A garbage pyrolysis gasification coupling cyclone furnace blending burning treatment system and method

Abstract

This invention discloses a waste pyrolysis gasification coupled cyclone furnace co-firing system and method. Utilizing waste pyrolysis gasification technology and the heat from flue gas in a power plant boiler, the system reduces NO produced during combustion by injecting reducing gases generated during pyrolysis gasification into the cyclone furnace. x Furthermore, by utilizing the high-temperature environment and liquid ash discharge technology of the cyclone furnace, complete degradation of dioxins from waste combustion and comprehensive treatment and utilization of ash can be achieved. This enables large-scale harmless treatment of waste in the cyclone furnace, reducing waste treatment costs and improving waste utilization efficiency while simultaneously addressing the NOx emissions from the cyclone furnace. x Addressing challenges such as emissions and waste ash disposal, this invention leverages the complementary principles of fuel characteristics and the advantages of cyclone furnaces to achieve large-scale, efficient, and clean combustion of low-volatile, difficult-to-burn, or high-alkali metal fuels. This will improve the economic benefits of power plants while advancing their carbon emission reduction process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of thermal power generation and waste disposal, and particularly relates to a low-NOx emission waste pyrolysis and gasification coupled cyclone furnace. x The waste harmless treatment system and method. BACKGROUND

[0002] At present, the main disposal methods of domestic waste are landfill, composting and incineration pyrolysis and gasification. Among them, waste incineration has been rapidly developed in recent years due to its obvious reduction and small land occupation, and the annual amount of domestic waste treated reaches 122 million tons. However, while the waste incineration technology can efficiently dispose of waste, it also emits SO2 and NOx, conventional pollutants, and dioxins and heavy metals, characteristic pollutants, causing serious "not in my backyard" effect. HCl and dioxins are both chlorine-containing pollutants generated by incineration technology. HCl not only seriously harms human body, but also causes universal corrosion of the heated surface, thereby limiting the steam parameters and power generation efficiency of waste incineration power plants. The secondary pollution problem caused by waste incineration has become a bottleneck for the development of waste incineration technology, and has seriously restricted the process of municipal domestic waste disposal. x

[0003] How to achieve rapid emission reduction and enhance the survival ability of enterprises is a problem to be solved for coal-fired units at present. Coupling combustion of continuously generated waste and coal in a large coal-fired unit is a promising technology for efficient waste disposal and CO2 emission reduction of coal-fired units, which can improve the efficiency of waste power generation, reduce the consumption of fossil fuels of coal-fired units, promote the carbon emission reduction process, achieve large-scale waste disposal under low blending ratio conditions, reduce the emission of pollutants such as CO, NOx and dioxins, and avoid asset idling of coal-fired units and repeated investment of waste incineration power plants. Therefore, the coal and waste coupled combustion technology can realize efficient and clean waste resource disposal and low carbon emission, and has good social and environmental benefits. x

[0004] However, for traditional solid slag discharge boilers, waste coupling utilization will inevitably cause an increase in the emission of dioxins and heavy metals, characteristic pollutants, resulting in an increase in the difficulty of handling coal fly ash and a decrease in the efficiency of ash utilization, and causing problems such as "not in my backyard" effect and a decrease in ash benefits. The cyclone combustion technology of liquid slag can not only achieve complete decomposition of dioxins in flue gas at ultra-high temperature, but also can realize melting and solidification of ash through ash capture in the cyclone furnace and fly ash return to the furnace for collaborative treatment, achieving harmless treatment of dioxins and heavy metals in ash, solving the problem of ash utilization of coal and waste coupled combustion, and having great development and application prospect. However, the NOx emission of the cyclone furnace under traditional air combustion conditions is too high to meet the increasingly stringent pollutant emission requirements. x SUMMARY ​​​

[0005] In view of the problems in the prior art, the present application provides a waste pyrolysis gasification coupled cyclone furnace low-NO x The harmless treatment system and method by blending burning solves the problems of low-NO x x emission, waste ash treatment and the like by combining waste pyrolysis gasification technology with cyclone combustion technology, spraying waste pyrolysis gas into a cyclone furnace to reduce NO x x emission, and realizing waste harmless treatment by high temperature in the cyclone furnace, thereby reducing waste treatment cost, improving waste utilization efficiency and solving the problems of low-NO x x emission, waste ash treatment and the like.

[0006] The present application is realized by the following technical solutions:

[0007] A waste pyrolysis gasification coupled cyclone furnace low-NO x x emission system by blending burning, comprising a pyrolysis gasification furnace, a waste burner, a cyclone furnace, a coal mill, a granulation pool, a boiler body and an air preheater,

[0008] The waste carbon outlet of the pyrolysis gasification furnace is connected with the waste burner through a pipeline; the waste pyrolysis gas outlet of the pyrolysis gasification furnace is connected with the cyclone furnace through a pipeline, and the cyclone furnace is installed at the bottom of the boiler body; the air preheater is installed in the tail flue of the boiler body; an air supply fan is arranged at the inlet of the air preheater; the outlet of the coal mill is connected with a coal / powder burner through a pipeline, and the inlet of the coal mill is connected with the outlet of the air preheater through a pipeline; the waste burner is arranged at the waste carbon primary air injection port of the cyclone furnace, and the coal / powder burner is arranged at the coal / powder primary air inlet of the cyclone furnace; and the granulation pool is arranged at the bottom of the hearth of the boiler body.

[0009] Preferably, a high-temperature combustion zone, a NO x x reduction zone and a burnout zone are arranged in the cyclone furnace, the waste burner is communicated with the high-temperature combustion zone of the cyclone furnace, the waste pyrolysis gas outlet of the pyrolysis gasification furnace is connected with the injection port on the cyclone furnace through a pipeline, and the injection port is arranged on the NO x x reduction zone of the cyclone furnace.

[0010] Preferably, a slag tapping hole is arranged at the bottom of the hearth of the boiler body, the slag tapping hole is communicated with the burnout zone of the cyclone furnace, and the granulation pool is arranged at the bottom of the slag tapping hole.

[0011] Preferably, a secondary air injection port is further arranged on the high-temperature combustion zone in the cyclone furnace, and the secondary air injection port is connected with the secondary air outlet of the air preheater through a pipeline.

[0012] Preferably, the primary air outlet of the air preheater is connected with the coal mill in one way and connected with the pyrolysis gasification furnace in another way.

[0013] Preferably, a high-temperature circulating fan is arranged between the furnace flue of the boiler body and the pyrolysis gasifier; a circulating flue gas extraction point is arranged in the furnace flue of the boiler body, the high-temperature circulating fan extracts flue gas at the circulating flue gas extraction point, and the temperature in the furnace flue is 700-800℃.

[0014] Preferably, a hopper is arranged at the inlet of the pyrolysis gasifier; garbage in the hopper is sent into the pyrolysis gasifier through a screw feeder, and the screw feeder is installed at the bottom of the hopper and the pyrolysis gasifier.

[0015] Preferably, the system further comprises a garbage storage pit and a garbage crusher, garbage in the garbage storage pit is crushed in the garbage crusher, and then is sent into the pyrolysis gasifier through the hopper.

[0016] Preferably, a plurality of cyclone furnaces can be arranged according to the actual capacity of the power plant and the fuel characteristics, and are distributed on both sides of the boiler body.

[0017] A garbage pyrolysis gasification coupled cyclone furnace low-NO x The harmless treatment method comprises,

[0018] S1, garbage is sent into a pyrolysis gasifier to perform pyrolysis gasification, pyrolysis gas obtained by pyrolysis is sent into a cyclone furnace, and NO generated in the cyclone combustion is reduced x , and the reduced NO is burned in the furnace of the boiler body, and garbage char obtained by pyrolysis is burned in the cyclone furnace through primary air generated by an air preheater;

[0019] S2, coal is ground by a coal mill, and then is burned in the cyclone furnace through primary air generated by the air preheater,

[0020] S3, the coal and the garbage char are high-temperature melted in the cyclone furnace, characteristic pollutants generated by garbage combustion are completely degraded at high temperature, a slag film in a molten state adhered to the inner wall of the cyclone furnace flows into a granulation pool, and heavy metal pollutants in solidified ash slag are treated, so that the garbage is harmlessly treated.

[0021] Compared with the prior art, the application has the following beneficial technical effects:

[0022] The application aims to provide a garbage pyrolysis gasification coupled cyclone furnace low-NO x The harmless treatment system and method can realize large-scale harmless treatment of garbage in the cyclone furnace, reduce garbage treatment cost, improve garbage utilization efficiency, and solve the problems of NO x emission of the cyclone furnace, garbage ash treatment, and the like. The application utilizes garbage pyrolysis gasification technology, utilizes the heat of flue gas in a power plant boiler, reduces NO x; and through the high-temperature environment of the cyclone furnace and the liquid slagging technology, complete degradation of dioxin generated by waste incineration and comprehensive treatment and utilization of the ash are realized. In addition, the present application will utilize the complementary principle of fuel characteristics and the advantages of the cyclone furnace to realize large-scale and efficient clean combustion of low-volatile and difficult-to-burn or high-alkali fuel, improve the economic benefit of the power plant, and promote the carbon emission reduction process. The present application combines the waste pyrolysis gasification technology with the cyclone combustion technology, sprays the waste pyrolysis gas into the cyclone furnace to reduce the generation of NO x , and realizes the harmless treatment of waste by means of high temperature in the cyclone furnace.

[0023] Further, the system of the present application couples the waste pyrolysis gasifier and the large-scale cyclone coal-fired unit to realize the harmless treatment of waste, can efficiently treat a large amount of household waste on a large scale, solves the difficulty of waste encirclement, fully utilizes the calorific value of urban household waste by means of the high power generation efficiency of the large-scale coal-fired unit, improves the utilization efficiency of waste, and reduces the cost of waste treatment.

[0024] Further, the present system utilizes the high-temperature environment of the cyclone furnace and the liquid slagging characteristics to realize complete degradation of dioxin generated by waste incineration and solidification of heavy metal pollutants in the ash, effectively solves the problem of secondary pollution of waste incineration, completes the comprehensive treatment and utilization of waste ash, and innovates the mode and efficiency of waste ash treatment and utilization, reduces the cost of dioxin and heavy metal treatment, and improves the economic benefit of the power plant.

[0025] Further, the present system and method significantly reduce the generation of NO x in the initial combustion process of the cyclone furnace by means of separation and injection of waste pyrolysis gas, blending of waste carbon, injection of circulating flue gas, and arrangement of the main combustion zone, NO x reduction zone and burnout zone, break the application bottleneck of the cyclone furnace, reduce the operation cost of the SCR denitration device, and greatly improve the economic efficiency of power plant investment and operation.

[0026] Further, the present system turns waste into treasure, fully utilizes the energy in the waste under the premise of ensuring cleanliness and comprehensive utilization of ash, increases the waste treatment benefit and reduces the fuel cost of the power plant, significantly improves the economic benefit of the power plant, and promotes the CO2 emission reduction of the power plant.

[0027] Further, the present system and method are simple and effective, and also simplify the treatment for the modification of the existing power plant, which only needs to add a waste pyrolysis gasifier and a waste storage device in the original system. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The present application is a waste pyrolysis gasification coupled cyclone furnace low-NO x x burning harmless treatment system flowchart.

[0029] In the diagram: 1 is the waste storage pit, 2 is the waste crusher, 3 is the screw feeder, 4 is the hopper, 5 is the pyrolysis gasification furnace, 6 is the waste burner, 7 is the coal ash / pulverized coal burner, 8 is the secondary air nozzle, 9 is the waste pyrolysis gasification gas nozzle, 10 is the cyclone furnace, 11 is the coal mill, 12 is the slag outlet, 13 is the granulation water tank, 14 is the boiler body, 15 is the air preheater, 16 is the blower, and 17 is the high-temperature circulating fan. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a low-NOx waste pyrolysis gasification coupled cyclone furnace. x A co-firing harmless treatment system and method enables large-scale harmless treatment of waste in a cyclone furnace, reducing waste treatment costs and improving waste utilization efficiency while solving the NOx problem in the cyclone furnace. x This invention addresses challenges such as emissions and waste ash disposal. It utilizes waste pyrolysis gasification technology, leveraging the heat from flue gas in a power plant boiler, to reduce NO production during combustion by injecting the reducing gas generated during pyrolysis gasification into a cyclone furnace. x Furthermore, by utilizing the high-temperature environment of the cyclone furnace and liquid slag discharge technology, the complete degradation of dioxins from waste combustion and the comprehensive treatment and utilization of ash residue are achieved. In addition, this invention leverages the principle of complementary fuel characteristics and the advantages of the cyclone furnace to achieve large-scale, efficient, and clean combustion of low-volatile, difficult-to-burn, or high-alkali metal fuels, thereby improving the economic benefits of power plants while advancing their carbon emission reduction process.

[0033] See Figure 1 A low-NOx waste pyrolysis gasification coupled cyclone furnace x The co-firing harmless treatment system includes a waste storage pit 1, a waste crusher 2, a screw feeder 3, a hopper 4, a pyrolysis gasification furnace 5, a waste burner 6, a coal ash / pulverized coal burner 7, a secondary air nozzle 8, a waste pyrolysis gasification gas nozzle 9, a cyclone furnace 10, a coal mill 11, a slag outlet 12, a granulation water tank 13, a boiler body 14, an air preheater 15, a blower 16, a high-temperature circulating fan 17, and high-temperature combustion zones and NOx zones arranged sequentially along the length of the cyclone cylinder within the cyclone furnace. x The reduction zone and the burnout zone.

[0034] The garbage pit 1 conveys the garbage to the crusher 2 by grab bucket, and the garbage is naturally dropped into the garbage hopper 4 after being crushed. The screw feeder 3 is installed at the bottom of the hopper 4 and the pyrolysis gasifier 5. The pyrolysis gasification gas is connected to the nozzle 9 through a pipeline, and is conveyed to the whirl furnace hearth. The garbage charcoal is connected to the garbage charcoal inlet of the whirl furnace 10 through a pipeline, and is conveyed to the whirl furnace 10 by the primary conveying. The circulating flue gas is extracted from the boiler body 14 at a suitable temperature window point, is conveyed to the interlayer of the pyrolysis gasifier 5 through a pipeline to provide heat, and is then connected to the circulating fan 17 through a pipeline and is sent back to the whirl furnace or the boiler body. The coal mill 11 is connected to the coal / powder primary air nozzle through a pipeline. The slag flow port 12 is installed with a granulation pool. The air preheater is installed in the boiler tail flue.

[0035] The whirl furnace in the application is installed at the bottom of the boiler body, which is the main combustion area of the fuel, and the temperature can reach 1650 DEG C. The air preheater is installed in the tail flue of the boiler body, and the granulation pool is located at the bottom of the boiler hearth for cooling and granulation of the slag. The circulating flue gas extraction point is arranged in the boiler flue, and the high-temperature flue gas with a suitable temperature is extracted by the high-temperature circulating fan during work and is sent into the garbage pyrolysis gasifier to provide energy for garbage pyrolysis gasification. During work, the garbage stored in the garbage pit for a period of time is sent into the crusher for simple crushing, and then is sent into the hopper and is conveyed to the pyrolysis gasifier through the screw feeder for pyrolysis gasification reaction. The garbage charcoal and the pyrolysis gasification gas are obtained at the outlet. The garbage charcoal is conveyed to the whirl furnace for combustion treatment under the action of the hot primary air through the garbage burner. The pyrolysis gasification gas is sprayed into the NOx x The reduction zone reduces the generated NOx x and burns and utilizes it; the coal block is conveyed to the coal pulverizing system, and the coal mill grinds the coal into coal or coal powder with a suitable fineness, which is sprayed into the whirl furnace through the coal / powder burner for combustion and utilization; the fuel in the whirl furnace is intensely combusted in the whirl field, and a stable slag film is formed on the wall surface of the whirl furnace. The molten slag continuously flows into the granulation pool through the slag flow port for cooling, and then the ash and slag are comprehensively utilized; the heat required for pyrolysis gasification is supplied by the hearth flue gas, which is extracted from the inside of the hearth at a suitable position through the high-temperature circulating fan. The circulating flue gas flows through the pyrolysis furnace and then returns to the hearth or is partially injected into the whirl furnace to adjust the temperature in the whirl furnace; the hot air required by the system is extracted by the air feeder, is sent into the air preheater, and then is supplied for use. Part of the hot air is conveyed to the pyrolysis furnace to supply a small amount of oxygen for garbage pyrolysis gasification.

[0036] The valve is arranged on the pipeline connected to the coal mill 11 at one air outlet of the air preheater 15, and the valve is arranged on the pipeline connected to the pyrolysis gasifier 5 at the other air outlet.

[0037] The further improvement of the present application is that the cyclone furnace is arranged in the length direction of the cyclone furnace and can be further divided into high-temperature combustion zone, NO x Reduction zone and burnout zone.

[0038] In the present application, the hot air amount and temperature sent into the garbage pyrolysis gasification furnace are adjusted by air mixing, the pyrolysis gas is sent into the cyclone furnace for NO x Reduction and pollutant degradation, and the residual garbage is sent into the cyclone furnace for combustion treatment under high-temperature conditions.

[0039] In the present application, the cyclone furnace can be arranged according to the actual capacity of the power plant and the fuel characteristics, and is distributed on both sides of the boiler body; the cyclone furnace can be selected as a horizontal or vertical cyclone furnace according to factors such as site restrictions;

[0040] In the present application, the water cooling system with pins and the slag supplementing pipe bundle are arranged in the cyclone furnace, so as to stabilize the slag film and capture the ash and slag at the outlet of the cyclone furnace.

[0041] In the present application, the coal and garbage are stored and pulverized respectively, and the coal and garbage fuels are ground or crushed, so as to meet the different particle size requirements of the two fuels; the coal mill of the coal can be selected as a medium-speed fan mill or a steel ball mill according to the particle size requirements of the coal powder.

[0042] In the present application, the proportion of the burnout air can be selectively increased, and the NO x Emission can be increased on the basis of being acceptable, the burnout rate of the fuel is further improved, the carbon content of the fly ash is reduced, and the boiler efficiency is improved.

[0043] The system and method are suitable for garbage and coal mixed combustion system, and have strong adaptability to the types and qualities of garbage and coal, and are especially suitable for combustion and utilization of biomass garbage, high-alkali coal, low-volatile fuel including semi-coke, anthracite and lean coal.

[0044] The semi-coke low-NO x Mixing combustion method, main process and parameter summary are as follows:

[0045] 1. The position of the circulating fan for extracting flue gas can be adjusted according to the internal temperature field of the furnace, and the temperature can be selected as 700-900 DEG C.

[0046] 2. The excess air coefficient in the high-temperature combustion zone of the cyclone furnace is controlled to be lower than 0.8, so as to ensure that a high-temperature reducing atmosphere is created, and the generation of NO x Is reduced from the source.

[0047] 3. The garbage pyrolysis gas flow can be adjusted by the amount of hot air introduced into the pyrolysis furnace as needed, and the gas composition in the hot gas is controlled, so as to maximize the reduction of NO x Generation and reduce the amount of unburned fuel.

[0048] 4. The garbage storage time can be adjusted according to the nature, water content, heat value and the like of different municipal solid waste, and can be controlled within 1-4 days;

[0049] 5. The garbage can be simply crushed to meet the size requirements of the hopper and screw feeder and the garbage burner, so as to save power; the cyclone furnace requires that the particle size of coal is less than 5 mm to ensure stable combustion, and the economic fineness can be calculated according to the actual situation to maximize the combustion efficiency and economic benefits;

[0050] 6. The extraction position of the circulating flue gas is generally located in the boiler furnace, and can also be selected according to the temperature interval; the amount of circulating flue gas entering the cyclone furnace can be controlled by a valve or a flow meter according to the temperature adjustment needs of the cyclone furnace;

[0051] The application provides a semi-coke low-NO x The method of mixed burning is specifically implemented as follows:

[0052] A garbage pyrolysis gasification coupled cyclone furnace low-NO x The harmless treatment method of mixed burning comprises the following steps:

[0053] 1. The collected garbage is first stored in a garbage storage pit 1 for a period of time to reduce the water content, and then is sent to a crusher 2 for simple crushing, and is sent to a pyrolysis gasification furnace 5 for pyrolysis and gasification, so as to realize water drying and early removal of part of pollutants under low-oxygen conditions; the pyrolysis gas obtained by pyrolysis contains a large amount of hydrocarbons and H free radicals and is sent to a NO x reduction zone in the cyclone furnace to reduce a large amount of NO x generated in the cyclone combustion, and is combusted and utilized in the furnace.

[0054] 2. The heat required by the garbage pyrolysis gasification furnace 5 is mainly provided by the high-temperature circulating flue gas extracted from the inside of the furnace, and part of the heat is generated by the reaction of oxygen in the hot air and the garbage, so as to improve the energy utilization efficiency; in addition, the circulating flue gas at the outlet of the pyrolysis gasification furnace 5 is mainly returned to the furnace, and part of the circulating flue gas can be introduced into the cyclone furnace to adjust and control the temperature of the cyclone furnace.

[0055] 3. The coal is ground by an independent coal mill 11, and after being ground, is sent into the cyclone furnace 10 by hot primary air through a coal powder burner 7 to be combusted and utilized, so as to ensure the high-temperature environment in the cyclone furnace; the cyclone furnace has strong adaptability to fuel and high combustion heat capacity, and the particle size of the coal is less than 5 mm to ensure stable combustion, and the particle size of the coal can be controlled according to the actual temperature condition of the cyclone furnace to save the power of the coal pulverizing system.

[0056] 4. The cyclone furnace 10 is provided with a high-temperature combustion zone, a NO x reduction zone and a burnout zone, wherein the garbage and the coal are combusted in the high-temperature cyclone field formed by the primary air and the secondary air in the high-temperature combustion zone;x The reduction zone is sprayed with pyrolysis gasification gas to reduce the generated NO x The circulating flue gas of the pyrolysis furnace is partially introduced into the cyclone furnace to control the temperature; the burnout zone is partially mixed with NO x The reduction zone overlaps and extends to the inside of the furnace body, realizing the burnout of coal and garbage.

[0057] 5. Coal and garbage are sprayed into the furnace through different burners, garbage has strong ignition and burnout performance, and the two complement each other through fuel characteristics, realizing the improvement of coal combustion efficiency, and further improving the combustion characteristics of the fuel through the ignition effect of flammable garbage. This method is particularly suitable for low-volatile and difficult-to-burn coal. In addition, the arrangement position of the two burners can be adjusted or exchanged according to actual conditions.

[0058] 6. The characteristic pollutants such as dioxin generated by garbage combustion are completely degraded under high temperature conditions up to 1650℃; the inner wall of the cyclone furnace 10 is attached with a molten slag film, which is discharged through the slag flow port 12 into the granulation pool in a liquid state, and the heavy metal pollutants in the obtained ash can be solidified, and the obtained ash can be comprehensively utilized, realizing the harmless treatment of garbage.

[0059] 7. Air heated by a preheater is used as primary air for conveying coal and garbage, and secondary air and combustion air for the cyclone furnace, and can partially supply oxygen to the pyrolysis furnace, realizing oxygen-controlled gasification of garbage.

[0060] 8. According to the actual operation condition, hot air mixed with pure oxygen or pure oxygen can be selected as burnout air, the reduction length of NO x is extended, and the unburned fuel is intensely burned under high oxygen concentration conditions, significantly improving the fuel combustion efficiency.

[0061] It should be understood that the above embodiments are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should also be understood that those skilled in the art can make various modifications or modifications to the present application after reading the content taught by the present application, however, these equivalent forms also fall within the scope defined by the claims attached to the present application.

[0062] The above is only a preferred embodiment of the present application and does not limit the present application in any form; any ordinary technical personnel in this industry can easily implement the present application according to the drawings shown in the specification and the above description; however, any equivalent changes, modifications and evolution made by those skilled in the art without departing from the scope of the technical solutions of the present application, using the technical content disclosed above, are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above embodiments according to the essence of the present application are still within the protection scope of the technical solutions of the present application.

Claims

1. A garbage pyrolysis gasification coupled cyclone furnace blending combustion treatment system, characterized in that, It comprises a pyrolysis gasifier (5), a garbage burner (6), a cyclone furnace (10), a coal mill (11), a granulation pool (13), a boiler body (14) and an air preheater (15); The garbage carbon outlet of the pyrolysis gasifier (5) is connected with the garbage burner (6) through a pipeline; the pyrolysis gas outlet of the pyrolysis gasifier (5) is connected with the cyclone furnace (10) through a pipeline, and the cyclone furnace (10) is installed at the bottom of the boiler body (14); the air preheater (15) is installed in the tail flue of the boiler body (14); an air blower (16) is arranged at the inlet of the air preheater (15); the outlet of the coal mill (11) is connected with the coal / ash burner (7) through a pipeline, and the inlet of the coal mill (11) is connected with the outlet of the air preheater (15) through a pipeline; the garbage burner (6) is arranged at the garbage carbon primary air injection port of the cyclone furnace (10), the coal / ash burner (7) is arranged at the coal / ash primary air inlet of the cyclone furnace (10), and the granulation pool (13) is arranged at the bottom of the furnace chamber of the boiler body (14). The high-temperature combustion zone, NO x The reduction zone and the burnout zone, the garbage burner (6) is communicated with the high-temperature combustion zone of the cyclone furnace (10), the garbage pyrolysis gasification gas outlet of the pyrolysis gasification furnace (5) is connected with the nozzle (9) on the cyclone furnace (10) through a pipeline, and the nozzle (9) is arranged on the NO x Reduction zone A high-temperature circulating air blower (17) is arranged between the furnace chamber flue of the boiler body (14) and the pyrolysis gasifier (5); a circulating flue gas extraction point is arranged in the furnace chamber flue of the boiler body (14), the high-temperature circulating air blower (17) extracts flue gas at the circulating flue gas extraction point, and the temperature in the furnace chamber flue is 700-800 ℃.

2. The garbage pyrolysis and gasification coupled cyclone furnace blending combustion treatment system according to claim 1, characterized in that, A slag tapping hole (12) is arranged at the bottom of the furnace chamber of the boiler body (14), the slag tapping hole (12) is communicated with the burnout zone of the cyclone furnace (10), and the granulation pool (13) is arranged at the bottom of the slag tapping hole (12).

3. The garbage pyrolysis gasification coupled cyclone furnace blending combustion treatment system according to claim 1, wherein a secondary air injection port (8) is further arranged at the high-temperature combustion zone in the cyclone furnace (10), and the secondary air injection port (8) is connected with the secondary air outlet of the air preheater (15) through a pipeline.

4. The garbage pyrolysis and gasification coupled cyclone furnace blending combustion treatment system according to claim 1, characterized in that, One way of the primary air outlet of the air preheater (15) is connected with the coal mill (11), and the other way is connected with the pyrolysis gasifier (5).

5. The garbage pyrolysis and gasification coupled cyclone furnace blending combustion treatment system according to claim 1, characterized in that, A hopper (4) is arranged at the inlet of the pyrolysis gasifier (5); the garbage in the hopper (4) is sent into the pyrolysis gasifier (5) through a screw feeder (3), and the screw feeder (3) is installed at the bottom of the hopper (4) and the pyrolysis gasifier (5).

6. The garbage pyrolysis and gasification coupled cyclone furnace blending combustion treatment system according to claim 1, characterized in that, Further comprising a garbage storage pit (1) and a garbage crusher (2), the garbage in the garbage storage pit (1) is sent into the garbage crusher (2) for crushing, and then is sent into the pyrolysis gasifier (5) through the hopper (4).

7. The system according to claim 1, wherein the system is characterized in that, The cyclone furnace (10) can be arranged in multiple numbers according to the actual capacity of the power plant and the fuel characteristics, and is distributed on both sides of the boiler body (14).

8. A method for waste pyrolysis gasification coupled with cyclone furnace blending combustion treatment, based on the waste pyrolysis gasification coupled with cyclone furnace blending combustion treatment system of any one of claims 1-7, characterized in that, S2, the coal is ground by the coal mill (11), and the hot primary air generated by the air preheater (15) is sent into the cyclone furnace (10) through the coal burner (7) for combustion, S1, the garbage is sent into the pyrolysis gasifier (5) to carry out pyrolysis gasification, and the pyrolysis gas obtained by pyrolysis is sent into the cyclone furnace (10) to reduce the NO generated in the cyclone combustion x and is combusted in the furnace of the boiler body (14) for utilization, and the garbage carbon obtained by pyrolysis is combusted in the cyclone furnace (10) by the primary air generated by the air preheater (15) through the garbage burner (6); ​ S3, coal and garbage carbon are high-temperature melted in the cyclone furnace (10), the characteristic pollutants produced by garbage combustion at high temperature are completely degraded, the slag film in the molten state adhered to the inner wall of the cyclone furnace (10) flows into the granulation pool (13), and the heavy metal pollutants in the solidified ash slag are treated, so that the garbage is harmlessly treated.

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