Environment-friendly emission system for kitchen waste incinerator

Abstract

Disclosed in the present invention is an environment-friendly emission system for a kitchen waste incinerator, comprising a waste incinerator, a dry desulfurization tower, a dust collector and a chimney, wherein a flue gas discharge pipe of the waste incinerator is connected to the dry desulfurization tower, an outlet of the dry desulfurization tower is connected to an inlet of the dust collector, and an outlet of the dust collector is connected to the chimney; a high-temperature heat exchanger and a low-temperature heat exchanger are sequentially arranged on a flue gas duct between the waste incinerator and the dry desulfurization tower; a branch recirculation pipe is provided on the duct between the high-temperature heat exchanger and the low-temperature heat exchanger and is connected to an inlet of a recirculation fan; and an outlet of the recirculation fan is separately connected to air chambers arranged on the waste incinerator. The present invention has the following beneficial effects: the generation of nitrogen oxides is low, the energy consumption is reduced, and the costs of solid waste treatment are saved.

Description

An environmentally friendly emission system for kitchen waste incinerators Technical Field

[0001] This invention belongs to the field of kitchen waste incineration technology, specifically an environmentally friendly emission system for a kitchen waste incinerator. Background Technology

[0002] With the rapid growth of the national economy and the acceleration of urbanization, the amount of urban solid waste generated has increased dramatically. According to data from the National Bureau of Statistics of China, since 2008, the amount of urban domestic waste disposed of and transported has increased year by year. By 2018, the total amount of urban waste in China reached 228 million tons, an increase of 5.59% year-on-year. Waste treatment has become a key issue in urban development. The composition of urban solid waste is affected by seasonality and regionality, and fluctuates greatly, but its overall composition is relatively stable, mainly consisting of rubber, paper, plastics, food waste, and biomass waste. It has a low average moisture content and high calorific value. Therefore, incineration has been widely used to treat urban solid waste.

[0003] The amount of kitchen waste in municipal solid waste is increasing year by year. Because kitchen waste has a much higher water content than general municipal solid waste, it has a low calorific value and is difficult to ignite. Ordinary municipal solid waste incinerators are no longer suitable for it, and there is an urgent need to develop an energy-saving kitchen waste incinerator that can achieve environmentally friendly emissions.

[0004] In the prior art, to solve the above-mentioned technical problems, Chinese invention patent application No. 202311575910.8 discloses an energy-saving combustion system for a waste incinerator, which includes a waste incinerator, a sludge heating device, a leachate tank, a water tank, and a heat exchanger. The sludge heating device is connected to the feed hopper of the waste incinerator via a conveyor belt, feeding heated sludge into the incinerator for combustion. Pipes are installed on the upper side wall of the furnace of the waste incinerator. The pipes include a first pipe and a second pipe. The water tank is connected to the inlet of the first pipe via a first water pump, and the outlet of the first pipe is connected to the water tank, forming a first heating water circulation. The water tank is connected to the inlet of the second pipe via a second water pump, and the outlet of the second pipe is connected to the sludge heating device. The sludge heating device is connected to the water tank, forming a second heating water circulation. The aforementioned pipes are installed on the inner wall of the upper part of the furnace to absorb localized high temperatures inside the furnace, preventing coking on the furnace wall caused by localized high temperatures and effectively extending the service life of the waste incinerator. Simultaneously, the heat absorbed by the pipes is used to heat sludge heating devices, etc. While the above technical solution effectively reduces the energy consumption for sludge drying; ensures stable combustion of low-calorific-value municipal solid waste, sludge, and leachate without increasing the use of high-calorific-value auxiliary fuel; and produces flue gas with extremely low dust and nitrogen oxide content, allowing for direct emission and significant environmental benefits, the nitrogen oxide emissions are a serious pollution problem. This demonstrates that reducing nitrogen oxide emissions is an urgent technical issue that needs to be addressed, and there are currently no relevant literature reports on this technology. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the existing technology described above by providing an environmentally friendly emission system for a kitchen waste incinerator, specifically designed for kitchen waste treatment, which can save on solid waste treatment costs and reduce nitrogen oxide generation and energy consumption.

[0006] The technical solution adopted in this invention is: an environmentally friendly emission system for a kitchen waste incinerator, comprising an incinerator, a dry desulfurization tower, a dust collector, and a chimney. The flue gas emission pipe of the incinerator is connected to the dry desulfurization tower, the outlet of the dry desulfurization tower is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the chimney. A high-temperature heat exchanger and a low-temperature heat exchanger are sequentially installed on the flue gas pipe between the incinerator and the dry desulfurization tower. A branch recirculation pipe is installed on the pipe between the high-temperature heat exchanger and the low-temperature heat exchanger and connected to the inlet of the recirculation fan. The outlet of the recirculation fan is connected to each air chamber installed on the incinerator.

[0007] The waste incinerator has several air chambers arranged in the lower part of the furnace. Each air chamber is equipped with a recirculated flue gas inlet, a primary air inlet, a primary baffle, and a secondary baffle. The primary baffle is located in the middle of the air chamber cavity and above the recirculated flue gas inlet. The primary air inlet is located on the bottom wall of the air chamber between the primary baffle and the secondary baffle.

[0008] A channel is formed between the primary baffle and the inner wall of the air chamber.

[0009] The edge of the primary baffle has a downward-bent section, which folds back and mixes the incoming circulating flue gas before it overflows from the channel, causing the circulating flue gas to form a fragmented flow after impacting the primary baffle. The primary baffle is installed at 1 / 2 height of the air chamber, with a width that is 1 / 2 the width of the air chamber at the same height, a downward tilt angle of 30-60 degrees, and a height from the bottom that is 1 / 4 of the total height of the air chamber.

[0010] The secondary baffle is installed on the side wall of the air chamber above the primary baffle, and a mixed gas channel is formed in the middle of the secondary baffle, which communicates with the furnace. The secondary baffle is installed at 3 / 4 of the height of the air chamber and is divided into two parts, left and right, each with a width of 1 / 4 of the width of the air chamber at the same height.

[0011] The dry desulfurization tower includes a tower body and several tangential nozzles disposed on the side of the tower body. The tangential nozzles are connected to an ejector. The high-pressure inlet of the ejector is connected to the outlet of an air compressor. The ejector inlet is connected to a powder silo through a pipe. The powder silo contains baking soda powder. The height of the tangential nozzles from the bottom of the desulfurization tower is 60-80% of the total height. There are 6-12 tangential nozzles with an inclination angle of 30-60 degrees.

[0012] It also includes a waste pretreatment module, which is connected to the waste incinerator via a screw conveyor. The waste pretreatment module includes a waste sorting unit, a drying unit, and an organic treatment unit. The waste sorting unit is connected to the drying unit and includes a waste storage bin and a sorting device. The waste storage bin is connected to the sorting device. The sorting device is connected to the treatment unit. The treatment unit is equipped with an oil delivery pipe connected to an external transport module and a liquid delivery pipe connected to a wastewater treatment tank.

[0013] The organic waste residue outlet of the treatment unit is connected to the organic treatment unit through an organic waste residue conveying pipe; the organic treatment unit includes an anaerobic digester, the organic waste residue conveying pipe is connected to the material inlet of the anaerobic digester, and the biogas outlet of the anaerobic digester is connected to a combustion mixing device through a conveying pipe.

[0014] The chimney is provided with a branch pipe that is connected to the air chamber of the drying unit through a second fan; the exhaust port of the drying chamber is connected to the furnace of the waste incinerator through a third fan; the combustion mixing device includes a combustion mixing chamber and a burner disposed on the inner side wall of the combustion mixing chamber, and the biogas outlet of the anaerobic digester is connected to the fuel inlet of the burner through a delivery pipe.

[0015] It also includes a hot air generating device, which comprises a solar thermal storage circulation mechanism and a ceramic electric radiation thermal accumulator. The solar thermal storage circulation mechanism comprises a solar photovoltaic power generation module and a thermal storage circulation module. The thermal storage circulation module comprises an electric heater, a high-temperature molten salt tank, a heat exchanger, and a low-temperature molten salt tank. The electric heater is connected to the high-temperature molten salt tank, which is connected to the heat exchanger via a first molten salt pump. The heat exchanger is connected to the low-temperature molten salt tank, which is connected to the electric heater via a second molten salt pump, forming a thermal storage circulation pipeline. The solar photovoltaic power generation module is connected to the electric heater. The ceramic electric radiation thermal accumulator is connected to the power grid. The air inlet pipe is connected to the heat exchanger via a fourth fan. The hot air outlet of the heat exchanger is connected to the air inlet of the ceramic electric radiation thermal accumulator. The outlet of the ceramic electric radiation thermal accumulator is connected to a mixer. The mixer is connected to a wind chamber and a first fan.

[0016] The ceramic radiant heat storage device includes a housing, ceramic heat storage elements, and an electric heater. Several ceramic heat storage elements are installed inside the housing, with gaps between adjacent elements forming air heating channels. The electric heater is installed inside the ceramic heat storage elements, storing the heat released by the electric heater within the ceramic heat storage elements. Preferably, two partitions are provided inside the housing, and the ceramic heat storage elements are fixed between the two partitions. An air inlet and an air outlet are formed between the two partitions and the upper and lower walls of the housing, respectively. An air inlet port is installed on the air inlet port, and an air outlet port is provided on the air outlet port. Air passages are provided between the air inlet and air outlet ports and the air heating channels.

[0017] In summary, compared with existing technologies, the present invention has the following beneficial effects: 10% of the total high-temperature flue gas is extracted from the flue and mixed with the primary air in the wind box, resulting in high temperature, low oxygen content, strong combustion, and low nitrogen oxide generation; the high-temperature flue gas can increase the temperature of the primary air, reduce the amount of primary air heating steam used, and reduce energy consumption; primary and secondary baffles are installed in the wind chamber, and the recirculated flue gas forms a fragmented flow after impacting the primary baffle, and is uniformly mixed with the primary air in the space between the primary and secondary baffles to form a high-temperature, low-oxygen gas; a sodium bicarbonate dry desulfurization tower is installed in the tail flue, resulting in low fly ash content in the desulfurized flue gas, saving on hazardous waste (fly ash produced by waste incinerators) treatment costs; in addition, the use of solar photovoltaic power generation and off-peak electricity utilization technology, which is extremely cheap at night, generates high-temperature primary air, which can further reduce the amount of primary air heating steam used and reduce energy consumption. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 is a flowchart of an environmentally friendly emission system for a waste incinerator according to the present invention;

[0020] Figure 2 is a cross-sectional view of section AA;

[0021] Figure 3 is a flowchart of an environmentally friendly emission system for a waste incinerator according to the present invention;

[0022] Figure 4 is a flowchart of an environmentally friendly emission system for a waste incinerator according to the present invention;

[0023] Figure 5 shows the cross-sectional structure of the ceramic electric radiation heat storage device. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present 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", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present 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 the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may 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 based on the specific circumstances.

[0026] An environmentally friendly emission system for a kitchen waste incinerator, as shown in Figure 1, includes an incinerator 1, a high-temperature heat exchanger 2, a low-temperature heat exchanger 3, a dry desulfurization tower 4, a dust collector 9, and a chimney 8. The flue gas emission pipe of the incinerator 1 is connected to the dry desulfurization tower 4, the outlet of the dry desulfurization tower 4 is connected to the inlet of the dust collector 9, and the outlet of the dust collector 9 is connected to the chimney 8, discharging the purified waste gas. The high-temperature heat exchanger 2 and the low-temperature heat exchanger 3 are sequentially installed on the flue gas duct between the incinerator 1 and the dry desulfurization tower 4. A branch recirculation pipe is installed on the pipeline between the high-temperature heat exchanger 2 and the low-temperature heat exchanger 3, connecting to the inlet of the recirculation fan 10. The outlet of the recirculation fan 10 is connected to each air chamber 12 installed on the waste incinerator 1. High-temperature flue gas, accounting for 10% of the total flue gas volume, is mixed with primary air in the air chamber 12 before entering the furnace to aid combustion, resulting in high furnace temperature, low oxygen content, intense combustion, and reduced nitrogen oxide formation. Cold water passes through the low-temperature heat exchanger 3 and the high-temperature heat exchanger 2 sequentially through the pipeline, gradually heating the cold water to form steam for other uses.

[0027] The waste incinerator 1 has several air chambers 12 arranged in the lower part of the furnace. Each air chamber 12 is equipped with a recirculated flue gas inlet and a primary air inlet. High-temperature flue gas, accounting for 10% of the total volume, mixes with the primary air in the air chamber 12 and is then introduced into the furnace for combustion. Each air chamber 12 is equipped with a primary baffle 15 and a secondary baffle 13. The primary baffle 15 is located in the middle of the inner cavity of the air chamber 12 and above the recirculated flue gas inlet. A channel 14 is formed between the primary baffle 15 and the inner wall of the air chamber 12. Preferably, the edge of the primary baffle 15 has a downward-bent bend, which deflects and mixes the incoming recirculated flue gas before it overflows from the channel 14, causing the recirculated flue gas to impact the primary baffle 15 and form a fragmented flow, promoting a more uniform mixing of the combustion-supporting mixture. The secondary baffle 13 is located on the side wall of the air chamber 12 above the primary baffle 15, and a mixing gas channel is formed in the middle of the secondary baffle 13, communicating with the furnace. The primary air inlet is located on the bottom wall of the air chamber between the primary baffle 15 and the secondary baffle 13. The primary baffle 15 and secondary baffle 13 installed inside the air chamber 12 allow recirculated flue gas to collide with the primary baffle 15 and mix uniformly with the primary air in the space between the primary baffle 15 and the secondary baffle 13, forming a high-temperature, low-oxygen gas. The primary baffle 15 is installed at half the height of the air chamber 12, with a width half the width of the air chamber at the same height, a downward tilt angle of 30-60 degrees, and a height from the bottom of the air chamber that is 1 / 4 of its total height. The secondary baffle 13 is installed at three-quarters the height of the air chamber 12, divided into left and right sections, each with a width 1 / 4 the width of the air chamber at the same height.

[0028] As shown in Figure 2, the dry desulfurization tower 4 includes a tower body and several tangential nozzles 41 arranged on the side of the tower body. The tangential nozzles are connected to an ejector 5, the high-pressure inlet of which is connected to the outlet of an air compressor 7. The ejector inlet of the ejector 5 is connected to a powder silo 6 via a pipe, and the powder silo 6 contains baking soda powder. Preferably, there are 10 tangential nozzles 41, with an inclination angle of 45 degrees, and the height from the bottom is 70% of the total height of the desulfurization tower. High-pressure air draws in the baking soda powder through the ejector 5 and then enters the desulfurization tower 4 through the nozzles 41. In the desulfurization tower 4, the powdered baking soda reacts with the sulfides in the flue gas to undergo a desulfurization reaction. By installing a baking soda dry desulfurization tower 4 in the tail flue, the fly ash content in the desulfurized flue gas is low, saving on hazardous waste (fly ash from waste incinerators) treatment costs.

[0029] As shown in Figure 3, the present invention also includes a waste pretreatment module, which is connected to the waste incinerator 1 via a screw conveyor 33 to introduce the screened and dried waste into the waste incinerator 1 for combustion. The waste pretreatment module includes a waste sorting unit, a drying unit, and an organic processing unit. The waste sorting unit is used to classify kitchen waste into large wet materials and fine materials such as leachate. The waste sorting unit is connected to the drying unit, and large wet materials are fed into the drying chamber 27 of the drying device 30 of the drying unit for drying treatment, and then fed into the waste incinerator 1 for combustion. The waste sorting unit includes a waste storage bin 26 and a sorting device 25. The waste storage bin 26 is connected to the sorting device 25, and the collected waste is fed into the sorting device 25 for sorting. The sorting device 25 can be a centrifugal separator. The sorting device 25 is connected to the processing unit 20, and the sorted fine materials such as leachate are fed into the processing unit 20 for oil-water separation treatment. The processing unit 20 is an oil-water separator, equipped with an oil delivery pipe 23 connected to an external transport module 24, which can be an oil storage tank. The processing unit 20 is also equipped with a liquid delivery pipe 21 connected to a wastewater treatment tank 22, which stores the separated wastewater for later treatment.

[0030] The organic waste residue outlet of the treatment unit 20 is connected to the organic treatment unit via an organic waste residue conveying pipe 19, allowing the organic waste residue to be fed into the organic treatment unit for processing. The organic treatment unit includes an anaerobic digester 18, with the organic waste residue conveying pipe 19 connected to the material inlet of the anaerobic digester 18. The biogas outlet of the anaerobic digester 18 is connected to a combustion mixing device via a conveying pipe, used to burn the generated biogas to heat the air.

[0031] The drying unit 30 includes a drying chamber 27 and an air chamber 29 located at the lower part of the drying chamber 27. The air chamber 29 is provided with ventilation holes and connected to the drying chamber 27, allowing hot air from the air chamber 29 to be introduced into the drying chamber 27 to dry the waste. Preferably, an air cap 28 is provided on the ventilation holes to prevent clogging and to achieve better drying effect.

[0032] Preferably, the chimney 8 is provided with a branch pipe connected to the air chamber 29 of the drying unit 30 via a second fan 34, for using a portion of the flue gas with a temperature up to 150°C to dry the material in the drying chamber 27. The exhaust port of the drying chamber 27 is connected to the furnace of the waste incinerator 1 via a third fan 31, allowing the hot exhaust gas from the drying chamber 27 to be directly fed into the waste incinerator 1 for combustion, heat release, and purification, effectively reducing NOx generation. Since the amount of exhaust gas is small, this portion of humid heat exhaust will not affect the temperature inside the furnace. Preferably, the combustion mixing device includes a combustion mixing chamber 16 and a burner 17 disposed on the inner side wall of the combustion mixing chamber 16. The biogas outlet of the anaerobic digester 18 is connected to the fuel inlet of the burner 17 via a conveying pipe. The biogas produced in the anaerobic digester 18 is burned by the burner 17, and the 150°C flue gas introduced into the combustion mixing chamber 16 is heated to 300°C before being introduced into the drying unit 30 to dry the material to be dried.

[0033] As shown in Figure 4, the present invention also includes a hot air generating device, which comprises a solar thermal storage circulation mechanism and a ceramic electric radiation heat storage device 43 that uses inexpensive off-peak electricity for heat storage. The solar thermal storage circulation mechanism includes a solar photovoltaic power generation module 44 and a thermal storage circulation module. The thermal storage circulation module includes an electric heater 40, a high-temperature molten salt tank 41, a heat exchanger 36, and a low-temperature molten salt tank 38. The electric heater 40 is connected to the high-temperature molten salt tank 41. The high-temperature molten salt tank 41 is connected to the heat exchanger 36 via a first molten salt pump 42. The heat exchanger 36 is connected to the low-temperature molten salt tank 38. The low-temperature molten salt tank 38 is connected to the electric heater 40 via a second molten salt pump 39, forming a thermal storage circulation pipeline. The medium in the thermal storage circulation pipeline is a KNO3 + NaNO3 solution at 350℃-600℃. The solar photovoltaic power generation module 44 is connected to the electric heater 40, providing power to the electric heater 40.

[0034] The ceramic radiant heat accumulator 43 is connected to the power grid 45. The heat generated by electric heating heats the ceramic heat storage body in the accumulator 43 to above 1000℃. The air inlet duct is connected to the heat exchanger 36 via a fourth fan 37, using the heat of the high-temperature molten salt to heat 20℃ cold air to 500℃ hot air. The hot air outlet of the heat exchanger 36 is connected to the air inlet of the ceramic radiant heat accumulator 43, using the heat released by the ceramic heat storage body to heat the 500℃ hot air to 900℃. The outlet of the ceramic radiant heat accumulator 43 is connected to a mixer 35, which is connected to the air chamber 12. The mixer 35 is connected to the first fan 11, used to introduce 20℃ cold air to mix within the mixer 35 to form 200℃ hot air. Based on the above structure, the system of this invention operates as follows: During the day when there is sunlight, the solar photovoltaic power generation module generates electricity while simultaneously heating molten salt through the heat storage circulation module for heat storage, and also heating the air. From midnight to 8 a.m., during off-peak electricity hours, power is supplied to the ceramic electric radiation heat storage device 43 through the power grid to heat the air and simultaneously heat the ceramic heat storage body for heat storage. From sunset to midnight, the system relies on the heat stored in the ceramic heat storage body in the ceramic electric radiation heat storage device 43 and the liquid molten salt in the high-temperature molten salt tank for simultaneous heating. This fully utilizes the inexpensive energy sources of solar energy and off-peak electricity, reducing emissions while saving energy.

[0035] As shown in Figure 5, the ceramic radiant heat storage device 43 includes a housing 438, a ceramic heat storage body 433, and an electric heater 435. Several ceramic heat storage bodies 433 are installed in the housing 438, and an air heating channel 434 is formed between adjacent ceramic heat storage bodies 433. The heat stored in the ceramic heat storage bodies 433 is transferred to the air through the air heating channel 434. The electric heater 435 is installed in the ceramic heat storage body 433 and stores the heat released by the electric heater in the ceramic heat storage body 433. Preferably, two partitions are provided inside the housing 438, and the ceramic heat storage body 433 is fixed between the two partitions. An air inlet 432 and an air outlet 436 are formed between the two partitions and the upper and lower walls of the housing 438, respectively. An air inlet 431 is installed on the air inlet 432, and an air outlet 437 is provided on the air outlet 436. An air passage 437 is provided between the air inlet 432 and the air outlet 436 and the air heating channel 434.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A kitchen waste incinerator environmental protection emission system, characterized in that, The application relates to a waste incinerator, which comprises a waste incinerator, a dry desulfurization tower, a dust remover and a chimney, wherein the waste incinerator is connected with the dry desulfurization tower through a flue gas discharge pipe, the outlet of the dry desulfurization tower is connected with the inlet of the dust remover, the outlet of the dust remover is connected with the chimney, a high-temperature heat exchanger and a low-temperature heat exchanger are arranged on the flue gas pipeline between the waste incinerator and the dry desulfurization tower in sequence, a branch recirculation pipeline is arranged on the pipeline between the high-temperature heat exchanger and the low-temperature heat exchanger and is connected with the inlet of a recirculation fan, and the outlet of the recirculation fan is connected with each air chamber arranged on the waste incinerator.

2. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 1, wherein The lower part of the hearth of the waste incinerator is arranged with a plurality of air chambers, the air chambers are provided with a recirculation flue gas inlet, a primary air inlet, a primary baffle and a secondary baffle, the primary baffle is arranged in the middle of the inner cavity of the air chamber and is located at the upper part of the recirculation flue gas inlet, and the primary air inlet is arranged on the bottom wall of the air chamber between the primary baffle and the secondary baffle.

3. An environmentally friendly exhaust system for a garbage disposal unit according to claim 2, wherein, A channel is formed between the primary baffle and the inner side wall of the air chamber, the edge of the primary baffle is provided with a lower bending part, the primary baffle is installed at 1 / 2 of the height of the air chamber, the width of the primary baffle is 1 / 2 of the width of the air chamber at the same height, the downward inclination angle is 30-60 degrees, and the distance from the bottom is 1 / 4 of the total height of the air chamber.

4. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 3, wherein The secondary baffle is arranged on the side wall of the air chamber at the upper part of the primary baffle, a mixed gas channel is formed in the middle of the secondary baffle and is communicated with the hearth, the secondary baffle is installed at 3 / 4 of the height of the air chamber and is divided into two parts, and the width of each part is 1 / 4 of the width of the air chamber at the same height.

5. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 4, wherein The dry desulfurization tower comprises a tower body and a plurality of tangential nozzles arranged on the side of the tower body, the tangential nozzles are connected with ejectors, the high-pressure inlet of the ejector is connected with the outlet of an air compressor, the injection inlet of the ejector is connected with a powder bin through a pipeline, and the powder bin is filled with baking soda powder, the tangential nozzles are located at 60-80% of the total height from the bottom of the desulfurization tower, the number of the tangential nozzles is 6-12, and the inclination angle is 30-60 degrees.

6. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 5, wherein, The application further relates to a waste pretreatment module, which is connected with the waste incinerator through a screw conveying device, the waste pretreatment module comprises a waste sorting unit, a drying unit and an organic treatment unit, the waste sorting unit is connected with the drying unit, the waste sorting unit comprises a waste storage bin and a sorting device, the waste storage bin is connected with the sorting device, the sorting device is connected with the treatment unit, the treatment unit is provided with an oil conveying pipe connected with an external transportation module, and the treatment unit is provided with a liquid conveying pipe connected with a sewage treatment tank.

7. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 6, wherein The organic waste residue outlet of the treatment unit is connected with the organic treatment unit through an organic waste residue conveying pipe, the organic treatment unit comprises an anaerobic tank, the organic waste residue conveying pipe is connected with the material inlet of the anaerobic tank, and the biogas outlet of the anaerobic tank is connected with a combustion mixing device through a conveying pipe.

8. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 7, characterized in that, The chimney is provided with a branch pipeline connected with the air chamber of the drying unit through a second fan; the exhaust port of the drying chamber is connected with the hearth of the garbage incinerator through a third fan; the combustion mixing device comprises a combustion mixing chamber and a burner arranged on the inner side wall of the combustion mixing chamber, and the biogas outlet of the anaerobic tank is connected with the fuel inlet of the burner through a conveying pipe.

9. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 8, wherein, The hot air generating device comprises a solar heat storage circulating mechanism and a ceramic electric radiation heat accumulator, the solar heat storage circulating mechanism comprises a solar photovoltaic power generation module and a heat storage circulating module, the heat storage circulating module comprises an electric heater, a high-temperature molten salt tank, a heat exchanger and a low-temperature molten salt tank, the electric heater is connected with the high-temperature molten salt tank, the high-temperature molten salt tank is connected with the heat exchanger through a first molten salt pump, the heat exchanger is connected with the low-temperature molten salt tank, the low-temperature molten salt tank is connected with the electric heater through a second molten salt pump, forming a heat storage circulating pipeline; the solar photovoltaic power generation module is connected with the electric heater; the ceramic electric radiation heat accumulator is connected with the power grid; an air inlet pipe is connected with the heat exchanger through a fourth fan, the heat exchanger hot air outlet is connected with the air inlet of the ceramic electric radiation heat accumulator, the outlet of the ceramic electric radiation heat accumulator is connected with the mixer, the mixer is connected with the air chamber, and the mixer is connected with the first fan.

10. The environmentally friendly exhaust system of a kitchen waste incinerator according to claim 9, wherein, The ceramic electric radiation heat accumulator comprises a box body, ceramic heat accumulators and an electric heater, a plurality of ceramic heat accumulators are installed in the box body, gaps are left between adjacent ceramic heat accumulators to form air heating channels, and the electric heater is installed in the ceramic heat accumulators; two partitions are arranged in the box body, the ceramic heat accumulators are fixed between the two partitions, air inlet cavities and air outlet cavities are respectively formed between the two partitions and the upper and lower walls of the box body, an air inlet is installed on the air inlet cavity, an air outlet is arranged on the air outlet cavity, and air holes are arranged between the air inlet cavity, the air outlet cavity and the air heating channels.

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