A system and method for deep peak shaving of a coal-fired boiler of an aluminum fuel energy storage coupled power plant

Abstract

This invention discloses a system and method for deep peak shaving of a coal-fired boiler in a power plant coupled with aluminum fuel energy storage. The system includes an alumina electrolytic cell, a condenser, an aluminum particle storage tank, a gas mixer, an aluminum powder storage tank, an aluminum-water generator, a hydrogen-water vapor separator, a first heat exchanger, a second heat exchanger, a water storage tank, a first hydrogen nozzle, a pulverized coal primary air nozzle, a second hydrogen nozzle, a pulverized coal recombustion zone nozzle, a burnout air nozzle, an economizer, and a boiler body. The method includes: when the renewable energy generation load is insufficient, both renewable energy generation and the power plant's coal-fired power generation are supplied by the grid; when the renewable energy generation load is excessive, it is necessary to maintain the power plant's coal-fired boiler in a low-load stable combustion state; utilizing the excess renewable energy generation... In an alumina electrolysis cell, alumina is electrolyzed to produce aluminum fuel and oxygen. Aluminum powder and turbine extraction steam undergo a chemical reaction in an aluminum-water generator to produce hydrogen. The high-temperature flue gas at the furnace outlet provides the heat required for the reaction, and the heat-exchanged high-temperature flue gas returns to the boiler's vertical flue, increasing the flue gas temperature before the SCR inlet. The hydrogen and steam mixture at the aluminum-water generator outlet is first separated by a hydrogen-steam separator. The hydrogen is sent to the boiler ignition zone to aid in the combustion of pulverized coal, while the steam is used to preheat the oxygen-enriched burnout air and the economizer outlet boiler feedwater through heat exchangers. The pulverized coal fuel is then fed into the boiler's recombustion zone through a pulverized coal recombustion zone nozzle, reducing NO₂ levels during combustion through fuel recombustion. x The amount of oxygen-enriched burnout air generated is introduced into the boiler's burnout zone through burnout air nozzles, improving the boiler's combustion efficiency through both oxygen-enriched gas and preheating. This invention, by coupling a coal-fired power plant boiler and an aluminum fuel energy storage system, achieves an organic integration of new energy power generation and thermal power generation, stabilizing the power grid load and optimizing my country's energy structure.

Description

Technical Field

[0001] This invention belongs to the field of power plant pulverized coal boiler power generation technology, and specifically relates to a system and method for deep peak shaving of a power plant coal-fired boiler coupled with aluminum fuel energy storage. Background Technology

[0002] In recent years, the installed capacity of new energy power generation such as photovoltaic and wind power has increased significantly, offering advantages such as environmental protection and reduced fossil fuel consumption. However, during peak electricity demand periods, new energy power generation suffers from insufficient load due to environmental impacts, while during off-peak periods, there is often excess power generation with nowhere to be utilized. Currently, thermal power still accounts for over 60% of total electricity generation, indicating that it will remain the primary form of power generation for a considerable period. As the installed capacity of new energy power generation increases year by year, the development of deep peak-shaving technology for coal-fired power plant boilers and reliable energy storage technology is necessary to better support new energy power generation.

[0003] Common energy storage methods today include compressed air energy storage, hydroelectric energy storage, and flywheel energy storage. However, these methods suffer from problems such as long construction periods, large investments, and inconvenient transportation of stored energy.

[0004] Currently, the common technologies used for deep peak shaving in coal-fired power plant boilers are oil injection, natural gas injection, and plasma-assisted combustion. Oil and natural gas injection undoubtedly increase the consumption of oil and gas resources, while plasma-assisted combustion increases the thermal shock to the boiler furnace. Furthermore, the coal sources in modern coal-fired power plants are complex and of poor quality, with low volatile matter content in pulverized coal, making it difficult to achieve stable combustion at low loads in the furnace. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a system and method for deep peak shaving of coal-fired boilers in power plants using aluminum fuel energy storage.

[0006] This invention is achieved using the following technical solution:

[0007] A system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant includes an alumina electrolytic cell, a condenser, an aluminum particle storage tank, a gas mixer, an aluminum powder storage tank, an aluminum-water generator, a hydrogen-water vapor separator, a first heat exchanger, a second heat exchanger, a water storage tank, a first hydrogen nozzle, a pulverized coal primary air nozzle, a second hydrogen nozzle, a pulverized coal reburning zone nozzle, a burnout air nozzle, an economizer, and a boiler body, as well as an ignition zone, a reburning zone, and a burnout zone arranged from bottom to top on the boiler body;

[0008] The first hydrogen nozzle, the pulverized coal primary air nozzle, the second hydrogen nozzle, the pulverized coal recombustion zone nozzle, and the burnout air nozzle are arranged from bottom to top in the ignition zone, recombustion zone, and burnout zone of the furnace, respectively; the economizer is arranged in the tail flue.

[0009] The alumina electrolytic cell uses renewable energy to electrolyze alumina into aluminum fuel and oxygen. The aluminum fuel is crushed in an aluminum particle storage tank and then enters an aluminum powder storage tank. In the aluminum-water generator, the aluminum powder fuel reacts chemically with the steam extracted from the turbine to produce a hydrogen-water vapor mixture and alumina. The hydrogen-water vapor mixture is separated in a hydrogen-water vapor separator. The hydrogen is used as a combustion-supporting fuel in the boiler ignition zone to support the combustion of pulverized coal fuel through the first and second hydrogen nozzles. The water vapor passes through the first and second heat exchangers in sequence to become liquid water and is collected in a water storage tank.

[0010] The aluminum-water generator uses the high-temperature flue gas at the furnace outlet to provide the heat required for the chemical reaction, and then introduces it into the vertical flue at the tail of the boiler.

[0011] A portion of the oxygen generated by the electrolysis of the alumina electrolytic cell is used to prepare oxygen-enriched burnout air through a condenser and a gas mixer, and then sent into the burnout air nozzle.

[0012] Pulverized coal fuel is fed into the boiler recombustion zone through the pulverized coal recombustion zone nozzle as recombustion fuel.

[0013] A further improvement of the present invention is that it also includes a flue gas dust collector, a fan, and a chimney, with the tail flue gas being discharged after passing through the flue gas dust collector, the fan, and the chimney respectively.

[0014] A further improvement of the present invention is that the alumina electrolytic cell uses new energy power generation to electrolyze alumina into aluminum fuel and oxygen.

[0015] A further improvement of this invention is that when the load of new energy power generation is insufficient, both new energy power generation and coal-fired power generation in the power plant are supplied by the power grid.

[0016] A further improvement of this invention is that when the load of new energy power generation is excessive, the coal-fired boiler of the power plant is kept in a low-load stable combustion state.

[0017] A further improvement of the present invention is that the primary air nozzle of pulverized coal is arranged between two hydrogen nozzles, so that hydrogen combustion can better assist the combustion of pulverized coal fuel.

[0018] A further improvement of the present invention is that another portion of the oxygen generated by the electrolysis of the alumina electrolytic cell is collected as a chemical product.

[0019] A further improvement of the present invention is that the water vapor separated in the hydrogen-water vapor separator carries a large amount of heat energy and is used to preheat the oxygen-enriched burnout air and the boiler feedwater at the economizer outlet in the first heat exchanger and the second heat exchanger, respectively.

[0020] A method for deep peak shaving of a coal-fired boiler in a power plant coupled with aluminum fuel energy storage includes:

[0021] When the load of new energy power generation is insufficient, both new energy power generation and coal-fired power generation in power plants are supplied by the grid.

[0022] When there is an overcapacity in new energy power generation, it is necessary to maintain the coal-fired boilers of the power plant in a low-load stable combustion state.

[0023] The surplus renewable energy generated is used to electrolyze alumina in an alumina electrolysis cell to produce aluminum fuel and oxygen. The aluminum fuel is first stored in an aluminum particle storage tank. When it is necessary to produce hydrogen through the aluminum-water reaction, the aluminum particles are processed into aluminum powder through crushing and other processes and then enter the aluminum powder storage tank. As for the oxygen produced by electrolyzing alumina, part of it is mixed with air to produce oxygen-enriched burnout air, while the remainder is collected as a chemical product.

[0024] The water collected in the condenser is stored in a water tank;

[0025] Aluminum powder and steam extracted from the turbine undergo a chemical reaction in an aluminum-water generator to produce hydrogen. The high-temperature flue gas at the furnace outlet provides the heat required for the reaction. The high-temperature flue gas after heat exchange returns to the vertical flue of the boiler, increasing the flue gas temperature before the SCR inlet. The mixture of hydrogen and water vapor at the outlet of the aluminum-water generator is first separated by a hydrogen-water vapor separator. The hydrogen is sent to the boiler ignition zone through the first and second hydrogen nozzles to assist in the combustion of pulverized coal fuel, while the water vapor is used to preheat the oxygen-enriched burnout air and the boiler feedwater at the economizer outlet through the first and second heat exchangers, and finally enters the water storage tank.

[0026] Pulverized coal fuel is fed into the boiler's recombustion zone through the pulverized coal recombustion zone nozzle, reducing NO during combustion through fuel recombustion. x Generation quantity; oxygen-enriched burnout air is sent into the burnout zone of the boiler through the burnout air nozzle, and the combustion efficiency of the boiler is improved by both oxygen-enriched gas and preheating.

[0027] A further improvement of the present invention is that it also includes: the flue gas at the tail end of the boiler is discharged into the air after passing through a flue gas dust collector, a fan and a chimney respectively.

[0028] The present invention has at least the following beneficial technical effects:

[0029] This invention provides a system for deep peak shaving of coal-fired boilers in power plants, where aluminum fuel is used to produce hydrogen, a good gaseous fuel that can effectively aid the combustion of pulverized coal in the furnace. Furthermore, the coal sources in modern coal-fired power plants are complex and of poor quality, with low volatile matter content in the pulverized coal, making it difficult to achieve stable combustion at low loads in the furnace. Hydrogen, however, can effectively aid the combustion of low-quality coal, thus enabling deep peak shaving of coal-fired power plant boilers.

[0030] This invention provides a method for deep peak shaving of a coal-fired boiler in a power plant using aluminum fuel energy storage. Aluminum fuel, as a metallic fuel, has the advantages of wide distribution in the Earth's crust, relatively stable chemical properties, and safe and convenient storage and transportation. Metallic aluminum can react chemically with CO2, air, and water. The reaction between aluminum and water can produce hydrogen on-site and release a large amount of heat. Hydrogen is a high-quality fuel, and this chemical reaction produces no carbon emissions. Therefore, metallic aluminum fuel can be used as a high-quality energy storage material.

[0031] In summary, this invention utilizes aluminum fuel, a high-quality energy storage material with abundant sources and convenient transportation. The reaction of aluminum fuel with water generates hydrogen and releases a large amount of heat. Hydrogen, as a high-quality gaseous fuel, can effectively aid the combustion of low-quality coal in the furnace, thereby achieving stable combustion at low loads in coal-fired power plant boilers. Furthermore, the coal-fired power plant can also provide heat and steam to the aluminum-water reactor; the deep coupling of the two can improve the efficiency of industrial production. This invention, by coupling a coal-fired power plant boiler and an aluminum fuel energy storage system, achieves an organic combination of new energy power generation and thermal power generation, stabilizing the power grid load, optimizing the energy structure, reducing carbon emissions, and improving the efficiency of industrial production. Attached Figure Description

[0032] Figure 1 This is a structural block diagram of a system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant, according to the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1 is an alumina electrolytic cell, 2 is a condenser, 3 is an aluminum particle storage tank, 4 is a gas mixer, 5 is an aluminum powder storage tank, 6 is an aluminum-to-water generator, 7 is a hydrogen-water vapor separator, 8 is a first heat exchanger, 9 is a second heat exchanger, 10 is a water storage tank, 11 is a first hydrogen nozzle, 12 is a pulverized coal primary air nozzle, 13 is a second hydrogen nozzle, 14 is a pulverized coal recombustion zone nozzle, 15 is a burnout air nozzle, 16 is an economizer, 17 is a flue gas dust collector, 18 is a fan, 19 is a chimney, and 20 is the boiler body. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] See Figure 1This invention provides a system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant, comprising an alumina electrolytic cell 1, a condenser 2, an aluminum particle storage tank 3, a gas mixer 4, an aluminum powder storage tank 5, an aluminum-water generator 6, a hydrogen-water vapor separator 7, a first heat exchanger 8, a second heat exchanger 9, a water storage tank 10, a first hydrogen nozzle 11, a pulverized coal primary air nozzle 12, a second hydrogen nozzle 13, a pulverized coal reburning zone nozzle 14, a burnout air nozzle 15, an economizer 16, a flue gas dust collector 17, a fan 18, a chimney 19, and a boiler body 20, and an ignition zone, a reburning zone, and a burnout zone arranged from bottom to top on the boiler body 20; wherein, when the load of new energy power generation is insufficient, both new energy power generation and coal-fired power generation in the power plant are supplied by the grid.

[0037] Furthermore, when there is an overcapacity in new energy power generation, it is necessary to maintain the coal-fired boilers of the power plant in a low-load, stable combustion state.

[0038] Furthermore, the excess renewable energy power generation is used to electrolyze alumina in alumina electrolysis cell 1 to generate aluminum fuel and oxygen. The aluminum fuel is first stored in aluminum particle storage tank 3. When it is necessary to produce hydrogen through aluminum-water reaction, the aluminum particles are processed into aluminum powder through crushing and other processes and enter aluminum powder storage tank 5. As for the oxygen generated by electrolysis of alumina, part of it is mixed with air to produce oxygen-enriched burnout air, while the remainder is collected as a chemical product.

[0039] Furthermore, the water collected in condenser 2 is collected in water storage tank 10.

[0040] Furthermore, aluminum powder and turbine extraction steam undergo a chemical reaction in the 6-aluminum-water generator to produce hydrogen. The high-temperature flue gas at the furnace outlet provides the heat required for the reaction, and the high-temperature flue gas after heat exchange returns to the vertical flue of the boiler, increasing the flue gas temperature before the SCR inlet. The hydrogen and water vapor mixture at the outlet of the aluminum-water generator 6 is first separated by a hydrogen-water vapor separator 7. The hydrogen is then sent to the boiler ignition zone through the first hydrogen nozzle 11 and the second hydrogen nozzle 13 to aid the combustion of pulverized coal, while the water vapor is preheated in stages by the first heat exchanger 8 and the second heat exchanger 9 to preheat the oxygen-enriched burnout air and the boiler feedwater at the economizer outlet. After two stages of heat exchange, the water vapor becomes liquid water and finally enters the water storage tank 10. In the boiler ignition zone, the pulverized coal primary air nozzle 12 is arranged between the two hydrogen nozzles, allowing the hydrogen combustion to better aid the combustion of pulverized coal.

[0041] Furthermore, pulverized coal fuel is fed into the boiler recombustion zone through the pulverized coal recombustion zone nozzle 14, reducing NO during combustion through fuel recombustion. xGeneration rate; Oxygen-enriched burnout air is delivered into the boiler's burnout zone through burnout air nozzle 15, improving the boiler's combustion efficiency through both oxygen-enriched gas and preheating. The combination of aluminum fuel energy storage and deep peak shaving of coal-fired power plant boilers not only achieves stable combustion under low loads during deep peak shaving but also improves boiler combustion efficiency, achieving high-efficiency, low-NOx combustion in power plant boilers. x combustion.

[0042] Furthermore, the high-temperature flue gas at the furnace outlet provides the heat required for the chemical reaction in the aluminum-water generator 6, and then it is introduced into the vertical flue at the tail of the boiler to ensure the temperature of the flue gas at the SCR inlet.

[0043] Furthermore, the flue gas at the tail end of the boiler is discharged into the air after passing through the flue gas dust collector 17, the fan 18, and the chimney 19.

[0044] See Figure 1 The present invention provides a method for deep peak shaving of an aluminum fuel energy storage coupled boiler, comprising:

[0045] When the load of new energy power generation is insufficient, both new energy power generation and coal-fired power generation in power plants are supplied by the grid.

[0046] When there is an overcapacity in new energy power generation, it is necessary to maintain the coal-fired boilers of the power plant in a low-load stable combustion state.

[0047] The excess renewable energy generated is used to electrolyze alumina in an alumina electrolysis cell 1 to produce aluminum fuel and oxygen. The aluminum fuel is first stored in an aluminum particle storage tank 3. When it is necessary to produce hydrogen through an aluminum-water reaction, the aluminum particles are processed into aluminum powder through crushing and other processes and enter the aluminum powder storage tank 5. The oxygen produced by electrolyzing alumina is partly mixed with air to produce oxygen-enriched burnout air, while the remainder is collected as a chemical product.

[0048] The water collected in condenser 2 is collected in water storage tank 10;

[0049] Aluminum powder and steam extracted from the turbine undergo a chemical reaction in the aluminum-water generator 6 to produce hydrogen. The high-temperature flue gas at the furnace outlet provides the heat required for the reaction. The high-temperature flue gas after heat exchange returns to the vertical flue of the boiler to increase the flue gas temperature before the SCR inlet. The mixture of hydrogen and water vapor at the outlet of the aluminum-water generator 6 is first separated by the hydrogen-water vapor separator 7. The hydrogen is sent to the boiler ignition zone to assist in the combustion of pulverized coal fuel through the first hydrogen nozzle 11 and the second hydrogen nozzle 13, while the water vapor is used to preheat the oxygen-enriched burnout air and the boiler feedwater at the economizer outlet through the first heat exchanger 8 and the second heat exchanger 9, and finally enters the water storage tank 10.

[0050] Pulverized coal fuel is fed into the boiler recombustion zone through the pulverized coal recombustion zone nozzle 14, reducing NO during combustion through fuel recombustion. xGeneration amount; oxygen-enriched burnout air is sent into the boiler burnout zone through burnout air nozzle 15, and the combustion efficiency of the boiler is improved by both oxygen-enriched gas and preheating.

[0051] The flue gas at the tail end of the boiler is discharged into the air after passing through the flue gas dust collector 17, the fan 18 and the chimney 19.

[0052] In summary, the present invention has the following advantages:

[0053] (1) Using aluminum fuel as an energy storage material can enable rapid energy storage and hydrogen production;

[0054] (2) The hydrogen produced by the aluminum-water chemical reaction can be burned in the boiler to release heat and assist the combustion of pulverized coal fuel, thereby achieving stable combustion at low load in the coal-fired boiler of the power plant;

[0055] (3) The high-temperature steam generated by the aluminum-water chemical reaction preheats the oxygen-enriched burnout air and the boiler economizer outlet feedwater in two heat exchangers in stages, which can improve the boiler combustion efficiency.

[0056] (4) In addition to generating aluminum fuel for energy storage, electrolytic alumina also generates oxygen. Part of the oxygen is mixed with air to form oxygen-enriched burnout air, while the remaining oxygen is collected as a chemical product. Thus, this industrial system achieves chemical multi-generation.

[0057] (5) Pulverized coal fuel, as a reburning fuel, can reduce NO during the combustion process. x The amount of NO generated is reduced, and the preheated oxygen-enriched burnout air can improve the boiler combustion efficiency. Therefore, the combination of the two can achieve high efficiency and low NO production in power plant coal-fired boilers. x combustion.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A system for deep peak shaving of a coal-fired boiler in a power plant coupled with aluminum fuel energy storage, characterized in that, It includes an alumina electrolytic cell (1), a condenser (2), an aluminum particle storage tank (3), a gas mixer (4), an aluminum powder storage tank (5), an aluminum-water generator (6), a hydrogen-water vapor separator (7), a first heat exchanger (8), a second heat exchanger (9), a water storage tank (10), a first hydrogen nozzle (11), a pulverized coal primary air nozzle (12), a second hydrogen nozzle (13), a pulverized coal reburning zone nozzle (14), a burnout air nozzle (15), an economizer (16), and a boiler body (20), as well as an ignition zone, a reburning zone, and a burnout zone arranged from bottom to top on the boiler body (20); The first hydrogen nozzle (11), the pulverized coal primary air nozzle (12), the second hydrogen nozzle (13), the pulverized coal recombustion zone nozzle (14), and the burnout air nozzle (15) are arranged from bottom to top in the ignition zone, recombustion zone, and burnout zone of the furnace, respectively. The pulverized coal primary air nozzle (12) is arranged between the first hydrogen nozzle (11) and the second hydrogen nozzle (13). The economizer (16) is arranged in the tail flue. The alumina electrolytic cell (1) uses new energy power generation to electrolyze alumina into aluminum fuel and oxygen. The aluminum fuel is crushed by the aluminum particle storage tank (3) and then enters the aluminum powder storage tank (5). Then, in the aluminum-water generator (6), the aluminum powder fuel reacts with the steam extracted from the steam turbine to obtain a hydrogen-water vapor mixture and alumina. The hydrogen-water vapor mixture is separated in the hydrogen-water vapor separator (7). The hydrogen is used as a combustion fuel to assist the combustion of pulverized coal fuel in the boiler ignition zone through the first hydrogen nozzle (11) and the second hydrogen nozzle (13). The water vapor separated in the hydrogen-water vapor separator (7) is used to preheat the oxygen-enriched burnout air and the boiler feedwater at the outlet of the economizer (16) in the first heat exchanger (8) and the second heat exchanger (9). After preheating, it becomes liquid water and is collected in the water storage tank (10). The aluminum-water generator (6) uses the high-temperature flue gas at the furnace outlet to provide the heat required for the chemical reaction, and then passes it into the vertical flue at the tail of the boiler. A portion of the oxygen generated by the electrolysis of the alumina electrolytic cell (1) is used to prepare oxygen-enriched burnout air through the condenser (2) and gas mixer (4), and then sent into the burnout air nozzle (15). Pulverized coal fuel is fed into the boiler reburning zone through the pulverized coal reburning zone nozzle (14) as reburning fuel.

2. The system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant according to claim 1, characterized in that, It also includes a flue gas dust collector (17), a fan (18) and a chimney (19), and the tail flue gas is discharged after passing through the flue gas dust collector (17), the fan (18) and the chimney (19).

3. The system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant according to claim 1, characterized in that, The alumina electrolytic cell (1) uses new energy power generation to electrolyze alumina into aluminum fuel and oxygen.

4. The system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant according to claim 3, characterized in that, When the load of new energy power generation is insufficient, both new energy power generation and coal-fired power generation in the power plant are supplied by the grid.

5. A system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant, as described in claim 3, is characterized in that... When there is an overcapacity in renewable energy generation, the coal-fired boilers of the power plant should be kept in a low-load, stable combustion state.

6. The system for deep peak shaving of a coal-fired boiler coupled with aluminum fuel energy storage in a power plant according to claim 1, characterized in that, The oxygen produced by the electrolysis of the alumina electrolytic cell (1) is collected as a chemical product.

7. A method for deep peak shaving of a coal-fired boiler in a power plant coupled with aluminum fuel energy storage as described in claim 1, characterized in that, include: When the load of new energy power generation is insufficient, both new energy power generation and coal-fired power generation in power plants are supplied by the grid. When there is an overcapacity in new energy power generation, it is necessary to maintain the coal-fired boilers of the power plant in a low-load stable combustion state. The excess new energy power generation is used to electrolyze alumina in an alumina electrolysis cell (1) to generate aluminum fuel and oxygen. The aluminum fuel is first stored in an aluminum particle storage tank (3). When it is necessary to carry out the aluminum-water reaction to produce hydrogen, the aluminum particles are processed into aluminum powder through crushing and other processes and enter the aluminum powder storage tank (5). The oxygen generated by electrolyzing alumina is partly mixed with air to produce oxygen-enriched burnout air, and the remainder is collected as a chemical product. The water collected in the condenser (2) is collected in the water storage tank (10); Aluminum powder and steam extracted from the steam turbine undergo a chemical reaction in the aluminum-water generator (6) to produce hydrogen. The high-temperature flue gas at the furnace outlet provides the heat required for the reaction. The high-temperature flue gas after heat exchange returns to the vertical flue of the boiler to increase the flue gas temperature before the SCR inlet. The mixture of hydrogen and water vapor at the outlet of the aluminum-water generator (6) is first separated by a hydrogen-water vapor separator (7). The hydrogen is sent into the boiler ignition zone to assist in the combustion of pulverized coal fuel through the first hydrogen nozzle (11) and the second hydrogen nozzle (13), while the water vapor is preheated in stages by the first heat exchanger (8) and the second heat exchanger (9) for the oxygen-enriched burnout air and the boiler feedwater at the economizer outlet, and finally enters the water storage tank (10). Pulverized coal fuel is fed into the boiler recombustion zone through the pulverized coal recombustion zone nozzle (14), and the NO during combustion is reduced by fuel recombustion. x The amount generated; the oxygen-enriched burnout air is sent into the burnout zone of the boiler through the burnout air nozzle (15) to improve the combustion efficiency of the boiler through both oxygen-enriched gas and preheating.

8. The method for deep peak shaving of a coal-fired boiler in an aluminum fuel energy storage coupled power station according to claim 7, characterized in that, Also includes: The flue gas at the tail end of the boiler is discharged into the air after passing through the flue gas dust collector (17), the fan (18) and the chimney (19).

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