Coal-based solid waste treatment system and method for coupling chemical looping combustion with peak regulation of lignite boiler

Abstract

The invention discloses a coal-based solid waste treatment system and method for coupling chemical looping combustion with peak regulation of a lignite boiler. The system comprises a water electrolysis device, an air reactor, a fuel reactor, a gas mixer, a condenser semi-gasification stable combustion burner, a boiler body and the like. According to the method, redundant generating capacity of wind power generation and photovoltaic power generation is utilized to electrolyze water in a water electrolysis device; h2 is introduced into the fuel reactor for reaction, the oxide carrier is reduced into a metal carrier, and water vapor is generated; a metal carrier in the air reactor is subjected to oxidation reaction with air to generate metal oxide and release a large amount of fuel; gasified background gas is fed into an air reactor for preheating and then is mixed with water vapor generated in a fuel reactor, and finally semi-coke powder in a semi-coke pulverizing system is fed into a semi-gasified stable-combustion combustor and then is fed into a hearth through a stable-combustion combustor nozzle for stable-combustion combustion; part of water vapor generated in the fuel reactor is introduced into a condenser for condensation, and condensate water and the like are obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal chemical engineering, and particularly relates to a coal-based solid waste disposal system and method for chemical-looping combustion coupled with peak shaving of lignite boilers. Background Art

[0002] The moisture content of lignite in China is as high as 30%-50%. When directly burned, the heat efficiency of the boiler is lost by 8%-12% due to water evaporation, and the peak shaving rate of the unit is generally lower than 2% / min, making it difficult to meet the stringent requirements of flexibility for a power grid with a high proportion of new energy. Under the framework of hierarchical utilization of coal, pyrolysis of lignite to prepare semicoke can improve the fuel grade (calorific value > 25 MJ / kg). However, the powdered semicoke produced as a by-product of pyrolysis has a fine particle size (D50 < 100 μm), a single pore structure (micropore proportion < 20%), and a lack of surface active sites (oxygen-containing functional groups < 0.5 mmol / g). It can neither meet the strength standard of metallurgical coke (compressive strength < 5 MPa) nor be easily used to prepare high-value-added materials through conventional forming processes (specific surface area of the formed body < 60 m 2 / g). The annual accumulation exceeds 8 million tons. Traditional landfill disposal has environmental risks such as occupying more than 2,000 hectares per year and the leaching concentration of heavy metals (As, Hg) exceeding the national standard by 2-3 times. There are multiple disconnections in the current technical routes: the pyrolysis process and the combustion system do not form energy and quality synergy, the characteristics of semicoke and the adaptability of subsequent utilization technologies are poor, the energy consumption of the crushing-forming process is as high as 1.8 GJ / ton and it cannot improve its chemical inertness; the insufficient peak shaving ability of thermal power and the problem of abandoned wind and light in the three-north regions (the abandoned electricity in 2023 was 34.7 billion kWh) form a negative feedback, and it is difficult for coal-fired units to absorb volatile renewable energy through rapid load response (rate < 3% / min); the coal-based solid waste disposal link is independent of the main process chain, and components such as Fe 2 O 3 、Al 2 O 3 and other components (content 35%-45%) are not transformed into functional materials through component reconstruction, and landfill leads to waste of valuable resources and secondary environmental pollution. Although existing combustion technologies have tried to improve the peak shaving ability through staged combustion, problems such as poor combustion stability caused by fluctuations in lignite moisture and low burnout rate of semicoke fine powder (< 85%) occur, and a correlation model between the physicochemical characteristics of pyrolyzed semicoke and combustion conditions has not been established, resulting in a 10%-15% decrease in the overall energy efficiency of the system. More prominently, there is a lack of a dynamic coupling mechanism for the synergy between hydrogen production from abandoned electricity of new energy and peak shaving of lignite units, and the energy loss caused by pressure fluctuations in the hydrogen storage and transportation link exceeds 12%, restricting the economy of the multi-energy complementary system. Summary of the Invention

[0003] The present invention provides a coal-based solid waste disposal system and method for chemical-looping combustion coupled with peak shaving of a lignite boiler, aiming to overcome the problem that it is difficult for the lignite utilization system to synergistically achieve the goals of deep peak shaving, solid waste resource utilization, and green power consumption due to the above-mentioned technical bottlenecks. Therefore, there is an urgent need to innovate the multi-process energy and mass synergy control method.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

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

[0006] The O 2 outlet of the electrolytic water device is connected to the O 2 inlet of the second gas mixer. The oxygen-rich 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 interconnected. The H 2 outlet of the electrolytic water device is connected to the H 2 inlet of the fuel reactor. The first steam outlet of the fuel reactor is connected to the inlet of the condenser. The second steam outlet of the fuel reactor is connected to the steam 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. The outlet of the first gas mixer is sequentially connected to the stable combustion burner of the boiler body through the semicoke pulverizing system and the semi-gasification stable combustion burner; the lignite burner nozzle of the boiler body is connected to the outlet of the lignite pulverizing system.

[0007] A further improvement of the present invention is that an O 2 storage tank is provided at the O 2 outlet of the electrolytic water device.

[0008] A further improvement of the present invention is that an H 2 storage tank is provided at the H 2 outlet of the electrolytic water device.

[0009] A further improvement of the present invention is that a water storage tank is provided at the outlet of the condenser.

[0010] A further improvement of the present invention is that it further includes a second air blower and an air preheater provided at the tail of the boiler body flue. The second air blower is used to pass the primary air, secondary air, and overfire air into the air preheater for preheating.

[0011] A further improvement of the present invention lies in that the primary air at the outlet of the air preheater is introduced into the air reactor for preheating and then into the lignite pulverizing system.

[0012] A further improvement of the present invention lies in that it further includes a dust collector, an induced draft fan, and a chimney that are sequentially connected to the tail of the flue of the boiler body.

[0013] A further improvement of the present invention lies in that the nozzles of the stable combustion burner are arranged below the nozzles of the lignite burner.

[0014] A method for disposing coal-based solid waste by chemical-looping combustion coupled with lignite boiler peak shaving, which is based on the coal-based solid waste disposal system of chemical-looping combustion coupled with lignite boiler peak shaving, includes:

[0015] Using the redundant power generation of wind power generation and photovoltaic power generation to electrolyze water in the electrolysis water device to generate O 2 and H 2 ;

[0016] H 2 is introduced into the fuel reactor for reaction to reduce the oxide carrier to a metal carrier and generate water vapor; while the metal carrier in the air reactor undergoes an oxidation reaction with air to generate metal oxides and release a large amount of fuel;

[0017] The gasification background gas is sent into the air reactor by the first forced draft fan for preheating, and then mixed with the water vapor generated in the fuel reactor. Finally, the semi-coke powder in the semi-coke pulverizing system is sent into the semi-gasification stable combustion burner and then sent into the furnace through the nozzles of the stable combustion burner 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] O 2 Part of it is collected as a chemical product, and the other part is mixed with air in the second gas mixer to obtain oxygen-enriched burnout air, which is finally sent into the furnace through the burnout air nozzles for combustion.

[0020] A further improvement of the present invention lies in that it further includes:

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

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

[0023] The coal-based solid waste disposal system and method of chemical-looping combustion coupled with lignite boiler peak shaving provided by the present invention use new energy to produce hydrogen and store energy, and then carry out chemical-looping combustion. Flameless combustion is safer; the H generated by chemical-looping combustion 2Part of O(g) serves as the gasifying agent of the stable combustion burner and part as the make-up water for the boiler; a large amount of heat released by the air reactor can preheat the primary air and the gasifying agent of the stable combustion burner; the semicoke is a product of lignite coal chemical industry, and the boiler also burns lignite. The increase in the primary air temperature can increase the drying capacity of the coal pulverizing system; the present invention realizes flexible peak shaving of the lignite boiler by using green electricity and optimizes the energy system. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

[0026] Description of the reference numerals in the drawings:

[0027] 1 - electrolyzer, 2 - O 2 storage tank, 3 - H 2 storage tank, 4 - air reactor, 5 - fuel reactor, 6 - first air blower, 7 - first gas mixer, 8 - semicoke coal pulverizing system, 9 - condenser, 10 - water storage tank, 11 - second gas mixer, 12 - semi-gasified stable combustion burner, 13 - stable combustion burner nozzle, 14 - lignite burner nozzle, 15 - burnout air nozzle, 16 - second air blower, 17 - air preheater, 18 - dust collector, 19 - induced draft fan, 20 - chimney, 21 - boiler body. Specific Embodiments

[0028] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0031] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

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

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

[0035] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These drawings are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual requirements.

[0036] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0037] Embodiment 1

[0038] Reference Figure 1 , the coal-based solid waste disposal system for chemical-looping combustion coupled with peak shaving of a lignite boiler according to the present invention includes an electrolyzer 1, an O 2 storage tank 2, an H 2 storage tank 3, an air reactor 4, a fuel reactor 5, a first forced draft fan 6, a first gas mixer 7, a semicoke 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, an overfire air nozzle 15, a second forced draft fan 16, an air preheater 17, a dust collector 18, an induced draft fan 19, a chimney 20, and a boiler body 21. Among them, the O 2 outlet of the electrolyzer 1 is connected to the O 2 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 H 2 outlet of the electrolyzer 1 is connected to the H 2 inlet of the fuel reactor 5, the first steam outlet of the fuel reactor 5 is connected to the inlet of the condenser 9, the second steam outlet of the fuel reactor 5 is connected to the steam inlet of the first gas mixer 7, the outlet of the first forced draft fan 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 sequentially connected to the stable combustion burner nozzle 13 of the boiler body 21 through the semicoke 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.

[0039] The coal-based solid waste disposal system for peak shaving of a chemical-looping combustion coupled lignite boiler according to the present invention has the following specific connection modes:

[0040] In the electrolyzer 1, redundant power generation from renewable energy sources such as photovoltaic and wind power is used for electrolyzing water to generate O 2 (g) and H 2 (g), which are respectively fed into the O 2 storage tank 2 and the H 2 storage tank 3 for storage. The O 2 storage tank 2 is connected to the second gas mixer 11, and after being mixed with the burnout air, oxygen-enriched burnout air is obtained, and then it is sent into the furnace through the burnout air nozzle 15 for combustion. The H 2 storage tank 3 is connected to the fuel reactor 5, and the generated H 2 O(g) is partly fed into the first gas mixer 7 to be mixed with the preheated gasification background gas, and the other part is fed into the condenser 9 for condensation, and finally the H 2 O is collected in the water storage tank 10. The first gas mixer 7 is connected to the outlet of the semicoke pulverizing system 8, and the semicoke is sent into the semi-gasification stable combustion burner 12 by the direct blowing method, and then sent into the furnace through the stable combustion burner nozzle 13 for stable combustion. The air reactor 4 and the fuel reactor 5 are interconnected, and the oxide carrier and the metal carrier move between them according to the reaction requirements. The first air blower 6 is connected to the air reactor 4, and a large amount of heat released from the reaction in the air reactor 4 is used to preheat the gasification background gas; in addition, the primary air at the outlet of the air preheater 17 is also fed into the air reactor 4 for preheating, and then fed into 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 from the semi-gasification stable combustion is used to assist the combustion of lignite, improving the low-load stable combustion capacity and flexible peak shaving capacity of the unit. The second air blower 16 feeds the primary air, secondary air and 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 collector 18 and then discharged through the induced draft fan 19 and the chimney 20.

[0041] Example 2

[0042] The method for disposing coal-based solid waste for peak shaving of a chemical-looping combustion coupled lignite boiler according to the present invention has the following operating steps:

[0043] 1) Using the redundant power generation of wind power generation and photovoltaic power generation to electrolyze water in the electrolyzer 1 to generate O 2 (g) and H 2 (g), which are respectively stored in the O 2 storage tank 2 and the H 2 storage tank 3.

[0044] 2) The H 2 in the H 2(g) It is introduced into the fuel reactor 5 for reaction to reduce the oxide support to a metal support, generating H 2 O(g); while the metal support in the air reactor 4 undergoes an oxidation reaction with air to form metal oxides and release a large amount of fuel.

[0045] 3) The primary air preheated by the air preheater 17 is introduced into the air reactor 4 for secondary preheating to improve the drying capacity of the lignite pulverizing system; the gasification background gas is sent into the air reactor 4 through the first blower 6 for preheating, and then mixed with the H 2 O(g) generated in the fuel reactor 5. Finally, the char powder in the char pulverizing system 8 is sent into the semi-gasification stable combustion burner 12, and then sent into the furnace through the stable combustion burner nozzle 13 for stable combustion.

[0046] 4) Part of the H 2 O(g) generated in the fuel reactor 5 is introduced into the condenser 9 for condensation, and the obtained H 2 O(l) is collected in the water storage tank 10.

[0047] 5) The O 2 in the O 2 storage 2 is partly collected as a chemical product, and the other part is mixed with air in the second gas mixer 11 to obtain oxygen-rich burnout air, which is finally sent into the furnace through the burnout air nozzle 15 for combustion.

[0048] 6) The second blower 16 sends the primary air, secondary air and burnout air into the air preheater 17 for preheating.

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

[0050] Key points of the present invention:

[0051] A coal-based solid waste disposal system for chemical-looping combustion coupled with peak shaving of a lignite boiler, comprising an electrolytic water device, an O 2 storage, an H 2 storage, an air reactor, a fuel reactor, a first blower, a first gas mixer, a char 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 burnout air nozzle, a second blower, an air preheater, a dust collector, an induced draft fan, a chimney and a boiler body.

[0052] The key point of the present invention is that the redundant electricity generated by new energy power generation can be used to prepare oxygen and hydrogen through the highly efficient and environmentally friendly method of electrolyzing water. The electrolysis of water process is not only technically mature but also enables clean energy conversion and storage. During the electrolysis process, water molecules are decomposed into oxygen and hydrogen under the action of an electric current, and both of these gases have broad application prospects. First of all, the prepared hydrogen, as a clean energy carrier, has an extremely high energy storage density and can effectively store the redundant electrical energy generated by new energy power generation. This storage method not only solves the problems of intermittency and instability of new energy power generation but also provides the possibility for flexible energy scheduling and efficient utilization. Hydrogen can be further used for fuel cell power generation, transportation, or as a chemical raw material, injecting new impetus into the green development of the economic society. On the other hand, the prepared oxygen also has multiple utilization values. On the one hand, as a basic raw material for chemical products, oxygen is widely used in multiple fields such as medical treatment, metallurgy, and chemical industry, with a large and stable market demand. On the other hand, we can mix the prepared oxygen with air to prepare oxygen-enriched burnout air. During the boiler combustion process, this oxygen-enriched burnout air can significantly improve the burnout efficiency of the fuel, 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 conservation and emission reduction. Therefore, using the redundant electricity of new energy power generation to prepare oxygen and hydrogen through electrolyzing water 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 the era of energy transformation and green development and has broad application prospects and promotion value.

[0053] The key point of the present invention is that the use of a semi-gasification burner can achieve the treatment of large-scale pulverized semicoke and also achieve stable combustion at low loads and flexible peak shaving of lignite units.

[0054] The key point of the present invention is that the H 2 O(g) generated by chemical-looping combustion can be added as the background gas for semicoke semi-gasification to improve the stable combustion performance of the semi-gasification burner.

[0055] The key point of the present invention is that a large amount of heat generated by chemical-looping combustion can, on the one hand, be used to increase the primary air temperature to improve the drying output of the lignite pulverizing system; on the other hand, it can increase the temperature of the semicoke semi-gasification background gas to improve the stable combustion performance of the semi-gasification burner.

[0056] The key point of the present invention is that the H 2 O(g) generated by chemical-looping combustion has a very high purity and can be condensed and collected as boiler make-up water.

[0057] The key point of the present invention is to use the chemical-looping combustion method to achieve H 2The flameless combustion of (g) not only has high safety but also achieves clean and zero-carbon combustion.

[0058] The key point of the present invention lies in the effective disposal of coal-based solid waste, realizing the organic coupling of lignite combustion and lignite coal chemical industry, and promoting the cascade efficient utilization of coal and the flexible peak shaving of lignite units.

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

[0060] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A coal-based solid waste disposal system with chemical looping combustion coupled with lignite boiler peak load regulation, characterized in that: It comprises a water electrolysis device (1), 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 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 connected to each other, the H2 outlet of the water electrolysis 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), and the second water vapor outlet of the fuel reactor (5) is connected to the The water vapor 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), and the outlet of the first gas mixer (7) is connected to the stabilizing burner nozzle (13) of the boiler body (21) through the semi-coke pulverizing system (8) and the semi-gasification stabilizing burner (12) in sequence; 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 chemical looping combustion coupled with lignite boiler peak load regulation according to claim 1 is characterized in that: An O2 storage tank (2) is provided at the O2 outlet of the water electrolysis device (1).

3. The coal-based solid waste disposal system for chemical looping combustion coupled with lignite boiler peak load regulation according to claim 1 is characterized in that: A H2 storage tank (3) is provided at the H2 outlet of the water electrolysis device (1).

4. The coal-based solid waste disposal system for chemical looping combustion coupled with lignite boiler peak load regulation according to claim 1 is 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 chemical looping combustion coupled with lignite boiler peak load regulation according to claim 1 is characterized in that: It also includes a second air blower (16) and an air preheater (17) arranged at the tail end of the flue of the boiler body (21), wherein the second air blower (16) is used to pass primary air, secondary air and burnt air into the air preheater (17) for preheating.

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

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

8. The coal-based solid waste disposal system for chemical looping combustion coupled with lignite boiler peak load regulation according to claim 1 is characterized in that: The combustion stabilizing burner nozzle (13) is arranged below the lignite burner nozzle (14).

9. A method for treating coal-based solid waste by coupling chemical looping combustion with peak load regulation of lignite boilers, characterized in that: The method is based on the coal-based solid waste disposal system for chemical looping combustion coupled with lignite boiler peak shaving according to any one of claims 1 to 8, comprising: Using the redundant power generated by wind power generation and photovoltaic power generation to electrolyze water in a water electrolysis device (1) to generate O2 and H2; H2 is introduced into the fuel reactor (5) to react, reducing the oxide carrier to a metal carrier and generating water vapor; while the metal carrier in the air reactor (4) undergoes an oxidation reaction with air to generate metal oxides and release a large amount of fuel; The gasified 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 powder making system (8) is sent to the semi-gasification stable combustion burner (12), and then sent to the furnace through the stable combustion burner nozzle (13) for stable combustion; Part of the water vapor generated in the fuel reactor (5) is passed into the condenser (9) for condensation to obtain condensed water; Part of the O2 is collected as a chemical product, and the other part is mixed with air in the second gas mixer (11) to obtain oxygen-rich burnout air, which is finally sent into the furnace through the burnout air nozzle (15) for combustion.

10. The method for treating coal-based solid wastes for peak load regulation of chemical looping combustion coupled with lignite boiler according to claim 9, characterized in that: Also includes: The flue gas generated by the combustion of the boiler body (21) is dedusted in the dust collector (18) and then discharged through the induced draft fan (19) and the chimney (20).

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