Household garbage pyrolysis system and method based on coal-fired power plant
By designing a domestic waste pyrolysis system in a coal-fired power plant, using a pyrolysis kiln to dry and pyrolysis to generate pyrolytic oil, gas and metal debris, combining coal-fired units to generate power, and recycling waste carbon and coal powder to mix combustion, the existing solution is solved The land occupation, high cost and pollution problems of garbage disposal methods have achieved harmless and low-cost garbage disposal effects.
Patent Information
- Application Number
- CN202411647030.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-01-10
AI Technical Summary
Existing garbage disposal methods such as landfill, compost and incineration have problems such as large land occupation, high cost, high pollution risk and limited application scope. In particular, incineration produces dioxins and toxic heavy metal fly ash, which is difficult to achieve harmlessness and low cost. disposal of domestic waste.
A domestic waste pyrolysis system based on coal-fired power plants is designed, including domestic waste silos, crushing devices, pyrolysis kilns, hot air furnaces and coal-fired units. The pyrolysis kilns are dried and pyrolysis to generate pyrolysis oil, gas and metal miscellaneous materials through pyrolysis kilns. pyrolytic oil and gas are coupled to coal-fired units to generate electricity, and metal debris and garbage carbon are screened and recovered and mixed with coal powder to achieve harmless disposal.
It has achieved harmless and low-cost disposal of domestic waste, utilized the energy resources of pyrolyzed oil and gas and garbage carbon, reduced energy supply demand, recycled metal debris and garbage carbon, and reduced pollutant emissions, which are suitable for promotion and application.
Smart Images
Figure CN119286548A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of solid waste disposal, and relates to a domestic waste pyrolysis system and method based on a coal-fired power plant. Background Art
[0002] Domestic waste can generally be divided into the following four categories: Recyclable waste: items that can be recycled and processed into production raw materials or can be reused after sorting. Mainly including waste paper (such as newspapers, cardboard, books, magazines, etc.), plastics (such as plastic beverage bottles, plastic oil drums, etc.), glass (such as glass bottles, flat glass, etc.), metals (such as aluminum cans, metal kitchen utensils, etc.), electronic waste (such as household electrical appliances) and fabrics (such as tablecloths, clothes, etc.). Kitchen waste: Kitchen waste in a narrow sense is a kind of organic waste, which is divided into cooked kitchen waste (such as leftovers, leftovers, vegetable leaves) and raw kitchen waste (such as fruit peels, eggshells, tea dregs, etc.). Kitchen waste in a broad sense also includes used chopsticks, food packaging materials, etc. Hazardous waste: waste that contains heavy metals, toxic substances that are harmful to human health, or that causes real or potential harm to the environment. Mainly including waste medicines, waste pesticides, waste disinfectants, waste paints, waste solvents, waste mineral oils, waste cosmetics, waste films, waste fluorescent tubes, waste batteries (such as rechargeable batteries, button batteries, etc.), etc. Other garbage: waste that is difficult to recycle except for the above types of garbage. Usually, it is treated by incineration or landfill according to the characteristics of the garbage. Mainly including used toilet paper, carbon paper, fax paper, photos, plastic glossy waste paper, sanitary napkins for women, baby diapers, paper towels, cigarette butts, ceramic products, clothes, shoes, tires, etc.
[0003] At present, the main methods of domestic waste disposal include landfill, composting, incineration and pyrolysis. Sanitary landfill is the main method of waste disposal in my country, but this method will occupy a lot of land resources, and the cost of leachate treatment is high, the risk of leakage is high, and it is easy to cause secondary pollution. Garbage composting is based on the classification and collection of garbage. my country's garbage is mainly mixed garbage, which is not suitable for direct composting. Therefore, this technology is difficult to promote. Incineration power generation is also an important means of its treatment, that is, placing the garbage in a high-temperature furnace to fully oxidize the combustible components. The heat energy generated after garbage incineration can be used to produce steam or electricity, and can also be used for heating or production needs. Incineration is the best way to achieve the three transformations of garbage treatment (harmlessness, reduction, and resource utilization). It can successfully reduce the volume by about 90%, save a lot of landfill space, and kill pathogens in the garbage. However, the investment is large, the capital occupation period is long, and there are certain requirements for the calorific value of garbage, and the scope of application is limited. Incineration can greatly reduce the volume of garbage, but garbage incineration will produce a large amount of dioxins. At the same time, the garbage fly ash produced contains toxic heavy metals and is a hazardous waste, which must be treated secondary. Therefore, it is urgent to propose a harmless and low-cost way to dispose of domestic garbage. Summary of the invention
[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a domestic waste pyrolysis system and method based on a coal-fired power plant, which can achieve harmless and low-cost treatment of domestic waste.
[0005] To achieve the above-mentioned purpose, the present invention discloses a domestic waste pyrolysis system based on a coal-fired power plant, comprising a domestic waste bin, a crushing device, a pyrolysis kiln, a hot blast furnace and a coal-fired unit;
[0006] The outlet of the domestic waste bin is connected to the inlet of the crushing device; the outlet of the crushing device is connected to the material inlet of the pyrolysis kiln; the pyrolysis oil and gas outlet of the pyrolysis kiln is respectively connected to the inlet of the hot blast furnace and the burner inlet of the coal-fired unit; the flue gas extraction port of the coal-fired unit is connected to the inlet of the hot blast furnace; the outlet of the hot blast furnace is connected to the hot air inlet of the pyrolysis kiln.
[0007] As a further improvement of the domestic waste pyrolysis system based on a coal-fired power plant of the present invention,
[0008] Furthermore, the outlet of the domestic waste bin is connected to the inlet of the crushing device via a primary conveying device.
[0009] Furthermore, the outlet of the crushing device is connected to the material inlet of the pyrolysis kiln through the secondary conveying device.
[0010] Furthermore, the smoke extraction port of the coal-fired unit is connected to the inlet of the hot blast furnace via a fan.
[0011] Furthermore, the material outlet of the pyrolysis kiln is connected to the inlet of the screening device; the metal material outlet of the screening device is connected to the inlet of the metal screening bin; and the garbage carbon outlet of the screening device is connected to the inlet of the garbage carbon bin.
[0012] Furthermore, the outlet of the coal-fired unit is connected to a flue gas treatment device, and the pyrolysis oil gas enters the furnace and burns, and then the pollutants are removed by the flue gas treatment device.
[0013] Furthermore, the flue gas pipeline between the fan and the hot blast furnace serves as a heating pipeline from the pyrolysis oil gas of the pyrolysis kiln to the pyrolysis flue gas pipeline of the coal-fired unit.
[0014] The present invention discloses a method for pyrolyzing domestic waste based on a coal-fired power plant, comprising the following steps:
[0015] The domestic waste in the domestic waste bin is transported to the crushing device. After the domestic waste is completely crushed in the crushing device, the crushed domestic waste is transported to the pyrolysis kiln. At the same time, the hot blast furnace sends high-temperature flue gas to the pyrolysis kiln. The crushed domestic waste is dried and pyrolyzed inside the pyrolysis kiln. Finally, the domestic waste is dried and pyrolyzed in the pyrolysis kiln to generate pyrolysis oil gas, metal debris and garbage carbon. Among them, the generated pyrolysis oil gas is divided into two parts after coming out of the pyrolysis kiln. Among them, one part of the pyrolysis oil gas is sent to the coal-fired unit for coupled combustion and power generation, and the other part enters the hot blast furnace for combustion, so that the hot blast furnace can continuously generate high-temperature flue gas to provide a heat source for the drying and pyrolysis of domestic waste;
[0016] Medium-temperature flue gas is extracted from the flue gas outlet of the coal-fired unit and divided into two paths. One path is used as the heating for the pyrolysis oil and gas pipeline at the outlet of the pyrolysis kiln, and the other path provides part of the circulating heat source for the hot blast furnace.
[0017] As a further improvement of the method for pyrolyzing domestic waste based on a coal-fired power plant of the present invention,
[0018] Furthermore, the material outlet of the pyrolysis kiln is connected to the inlet of the screening device; the metal material outlet of the screening device is connected to the inlet of the metal screening bin; and the garbage carbon outlet of the screening device is connected to the inlet of the garbage carbon bin.
[0019] Furthermore, the metal debris and garbage carbon generated by the pyrolysis kiln are transported to the screening device for screening into metal debris and garbage carbon, wherein the metal debris is sent to the screening device for further screening and recovery, and the garbage carbon is sent to the garbage carbon bin for storage so that it can be mixed with coal powder at any time and enter the coal-fired unit for combustion and power generation.
[0020] The present invention has the following beneficial effects:
[0021] The domestic waste pyrolysis system and method based on a coal-fired power plant described in the present invention utilizes the energy generated by the combustion of pyrolysis oil and gas as a heat source during specific operation, has a small external energy supply demand, and can recover metal debris and garbage carbon generated during the pyrolysis process. In addition, not only can the pyrolysis oil and gas be sent to the coal-fired unit for coupled power generation, but the recovered garbage carbon can also be mixed with coal powder for power generation after screening, thereby achieving harmless and low-cost disposal of domestic waste, which is highly practical and easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:
[0023] Figure 1 It is a schematic diagram of the structure of the present invention.
[0024] Among them, 1 is a domestic waste bin, 2 is a primary conveying device, 3 is a crushing device, 4 is a secondary conveying device, 5 is a pyrolysis kiln, 6 is a hot air furnace, 7 is a coal-fired unit, 8 is a fan, 9 is a flue gas treatment device, 10 is a screening device, 11 is a metal screening bin, and 12 is a garbage carbon bin. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0026] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.
[0027] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0028] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.
[0029] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.
[0030] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.
[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0032] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.
[0033] Embodiment 1
[0034] refer to Figure 1 The domestic waste pyrolysis system based on a coal-fired power plant of the present invention comprises a domestic waste bin 1, a crushing device 3, a pyrolysis kiln 5, a hot blast furnace 6 and a coal-fired unit 7;
[0035] The outlet of the domestic garbage bin 1 is connected to the inlet of the crushing device 3; the outlet of the crushing device 3 is connected to the material inlet of the pyrolysis kiln 5; the pyrolysis oil and gas outlet of the pyrolysis kiln 5 is respectively connected to the inlet of the hot blast stove 6 and the burner inlet of the coal-fired unit 7; the smoke extraction port of the coal-fired unit 7 is connected to the inlet of the hot blast stove 6; the outlet of the hot blast stove 6 is connected to the hot air inlet of the pyrolysis kiln 5. The material outlet of the pyrolysis kiln 5 is connected to the inlet of the screening device 10; the metal material outlet of the screening device 10 is connected to the inlet of the metal screening bin 11; the garbage carbon outlet of the screening device 10 is connected to the inlet of the garbage carbon bin 12.
[0036] The method for pyrolyzing domestic waste based on a coal-fired power plant of the present invention is implemented based on the pyrolyzing system for domestic waste based on a coal-fired power plant. The pyrolyzing system for domestic waste based on a coal-fired power plant comprises a domestic waste bin 1, a crushing device 3, a pyrolysis kiln 5, a hot blast furnace 6 and a coal-fired unit 7. The method for pyrolyzing domestic waste based on a coal-fired power plant comprises the following steps:
[0037] The domestic waste in the domestic waste bin 1 is transported to the crushing device 3. After the domestic waste is completely crushed in the crushing device 3, the crushed domestic waste is transported to the pyrolysis kiln 5. At the same time, the hot blast furnace 6 sends high-temperature flue gas to the pyrolysis kiln 5. The crushed domestic waste is dried and pyrolyzed inside the pyrolysis kiln 5. Finally, the domestic waste is dried and pyrolyzed in the pyrolysis kiln 5 to generate pyrolysis oil gas, metal impurities and garbage carbon. The generated pyrolysis oil gas is divided into two parts after coming out of the pyrolysis kiln 5. One part of the pyrolysis oil gas is sent to the coal-fired unit 7 for coupled combustion and power generation, and the other part enters the hot blast furnace 6 for combustion, so that the hot blast furnace 6 can continuously generate high-temperature flue gas to provide a heat source for the drying and pyrolysis of domestic waste;
[0038] Medium-temperature flue gas is extracted from the flue gas outlet of the coal-fired unit 7 and then divided into two paths, one of which is used as heating for the pyrolysis oil and gas pipeline at the outlet of the pyrolysis kiln 5, and the other is used to provide a partial circulating heat source for the hot blast furnace 6.
[0039] The metal debris and garbage carbon generated by the pyrolysis kiln 5 are transported to the screening device 10 for screening into metal debris and garbage carbon, wherein the metal debris is sent to the screening device 10 for further screening and recovery, and the garbage carbon is sent to the garbage carbon bin 12 for storage so that it can be mixed with coal powder at any time and then enter the coal-fired unit 7 for combustion and power generation.
[0040] Embodiment 2
[0041] refer to Figure 1 The domestic waste pyrolysis system based on a coal-fired power plant of the present invention comprises a domestic waste bin 1, a primary conveying device 2, a crushing device 3, a secondary conveying device 4, a pyrolysis kiln 5, a hot blast stove 6, a coal-fired unit 7, a fan 8, a flue gas treatment device 9, a screening device 10, a metal screening bin 11 and a waste carbon bin 12;
[0042] The outlet of the domestic waste bin 1 is connected to the inlet of the primary conveying device 2; the outlet of the primary conveying device 2 is connected to the inlet of the crushing device 3; the outlet of the crushing device 3 is connected to the inlet of the secondary conveying device 4; the outlet of the secondary conveying device 4 is connected to the material inlet of the pyrolysis kiln 5; the pyrolysis oil and gas outlet of the pyrolysis kiln 5 is respectively connected to the inlet of the hot blast stove 6 and the burner inlet of the coal-fired unit 7; the flue gas extraction port of the coal-fired unit 7 is connected to the inlet of the fan 8; the outlet of the fan 8 is connected to the inlet of the hot blast stove 6; the outlet of the hot blast stove 6 is connected to the hot air inlet of the pyrolysis kiln 5.
[0043] As an embodiment of the present invention, the material outlet of the pyrolysis kiln 5 is connected to the inlet of the screening device 10; the metal material outlet of the screening device 10 is connected to the inlet of the metal screening bin 11; the garbage carbon outlet of the screening device 10 is connected to the inlet of the garbage carbon bin 12.
[0044] As an embodiment of the present invention, the outlet of the coal-fired unit 7 is connected to the flue gas treatment device 9, and the pyrolysis oil gas enters the furnace and burns, and then the pollutants are removed by the flue gas treatment device 9.
[0045] As an embodiment of the present invention, the flue gas pipeline between the fan 8 and the hot blast furnace 6 serves as a heating pipeline from the pyrolysis oil gas of the pyrolysis kiln 5 to the pyrolysis flue gas pipeline of the coal-fired unit 7 .
[0046] Accordingly, the present invention provides a method for pyrolyzing domestic waste based on a coal-fired power plant. The method for pyrolyzing domestic waste based on a coal-fired power plant is implemented based on the pyrolyzing system for domestic waste based on a coal-fired power plant. The pyrolyzing system for domestic waste based on a coal-fired power plant includes a domestic waste bin 1, a primary conveying device 2, a crushing device 3, a secondary conveying device 4, a pyrolysis kiln 5, a hot blast furnace 6, a coal-fired unit 7, a fan 8, a flue gas treatment device 9, a screening device 10, a metal screening bin 11 and a garbage carbon bin 12. The method for pyrolyzing domestic waste based on a coal-fired power plant includes the following steps:
[0047] The domestic waste in the domestic waste bin 1 is transported to the crushing device 3 through the primary conveying device 2. After the domestic waste is completely crushed in the crushing device 3, the crushed domestic waste is transported to the pyrolysis kiln 5 from the material inlet of the pyrolysis kiln 5 through the secondary conveying device 4. At the same time, the hot blast furnace 6 sends 800°C high-temperature flue gas to the pyrolysis kiln 5, and the crushed domestic waste is dried and pyrolyzed inside the pyrolysis kiln 5. Finally, the domestic waste is dried and pyrolyzed in the pyrolysis kiln 5 to generate pyrolysis oil and gas, metal impurities and garbage carbon. Among them, the generated pyrolysis oil and gas are divided into two parts after coming out of the pyrolysis kiln 5, among which one part of the pyrolysis oil and gas is sent to the coal-fired unit 7 for coupled combustion and power generation, and the other part enters the hot blast furnace 6 for combustion, so that the hot blast furnace 6 can continuously generate high-temperature flue gas to provide a heat source for the drying and pyrolysis of domestic waste. The temperature of the high-temperature flue gas is not less than 800°C.
[0048] The flue gas discharged from the coal-fired unit 7 is discharged after pollutants are removed by the flue gas treatment device 9.
[0049] Medium-temperature flue gas at 500°C is extracted from the flue gas outlet of the coal-fired unit 7 through the fan 8 and then divided into two paths. One path is used as the heating for the pyrolysis oil and gas pipeline at the outlet of the pyrolysis kiln 5 to avoid deposition, coking and blockage of the pyrolysis oil and gas during pipeline transportation. On the other hand, it provides part of the circulating heat source for the hot blast furnace 6.
[0050] The metal debris and garbage carbon generated by the pyrolysis kiln 5 are transported to the screening device 10 for screening into metal debris and garbage carbon, wherein the metal debris is sent to the screening device 10 for further screening and recovery, and the garbage carbon is sent to the garbage carbon bin 12 for storage so that it can be mixed with coal powder at any time and then enter the coal-fired unit 7 for combustion and power generation.
[0051] It should be noted that the present invention utilizes the high-temperature flue gas of the boiler as the heat source for garbage drying and pyrolysis, and couples the pyrolysis oil gas and garbage carbon generated after drying and pyrolysis of domestic garbage with a coal-fired power plant, which not only treats domestic garbage, but also eliminates the flue gas pollutants generated during the direct combustion of garbage.
[0052] The present invention uses a coal-fired power plant coupled with pyrolysis to dispose of domestic waste, which not only ensures that no pollutants are discharged during the disposal of domestic waste, but also uses the energy of pyrolysis oil and gas combustion as a heat source, consuming less energy. In addition, the system can effectively separate the metal debris and garbage carbon produced by pyrolysis, further improving the energy-saving and environmental protection benefits, and providing certain technical support for the construction of energy-saving, carbon-reducing, and recycling domestic waste disposal systems.
[0053] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.
[0054] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. A domestic waste pyrolysis system based on a coal-fired power plant, characterized in that: It comprises a domestic garbage bin (1), a crushing device (3), a pyrolysis kiln (5), a hot air stove (6) and a coal-fired unit (7); The outlet of the domestic waste bin (1) is connected to the inlet of the crushing device (3); the outlet of the crushing device (3) is connected to the material inlet of the pyrolysis kiln (5); the pyrolysis oil and gas outlet of the pyrolysis kiln (5) is respectively connected to the inlet of the hot blast furnace (6) and the burner inlet of the coal-fired unit (7); the smoke extraction port of the coal-fired unit (7) is connected to the inlet of the hot blast furnace (6); and the outlet of the hot blast furnace (6) is connected to the hot blast inlet of the pyrolysis kiln (5).
2. The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 is characterized in that: The outlet of the domestic garbage bin (1) is connected to the inlet of the crushing device (3) via the primary conveying device (2).
3. The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 is characterized in that: The outlet of the crushing device (3) is connected to the material inlet of the pyrolysis kiln (5) via the secondary conveying device (4).
4. The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 is characterized in that: The smoke extraction port of the coal-fired unit (7) is connected to the inlet of the hot blast furnace (6) via the fan (8).
5. The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 is characterized in that: The material outlet of the pyrolysis kiln (5) is connected to the inlet of the screening device (10); the metal material outlet of the screening device (10) is connected to the inlet of the metal screening bin (11); and the garbage carbon outlet of the screening device (10) is connected to the inlet of the garbage carbon bin (12).
6. The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 is characterized in that: The outlet of the coal-fired unit (7) is connected to the flue gas treatment device (9), and the pyrolysis oil gas enters the furnace and is burned, and then the pollutants are removed by the flue gas treatment device (9).
7. The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 is characterized in that: The flue gas pipeline between the fan (8) and the hot blast furnace (6) serves as a heating pipeline from the pyrolysis oil gas of the pyrolysis kiln (5) to the pyrolysis flue gas pipeline of the coal-fired unit (7).
8. A method for pyrolysis of domestic waste based on a coal-fired power plant, characterized in that: The domestic waste pyrolysis system based on a coal-fired power plant according to claim 1 comprises the following steps: The domestic waste in the domestic waste bin (1) is transported to the crushing device (3). After the domestic waste is completely crushed in the crushing device (3), the crushed domestic waste is transported to the pyrolysis kiln (5). At the same time, the hot blast furnace (6) sends high-temperature flue gas to the pyrolysis kiln (5). The crushed domestic waste is dried and pyrolyzed inside the pyrolysis kiln (5). Finally, the domestic waste is dried and pyrolyzed in the pyrolysis kiln (5) to generate pyrolysis oil gas, metal impurities and garbage carbon. The generated pyrolysis oil gas is divided into two parts after coming out of the pyrolysis kiln (5). One part of the pyrolysis oil gas is sent to the coal-fired unit (7) for coupled combustion and power generation, and the other part enters the hot blast furnace (6) for combustion, so that the hot blast furnace (6) can continuously generate high-temperature flue gas to provide a heat source for the drying and pyrolysis of the domestic waste. Medium-temperature flue gas is extracted from the flue gas outlet of the coal-fired unit (7) and divided into two paths, one of which is used as heating for the pyrolysis oil and gas pipeline at the outlet of the pyrolysis kiln (5), and the other is used to provide a partial circulating heat source for the hot blast furnace (6).
9. The method for pyrolysis of domestic waste based on a coal-fired power plant according to claim 8, characterized in that: The material outlet of the pyrolysis kiln (5) is connected to the inlet of the screening device (10); the metal material outlet of the screening device (10) is connected to the inlet of the metal screening bin (11); and the garbage carbon outlet of the screening device (10) is connected to the inlet of the garbage carbon bin (12).
10. The method for pyrolysis of domestic waste based on a coal-fired power plant according to claim 9, characterized in that: The metal debris and garbage carbon generated by the pyrolysis kiln (5) are transported to a screening device (10) for screening into metal debris and garbage carbon, wherein the metal debris is sent to the screening device (10) for further screening and recovery, and the garbage carbon is sent to a garbage carbon bin (12) for storage so that it can be mixed with coal powder at any time and then enter the coal-fired unit (7) for combustion and power generation.