Aluminum-fired power generation system and working method thereof

Abstract

The present invention discloses an aluminum-burning power generation system and a working method thereof, wherein the system comprises an aluminum combustion power generation subsystem and an aluminum fuel electrolysis regeneration subsystem; the present invention effectively couples aluminum fuel-based energy storage, aluminum combustion power generation, hydrogen combustion power generation and aluminum oxide electrolysis to produce aluminum, thereby having the advantages of high energy storage density, long energy storage cycle to achieve permanent storage, fuel recycling regeneration without consumption and convenience for global energy trade.

Description

Technical Field

[0001] The present invention belongs to the technical field of green power generation and advanced energy storage, and in particular relates to a power generation system burning aluminum and a working method thereof. Background Art

[0002] As global air pollution and climate warming become increasingly severe, traditional power generation systems based on fossil energy will face unprecedented pressure and challenges. From a global perspective, countries are working hard to increase the proportion of renewable energy generation in their power structure. In the future, the development trend of the world's energy sector will inevitably be the gradual replacement of fossil energy by renewable energy. However, due to its own intermittent, unstable and uncertain characteristics, renewable energy has seriously hindered the development of renewable energy power generation. In the future, to achieve the replacement of fossil energy by renewable energy, it is necessary to rely on the development and support of large-scale and long-cycle energy storage technology.

[0003] At present, research in the field of energy storage technology is very active, and various energy storage technologies are developing rapidly, such as pumped storage, compressed air storage, lithium battery storage, supercapacitor storage, flywheel storage, hydrogen storage, etc. However, existing energy storage technologies are difficult to simultaneously meet the requirements of high energy storage density, mobility, low self-consumption loss and global energy trade. Therefore, it is necessary to develop a new energy storage technology to enable renewable energy generation to develop in a deeper and wider direction worldwide. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide an aluminum-fired power generation system and a working method thereof. The system effectively couples aluminum fuel energy storage, aluminum combustion power generation, hydrogen combustion power generation and aluminum oxide electrolysis, and has the advantages of high energy storage density, long energy storage cycle to achieve permanent storage, fuel recycling and regeneration without consumption, and convenience for global energy trade.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] An aluminum-burning power generation system comprises an aluminum combustion power generation subsystem and an aluminum fuel electrolysis regeneration subsystem;

[0007] The aluminum combustion power generation subsystem includes a powder making device 1, an aluminum liquid combustion device 2, a gas-solid separation device 3, a mixed working medium turbine 4, a generator 5, a hydrogen combustion device 6, an air compressor 7, a steam turbine 8, a generator 9 and a condenser 10; the aluminum fuel is connected to the material inlet of the powder making device 1 through a conveying pipeline, the outlet of the powder making device 1 is connected to the fuel inlet of the aluminum liquid combustion device 2, and the oxidant inlet of the aluminum liquid combustion device 2 is connected to the oxidant water conveying pipeline. In the aluminum liquid combustion device 2, aluminum powder and water undergo a violent combustion reaction, and the reaction equation is 2Al+3H2O=Al2O3+3H2. During the reaction, the oxidant water is excessive, and the reaction products are solid Al2O3, steam and hydrogen; the outlet of the aluminum liquid combustion device 2 is connected to the inlet of the gas-solid separation device 3. After the gas-solid separation is completed, the mixed gas of steam and hydrogen is connected to the mixed gas through the gas outlet of the gas-solid separation device 3. The inlet of the working fluid turbine 4 is connected, the high-temperature and high-pressure mixed gas expands in the mixed working fluid turbine 4 to do work and drives the generator 5 to rotate and generate electricity. The generator 5 is coaxially connected to the mixed working fluid turbine 4, and the solid Al2O3 is collected through the solid material outlet of the gas-solid separation device 3; the working fluid outlet of the mixed working fluid turbine 4 is connected to the fuel inlet of the hydrogen combustion device 6, and the air inlet of the hydrogen combustion device 6 is connected to the outlet of the air compressor 7. Hydrogen burns in the hydrogen combustion device 6 and releases heat. The generated high-temperature steam is connected to the inlet of the steam turbine 8 through the outlet of the hydrogen combustion device 6. The high-temperature steam expands in the steam turbine 8 to do work and drives the generator 9 to rotate and generate electricity. The generator 9 is coaxially connected to the steam turbine 8. The outlet of the steam turbine 8 is connected to the inlet of the condenser 10. The steam is condensed in the condenser 10 to form water. After the water is collected, it can enter the next cycle for continued use or be used for other purposes;

[0008] The aluminum fuel electrolysis regeneration subsystem includes a transportation device 11 and an alumina electrolysis device 12; the solid Al2O3 produced by the combustion reaction of aluminum and water is transported to the industrial electrolytic aluminum plant via the transportation device 11, the solid Al2O3 is connected to the alumina material inlet of the alumina electrolysis device 12, another material inlet of the alumina electrolysis device 12 is connected to the flux cryolite conveying pipeline, the power supply of the alumina electrolysis device 12 is connected to the surplus renewable energy power supply 13 in the power grid, the alumina undergoes an electrolysis reaction in the alumina electrolysis device 12, and fuel aluminum is regenerated on the cathode of the alumina electrolysis device 12.

[0009] The working method of the aluminum-fired power generation system is that the power generation system uses alumina as raw material. When the renewable energy power generation in the power grid system is excessive or surplus, the molten alumina is electrolyzed by the alumina electrolysis device 12, and the renewable energy power is converted into chemical energy of aluminum fuel through electrochemical reaction for storage. When there is insufficient renewable energy in the power grid system or electricity is needed in some other geographical location in the world, the chemical energy of aluminum fuel is converted into electrical energy through the aluminum combustion power generation subsystem to provide external power supply; the specific process of converting chemical energy into electrical energy is as follows: aluminum fuel and water undergo a violent combustion reaction in the aluminum water combustion device 2, and the reaction products are solid Al2O3, high-temperature and high-pressure steam and hydrogen mixed gas, and the high-temperature and high-pressure mixed gas expands in the mixed working fluid turbine 4 to do work and drive the generator 5 to rotate and generate electricity; in addition, the hydrogen in the mixed working fluid burns and releases heat in the hydrogen combustion device 6, and the generated high-temperature steam expands in the steam turbine 8 to do work and drive the generator 9 to rotate and generate electricity; the solid Al2O3 after the aluminum is burned can be recovered and then passed through the alumina electrolysis device 12 to obtain fuel aluminum again, thereby realizing recycling, and no alumina is consumed in the whole process.

[0010] Beneficial effects of the present invention:

[0011] The aluminum-fired power generation system and its working method described in the present invention have the following advantages: (1) The metal fuel aluminum has a high energy density; (2) The aluminum fuel does not contain carbon, and the entire working process of the system does not generate pollutants, which is a green and low-carbon power generation technology; (3) The renewable energy power is converted into the chemical energy of the metal fuel aluminum through electrochemical reaction for storage, which has the advantages of a long energy storage period and can achieve permanent storage; (4) After the aluminum fuel combustion reaction in the whole process, its combustion products can be regenerated by electrolysis to obtain the metal fuel aluminum again, and the fuel aluminum is recycled and regenerated without consumption in the whole process; (5) Energy storage through metal fuel aluminum facilitates global energy trade. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Among them, 1 is a powder making device, 2 is an aluminum liquid combustion device, 3 is a gas-solid separation device, 4 is a mixed working fluid turbine, 5 is a generator, 6 is a hydrogen combustion device, 7 is an air compressor, 8 is a steam turbine, 9 is a generator, 10 is a condenser, 11 is a transportation device, 12 is an alumina electrolysis device, and 13 is the surplus renewable energy power supply in the power grid. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0015] refer to Figure 1, an aluminum-fired power generation system, comprising an aluminum combustion power generation subsystem and an aluminum fuel electrolysis regeneration subsystem;

[0016] The aluminum combustion power generation subsystem includes a powder making device 1, an aluminum liquid combustion device 2, a gas-solid separation device 3, a mixed working medium turbine 4, a generator 5, a hydrogen combustion device 6, an air compressor 7, a steam turbine 8, a generator 9 and a condenser 10; the aluminum fuel is connected to the material inlet of the powder making device 1 through a conveying pipeline, the outlet of the powder making device 1 is connected to the fuel inlet of the aluminum liquid combustion device 2, and the oxidant inlet of the aluminum liquid combustion device 2 is connected to the oxidant water conveying pipeline. In the aluminum liquid combustion device 2, aluminum powder and water undergo a violent combustion reaction, and the reaction equation is 2Al+3H2O=Al2O3+3H2. During the reaction, the oxidant water is excessive, and the reaction products are solid Al2O3, steam and hydrogen; the outlet of the aluminum liquid combustion device 2 is connected to the inlet of the gas-solid separation device 3. After the gas-solid separation is completed, the mixed gas of steam and hydrogen is connected to the mixed gas through the gas outlet of the gas-solid separation device 3. The inlet of the working fluid turbine 4 is connected, the high-temperature and high-pressure mixed gas expands in the mixed working fluid turbine 4 to do work and drives the generator 5 to rotate and generate electricity. The generator 5 is coaxially connected to the mixed working fluid turbine 4, and the solid Al2O3 is collected through the solid material outlet of the gas-solid separation device 3; the working fluid outlet of the mixed working fluid turbine 4 is connected to the fuel inlet of the hydrogen combustion device 6, and the air inlet of the hydrogen combustion device 6 is connected to the outlet of the air compressor 7. Hydrogen burns in the hydrogen combustion device 6 and releases heat. The generated high-temperature steam is connected to the inlet of the steam turbine 8 through the outlet of the hydrogen combustion device 6. The high-temperature steam expands in the steam turbine 8 to do work and drives the generator 9 to rotate and generate electricity. The generator 9 is coaxially connected to the steam turbine 8. The outlet of the steam turbine 8 is connected to the inlet of the condenser 10. The steam is condensed in the condenser 10 to form water. After the water is collected, it can enter the next cycle for continued use or be used for other purposes;

[0017] The aluminum fuel electrolysis regeneration subsystem includes a transportation device 11 and an alumina electrolysis device 12; solid Al2O3 generated by the combustion reaction of aluminum and water is transported to an industrial electrolytic aluminum plant via the transportation device 11, the solid Al2O3 is connected to an alumina material inlet of the alumina electrolysis device 12, another material inlet of the alumina electrolysis device 12 is connected to a flux cryolite conveying pipeline, the power supply of the alumina electrolysis device 12 is connected to a surplus renewable energy power supply 13 in the power grid, an electrolysis reaction of the alumina occurs in the alumina electrolysis device 12, and fuel aluminum is regenerated on the cathode of the alumina electrolysis device 12.

[0018] The invention discloses an aluminum-burning power generation system that uses aluminum oxide as raw material. When the power grid system generates excess or surplus renewable energy, the aluminum oxide electrolysis device 12 electrolyzes the molten aluminum oxide, and the renewable energy power is converted into the chemical energy of aluminum fuel through electrochemical reaction for storage. When the power grid system generates insufficient renewable energy or a certain geographical location in the world needs power supply, the aluminum combustion power generation subsystem converts the chemical energy of aluminum fuel into electrical energy to realize external power supply. The specific process of converting chemical energy into electrical energy is as follows: aluminum fuel and water undergo a violent combustion reaction in the aluminum water combustion device 2, and the reaction product is solid Al2O3, high-temperature and high-pressure steam and hydrogen mixed gas. The high-temperature and high-pressure mixed gas expands in the mixed working fluid turbine 4 to do work and drives the generator 5 to rotate and generate electricity. In addition, the hydrogen in the mixed working fluid burns in the hydrogen combustion device 6 and releases heat, and the generated high-temperature steam expands in the steam turbine 8 to do work and drives the generator 9 to rotate and generate electricity. The solid Al2O3 after aluminum combustion can be recycled and then passed through the aluminum oxide electrolysis device 12 to obtain fuel aluminum again, thereby realizing recycling, and no aluminum oxide is consumed in the whole process.

[0019] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power generation system using aluminum, characterized in that: It includes an aluminum combustion power generation subsystem and an aluminum fuel electrolysis regeneration subsystem; The aluminum combustion and power generation subsystem comprises a powder making device (1), an aluminum liquid combustion device (2), a gas-solid separation device (3), a mixed working medium turbine (4), a first generator (5), a hydrogen combustion device (6), an air compressor (7), a steam turbine (8), a second generator (9) and a condenser (10); the aluminum fuel is connected to the material inlet of the powder making device (1) through a conveying pipeline, the outlet of the powder making device (1) is connected to the fuel inlet of the aluminum liquid combustion device (2), and the oxygen inlet of the aluminum liquid combustion device (2) is connected to the fuel inlet of the aluminum liquid combustion device (2). The oxidant inlet is connected to the oxidant water delivery pipeline. In the aluminum water combustion device (2), aluminum powder and water undergo a violent combustion reaction, and the reaction equation is 2Al+3H2O=Al2O3+3H2. During the reaction, the oxidant water is excessive, and the reaction products are solid Al2O3, steam and hydrogen. The outlet of the aluminum water combustion device (2) is connected to the inlet of the gas-solid separation device (3). After the gas-solid separation is completed, the mixed gas of steam and hydrogen passes through the gas outlet of the gas-solid separation device (3) and the mixed working medium. The inlet of the mixed working medium turbine (4) is connected, the high-temperature and high-pressure mixed gas expands in the mixed working medium turbine (4) to do work and drives the first generator (5) to rotate and generate electricity, the first generator (5) is coaxially connected to the mixed working medium turbine (4), and the solid Al2O3 is collected through the solid material outlet of the gas-solid separation device (3); the working medium outlet of the mixed working medium turbine (4) is connected to the fuel inlet of the hydrogen combustion device (6), the air inlet of the hydrogen combustion device (6) is connected to the outlet of the air compressor (7), and the hydrogen is discharged into the hydrogen combustion device (6). The hydrogen combustion device (6) burns and releases heat, and the generated high-temperature steam is connected to the inlet of the steam turbine (8) through the outlet of the hydrogen combustion device (6). The high-temperature steam expands in the steam turbine (8) to do work and drives the second generator (9) to rotate and generate electricity. The second generator (9) is coaxially connected to the steam turbine (8). The outlet of the steam turbine (8) is connected to the inlet of the condenser (10). The steam is condensed in the condenser (10) to form water. The water is collected and enters the next cycle for continued use or for other purposes; The aluminum fuel electrolysis regeneration subsystem comprises a transport device (11) and an alumina electrolysis device (12); solid Al2O3 produced by the combustion reaction of aluminum and water is transported to an industrial aluminum electrolysis plant via the transport device (11); the solid Al2O3 is connected to an alumina material inlet of the alumina electrolysis device (12); another material inlet of the alumina electrolysis device (12) is connected to a flux cryolite transport pipeline; the power supply of the alumina electrolysis device (12) is connected to a surplus renewable energy power supply (13) in a power grid; an electrolysis reaction of the alumina occurs in the alumina electrolysis device (12), and fuel aluminum is regenerated on the cathode of the alumina electrolysis device (12); The mass ratio of steam to hydrogen in the inlet working fluid of the mixed working fluid turbine (4) is in the range of (20-45):1; The surplus renewable energy power supply (13) in the power grid is electricity generated by renewable energy that is difficult to be used in the power grid.

2. The operating method of the aluminum-fired power generation system according to claim 1, characterized in that: The power generation system uses aluminum oxide as raw material. When the power grid system generates excess or surplus renewable energy, the aluminum oxide electrolysis device (12) electrolyzes molten aluminum oxide, and converts the renewable energy power into chemical energy of aluminum fuel through electrochemical reaction for storage. When the power grid system generates insufficient renewable energy or a certain geographical location in the world needs power supply, the aluminum combustion power generation subsystem converts the chemical energy of aluminum fuel into electrical energy to supply power to the outside. The specific process of converting chemical energy into electrical energy is as follows: aluminum fuel and water undergo violent combustion in the aluminum water combustion device (2). The reaction product is solid Al2O3, high-temperature and high-pressure steam and hydrogen mixed gas. The high-temperature and high-pressure mixed gas expands in the mixed working fluid turbine (4) to do work and drives the first generator (5) to rotate and generate electricity. In addition, the hydrogen in the mixed working fluid burns in the hydrogen combustion device (6) and releases heat. The generated high-temperature steam expands in the steam turbine (8) to do work and drives the second generator (9) to rotate and generate electricity. The solid Al2O3 after the aluminum is burned is recovered and then passed through the alumina electrolysis device (12) to obtain fuel aluminum again, thereby realizing recycling. No alumina is consumed in the whole process.

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