Garbage disposal device and garbage disposal method

Abstract

The present invention relates to a garbage disposal device and a garbage disposal method, comprising an incinerator body, a garbage storage chamber and a closed belt conveyor, wherein the incinerator body has an A furnace chamber and a B furnace chamber of the same size arranged side by side, and the flue gas pipe between the A and B chambers is connected to a multi-stage purification treatment container, and the garbage disposal method of the present invention is as follows: 1. The garbage to be disposed is sent into two furnace chambers separated in the incinerator; 2. When one furnace chamber burns the garbage, the other furnace chamber is in a drying state; 3. The two furnace chambers are mutually converted for use; 4. The collected flue gas enters the flue gas combustion chamber and burns again, and the flue gas stays in the flue gas combustion chamber for more than 2 seconds, and the combustion temperature is 1050 degrees and finally enters the multi-stage purification treatment and discharge. The garbage disposal device and method realize good flue gas treatment and improve the garbage disposal efficiency.

Description

Technical Field

[0001] The invention relates to a distributed on-site energy-based environmentally friendly treatment furnace for domestic garbage, and in particular to a garbage treatment device and a garbage treatment method. Background Art

[0002] At present, most of the domestic garbage in rural areas, towns and small and medium-sized cities is landfilled, and the garbage has not been reduced or recycled, and the serious secondary pollution is very persistent; while the simple incinerator incineration method seriously pollutes the atmosphere and the surrounding environment, and will cause serious neighbor avoidance incidents. In traditional garbage incineration, manual handling and feeding, high labor intensity, and poor working environment, the amount of garbage processed is very limited, and it does not meet the national environmental protection requirements at all. Although the garbage incinerators of large garbage power plants are advanced in technology and can meet the environmental protection standards, they require huge investments, and in order to maintain stable power generation, they must have a huge amount of garbage tonnage sources. Basically, they can only be set up around large and medium-sized cities and have a self-sufficient rated design processing capacity; therefore, it is impossible to spend huge freight to collect the domestic garbage in rural areas and small and medium-sized towns. Therefore, society and the market urgently need a garbage resource processing and environmental protection incinerator that saves investment, can be distributed on-site processing, and can meet national environmental protection requirements and bring economic benefits. Therefore, a distributed on-site energy environmental protection treatment furnace for domestic garbage in the present invention can completely solve the above-mentioned problems. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned difficulties, to provide a kind of incineration furnace and garbage treatment method with integrated structure, small footprint, safe and reliable operation, automatic control of garbage feeding without manual feeding, automatic control of ash and slag discharge, and on-site distributed environmental protection standard incineration treatment furnace for various types of domestic garbage in rural areas, communities, scenic spots, enterprises, institutions, schools, hospitals, small and medium-sized towns. The environmentally friendly incineration treatment furnace achieves no harmful gas emissions and no wastewater discharge to the outside, and timely reduces and eliminates the discharge of garbage leachate to the outside. The slag after garbage incineration can be used to make organic fertilizer, or mixed and solidified using a new geopolymer process. Therefore, no secondary pollution will be generated, and the garbage can be reduced and recycled, and a large amount of high-temperature hot water steam can be produced using waste heat, which is convenient for customers' heating, cooling and domestic hot water, and generates better economic benefits for users.

[0004] The technical solution of the present invention is:

[0005] A domestic waste treatment device comprises an incinerator body, a waste storage chamber and a closed belt conveyor, wherein a furnace chamber A and a furnace chamber B of the same size are arranged side by side in the incinerator body, and the two furnace chambers A and B of the incinerator are independent of each other. A feeding well is provided on the top of the furnace chamber A and the furnace chamber B, and a sealing cover is provided on the feeding well. The gap between the sealing cover and the feeding well is sealed with fine sand filler. The waste in the waste storage chamber is conveyed to the feeding well at the top of the A chamber and the B chamber through the closed belt conveyor, and a horizontal feeding port is provided on the side wall of the A chamber and the B chamber for adding larger waste, and the horizontal feeding port is fed with waste through a horizontally propelled explosion-proof waste storage box.

[0006] The garbage disposal device is equipped with various temperature display instruments, automatic control electric switches and a control console for real-time monitoring of exhaust emission indicators.

[0007] The incinerator body consists of two furnace chambers of the same size, A and B. The two chambers AB are isolated from each other and are both under negative pressure. When the garbage in one furnace chamber is burned, the heat can be transferred to the other furnace chamber, so the garbage can be dried to facilitate smooth combustion next time. The gap between the cover and the feeding well mouth is sealed with fine sand filler to ensure continuous feeding without smoke leakage. The garbage storage room can absorb the odor of garbage into the incinerator body through negative pressure suction. The garbage feeding port is at the top of the incinerator body. The garbage enters the high-temperature incinerator that relies on the self-weight sedimentation of high-position garbage from the garbage storage room through a fully enclosed belt elevator. Large garbage can be horizontally pushed into the horizontal feeding port below the side wall of the furnace chamber through an explosion-proof garbage storage box with a glass window.

[0008] The incinerator flue gas outlet flange is sealed and connected to an environmentally friendly purification container for multi-stage deep purification treatment. The garbage disposal device is also equipped with various temperature display instruments, automatic control electric switches and a control console for real-time monitoring of exhaust emission indicators.

[0009] Furthermore, the A and B furnace chambers of the incinerator are arranged with high temperature resistant refractory bricks, and an insulation layer is arranged outside the high temperature resistant refractory bricks for heat insulation. The outer shell is wrapped with a steel plate. The bottom of the A and B furnace chambers are each arranged with a plurality of metal brackets with triangular steel bars welded at the ports.

[0010] Furthermore, a furnace chamber bottom plate with a plurality of through holes is provided at the bottom of the furnace chamber A and the furnace chamber B of the incinerator, an ash storage chamber is provided below the furnace chamber bottom plate, and a spiral automatic slag discharger is installed in the ash storage chamber.

[0011] Furthermore, a common Z-shaped reciprocating flue gas passage is arranged between the A furnace chamber and the B furnace chamber, and an infrared energy-saving combustion head of an alcohol-based fuel burner and an infrared heating silicon carbide resistor are arranged in the flue gas passage. The above components constitute a secondary combustion chamber. After the high-temperature oxygen-rich flue gas produced after combustion in the furnace chamber is introduced into the Z-shaped reciprocating flue gas passage by negative pressure, it is secondary burned while being retained in the Z-shaped high-temperature flue gas passage, thereby strictly controlling the generation of dioxins. The Z-shaped reciprocating flue gas passage can allow the flue gas to be retained in the flue for more than 2 seconds, which is convenient for sufficient combustion treatment.

[0012] Furthermore, a plurality of circulating water heating metal tubes are arranged in a matrix above the secondary combustion chamber. The circulating water heating metal tubes are arranged between furnace chamber A and furnace chamber B, and the circulating water heating metal tubes are externally connected to an insulated water tank.

[0013] Furthermore, the Z-shaped reciprocating flue gas channel is connected to a waste heat exchanger outside the incinerator body, and the waste heat exchanger is connected to an insulation water tank.

[0014] Furthermore, the flue gas pipeline of the waste heat exchanger is connected to the multi-stage purification processing container, that is, the high-temperature flue gas discharged from the incinerator body enters the multi-stage purification processing container after being cooled by the waste heat exchanger.

[0015] Furthermore, the multi-stage purification treatment container is composed of multi-stage purification units connected by sealed pipes, that is, the flue gas discharged from the incinerator passes through the spray cooling urea liquid treatment unit, limestone foam solution unit, magnesium oxide foam solution unit, caustic soda foam solution unit, detergent foam solution unit and low-temperature plasma purification box and activated carbon filter box with flue pipe in sequence, and is finally discharged from the total flue gas outlet pipe.

[0016] Furthermore, a high-pressure induced draft fan is provided on the pipeline between the urea liquid treatment unit and the limestone foam solution unit, and on the pipeline between the magnesium oxide foam solution unit and the alkali foam solution unit.

[0017] Furthermore, the limestone foam solution unit, magnesium oxide foam solution unit, caustic soda foam solution unit, and detergent foam solution unit are each equipped with two nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates, which are laterally arranged in the box body along the flue gas flow direction, and the nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates are assembled from a grid fence, a titanium-nickel-chromium stainless steel wire ball uniformly distributed layer, and a stainless steel mesh plate, and the titanium-nickel-chromium stainless steel wire ball uniformly distributed layer is sandwiched between the square grid fence and the stainless steel mesh plate.

[0018] The box is filled with urea solution, and three layers of uniform mesh plates are evenly distributed from top to bottom in the box. The uniform mesh plates are arranged on the cross section through which the smoke passes in the urea liquid treatment unit. The air intake pipe of the urea solution box passes through the three layers of uniform mesh plates from top to bottom. The bottom of the urea liquid treatment unit is provided with a bottom valve, and a circulating booster pump and an overflow pipe are also provided below the urea liquid treatment unit box. The circulating booster pump sends the urea solution to the atomizing nozzle at the end of the pipeline through the pipeline and then sprays it onto the uniform mesh plates. The smoke passes through the three layers of uniform mesh plates sprayed with urea solution in turn and is discharged from the air outlet of the urea liquid treatment unit. The overflow pipe is connected to a reclaimed water storage barrel to store the overflowed mixed solution, and the bottom valve at the bottom of the box is used to clean and discharge the solid waste residue after neutralization and adsorption.

[0019] A garbage disposal method comprises the following steps:

[0020] S1. The garbage to be processed is sent into two adjacent and independent furnace chambers separated in the incinerator by negative pressure suction;

[0021] S2, the waste heat from burning garbage in one furnace cavity is transferred to another furnace cavity to dry the garbage stored in the other furnace cavity;

[0022] S3, the two furnace chambers are switched to each other;

[0023] S4. The collected flue gas enters the Z-type flue gas combustion chamber and is ignited and burned by an alcohol-based fuel burner to ensure that the flue gas stays in the flue gas combustion chamber for more than 2 seconds and the combustion temperature is 850-1050 degrees;

[0024] S5, the flue gas after combustion in step S4 enters into multi-stage purification treatment and then is discharged;

[0025] The garbage automatic control feeding and garbage belt conveyor elevator processed by the present invention are in a fully sealed form, the discharge port is connected to the incinerator body in a closed manner, and a spiral automatic slag discharger is installed in the ash storage room at the bottom of the incinerator, realizing environmentally friendly, closed and automated feeding and slag discharge;

[0026] The incinerator is equipped with a metal water pipe that fully utilizes the incineration heat to heat a large amount of water in a matrix-like manner, and is connected to an insulation water tank to realize the resource utilization of garbage treatment;

[0027] The flue gas and tail gas of this incinerator are sealed and enter the environmental protection purification square box for deep treatment after being pre-treated in the furnace. That is, the flue gas passes through: the square box of urea liquid with multi-stage spray rapid cooling, high-pressure induced draft fan, limestone foam solution box, magnesium oxide foam solution box, caustic soda foam solution box, detergent foam solution box, and low-temperature plasma purification box for adsorption purification. After being catalyzed by the turbulent stainless steel ball fence plate of nickel-titanium-chromium metal catalyst, the flue gas is dust-removed, denitrated, desulfurized, deacidified and other harmful substances are removed. The garbage is treated in an environmentally friendly manner.

[0028] The multi-stage purification treatment unit is equipped with corresponding multiple grey water storage tanks and water treatment tanks to ensure that no waste water is discharged from the system.

[0029] The incinerator is equipped with a temperature meter and an operating table with real-time data display screen for monitoring, which is convenient for environmental protection on-site supervision and remote monitoring.

[0030] The garbage disposal device has a compact design, automatic operation control, reduces manual feeding, and can achieve distributed local and nearby treatment of domestic garbage, saving costs. There is no discharge of wastewater, smoke and dust. After simple classification and treatment, the garbage can be digested immediately on the same day of garbage disposal, and the garbage only needs to be simply classified into organic and inorganic matter, without strict classification, and both dry and wet garbage can be handled in time. Automatic spiral sealing slag discharge is adopted, and there is no dust pollution. The waste slag can be mixed and solidified with a new type of geopolymer. The garbage incineration flue gas is burned at more than 850 degrees in the furnace and the high-temperature oxygen-enriched secondary combustion chamber is turbulently rotated at more than 1050 degrees for more than 2 seconds before burning, achieving good pretreatment of the flue gas. The flue gas at the tail of the furnace is then sealed and enters the overall environmental protection deep purification box, achieving a complete reduction of harmful flue gas with full coverage and no escape, and achieving garbage incineration without visible black smoke and white smoke emissions, clean and environmentally friendly. By heating the water pipes in the incinerator to produce a large amount of hot water, which can be used for heating and cooling energy, or to generate electricity, the garbage can be distributed, on-site, harmless, reduced in volume, and resource-based and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the structural system of the present invention

[0032] Figure 2 It is a schematic diagram of the turbulent stainless steel wire ball fence of the nickel-titanium-chromium metal catalyst of the present invention;

[0033] Figure 3 It is a schematic structural diagram of the urea liquid treatment unit of the present invention.

[0034] 1- incinerator body, 2- garbage storage room, 3- closed belt conveyor, 4- explosion-proof garbage storage box, 5- circulating water heating metal pipe, 6- spiral automatic slag discharger, 7- multi-stage purification container, 8- control console, 9- ash storage room, 10- furnace bottom plate, 11- feeding wellhead, 12- horizontal feeding port, 13- secondary combustion chamber, 14- waste heat exchanger, 15- metal bracket, 16- insulation water tank, 17- urea liquid treatment unit, 18- high pressure induced draft fan, 19- limestone foam solution Liquid unit, 20-magnesium oxide foam solution unit, 21-caustic soda foam solution unit, 22-detergent foam solution unit, 23-nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence, 24 low-temperature plasma purification box, 25-activated carbon filter box with flue pipe, 26-flue gas main outlet pipeline, 171-urea liquid treatment unit outlet, 172-uniform mesh plate, 173-atomizing nozzle, 174-circulation booster pump, 175-overflow pipeline, 176-urea solution tank air inlet pipeline, 177-bottom valve,

[0035] 231- Grid fence, 232- Titanium nickel chromium stainless steel wire ball uniform distribution layer, 233- Stainless steel mesh plate. DETAILED DESCRIPTION

[0036] Referring to the accompanying drawings, a domestic waste treatment device includes an incinerator body 1, a garbage storage chamber 2 and a closed belt conveyor 3. The incinerator body 1 is provided with a furnace chamber A and a furnace chamber B of the same size side by side. The tops of the furnace chambers A and B are provided with a feeding wellhead 11, and a cover is provided on the feeding wellhead 11. The gap between the cover and the feeding wellhead 11 is sealed with fine sand filler. The garbage in the garbage storage chamber 2 is sent to the feeding wellhead 11 at the top of the A chamber and the B chamber through the closed belt conveyor 3. A horizontal feeding port 12 is opened below the side walls of the furnace chambers A and B, and the horizontal feeding port 12 is fed through a horizontally propelled explosion-proof garbage storage box 4.

[0037] According to the further improvement of the above technical solution, high-temperature resistant refractory bricks are arranged in the A and B furnace chambers of the incinerator 1, and an insulation layer is arranged outside the high-temperature resistant refractory bricks for heat insulation. The outer shell is wrapped by steel plates, and a number of metal brackets 15 with triangular steel bars welded to the bottom of the A and B furnace chambers are arranged respectively.

[0038] According to a further improvement of the above technical solution, a furnace chamber bottom plate 10 with a plurality of through holes is provided at the bottom of the A furnace chamber and the B furnace chamber of the incinerator body 1, an ash storage chamber 9 is provided below the furnace chamber bottom plate 10, and a spiral automatic slag discharger 6 is installed in the ash storage chamber 9.

[0039] According to the further improvement of the above technical solution, a common Z-shaped reciprocating flue gas channel is arranged between the A furnace chamber and the B furnace chamber, and an infrared energy-saving combustion head of an alcohol-based fuel burner and an infrared heating silicon carbide resistor are arranged in the flue gas channel, and the above components constitute a secondary combustion chamber 13.

[0040] According to a further improvement of the above technical solution, a plurality of circulating water heating metal tubes 5 are arranged in a matrix above the secondary combustion chamber 13. The circulating water heating metal tubes 5 are arranged between furnace chamber A and furnace chamber B, and the circulating water heating metal tubes 5 are externally connected to an insulated water tank 16.

[0041] According to a further improvement of the above technical solution, the Z-shaped reciprocating flue gas channel is connected to the waste heat exchanger 14 outside the incinerator body 1 , and the waste heat exchanger 14 is connected to the insulation water tank 16 .

[0042] According to a further improvement of the above technical solution, the flue gas pipeline of the waste heat exchanger 14 is connected to the multi-stage purification processing container 7, that is, the high-temperature flue gas discharged from the incinerator body 1 enters the multi-stage purification processing container 7 after being cooled by the waste heat exchanger 14.

[0043] According to a further improvement of the above technical solution, the multi-stage purification treatment container 7 is composed of multi-stage purification units connected by sealed pipes, that is, the flue gas discharged from the incinerator passes through the spray cooling urea liquid treatment unit 17, the limestone foam solution unit 19, the magnesium oxide foam solution unit 20, the caustic soda foam solution unit 21, the detergent foam solution unit 22, the low-temperature plasma purification box 24 and the activated carbon filter box 25 with a flue pipe, and is finally discharged from the flue gas main outlet pipe 26.

[0044] According to a further improvement of the above technical solution, a high-pressure induced draft fan 18 is provided on the pipeline between the urea liquid treatment unit 17 and the limestone foam solution unit 19 and on the pipeline between the magnesium oxide foam solution unit 20 and the alkali foam solution unit 21 .

[0045] According to the further improvement of the above technical scheme, two nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates 23 are installed in the limestone foam solution unit 19, the magnesium oxide foam solution unit 20, the caustic soda foam solution unit 21, and the detergent foam solution unit 22. The nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates 23 are transversely arranged in the box body along the flue gas flow direction. The nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates 23 are assembled from square grid fences 231, titanium-nickel-chromium stainless steel wire ball uniform distribution layers 232 and stainless steel mesh plates 233. The titanium-nickel-chromium stainless steel wire ball uniform distribution layers 232 are sandwiched between the square grid fences 231 and the stainless steel mesh plates 233.

[0046] The box is filled with urea solution, and three layers of uniform mesh plates 172 are evenly distributed from top to bottom in the box. The uniform mesh plates 172 are arranged on the cross section through which the flue gas passes in the urea liquid treatment unit 17. The urea solution tank air intake pipe 176 passes through the three layers of uniform mesh plates 172 from top to bottom. A bottom valve 177 is provided at the bottom of the urea liquid treatment unit 17. A circulating booster pump 174 and an overflow pipe 175 are also provided below the box of the urea liquid treatment unit 17. The circulating booster pump 174 delivers the urea solution to the atomizing nozzle 173 at the end of the pipeline through a pipeline and then sprays it onto the uniform mesh plates 172. The flue gas passes through the three layers of uniform mesh plates 172 sprayed with urea solution in turn and is discharged from the gas outlet 171 of the urea liquid treatment unit. The overflow pipe 175 is connected to a reclaimed water storage barrel to store the overflowed mixed solution. The bottom valve 177 at the bottom of the box is used to clean and discharge the solid waste residue after neutralization and adsorption.

[0047] A garbage disposal method comprises the following steps:

[0048] S1. The garbage to be processed is sent into two adjacent and independent furnace chambers separated in the incinerator by negative pressure suction;

[0049] S2: When one furnace cavity is burning garbage, the other furnace cavity is in the state of drying and storing garbage;

[0050] S3, the two furnace chambers are switched to each other;

[0051] S4. The collected flue gas enters the flue gas combustion chamber and is burned by an alcohol-based fuel burner to ensure that the flue gas stays in the flue gas combustion chamber for more than 2 seconds and the combustion temperature is 850-1050 degrees;

[0052] S5, the flue gas after combustion in step S4 enters a multi-stage purification process;

[0053] The two furnace chambers A and B of the garbage disposal device are combined into a container appearance, but the two furnace chambers A and B are furnace chambers with independent spaces. The A and B furnace chambers and the furnace body have the same outer dimensions, and are all rectangular vertical boxes. That is, the heat transfer sleeve of the A furnace chamber during combustion is inside the B furnace chamber, so that the B furnace chamber is in a state of drying and storing garbage. The A and B furnace chambers can be converted into each other, and the two furnace chambers are separated in space and connected as a whole by the outer shell.

[0054] There is a flue gas secondary combustion chamber between the A and B furnace chambers. The flue gas secondary combustion chamber is a rectangular upper and lower channel folded into a Z shape. It is to ensure that the flue gas generated by the incinerator stays in the high-temperature secondary combustion chamber for more than 2 seconds, strictly controlling the generation and destruction of dioxins. A self-made automatic control alcohol-based fuel burner is arranged at the bottom of the high-temperature secondary combustion chamber to increase the temperature to 1050 degrees during the secondary combustion of flue gas. The top cover of the A and B furnace chambers is equipped with a feeding port and a sealing cover. The flue gas sealing of the sealing gap adopts a fine sand filling sealing method. The incinerator relies on the natural feeding form of the self-weight sedimentation of high-level garbage during combustion, that is, the ash produced after the garbage is burned falls into the ash storage chamber through the through hole on the furnace chamber bottom plate 10, and the ash is discharged by the spiral automatic slag discharger. Since there is a high-pressure induced draft fan in the environmentally friendly purification square box to continuously induce air, there is a negative pressure in the furnace chamber, the closed belt elevator and the garbage storage chamber, so that the garbage odor does not leak and does not pollute the surrounding air. When large pieces of garbage need to be manually pushed horizontally, a backfire-proof and explosion-proof garbage storage box with a glass window is used to push it in from the horizontal feeding port; The heat energy in the flue gas channel between the A and B chambers of the high-temperature incinerator can be utilized by connecting the waste heat exchanger with a large number of matrix-arranged circulating water heating water pipes, and the waste heat exchanger is then connected to the insulated water tank storing high-temperature hot water; a triangular slope ash hopper is provided at the bottom of the incinerator, which is a long strip bracket with a triangular end face welded by steel bars, and is hollowed out inside to facilitate the passage of oxygen so that the garbage in the furnace chamber is fully and stably burned. An ash storage chamber is provided at the bottom of the furnace chamber, and a spiral automatic slag discharger is provided in the ash storage chamber. The flue gas outlet of the waste heat exchanger is sealed and connected to the flue gas inlet flange of the environmental protection purification box, and the flue gas tail gas is purified in the environmental protection purification rectangular container for multi-stage deep purification, and the dust removal, denitrification, desulfurization, deacidification and other harmful substances of the flue gas are fully realized. To achieve complete environmental protection and standard treatment of garbage, this garbage disposal device is also equipped with various temperature display instruments and automatic control electric switches and a control console for real-time digital display monitoring of exhaust emission indicators.

Claims

1. A domestic waste treatment device, characterized in that: The incinerator comprises an incinerator body (1), a garbage storage chamber (2) and a closed belt conveyor (3), wherein the incinerator body (1) is provided with a furnace chamber A and a furnace chamber B of the same size side by side, the furnace chamber A and the furnace chamber B are both provided with a charging well (11) at the top, a sealing cover is provided on the charging well (11), and a gap between the sealing cover and the charging well (11) is sealed with fine sand filler, and garbage in the garbage storage chamber (2) is conveyed to the charging well (11) at the top of the A chamber and the B chamber through the closed belt conveyor (3), and a horizontal charging port (12) is opened below the side wall of the A chamber and the B chamber, and the horizontal charging port (12) is fed with garbage through a horizontally propelled explosion-proof garbage storage box (4); A secondary combustion chamber (13), wherein a plurality of circulating water heating metal pipes (5) are arranged in a matrix above the secondary combustion chamber (13), wherein the circulating water heating metal pipes (5) are arranged between furnace chamber A and furnace chamber B, and the circulating water heating metal pipes (5) are externally connected to a heat preservation water tank (16); A Z-shaped reciprocating flue gas channel is provided between the furnace chamber A and the furnace chamber B, and an infrared energy-saving combustion head of an alcohol-based fuel burner and an infrared heating silicon carbide resistor are provided in the flue gas channel; The Z-shaped reciprocating flue gas channel is connected to a waste heat exchanger (14) outside the incinerator body (1), and the waste heat exchanger (14) is connected to a heat preservation water tank (16); The flue gas pipeline of the waste heat exchanger (14) is connected to the multi-stage purification processing container (7), that is, the high-temperature flue gas discharged from the incinerator body (1) enters the multi-stage purification processing container (7) after being cooled by the waste heat exchanger (14).

2. A domestic waste treatment device according to claim 1, characterized in that: High temperature resistant refractory bricks are arranged in the A and B furnace chambers of the incinerator body (1), and a heat insulation layer is arranged outside the high temperature resistant refractory bricks. The outer shell is wrapped by steel plates. A plurality of metal brackets (15) with triangular steel bars welded to the bottom of the A and B furnace chambers are arranged respectively.

3. A domestic waste treatment device according to claim 2, characterized in that: The bottoms of furnace chambers A and B of the incinerator body (1) are provided with furnace chamber bottom plates (10) with a plurality of through holes, an ash storage chamber (9) is provided below the furnace chamber bottom plates (10), and a spiral automatic slag discharger (6) is installed in the ash storage chamber (9).

4. A domestic waste treatment device according to claim 1, characterized in that: The multi-stage purification treatment container (7) is composed of multi-stage purification units connected by sealed pipes, that is, the flue gas discharged from the incinerator body passes through the urea liquid treatment unit (17) for spray cooling, the limestone foam solution unit (19), the magnesium oxide foam solution unit (20), the caustic soda foam solution unit (21), the detergent foam solution unit (22), the low-temperature plasma purification box (24) and the activated carbon filter box (25) with a flue pipe, and is finally discharged from the flue gas main outlet pipe (26).

5. A domestic waste treatment device according to claim 4, characterized in that: A high-pressure induced draft fan (18) is provided on the pipeline between the urea liquid treatment unit (17) and the limestone foam solution unit (19), and on the pipeline between the magnesium oxide foam solution unit (20) and the alkali foam solution unit (21).

6. A domestic waste treatment device according to claim 4, characterized in that: The limestone foam solution unit (19), the magnesium oxide foam solution unit (20), the caustic soda foam solution unit (21) and the detergent foam solution unit (22) are each equipped with two nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates (23). The nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates (23) are arranged transversely in the box body along the flue gas flow direction. The nickel-titanium-chromium metal catalyst turbulent stainless steel wire ball fence plates (23) are assembled from a square grid fence (231), a titanium-nickel-chromium stainless steel wire ball uniform distribution layer (232) and a stainless steel mesh plate (233). The titanium-nickel-chromium stainless steel wire ball uniform distribution layer (232) is sandwiched between the square grid fence (231) and the stainless steel mesh plate (233). The box contains urea solution, and three layers of uniform mesh plates (172) are evenly distributed from top to bottom in the box. The uniform mesh plates (172) are arranged on the cross section through which smoke passes in the urea liquid treatment unit (17). The urea solution box air intake pipe (176) passes through the three layers of uniform mesh plates (172) from top to bottom. A bottom valve (177) is provided at the bottom of the urea liquid treatment unit (17). A circulating booster pump (174) and an overflow pipe are also provided below the box of the urea liquid treatment unit (17). The circulating booster pump (174) delivers the urea solution to the atomizing nozzle (173) at the end of the pipeline through the pipeline and then sprays it onto the uniform mesh plate (172). The flue gas passes through the three layers of uniform mesh plates (172) sprayed with the urea solution in sequence and is discharged from the gas outlet (171) of the urea liquid treatment unit. The overflow pipeline (175) is externally connected to a reclaimed water storage tank for storing the overflowed mixed solution. The bottom valve (177) at the bottom of the box is used to clean and discharge the solid waste residue after neutralization and adsorption.

7. A method for treating garbage, characterized in that: Using a domestic waste treatment device as claimed in any one of claims 1 to 6 for treatment comprises the following steps: S1. The garbage to be processed is transported into two adjacent and independent furnace chambers separated inside the incinerator body by negative pressure; S2: When one furnace cavity is burning garbage, the other furnace cavity is in the state of drying and storing garbage; S3, the two furnace chambers are switched to each other; S4. The collected flue gas enters the Z-type flue gas combustion chamber and is ignited and burned by an alcohol-based fuel burner to ensure that the flue gas stays in the flue gas combustion chamber for more than 2 seconds and the combustion temperature is 850-1050 degrees; S5. The flue gas after combustion in step S4 is discharged after being subjected to multi-stage purification treatment.

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