CN111121052A

CN111121052A - Boiler combustion solid waste treatment device based on plasma technology and process thereof

Info

Publication number: CN111121052A
Application number: CN202010021117.3A
Authority: CN
Inventors: 张孝勇; 刘彦鹏; 丁浩植
Original assignee: Thermal Power Generation Technology Research Institute of China Datang Corporation Science and Technology Research Institute Co Ltd
Current assignee: Thermal Power Generation Technology Research Institute of China Datang Corporation Science and Technology Research Institute Co Ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-05-08

Abstract

The invention discloses a plasma technology-based boiler combustion solid waste treatment device in the field of waste treatment, including a garbage pretreatment device, a plasma treatment device, a boiler, an ash treatment device and a tail gas treatment device. The plasma treatment device The pre-treated solid waste is input into the plasma treatment device, and the plasma treatment device transports the generated syngas and ash to the boiler and the ash treatment device, respectively, and the boiler is also connected to the exhaust gas treatment device. It will generate secondary pollution sources, and the treated materials can be recycled to generate new economic benefits. While protecting the environment, it is also convenient for the recycling of resources. It has huge social and economic value and commercial use prospects.

Description

Boiler combustion solid waste treatment device based on plasma technology and process thereof

Technical Field

The invention relates to the technical field of waste treatment, in particular to a boiler combustion solid waste treatment device and a boiler combustion solid waste treatment process based on a plasma technology.

Background

The object to be treated in the waste treatment industry is generally solid waste, and the treatment means is not limited to physical methods and chemical methods, wherein the physical methods adopt methods such as crushing, compression, drying, evaporation, incineration and the like, and the chemical methods adopt methods such as oxidation, digestive decomposition, absorption and the like, so that the volume of the solid waste is reduced, and natural purification is accelerated. And the waste such as waste liquid and waste gas needs to be pretreated, and solid particles in the waste need to be separated out for physical or chemical treatment.

After the conventional waste is treated, because of insufficient temperature or special properties of the waste, the conditions of incomplete incineration, insufficient dissolution and the like are caused, and partial residue which cannot be treated is generally left. The residue produced by incomplete treatment often has certain pollution components, secondary pollution is caused to the environment, and even the environment is permanently damaged because the residue cannot be naturally degraded further. The residues need special treatment before being poured and buried, otherwise, the environmental pollution is inevitably caused. The process of retreatment or purification needs to invest additional equipment and resources, thus indirectly increasing the treatment cost; harmful substances contained in the residue not only pollute the environment, but also easily affect the health of human bodies through various ways.

Plasma is a fourth state of matter existence, with all its electro-and electro-magnetic properties, and behaves in many ways differently from the commonly found solids, liquids and gases. Plasma can be classified into high-temperature plasma and low-temperature plasma according to temperature and electron density. Low temperature plasmas are further classified into thermal plasmas and cold plasmas. Low temperature plasmas can accomplish many things that are difficult to do with common gases. For example, many endothermic chemical reactions may be carried out using high temperature, high density thermal plasma, and various materials may also be heated or melted. Thermal plasma has been widely used in numerous industrial sectors and laboratories for machining (welding, cutting, spraying, etc.), metallurgy (melting and remelting of metals, heat preservation, new smelting processes, etc.), chemical industry (titanium dioxide production, acetylene production, nitrogen fixation from air, etc.), aerospace (rail gun, ablation experiments of thermal protective materials, material evaluation experiments, high temperature gas dynamics experiments, etc.), materials (preparation of ultrafine and ultrapure material powders, preparation of synthetic materials, etc.), electric light sources, etc.

With the implementation of the strictest garbage classification standard in Shanghai in 7 months in 2019, the nation requires that 46 major cities to be tested in advance are basically built into a garbage classification treatment system by the end of 2020. The garbage classification is significant for garbage treatment, and dry garbage enters a household garbage incineration power plant for incineration power generation disposal in the treatment process of the classified garbage; wet garbage enters a kitchen garbage treatment plant, after anaerobic fermentation, biogas is used for power generation, and residues are used for incineration; the harmful garbage enters a hazardous waste treatment plant for treatment or enters a hazardous waste landfill for treatment; the garbage can be recycled for resource recycling disposal. When the classified dry garbage is incinerated, the heat productivity is obviously increased, and the combustion treatment of the classified dry garbage in an incinerator is more facilitated.

The garbage gasification treatment technology is an efficient and environment-friendly garbage treatment mode, is a potential treatment mode, and is particularly widely applied to the field of dangerous waste treatment. However, the current garbage gasification treatment technology usually utilizes natural gas, petroleum or pure oxygen to increase the garbage gasification rate so as to achieve the purpose of complete gasification of the garbage.

Based on the technical scheme, the invention designs the boiler combustion solid waste treatment device and the process thereof based on the plasma technology, and develops a new way for harmless, quantitative reduction and resource treatment of the fixed waste of the boiler by utilizing the plasma technology.

Disclosure of Invention

The invention aims to provide a boiler combustion solid waste treatment device based on a plasma technology and a process thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a boiler combustion solid waste treatment device based on a plasma technology comprises a garbage pretreatment device, a plasma treatment device, a boiler, an ash treatment device and a tail gas treatment device, wherein the plasma treatment device inputs pretreated solid waste into the plasma treatment device, the plasma treatment device respectively conveys generated synthesis gas and ash into the boiler and the ash treatment device, and the boiler is further connected with the tail gas treatment device.

Preferably, the garbage pretreatment device comprises a turnover box, a lifter, a powerful crusher and a screw conveyer, solid waste is loaded into the turnover box and is conveyed into the powerful crusher through the lifter, and an inlet of the screw conveyer is connected with an outlet of the powerful crusher.

Preferably, plasma processing apparatus is including the dry zone and the burning zone that are connected, the one end that burning zone was kept away from to the dry zone is equipped with synthesis gas export and feed inlet, the synthesis gas export with tail gas processing apparatus's entrance point is connected, the equipartition has a plurality of plasma guns on the inner wall in dry zone and burning zone, the one end that dry zone was kept away from to the burning zone is equipped with air inlet and ashes fill, the bottom of ashes fill is equipped with the ashes export, still install the control valve on the ashes fill.

Preferably, the ash processing device comprises a cooling tower, the cooling tower is sequentially connected with a first waste heat recovery device and an ash outlet through an ash pipe, a spray pipe is arranged at the top of an inner cavity of the cooling tower, a water-slag separation plate is arranged below the spray pipe in the inner cavity of the cooling tower, and the bottom end of the water-slag separation plate is communicated with a slag outlet at the bottom of the outer wall of the cooling tower.

Preferably, the bottom of the inner cavity of the cooling tower is positioned below the water-slag separation plate and is provided with a heat exchanger, the outside of the cooling tower is connected to the outlet end of a water pump through a circulating pipe, and the inlet end of the water pump is connected to the bottom of the inner cavity of the cooling tower through a circulating pipe.

Preferably, the tail gas processing apparatus includes the gas pipeline, through the after-combustion chamber connects gradually waste heat recovery device two, deacidification quench tower, filter equipment, dust collector one, dust collector two, denitrification facility, chimney and draught fan, also install the plasma rifle in the gas pipeline.

Preferably, the inside of the filter device is provided with activated carbon and slaked lime, the first dust removal device is a baffle plate gravity dust removal device, the second dust removal device is a cloth bag dust removal device, the first dust removal device comprises baffle plates which are arranged on the inner wall of the first dust removal device in a staggered mode, and the bottom of the first dust removal device is provided with an ash outlet.

Preferably, the boiler comprises a hearth and a pulverized coal burner, the synthesis gas outlet is connected with a gas-solid separator through a gas pipeline, and the gas-solid separator is respectively connected with the hearth and the pulverized coal burner through two conveying pipelines.

A boiler combustion solid waste treatment process based on a plasma technology specifically comprises the following steps:

s1: the solid waste materials of the boilers to be treated are put into a turnover box and are sent into a powerful crusher through a lifter, and after being crushed in the powerful crusher, the solid waste materials are sent into a plasma treatment device by a screw conveyor for waste treatment;

s2: sending the pretreated crushed solid waste into a plasma treatment device from a feed inlet, flowing to an incineration zone along a drying zone, drying and incinerating under the action of a plasma gun, introducing air through an air inlet, so that high-temperature synthesis gas generated by the solid waste enters a tail gas treatment device from a synthesis gas outlet under the action of air, and collecting generated ash through an ash bucket;

s3: the high-temperature synthesis gas entering the tail gas treatment device flows along a gas pipeline, secondary combustion is carried out through a plasma gun in the secondary combustion chamber, then waste heat recovery is carried out through a waste heat recovery device II, then the waste gas subjected to waste heat recovery is subjected to deacidification, dedusting and denitration treatment through an acid removal quenching tower, a filtering device, a dedusting device I, a dedusting device II and a denitration device in sequence, and finally generated middle-low temperature tail gas is discharged from a chimney under the action of a draught fan;

s4: the dust discharged from the ash outlet is introduced into the cooling tower through the ash pipe and the first waste heat recovery device, the ash is cooled into solid metal and molten glass through the spray pipe, and then the solid metal and the molten glass are recovered through the slag outlet;

s5: and liquid passing through the water-slag separation plate exchanges heat through the heat exchanger, and cooling water after heat exchange is conveyed to the spray pipe through the water pump and the circulating pipe to be recycled, wherein waste heat recovered by the waste heat recovery device II, the waste heat recovery device I and the heat exchanger is conveyed into the boiler through pipelines.

Compared with the prior art, the invention has the beneficial effects that: the invention overcomes the defects of single type and incomplete treatment of wastes in the traditional technology, does not generate secondary pollution sources, can generate new economic benefits after the treated matters are recycled, protects the environment, is convenient for recycling resources, and has huge social and economic values and commercial application prospects.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the garbage pretreatment apparatus according to the present invention;

FIG. 3 is a schematic view of the plasma treatment device and the tail gas treatment device according to the present invention;

FIG. 4 is a schematic view of a slag treatment apparatus according to the present invention;

FIG. 5 is a schematic view of the structure of the boiler of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a garbage pretreatment device; 101. a turnover box; 102. a hoist; 103. a powerful crusher; 104. a screw conveyor; 2. a plasma processing apparatus; 201. a syngas outlet; 202. a feed inlet; 203. a drying zone; 204. an incineration zone; 205. a plasma gun; 206. an air inlet; 207. a control valve; 208. an ash hopper; 209. an ash outlet; 3. a boiler; 301. a hearth; 302. a pulverized coal burner; 303. a gas-solid separator; 304. a delivery line; 4. an ash treatment device; 401. an ash pipe; 402. a first waste heat recovery device; 403. a cooling tower; 404. a shower pipe; 405. a circulation pipe; 406. a water pump; 407. a water-slag separating plate; 408. a slag outlet; 409. a heat exchanger; 5. a tail gas treatment device; 501. a secondary combustion chamber; 502. a second waste heat recovery device; 503. a deacidification quench tower; 504. a filtration device; 505. a first dust removal device; 5051. a baffle plate; 5052. an ash outlet; 506. a second dust removal device; 507. a denitration device; 508. a chimney; 509. an induced draft fan; 510. a gas pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1-5, the present invention provides a technical solution: a boiler combustion solid waste treatment device based on a plasma technology comprises a waste pretreatment device 1, a plasma treatment device 2, a boiler 3, an ash treatment device 4 and a tail gas treatment device 5, wherein the plasma treatment device 2 inputs pretreated solid waste into the plasma treatment device 2, the plasma treatment device 2 respectively conveys generated synthesis gas and ash into the boiler 3 and the ash treatment device 4, and the boiler 3 is further connected with the tail gas treatment device 5.

In this embodiment, the garbage pretreatment apparatus 1 includes a container 101, a lifter 102, a powerful crusher 103, and a screw conveyor 104, solid waste is loaded into the container 101 and is fed into the powerful crusher 103 by the lifter 102, and an inlet of the screw conveyor 104 is connected to an outlet of the powerful crusher 103.

In this embodiment, the plasma processing apparatus 2 includes a drying region 203 and an incineration region 204 connected to each other, one end of the drying region 203, which is far away from the incineration region 204, is provided with a syngas outlet 201 and a feed inlet 202, the syngas outlet 201 is connected to an inlet end of the tail gas processing apparatus 5, a plurality of plasma guns 205 are uniformly distributed on inner walls of the drying region 203 and the incineration region 204, one end of the incineration region 204, which is far away from the drying region 203, is provided with an air inlet 206 and an ash bucket 208, a bottom end of the ash bucket 208 is provided with an ash outlet 209, and the ash bucket 208 is further provided with a control valve 207.

In this embodiment, the ash processing device 4 includes a cooling tower 403, the cooling tower 403 is sequentially connected with a first waste heat recovery device 402 and an ash outlet 209 through an ash pipe 401, a spray pipe 404 is disposed at the top of an inner cavity of the cooling tower 403, a water-slag separating plate 407 is disposed below the spray pipe 404 in the inner cavity of the cooling tower 403, and the bottom end of the water-slag separating plate 407 is communicated with a slag outlet 408 at the bottom of the outer wall of the cooling tower 403.

In this embodiment, a heat exchanger 409 is installed at the bottom of the inner cavity of the cooling tower 403 below the water-slag separating plate 407, the exterior of the cooling tower 403 is connected to the outlet end of a water pump 406 through a circulating pipe 405, and the inlet end of the water pump 406 is connected to the bottom of the inner cavity of the cooling tower 403 through the circulating pipe 405.

In this embodiment, the tail gas treatment device 5 includes a gas pipeline 510, the secondary combustion chamber 501 is sequentially connected with a second waste heat recovery device 502, a deacidification quenching tower 503, a filtering device 504, a first dust removal device 505, a second dust removal device 506, a denitration device 507, a chimney 508 and an induced draft fan 509, and a plasma gun 205 is also installed in the gas pipeline 510.

In this embodiment, the inside of the filter device 504 is activated carbon and slaked lime, the first dust collector 505 is a baffle plate gravity dust collector, the second dust collector 506 is a cloth bag dust collector, the first dust collector 505 includes baffle plates 5051 arranged on the inner wall of the first dust collector 505 in a staggered manner, and the bottom of the first dust collector 505 is provided with an ash outlet 5052.

In this embodiment, as shown in fig. 5, the boiler 3 includes a furnace 301 and a pulverized coal burner 302, the syngas outlet 201 is connected to a gas-solid separator 303 through a gas pipe 510, and the gas-solid separator 303 is connected to the furnace 301 and the pulverized coal burner 302 through two conveying pipes 304. Gases such as H2, CH4, CO and the like produced by the plasma-assisted coal gasification technology are injected into a boiler furnace as reburning fuel to reduce the generated NOx. Meanwhile, the air staged combustion treatment is carried out on the main combustion area through the gas reburning technology, so that the advantages of the 2 low NOx combustion technologies of gas reburning and double-scale air staging are complemented, the effect of ultralow NOx emission is achieved, and the problem that a large amount of natural gas is needed by reburning and nitrogen reduction of the boiler is solved.

Experiments show that the maximum coal processing amount can reach 5t/h under the condition that the power of the plasma generator is 60kW, the low-energy-consumption plasma-assisted coal gasification is realized, and the method has a good industrial application prospect. According to estimation, taking a 300MW power station coal-fired boiler as an example, after a plasma coal gasification technology is adopted, the emission of nitrogen oxides at the outlet of the boiler can be reduced by more than 50 percent on the original basis, the initial investment is slightly lower than that of an SCR denitration technology, the operation cost is only half of that of the SCR, and the coal-fired boiler has good economic and environmental benefits.

Example 2

S1: the solid waste of each boiler to be treated is loaded into a turnover box 101, sent into a powerful crusher 103 through a lifter 102, crushed in the powerful crusher 103, and then sent into a plasma treatment device 2 by a screw conveyor 104 for waste treatment;

s2: sending the pretreated crushed solid waste into the plasma treatment device 2 from the feeding hole 202, flowing to the incineration zone 204 along the drying zone 203, drying and incinerating under the action of the plasma gun 205, and introducing air through the air inlet 206, so that high-temperature synthesis gas generated by the solid waste enters the tail gas treatment device 5 from the synthesis gas outlet 201 under the action of the air, and the generated ash is collected through the ash hopper 208;

s3: the high-temperature synthesis gas entering the tail gas treatment device 5 flows along a gas pipeline 510, firstly, secondary combustion is carried out through a plasma gun 205 in a secondary combustion chamber 501, then, waste heat recovery is carried out through a waste heat recovery device II 502, then, the waste gas after the waste heat recovery is sequentially subjected to acid removal, dust removal and denitration treatment through an acid removal quenching tower 503, a filtering device 504, a dust removal device I505, a dust removal device II 506 and a denitration device 507, and finally, the generated middle-low temperature tail gas is discharged from a chimney 508 under the action of an induced draft fan 509;

s4: the dust discharged from the ash outlet 209 is introduced into the cooling tower 403 through the ash pipe 401 and the first waste heat recovery device 402, the ash is cooled into solid metal and molten glass through the spray pipe 404, and then the solid metal and the molten glass are recovered through the slag outlet 408;

s5: the liquid passing through the water-slag separation plate 407 exchanges heat through a heat exchanger 409, and the cooling water after heat exchange is conveyed to a spray pipe 404 through a water pump 406 and a circulating pipe 405 to recycle a water source, wherein the waste heat recovered by the waste heat recovery device II 502, the waste heat recovery device I402 and the heat exchanger 409 is conveyed into the boiler 3 through a pipeline.

Wherein, the adoption of a quenching measure to the gas product, or different plasma atmospheres and the like have special effects on the reaction, the table 1 is the comparison of the components of the gas product obtained by pyrolyzing the tire powder under different atmosphere plasma conditions, and the table 2 compares the influence of the quenching and non-quenching measures on the components of the gas product in the process of pyrolyzing the polypropylene by using the plasma.

TABLE 1 comparison of the composition of the gas product of plasma pyrolysis of polypropylene in a water vapor and nitrogen atmosphere

TABLE 2 comparison of plasma pyrolysis plastic products under quench measures

The plasma pyrolysis of the organic solid waste basically has no pollutant emission, and the excess air coefficient of a pyrolysis system is small, so that the exhaust volume is small, and the secondary pollution to the atmospheric environment is favorably reduced; most of harmful components such as sulfur, heavy metals and the like in the solid waste are fixed in the carbon black, so that the content of pollutants such as heavy metals, dioxin and the like in the gas is low. The content of pollutant gases such as SO2, NOx and the like in the gas product is low through detection, and the calorific value is 4-7 MJ/kg. Therefore, the gas product can be directly used as low-sulfur gas fuel. Such as boiler fuel, can be used alone after separating each gas component.

Since the organic solid waste is mainly hydrocarbon, the gas product with high hydrogen content can be obtained by pyrolyzing the organic solid waste by plasma, and the gas product is a raw material for manufacturing a fuel cell, and the combination of the two technologies is the best combination for recovering polymers. Meanwhile, H2 can also be applied to chemical industry, metallurgical industry, semiconductor industry and the like.

When water vapor is added in the pyrolysis process, synthesis gas can be generated, and the application range of the product is further expanded. Table 1 compares the change in composition of the gaseous products obtained under the conditions in which water vapor participates in the reaction. Chemicals such as methanol can also be produced according to the component ratio.

If a water cooling facility is added in the reaction process, C2H2 can be obtained, and C2H2 is also an important industrial raw material and is hardly generated under the ordinary pyrolysis condition. At present, C2H2 is mainly prepared by a calcium carbide method, which not only pollutes the environment, but also wastes resources.

Table 2 compares different experimental results of pyrolyzing polyethylene and polypropylene with plasma, pyrolyzing polypropylene with high-frequency inductive coupling plasma, and using a quenching measure, the gas product is 94% of propylene monomer, a small amount of methane, etc. (the influence of working gas nitrogen is removed), and the gas product can be used as directly recovered propylene monomer. However, when polyethylene is processed by this technique, the gaseous product is a mixture of propylene monomer and ethylene monomer, and the propylene monomer content is higher than desired.

Under the action of the plasma treatment device 2, the metal and the ash form a molten liquid at the bottom of the reactor and flow out, and the organic part is gasified into gas and escapes from the top of the reactor.

The large-scale device for treating wastes by utilizing the thermal plasma technology is mainly applied to treating high-risk wastes and burning ash residues of the wastes at present, and one important reason is that toxic substances in the high-risk wastes can be thoroughly decomposed by the ultrahigh temperature of the thermal plasma. Another reason is that the disposal of high-risk wastes such as medical wastes, nuclear wastes, etc. is not greatly affected by the high cost of disposal because they have high risks that governments must dispose of. For the treatment of organic solid wastes, plasma pyrolysis is a treatment method and an efficient recycling method. While the waste is treated, petroleum products such as gas fuel, carbon black and the like are recovered, the product separation is easy, no secondary pollution is caused, and the heat energy is fully utilized. Has the advantages of volume reduction, high reduction degree, capability of obtaining energy sources and the like, and has great significance in the aspects of protecting environment and resources, promoting sustainable development and the like.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a boiler burning solid waste processing apparatus based on plasma technique which characterized in that: the device comprises a garbage pretreatment device (1), a plasma treatment device (2), a boiler (3), an ash treatment device (4) and a tail gas treatment device (5), wherein the plasma treatment device (2) inputs pretreated solid waste into the plasma treatment device (2), the plasma treatment device (2) respectively conveys generated synthesis gas and ash into the boiler (3) and the ash treatment device (4), and the boiler (3) is further connected with the tail gas treatment device (5).

2. A boiler combustion solid waste treatment device based on plasma technology, according to claim 1, characterized in that: the garbage pretreatment device (1) comprises a turnover box (101), a lifting machine (102), a powerful crusher (103) and a screw conveyor (104), solid waste is loaded into the turnover box (101) and is conveyed into the powerful crusher (103) through the lifting machine (102), and an inlet of the screw conveyor (104) is connected with an outlet of the powerful crusher (103).

3. A boiler combustion solid waste treatment device based on plasma technology, according to claim 2, characterized in that: plasma processing apparatus (2) is including dry zone (203) and the burning zone (204) that are connected, the one end that burning zone (204) was kept away from in dry zone (203) is equipped with syngas outlet (201) and feed inlet (202), syngas outlet (201) with the entrance point of tail gas processing apparatus (5) is connected, the equipartition has a plurality of plasma guns (205) on the inner wall of dry zone (203) and burning zone (204), the one end that drying zone (203) was kept away from in burning zone (204) is equipped with air inlet (206) and ember fill (208), the bottom of ember fill (208) is equipped with ember export (209), still install control valve (207) on ember fill (208).

4. A boiler combustion solid waste treatment device based on plasma technology according to claim 3, characterized in that: ashes processing apparatus (4) include cooling tower (403), waste heat recovery device (402) and ashes export (209) are connected gradually through ashes pipe (401) in cooling tower (403), cooling tower (403) inner chamber top is equipped with shower (404), the below that the inner chamber of cooling tower (403) is located shower (404) is equipped with water sediment separate plate (407), the bottom of water sediment separate plate (407) is linked together with slag notch (408) of cooling tower (403) outer wall bottom.

5. A boiler combustion solid waste treatment device based on plasma technology according to claim 4, characterized in that: the bottom of the inner cavity of the cooling tower (403) is positioned below the water-slag separation plate (407) and is provided with a heat exchanger (409), the outside of the cooling tower (403) is connected to the outlet end of a water pump (406) through a circulating pipe (405), and the inlet end of the water pump (406) is connected to the bottom of the inner cavity of the cooling tower (403) through the circulating pipe (405).

6. A boiler combustion solid waste treatment device based on plasma technology according to claim 5, characterized in that: tail gas processing apparatus (5) include gas line (510), through (3) connect gradually secondary combustion chamber (501), waste heat recovery device two (502), deacidification quench tower (503), filter equipment (504), dust collector one (505), two (506), denitrification facility (507), chimney (508) and draught fan (509), also install plasma gun (205) in gas line (510).

7. A boiler combustion solid waste treatment device based on plasma technology, according to claim 1, characterized in that: the dust collection device comprises a filtering device (504), wherein activated carbon and slaked lime are arranged in the filtering device, a first dust collection device (505) is a baffle plate gravity dust collection device, a second dust collection device (506) is a cloth bag dust collection device, the first dust collection device (505) comprises baffle plates (5051) which are arranged on the inner wall of the first dust collection device (505) in a staggered mode, and an ash outlet (5052) is formed in the bottom of the first dust collection device (505).

8. A boiler combustion solid waste treatment device based on plasma technology according to claim 6, characterized in that: the boiler (3) comprises a hearth (301) and a pulverized coal burner (302), the synthesis gas outlet (201) is connected with a gas-solid separator (303) through a gas pipeline (510), and the gas-solid separator (303) is respectively connected with the hearth (301) and the pulverized coal burner (302) through two conveying pipelines (304).

9. A boiler combustion solid waste treatment process based on a plasma technology is characterized in that: the method specifically comprises the following steps:

s1: the solid waste of each boiler to be treated is loaded into a turnover box (101), sent into a powerful crusher (103) through a lifter (102), crushed in the powerful crusher (103), and then sent into a plasma treatment device (2) by a screw conveyor (104) for waste treatment;

s2: sending the pretreated crushed solid waste into a plasma treatment device (2) from a feeding hole (202), flowing to an incineration zone (204) along a drying zone (203), drying and incinerating under the action of a plasma gun (205), and introducing air through an air inlet (206), so that high-temperature synthesis gas generated by the solid waste enters a tail gas treatment device (5) from a synthesis gas outlet (201) under the action of the air, and generated ash is collected through an ash hopper (208);

s3: the high-temperature synthesis gas entering the tail gas treatment device (5) flows along a gas pipeline (510), firstly, secondary combustion is carried out through a plasma gun (205) in a secondary combustion chamber (501), then, waste heat recovery is carried out through a waste heat recovery device II (502), then, the waste gas after the waste heat recovery is subjected to acid removal, dust removal and denitration treatment sequentially through an acid removal quenching tower (503), a filtering device (504), a dust removal device I (505), a dust removal device II (506) and a denitration device (507), and finally, the generated middle-low temperature tail gas is discharged from a chimney (508) under the action of a draught fan (509);

s4: the dust discharged from the ash outlet (209) is introduced into a cooling tower (403) through an ash pipe (401) and a first waste heat recovery device (402), the ash is cooled into solid metal and molten glass through a spray pipe (404), and then the solid metal and the molten glass are recovered through a slag outlet (408);

s5: and liquid passing through the water-slag separation plate (407) exchanges heat through a heat exchanger (409), and cooling water after heat exchange is conveyed to a spray pipe (404) through a water pump (406) and a circulating pipe (405) to recycle a water source, wherein waste heat recovered by the waste heat recovery device II (502), the waste heat recovery device I (402) and the heat exchanger (409) is conveyed into the boiler (3) through pipelines.