilization method and application field of the molten carbonate fuel cell system.

[0016] The present invention processes the high-temperature exhaust gas generated by the molten carbonate fuel cell system after power generation, and then passes it into a refrigeration and heating system, and provides cooling and heating for users through a heat exchange refrigeration device, thereby realizing the secondary utilization of the high-temperature exhaust gas, reducing the emission of the high-temperature exhaust gas into the air, and making full use of energy.

[0017] The present invention passes the tail gas of the molten carbonate fuel cell system into a gas separation system, the separated carbon dioxide gas is passed into the cathode side of the molten carbonate fuel cell system for circulation reaction, and the remaining tail gas is passed into a refrigeration and heating system to provide users with cold and hot energy, thereby realizing the recycling of carbon dioxide, reducing carbon dioxide emissions, and obtaining a green and environmentally friendly energy supply method. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a photovoltaic coupled molten carbonate fuel cell heat and cold power system. DETAILED DESCRIPTION

[0019] The photovoltaic coupled molten carbonate fuel cell heat and cold power system provided by the present invention includes a photovoltaic power generation system, a molten carbonate fuel cell system and a cooling and heating system. The photovoltaic power generation system is connected to the molten carbonate fuel cell system through a gas system. The gas system is used to provide the molten carbonate fuel cell system with the gas required for the reaction. The molten carbonate fuel cell system is used to supply power to users; the tail gas output end on the anode side of the molten carbonate fuel cell system is connected to the catalytic combustion system, the tail gas outlet of the catalytic combustion system is connected to the gas separation system, and the energy supply outlet of the catalytic combustion system is connected to the cooling and heating system, which is used to introduce the gas waste heat generated by the catalytic combustion into the cooling and heating system to provide cooling and heating for users; the tail gas output end on the cathode side of the molten carbonate fuel cell system is connected to the gas separation system, the tail gas outlet of the gas separation system is connected to the cooling and heating system, and the cooling and heating system is used to provide cooling and heating for users.

[0020] Furthermore, the gas system includes an energy storage system and a hydrogen production system, the photovoltaic power generation system is connected to the energy storage system, the energy storage system is used to store the electrical energy generated by the photovoltaic power generation system, and the output end of the energy storage system is connected to the hydrogen production system to provide electrical energy for the hydrogen production system; the hydrogen production system is used to produce hydrogen and oxygen by electrolysis, and the hydrogen production system is provided with a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and the oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system; the oxygen outlet of the hydrogen production system is also connected to a catalytic combustion system, which is used to pass oxygen into the catalytic combustion system and the hydrogen that does not participate in the reaction in the tail gas on the anode side of the molten carbonate fuel cell system for catalytic combustion reaction.

[0021] Furthermore, the gas separation system is also provided with a circulating gas outlet, which is connected to the cathode side of the molten carbonate fuel cell system and is used to pass the separated recyclable gas into the cathode side of the molten carbonate fuel cell system for a circulating reaction; the recyclable gas is the carbon dioxide separated by the gas separation system and the oxygen that does not participate in the reaction.

[0022] Furthermore, nitrogen or carbon dioxide is introduced into the anode side of the molten carbonate fuel cell system to prevent the temperature from being too high during the fuel cell power generation process; the operating temperature of the molten carbonate fuel cell system is 650°C, and the energy storage system electrically heats the molten carbonate fuel cell system; the molten carbonate fuel cell is a high-temperature fuel cell or a proton exchange membrane fuel cell.

[0023] The present invention also provides an energy supply method for the above-mentioned cold and hot power system, wherein the photovoltaic power generation system is connected to the gas system, the gas system is connected to the molten carbonate fuel cell power generation system, the gas system includes an energy storage system and a hydrogen production system, the photovoltaic power generation system is connected to the energy storage system, and the output end of the energy storage system is connected to the hydrogen production system; the hydrogen production system produces hydrogen and oxygen by electrolysis, and the hydrogen production system is provided with a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and nitrogen or carbon dioxide is introduced into the anode side of the molten carbonate fuel cell system; the oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system and the catalytic combustion system, and carbon dioxide gas is introduced into the cathode side of the molten carbonate fuel cell system, and the molten carbonate fuel cell system performs reaction to generate electricity to provide electric energy for users; the molten carbonate fuel cell system The anode side tail gas generated during the power generation process is introduced into the catalytic combustion system for catalytic combustion, and the mixed gas after catalytic combustion is introduced into the gas separation system. The energy supply outlet of the catalytic combustion system is connected to the refrigeration and heating system, and the waste heat of the gas generated by the catalytic combustion is introduced into the refrigeration and heating system to provide cooling and heating for users; the cathode side tail gas generated during the power generation process of the molten carbonate fuel cell system is introduced into the gas separation system, and the gas separation system separates the introduced gas, and the separated carbon dioxide and oxygen that does not participate in the reaction are introduced into the cathode side of the molten carbonate fuel cell system through the circulating gas outlet provided in the gas separation system for circulation reaction; the tail gas outlet of the gas separation system is connected to the refrigeration and heating system, and part of the excess gas and possible hydrogen gas are introduced into the refrigeration and heating system, and cooling and heating are provided for users through the heat exchange refrigeration device.

[0024] The present invention is described in detail below in conjunction with the accompanying drawings. A photovoltaic solar power generation system is connected to a gas system, which is connected to a molten carbonate fuel cell power generation system. The gas system includes an energy storage system and a hydrogen production system. The photovoltaic power generation system is connected to the energy storage system, and the output end of the energy storage system is connected to the hydrogen production system. The hydrogen production system produces hydrogen and oxygen by electrolysis. The hydrogen production system is provided with a hydrogen outlet and an oxygen outlet. The hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and hydrogen is introduced into the anode side of the battery system. To prevent excessive temperature during fuel cell power generation, nitrogen or carbon dioxide is connected to the anode side of the battery system. The oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system and the catalytic combustion system, and oxygen is introduced into the cathode side of the battery system and the catalytic combustion system. An exogenous carbon dioxide gas is also introduced into the cathode side of the battery system. The molten carbonate fuel cell system generates electricity through reaction to provide electric energy for users. The molten carbonate fuel cell system The anode side tail gas generated during the power generation process of the system is introduced into the catalytic combustion system, and the hydrogen participating in the reaction in the anode tail gas reacts with the introduced oxygen for catalytic combustion. The mixed gas obtained after catalytic combustion enters the gas separation system through the tail gas outlet of the catalytic combustion system. The energy supply outlet of the catalytic combustion system is connected to the refrigeration and heating system, and the waste heat of the gas generated by the catalytic combustion is introduced into the refrigeration and heating system to provide cooling and heating for users; the cathode side tail gas generated during the power generation process of the molten carbonate fuel cell system is introduced into the gas separation system, and the gas separation system separates the introduced gas, and the separated carbon dioxide and oxygen that do not participate in the reaction are introduced into the cathode side of the molten carbonate fuel cell system through the circulating gas outlet provided in the gas separation system for circulating reaction; the tail gas outlet of the gas separation system is connected to the refrigeration and heating system, and part of the excess gas and possible hydrogen gas are introduced into the refrigeration and heating system, and cooling and heating are provided for users through the heat exchange refrigeration device.

Claims

1. Photovoltaic coupled molten carbonate fuel cell heat and cold power system, characterized in that: It includes a photovoltaic power generation system, a molten carbonate fuel cell system and a cooling and heating system. The photovoltaic power generation system is connected to the molten carbonate fuel cell system through a gas system. The gas system is used to provide the molten carbonate fuel cell system with the gas required for the reaction, and the molten carbonate fuel cell system is used to supply power to users; the tail gas output end on the anode side of the molten carbonate fuel cell system is connected to a catalytic combustion system, the tail gas outlet of the catalytic combustion system is connected to a gas separation system, and the energy supply outlet of the catalytic combustion system is connected to a cooling and heating system, which is used to introduce the waste heat of the gas generated by the catalytic combustion into the cooling and heating system to provide cooling and heating for users; the tail gas output end on the cathode side of the molten carbonate fuel cell system is connected to a gas separation system, the tail gas outlet of the gas separation system is connected to a cooling and heating system, and the cooling and heating system is used to provide cooling and heating for users; The gas system includes an energy storage system and a hydrogen production system, the photovoltaic power generation system is connected to the energy storage system, the energy storage system is used to store the electrical energy generated by the photovoltaic power generation system, and the output end of the energy storage system is connected to the hydrogen production system to provide electrical energy for the hydrogen production system; the hydrogen production system is used to produce hydrogen and oxygen by electrolysis, and the hydrogen production system is provided with a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and the oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system; The gas separation system is provided with a circulating gas outlet, which is connected to the cathode side of the molten carbonate fuel cell system and is used to pass the separated recyclable gas into the cathode side of the molten carbonate fuel cell system for a circulating reaction.

2. The photovoltaic coupled molten carbonate fuel cell heat and cold power system according to claim 1, characterized in that: The oxygen outlet of the hydrogen production system is also connected to a catalytic combustion system for introducing oxygen into the catalytic combustion system for catalytic combustion reaction with unreacted hydrogen in the anode side tail gas of the molten carbonate fuel cell system.

3. The photovoltaic coupled molten carbonate fuel cell heat and cold power system according to claim 1, characterized in that: The recyclable gas is the carbon dioxide separated by the gas separation system and the oxygen that does not participate in the reaction.

4. The photovoltaic coupled molten carbonate fuel cell heat and cold power system according to claim 1, characterized in that: Nitrogen or carbon dioxide is introduced into the anode side of the molten carbonate fuel cell system to prevent the temperature from being too high during the power generation process of the fuel cell.

5. The photovoltaic coupled molten carbonate fuel cell heat and cold power system according to claim 1, characterized in that: The operating temperature of the molten carbonate fuel cell system is 650° C., and the energy storage system electrically heats the molten carbonate fuel cell system.

6. The photovoltaic coupled molten carbonate fuel cell heat and cold power system according to claim 1, characterized in that: The molten carbonate fuel cell is a high temperature fuel cell or a proton exchange membrane fuel cell.

7. The energy supply method of the photovoltaic coupled molten carbonate fuel cell cold and heat power system according to any one of claims 1 to 6, characterized in that: The photovoltaic power generation system is connected to the gas system, and the gas system is connected to the molten carbonate fuel cell power generation system. The gas system includes an energy storage system and a hydrogen production system. The photovoltaic power generation system is connected to the energy storage system, and the output end of the energy storage system is connected to the hydrogen production system; the hydrogen production system produces hydrogen and oxygen by electrolysis, and the hydrogen production system is provided with a hydrogen outlet and an oxygen outlet, the hydrogen outlet is connected to the anode side of the molten carbonate fuel cell system, and nitrogen or carbon dioxide is introduced into the anode side of the molten carbonate fuel cell system; the oxygen outlet is connected to the cathode side of the molten carbonate fuel cell system and the catalytic combustion system, and carbon dioxide gas is introduced into the cathode side of the molten carbonate fuel cell system, and the molten carbonate fuel cell system reacts to generate electricity to provide electricity to users; the molten carbonate fuel cell system generates electricity through The anode side tail gas generated during the power generation process is introduced into the catalytic combustion system for catalytic combustion, and the mixed gas after catalytic combustion is introduced into the gas separation system. The energy supply outlet of the catalytic combustion system is connected to the refrigeration and heating system, and the waste heat of the gas generated by the catalytic combustion is introduced into the refrigeration and heating system to provide cooling and heating for users; the cathode side tail gas generated during the power generation process of the molten carbonate fuel cell system is introduced into the gas separation system, and the gas separation system separates the introduced gas, and the separated carbon dioxide and oxygen that does not participate in the reaction are introduced into the cathode side of the molten carbonate fuel cell system through the circulating gas outlet provided in the gas separation system for circulation reaction; the tail gas outlet of the gas separation system is connected to the refrigeration and heating system, and part of the excess gas and possible hydrogen gas are introduced into the refrigeration and heating system, and cooling and heating are provided for users through a heat exchange refrigeration device.

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