System apparatus and method for comprehensive thermal treatment of solid waste

Abstract

Provided in the present disclosure are a system apparatus and method for comprehensive thermal treatment of solid waste. The system apparatus comprises a hazardous waste gasification system, an industrial solid waste incineration system and a flue gas treatment system. The hazardous waste gasification system comprises a feeding and compatible proportioning part and a gasification part which are connected in sequence, wherein the gasification part comprises four zones, and the four zones, from a feeding position to a discharging position, are sequentially a drying zone, a component devolatilization zone, an oxidation zone and a reduction zone; and the gasification part comprises a first gas outlet used for discharging a gas. The industrial solid waste incineration system comprises an incineration apparatus, wherein the first gas outlet is connected to the incineration apparatus. The method comprises: after undergoing compatible proportioning, hazardous waste entering a gasification part to be sequentially subjected to drying, component devolatilization, oxidation and reduction, to obtain a first gas containing a combustible gas; and industrial solid waste entering an incineration apparatus and being incinerated under the action of the first gas, and a flue gas obtained after incineration being subjected to flue gas treatment and then discharged outwards. By means of the present disclosure, resources can be fully utilized, and the economic benefits can be improved.

Description

A system device and method for comprehensive thermal treatment of solid waste Technical Field

[0001] The present disclosure relates to the technical field of comprehensive thermal treatment of solid waste, and in particular to a system device and method for comprehensive thermal treatment of solid waste. Background Art

[0002] Solid waste refers to solid, semi-solid and gaseous items in containers that have lost their original use value or have been discarded in production, life and other human activities, as well as items and substances included in solid waste management according to laws and administrative regulations.

[0003] Solid waste has many serious harms to the environment, which are mainly reflected in the following aspects:

[0004] (1) Land occupation: If solid waste cannot be treated and disposed of in a timely manner, it will occupy a large amount of land, thereby destroying the landform, vegetation, natural landscape and agricultural production.

[0005] (2) Soil pollution: If solid waste is not properly handled, harmful components can easily flow into the soil through surface runoff, killing beneficial microorganisms in the soil and destroying the soil structure, thereby causing deterioration of soil conditions.

[0006] (3) Pollution of water bodies: Solid waste can enter surface runoff through natural precipitation, wind drift, etc., and then enter water bodies such as rivers and lakes, causing surface water pollution.

[0007] (4) Damage to the atmosphere: Some solid wastes produce large amounts of harmful gases, such as sulfur dioxide, due to chemical reactions. Some solid wastes release large amounts of flammable, toxic and harmful gases due to fermentation. These gases will directly diffuse into the atmosphere and pollute it.

[0008] (5) Toxic and harmful: Some solid wastes may also cause special damage, such as combustion, explosion, contact poisoning and corrosion.

[0009] (6) Toxic to humans: Solid waste can also indirectly harm human health through plants and animals, such as heavy metal pollution in the food chain. It is very necessary to develop a comprehensive and integrated treatment plan for the solid waste generated.

[0010] The purpose of integrated treatment is to centralize various wastes in a specific location and, based on the characteristics of the solid waste, combine various waste treatment processes into a single system to rationally and centrally utilize the materials and energy generated by each process. Integrated treatment can effectively dispose of waste, reduce final waste emissions, mitigate regional environmental pollution, and prevent the spread of secondary pollution, all while keeping overall treatment costs low and resource utilization efficient.

[0011] Lithium battery recycling companies generally outsource the disposal of hazardous waste generated by battery recycling companies and high-water content solid waste generated by wet recycling processes. So far, they have not developed a comprehensive treatment method that can reduce the amount of waste, make it harmless, and utilize resources. This not only results in huge production costs but also causes a lot of waste of resources.

[0012] As the scale of lithium battery recycling expands, the hazardous waste and general industrial solid waste generated during the recycling process will gradually increase. Irrational disposal will cause damage to the environment and further affect the healthy development of the industry.

[0013] Summary of the Invention

[0014] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0015] In view of the problems existing in the prior art, the present disclosure provides a system device and method for comprehensive thermal treatment of solid waste, which can separately treat hazardous waste and general industrial solid waste generated in lithium battery recycling enterprises, thereby avoiding hazards caused during the treatment of hazardous waste and achieving the reduction, harmlessness and resource-based disposal of solid waste, making full use of resources, increasing social and economic benefits, reducing the amount of waste discharged and disposed of, and benefiting the development of enterprises.

[0016] To achieve this goal, the present disclosure adopts the following technical solutions:

[0017] In a first aspect, the present disclosure provides a system device for comprehensive thermal treatment of solid waste, the system device including a hazardous waste gasification system, an industrial solid waste incineration system and a flue gas treatment system; the hazardous waste gasification system includes a feed matching section and a gasification section connected in sequence; the gasification section includes four areas, which are a drying area, a devolatilization area, an oxidation area and a reduction area from the feed point to the discharge point; the gasification section includes a first gas outlet for gas discharge; the industrial solid waste incineration system includes a incineration device; the first gas outlet is connected to the incineration device; the flue gas outlet of the industrial solid waste incineration system is connected to the flue gas treatment system.

[0018] The system device for comprehensive thermal treatment of solid waste provided by the present disclosure has the following three advantages:

[0019] 1. The hazardous waste gasification system includes a feed matching section. The feed matching section described in the present disclosure is not a conventional feed section, but can match hazardous wastes according to their different characteristics, so that their physical and chemical properties meet specific requirements, so that no hazardous products or dangerous accidents will occur when they are subsequently gasified in the gasification section; the reason for choosing matching in the present disclosure is to ensure that the calorific value of the material entering the rotary kiln is stable within a certain range, to ensure the economy and reliability of the system operation; to control the proportion of halides and organic matter, so as to reduce the corrosion of acidic pollutants in the flue gas generated by their combustion to subsequent treatment equipment; to control the content of halides and heavy metals, to ensure the flue gas treatment effect and normal tail gas emissions; to control the content of chlorine-containing organic waste, to reduce the production of dioxins during the incineration process from the source; to control the content of low-melting-point alkali metals, etc., to prevent system coking and structural blockage, and reduce the impact on refractory materials; to control the stability of the moisture content of the material, to ensure the normal drying stage of the waste, and to improve the waste disposal efficiency.

[0020] 2. The gasification section of the present disclosure includes a drying zone, a devolatilization zone, an oxidation zone, and a reduction zone. Hazardous waste passes through these four zones in sequence and is ultimately converted into harmless combustible gas.

[0021] 3. The present invention provides a first gas outlet connected to the incineration device, so that the first gas of the harmless combustible gas produced by the gasification part can be introduced into the incineration device for use as fuel, thereby saving the amount of fuel used in the incineration device and effectively reducing energy consumption; at the same time, the flue gases such as nitrogen oxides and sulfur oxides contained in the gas discharge of the hazardous waste gasification part are also synergistically treated by the flue gas treatment system after the industrial solid waste incineration system, saving equipment costs.

[0022] In one embodiment, the feed mixing unit includes a first conveying device, a crushing device, a mixing device and a second conveying device connected in sequence.

[0023] The feed mixing unit disclosed in the present invention can make the material to be processed uniform in texture and balanced in calorific value; and the system can effectively solve the problem of conveying barreled waste, especially barreled waste with solidified or semi-solidified contents, packaged viscous waste and other media that are difficult to convey by other conventional conveying methods.

[0024] In one embodiment, the first transport device comprises a lifting machine.

[0025] In one embodiment, the second conveying device comprises a screw conveyor.

[0026] In one embodiment, the mixing device is provided with a stirring element for uniformly mixing the materials.

[0027] In one embodiment, the second conveying device is connected to the bottom of the mixing device through a pipeline.

[0028] The feed matching part disclosed in the present invention preferably adopts an SMF system, that is, a crushing device + a mixing device + a second conveying device (screw conveyor), wherein the hazardous waste is fed into the feed hopper of the crushing device through the feeding equipment of the lifting machine, and enters the mixing device through the chute after crushing. Sludge, waste liquid or wastewater with a higher liquid content is added to the mixing device according to the system conditions to adjust the calorific value and fluidity of the mixed slurry. These sludge, waste liquid or wastewater can also be directly added to the crushing device, and enter the mixing device after crushing to obtain a uniformly mixed material; the uniformly mixed slurry / paste is transported into the gasification part through the screw conveyor connected to the bottom of the mixing device.

[0029] In one embodiment, the feed mixing section is a closed space.

[0030] The present invention can optionally adopt closed treatment to avoid the overflow of dust, odor, etc. during the pretreatment process, improve the sanitary conditions of the operation site, reduce or avoid direct contact between personnel and waste during the pretreatment process, and improve operational safety.

[0031] In one embodiment, the gasification section includes a gasification rotary kiln.

[0032] In one embodiment, the industrial solid waste incineration system further includes a solid waste feeding device disposed before the incineration device, and a cooling device and an ash recovery device disposed after the incineration device.

[0033] In one embodiment, the solid waste feeding device includes a metering part and a conveying part connected in sequence.

[0034] In one embodiment, the metering portion includes a box feeder.

[0035] In one embodiment, the conveying part includes a belt conveyor, a double-shaft mixer, a feeding belt conveyor and a receiving device connected in sequence.

[0036] In one embodiment, an iron remover is provided on the upper portion of the belt conveyor, which can remove magnetic metal substances or metal oxides in industrial solid waste, thereby reducing the generation of heavy metal dust.

[0037] In one embodiment, the firing device includes a firing rotary kiln.

[0038] In one embodiment, an auxiliary burner is provided inside the sintering device.

[0039] The setting of auxiliary burners can make up for the lack of self-combustion and increase the high-temperature ambient temperature.

[0040] In one embodiment, the cooling device includes a cooling rotary kiln, which is used to cool the fired materials in a timely manner.

[0041] In one embodiment, the ash recovery device includes a crushing part, a conveying part, and a storage part connected in sequence.

[0042] In one embodiment, the flue gas treatment system includes a cooling device, a first dust removal device, a dry deacidification device, a second dust removal device, a wet deacidification device, a flue gas reheating device and a denitrification device connected in sequence.

[0043] To prevent low-temperature condensation and corrosion of subsequent equipment caused by excessively low flue gas temperatures, the flue gas after the wet deacidification unit passes through a flue gas reheating unit. The heated flue gas then enters the denitrification unit, a medium- and low-temperature SCR denitrification system that removes nitrogen oxides and has a 40-70% removal rate for dioxins. The flue gas is then treated through various processes to meet standards before being discharged. Advanced flue gas treatment processes ensure effective flue gas purification.

[0044] In one embodiment, the cooling device includes an air-cooling cooling part and / or a water-cooling cooling part.

[0045] The outlet area of ​​the present invention is provided with an emergency cooling device, taking double insurance measures into consideration, and an air-cooled cooling part and a water-cooled cooling part are provided at the same time, which are generally a cold air valve and a clean water spray gun.

[0046] In one embodiment, the dust removal device comprises a cyclone dust collector.

[0047] In one embodiment, a dust outlet is provided at the lower portion of the first dust removal device, and the dust outlet is connected to the gasification rotary kiln.

[0048] In one embodiment, the dry desulfurization device includes a slaked lime adding component, an activated carbon adding component, and a neutralization reaction space; the slaked lime adding component and the activated carbon adding component are both connected to the neutralization reaction space.

[0049] In the dry desulfurization device disclosed herein, SO2 and HF react with injected slaked lime (Ca(OH)2) to neutralize the acidic gases in the flue gas, and activated carbon injection is used in conjunction with a subsequent bag filter, where activated carbon is injected into the flue gas, causing the two to mix strongly and adsorb pollutants such as PCDD / DFs and heavy metals.

[0050] In one embodiment, the second dust removal device comprises a bag filter. The dry desulfurization gas is continuously adsorbed and captured by the bag filter, and the activated carbon adsorbing pollutants is separated from the flue gas. Fly ash from the bag filter is removed at regular intervals, thereby removing pollutants from the flue gas. After further dust removal by the bag filter, the flue gas enters the wet deacidification device, which more thoroughly removes acidic gases from the flue gas.

[0051] In one embodiment, the flue gas treatment system includes a scraper conveyor provided below the bag filter device.

[0052] In one embodiment, the flue gas treatment system includes a precooler disposed between the second dust removal device and the wet desulfurization device.

[0053] In one embodiment, the wet desulfurization device includes a primary deacidification tower and a secondary deacidification tower connected in sequence.

[0054] In one embodiment, the denitration device comprises a medium-low temperature SCR denitration device.

[0055] In one embodiment, the flue gas reheating device is a GGH flue gas heat exchanger.

[0056] In one embodiment, the flue gas treatment system further includes an NGH / SGH flue gas heater, an induced draft fan, and an external exhaust chimney arranged after the SCR denitrification device along the flue gas conveying direction.

[0057] In a second aspect, the present disclosure provides a method for comprehensive thermal treatment of solid waste, which is carried out using the system device for comprehensive thermal treatment of solid waste described in the first aspect.

[0058] As an optional technical solution for the second aspect, the method includes: hazardous wastes are compounded to obtain a compounded material. The compounded material enters a gasification unit and is sequentially dried, devolatilized, oxidized, and reduced to obtain a first gas containing a combustible gas; the industrial solid waste enters a calcining unit and is calcined under the action of the first gas, and the flue gas from the calcination is discharged after flue gas treatment.

[0059] In the comprehensive thermal treatment method for solid waste provided by the present disclosure, hazardous waste is gasified in a gasification rotary kiln under controlled oxygen. The material undergoes four processes within the kiln: ① Drying: When the solid waste is heated to 200-300°C, the water in the raw materials evaporates first, leaving the raw materials and water vapor as the products. ② Devolatilization (pyrolysis): When the temperature reaches 300-500°C, the solid waste rapidly decomposes in the absence of oxygen or air, releasing a large amount of gases such as tar, CO2, CO, CH4, H2, and semi-coke. ③ Oxidation: At temperatures of 500-800°C, the semi-coke reacts with oxygen to produce CO2, and the hydrogen in the solid waste is oxidized to produce water. The oxidation reaction releases a large amount of heat, which is used to maintain the temperature conditions for the gasification reaction. If incomplete oxidation of carbon occurs, CO can be produced. ④ Reduction: In the absence of oxygen and at temperatures of 800-1000°C, the combustion products and water vapor in the oxidation layer react with the charcoal in the reduction layer to produce hydrogen and carbon monoxide. These four processes correspond to four zones within the gasification rotary kiln. In actual operation, there are no strict boundaries between these zones; they interpenetrate and intersect. Hazardous waste undergoes the complete transformation of gasified materials into combustible gas by passing through these four zones within the gasification rotary kiln.

[0060] The present invention adopts gasification treatment to treat hazardous waste, which can make full use of organic matter in hazardous waste and generate combustible gas for secondary utilization. Moreover, due to its oxygen-controlled gasification, the amount of flue gas generated is small, the equipment selection is small and can be highly centralized, fully enclosed and automatically controlled, reducing the impact of human factors on equipment operation and ensuring the continuity and stability of equipment operation.

[0061] In one embodiment, the hazardous waste is any one or a combination of at least two of HW06 waste organic solvents and wastes containing organic solvents, HW08 waste mineral oils and wastes containing mineral oils, HW09 oil / water, hydrocarbon / water mixtures or emulsions, HW11 distillation residues, HW13 organic resin wastes, or HW49 other wastes.

[0062] In one embodiment, the industrial solid waste includes any one or a combination of at least two of calcium-containing waste, mineral waste, inorganic wastewater sludge, organic wastewater sludge, desulfurization gypsum, or desulfurization gypsum.

[0063] It is worth noting that there are many hazardous wastes and general industrial solid wastes in lithium battery recycling companies. Hazardous wastes come from processes such as flue gas disposal, wastewater treatment or solution extraction. Hazardous waste substances include waste activated carbon, oily waste liquid, dehydrated sludge, waste mineral oil, waste engine oil or waste organic solvents, etc.; while general industrial solid wastes come from processes such as leaching and impurity removal, wastewater treatment or battery pretreatment. The specific substances of general industrial solid wastes include any one of iron-aluminum slag, calcium-magnesium slag or calcium phosphate slag, or a combination of at least two. Due to the particularity of hazardous wastes, if they are placed together with general industrial solid wastes for incineration, the general industrial solid wastes must also be treated as hazardous wastes, which will greatly increase the disposal cost. Therefore, the present disclosure adopts a method of gasifying hazardous wastes after mixing them so that they do not produce hazardous gases. The halogen-containing substances in the hazardous wastes include any one of HW06 waste organic solvents and organic solvent-containing wastes, HW09 oil / water, hydrocarbon / water mixtures or emulsions, or HW13 organic resin wastes, or a combination of at least two.

[0064] In one embodiment, the calorific value of the formulated material ranges from 10,000 to 16,000 kJ / kg, for example, 10,000 kJ / kg, 10,600 kJ / kg, 11,300 kJ / kg, 12,000 kJ / kg, 12,600 kJ / kg, 13,300 kJ / kg, 14,000 kJ / kg, 14,600 kJ / kg, 15,300 kJ / kg or 16,000 kJ / kg, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0065] The calorific value range of the materials after compounding disclosed in the present invention is controlled within the above range, which can not only take into account the treatment of low calorific value materials, but also avoid the situation where the calorific value is insufficient and cannot be gasified.

[0066] In one embodiment, the mass fraction of the halogen element in the compounded material is ≤3%, for example, it can be 3%, 2.9%, 2.8%, 2.7%, 2.5%, 2.2%, 2.0%, 1.8%, 1.5%, 1.0%, 0.9% or 0.8%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0067] The present disclosure can effectively avoid the generation of large amounts of acidic gases that may corrode equipment by controlling the mass fraction of halogen elements, thereby ensuring the service life of the equipment.

[0068] In one embodiment, the particle size of the compounded material is 80 to 120 mm, for example, 80 mm, 85 mm, 89 mm, 94 mm, 98 mm, 103 mm, 105 mm, 110 mm, 115 mm or 120 mm, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0069] The present disclosure controls the particle size of the formulated material within the above range, which can ensure the contact between the material and the gasifying agent, and ensure the drying, gasification, oxidation and reduction effects of the material in the gasification section, so as to better ensure that safe combustible gas is obtained at the outlet of the gasification section.

[0070] In one embodiment, the bulk density of the material is 0.2 to 0.4 t / m 3 , for example, it can be 0.2t / m 3 , 0.23t / m 3 , 0.25t / m 3 , 0.27t / m 3 , 0.29t / m 3 , 0.32t / m 3 , 0.34t / m 3 , 0.36t / m 3 , 0.38t / m 3 or 0.4t / m 3 The above values ​​are not limited to the above values, and other values ​​not listed in the above values ​​are also applicable.

[0071] The present disclosure controls the bulk density of the material within the above range, which can ensure that the material has good air permeability.

[0072] In one embodiment, the mixed material contains 18-25% moisture, for example, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 22%, 23%, 24% or 25%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0073] In one embodiment, a gasifying agent is also introduced into the gasification section.

[0074] In one embodiment, the gasifying agent includes any one of air, oxygen, water vapor or water vapor-air.

[0075] The present invention adopts air gasification to gasify the calorific value of the combustible gas in the range of 4 to 7 MJ / m 3 The calorific value of combustible gas using oxygen gasification can reach 15MJ / m 3 .

[0076] In one embodiment, the ER in the gasification section is 0.19 to 0.43, for example, 0.19, 0.22, 0.25, 0.27, 0.3, 0.33, 0.35, 0.38, 0.41, or 0.43, but is not limited to the listed values. Other values ​​not listed within this range are also applicable. ER = actual oxygen supply / fuel amount / (theoretical oxygen demand / fuel amount).

[0077] The present invention adopts the above-mentioned ER for gasification, and the generated combustible gas is introduced into the general industrial solid waste incineration system for use as auxiliary fuel, and its partial medium-temperature gasification (500-800°C) brings fewer harmful elements into the gas, and the flue gas pollutants after combustion as fuel are less, which can effectively reduce the amount of dioxin produced. The main reasons are: ① The generation of dioxin precursors is reduced; ② The valuable metals in the hazardous waste are not oxidized, and the metals such as Cu and Fe in the hazardous waste are not easy to generate catalysts that promote the generation of dioxins. At the same time, gasification has its advantages: ① The preparation of fuel gas; ② The air coefficient is low when the pyrolysis gas is burned, which can greatly reduce the amount of smoke exhaust, improve energy utilization, and reduce NO x emission, and reduce the investment and operating costs of flue gas treatment equipment.

[0078] It is worth noting that the difficulty of the present disclosure lies in ensuring that the hazardous waste is fully treated and that the gas material does not contain any hazardous gas phase, that is, no longer contains flammable and explosive organic gases, while also ensuring that the generated combustible gas is fully utilized and does not directly convert into water and carbon dioxide within the gasification section. Therefore, the ER control of the present disclosure is very critical and can match the temperature to ensure that the hazardous waste undergoes drying, devolatilization, oxidation and reduction reactions in the gasification section in sequence, and the final combustible gas contains CO and H2. When the ER is low, it is easy to cause insufficient oxygen supply for the early oxidation, making it difficult for oxidation to proceed fully, resulting in incomplete oxidation and decomposition of the material, and directly causing its own cracking reaction, ultimately failing to obtain the desired gas components; when the ER is high, the reduction stage after the oxidation stage cannot proceed, and the oxidation reaction continues. The generated CO and H2 directly react to form CO2 and H2O, which cannot be used as fuel for ordinary solid waste, and resources are difficult to combine.

[0079] In one embodiment, the drying temperature in the gasification section is 200-300°C, for example, 200°C, 215°C, 225°C, 235°C, 240°C, 250°C, 267°C, 270°C, 280°C or 300°C, but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0080] In one embodiment, the temperature of the devolatilization component in the gasification section is 300-500° C., for example, 300° C., 325° C., 345° C., 365° C., 385° C., 415° C., 435° C., 455° C., 478° C. or 500° C., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0081] In one embodiment, the devolatilization of components in the gasification section includes decomposition of materials to produce decomposition gas and semi-coke.

[0082] In one embodiment, the decomposition gas comprises any one or a combination of at least two of tar, CO2, CO, CH4 or H2, wherein typical but non-limiting combinations are a combination of tar and CO2, a combination of CO and CO2, a combination of tar and CO, a combination of CH4 and CO2, and a combination of H2 and CO2.

[0083] In one embodiment, the oxidation in the gasification section comprises reacting the semi-char with oxygen to produce carbon oxides and water.

[0084] In one embodiment, the carbon oxides include carbon monoxide and / or carbon dioxide.

[0085] In one embodiment, the oxidation temperature in the gasification section is 500-800°C, for example, 500°C, 550°C, 600°C, 650°C, 680°C, 700°C, 750°C or 800°C, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0086] In one embodiment, the reduction temperature in the gasification section is 800-1000°C, for example, it can be 800°C, 820°C, 845°C, 860°C, 885°C, 915°C, 935°C, 955°C, 975°C or 1000°C, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0087] In one embodiment, the reduction in the gasification section includes: the oxidation product and water vapor react with charcoal to generate hydrogen and carbon monoxide.

[0088] The charcoal disclosed in the present invention is derived from the charcoal produced during the early devolatilization and oxidation process of organic matter contained in hazardous waste, or the charcoal added during the mixing process.

[0089] As mentioned above, the key to the present disclosure lies in the drying, devolatilization, oxidation and reduction processes, so the temperature selection and reaction progress of each stage are crucial for ultimately obtaining a safe gas output containing combustible gas.

[0090] In one embodiment, the sintering temperature is 1100-1200°C, for example, it can be 1100°C, 1110°C, 1120°C, 1130°C, 1140°C, 1150°C, 1160°C, 1170°C, 1180°C or 1200°C, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0091] In one embodiment, the flue gas outlet temperature of the burning is ≤240°C, for example, it can be 240°C, 235°C, 230°C, 225°C, 220°C, 215°C or 210°C, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0092] In one embodiment, the outer surface temperature of the rotary kiln during the firing is ≤200°C, for example, it can be 200°C, 195°C, 190°C, 185°C, 180°C, 175°C, 170°C, 165°C, 160°C, 155°C or 150°C, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0093] In one embodiment, the method further comprises: the material produced by the sintering enters a cooling rotary kiln, is cooled, and then enters an ash recovery device for recovery. The present disclosure can recover the ash and perform subsequent resource utilization.

[0094] In one embodiment, the discharge temperature of the cooling rotary kiln is ≤100°C, for example, it can be 100°C, 98°C, 97°C, 95°C, 90°C, 88°C, 85°C, 80°C, 75°C or 70°C, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0095] In one embodiment, the flue gas after incineration is cooled to ≤200°C and then subjected to dust removal, desulfurization, heating, denitrification, and emission. For example, the temperature may be 200°C, 195°C, 190°C, 185°C, 180°C, 175°C, 170°C, 165°C, or 160°C, but is not limited to the listed values. Other values ​​not listed within this range are also applicable. The flue gas treatment system provided by the present disclosure can treat the flue gas generated by the hazardous waste gasification system and the industrial solid waste incineration system together, saving equipment costs, and the treated exhaust gas meets the emission standards.

[0096] Compared with the prior art, the present disclosure has at least the following beneficial effects:

[0097] (1) The system device for comprehensive thermal treatment of solid waste provided by the present disclosure is provided with a hazardous waste gasification system and an industrial solid waste incineration system for separately treating hazardous waste and general industrial solid waste. This system not only can realize the conversion of hazardous waste into combustible gas, but also can use combustible gas as fuel for the industrial solid waste incineration system, thereby saving fuel, achieving full utilization of resources, and realizing resource-based treatment of waste materials.

[0098] (2) The method of comprehensive thermal treatment of solid waste provided by the present disclosure forms materials of specific properties through compounding hazardous waste and then gasifies them, thereby ensuring that less harmful gases are generated and that relatively clean combustible gases can be obtained after drying, devolatilization, oxidation and reduction, thereby significantly reducing the amount of waste discharged and disposed of.

[0099] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] The accompanying drawings are used to provide a further understanding of the technical solution of this article and constitute a part of the specification. Together with the embodiments of this application, they are used to explain the technical solution of this article and do not constitute a limitation on the technical solution of this article.

[0101] FIG1 is a diagram of a system device for comprehensive thermal treatment of solid waste provided in Example 1 of the present disclosure.

[0102] FIG2 is a diagram of the hazardous waste gasification system in FIG1 .

[0103] FIG3 is a diagram of the industrial solid waste incineration system in FIG1 .

[0104] FIG4 is a diagram of the flue gas treatment system in FIG1 .

[0105] Figure 1: Hazardous waste gasification system; 11. Roller conveyor; 12. First elevator; 13. Homogenizer; 14. Crusher; 15. Feed hopper; 16. Gate valve; 17. Combustion-supporting fan; 18. Single shaftless screw conveyor; 19. Burner; 110. Waste liquid spray gun; 111. Gasification rotary kiln; 112. Slag remover; 113. Ash settling chamber; 114. Emergency discharge valve; 2. Industrial solid waste incineration system; 21. Raw material yard; 22. Raw material transport vehicle; 23. Box feeder; 24. Belt conveyor; 25. Iron remover; 26. Double-shaft mixer; 27. Feed belt conveyor; 28. Feed inclined chute; 29. ​​Incineration recirculation system Rotary kiln; 210. Auxiliary burner; 211. Cooling rotary kiln; 212. Jaw crusher; 213. Discharge scraper; 214. Second elevator; 215. Distribution scraper; 216. Dry material silo; 3. Flue gas treatment system; 31. Activated carbon dosing component; 32. Slaked lime dosing component; 33. Cooling device; 34. Cyclone dust collector; 35. Bag dust collector; 36. Scraper conveyor; 37. Precooler; 38. Primary deacidification tower; 39. Secondary deacidification tower; 310. GGH flue gas heat exchanger; 311. SCR denitrification device; 312. NGH / SGH flue gas heater; 313. Induced draft fan; 314. External exhaust chimney.

[0106] In the figure, A represents steam, B represents cooling water, C represents gaseous material; D represents slag transportation and disposal, E represents slag, and the waste liquid sprayed into the waste liquid spray gun is organic waste liquid; F represents flue gas. DETAILED DESCRIPTION

[0107] The technical solution of the present disclosure will be further explained below with reference to the accompanying drawings and through specific implementation methods.

[0108] The present disclosure is further described below. However, the following examples are merely simplified examples of the present disclosure and do not represent or limit the scope of protection of the present disclosure. The scope of protection of the present disclosure shall be subject to the claims.

[0109] It should be understood that, in the description of the present disclosure, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and the like may explicitly or implicitly include one or more of such features. In the description of the present disclosure, unless otherwise specified, "multiple" means two or more.

[0110] It should be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0111] Those skilled in the art should understand that the present disclosure necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main disclosure points of the present disclosure. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present disclosure does not make special requirements and specific limitations on this.

[0112] Example 1

[0113] The present embodiment provides a system device for comprehensive thermal treatment of solid waste, as shown in Figures 1 to 4, the system device for comprehensive thermal treatment of solid waste includes a hazardous waste gasification system 1, an industrial solid waste incineration system 2 and a flue gas treatment system 3; the hazardous waste gasification system 1 includes a feed matching section and a gasification section connected in sequence; the gasification section includes four areas, and the four areas are a drying area, a devolatilization area, an oxidation area and a reduction area from the feed point to the discharge point; the gasification section includes a first gas outlet for gas discharge (used for delivering gas materials, represented by C in the figure); the industrial solid waste incineration system 2 includes a incineration device; the first gas outlet is connected to the incineration device; the flue gas outlet of the industrial solid waste incineration system is connected to the flue gas treatment system.

[0114] The feed matching section includes a first conveying device, a crushing device, a mixing device, and a second conveying device connected in sequence; the first conveying device includes a lifting machine, namely a first elevator 12; a roller conveyor 11 is also provided before the first elevator 12; the crushing device is a crusher 14, and the mixing device is provided with a stirring element for uniformly mixing the materials, namely a homogenizer 13; the second conveying device includes a screw conveyor, namely a single shaftless screw conveyor 18; the second conveying device is connected to the bottom of the mixing device through a pipeline; the feed matching section is a closed space; the gasification section includes a gasification rotary kiln 111. The kiln head of the gasification rotary kiln 111 is provided with a burner 19, and is provided with an inlet for combustion-supporting materials and an inlet for waste liquid. A waste liquid spray gun 110 is provided at one end of the waste liquid inlet near the kiln head. The kiln tail of the gasification rotary kiln 111 is connected to a soot settling chamber 113. A conveying pipeline for conveying flue gas to the industrial solid waste incineration system is provided at the upper part of the soot settling chamber 113, and an emergency discharge valve 114 is provided on the conveying pipeline. The emergency discharge valve is used to deal with emergencies; a slag scooping machine 112 is provided at the lower part of the soot settling chamber 113, and the slag scooping machine 112 is used to collect the slag in time and transport it for treatment.

[0115] The industrial solid waste incineration system 2 also includes a raw material stacking section and a solid waste feeding device arranged before the incineration device, as well as a cooling device and an ash recovery device arranged after the incineration device; the raw material stacking section includes a raw material yard 21 and a raw material transport vehicle 22 for transporting the raw materials to the solid waste feeding device; the solid waste feeding device includes a metering section and a conveying section connected in sequence; the metering section includes a box feeder 23; the conveying section includes a belt conveyor 24, a double-shaft mixer 26, a feeding belt conveyor 27 and a receiving device connected in sequence, and the receiving device is a feeding inclined chute 28 (with a gravity double flap valve); the upper part of the belt conveyor 24 is provided with an iron removal device. device 25; the firing device includes a firing rotary kiln 29; the firing rotary kiln 29 is a countercurrent rotary kiln; the flue gas (indicated by F) generated by the firing rotary kiln 29 is transported to the flue gas treatment system 3 for flue gas treatment; an auxiliary burner 210 is provided inside the firing device; the cooling device includes a cooling rotary kiln 211; the ash recovery device includes a crushing part, a conveying part and a storage part connected in sequence, the crushing part is a jaw crusher 212, the conveying part includes a discharging scraper 213, a second elevator 214 and a distribution scraper 215 connected in sequence, and the storage part includes a dry material bin 216 for receiving the material distributed by the distribution scraper 215.

[0116] The flue gas treatment system 3 includes a cooling device 33, a first dust removal device, a first deacidification device, a second dust removal device, a second deacidification device, a flue gas reheating device and a denitrification device connected in sequence; the cooling device 33 includes an air-cooled cooling part and a water-cooled cooling part; the first dust removal device includes a cyclone dust collector 34; a dust outlet is provided at the lower part of the first dust removal device, and the dust outlet is connected to the gasification rotary kiln 111; the dry desulfurization device (first deacidification device) includes a slaked lime feeding component 32, an activated carbon feeding component 31 and a neutralization reaction space (flue gas conveying pipeline); the slaked lime feeding component 32 and the activated carbon feeding component 31 are both connected to the neutralization reaction space; the second dust removal device includes a bag dust removal device 35; a scraper conveyor 36 is provided at the lower part of the bag dust removal device 35, and the upper gas outlet of the bag dust removal device 35 is connected to the precooler 37; the pre The cooler 37 is connected to the wet desulfurization device (second deacidification device), which includes a primary deacidification tower 38 and a secondary deacidification tower 39 connected in sequence; the flue gas reheating device is a GGH flue gas heat exchanger 310, and the denitrification device includes a medium and low temperature SCR denitrification device 311. The flue gas treatment system 3 also includes an NGH / SGH flue gas heater 312, an induced draft fan 313 and an external exhaust chimney 314 arranged after the SCR denitrification device 311 along the flue gas conveying direction.

[0117] Application Example 1

[0118] The hazardous wastes generated by lithium battery companies mainly include waste activated carbon, oily waste liquid, dehydrated sludge, etc. The types of waste are relatively simple and the calorific value is high.

[0119] This application example provides a method for comprehensive thermal treatment of solid waste, which includes: hazardous waste is transferred into a feed hopper, transported into the feed hopper by a roller conveyor and a first elevator, and then the gate valve is used to control the material to fall into a crusher, and the material is crushed and refined to an average particle size of about 100 mm. The crushed material is sent to a homogenizer for mixing and homogenization, and oil-containing waste liquid is added to the homogenizer to adjust the calorific value and fluidity of the mixed slurry; so as to achieve the effect of matching, so that the texture of the material to be treated is uniform and the calorific value is balanced (waste liquid can also be sprayed from a waste liquid spray gun at the same time as entering the gasification rotary kiln for calorific value regulation); and then the matched material is evenly sent to the gasification rotary kiln through a screw conveyor for gasification reaction. After the hazardous waste is matched, the matched material is obtained (calorific value range is 14000kJ / kg; the mass fraction of halogen elements is 2.5%; the average particle size is 99.8mm; the material bulk density is 0.35t / m 3 ).

[0120] The mixed materials enter the gasification rotary kiln and are sequentially dried, devolatilized, oxidized and reduced to obtain a first gas containing combustible gas; specifically, a gasifying agent is also introduced into the gasification rotary kiln; the gasifying agent includes any one of air, oxygen, water vapor or water vapor-air; the ER in the gasification rotary kiln is 0.4, wherein the ER = actual oxygen supply / fuel amount / (theoretical oxygen demand / fuel amount); the drying temperature in the gasification rotary kiln is 250°C; the devolatilization temperature in the gasification rotary kiln is 350°C; the gasification rotary kiln is 10 ... Devolatilization in the rotary kiln includes decomposition of materials to produce decomposition gas and semi-coke; the decomposition gas includes tar, CO2, CO, CH4 and H2; oxidation in the gasification rotary kiln includes reaction of semi-coke with oxygen to produce carbon oxides and water; the carbon oxides include carbon monoxide and / or carbon dioxide; the oxidation temperature in the gasification rotary kiln is 600°C; the reduction temperature in the gasification rotary kiln is 900°C; the reduction in the gasification rotary kiln includes: oxidation products and water vapor react with charcoal to generate a first gas containing hydrogen and carbon monoxide.

[0121] The reactions occurring in the gasification rotary kiln in this application example are shown in Table 1.

[0122] Table 1

[0123] In Table 1, n, m, x, and y all represent the number of carbon and hydrogen atoms in hydrocarbons. There is no special restriction on their value range. The material components in hazardous wastes are complex and difficult to define, so no special restrictions are imposed on them.

[0124] The general solid waste generated by lithium battery companies mainly includes iron-aluminum slag, calcium-magnesium slag and calcium phosphate slag, which have a high moisture content of about 45% and basically no calorific value. A general industrial solid waste incineration system is set up to dispose of them.

[0125] Specifically, industrial solid waste enters the incineration rotary kiln and is incinerated under the action of the first gas, and the flue gas after incineration is discharged after flue gas treatment. More specifically, the heat source of the industrial solid waste incineration system adopts the first gas generated by the gasification rotary kiln, and biomass fuel is used as an auxiliary fuel. Various types of slag piles and temporary storage warehouses are loaded, stacked and mixed using raw material conveyor vehicles (forklifts), which deliver the materials to the box feeder, which feeds the materials evenly to the belt conveyor according to the working conditions; a double-shaft mixer is set between the belt conveyor and the feed belt conveyor to crush and mix the materials; the belt conveyor in front of the double-shaft mixer is equipped with a permanent magnetic iron remover to absorb iron and foreign matter. The twin-shaft mixer is equipped with one inlet and two outlets to ensure that the material can directly cross over and enter the feeding belt conveyor when it does not need to be stirred; the rotary kiln adopts a feeding inclined chute for feeding, and a gravity double flap valve is set to lock the air to feed the material into the firing rotary kiln. The firing rotary kiln adopts a countercurrent kiln. After the wet material enters the kiln head of the firing rotary kiln, it slowly moves forward in a spiral from the kiln head to the kiln tail as the kiln body rotates. The firing temperature of the firing rotary kiln is 1150℃. The hot flue gas flows in the opposite direction of the material and countercurrently. The residual heat of the flue gas gradually pyrolyzes, dries and preheats the material in the kiln, and the temperature of the flue gas out of the kiln drops to 2 The calcined material is screened by the mesh screening device, and the powder directly enters the undersize discharging scraper; the large block material enters the jaw crusher for coarse crushing and then enters the undersize discharging scraper, and is transported to the distribution scraper together with the powder through the second elevator, and enters the dry material silo for temporary storage through the discharge port below the distribution scraper. A dust collector system is set on the top of the dry material silo, and a discharge device is set at the bottom of the dry material silo for discharging.

[0126] The flue gas generated by the firing rotary kiln enters a cyclone dust collector to remove large particles, is collected by a rear hopper and discharged through ash conveying equipment, and is then recycled back to the firing rotary kiln for disposal. To prevent the exhaust gas temperature from being too high when entering the exhaust gas treatment system, a cooling device is installed on the inlet pipe of the cyclone dust collector, including an emergency water spray cooling device and a cold air valve. There is a Venturi section on the outlet pipe of the cyclone dust collector, in which slaked lime and activated carbon are sprayed to remove some acidic gases and adsorb dioxins and heavy metal pollutants, respectively. The outlet flue gas of the cyclone dust collector is wrapped with dry agent and activated carbon powder, and enters the bag dust collector to form a layer of filter cake on the surface of the filter bag, which can continue to remove acidic pollutants and adsorb dioxins and heavy metals. The bag dust collector captures most of the dust in the flue gas, which is collected by the ash hopper and discharged by the scraper conveyor. The outlet temperature of the bag dust removal device is about 180℃. After being cooled by water spraying in the precooler, it enters the two-stage wet deacidification tower to further remove acidic pollutants. The deep purification of flue gas pollutants is achieved through circulating spray washing. At the same time, combined with the efficient demisting of the top demister, the flue gas emissions can meet more stringent emission indicators.

[0127] The flue gas temperature leaving the wet deacidification device is reduced to about 75°C. It first enters the GGH flue gas heat exchanger for heat exchange, raising the flue gas temperature to about 130°C. It then passes through the flue gas heater (the heat source uses steam or gas) to continue heating to about 220°C, reaching the appropriate temperature for the medium and low temperature SCR denitrification device, so that the flue gas removes nitrogen oxides under the action of the catalyst. The flue gas after denitrification returns to the hot end of the GGH flue gas heater and serves as a heat source to heat the flue gas at the outlet of the wet system. It is then discharged through the induced draft fan and the external chimney to meet the emission standards.

[0128] Application Example 2

[0129] This application example provides a method for comprehensive thermal treatment of solid waste. The calorific value of the material after the method is 10000kJ / kg; the mass fraction of the halogen element is ≤3%; the average particle size is 118.2mm; the material bulk density is 0.38t / m 3 ; The ER in the gasification rotary kiln is 0.20; the drying temperature in the gasification rotary kiln is 200°C; the temperature of devolatilization in the gasification rotary kiln is 300°C; the temperature of reduction in the gasification rotary kiln is 800°C; and the firing temperature in the firing rotary kiln is 1200°C. The rest are the same as in Application Example 1.

[0130] Application Example 3

[0131] This application example provides a method for comprehensive thermal treatment of solid waste. The calorific value of the material after the method is 16000kJ / kg; the mass fraction of the halogen element is ≤3%; the average particle size is 83.5mm; the material bulk density is 0.21t / m 3; The ER in the gasification rotary kiln is 0.42; the drying temperature in the gasification rotary kiln is 300°C; the temperature of devolatilization in the gasification rotary kiln is 500°C; the temperature of reduction in the gasification rotary kiln is 800°C; and the firing temperature in the firing rotary kiln is 1100°C. The rest are the same as in Application Example 1.

[0132] Application Example 4

[0133] This application example provides a method for comprehensive thermal treatment of solid waste. The method is the same as Application Example 1 except that the ER in the gasification rotary kiln is 0.10.

[0134] In this application example, since the ER in the gasification rotary kiln is too low, the amount of waste burned is small, the heat provided is small, the unburned waste is difficult to dry, and the reduction temperature cannot be reached, so it cannot be gasified to produce combustible gas.

[0135] Application Example 5

[0136] This application example provides a method for comprehensive thermal treatment of solid waste. The method is the same as Application Example 1 except that the ER in the gasification rotary kiln is 0.50.

[0137] In this application example, due to the increase in ER, the material combustion amount increases, the reduction reaction is difficult to proceed, the combustible gas content in the gas leaving the gasification system decreases, and the combustible calorific value decreases.

[0138] Application Example 6

[0139] This application example provides a method for comprehensive thermal treatment of solid waste. The method is the same as that of Application Example 1, except that the mass fraction of the halogen element in the materials after compounding is 4%.

[0140] After the combination, the mass fraction of halogen elements in the materials increases, the amount of dioxins produced during the incineration process increases, the flue gas treatment load increases, it is difficult to ensure the flue gas treatment effect and normal tail gas emissions, and the flue gas treatment operating costs are greatly increased.

[0141] Application Example 7

[0142] This application example provides a method for comprehensive thermal treatment of solid waste. The method is to reduce the bulk density of the material after mixing to 0.6t / m 3 Except for this, the rest are the same as those in Application Example 1.

[0143] In this application example, the material stacking density is too high, which makes it difficult to disperse the material in the kiln, resulting in poor drying, oxidation and reduction effects. There is a lot of unburned carbon black in the discharge material, and the generated combustible gas content is low, and the calorific value is low.

[0144] Application Example 8

[0145] This application example provides a method for comprehensive thermal treatment of solid waste. The method is to reduce the bulk density of the material after mixing to 0.1t / m 3 Except for this, the rest are the same as those in Application Example 1.

[0146] The bulk density of the material in this application example is 0.1t / m 3 When the combustion gas is heated, the amount of combustible gas produced is small.

[0147] Application Example 9

[0148] This application example provides a method for comprehensive thermal treatment of solid waste. The method is the same as that of Application Example 1 except that the reduction temperature in the gasification rotary kiln is 700°C.

[0149] When the reduction temperature in the gasification rotary kiln of this application example is 700°C, it means that the amount of material burned in the oxidation section is reduced and the ER is reduced. Under this working condition, the remaining material does not have enough heat to be completely reduced, the generated combustible gas is reduced, and the amount of unburned material in the discharge is increased.

[0150] Comparative Application Example 1

[0151] This comparative example provides a method for comprehensive thermal treatment of solid waste. The method is the same as that of Application Example 1, except that the first gas generated by the gasification rotary kiln is not used in the burning device.

[0152] In this comparative example, the first gas generated by the gasification rotary kiln is not used in the firing device, so corresponding equipment is still required to treat the flue gas leaving the system, which will increase equipment investment and greatly reduce the heat utilization rate of the combustible gas generated in this part of the flue gas.

[0153] Application Comparative Example 2

[0154] This application example provides a method for comprehensive thermal treatment of solid waste. The method is the same as Application Example 1 except that hazardous waste and general solid waste are directly added to the incineration device at the same time, that is, no hazardous waste gasification system is used.

[0155] If hazardous waste and general solid waste are incinerated at the same time in this application comparison, the general solid waste must also be disposed of as hazardous waste, which will greatly increase its disposal cost.

[0156] Application Comparative Example 3

[0157] This comparative example provides a method for comprehensive thermal treatment of solid waste. The method is the same as Example 1 except that there is only one temperature zone in the hazardous waste gasification system, namely, the temperature in the gasification rotary kiln is 900°C.

[0158] In this comparative example, when the reduction temperature in the gasification rotary kiln is 900°C, it indicates that the burning amount of the material in the oxidation section increases and the ER increases. Under this working condition, the amount of flue gas generated by the combustion of the material increases and the calorific value of the generated combustible gas decreases.

[0159] From the above, it can be seen that the system device and method for comprehensive thermal treatment of solid waste provided by the present disclosure can treat hazardous waste and industrial solid waste separately and realize resource recycling, thereby improving economic benefits.

Claims

1. A system device for comprehensive thermal treatment of solid waste, the system device comprising a hazardous waste gasification system, an industrial solid waste incineration system and a flue gas treatment system; The hazardous waste gasification system comprises a feed preparation part and a gasification part connected in sequence; The gasification section comprises four zones, which are a drying zone, a devolatilization zone, an oxidation zone and a reduction zone in order from the feed point to the discharge point; the gasification section comprises a first gas outlet for gas discharge; The industrial solid waste incineration system includes a incineration device; The first gas outlet is connected to the sintering device; The flue gas outlet of the industrial solid waste incineration system is connected to the flue gas treatment system.

2. The system device according to claim 1, wherein: The feed mixing unit comprises a first conveying device, a crushing device, a mixing device and a second conveying device which are connected in sequence.

3. The system device according to claim 1 or 2, wherein: The feed mixing part is a closed space.

4. The system device according to any one of claims 1 to 3, wherein: The industrial solid waste incineration system also includes a solid waste feeding device arranged before the incineration device, and a cooling device and an ash recovery device arranged after the incineration device.

5. The system device according to claim 4, wherein: The solid waste feeding device comprises a metering part and a conveying part connected in sequence; Optionally, the conveying part includes a belt conveyor, a double-shaft mixer, a feeding belt conveyor and a receiving device which are connected in sequence.

6. The system device according to claim 5, wherein: An iron remover is arranged on the upper part of the belt conveyor.

7. The system device according to any one of claims 1 to 6, wherein: An auxiliary burner is arranged inside the sintering device.

8. The system device according to any one of claims 4 to 7, wherein: The cooling device comprises a cooling rotary kiln.

9. The system device according to any one of claims 1 to 8, wherein: The flue gas treatment system comprises a cooling device, a first dust removal device, a dry deacidification device, a second dust removal device, a wet deacidification device, a flue gas reheating device and a denitration device which are connected in sequence.

10. The system device according to claim 9, wherein: The cooling device includes an air cooling part and / or a water cooling part.

11. The system device according to claim 9 or 10, wherein: The dry desulfurization device comprises a slaked lime adding component, an activated carbon adding component and a neutralization reaction space; the slaked lime adding component and the activated carbon adding component are both connected to the neutralization reaction space.

12. The system device according to any one of claims 9 to 11, wherein: The second dust removal device includes a bag dust removal device.

13. A method for comprehensive thermal treatment of solid waste, the method being carried out using the system device for comprehensive thermal treatment of solid waste according to any one of claims 1 to 12.

14. The method according to claim 13, wherein: The method comprises: hazardous waste is compounded to obtain compounded materials; the compounded materials enter a gasification section and are sequentially dried, devolatilized, oxidized and reduced to obtain a first gas containing combustible gas; industrial solid waste enters a burning device and is burned under the action of the first gas, and the smoke after burning is discharged after smoke treatment.

15. The method according to claim 13 or 14, wherein: The calorific value of the mixed material ranges from 10000 to 16000 kJ / kg; Optionally, the mass fraction of the halogen element in the mixed material is ≤3%.

16. The method according to any one of claims 13 to 15, wherein: The particle size of the mixed material is 80 to 120 mm; Optionally, the bulk density of the mixed materials is 0.2-0.4 t / m 3 .

17. The method according to any one of claims 13 to 16, wherein: A gasifying agent is also introduced into the gasification section; the gasifying agent includes any one of air, oxygen, water vapor or water vapor-air; Optionally, the ER in the gasification section is 0.19-0.43, wherein the ER=actual oxygen supply / fuel amount / (theoretical oxygen demand / fuel amount); Optionally, the drying temperature in the gasification section is 200-300°C; Optionally, the temperature of the devolatilization component in the gasification section is 300-500°C; Optionally, the devolatilized components in the gasification section include decomposition of materials to produce decomposition gas and semi-coke; Optionally, the decomposition gas includes any one of tar, CO2, CO, CH4 or H2, or a combination of at least two thereof; Optionally, the oxidation in the gasification section includes reacting the semi-coke with oxygen to produce carbon oxides and water; Optionally, the carbon oxides include carbon monoxide and / or carbon dioxide; Optionally, the oxidation temperature in the gasification section is 500-800°C; Optionally, the reduction temperature in the gasification section is 800-1000°C; Optionally, the reduction in the gasification section includes: the oxidation product and water vapor undergo a reduction reaction with carbon to generate hydrogen and carbon monoxide.

18. The method according to any one of claims 13 to 17, wherein: The sintering temperature is 1100-1200°C.

19. The method according to any one of claims 13 to 18, wherein: The method further comprises: the materials produced by the sintering enter into a cooling rotary kiln, are cooled, and then enter into an ash recovery device for recovery.

20. The method according to any one of claims 13 to 19, wherein: The flue gas after burning is cooled to ≤200°C and then sequentially subjected to dust removal, desulfurization, heating, denitrification and discharge.

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