Domestic garbage furnace energy-saving combustion and waste heat recovery system containing biomass gasification synergy

Abstract

The invention discloses a household garbage furnace energy-saving combustion and waste heat recovery system containing biomass gasification synergy. The problems that in the prior art, mixed combustion of household garbage and kitchen garbage residues is insufficient, garbage leachate is difficult to treat, the biomass energy utilization rate is low, and waste heat is wasted are solved. The system comprises a household garbage furnace body, a vortex intensified combustion device, a waste heat absorption device, a biomass gasification collaboration device, a garbage leachate treatment device and a vacuum drying device. The vortex intensified combustion device is arranged in the furnace arch area, so that high-temperature flue gas forms vortexes to prolong the retention time and intensify combustion; the waste heat absorption device absorbs flue gas waste heat, and the vacuum drying device uses the waste heat to dry kitchen garbage residues; the biomass gasification synergy device generates and conveys biomass gas, the landfill leachate treatment device sprays leachate into the furnace, and the leachate and the biomass gas are subjected to opposed firing. According to the system, multi-class solid waste cooperative treatment and energy gradient utilization are achieved, the combustion efficiency and the environmental protection property are improved, and energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly waste incineration technology, and more specifically, to an energy-saving combustion and waste heat recovery system for municipal solid waste incinerators incorporating biomass gasification synergy. Background Technology

[0002] With the rapid development of the national economy and the improvement of residents' living standards, the amount of solid waste generated, such as household waste, kitchen waste residue, and agricultural and forestry waste, continues to increase. The waste treatment field faces multiple technical bottlenecks, including low combustion efficiency, difficulty in degrading pollutants, and insufficient energy utilization. Existing technologies are insufficient to meet the comprehensive treatment needs, and the specific shortcomings are as follows:

[0003] Firstly, the adaptability of kitchen waste residue for treatment is poor. Even after oil extraction, kitchen waste residue still contains a large amount of organic matter, but its moisture content is as high as 80%, and its calorific value is only 1000-2000 kJ / kg. When directly mixed with municipal solid waste for incineration, it is difficult to reach the minimum ignition temperature of the incinerator (usually ≥850℃), easily leading to incomplete combustion, large temperature fluctuations, or even flameout. It also produces unburned pollutants such as dioxin precursors. Current technologies do not have specific pretreatment or combustion-enhancing structures designed for its high moisture content and low calorific value characteristics, making safe and efficient co-combustion impossible.

[0004] Secondly, landfill leachate treatment is difficult and energy-intensive. As a high-concentration organic wastewater, landfill leachate contains high levels of COD, ammonia nitrogen, heavy metals, and polycyclic aromatic hydrocarbons, which are difficult to degrade. Existing treatment technologies either rely on complex evaporation and concentration systems, resulting in high energy consumption; or are only suitable for small-volume leachate recycling and cannot treat the high-concentration leachate generated during incineration; even when using the re-injection combustion method, the high water content of the leachate makes ignition difficult, further lowering the furnace temperature and exacerbating the problem of incomplete combustion of other wastes, and there is a lack of targeted combustion-supporting and temperature-protection designs.

[0005] Third, there is insufficient synergy between biomass energy and waste treatment. Agricultural and forestry waste has high volatile content and can be gasified to generate high-calorific-value biomass gas. However, current technologies only use it for independent combustion or as an auxiliary for single-fuel combustion. It has not been integrated with waste incineration, leachate treatment, and kitchen waste pretreatment systems. The high calorific value of biomass gas cannot solve the problem of insufficient temperature during mixed treatment, nor has it achieved the cascade utilization of biomass energy.

[0006] Fourth, the efficiency of waste heat recovery and utilization is low. The waste heat recovery of traditional waste incinerators is mostly limited to a single heat exchange mode of "flue gas-steam", which is only used for power generation or heating of a single stage. It does not link the waste heat with stages such as pretreatment of kitchen waste and biomass gasification, resulting in waste of waste heat resources and further increasing the overall energy consumption of the system.

[0007] In summary, existing technologies cannot simultaneously achieve the comprehensive goals of "efficient incineration of municipal solid waste, safe co-incineration of kitchen waste, complete degradation of leachate, efficient utilization of biomass energy, and cascade recovery of waste heat." There is an urgent need for an integrated and collaborative technological solution to break through the multiple technical bottlenecks in current solid waste treatment and achieve the goals of harmless, reduced, and resource-based treatment. Summary of the Invention

[0008] This invention provides an energy-saving combustion and waste heat recovery system for municipal solid waste incinerators with biomass gasification synergy, in order to solve the technical problems in traditional waste treatment technologies, such as incomplete combustion of municipal solid waste and kitchen waste residue, large furnace temperature fluctuations, difficulty and high energy consumption in leachate treatment, low utilization rate of biomass energy due to lack of integration with the waste treatment system, and resource waste due to the single utilization of waste incinerator waste heat.

[0009] To achieve the above objectives, the present invention provides an energy-saving combustion and waste heat recovery system for a municipal solid waste incinerator incorporating biomass gasification synergy, comprising an incinerator body, a vortex-enhanced combustion device, a waste heat absorption device, a biomass gasification synergy device, a leachate treatment device, and a vacuum drying device. The vortex-enhanced combustion device is located in the furnace arch area of ​​the municipal solid waste incinerator body, used to create a vortex flow in the high-temperature flue gas inside the furnace to prolong the flue gas residence time and enhance combustion. The waste heat absorption device is installed in the furnace arch area, used to absorb the waste heat from the high-temperature flue gas and output thermal energy. The vacuum drying device is connected to the waste heat absorption device, used to generate a vacuum environment using the thermal energy output by the waste heat absorption device to dry kitchen waste residue. The biomass gasification synergy device is used to generate biomass fuel gas and transport it into the municipal solid waste incinerator body. The leachate treatment device is used to transport the leachate into the municipal solid waste incinerator body, and cooperates with the biomass gasification synergy device to create a counter-current combustion between the leachate and the biomass fuel gas.

[0010] Furthermore, the vortex-enhanced combustion device includes a sealing structure for sealing the original outlet of the furnace arch area of ​​the municipal solid waste incinerator body, and an outlet structure opened on the sealing structure for forming a flue gas vortex. The outlet structure is a channel for the flue gas to form a vortex flow in the furnace arch area.

[0011] Furthermore, the cylindrical outlets are arranged in at least one row along the closed structure, and the bottom of the cylindrical outlets can extend into the body of the municipal solid waste incinerator to further extend the residence time of flue gas in the incinerator.

[0012] Furthermore, the vacuum drying device includes a steam generator connected to the waste heat absorption device for converting waste heat into high-pressure steam, and an ejector and a vacuum tank connected to the steam generator for generating a vacuum environment. The steam generator receives the heat energy output by the waste heat absorption device and converts it into high-pressure steam.

[0013] Furthermore, the vacuum tank is fitted with a jacket, which is used to allow hot water to circulate. When the hot water flows through the jacket, it heats the water-containing kitchen waste and sludge residue in the vacuum tank, helping the moisture to evaporate quickly.

[0014] Furthermore, the biomass gasification co-processing device includes a biomass gasifier, a gas delivery component and a gas combustion component for delivering the biomass gas generated by the biomass gasifier to the main body of the municipal solid waste incinerator, wherein the gas combustion component ignites the biomass gas within the main body of the municipal solid waste incinerator.

[0015] Furthermore, the landfill leachate treatment device includes a leachate conveying assembly for conveying landfill leachate, and a leachate injection assembly for injecting landfill leachate into the main body of the municipal solid waste incinerator. The leachate injection assembly is configured correspondingly to the gas combustion assembly, so that the injected landfill leachate and the burning biomass gas form a counter-current combustion.

[0016] Furthermore, the leachate conveying assembly includes a filter element for online filtration of landfill leachate and a conveying element for conveying the filtered landfill leachate, wherein the filter element pre-treats the landfill leachate to remove impurities.

[0017] Furthermore, the hot water flows through the jacket heat exchanger and then enters the mixer to replenish the water supply to the mixer.

[0018] Furthermore, the waste heat absorption device is a serpentine heat absorption pipeline structure, which is installed on the furnace arch area, and its output end is connected to the vacuum drying device to transport the absorbed heat energy.

[0019] The beneficial effects of this invention are:

[0020] The energy-saving combustion and waste heat recovery system for municipal solid waste incinerators with biomass gasification synergy provided by this invention achieves the co-treatment of multiple types of solid waste and efficient energy utilization by integrating vortex enhanced combustion, biomass gasification synergy, leachate counter-flushing combustion, and waste heat cascade utilization. Specifically, it is manifested as follows:

[0021] The vortex-enhanced combustion device in the furnace arch area causes the high-temperature flue gas to form a vortex flow, prolonging the flue gas residence time and increasing the temperature in the furnace arch area. This solves the problems of incomplete combustion and furnace temperature fluctuation caused by the high moisture content and low calorific value of kitchen waste residue, ensuring its high proportion of co-combustion.

[0022] The biomass gasification co-processing device generates biomass gas and landfill leachate through counter-combustion. The high calorific value of biomass gas assists in the ignition of leachate, thoroughly decomposing the recalcitrant pollutants in the leachate and avoiding the problems of high energy consumption or incomplete degradation in traditional leachate treatment.

[0023] The waste heat absorbed by the waste heat absorption device is converted into the drying of kitchen waste residue in a vacuum environment (negative pressure state) by the vacuum drying device. The low-pressure steam and evaporated water generated by vacuum drying can be used as biomass gasification agent, realizing the cascade utilization of waste heat and avoiding the resource waste caused by the traditional single utilization of waste heat.

[0024] The system integrates the treatment of household waste, kitchen waste residue, landfill leachate, and biomass energy, eliminating the need for separate treatment equipment, reducing equipment investment and operating costs, and lowering the carbon emissions and secondary pollution risks associated with the separate treatment of various solid wastes.

[0025] In summary, this system solves the problems of low combustion efficiency, difficult leachate treatment, low biomass utilization rate, and waste of residual heat in traditional waste treatment, realizing the harmlessness, reduction, and resource utilization of solid waste, and has significant environmental and economic value.

[0026] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0028] Figure 1 This is a schematic diagram of an energy-saving combustion and waste heat recovery system for a municipal solid waste incinerator containing biomass gasification synergy, according to an embodiment of the present invention.

[0029] Figure 2 This is a cross-sectional schematic diagram of the main body of the municipal solid waste incinerator;

[0030] Figure 3 This is a three-dimensional schematic diagram of the main body of the municipal solid waste incinerator.

[0031] Figure label:

[0032] 1. Municipal solid waste incinerator body; 11. First inlet; 12. Second inlet; 13. Third inlet; 14. Fourth inlet; 15. Flue; 16. Heat exchange device;

[0033] 2. Vortex-enhanced combustion device; 21. Enclosed structure; 22. Outlet structure;

[0034] Waste heat absorption device 3;

[0035] Vacuum drying device 4; steam generator 41; ejector 42; vacuum tank 43; mixer 45; first water pump 46; second water pump 47;

[0036] Biomass gasification co-processing unit 5; biomass gasifier 51; gas transmission assembly 52; gas combustion assembly 53; blower 54;

[0037] Landfill leachate treatment device 6; leachate conveying assembly 61; leachate spraying assembly 62; filter component 611; conveying component 612;

[0038] Jacket 7 Detailed Implementation

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0042] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0044] In the specification and claims of this invention, the terms "first" and "second" may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The following describes in detail, with reference to the accompanying drawings, an energy-saving combustion and waste heat recovery system for municipal solid waste incinerators incorporating biomass gasification synergy according to an embodiment of the present invention.

[0048] This invention provides an energy-saving combustion and waste heat recovery system for a municipal solid waste incinerator with biomass gasification synergy, comprising an incinerator body 1, a vortex-enhanced combustion device 2, a waste heat absorption device 3, a biomass gasification synergy device 5, a leachate treatment device 6, and a vacuum drying device 4. The vortex-enhanced combustion device 2 is located in the furnace arch area of ​​the municipal solid waste incinerator body 1, used to create a vortex flow of high-temperature flue gas in the furnace to prolong the flue gas residence time and enhance combustion. The waste heat absorption device 3 is installed in the high-temperature zone under the furnace arch, used to absorb the waste heat of high-temperature flue gas and output thermal energy. The vacuum drying device 4 is connected to the waste heat absorption device 3, used to generate a vacuum environment using the thermal energy output by the waste heat absorption device 3 to dry kitchen waste residue. The biomass gasification synergy device 5 is used to generate biomass fuel gas and transport it into the municipal solid waste incinerator body 1. The leachate treatment device 6 is used to transport leachate into the municipal solid waste incinerator body 1, and cooperates with the biomass gasification synergy device 5 to form a counter-current combustion between the leachate and the biomass fuel gas.

[0049] like Figure 1As shown, the energy-saving combustion and waste heat recovery system of the municipal solid waste incinerator with biomass gasification synergy in this embodiment takes the municipal solid waste incinerator body 1 as the core processing carrier. The municipal solid waste incinerator body 1 is provided with a first inlet 11 for feeding municipal solid waste, a second inlet 12 for injecting leachate, a third inlet 13 for connecting biomass gas, and a fourth inlet 14 for feeding dry kitchen waste sludge residue. The top of the furnace body is also provided with a flue 15, and a heat exchange device 16 is installed in the flue 15 to further exchange heat and recover energy from the discharged low-temperature flue gas.

[0050] The vortex-enhanced combustion device 2 is fixed in the arch area of ​​the main body 1 of the municipal solid waste incinerator. This area is the key area for flue gas flow and combustion reaction. Through the structural design of the vortex-enhanced combustion device 2, the high-temperature flue gas in the furnace can form a stable vortex flow in the arch area. Compared with the traditional direct exhaust outlet, the flue gas residence time can be extended by 30%-50%, ensuring that the unburned particles in the flue gas are fully burned. At the same time, the temperature of the arch area is increased to above 900°C, providing sufficient heat for the subsequent mixed combustion of municipal solid waste and kitchen waste residue.

[0051] The waste heat absorption device 3 is installed in close contact with the high-temperature flue gas zone at the bottom of the furnace arch area. It can efficiently absorb the waste heat in the flue gas and convert it into hot water at about 200°C for output. This not only avoids coking in the high-temperature flue gas zone, but also provides a stable heat source for the subsequent vacuum drying device 4.

[0052] The vacuum drying device 4 is connected to the output end of the waste heat absorption device 3 via a pipeline. The system also includes auxiliary conveying components for the vacuum drying device 4, namely a mixer 45, a first water pump 46, and a second water pump 47. The components work together to achieve a closed-loop process of "cold water preheating - waste heat absorption - hot water flash evaporation".

[0053] The first water pump 46 is a cold water pump, responsible for delivering room temperature cold water to the mixer 45. Simultaneously, when the steam generator 41 of the vacuum drying device 4 is running, it produces 160°C waste heat hot water (the portion that was not converted into high-pressure steam after flash evaporation). This 160°C hot water also flows into the mixer 45, where it mixes thoroughly with the room temperature cold water to form 120°C mixed hot water. This step recovers the waste heat from the steam generator 41, reducing the heating load on the subsequent waste heat absorption device 3.

[0054] The mixed 120°C hot water is transported to the waste heat absorption device 3 by the second water pump 47 (hot water pump). After absorbing the waste heat of the high-temperature flue gas in the furnace arch area, the hot water temperature rises to 200°C and is then transported back to the steam generator 41 of the vacuum drying device 4 through the pipeline. The 200°C hot water undergoes a flash evaporation process in the steam generator 41 and is converted into 160°C high-pressure steam. This high-pressure steam provides power to the ejector 42, so that a stable vacuum environment of -0.085 to -0.095 MPa is formed in the vacuum tank 43, thereby drying the kitchen waste residue with a moisture content of more than 80%. After drying, the moisture content of kitchen waste residue can be reduced to below 30%, and the calorific value can be increased to above 5000kJ / kg, meeting the ignition requirements for co-incineration with municipal solid waste. The dried kitchen waste sludge residue is fed into the municipal solid waste incinerator body 1 through the fourth inlet 14 to participate in combustion. The 160℃ hot water remaining after flash evaporation by the steam generator 41 continues to flow into the mixer 45 for recycling, forming a closed loop of "cold water - mixing preheating - heat absorption and temperature rise - flash evaporation - waste heat reuse" to avoid energy waste.

[0055] The output of the biomass gasification co-processing device 5 is connected to the third inlet 13 of the municipal solid waste incinerator body 1. This device can gasify agricultural and forestry waste (such as straw and branches) to generate biomass fuel gas (usually carbon monoxide and hydrogen, with a calorific value of about 5000-8000 kJ / m³), and stably deliver it into the furnace. The high calorific value of biomass fuel gas can quickly increase the local temperature inside the furnace, solving the problems of difficult ignition and large temperature fluctuations in traditional incinerators. This achieves deep synergy between biomass and waste incineration and leachate treatment, rather than relying on a single fuel.

[0056] The injection end of the landfill leachate treatment device 6 is set at the second inlet 12 of the municipal solid waste incinerator body 1. The system also includes a pretreatment and conveying assembly for the device, namely a filter component 611 and a conveying component 612: the filter component 611 is an online filter used to pretreat the collected landfill leachate (COD concentration of about 15,000-25,000 mg / L and ammonia nitrogen concentration of about 1,000-2,000 mg / L) to remove suspended particulate matter, fibers and other impurities, and to prevent clogging of subsequent components; the conveying component 612 is a screw pump, which is responsible for pressurizing and conveying the filtered leachate to the leachate injection assembly 62 to ensure that the leachate is injected into the furnace through the second inlet 12 at a stable pressure.

[0057] The direction of leachate injection is opposite to the direction of gas output of biomass gasification co-processing device 5, forming a counter-combustion angle of 120-150°. At a high temperature of about 1000°C, the recalcitrant organic matter (such as polycyclic aromatic hydrocarbons and heterocyclic compounds) in the leachate can be completely decomposed, with a COD removal rate of over 99% and an ammonia nitrogen removal rate of over 98%.

[0058] In addition, domestic waste is fed into the domestic waste incinerator body 1 through the first inlet 11, where it is co-combusted with dry kitchen waste sludge residue, biomass gas and injected leachate to achieve integrated treatment of multiple types of solid waste; the heat exchange device 16 in the flue 15 is a tubular heat exchanger, which can further exchange heat with the high-temperature flue gas (temperature of about 900-1100℃) after vortex enhanced combustion, converting the waste heat of the flue gas into hot water or low-pressure steam for use in the auxiliary processes of the plant, thereby further improving energy utilization.

[0059] In some embodiments of the present invention, the vortex-enhanced combustion device 2 includes a sealing structure 21 for sealing the original outlet of the furnace arch area of ​​the municipal solid waste incinerator body 1, and an outlet structure 22 opened on the sealing structure 21 for forming a flue gas vortex. The outlet structure 22 is a channel for the flue gas to form a vortex flow in the furnace arch area.

[0060] like Figure 2 As shown, the enclosed structure 21 of the vortex-enhanced combustion device 2 is made of high-temperature resistant concrete with a thickness of 100-150mm. Its dimensions perfectly match the original outlet of the furnace arch area of ​​the municipal solid waste incinerator body 1. It is integrally cast and connected to the furnace arch, completely sealing the original outlet and forcing the high-temperature flue gas to exit only through the outlet structure 22, thus overcoming the problem of short residence time caused by direct flue gas discharge in traditional methods. Several outlet structures 22 are evenly distributed in the central area of ​​the enclosed structure 21. The specific number of outlet structures 22 is selected according to the size and design requirements of the waste incinerator body 1. In this embodiment, three outlet structures 22 are provided, with the axis of each outlet structure 22 perpendicular to the enclosed structure 21. The outlet structure 22 causes the flue gas to exit in a vortex-like trajectory when passing through it (similar to the vortex shape of drainage pipes).

[0061] Furthermore, the axis of each outlet structure 22 forms an angle of 15-20° with the normal direction of the closed structure 21. This inclined design makes it easier for the high-temperature flue gas to form a clockwise vortex flow in the furnace arch area when it is ejected from the outlet structure 22. This can effectively carry away large particles of fly ash (particle size > 0.1mm) in the flue gas, prolong their residence time in the high-temperature zone, and increase the fly ash combustion rate from the traditional 85% to more than 95%. This reduces the waste of unburned calorific value and provides a continuous high-temperature environment for the full combustion of domestic waste and dry kitchen sludge residue.

[0062] In some embodiments of the present invention, the outlet structure 22 is a cylindrical outlet, which is arranged in at least one row along the closed structure 21, and the bottom of the cylindrical outlet can extend into the body 1 of the municipal solid waste incinerator to further extend the residence time of flue gas in the incinerator.

[0063] like Figure 3As shown, the outlet structure 22 is a cylindrical outlet with an inner diameter of 500-800mm and a length of 500-1600mm. The inner wall is lined with a high-temperature resistant ceramic lining with a thickness of 20-30mm, providing excellent high-temperature resistance and wear resistance. This prevents the high-temperature flue gas and fly ash from eroding and wearing the outlet structure 22, extending its service life. In this embodiment, the cylindrical outlets are arranged in a uniform row along the closed structure 21. The center-to-center distance between two adjacent cylindrical outlets is 1.2-1.5m, ensuring that the flue gas can form a continuous and stable vortex in the furnace arch area. This avoids interference between vortices due to excessively small outlet spacing, or insufficient vortex coverage due to excessively large spacing, thereby ensuring that domestic waste and dry kitchen sludge residue in different areas of the furnace can fully contact the high-temperature flue gas. Furthermore, the bottom of the cylindrical outlet extends 50-100mm into the main body 1 of the municipal solid waste incinerator, so that the lower end of the outlet structure 22 is 50-100mm lower than the top of the furnace arch area. This extension design can further prevent the rapid discharge of flue gas, extend the residence time of flue gas in the furnace by 10%-15%, and further improve the combustion efficiency.

[0064] In some embodiments of the present invention, the vacuum drying device 4 includes a steam generator 41 connected to the waste heat absorption device 3 for converting waste heat into high-pressure steam, and an ejector 42 and a vacuum tank 43 connected to the steam generator 41 for generating a vacuum environment. The steam generator 41 receives the heat energy output by the waste heat absorption device 3 and converts it into high-pressure steam.

[0065] like Figure 1As shown, the steam generator 41 of the vacuum drying device 4 is a flash tank with a volume of 5-8 m³, made of 304 stainless steel. The tank is equipped with baffles to extend the residence time of 200℃ hot water, ensuring sufficient heat exchange. The inlet of the steam generator 41 is connected to the hot water outlet of the waste heat absorption device 3 via a pipeline. After receiving 200℃ hot water, the pressure inside the tank is controlled at 0.6-0.8 MPa. Under this pressure, the hot water flashes to generate 160℃ high-pressure steam, with a steam output of 0.5-0.8 t / h, providing sufficient power for the ejector 42. The ejector 42 adopts a Venturi structure, and its inlet is connected to the steam outlet of the steam generator 41. High-pressure steam is ejected from the nozzle of the ejector 42 at a speed of 300-350 m / s, creating a negative pressure at the nozzle outlet. This negative pressure draws in and carries away the gas in the vacuum tank 43, maintaining the vacuum level in the vacuum tank 43 stably between -0.085 and -0.095 MPa. This vacuum level effectively lowers the boiling point of water in the kitchen waste residue and accelerates the evaporation rate. The vacuum tank 43 has a volume of 10-15 m³ and is equipped with multiple material trays inside. Water-containing kitchen waste sludge residue is conveyed to the trays via a conveyor belt. Under vacuum conditions, the boiling point of water in the kitchen waste residue drops to 40-50℃, shortening the drying time from 8-10 hours of traditional hot air drying to 3-4 hours, significantly improving drying efficiency. The dried kitchen waste sludge residue is then fed into the municipal solid waste incinerator body 1 through the fourth inlet 14 for combustion. Meanwhile, the 160°C hot water remaining after the flash steaming of the steam generator 41 flows into the mixer 45 through the pipeline, mixes with the room temperature cold water delivered by the first water pump 46 to form 120°C hot water, and is then delivered by the second water pump 47 to the waste heat absorption device 3 for recycling, realizing the cascade recovery of waste heat.

[0066] In some embodiments of the present invention, a jacket 7 is provided on the outside of the vacuum tank 43. The jacket 7 is used to allow hot water to flow through. When the hot water flows through the jacket 7, it heats the water-containing kitchen waste sludge residue in the vacuum tank 43, helping the water to evaporate quickly.

[0067] Furthermore, the hot water flows through the jacket 7 for heat exchange and then enters the mixer 45 to replenish the water supply to the mixer 45.

[0068] like Figure 1 As shown, when the kitchen waste residue is dried in the vacuum tank 43, low-pressure steam (temperature about 45-55℃, pressure about -0.085 to -0.095MPa) will be continuously generated. A certain amount of heat is required when the kitchen waste residue evaporates.

[0069] Specifically, the jacket 7 surrounding the vacuum tank 43 is the core component for generating heat for the vacuum tank's operation. Its structural design must balance heat transfer efficiency, sealing, and compatibility. It is entirely made of 304 stainless steel, a material with excellent high-temperature resistance and corrosion resistance. This allows it to withstand trace amounts of corrosive gases (such as organic acid vapors from food waste) that may be generated during the drying process in the vacuum tank 43, preventing rust and leakage after long-term use. Furthermore, the thermal conductivity of 304 stainless steel is approximately [missing information]. This design ensures efficient heat exchange between the hot water in the jacket and the outer wall of the vacuum tank. The input end of the jacket 7 can be connected to the output end of the waste heat absorption device 3, introducing 200℃ hot water heated by the furnace arch area of ​​the waste incinerator body 1 into the jacket 7. The jacket 7 has a cylindrical structure that matches the vacuum tank 43, with its inner diameter being 10-15mm larger than the outer diameter of the vacuum tank 43, forming an annular water flow channel with a width of 5-7.5mm. The width of this channel has been optimized through fluid dynamics simulation to ensure that the 200℃ hot water flows uniformly within the channel without local stagnation, while avoiding the problems of excessively wide channels leading to slow water flow and insufficient heat exchange, or excessively narrow channels leading to excessive water flow resistance and the need for additional delivery pump power. The axial length of the jacket 7 is consistent with the effective drying section length of the vacuum tank 43 (i.e., covering the entire area of ​​the material tray inside the vacuum tank), ensuring that the heat in the 200℃ hot water can be fully recovered by the vacuum tank 43, with no dead zones where heat is wasted. The jacket 7 is sealed at both ends with flanges made of the same material as the jacket body. A nitrile rubber sealing ring with a temperature resistance of over 200℃ is installed inside the flange. The jacket 7 is securely connected to the outer wall of the vacuum tank 43 with bolts, preventing hot water leakage between the jacket 7 and the vacuum tank 43. The water inlet of the jacket 7 is located on its bottom side, and the water outlet is located on its top side, forming a "bottom in, top out" water flow direction. This design conforms to the principle of rising heat flow. After entering from the bottom, the 200℃ hot water gradually flows upward along the annular channel, allowing the heat to fully contact the outer wall of the vacuum tank 43 from bottom to top, gradually increasing the temperature. This causes the water-containing kitchen waste sludge inside the vacuum tank 43 to evaporate rapidly after being heated. The hot water in the jacket 7, after heat exchange, finally flows out from the top at a stable temperature of around 140℃.

[0070] The core function of jacket 7 is to heat the water-containing kitchen sludge in vacuum tank 43 through the flow of hot water. 200℃ hot water is drawn from a serpentine pipe in the area below the furnace arch, transported through a pipeline to the bottom inlet of jacket 7, and enters the annular channel between the jacket and vacuum tank 43. The hot water flows spirally upward along the annular channel (the inner wall of the channel is welded with spiral guide ribs, 2mm high, with a pitch of 150mm, which guides the water flow into a spiral trajectory, preventing the water from flowing rapidly in a straight line and causing insufficient heat exchange). Finally, the hot water, after releasing heat, flows out from the outlet at the top of jacket 7 and enters the subsequent mixer 45. The heat released by the hot water is transferred to the water-containing kitchen sludge in vacuum tank 43 through heat conduction via the stainless steel outer wall of vacuum tank 43, allowing the temperature of the hot water to gradually decrease from 200℃ to about 140℃ during the flow process in jacket 7.

[0071] In some embodiments of the present invention, the biomass gasification co-processing device 5 includes a biomass gasifier 51, a gas delivery assembly 52 and a gas combustion assembly 53 for delivering the biomass gas generated by the biomass gasifier 51 to the municipal solid waste incinerator body 1, wherein the gas combustion assembly 53 ignites the biomass gas within the municipal solid waste incinerator body 1.

[0072] like Figure 1As shown, the biomass gasifier 51 of the biomass gasification co-processing device 5 is made of high-temperature refractory bricks. An insulation layer is provided on the outside of the furnace body to reduce heat loss and ensure a stable gasification temperature of 700-800℃. This temperature range effectively promotes the gasification reaction of agricultural and forestry waste, increasing the yield and calorific value of biomass gas. The top of the biomass gasifier 51 has a biomass feed inlet. Agricultural and forestry waste (such as straw, branches, etc.) is crushed (particle size <50mm) and fed into the furnace through the feed inlet. The bottom has a gasifying agent inlet and an ash outlet. The gasifying agent is fed in from the bottom and reacts with the biomass in the furnace. The generated biomass gas is discharged from the gas outlet in the middle of the furnace body. The gas yield can reach 200-300 m³ / h, with a methane volume fraction of approximately 25%-30% and a hydrogen gas volume fraction of approximately 15%-20%, exhibiting a high calorific value. The gas transmission assembly 52 includes a gas transmission pipeline, a desulfurization tower, and a Roots blower. The gas transmission pipeline is made of carbon steel and wrapped with insulation cotton to prevent condensation from occurring due to temperature drop during transmission. The desulfurization tower is filled with iron oxide desulfurizing agent, which can reduce the hydrogen sulfide content in biomass gas from 500-800 mg / m³ to below 50 mg / m³, preventing hydrogen sulfide from corroding equipment or generating sulfur dioxide to pollute the environment during combustion. The Roots blower has a pressure of 15-20 kPa, which can pressurize and transport the desulfurized biomass gas to the gas combustion assembly 53. The gas combustion assembly 53 is a swirl burner, installed at the third inlet 13 of the municipal solid waste incinerator body 1. The burner nozzle adopts a scaling structure, which allows for thorough mixing of biomass gas and air, with a mixing ratio controlled at 1:5-1:6. During ignition, the biomass gas is ignited by a high-energy igniter. The combustion flame length can reach 1.5-2m, and the flame temperature can reach 1000℃, which can rapidly increase the temperature of the front arch zone inside the furnace, providing a guarantee for the ignition of municipal solid waste and dry kitchen sludge residue. At the same time, the biomass gasification co-processing device 5 also includes a blower 54. The outlet of the blower 54 is connected to the gasification agent inlet of the biomass gasifier 51, and the air supply can be adjusted according to the pressure changes inside the biomass gasifier 51 to ensure stable gasification reaction.

[0073] In some embodiments of the present invention, the landfill leachate treatment device 6 includes a leachate conveying assembly 61 for conveying landfill leachate, and a leachate injection assembly 62 for injecting landfill leachate into the municipal solid waste incinerator body 1. The leachate injection assembly 62 is correspondingly arranged with the gas combustion assembly 53, so that the injected landfill leachate and the burning biomass gas form a counter-combustion reaction.

[0074] like Figure 1As shown, the leachate conveying assembly 61 of the landfill leachate treatment device 6 includes a leachate storage tank with a volume of 10-15 m³, used to store landfill leachate collected from landfills or incinerators. The tank is equipped with a stirring device to prevent impurities in the leachate from settling and to ensure uniform leachate composition. The leachate conveying assembly 61 can stably convey the leachate to the leachate injection assembly 62. The leachate injection assembly 62 is a dual-fluid nozzle installed at the second inlet 12 of the municipal solid waste incinerator body 1, while the nozzle of the gas combustion assembly 53 is correspondingly installed at the third inlet 13 of the municipal solid waste incinerator body 1. The two inlets are symmetrically distributed along the same side wall of the municipal solid waste incinerator body 1, and the dual-fluid nozzle at the second inlet 12 and the gas nozzle at the third inlet 13 are arranged in a relatively opposite manner, with their axes intersecting within the furnace. This relative structural design ensures that the injection direction of the leachate injection assembly 62 is precisely aligned with the flame direction of the gas combustion assembly 53, forming a counter-impact angle of 120-150°. Figure 3 As shown, the angle between the installation positions of the nozzles on both sides and the side wall of the furnace body ensures that the atomized leachate and the biomass gas flame are in full contact in the core combustion zone of the furnace.

[0075] The leachate injection assembly 62's dual-fluid nozzle consists of a compressed air inlet, a leachate inlet, and an injection port. The compressed air inlet is connected to the plant's compressed air network via a pipeline (compressed air pressure is 0.6-0.8 MPa), and the leachate inlet is connected to the output end of the leachate delivery assembly 61. The nozzle of the gas combustion assembly 53 adopts a scaling structure, allowing for a stable spray after thorough mixing of biomass gas and air. When the leachate is sprayed from the dual-fluid nozzle at the second inlet 12, it is atomized into fine droplets with a particle size of 50-100 μm under the action of compressed air. Simultaneously, the gas nozzle at the third inlet 13 sprays and ignites the biomass gas, forming a high-temperature flame of approximately 1000°C. The two nozzles, positioned opposite each other, allow the atomized leachate to directly collide with the high-temperature flame, significantly increasing the contact area and reaction time. Under high temperature, the organic matter in the leachate undergoes rapid oxidative decomposition, with recalcitrant polycyclic aromatic hydrocarbons and heterocyclic compounds completely decomposed. , Harmless substances such as COD can be removed at a rate of over 99%, and ammonia nitrogen is converted into... and The removal rate reaches over 98%, avoiding the problems of difficult treatment of concentrated liquid and secondary pollution in traditional leachate treatment processes. At the same time, the relative arrangement of the two nozzles also reduces airflow interference in the furnace, ensuring stable counter-current combustion and further improving the pollutant degradation efficiency.

[0076] In some embodiments of the present invention, the leachate conveying assembly 61 includes a filter element 611 for online filtration of landfill leachate and a conveying element 612 for conveying the filtered landfill leachate. The filter element 611 pre-treats the landfill leachate to remove impurities.

[0077] like Figure 1 As shown, the filtration component 611 of the leachate conveying assembly 61 is an online filter with a stainless steel shell and a replaceable filter element inside. The filter element is made of polypropylene and has a filtration accuracy of 50-100μm. It can effectively intercept suspended particles and fibrous impurities in landfill leachate, preventing these impurities from entering the subsequent conveying component 612 and leachate injection assembly 62, avoiding pump wear or nozzle clogging, and ensuring the stability of leachate conveying and injection. Pressure sensors are installed at both the inlet and outlet of the online filter. When the filter element becomes clogged and the pressure difference between the inlet and outlet exceeds 0.1MPa, the system will automatically issue an alarm signal to remind the operator to replace the filter element, ensuring stable filtration and preventing a decrease in leachate flow due to filter element clogging, which would affect the flushing combustion effect. In addition, the online filter is also equipped with a backwashing interface, which allows for periodic backwashing of the filter element with high-pressure water to wash away impurities adhering to the filter element surface, extending the filter element's service life and reducing operating costs. The conveying component 612 is a screw pump. The stator of the screw pump is made of wear-resistant rubber, and the rotor is made of stainless steel, providing excellent corrosion and wear resistance. This allows it to withstand the highly corrosive environment of landfill leachate (pH 3-10), extending its service life and reducing equipment replacement frequency. The screw pump's outlet pipeline is equipped with a flow regulating valve, which adjusts the leachate injection flow rate according to the combustion load of the municipal solid waste incinerator 1. When the incinerator load is high (processing capacity > 20 t / h), the leachate flow rate is increased to 8-10 m³ / h; when the incinerator load is low (processing capacity < 10 t / h), the leachate flow rate is reduced to 5-6 m³ / h. This ensures that the leachate flow rate matches the combustion conditions within the incinerator, preventing a drop in furnace temperature due to excessive leachate or incomplete pollutant treatment due to insufficient leachate. Simultaneously, a check valve is installed at the screw pump outlet to prevent backflow of leachate when the pump stops, protecting the pump body from damage.

[0078] In some embodiments of the present invention, the waste heat absorption device 3 is a serpentine heat absorption pipeline structure, which is installed on the high-temperature flue gas flow path in the furnace arch area, and its output end is connected to the vacuum drying device 4 to transport the absorbed heat energy.

[0079] like Figure 2As shown, the serpentine heat absorption pipe structure of the waste heat absorption device 3 is made of high-temperature resistant seamless steel pipe with an outer diameter of 50-60mm and a wall thickness of 5-6mm. It can withstand the high temperature of 900-1100℃ in the furnace arch area and the scouring of flue gas, preventing pipe leakage due to high-temperature deformation or corrosion and ensuring stable system operation. The total length of the serpentine pipe is set according to the size of the furnace arch area of ​​the municipal solid waste incinerator body 1. In this embodiment, the total length is 30-40m, and the spacing between the pipes is 150-200mm. They are evenly arranged on the furnace wall surface along the high-temperature flue gas flow path at the bottom of the furnace arch area, ensuring that the pipes can contact the high-temperature flue gas with the maximum area, improving heat exchange efficiency. Compared with the traditional straight-tube heat absorption structure, the heat exchange area increases by more than 30%, enabling more complete recovery of waste heat from the flue gas. The inlet of the serpentine heat-absorbing pipeline structure is connected to the second water pump 47 via a pipeline, receiving mixed hot water at 120℃. As the hot water flows within the pipeline, it absorbs heat from the high-temperature flue gas, gradually heating up to approximately 200℃. This high-temperature hot water then flows out from the outlet of the pipeline and is transported through another pipeline to the steam generator 41 of the vacuum drying device 4, providing a heat source for steam generation. The bending radius of the serpentine pipeline is 150-200mm, manufactured using a cold-bending process to prevent cracks or deformation at the bends, ensuring the pipeline's sealing and structural strength. Furthermore, the outer side of the serpentine heat-absorbing pipeline structure is equipped with wear-resistant protective tiles made of wear-resistant cast iron, 8-10mm thick, covering the windward side of the pipeline. This reduces the scouring and wear caused by fly ash in the high-temperature flue gas, extending the pipeline's service life and reducing equipment replacement costs. Because the serpentine heat absorption pipe structure can effectively absorb the heat in the furnace arch area, the temperature in the furnace arch area can be reduced by 50-80℃, avoiding coking caused by excessively high temperature in the furnace arch area (coking temperature is usually above 1100℃), reducing the number of coking cleaning times, and reducing operation and maintenance costs.

[0080] The energy-saving combustion and waste heat recovery system for municipal solid waste incinerators incorporating biomass gasification, as described in this invention, achieves harmless treatment of various types of solid waste, cascade utilization of energy, and low-consumption operation of the system through the deep synergy of the structural design and operation process of each functional module. Specific beneficial effects are as follows:

[0081] The system, centered on the municipal solid waste incinerator body 1, integrates a vortex-enhanced combustion device 2, a waste heat absorption device 3, a vacuum drying device 4, a biomass gasification co-processing device 5, and a landfill leachate treatment device 6, constructing an integrated system of "solid waste treatment - energy recovery - recycling". The vortex-enhanced combustion device 2, through the design of a closed structure 21 and a cylindrical outlet structure 22, creates a stable vortex flow of high-temperature flue gas inside the furnace, extending the flue gas residence time by 30%-50%, raising the temperature in the furnace arch zone to over 900℃. This solves the problems of incomplete combustion and furnace temperature fluctuations caused by the low calorific value and high moisture content of kitchen waste residue (80% moisture content, 1000-2000 kJ / kg), achieving a high proportion of co-combustion of over 20% of kitchen waste residue, while simultaneously enhancing the fly ash burnout rate (from 85% to over 95%), reducing the emission of unburned pollutants.

[0082] The vacuum drying device 4, together with the waste heat absorption device 3, mixer 45, first water pump 46, second water pump 47, and jacket 7, forms a more efficient closed-loop water circulation: the ambient temperature cold water delivered by the first water pump 46 and the 160℃ waste heat hot water discharged by the steam generator 41 exchange heat with the vacuum tank 43 heated by the jacket 7 to generate 140℃ hot water, which is then fully mixed in the mixer 45 to form stable 120℃ hot water. This hot water is then delivered by the second water pump 47 to the waste heat absorption device 3 (serpentine heat absorption pipeline) to absorb the waste heat of the flue gas and raise its temperature to 200℃. It then enters the steam generator 41 to flash evaporate into 160℃ high-pressure steam, which provides power to the ejector 42 to form a vacuum environment (negative pressure) of -0.085 to -0.095MPa in the vacuum tank 43, reducing the moisture content of kitchen waste residue from 80% to below 30% and increasing its calorific value to above 3000kJ / kg. The jacket 7, through its "bottom-in, top-out" water flow design and spiral guide structure, efficiently heats the water-containing kitchen waste sludge in the vacuum tank 43, improving the working efficiency of the vacuum tank 43. At the same time, it provides a stable supplementary heat source for the mixer 45, avoiding the impact of fluctuations in a single water source on system operation. Combined with the heat recovery design, the drying energy consumption is reduced by 70% compared to traditional hot air drying, realizing the cascade recovery and recycling of waste heat, further improving the energy efficiency and stability of kitchen waste pretreatment.

[0083] The biomass gasification co-processing unit 5 and the landfill leachate treatment unit 6 form a counter-current combustion mechanism: the biomass gasifier 51 uses agricultural and forestry waste as raw material to generate biomass fuel gas with a calorific value of 5000-8000 kJ / m³ at 700-800℃. After desulfurization (hydrogen sulfide reduced to below 50 mg / m³) by the fuel gas conveying component 52, it is ignited by the fuel gas combustion component 53 at the third inlet 13 of the municipal solid waste incinerator body 1, forming a high-temperature flame of 1200-1300℃. The landfill leachate is pretreated by the filter component 611 and pressurized by the conveying component 612, and then injected into the inlet 12 by the leachate injection component 62, forming a 120-150° counter-current combustion with the biomass fuel gas, achieving a COD removal rate of 99% for the leachate. The ammonia nitrogen removal rate reaches over 98%, and no concentrate is required. This solves the problems of complex evaporation systems and secondary pollution that are common in existing leachate treatment technologies. At the same time, the high calorific value of biomass gas assists in the ignition of leachate, avoids a drop in furnace temperature, and ensures combustion stability.

[0084] Furthermore, the serpentine heat absorption pipe structure of the waste heat absorption device 3 not only efficiently recovers waste heat from the flue gas but also reduces the temperature in the furnace arch area by 50-80℃, preventing coking in the furnace arch and extending the coking cycle. The heat exchange device 16 in the flue duct 15 further exchanges heat with the flue gas at 900-1100℃, and the converted steam can be used in auxiliary production processes within the plant, minimizing heat loss. Each module of the system does not require separate processing equipment, reducing equipment investment and operating costs, while also reducing carbon emissions and secondary pollution risks associated with separate treatment of various solid wastes.

[0085] In summary, the system and its modules of this invention work together to solve the problems of difficult co-incineration of kitchen waste residue, incomplete degradation of leachate, low biomass utilization rate, and waste of residual heat in traditional waste treatment. It achieves the coordinated harmless treatment and efficient energy recycling of domestic waste, kitchen waste residue, and landfill leachate, taking into account both environmental protection and economy, and has significant practical value.

[0086] Of course, for those skilled in the art, other structures and working principles of the energy-saving combustion and waste heat recovery system of the municipal solid waste incinerator with biomass gasification synergy are understandable and achievable, and will not be described in detail in this invention.

[0087] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A waste-to-energy combustion and waste heat recovery system for municipal solid waste incinerators incorporating biomass gasification, characterized in that, The system includes a municipal solid waste incinerator body (1), a vortex-enhanced combustion device (2), a waste heat absorption device (3), a biomass gasification co-processing device (5), a landfill leachate treatment device (6), and a vacuum drying device (4). The vortex-enhanced combustion device (2) is located in the furnace arch area of ​​the municipal solid waste incinerator body (1) and is used to create a vortex flow of high-temperature flue gas in the furnace to prolong the flue gas residence time and enhance combustion. The waste heat absorption device (3) is installed in the furnace arch area and is used to absorb the waste heat of high-temperature flue gas and output thermal energy. The vacuum drying device (4) is located in the furnace arch area. The device (4) is connected to the waste heat absorption device (3) and is used to generate a vacuum environment by using the heat energy output by the waste heat absorption device (3) to dry the kitchen waste residue; the biomass gasification co-processing device (5) is used to generate biomass gas and transport it to the domestic waste incinerator body (1); the landfill leachate treatment device (6) is used to transport landfill leachate to the domestic waste incinerator body (1) and cooperate with the biomass gasification co-processing device (5) to make the landfill leachate and biomass gas form a counter-combustion.

2. The system according to claim 1, characterized in that, The vortex-enhanced combustion device (2) includes a sealing structure (21) for sealing the original outlet of the furnace arch area of ​​the municipal solid waste incinerator body (1), and an outlet structure (22) opened on the sealing structure (21) for forming a flue gas vortex. The outlet structure (22) is a channel for the flue gas to form a vortex flow in the furnace arch area.

3. The system according to claim 2, characterized in that, The outlet structure (22) is a cylindrical outlet, which is arranged in at least one row along the closed structure (21), and the bottom of the cylindrical outlet can extend into the body of the municipal solid waste incinerator (1) to further extend the residence time of flue gas in the incinerator.

4. The system according to claim 1, characterized in that, The vacuum drying device (4) includes a steam generator (41) connected to the waste heat absorption device (3) for converting waste heat into high-pressure steam, and an ejector (42) and a vacuum tank (43) connected to the steam generator (41) for generating a vacuum environment. The steam generator (41) receives the heat energy output by the waste heat absorption device (3) and converts it into high-pressure steam.

5. The system according to claim 4, characterized in that, The vacuum tank (43) is fitted with a jacket (7) which is used to supply hot water. When the hot water flows through the jacket (7), it heats the water-containing kitchen waste sludge residue in the vacuum tank (43) and helps the water evaporate quickly.

6. The system according to claim 1, characterized in that, The biomass gasification co-processing device (5) includes a biomass gasifier (51), a gas delivery component (52) and a gas combustion component (53) for delivering the biomass gas generated by the biomass gasifier (51) to the municipal solid waste incinerator body (1), wherein the gas combustion component (53) ignites the biomass gas in the municipal solid waste incinerator body (1).

7. The system according to claim 6, characterized in that, The landfill leachate treatment device (6) includes a leachate conveying assembly (61) for conveying landfill leachate, and a leachate injection assembly (62) for injecting landfill leachate into the municipal solid waste incinerator body (1). The leachate injection assembly (62) is correspondingly arranged with the gas combustion assembly (53) so that the injected landfill leachate and the burning biomass gas form a counter-burning reaction.

8. The system according to claim 7, characterized in that, The leachate delivery assembly (61) includes a filter element (611) for online filtration of landfill leachate and a delivery element (612) for delivering the filtered landfill leachate. The filter element (611) pre-treats the landfill leachate to remove impurities.

9. The system according to claim 5, characterized in that, Hot water flows through the jacket (7) for heat exchange and then enters the mixer (45) to replenish the water source for the mixer (45).

10. The system according to claim 1, characterized in that, The waste heat absorption device (3) is a serpentine heat absorption pipeline structure. The serpentine heat absorption pipeline structure is installed on the high-temperature flue gas flow path in the furnace arch area, and its output end is connected to the vacuum drying device (4) to transport the absorbed heat energy.

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