Coal-based solid waste disposal system and method coupled with brown coal boiler peak shaving by chemical looping combustion

Abstract

The application discloses a coal-based solid waste disposal system and method for chemical looping combustion coupled with lignite boiler peak shaving, and the system comprises an electrolytic water device, an air reactor, a fuel reactor, a gas mixer, a condenser, a semi-gasification stable combustion burner and a boiler body, etc.; the method utilizes the redundant power generation of wind power generation and photovoltaic power generation to electrolyze water in the electrolytic water device; H2 is introduced into the fuel reactor to react, so that the oxide carrier is reduced into a metal carrier, and water vapor is generated; the metal carrier in the air reactor is subjected to an oxidation reaction with air, so that the metal oxide is generated and a large amount of fuel is released; the gasification background gas is introduced into the air reactor to be preheated, and then is mixed with the water vapor generated in the fuel reactor, and finally the semi-coke powder in the semi-coke powder system is introduced into the semi-gasification stable combustion burner, and then is introduced into the furnace through the stable combustion burner nozzle to be stably combusted; part of the water vapor generated in the fuel reactor is introduced into the condenser to be condensed, so that condensed water is obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal chemical industry, and particularly relates to a coal-based solid waste disposal system and method for chemical looping combustion coupled with brown coal boiler peak shaving. BACKGROUND

[0002] The water content of brown coal in China is as high as 30%-50%. When directly combusted, the evaporation of water leads to a loss of 8%-12% of the thermal efficiency of the boiler, and the unit peak shaving rate is generally lower than 2% / min, which is difficult to match the stringent requirements of new energy high proportion power grid for flexibility. Under the framework of coal grading utilization, the preparation of semi-coke from brown coal pyrolysis can improve the fuel grade (heat value > 25 MJ / kg), but the powdery semi-coke produced by pyrolysis is not only unable to meet the strength standard of metallurgical coke (compressive strength < 5 MPa), but also difficult to be prepared into high value-added materials (specific surface area of formed body < 60 m 2 / g) through conventional forming process, with an annual accumulation of more than 8 million tons, and the traditional landfill disposal has environmental risks such as land occupation of more than 2,000 hectares / year and leaching concentration of heavy metals (As, Hg) exceeding the national standard by 2-3 times. The current technical route has multiple fragmentation: the pyrolysis process and the combustion system do not form energy and quality synergy, the characteristics of semi-coke are not well adapted to the subsequent utilization technology, the energy consumption of the crushing-forming process is as high as 1.8 GJ / ton and cannot improve its chemical inertness; the coal-fired unit is difficult to consume fluctuating renewable energy through rapid load response (rate < 3% / min); the coal-based solid waste disposal link is independent of the main process chain, and the components such as Fe2O3 and Al2O3 in the ash (content 35%-45%) are not converted into functional materials through component reconstruction, resulting in waste of valuable resources and secondary environmental pollution caused by landfill. The existing combustion technology attempts to improve the peak shaving capacity through staged combustion, but the water content fluctuation of brown coal causes poor combustion stability and low burnout rate of semi-coke fine powder (< 85%), and the correlation model of the physical and chemical properties of pyrolysis semi-coke and the combustion conditions is not established, resulting in a 10%-15% decrease in the overall energy efficiency of the system. More importantly, there is a lack of dynamic coupling mechanism for the synergy of new energy curtailed power hydrogen production and brown coal unit peak shaving, and the energy loss caused by pressure fluctuation in the hydrogen storage and transportation link is more than 12%, which restricts the economic efficiency of the multi-energy complementary system. SUMMARY

[0003] The present application provides a coal-based solid waste disposal system and method for chemical looping combustion coupled with brown coal boiler peak shaving, which aims to overcome the problems caused by the above technical bottlenecks that the brown coal utilization system is difficult to achieve the goals of deep peak shaving, solid waste resource utilization and green power consumption, therefore, it is urgent to innovate the multi-process energy and quality synergy regulation method.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] The coal-based solid waste disposal system of chemical looping combustion coupled with lignite boiler peak shaving comprises an electrolytic water device, an air reactor, a fuel reactor, a first air blower, a first gas mixer, a semi-coke pulverizing system, a condenser, a second gas mixer, a semi-gasification stable combustion burner, a stable combustion burner nozzle, a lignite burner nozzle, a overfire air nozzle and a boiler body;

[0006] The O2 outlet of the electrolytic water device is connected to the O2 inlet of the second gas mixer, the oxygen-enriched overfire air outlet of the second gas mixer is connected to the overfire air nozzle of the boiler body, the air reactor and the fuel reactor are connected to each other, the H2 outlet of the electrolytic water device is connected to the H2 inlet of the fuel reactor, the first water vapor outlet of the fuel reactor is connected to the inlet of the condenser, the second water vapor outlet of the fuel reactor is connected to the water vapor inlet of the first gas mixer, the outlet of the first air blower is connected to the primary air inlet of the air reactor, the primary air outlet of the air reactor is connected to the primary air inlet of the first gas mixer, and the outlet of the first gas mixer is connected to the stable combustion burner nozzle of the boiler body through the semi-coke pulverizing system and the semi-gasification stable combustion burner in sequence; and the lignite burner nozzle of the boiler body is connected to the outlet of the lignite pulverizing system.

[0007] The further improvement of the present application is that an O2 storage device is arranged at the O2 outlet of the electrolytic water device.

[0008] The further improvement of the present application is that an H2 storage device is arranged at the H2 outlet of the electrolytic water device.

[0009] The further improvement of the present application is that a water storage tank is arranged at the outlet of the condenser.

[0010] The further improvement of the present application is that a second air blower and an air preheater arranged at the tail of the flue of the boiler body are further included, and the second air blower is used for preheating the primary air, the secondary air and the overfire air into the air preheater.

[0011] The further improvement of the present application is that the primary air of the outlet of the air preheater is preheated into the air reactor and then into the lignite pulverizing system.

[0012] The further improvement of the present application is that a dust collector, an induced draft fan and a chimney are further included and connected in sequence at the tail of the flue of the boiler body.

[0013] The further improvement of the present application is that the stable combustion burner nozzle is arranged below the lignite burner nozzle.

[0014] The coal-based solid waste disposal method of chemical looping combustion coupled with lignite boiler peak shaving is based on the coal-based solid waste disposal system of chemical looping combustion coupled with lignite boiler peak shaving, and comprises the following steps:

[0015] The generated O2 and H2 are used to electrolyze water in a water electrolysis device;

[0016] The H2 is introduced into the fuel reactor to react, and the oxide carrier is reduced to a metal carrier to generate water vapor; and the metal carrier in the air reactor is oxidized with air to generate metal oxide and release a large amount of fuel;

[0017] The gasification background gas is introduced into the air reactor by the first air blower for preheating, and then mixed with the water vapor generated in the fuel reactor to finally send the semi-coke powder in the semi-coke powder system into the semi-gasification stable combustion burner, and then into the furnace through the stable combustion burner nozzle for stable combustion;

[0018] Part of the water vapor generated in the fuel reactor is introduced into the condenser for condensation to obtain condensed water;

[0019] O2 is partly collected as a chemical product, and the other part is mixed with air in the second gas mixer to obtain oxygen-enriched combustion air, which is finally sent into the furnace through the combustion air nozzle for combustion.

[0020] Further improvement of the present application is that it further comprises:

[0021] The flue gas generated by the combustion of the boiler body is dusted in the dust remover, and then exhausted through the induced draft fan and the chimney.

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

[0023] The coal-based solid waste disposal system and method for chemical looping combustion coupled with lignite boiler peak shaving provided by the present application uses new energy to produce hydrogen, stores energy, and then performs chemical looping combustion, which is safer for flameless combustion; part of the H2O(g) generated by the chemical looping combustion is used as a gasification agent for the stable combustion burner, and part of it is used as boiler makeup water; a large amount of heat released by the air reactor can preheat the primary air and the stable combustion burner gasification agent; the semi-coke is a lignite coal chemical product, and the boiler also burns lignite, so the increase of the primary air temperature can increase the drying output of the pulverizing system; the present application realizes flexible peak shaving of the lignite boiler by using green electricity, and optimizes the energy system. 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 following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. 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 - water electrolysis device, 2 - O2 reservoir, 3 - H2 reservoir, 4 - air reactor, 5 - fuel reactor, 6 - first air blower, 7 - first gas mixer, 8 - semi-coke pulverizing system, 9 - condenser, 10 - water storage tank, 11 - second gas mixer, 12 - semi-gasification stable combustion burner, 13 - stable combustion burner nozzle, 14 - lignite burner nozzle, 15 - overfire air nozzle, 16 - second air blower, 17 - air preheater, 18 - dust collector, 19 - induced draft fan, 20 - chimney, 21 - 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 merely for the convenience of describing the present application and simplifying the description, and therefore cannot be construed to 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 specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless specifically stated and limited otherwise, the "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. Moreover, the "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 horizontally higher than the second feature. The "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 horizontally lower than the second feature.

[0033] It should also be understood that the terms used in the specification of the present application are for the purpose of describing particular embodiments only and do not intend 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 be further 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 clear expression, and certain details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes, relative positions according to actual needs.

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

[0037] Embodiment 1

[0038] Reference Figure 1The coal-based solid waste disposal system of the chemical looping combustion coupled with lignite boiler peak shaving according to the application comprises an electrolytic water device 1, an O2 storage tank 2, an H2 storage tank 3, an air reactor 4, a fuel reactor 5, a first air blower 6, a first gas mixer 7, a semi-coke pulverizing system 8, a condenser 9, a water storage tank 10, a second gas mixer 11, a semi-gasification stable combustion burner 12, a stable combustion burner nozzle 13, a lignite burner nozzle 14, a overfire air nozzle 15, a second air blower 16, an air preheater 17, a dust remover 18, an induced draft fan 19, a chimney 20 and a boiler body 21, wherein the O2 outlet of the electrolytic water device 1 is connected to the O2 inlet of the second gas mixer 11, the oxygen-enriched overfire air outlet of the second gas mixer 11 is connected to the overfire air nozzle 15 of the boiler body 21, the air reactor 4 and the fuel reactor 5 are connected to each other, the H2 outlet of the electrolytic water device 1 is connected to the H2 inlet of the fuel reactor 5, the first water vapor outlet of the fuel reactor 5 is connected to the inlet of the condenser 9, the second water vapor outlet of the fuel reactor 5 is connected to the water vapor inlet of the first gas mixer 7, the outlet of the first air blower 6 is connected to the primary air inlet of the air reactor 4, the primary air outlet of the air reactor 4 is connected to the primary air inlet of the first gas mixer 7, and the outlet of the first gas mixer 7 is connected to the stable combustion burner nozzle 13 of the boiler body 21 in sequence through the semi-coke pulverizing system 8 and the semi-gasification stable combustion burner 12; and the lignite burner nozzle 14 of the boiler body 21 is connected to the outlet of a lignite pulverizing system.

[0039] The coal-based solid waste disposal system of the chemical looping combustion coupled with lignite boiler peak shaving according to the application comprises an electrolytic water device 1, an O2 storage tank 2, an H2 storage tank 3, an air reactor 4, a fuel reactor 5, a first air blower 6, a first gas mixer 7, a semi-coke pulverizing system 8, a condenser 9, a water storage tank 10, a second gas mixer 11, a semi-gasification stable combustion burner 12, a stable combustion burner nozzle 13, a lignite burner nozzle 14, a overfire air nozzle 15, a second air blower 16, an air preheater 17, a dust remover 18, an induced draft fan 19, a chimney 20 and a boiler body 21, wherein the O2 outlet of the electrolytic water device 1 is connected to the O2 inlet of the second gas mixer 11, the oxygen-enriched overfire air outlet of the second gas mixer 11 is connected to the overfire air nozzle 15 of the boiler body 21, the air reactor 4 and the fuel reactor 5 are connected to each other, the H2 outlet of the electrolytic water device 1 is connected to the H2 inlet of the fuel reactor 5, the first water vapor outlet of the fuel reactor 5 is connected to the inlet of the condenser 9, the second water vapor outlet of the fuel reactor 5 is connected to the water vapor inlet of the first gas mixer 7, the outlet of the first air blower 6 is connected to the primary air inlet of the air reactor 4, the primary air outlet of the air reactor 4 is connected to the primary air inlet of the first gas mixer 7, and the outlet of the first gas mixer 7 is connected to the stable combustion burner nozzle 13 of the boiler body 21 in sequence through the semi-coke pulverizing system 8 and the semi-gasification stable combustion burner 12; and the lignite burner nozzle 14 of the boiler body 21 is connected to the outlet of a lignite pulverizing system.

[0040] In the electrolytic water device 1, the electrolytic water is electrolyzed by the redundant power generation of renewable energy such as photovoltaic and wind power, and the generated O2(g) and H2(g) are respectively stored in the O2 reservoir 2 and the H2 reservoir 3. The O2 reservoir 2 is connected with the second gas mixer 11, and after being mixed with the burnout air, the oxygen-enriched burnout air is obtained, and then is sent into the furnace through the burnout air nozzle 15 for combustion. The H2 reservoir 3 is connected with the fuel reactor 5, and part of the generated H2O(g) is mixed with the preheated gasification background gas in the first gas mixer 7, and the other part is condensed in the condenser 9, and finally the H2O is collected in the water storage tank 10. The first gas mixer 7 is connected with the outlet of the semi-coke pulverizing system 8, and the semi-coke is sent into the semi-gasification stable combustion burner 12 through the direct blowing mode, and then is sent into the furnace through the stable combustion burner nozzle 13 for stable combustion. The air reactor 4 is connected with the fuel reactor 5, and the oxide carrier and the metal carrier move between the two according to the reaction needs. The first air blower 6 is connected with the air reactor 4, and a large amount of heat is released by the reaction in the air reactor 4 to preheat the gasification background gas; in addition, the primary air outlet of the air preheater 17 also enters the air reactor 4 for preheating, and then enters the lignite pulverizing system to improve the drying output of the lignite system. The stable combustion burner nozzle 13 is arranged below the lignite burner nozzle 14, and the heat released by the semi-gasification stable combustion is used to assist the combustion of lignite, thereby improving the low-load stable combustion capacity and flexible peak regulation capacity of the unit. The second air blower 16 sends the primary air, the secondary air and the burnout air into the air preheater 17 for preheating. The flue gas generated by the combustion of the boiler body 21 can be dusted in the dust remover 18, and then is discharged through the induced draft fan 19 and the chimney 20.

[0041] Example 2

[0042] The coal-based solid waste disposal method of the chemical looping combustion coupled with the peak regulation of the lignite boiler provided by the application has the operation steps as follows:

[0043] 1) The electrolytic water is electrolyzed in the electrolytic water device 1 by using the redundant power generation of wind power generation and photovoltaic power generation, and the generated O2(g) and H2(g) are respectively stored in the O2 reservoir 2 and the H2 reservoir 3.

[0044] 2) The H2(g) in the H2 reservoir 3 is sent into the fuel reactor 5 for reaction, the oxide carrier is reduced to the metal carrier, and H2O(g) is generated; and the metal carrier in the air reactor 4 is oxidized with air to generate metal oxide and release a large amount of fuel.

[0045] 3) The primary air after preheating by air preheater 17 is sent into air reactor 4 for secondary preheating to improve the drying output of lignite pulverizing system; the gasification background gas is sent into air reactor 4 by first air blower 6 for preheating, and then mixed with H2O(g) generated in fuel reactor 5, and finally the semi-coke powder in semi-coke pulverizing system 8 is sent into semi-gasification stable combustion burner 12, and then sent into the furnace through stable combustion burner nozzle 13 for stable combustion.

[0046] 4) Part of H2O(g) generated in fuel reactor 5 is sent into condenser 9 for condensation, and the obtained H2O(l) is collected in water storage tank 10.

[0047] 5) Part of O2(g) in O2 reservoir 2 is collected as a chemical product, and the other part is mixed with air in second gas mixer 11 to obtain oxygen-enriched combustion air, and finally sent into the furnace through combustion air nozzle 15 for combustion.

[0048] 6) The primary air, secondary air and combustion air are sent into air preheater 17 by second air blower 16 for preheating.

[0049] 7) The flue gas generated by the combustion of the boiler body 21 can be dusted in the dust collector 18, and then discharged through the induced draft fan 19 and the chimney 20.

[0050] The key points of the present application are:

[0051] The coal-based solid waste disposal system coupled with chemical looping combustion and lignite boiler peak shaving includes an electrolytic water device, an O2 reservoir, an H2 reservoir, an air reactor, a fuel reactor, a first air blower, a first gas mixer, a semi-coke pulverizing system, a condenser, a water storage tank, a second gas mixer, a semi-gasification stable combustion burner, a stable combustion burner nozzle, a lignite burner nozzle, a combustion air nozzle, a second air blower, an air preheater, a dust collector, an induced draft fan, a chimney and a boiler body.

[0052] The key point of the application is that the redundant electricity generated by new energy power generation can be used to prepare oxygen and hydrogen through water electrolysis, which is an efficient and environmentally friendly method. The water electrolysis process is not only mature in technology, but also can realize clean conversion and storage of energy. In the electrolysis process, water molecules are decomposed into oxygen and hydrogen under the action of electric current, and these two gases have wide application prospects. First, the prepared hydrogen gas, as a clean energy carrier, has a very high energy storage density, which can effectively store the redundant electricity generated by new energy power generation. This storage method not only solves the problem of intermittency and instability of new energy power generation, but also provides the possibility for flexible dispatching and efficient utilization of energy. Hydrogen can be further used for fuel cell power generation, transportation or as a chemical raw material, injecting new power into the green development of the economy and society. On the other hand, the prepared oxygen also has multiple utilization values. On the one hand, oxygen, as a basic raw material for chemical products, is widely used in medical, metallurgical, chemical and other fields, with large and stable market demand. On the other hand, we can mix the prepared oxygen with air to prepare oxygen-rich combustion air. This oxygen-rich combustion air can significantly improve the combustion efficiency of fuel in the boiler combustion process, reduce the emission of unburned carbon particles, and thus reduce the energy consumption and pollutant emissions of the boiler. This not only helps to improve the operating efficiency of the boiler, but also has important significance for environmental protection and energy saving and emission reduction. Therefore, using the redundant electricity generated by new energy power generation to prepare oxygen and hydrogen through water electrolysis not only realizes the effective utilization and energy storage of new energy, but also provides a green and efficient solution for chemical products and boiler combustion. This technical path meets the requirements of energy transformation and green development in the era, and has broad application prospects and promotional value.

[0053] The key point of the application is that the semi-gasification combustor can realize large-scale processing of powdered semi-coke, and also realize low-load stable combustion and flexible peak shaving of lignite units.

[0054] The key point of the application is that H2O(g) produced by chemical looping combustion can be added as a semi-coke semi-gasification background gas to improve the stable combustion performance of the semi-gasification combustor.

[0055] The key point of the application is that a large amount of heat generated by chemical looping combustion can be used to increase the primary air temperature, thereby increasing the drying capacity of the lignite pulverizing system, and to increase the temperature of the semi-coke semi-gasification background gas, thereby improving the stable combustion performance of the semi-gasification combustor.

[0056] The key point of the application is that H2O(g) produced by chemical looping combustion has a very high purity and can be condensed and collected as boiler makeup water.

[0057] The key point of the application is that the chemical looping combustion method is used to realize flameless combustion of H2(g), which not only has high safety, but also realizes clean and zero-carbon combustion.

[0058] The key point of the present application is that the coal-based solid waste is effectively treated, the organic coupling of lignite combustion and lignite chemical industry is realized, and the coal cascade efficient utilization and the flexibility peak shaving of lignite unit are promoted.

[0059] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0060] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made on the basis of the technical solutions according to the technical idea of the present application falls within the protection scope of the claims of the present application.

Claims

1. A coal-based solid waste treatment system for peak shaving in a chemical looping combustion coupled lignite boiler, characterized in that, It includes an electrolysis water device (1), an air reactor (4), a fuel reactor (5), a first blower (6), a first gas mixer (7), a semi-coke pulverizing system (8), a condenser (9), a second gas mixer (11), a semi-gasification stable combustion burner (12), a stable combustion burner nozzle (13), a lignite burner nozzle (14), a burnout air nozzle (15), and a boiler body (21); The O2 outlet of the water electrolysis device (1) is connected to the O2 inlet of the second gas mixer (11), the oxygen-enriched burnout air outlet of the second gas mixer (11) is connected to the burnout air nozzle (15) of the boiler body (21), the air reactor (4) and the fuel reactor (5) are interconnected, the H2 outlet of the water electrolysis device (1) is connected to the H2 inlet of the fuel reactor (5), the first steam outlet of the fuel reactor (5) is connected to the inlet of the condenser (9), and the second steam outlet of the fuel reactor (5) is connected to... The steam inlet of the first gas mixer (7) and the outlet of the first blower (6) are connected to the primary air inlet of the air reactor (4). The primary air outlet of the air reactor (4) is connected to the primary air inlet of the first gas mixer (7). The outlet of the first gas mixer (7) is connected to the stable combustion burner nozzle (13) of the boiler body (21) in sequence through the semi-coke pulverizing system (8) and the semi-gasification stable combustion burner (12). The lignite burner nozzle (14) of the boiler body (21) is connected to the outlet of the lignite pulverizing system.

2. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 1, characterized in that, An O2 storage device (2) is installed at the O2 outlet of the water electrolysis device (1).

3. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 1, characterized in that, An H2 storage device (3) is installed at the H2 outlet of the water electrolysis device (1).

4. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 1, characterized in that, A water storage tank (10) is provided at the outlet of the condenser (9).

5. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 1, characterized in that, It also includes a second blower (16) and an air preheater (17) installed at the tail end of the flue of the boiler body (21). The second blower (16) is used to preheat the primary air, secondary air and burnout air into the air preheater (17).

6. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 5, characterized in that, The primary air from the outlet of the air preheater (17) is fed into the air reactor (4) for preheating, and then fed into the lignite pulverizing system.

7. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 1, characterized in that, It also includes a dust collector (18), an induced draft fan (19) and a chimney (20) connected in sequence to the tail end of the flue of the boiler body (21).

8. The coal-based solid waste disposal system for peak shaving in a chemical looping combustion coupled lignite boiler according to claim 1, characterized in that, The stable combustion burner nozzle (13) is arranged below the lignite burner nozzle (14).

9. A method for disposing of coal-based solid waste from chemical looping combustion coupled with peak shaving in lignite boilers, characterized in that, This method is based on the coal-based solid waste disposal system for chemical looping combustion coupled with lignite boiler peak shaving, as described in any one of claims 1 to 8, comprising: The redundant power generated by wind power and photovoltaic power generation is used to electrolyze water in the water electrolysis device (1) to generate O2 and H2; H2 is introduced into the fuel reactor (5) to react and reduce the oxide carrier to the metal carrier, generating water vapor; while the metal carrier in the air reactor (4) reacts with the air to generate metal oxides and release a large amount of fuel. The gasification background gas is sent to the air reactor (4) through the first blower (6) for preheating, and then mixed with the water vapor generated in the fuel reactor (5). Finally, the semi-coke powder in the semi-coke pulverizing system (8) is sent to the semi-gasification stable combustion burner (12), and then sent into the furnace through the stable combustion burner nozzle (13) for stable combustion. Part of the water vapor generated in the fuel reactor (5) is fed into the condenser (9) for condensation to obtain condensate; O2 is collected as a chemical product, and the other part is mixed with air in the second gas mixer (11) to obtain oxygen-enriched burnout air, which is finally sent into the furnace for combustion through the burnout air nozzle (15).

10. The method for disposing of coal-based solid waste from a lignite boiler using chemical looping combustion coupled with peak shaving, as described in claim 9, is characterized in that... Also includes: The flue gas generated by the combustion of the boiler body (21) is purged in the dust collector (18) and then discharged through the induced draft fan (19) and the chimney (20).

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