Biomass blending combustion coupling aluminum fuel energy storage system and method for coal-fired unit

Abstract

The invention discloses a coal-fired unit biomass blending combustion coupling aluminum fuel energy storage system and method. The system comprises an Al2O3 electrolytic cell, an O2 condenser, a gas mixer, an aluminum powder storage device, an Al-H2O reactor, an H2-H2O (g) separator, a biomass coal mill and a boiler body. Aluminum particles and O2 are prepared and obtained through an Al2O3 electrolytic cell; o2 is dried in the O2 condenser and then mixed with air in the gas mixer to obtain oxygen-enriched air; part of extracted steam of the steam turbine and aluminum powder are subjected to chemical reaction in the Al-H2O reactor, prepared Al2O3 is collected, and mixed gas of H2 and H2O (g) is introduced into the H2-H2O (g) separator; h2 (g) obtained through separation in the H2-H2O (g) separator serves as combustion-supporting fuel and is fed into a hearth to be combusted through an H2 combustion nozzle; biomass fuel is crushed by the biomass coal mill and then fed into the hearth for combustion through a biomass combustor nozzle. The invention provides a new efficient, low-carbon and flexible coal-fired power generation mode.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of thermal power generation, and particularly relates to a system and method for coupling aluminum fuel energy storage in biomass blending combustion of a coal-fired unit. BACKGROUND

[0002] As the main power source, coal-fired units are facing great carbon emission reduction pressure and demand for flexibility improvement. On the one hand, in order to achieve deep decarbonization, blending combustion of biomass fuel (such as straw, sawdust, etc.) is considered as a realistic and feasible low-carbon transformation path. Biomass absorbs carbon dioxide during growth, and the carbon released by its combustion can be considered as near-zero emission. By blending combustion, the overall carbon emission intensity of the unit can be significantly reduced, and it is also helpful for the disposal of agricultural and forestry waste. However, there are obvious bottlenecks in the practical application of biomass blending combustion. Biomass resources have strong seasonality and regional characteristics, low energy density, and large fluctuations in fuel characteristics (such as moisture, ash, and volatile matter), making it difficult to supply on a large scale and stably. Direct blending into a coal-fired boiler for combustion can easily affect the stability of combustion, the efficiency of the boiler, and cause impact on the existing pulverizing, combustion, and dust removal systems. The blending ratio is difficult to increase significantly, and the emission reduction potential is limited.

[0003] On the other hand, the large-scale access of renewable energy (wind, light) has intensified the volatility of the power grid, and higher requirements have been put forward for the deep peak shaving capacity and rapid response capacity of coal-fired units. Traditional coal-fired units are limited by their inherent characteristics such as large thermal inertia and slow variable load rate, making it difficult to meet the growing demand for flexibility. Energy storage technology is considered as a key means to solve power grid fluctuations and improve system flexibility. Among many energy storage technologies, metal fuel energy storage technology (aluminum fuel) using aluminum as an energy carrier has great potential due to its extremely high theoretical volume / mass energy density (much higher than lithium batteries), intrinsic safety, easy long-term storage, and long-distance transportation. Aluminum can store electricity through electrolytic water hydrogen production coupled with aluminum smelting, and release energy when needed through aluminum-water / air reaction (main products are aluminum oxide and hydrogen, which can be burned or used in fuel cells). However, the aluminum fuel reaction system (especially efficient and controllable reactor design) and large-scale heat energy utilization integration technology are not mature, and the independent power generation cost is high, which is a bottleneck for its large-scale application.

[0004] Therefore, it is urgent to explore an innovative system integration scheme that can solve the dual problems of low-carbon transformation and flexibility improvement of coal-fired units, and overcome the technical and economic bottlenecks faced by biomass blending combustion and aluminum fuel energy storage. SUMMARY

[0005] The present application provides a coal-fired unit biomass blending combustion coupled aluminum fuel energy storage system and method, aiming to organically combine the carbon emission reduction benefits of biomass blending combustion with the flexible regulation and energy density advantages of aluminum fuel energy storage, and to build an efficient, low-carbon and flexible new coal-fired power generation mode, thereby providing strong technical support for the green and low-carbon transformation of traditional coal-fired units.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A coal-fired unit biomass blending combustion coupled aluminum fuel energy storage system, comprising an Al2O3 electrolytic cell, an O2 condenser, a gas mixer, an aluminum powder storage tank, an Al-H2O reactor, an H2-H2O(g) separator, a biomass coal mill and a boiler body; the O2 outlet of the Al2O3 electrolytic cell is connected to the inlet of the O2 condenser, the O2 outlet of the O2 condenser is connected to the O2 inlet of the gas mixer, and the outlet of the gas mixer is connected to the overfire air nozzle of the boiler body; the aluminum particle outlet of the Al2O3 electrolytic cell is connected to the inlet of the aluminum powder storage tank, the outlet of the aluminum powder storage tank is connected to the inlet of the Al-H2O reactor, the outlet of the Al-H2O reactor is connected to the inlet of the H2-H2O(g) separator, the H2(g) outlet of the H2-H2O(g) separator is connected to the H2 burner nozzle of the boiler body, and the outlet of the biomass coal mill is connected to the biomass burner nozzle of the boiler body.

[0008] Further improvement of the present application is that the Al2O3 electrolytic cell is used to produce O2 and aluminum particles by using redundant power generated by wind power and photovoltaic power generation.

[0009] Further improvement of the present application is that the tail flue outlet of the boiler body is sequentially connected with a dust remover and a chimney.

[0010] Further improvement of the present application is that an induced draft fan is further arranged between the dust remover and the chimney.

[0011] Further improvement of the present application is that an oxygen-enriched air storage tank is further included, and the outlet of the gas mixer is connected to the overfire air nozzle of the boiler body through the oxygen-enriched air storage tank 8.

[0012] Further improvement of the present application is that an aluminum particle storage tank is further included, and the aluminum particle outlet of the Al2O3 electrolytic cell is connected to the inlet of the aluminum powder storage tank through the aluminum particle storage tank.

[0013] Further improvement of the present application is that the H2O(g) outlet of the H2-H2O(g) separator is connected to the inlet of an H2O(g) condenser.

[0014] Further improvement of the present application is that the H2(g) outlet of the H2-H2O(g) separator is connected to the biomass burner nozzle of the boiler body through an H2 induced draft fan.

[0015] The further improvement of the present application is that the coal combustion burner nozzle is arranged above the biomass burner nozzle of the boiler body.

[0016] A method for biomass blending combustion coupled with aluminum fuel energy storage of a coal-fired unit, which is based on the system for biomass blending combustion coupled with aluminum fuel energy storage of the coal-fired unit, comprising:

[0017] The power generated by wind power generation and photovoltaic power generation is used to provide electric energy for the Al2O3 electrolytic cell, and aluminum particles and O2 are prepared.

[0018] The aluminum particles are crushed to obtain aluminum powder which is stored in an aluminum powder storage, and the O2 is dried in an O2 condenser and mixed with air in a gas mixer to obtain oxygen-enriched air.

[0019] Part of the steam turbine extraction is chemically reacted with aluminum powder in an Al-H2O reactor, and the prepared Al2O3 is collected, and the mixed gas of H2 and H2O(g) is introduced into an H2-H2O(g) separator.

[0020] The H2(g) separated in the H2-H2O(g) separator is sent into the furnace combustion through an H2 combustion nozzle as a combustion-supporting fuel.

[0021] The biomass fuel is crushed by a biomass coal mill and sent into the furnace combustion through a biomass burner nozzle.

[0022] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0023] The system and method for biomass blending combustion coupled with aluminum fuel energy storage of a coal-fired unit provided by the present application store the redundant power generated by new energy by using aluminum fuel energy storage, and generate H2 for combustion support when biomass fuel is needed; the present application uses H2 combustion to release a large amount of heat to support the combustion of biomass fuel, so that the safe and stable combustion of biomass fuel with high moisture content in the boiler is realized; the present application reduces the coal consumption of the coal-fired unit by burning H2 and biomass fuel; H2 and biomass fuel are both zero-carbon fuels, so the carbon emissions of the coal-fired unit are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a schematic diagram of the system of the present application.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1 - Al2O3 electrolysis cell, 2 - O2 condenser, 3 - aluminum particle reservoir, 4 - gas mixer, 5 - aluminum powder reservoir, 6 - Al-H2O reactor, 7 - H2-H2O(g) separator, 8 - oxygen-enriched air storage tank, 9 - H2O(g) condenser, 10 - biomass pulverizer, 11 - H2 draft fan, 12 - H2 burner nozzle, 13 - biomass burner nozzle, 14 - coal-fired burner nozzle, 15 - overfire air nozzle, 16 - air preheater, 17 - dust collector, 18 - draft fan, 19 - stack, 20 - boiler body. DETAILED DESCRIPTION

[0028] Hereinafter, certain exemplary embodiments are described simply. As can be recognized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are to be regarded as illustrative in nature rather than restrictive.

[0029] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0030] In addition, the terms "first", "second", etc. are used only for the purpose of description and cannot be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specifically limited.

[0031] In the present application, unless specifically defined otherwise or limited in the specification, the terms "mounting", "connected", "connection", "fixed", and the like, are used broadly and encompass both direct and indirect mounting, connection, and fixation, as well as fixed or detachable mounting, connection, and fixation. Further, the terms "connected" and "connection" are used in broad sense and can include mechanical connection, electrical connection, communication connection, and the like, as well as direct and indirect connection. The terms "mounted" and "mounting" are used broadly and encompass both fixed and detachable mounting, as well as mechanical mounting, electrical mounting, and the like. The terms "mounted", "mounting", "connected", and "connection" can be understood in the specific context as the skilled person would understand them.

[0032] In the present application, unless specifically defined otherwise or limited in the specification, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Further, "on", "above", and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. "Under", "below", and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0033] It should be understood that the terms used in the specification of the present application are only for the purpose of describing particular embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0034] It should also be understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0035] Various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and certain details can be omitted. The shapes of various regions, layers, and the relative size and positional relationship between them shown in the drawings are only exemplary, and in actuality can deviate due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1

[0038] Reference Figure 1The application provides a system for coupling biomass blending combustion of a coal-fired unit with aluminum fuel energy storage, which comprises an Al2O3 electrolytic cell 1, an O2 condenser 2, a gas mixer 4, an aluminum powder reservoir 5, an Al-H2O reactor 6, an H2-H2O(g) separator 7, a biomass coal mill 10 and a boiler body 20.

[0039] The O2 outlet of the Al2O3 electrolytic cell 1 is connected to the inlet of the O2 condenser 2, the O2 outlet of the O2 condenser 2 is connected to the O2 inlet of the gas mixer 4, and the outlet of the gas mixer 4 is connected to the overfire air nozzle 15 of the boiler body 20; the aluminum particle outlet of the Al2O3 electrolytic cell 1 is connected to the inlet of the aluminum powder reservoir 5, the outlet of the aluminum powder reservoir 5 is connected to the inlet of the Al-H2O reactor 6, the outlet of the Al-H2O reactor 6 is connected to the inlet of the H2-H2O(g) separator 7, the H2(g) outlet of the H2-H2O(g) separator 7 is connected to the H2 burner nozzle 12 of the boiler body 20, and the outlet of the biomass coal mill 10 is connected to the biomass burner nozzle 13 of the boiler body 20.

[0040] In the embodiment, the Al2O3 electrolytic cell 1 is used to produce O2 and aluminum particles by using redundant power generated by wind power and photovoltaic power generation.

[0041] In the embodiment, the tail flue outlet of the boiler body 20 is sequentially connected with a dust remover 17 and a chimney 19.

[0042] In the embodiment, an induced draft fan 18 is further arranged between the dust remover 17 and the chimney 19.

[0043] In the embodiment, an oxygen-enriched air storage tank 8 is further included, and the outlet of the gas mixer 4 is connected to the overfire air nozzle 15 of the boiler body 20 through the oxygen-enriched air storage tank 8.

[0044] In the embodiment, an aluminum particle reservoir 3 is further included, and the aluminum particle outlet of the Al2O3 electrolytic cell 1 is connected to the inlet of the aluminum powder reservoir 5 through the aluminum particle reservoir 3.

[0045] In the embodiment, the H2O(g) outlet of the H2-H2O(g) separator 7 is connected to the inlet of an H2O(g) condenser 9.

[0046] In the embodiment, the H2(g) outlet of the H2-H2O(g) separator 7 is connected to the biomass burner nozzle 13 of the boiler body 20 through an H2 induced draft fan 11.

[0047] In the embodiment, a coal-fired burner nozzle 14 is arranged above the biomass burner nozzle 13 of the boiler body 20.

[0048] Embodiment 2

[0049] ReferenceFigure 1 The application provides a system for coupling biomass blending combustion of a coal-fired unit with aluminum fuel energy storage, which comprises an Al2O3 electrolytic cell 1, an O2 condenser 2, an aluminum particle reservoir 3, a gas mixer 4, an aluminum powder reservoir 5, an Al-H2O reactor 6, an H2-H2O(g) separator 7, an oxygen-enriched air storage tank 8, an H2O(g) condenser 9, a biomass coal mill 10, an H2 air blower 11, an H2 burner nozzle 12, a biomass burner nozzle 13, a coal burner nozzle 14, an overfire air nozzle 15, an air preheater 16, a dust collector 17, an air blower 18, a chimney 19 and a boiler body 20.

[0050] The system for coupling biomass blending combustion of a coal-fired unit with aluminum fuel energy storage is connected in the following manner:

[0051] O2 and aluminum particles are produced by using redundant power generated by wind power and photovoltaic power in the Al2O3 electrolytic cell 1, wherein the O2 is introduced into the O2 condenser 2 for condensation, and the H2O(l) obtained after condensation is collected as make-up water of the boiler, and the dry O2 is introduced into the gas mixer 4 to be mixed with air to prepare oxygen-enriched air, which is collected and stored in the oxygen-enriched air storage tank 8; the aluminum particle fuel produced after electrolysis of the Al2O3 electrolytic cell 1 is stored in the aluminum particle reservoir 3, and then prepared into aluminum powder after crushing and the like, and collected and stored in the aluminum powder reservoir 5. The oxygen-enriched air in the oxygen-enriched air storage tank 8 is sent into the overfire air zone of the boiler through the overfire air nozzle 15 as oxygen-enriched overfire air, so that the combustion efficiency of the boiler can be improved and the NOx emission can be reduced. The aluminum powder in the aluminum powder reservoir 5 is chemically reacted with part of the steam turbine extraction steam in the Al-H2O reactor 6, the mixed gas obtained is sent into the H2-H2O(g) separator 7 for separation, and the H2(g) is sent into the furnace as combustion-supporting fuel through the 12-H2 combustion nozzle. The H2O(g) at the outlet of the H2-H2O(g) separator 7 is introduced into the H2O(g) condenser 9 for condensation to obtain H2O(l), which can be used as make-up water of the boiler. The H2 burner nozzle 12, the biomass burner nozzle 13 and the coal burner nozzle 14 are arranged from bottom to top in the furnace. The biomass fuel is crushed by the biomass coal mill 10 and then sent into the furnace through the biomass burner nozzle 13 for combustion. The flue gas generated by the combustion of the boiler body 20 can be discharged after being dedusted in the dust collector 17, passing through the air blower 18 and the chimney 19.

[0052] The air preheater 16 is located at the end of the tail flue and is a component through which the flue gas flows.

[0053] Example 3

[0054] Reference Figure 1 The application provides a method for coupling biomass blending combustion of a coal-fired unit with aluminum fuel energy storage, which is based on the system for coupling biomass blending combustion of a coal-fired unit with aluminum fuel energy storage and comprises the following steps:

[0055] The redundant power generated by wind power generation and photovoltaic power generation provides electric energy for the Al2O3 electrolytic cell 1, and aluminum particles and O2 are prepared;

[0056] The aluminum particles are crushed to obtain aluminum powder which is stored in the aluminum powder storage 5, and the O2 is dried in the O2 condenser 2 and mixed with air in the gas mixer 4 to obtain oxygen-enriched air;

[0057] Part of the steam turbine extraction is chemically reacted with aluminum powder in the Al-H2O reactor 6, and the prepared Al2O3 is collected, and the mixed gas of H2 and H2O(g) is introduced into the H2-H2O(g) separator 7;

[0058] The H2(g) separated in the H2-H2O(g) separator 7 is sent into the furnace combustion as a combustion-supporting fuel through the H2 combustion nozzle 12;

[0059] The biomass fuel is crushed by the biomass coal mill 10 and sent into the furnace combustion through the biomass burner nozzle 13.

[0060] Example 4

[0061] Reference Figure 1 The present application provides a method for coupling biomass blending combustion and aluminum fuel energy storage of a coal-fired unit, and the operation steps are as follows:

[0062] 1) The redundant power generated by wind power generation and photovoltaic power generation provides electric energy for the Al2O3 electrolytic cell 1, and aluminum particles and O2 are prepared;

[0063] 2) The aluminum particles are crushed through processes such as crushing to obtain aluminum powder which is stored in the aluminum powder storage 5, and the O2 is dried in the O2 condenser 2 and mixed with air in the gas mixer 4 to obtain oxygen-enriched air, which is then stored in the oxygen-enriched air storage tank 8;

[0064] 3) The H2O(l) condensed in the O2 condenser 2 can be used as boiler makeup water;

[0065] 4) Part of the steam turbine extraction is chemically reacted with aluminum powder in the Al-H2O reactor 6, and the prepared Al2O3 is collected, and the mixed gas of H2 and H2O(g) is introduced into the H2-H2O(g) separator 7;

[0066] 5) The H2(g) separated in the H2-H2O(g) separator 7 is sent into the furnace combustion as a combustion-supporting fuel through the H2 combustion nozzle 12; the H2O(g) at the outlet of the H2-H2O(g) separator 7 is introduced into the H2O(g) condenser 9 to be condensed and collected to obtain H2O(l), which can be used as boiler makeup water.

[0067] 6) Biomass fuel is sent into the furnace through the biomass burner nozzle 13 after being crushed by the biomass coal mill 10.

[0068] 7) The flue gas generated by the boiler body 20 can be discharged through the induced draft fan 18 and the chimney 19 after being dedusted in the dust remover 17.

[0069] The key points of the present application are as follows:

[0070] The system and method for coupling aluminum fuel energy storage in biomass blending combustion of coal-fired units comprises an Al2O3 electrolytic cell, an O2 condenser, an aluminum particle reservoir, a gas mixer, an aluminum powder reservoir, an Al-H2O reactor, an H2-H2O(g) separator, an oxygen-enriched air storage tank, an H2O(g) condenser, a biomass coal mill, an H2 induced draft fan, an H2 burner nozzle, a biomass burner nozzle, a coal burner nozzle, an overfire air nozzle, an air preheater, a dust remover, an induced draft fan, a chimney, and a boiler body.

[0071] The key point of the present application is that the reaction efficiency can be improved and high-temperature H2 can be generated by using steam turbine extraction steam as the reaction working medium of the Al-H2O reactor, and H2 can be sent into the furnace for combustion to improve the low-load stable combustion capability of the unit under low-load conditions.

[0072] The key point of the present application is that the H2 burner nozzle is arranged below the biomass burner nozzle, which can prolong the residence time of H2 in the furnace and improve its combustion efficiency, and can also use the heat released by H2 combustion to assist the combustion of biomass fuel.

[0073] The key point of the present application is that Al generated by Al2O3 electrolysis can be used for energy storage, H2O(l) generated after O2 condensation has high purity and can be used as boiler makeup water, and O2 and air can be mixed to prepare oxygen-enriched air; the oxygen-enriched air can be burned in the overfire zone of the boiler to improve the combustion efficiency of the boiler and reduce NO x emissions.

[0074] The key point of the present application is that H2O(g) separated by the H2-H2O(g) separator can be condensed in the H2O(g) condenser and used as boiler makeup water.

[0075] The key point of the present application is that the metal aluminum fuel energy storage system is combined with the biomass blending combustion system of coal-fired units, which greatly reduces the use of high-quality coal resources and can greatly reduce the carbon emissions of the unit.

[0076] The key point of the present application is that the redundant power generated by wind and solar power generation is fully utilized, and it is combined with thermal power generation, which greatly reduces the carbon emissions of the power system.

[0077] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the exact details shown above and described herein, and obvious modifications will occur to those skilled in the art upon reading the foregoing description. Therefore, the scope of the application is not to be determined by the specific examples shown above, but only by the claims below. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0078] Furthermore, it should be appreciated that although the present specification describes particular embodiments, each of which contain only a single independent technology, the specification makes no implication that the application is limited to such. Rather, the specification using such terms as "in one embodiment" or "in an embodiment" is to establish as many independent embodiments as can be explicitly or implicitly disclosed. The mere inclusion of such terms, however, does not limit those embodiments but rather, the broadest possible interpretation of the specification is intended. The specification is not intended to be limited to the embodiments described herein, but rather the claims should be accorded the full scope consistent with the claims for which the support is recognized in the art. No language in the specification should be construed as indicating any non-claimed element as essential. The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the exact details shown above and described herein, and obvious modifications will occur to those skilled in the art upon reading the foregoing description. Therefore, the scope of the application is not to be determined by the specific examples shown above, but only by the claims below. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0078] Furthermore, it should be appreciated that although the present specification describes particular embodiments, each of which contain only a single independent technology, the specification makes no implication that the application is limited to such. Rather, the specification using such terms as "in one embodiment" or "in an embodiment" is to establish as many independent embodiments as can be explicitly or implicitly disclosed. The mere inclusion of such terms, however, does not limit those embodiments but rather, the broadest possible interpretation of the specification is intended. The specification is not intended to be limited to the embodiments described herein, but rather the claims should be accorded the full scope consistent with the claims for which the support is recognized in the art. No language in the specification should be construed as indicating any non-claimed element as essential.

Claims

1. A system for coupling biomass blending combustion with aluminum fuel energy storage in a coal-fired unit, characterized in that, The system comprises an Al2O3 electrolytic cell, an O2 condenser, a gas mixer, an aluminum powder reservoir, an Al-H2O reactor, an H2-H2O(g) separator, a biomass coal mill and a boiler body; The O2 outlet of the Al2O3 electrolytic cell is connected to the inlet of the O2 condenser, the O2 outlet of the O2 condenser is connected to the O2 inlet of the gas mixer, and the outlet of the gas mixer is connected to the overfire air nozzle of the boiler body; The aluminum particle outlet of the Al2O3 electrolytic cell is connected to the inlet of the aluminum powder reservoir, the outlet of the aluminum powder reservoir is connected to the inlet of the Al-H2O reactor, the outlet of the Al-H2O reactor is connected to the inlet of the H2-H2O(g) separator, the H2(g) outlet of the H2-H2O(g) separator is connected to the H2 burner nozzle of the boiler body, and the outlet of the biomass coal mill is connected to the biomass burner nozzle of the boiler body.

2. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 1, characterized in that, The Al2O3 electrolytic cell is used to produce O2 and aluminum particles by using redundant power generated by wind power and photovoltaic power generation.

3. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 1, characterized in that, The tail flue outlet of the boiler body is connected to a dust remover and a chimney in sequence.

4. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 3, characterized in that, An induced draft fan is arranged between the dust remover and the chimney.

5. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 1, characterized in that, An oxygen-enriched air storage tank is further included, and the outlet of the gas mixer is connected to the overfire air nozzle of the boiler body through the oxygen-enriched air storage tank 8.

6. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 1, characterized in that, An aluminum particle reservoir is further included, and the aluminum particle outlet of the Al2O3 electrolytic cell is connected to the inlet of the aluminum powder reservoir through the aluminum particle reservoir.

7. The system for coupling aluminum fuel energy storage to biomass cofiring in a coal-fired unit of claim 1, wherein, The H2O(g) outlet of the H2-H2O(g) separator is connected to the inlet of an H2O(g) condenser.

8. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 1, characterized in that, The H2(g) outlet of the H2-H2O(g) separator is connected to the biomass burner nozzle of the boiler body through an H2 induced draft fan.

9. The system for coupling biomass blending combustion with aluminum fuel energy storage of a coal-fired unit according to claim 1, characterized in that, A coal-fired burner nozzle is arranged above the biomass burner nozzle of the boiler body.

10. A method for coupling biomass blending combustion with aluminum fuel energy storage for a coal-fired unit, characterized in that, The method is based on the system for coupling biomass blending combustion of a coal-fired unit with aluminum fuel energy storage according to any one of claims 1 to 9, comprising: Redundant power generated by wind power and photovoltaic power generation is used to provide power for an Al2O3 electrolytic cell, and aluminum particles and O2 are prepared; Aluminum particles are crushed to obtain aluminum powder stored in an aluminum powder reservoir, and O2 is dried in an O2 condenser and then mixed with air in a gas mixer to obtain oxygen-enriched air; Part of the steam turbine extraction is chemically reacted with aluminum powder in an Al-H2O reactor to prepare Al2O3, and the mixed gas of H2 and H2O(g) is introduced into an H2-H2O(g) separator; H2(g) separated from the H2-H2O(g) separator is sent into the furnace combustion through an H2 combustion nozzle as a combustion-supporting fuel; Biomass fuel is crushed by a biomass coal mill and then sent into the furnace combustion through a biomass burner nozzle.

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