Environment-friendly discharging system of kitchen garbage incinerator

Abstract

The invention discloses a kitchen garbage incinerator environment-friendly emission system which comprises a garbage incinerator, a dry type desulfurization tower, a dust remover and a chimney, a flue gas emission pipe of the garbage incinerator is connected with the dry type desulfurization tower, an outlet of the dry type desulfurization tower is connected with an inlet of the dust remover, and an outlet of the dust remover is connected with the chimney; a high-temperature heat exchanger and a low-temperature heat exchanger are sequentially arranged on a flue gas pipeline between the garbage incinerator and the dry type desulfurization tower, and a branch recirculation pipeline is arranged on a pipeline between the high-temperature heat exchanger and the low-temperature heat exchanger and connected with an inlet of a recirculation fan. And an outlet of the recycling fan is connected with each air chamber arranged on the garbage incinerator. The method has the beneficial effects that the generation amount of nitric oxide is low, the energy consumption is reduced, and the solid waste treatment cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of kitchen waste incineration, and in particular is an environmentally friendly emission system of a kitchen waste incinerator. Background Art

[0002] Waste disposal has become a key issue in urban development. The composition of municipal solid waste is affected by seasonality and regionality, and fluctuates greatly, but the overall composition is relatively stable, mainly rubber, paper, plastic, food waste and biomass waste. Its average water content is low and the calorific value is high. Therefore, the incineration method for treating municipal solid waste has been widely used.

[0003] The output of kitchen waste in urban solid waste is increasing year by year. Since the water content of kitchen waste is much higher than that of ordinary urban domestic waste, it has a low calorific value and is difficult to ignite. Ordinary urban domestic waste incinerators are no longer suitable for it. It is urgent to develop an energy-saving kitchen waste incinerator that can achieve environmentally friendly emissions.

[0004] In the prior art, in order to solve the above technical problems, the Chinese invention patent application with application number 202311575910.8 discloses an energy-saving combustion system for a garbage incinerator, which includes a garbage incinerator, a sludge heating device, a garbage leachate pool, a water tank and a heat exchanger. The sludge heating device is connected to the feed hopper of the garbage incinerator through a conveyor belt, and the heated sludge is input into the garbage incinerator for combustion. A row pipe is installed on the upper side wall of the furnace of the garbage incinerator. The row pipe includes a first row pipe and a second row pipe. The water tank is connected to the water inlet of the first row pipe through a first water pump, and the water outlet of the first row pipe is connected to the water tank to form a first heating water cycle. The water tank is connected to the water inlet of the second row pipe through a second water pump, and the water outlet of the second row pipe is connected to the sludge heating device, and the sludge heating device is connected to the water tank to form a second heating water cycle. The above-mentioned pipe is installed on the inner wall of the upper part of the furnace to absorb the local high temperature inside the furnace, prevent the coking phenomenon of the inner wall of the furnace caused by the local high temperature, and effectively extend the service life of the waste incinerator; at the same time, the heat absorbed by the pipe is used to heat the sludge heating device, etc. Although the above technical scheme has effectively reduced the energy consumption of sludge drying; it can ensure the stable combustion of low calorific value domestic garbage, sludge and landfill leachate without increasing the use of high calorific value auxiliary fuel; the dust and nitrogen oxide content in the flue gas generated by combustion is extremely low, which can be directly discharged, and the environmental protection benefits are significant. However, the emission of nitrogen oxides is seriously polluting, which proves that reducing the emission of nitrogen oxides is a technical problem that needs to be solved urgently, and there is no corresponding literature report on the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide an environmentally friendly emission system for a kitchen waste incinerator in view of the deficiencies in the above-mentioned prior art, which is specially used for kitchen waste treatment, can save solid waste treatment costs, reduce nitrogen oxide generation and energy consumption.

[0006] The technical solution adopted by the present invention is: an environmentally friendly emission system for a kitchen waste incinerator, comprising a waste incinerator, a dry desulfurization tower, a dust collector and a chimney, wherein the flue gas emission pipe of the waste 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 arranged on the flue gas duct between the waste incinerator and the dry desulfurization tower, a branch recycling duct is arranged on the duct between the high-temperature heat exchanger and the low-temperature heat exchanger and is connected to the inlet of a recycling fan, and the outlet of the recycling fan is respectively connected to each wind chamber arranged on the waste incinerator.

[0007] A plurality of wind chambers are arranged at the lower part of the furnace of the waste incinerator, and the wind chambers are provided with a recycled 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 wind chamber and is located above the recycled flue gas inlet; the primary air inlet is arranged on the bottom wall of the wind chamber between the primary baffle and the secondary baffle.

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

[0009] The edge of the primary baffle has a downward bent portion, which returns and mixes the circulating flue gas sprayed head-on and then overflows from the channel, so that the circulating flue gas hits the primary baffle to form fragmented flows; the primary baffle is installed at 1 / 2 the height of the wind chamber, with a width of 1 / 2 the width of the wind chamber at the same height, a downward inclination angle of 30-60 degrees, and a height from the bottom of 1 / 4 the total height of the wind chamber.

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

[0011] The dry desulfurization tower comprises a tower body and a plurality of tangential nozzles arranged on the side of the tower body, wherein 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 ejection inlet of the ejector is connected to a powder bin through a pipeline, and the powder bin is filled with baking soda powder; the height of the tangential nozzle from the bottom of the desulfurization tower is 60-80% of the total height; the number of the tangential nozzles is 6-12, and the inclination angle is 30-60 degrees.

[0012] It also includes a garbage pre-processing module, which is connected to the garbage incinerator through a screw conveying device; the garbage pre-processing module includes a garbage sorting unit, a drying unit and an organic processing unit, the garbage sorting unit is connected to the drying unit, the garbage sorting unit includes a garbage storage bin and a sorting device, the garbage storage bin is connected to the sorting device; the sorting device is connected to the processing unit; the processing unit is provided with an oil pipeline connected to the external transportation module, and the processing unit is provided with a liquid infusion pipe connected to the sewage treatment tank.

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

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

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

[0016] The ceramic electric radiation heat storage device includes a box body, a ceramic heat storage body and an electric heater. Several of the ceramic heat storage bodies are installed in the box body, and gaps are left between adjacent ceramic heat storage bodies to form an air heating channel. The electric heater is installed in the ceramic heat storage body to store the heat released by the electric heater in the ceramic heat storage body. Preferably, two partitions are arranged in the box body, and the ceramic heat storage body is fixed between the two partitions; an air inlet cavity and an air outlet cavity are formed between the two partitions and the upper and lower walls of the box body, respectively, an air inlet interface is installed on the air inlet cavity, an air outlet interface is arranged in the air outlet cavity, and air holes are arranged between the air inlet cavity and the air outlet cavity and the air heating channel.

[0017] In general, compared with the prior art, the present invention has the following beneficial effects: 10% of the total high-temperature flue gas is introduced into the flue and extracted to mix with the primary air in the wind box, with high temperature, low oxygen content, intense combustion and low nitrogen oxide generation; the high-temperature flue gas can increase the temperature of the primary air, reduce the amount of steam used for heating the primary air, and reduce energy consumption; a primary baffle and a secondary baffle are installed in the wind chamber, and the recycled flue gas hits the primary baffle to form a fragmented flow, which is evenly mixed with the primary air in the space between the primary and secondary baffles to form a high-temperature, low-oxygen gas; a baking soda dry desulfurization tower is installed in the tail flue, and the fly ash content in the flue gas after desulfurization is low, saving the cost of hazardous waste (fly ash generated by garbage incinerators) treatment; in addition, the use of solar photovoltaic power generation and extremely cheap off-peak electricity utilization technology at night to generate high-temperature primary air can further reduce the amount of steam used for heating the primary air and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The process of the environmental protection emission system of a garbage incinerator of the present invention is as follows Figure 1 ;

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

[0021] Figure 3 The process of the environmental protection emission system of a garbage incinerator of the present invention is as follows Figure 2 ;

[0022] Figure 4 The process of the environmental protection emission system of a garbage incinerator of the present invention is as follows Figure 3 ;

[0023] Figure 5 This is a cross-sectional structural diagram of a ceramic electric radiation heat storage device. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] An environmentally friendly emission system for a kitchen waste incinerator, such as Figure 1As shown, it includes a garbage 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 discharge pipe of the garbage 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 to discharge the purified exhaust gas. The high-temperature heat exchanger 2 and the low-temperature heat exchanger 3 are arranged in sequence on the flue gas pipeline between the garbage incinerator 1 and the dry desulfurization tower 4. A branch recirculation pipeline is arranged on the pipeline between the high-temperature heat exchanger 2 and the low-temperature heat exchanger 3 and connected to the inlet of the recirculation fan 10. The outlet of the recirculation fan 10 is respectively connected to each wind chamber 12 arranged on the garbage incinerator 1. The high-temperature flue gas accounting for 10% of the total amount in the flue is mixed with the primary air in the wind chamber 12 and then enters the furnace to assist combustion, so that the temperature in the furnace is high, the oxygen content is low, the combustion is intense, and the generation of nitrogen oxides is reduced. The cold water passes through the low temperature heat exchanger 3 and the high temperature heat exchanger 2 in sequence through the pipeline, and the cold water is gradually heated to form steam for other purposes.

[0027] A plurality of air chambers 12 are arranged at the lower part of the furnace of the waste incinerator 1. The air chamber 12 is provided with a recycled flue gas inlet and a primary air inlet. The high-temperature flue gas accounting for 10% of the total amount is mixed with the primary air in the air chamber 12 and then input into the furnace to assist combustion. A primary baffle 15 and a secondary baffle 13 are arranged in the air chamber 12. The primary baffle 15 is arranged in the middle of the inner cavity of the air chamber 12 and is located at the upper part of the circulating flue gas inlet. A channel 14 is formed between the primary baffle 15 and the inner side wall of the air chamber 12. Preferably, the edge of the primary baffle 15 has a downward bending portion, which returns and mixes the circulating flue gas injected head-on and then overflows from the channel 14, so that the circulating flue gas hits the primary baffle 15 to form a fragmented flow, which promotes a more uniform mixing of the combustion-supporting mixed gas. The secondary baffle 13 is arranged on the side wall of the air chamber 12 above the primary baffle 15, and a mixed gas channel is formed in the middle of the secondary baffle 13 to communicate with the furnace. The primary air inlet is arranged on the bottom wall of the wind chamber between the primary baffle 15 and the secondary baffle 13. The primary baffle 15 and the secondary baffle 13 are installed in the wind chamber 12. After the recycled flue gas hits the primary baffle 15, it is evenly mixed with the primary air in the space between the primary baffle 15 and the secondary baffle 13 to form a high-temperature, low-oxygen gas. The primary baffle 15 is installed at 1 / 2 of the height of the wind chamber 12, with a width of 1 / 2 of the width of the wind chamber at the same height, and is tilted downward at an angle of 30-60 degrees. The height from the bottom is 1 / 4 of the total height of the wind chamber. The secondary baffle 13 is installed at 3 / 4 of the height of the wind chamber 12, and is divided into two left and right pieces, each of which is 1 / 4 of the width of the wind chamber at the same height.

[0028] The dry desulfurization tower 4 is as follows Figure 2As shown, it includes a tower body and several tangential nozzles 41 arranged on the side of the tower body, the tangential nozzle is connected to the ejector 5, the high-pressure inlet of the ejector 5 is connected to the outlet of the air compressor 7, and the ejection inlet of the ejector 5 is connected to the powder bin 6 through a pipeline, and the powder bin 6 contains baking soda powder. Preferably, the number of the tangential nozzles 41 is 10, the inclination angle is 45 degrees, and the height from the bottom is 70% of the total height of the desulfurization tower. High-pressure air sucks baking soda powder through the ejector 5 and enters the desulfurization tower 4 through the nozzle 41. In the desulfurization tower 4, the powdered baking soda reacts with the sulfide in the flue gas to produce a desulfurization reaction. By adding a baking soda dry desulfurization tower 4 in the tail flue, the fly ash content in the flue gas after desulfurization is low, saving the cost of hazardous waste (fly ash generated by the garbage incinerator) treatment.

[0029] like Figure 3 As shown, the present invention also includes a garbage pre-processing module, which is connected to the garbage incinerator 1 through a screw conveying device 33, and introduces the screened and dried garbage into the garbage incinerator 1 for combustion. The garbage pre-processing module includes a garbage sorting unit, a drying unit and an organic processing unit. The garbage sorting unit is used to classify kitchen waste into large wet materials and tiny fine materials such as leachate. The garbage sorting unit is connected to the drying unit, and the large wet materials are input into the drying chamber 27 of the drying device 30 of the drying unit for drying treatment, and then input into the garbage incinerator 1 for combustion. The garbage sorting unit includes a garbage storage bin 26 and a sorting device 25, and the garbage storage bin 26 is connected to the sorting device 25, and the collected garbage is input 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 tiny fine materials such as leachate are input into the processing unit 20 for oil-water separation treatment. The processing unit 20 is an oil-water separator, and is provided with an oil delivery pipe 23 connected to an external transport module 24, and the external transport module can be an oil storage tank. The processing unit 20 is provided with a liquid delivery pipe 21 connected to a sewage treatment tank 22, and the separated sewage is input into the sewage treatment tank 22 for storage and treatment.

[0030] The organic waste residue outlet of the treatment unit 20 is connected to the organic treatment unit through the organic waste residue conveying pipe 19, and the organic waste residue is input into the organic treatment unit for treatment. The organic treatment unit includes an anaerobic tank 18, the organic waste residue conveying pipe 19 is connected to the material inlet of the anaerobic tank 18, and the biogas outlet of the anaerobic tank 18 is connected to the combustion mixing device through a conveying pipe, which is used to burn the generated biogas to heat the air.

[0031] The drying unit 30 includes a drying chamber 27 and a wind chamber 29 disposed at the lower part of the drying chamber 27. The wind chamber 29 is provided with ventilation holes connected to the drying chamber 27, and hot air in the wind chamber 29 is input into the drying chamber 27 to dry the garbage. Preferably, a wind cap 28 is provided on the through hole to avoid clogging of the ventilation hole and achieve a better drying effect.

[0032] Preferably, the chimney 8 is provided with a branch pipeline connected to the air chamber 29 of the drying unit 30 through the second fan 34, which is used to quote part of the flue gas with a temperature of up to 150°C for drying the materials in the drying chamber 27. The exhaust port of the drying chamber 27 is connected to the furnace of the garbage incinerator 1 through the third fan 31, and the hot exhaust gas of the drying chamber 27 is directly input into the garbage incinerator 1 for combustion, heat release and purification, which can effectively reduce the generation of NOX. Since the amount of exhaust gas is small, this part of the wet and hot exhaust gas will not affect the temperature in the furnace. Preferably, the combustion mixing device includes a combustion mixing chamber 16 and a burner 17 arranged on the inner wall of the combustion mixing chamber 16, and the biogas outlet of the anaerobic tank 18 is connected to the fuel inlet of the burner 17 through a conveying pipe. The biogas generated by the anaerobic tank 18 is burned through the burner 17, and the 150°C flue gas introduced is heated to 300°C in the combustion mixing chamber 16, and then introduced into the drying unit 30 to dry the material to be dried.

[0033] like Figure 4 As shown, the present invention also includes a hot air generating device, which includes a solar heat storage cycle mechanism and a ceramic electric radiation heat storage device 43 that uses cheap low-valley electricity to store heat. The solar heat storage cycle mechanism includes a solar photovoltaic power generation module 44 and a heat storage cycle module. The heat storage cycle 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, and the high-temperature molten salt tank 41 is connected to the heat exchanger 36 through a first molten salt pump 42. The heat exchanger 36 is connected to the low-temperature molten salt tank 38, and the low-temperature molten salt tank 38 is connected to the electric heater 40 through a second molten salt pump 39 to form a heat storage cycle pipeline. Among them, the medium of the heat storage cycle pipeline is 350℃-600℃ KNO 3 +NaNO 3 The solar photovoltaic power generation module 44 is connected to the electric heater 40 to provide power for the electric heater 40 .

[0034] The ceramic electric radiation heat accumulator 43 is connected to the power grid 45. The heat generated by electric heating is used to heat the ceramic heat accumulator in the ceramic electric radiation heat accumulator 43 to above 1000°C. The air inlet pipe is connected to the heat exchanger 36 through the fourth fan 37, and the heat of the high-temperature molten salt is used to heat the 20°C cold air to 500°C hot air. The heat exchanger hot 36 air outlet is connected to the air inlet of the ceramic electric radiation heat accumulator 43, and the ceramic heat accumulator releases heat to heat the 500°C hot air to 900°C. The outlet 43 of the ceramic electric radiation heat accumulator is connected to the mixer 35, and the mixer 35 is connected to the wind chamber 12. The mixer 35 is connected to the first fan 11, and is used to introduce 20°C cold air to mix in the mixer 35 to form 200°C hot air. Based on the above structure, the system of the present invention operates as follows: when there is sunlight during the day, the solar photovoltaic power generation module generates electricity while heating the molten salt through the heat storage circulation module for heat storage and also heats the air. From 24:00 to 8:00 in the morning, it is a low-peak electricity period. The power grid supplies power to the ceramic electric radiation heat storage device 43 to heat the air and heat the ceramic heat storage body for heat storage. After the sun sets and until 24:00 in the evening, the heat stored by 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 is used for heating at the same time. The cheap energy of solar energy and low-peak electricity is fully utilized to reduce emissions and save energy.

[0035] like Figure 5 As shown, the ceramic electric radiation heat storage device 43 includes a box body 438, a ceramic heat storage body 433 and an electric heater 435. Several of the ceramic heat storage bodies 433 are installed in the box body 438, and an air heating channel 434 is formed between adjacent ceramic heat storage bodies 433. The heat stored in the ceramic heat storage body 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 the heat released by the electric heater is stored in the ceramic heat storage body 433. Preferably, two partitions are arranged in the box body 438, and the ceramic heat storage body 433 is fixed between the two partitions, and an air inlet chamber 432 and an air outlet chamber 436 are respectively formed between the two partitions and the upper and lower walls of the box body 438, an air inlet interface 431 is installed on the air inlet chamber 432, and an air outlet interface 437 is arranged in the air outlet chamber 436, and an air through hole 437 is arranged between the air inlet chamber 432 and the air outlet chamber 436 and the air heating channel 434.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A kitchen waste incinerator environmentally friendly emission system, characterized in that: It includes a waste incinerator, a dry desulfurization tower, a dust collector and a chimney, wherein the flue gas emission pipe of the waste 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 arranged on the flue gas duct between the waste incinerator and the dry desulfurization tower, a branch recycling duct is arranged on the duct between the high-temperature heat exchanger and the low-temperature heat exchanger and is connected to the inlet of the recycling fan, and the outlet of the recycling fan is respectively connected to each wind chamber arranged on the waste incinerator.

2. The environmentally friendly emission system for a kitchen waste incinerator according to claim 1, characterized in that: A plurality of wind chambers are arranged at the lower part of the furnace of the waste incinerator, and the wind chambers are provided with a recycled 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 wind chamber and is located above the recycled flue gas inlet; the primary air inlet is arranged on the bottom wall of the wind chamber between the primary baffle and the secondary baffle.

3. The environmentally friendly discharge system for kitchen waste stove according to claim 2, characterized in that: A channel is formed between the primary baffle and the inner wall of the wind chamber; the edge of the primary baffle has a downwardly bent portion; the primary baffle is installed at 1 / 2 the height of the wind chamber, with a width of 1 / 2 the width of the wind chamber at the same height, a downward inclination angle of 30-60 degrees, and a height from the bottom of 1 / 4 the total height of the wind chamber.

4. The environmentally friendly emission system for a kitchen waste incinerator according to claim 3, characterized in that: The secondary baffle is arranged on the side wall of the wind chamber above the primary baffle, and a mixed gas channel is formed in the middle of the secondary baffle to communicate with the furnace; the secondary baffle is installed at 3 / 4 of the height of the wind chamber, and is divided into two left and right parts, and the width of each part is 1 / 4 of the width of the wind chamber at the same height.

5. The environmentally friendly emission system for a kitchen waste incinerator according to claim 4, characterized in that: The dry desulfurization tower comprises a tower body and a plurality of tangential nozzles arranged on the side of the tower body, wherein 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 ejection inlet of the ejector is connected to a powder bin through a pipeline, and the powder bin is filled with baking soda powder; the height of the tangential nozzle from the bottom of the desulfurization tower is 60-80% of the total height; the number of the tangential nozzles is 6-12, and the inclination angle is 30-60 degrees.

6. The environmentally friendly emission system for a kitchen waste incinerator according to claim 5, characterized in that: It also includes a garbage pre-processing module, which is connected to the garbage incinerator through a screw conveying device; the garbage pre-processing module includes a garbage sorting unit, a drying unit and an organic processing unit, the garbage sorting unit is connected to the drying unit, the garbage sorting unit includes a garbage storage bin and a sorting device, the garbage storage bin is connected to the sorting device; the sorting device is connected to the processing unit; the processing unit is provided with an oil pipeline connected to the external transportation module, and the processing unit is provided with a liquid infusion pipe connected to the sewage treatment tank.

7. The environmentally friendly emission system for a kitchen waste incinerator according to claim 6, characterized in that: The organic waste residue outlet of the processing unit is connected to the organic processing unit through an organic waste residue conveying pipe; the organic processing unit includes an anaerobic tank, the organic waste residue conveying pipe is connected to the material inlet of the anaerobic tank, and the biogas outlet of the anaerobic tank is connected to the combustion mixing device through a conveying pipe.

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

9. The environmentally friendly emission system for a kitchen waste incinerator according to claim 8, characterized in that: The invention also includes a hot air generating device, which includes a solar heat storage circulation mechanism and a ceramic electric radiation heat accumulator. The solar heat storage circulation mechanism includes a solar photovoltaic power generation module and a heat storage circulation module. The heat storage circulation module includes 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, the high-temperature molten salt tank is connected to the heat exchanger through a first molten salt pump, the heat exchanger is connected to the low-temperature molten salt tank, and the low-temperature molten salt tank is connected to the electric heater through a second molten salt pump to form a heat storage circulation pipeline; the solar photovoltaic power generation module is connected to the electric heater; the ceramic electric radiation heat accumulator is connected to the power grid; the air inlet pipe is connected to the heat exchanger through a fourth fan, the hot air outlet of the heat exchanger is connected to the air inlet of the ceramic electric radiation heat accumulator, the outlet of the ceramic electric radiation heat accumulator is connected to the mixer, the mixer is connected to the wind chamber, and the mixer is connected to the first fan.

10. The environmentally friendly emission system of a kitchen waste incinerator according to claim 9, characterized in that: The ceramic electric radiation heat storage device includes a box body, a ceramic heat storage body and an electric heater. Several of the ceramic heat storage bodies are installed in the box body, and gaps are left between adjacent ceramic heat storage bodies to form an air heating channel. The electric heater is installed in the ceramic heat storage body; two partitions are arranged in the box body, and the ceramic heat storage body is fixed between the two partitions. An air inlet cavity and an air outlet cavity are formed between the two partitions and the upper and lower walls of the box body respectively. An air inlet interface is installed on the air inlet cavity, and an air outlet interface is arranged in the air outlet cavity. Air holes are arranged between the air inlet cavity, the air outlet cavity and the air heating channel.

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