Household garbage incineration treatment process
Through a multi-step domestic waste incineration treatment process, including incineration, extrusion, cooking and oil extraction, thermal drying, combined anaerobic treatment, sewage treatment and flue gas treatment, the problem of difficult treatment of concentrated landfill leachate has been solved, and efficient treatment and resource utilization of leachate have been achieved.
Patent Information
- Application Number
- CN202510544889.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2025-09-23
AI Technical Summary
During the incineration of domestic waste, the concentrated leachate is difficult to handle, leading to secondary environmental pollution.
A multi-step treatment process is adopted, including incineration, extrusion, cooking and oil extraction, thermal drying, combined anaerobic treatment, sewage treatment, flue gas treatment and heat energy utilization. Through technical means such as electrostatic precipitator, desulfurization, denitrification, anaerobic degradation, sewage sedimentation and heat energy recovery, domestic waste, restaurant kitchen waste, sludge and other wastes are treated in a coordinated manner to ensure that pollutants are discharged in compliance with standards.
It achieves efficient treatment of leachate, reduces environmental pollution, realizes resource utilization of waste, and ensures that pollutants are discharged in compliance with standards.
Smart Images
Figure CN120684716A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of domestic waste treatment, and in particular to a domestic waste incineration treatment process. Background Art
[0002] Municipal solid waste incineration is a technology that uses high-temperature oxidation to treat domestic waste. By burning the waste at high temperatures (typically above 850°C), it converts combustible waste into carbon dioxide and water, achieving harmlessness, waste reduction, and resource utilization. However, during incineration, concentrated leachate is difficult to handle, resulting in secondary environmental pollution. Summary of the Invention
[0003] In view of the deficiencies in the prior art, the present invention provides a domestic waste incineration treatment process, which solves the problems raised in the above background technology.
[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a domestic waste incineration treatment process, including the following contents: incineration, extrusion treatment, cooking oil extraction, brick making, landfill, thermal drying, combined anaerobic treatment, sewage treatment, flue gas treatment and heat energy utilization; The extrusion process involves putting the collected food waste into an extruder, extruding it, collecting the extruded water, and collecting the dry impurities after the water is squeezed out; The thermal drying process involves conveying the collected municipal wet sludge to a dryer, feeding the municipal wet sludge into a drum, and introducing hot air into the dryer. The hot air comes into direct contact with the sludge, and during the drying process, the lifting plate is activated to lift and sprinkle the sludge, thereby increasing the contact area between the sludge and the hot air and allowing the moisture in the sludge to evaporate quickly. After the sludge is dried, the dry sludge is taken out of the dryer. The incineration process involves crushing and sorting the collected domestic waste, and then introducing it into a three-stage mechanical reciprocating grate furnace for incineration. Dry sludge and dry kitchen waste are also introduced into the three-stage mechanical reciprocating grate furnace for incineration, producing slag, fly ash, leachate, and flue gas. During incineration, the translational grate plates produce horizontal reciprocating motion, pushing the waste layer toward the slag discharge port, and the flipping grate plates produce a turning motion. The grate plates move up and down during operation, causing the waste to be flipped in the furnace, thereby stirring the fire of the waste and allowing the primary air to fully contact the waste, thereby achieving complete combustion of the waste. The flue gas treatment is as follows: the flue gas discharged from the three-stage mechanical reciprocating grate furnace is introduced into the flue gas treatment equipment, and firstly, the dust is removed by the electrostatic precipitator, which uses a high-voltage electric field to charge the particulate matter and deposits it on the dust collecting plate under the action of the electric field force, thereby removing the particulate matter in the flue gas. The flue gas desulfurization adopts the in-furnace desulfurization technology, and the desulfurization adopts the environmentally friendly agent to be sprayed at the end of the secondary combustion chamber inside the three-stage mechanical reciprocating grate furnace, which can effectively reduce the amount of deacidification agent, desulfurize the flue gas, and use a flue gas denitrifier to treat the flue gas. The desulfurized flue gas is introduced into the flue gas denitrifier, and then a catalyst is sprayed into it. Under the action of the catalyst, a reducing agent such as ammonia or urea is used to reduce nitrogen oxides to nitrogen, thereby denitrifying the flue gas, and then the flue gas that has passed the inspection is discharged; In the combined anaerobic process, the leachate generated in the garbage bin of the three-stage mechanical reciprocating grate furnace is introduced into the anaerobic system. Anaerobic microorganisms are used to degrade organic matter under anaerobic conditions, and hydrolytic acidifying bacteria are used to decompose large molecular organic matter into small molecular fatty acids, which are then converted into methane and carbon dioxide by methanogens. Before the leachate is introduced into the anaerobic machine, a rotary grid machine is used to remove fiber materials, and a regulating tank is used to control water quality and pH value. The leachate is then heated with high-temperature flue gas. During the anaerobic treatment of the garbage leachate, the generated biogas is input into the three-stage mechanical reciprocating grate furnace for auxiliary combustion. The wastewater treatment process involves treating the dried wastewater generated by thermal sludge drying and the anaerobic treatment of the leachate. Large suspended solids in the wastewater are removed through screens, screens, and other facilities. Coagulants are added to the wastewater to condense the suspended solids into larger particles, which are then removed through a sedimentation tank. The treated wastewater is then tested and discharged after meeting the water quality standards. The pumpable portion of the concentrated liquid is sprayed back into the flue gas for drying. The non-pumpable portion of the concentrated liquid is mixed with sawdust and pushed into the garbage bin of the three-stage mechanical reciprocating grate furnace via a cart. It is then returned to the furnace for combustion and the clear liquid is reused.
[0005] Optionally, the cooking and oil extraction is used to heat the leakage liquid obtained by extrusion to a certain temperature to melt the oil and make it easy to separate, and then separate the oil from the leachate to recover the oil; the heat energy utilization is used to utilize the heat energy of the exhaust steam discharged by incineration, and refrigeration is carried out through adsorption refrigeration and absorption refrigeration equipment. The exhaust steam can also be used for heating, or the exhaust steam can be used for steam heat storage, phase change energy storage and thermochemical energy storage, and the exhaust steam can also be used to generate electricity.
[0006] Optionally, in the brick making, the slag is mixed with other materials in proportion, the ingredients are put into a mixer, and stirred thoroughly to ensure that the various materials are evenly blended, the mixed materials are poured into a brick mold, and pressed into shape with a brick press, and the prepared bricks are placed in a curing room to maintain suitable temperature and humidity until the bricks reach the required strength. The process used for the slag is primary magnetic separation + crushing + secondary magnetic separation + crushing + tertiary magnetic separation + trampoline process.
[0007] Optionally, for the landfill, the fly ash is first tested for chemical composition, and then a suitable stabilizing agent is selected for mixing. The stabilized fly ash is solidified to form a solidified body with a certain strength, and then it can be placed in an ordinary landfill or a specially designed hazardous waste landfill for zoned landfill; the fly ash adopts a chelation solidification process.
[0008] Optionally, the inner cavity of the extruder is fixedly connected to an extrusion barrel, one side of the extruder is fixedly connected to a first motor, the inside of the extrusion barrel is rotatably connected to a spiral feed shaft, the output end of the first motor is fixedly connected to one end of the spiral feed shaft, the top of the extrusion barrel is fixedly connected to a feed pipe, the bottom of the extrusion barrel is fixedly connected to a discharge pipe, the top of the feed pipe extends to the top of the extruder, and the bottom end of the discharge pipe extends to the bottom of the extruder, and several circles of filtrate structure are opened on the outside of the extrusion barrel, and each circle of filtrate structure includes several filter holes, and several of the filter holes are opened on the outside of the extrusion barrel.
[0009] Optionally, a second motor is fixedly connected to one side of the inner cavity of the extruder, and a screw is rotatably connected to the other side of the inner cavity of the extruder. The output end of the second motor is fixedly connected to one end of the screw, and a moving block is threadedly connected to the outer side of the screw, and a fixed sleeve is fixedly connected to the bottom end of the moving block. A through groove is provided inside the fixed sleeve and on the outside of the extrusion cylinder.
[0010] Optionally, a plurality of fixed cavities are provided inside the fixed sleeve, one side of the inner cavity of the fixed cavity is fixedly connected to an airbag, one end of the airbag is fixedly connected to a push block, one end of the push block is fixedly connected to a top column, and a return spring is movably provided on the outer side of the top column, one end of the return spring is fixedly connected to one side of the push block, and the other end of the return spring is fixedly connected to one side of the inner cavity of the fixed cavity, and one end of the top column extends to the inside of the through groove.
[0011] Optionally, the airbags are connected by pipes, an annular cavity is provided inside the fixed sleeve and outside the through groove, and the airbags are connected to the interior of the annular cavity through pipelines, a winding box is fixedly connected to one side of the extruder, a third motor is fixedly connected to one side of the winding box, a winding roller is rotatably connected inside the winding box, a hose is wound around the outside of the winding roller, a fixed pipe is fixedly connected inside the winding roller, one end of the hose is fixedly connected to one end of the fixed pipe, a rotary joint is provided on one side of the winding box, the other end of the fixed pipe is connected to one end of the rotary joint, the other end of the hose extends to the outside of the winding box and to the inside of the extruder, one end of the hose is fixedly connected to one side of the fixed sleeve, one end of the hose extends to the inside of the annular cavity, a pump is fixedly connected to one side of the extruder, one end of the pump is connected to the other end of the rotary joint, the output end of the third motor is fixedly connected to one end of the winding roller, a drain pipe is fixedly connected to the bottom of the extruder, and the top of the drain pipe extends to the inside of the extruder.
[0012] The present invention provides a domestic waste incineration treatment process, which has the following beneficial effects: 1. This domestic waste incineration treatment process is a new process that can collaboratively treat multiple wastes, including domestic waste, kitchen waste, medical waste, leachate, sludge and fly ash generated by incineration, while also ensuring that pollutant emissions meet standards. The leachate concentrate is evaporated by high-temperature flue gas, solving the problem of difficult treatment of leachate concentrate. The pumpable part of the concentrate is sprayed back into the flue gas for drying, and the non-pumpable part at the bottom of the concentrate is mixed with sawdust and returned to the furnace for combustion, and the clear liquid is reused.
[0013] 2. The domestic waste incineration treatment process is provided with a fixed sleeve, a fixed cavity and a top column. When the food waste inside the extrusion cylinder is squeezed and transported, the pump machine inputs gas into the rotary joint, the fixed pipe and the hose and the annular cavity, and then enters the air bag through the pipeline, so that the air bag expands and pushes the push block and the top column to move, so that the top column enters the filter hole, and pushes the blockage inside the filter hole in the several circles of filtrate structure into the extrusion cylinder, and is pushed to move by the spiral feeding shaft. Then the pump machine is started, and the gas inside the air bag is extracted through the rotary joint, the fixed pipe, the hose, the annular cavity and the pipeline, so that the air bag contracts. At this time, the return spring pushes the push block to drive the top column to return to the fixed cavity, so that one end of the top column moves out of the filter hole. Then the second motor is started, so that the moving block drives the fixed sleeve to drive the top column to move to the next working position. This reciprocating operation clears the blockage inside the filter hole outside the extrusion cylinder and ensures that the filter hole will not be blocked. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a process flow chart of the present invention; Figure 2Schematic diagram of the internal structure of the extruder of the present invention; Figure 3 This is a schematic diagram of the internal structure of the winding box of the present invention from a side view; Figure 4 For the present invention Figure 2 Enlarged view of point A.
[0015] In the figure: 1. Incineration; 2. Extrusion treatment; 3. Steaming and oil extraction; 4. Thermal drying; 5. Combined anaerobic treatment; 6. Sewage treatment; 7. Heat energy utilization; 8. Brick making; 9. Landfill; 10. Flue gas treatment; 11. Extruder; 12. Extrusion barrel; 13. Screw feed shaft; 14. First motor; 15. Filter hole; 16. Second motor; 17. Screw; 18. Moving block; 19. Fixed sleeve; 20. Through groove; 21. Fixed cavity; 22. Air bag; 23. Push block; 24. Ejector column; 25. Return spring; 26. Annular cavity; 27. Hose; 28. Winding box; 29. Third motor; 30. Winding roller; 31. Fixed pipe; 32. Rotary joint; 33. Pump; 34. Discharge pipe; 35. Feed pipe; 36. Drain pipe. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0017] Example 1 See also Figure 1 The present invention provides a technical solution: a domestic waste incineration treatment process, comprising the following contents: incineration 1, extrusion treatment 2, cooking oil extraction 3, brick making 8, landfill 9, thermal drying 4, combined anaerobic treatment 5, sewage treatment 6, flue gas treatment 10 and heat energy utilization 7; Extrusion treatment 2: putting the collected food waste into an extruder 11 for extrusion, collecting the extruded water, and collecting the dry impurities after the water is squeezed out; Thermal drying 4: The collected municipal wet sludge is transported to the dryer, fed into the drum, and hot air is fed into the dryer. The hot air comes into direct contact with the sludge, and during the drying process, the lifting plate is activated to lift and sprinkle the sludge, increasing the contact area between the sludge and the hot air, so that the water in the sludge evaporates quickly. After the sludge is dried, the dry sludge is taken out of the dryer; Incineration 1: The collected domestic waste is crushed and sorted, and then introduced into a three-stage mechanical reciprocating grate furnace for incineration. Dry sludge and dry kitchen impurities are also introduced into the three-stage mechanical reciprocating grate furnace for incineration. The incineration produces slag, fly ash, leachate and flue gas. During incineration, the translation grate pieces produce horizontal reciprocating motion, pushing the garbage layer toward the slag discharge port, and the flipping grate pieces produce a turning motion. The grate pieces produce up and down motion during operation, causing the garbage to be flipped in the furnace, realizing the garbage fire-stirring effect, so that the primary air is fully in contact with the garbage, and the garbage is completely burned; Flue gas treatment 10. The flue gas discharged from the three-stage mechanical reciprocating grate furnace is introduced into the flue gas treatment equipment. First, it is dedusted by an electrostatic precipitator. The electrostatic precipitator uses a high-voltage electric field to charge the particulate matter, and under the action of the electric field force, it is deposited on the dust collecting plate to remove the particulate matter in the flue gas. Flue gas desulfurization adopts the in-furnace desulfurization technology. The desulfurization uses environmentally friendly agents to be sprayed at the end of the secondary combustion chamber inside the three-stage mechanical reciprocating grate furnace, which can effectively reduce the amount of deacidification agents used. The flue gas is desulfurized and treated with a flue gas denitrifier. The desulfurized flue gas is introduced into the flue gas denitrifier and then a catalyst is sprayed into it. Under the action of the catalyst, a reducing agent such as ammonia or urea is used to reduce nitrogen oxides to nitrogen, thereby denitrifying the flue gas. The flue gas that has passed the inspection is then discharged. Combined anaerobic 5: The leachate generated in the garbage bin of the three-stage mechanical reciprocating grate furnace is introduced into the anaerobic system. Anaerobic microorganisms degrade organic matter under anaerobic conditions, and hydrolytic acidifying bacteria decompose large molecular organic matter into small molecular fatty acids, which are then converted into methane and carbon dioxide by methanogens. Before the leachate is introduced into the anaerobic machine, a rotary screen machine is used to remove fiber materials, and the water quality and pH value are controlled in a regulating tank. The leachate is then heated with high-temperature flue gas. During the anaerobic treatment of the garbage leachate, the generated biogas is input into the three-stage mechanical reciprocating grate furnace for auxiliary combustion. Wastewater treatment 6: The dried wastewater generated by sludge thermal drying and the leachate after anaerobic treatment are treated. Large suspended solids in the wastewater are removed through grilles, screens, and other facilities. Coagulants are added to the wastewater to agglomerate the suspended solids into larger particles, which are then removed through a sedimentation tank. The treated wastewater is then tested and discharged after meeting the water quality standards. The pumpable portion of the concentrate is sprayed back into the flue gas for drying. The non-pumpable portion of the concentrate is mixed with sawdust and pushed into the garbage bin of the three-stage mechanical reciprocating grate furnace via a cart. It is then returned to the furnace for combustion and the clear liquid is reused. Cooking and oil extraction 3 is used to heat the leachate obtained by extrusion to a certain temperature to melt the oil and fat and facilitate separation, and then separate the oil and fat from the leachate and recover the oil and fat; heat energy utilization 7 is used to utilize the heat energy of the exhaust steam discharged from the incineration 1, and to cool the exhaust steam through adsorption refrigeration and absorption refrigeration equipment, or to provide heat through the exhaust steam, or to store the exhaust steam through steam heat, phase change energy storage, thermochemical energy storage, or to generate electricity; Brick making 8: Mix the slag with other materials in proportion, put the ingredients into a mixer, stir them thoroughly to ensure that the various materials are evenly blended, pour the mixed materials into a brick mold, press them into shape with a brick press, and place the finished bricks in a curing room to maintain appropriate temperature and humidity until the bricks reach the required strength. The process used for the slag is primary magnetic separation + crushing + secondary magnetic separation + crushing + tertiary magnetic separation + trampoline process; Landfill 9. First, the chemical composition of the fly ash is tested, and then a suitable stabilizing agent is selected for mixing. The stabilized fly ash is solidified to form a solidified body with a certain strength. It can then be placed in an ordinary landfill or a specially designed hazardous waste landfill for zoned landfill. The fly ash adopts a chelation solidification process.
[0018] Example 2 See also Figures 1 to 4 The present invention provides a technical solution: an extrusion barrel 12 is fixedly connected to the inner cavity of the extruder 11, a first motor 14 is fixedly connected to one side of the extruder 11, a spiral feed shaft 13 is rotatably connected to the inside of the extrusion barrel 12, the output end of the first motor 14 is fixedly connected to one end of the spiral feed shaft 13, a feed pipe 35 is fixedly connected to the top of the extrusion barrel 12, a discharge pipe 34 is fixedly connected to the bottom of the extrusion barrel 12, the top of the feed pipe 35 extends to the top of the extruder 11, and the bottom end of the discharge pipe 34 extends to the bottom of the extruder 11, and a plurality of circles of filtrate structures are provided on the outside of the extrusion barrel 12, and each circle of filtrate structure includes a plurality of filter holes 15, and the plurality of filter holes 15 are all provided on the outside of the extrusion barrel 12, and the moisture squeezed out of the kitchen waste moving inside the extrusion barrel 12 is discharged through the filter holes 15.
[0019] Among them, a second motor 16 is fixedly connected to one side of the inner cavity of the extruder 11, and a screw rod 17 is rotatably connected to the other side of the inner cavity of the extruder 11. The output end of the second motor 16 is fixedly connected to one end of the screw rod 17, and the outer side of the screw rod 17 is threadedly connected to a moving block 18. The bottom end of the moving block 18 is fixedly connected to a fixed sleeve 19. A through groove 20 is provided inside the fixed sleeve 19 and on the outside of the extrusion cylinder 12, so that the fixed sleeve 19 can move along the outside of the extrusion cylinder 12.
[0020] Among them, several fixed cavities 21 are opened inside the fixed sleeve 19, and one side of the inner cavity of the fixed cavity 21 is fixedly connected with an air bag 22, one end of the air bag 22 is fixedly connected with a push block 23, one end of the push block 23 is fixedly connected with a top column 24, and the outer side of the top column 24 is movably sleeved with a return spring 25, one end of the return spring 25 is fixedly connected to one side of the push block 23, and the other end of the return spring 25 is fixedly connected to one side of the inner cavity of the fixed cavity 21, and one end of the top column 24 extends to the inside of the through groove 20. The blockage inside the filter hole 15 in several circles of filtrate structure can be cleaned through the top column 24.
[0021] Among them, the airbags 22 are connected by pipes, an annular cavity 26 is opened inside the fixed sleeve 19 and on the outside of the through groove 20, and the airbags 22 are connected to the inside of the annular cavity 26 through the pipeline. A winding box 28 is fixedly connected to one side of the extruder 11, and a third motor 29 is fixedly connected to one side of the winding box 28. A winding roller 30 is rotatably connected inside the winding box 28, and a hose 27 is wound around the outside of the winding roller 30. A fixed tube 31 is fixedly connected inside the winding roller 30, and one end of the hose 27 is fixedly connected to one end of the fixed tube 31. A rotary joint 32 is provided on one side of the winding box 28, and the other end of the fixed tube 31 is connected to one end of the rotary joint 32. The other end of the hose 27 extends to the outside of the winding box 28 and extends to the inside of the extruder 11, and one end of the hose 27 is fixedly connected to one side of the fixed sleeve 19. One end of the hose 27 extends into the inside of the annular cavity 26, and a pump 33 is fixedly connected to one side of the extruder 11. One end of the pump 33 is connected to the other end of the rotary joint 32, and the output end of the third motor 29 is fixedly connected to one end of the winding roller 30. The bottom of the extruder 11 is fixedly connected to a drain pipe 36, and the top of the drain pipe 36 extends into the inside of the extruder 11. As the moving block 18 drives the fixed sleeve 19 to move, the winding roller 30 is driven to rotate by the output end of the third motor 29, so that the winding roller 30 reels the hose 27, and the winding roller 30 is driven to reset and rotate by the output end of the third motor 29, so that the hose 27 is released from the outside of the winding roller 30, so that the moving block 18 can drive the fixed sleeve 19, the fixed cavity 21, the airbag 22, the push block 23, the reset spring 25, the through groove 20 and the top column 24 to move.
[0022] In summary, when the domestic waste incineration treatment process is used, the food waste is poured into the feed pipe 35, and enters the extrusion cylinder 12 through the feed pipe 35. Then, the output end of the first motor 14 drives the spiral feed shaft 13 to rotate, so that the spiral feed shaft 13 drives the food waste inside the extrusion cylinder 12 to move, and while moving the food waste, the food waste inside the extrusion cylinder 12 is squeezed, and the water in the food waste is squeezed out through the filter hole 15, and then falls into the extruder 11 through the filter hole 15, and then is discharged through the drain pipe 36. The kitchen waste from which water has been squeezed out is then pushed into the discharge pipe 34 and then discharged through the discharge pipe 34. When the kitchen waste inside the extrusion cylinder 12 is extruded and transported, gas is input into the rotary joint 32, the fixed pipe 31, the hose 27 and the annular cavity 26 through the pump 33, and then enters the air bag 22 through the pipeline, so that the air bag 22 expands and pushes the push block 23 and the top column 24 to move, so that the top column 24 enters the filter hole 15, and the blockage inside the filter hole 15 in the several circles of filtrate structure is pushed out to the extrusion cylinder 12. Inside, it is pushed and moved by the spiral feed shaft 13, and then the pump 33 is started, and the gas inside the airbag 22 is extracted through the rotary joint 32, the fixed tube 31, the hose 27, the annular cavity 26 and the pipeline, so that the airbag 22 shrinks. At this time, the return spring 25 pushes the push block 23 to drive the top column 24 to return to the inside of the fixed cavity 21, so that one end of the top column 24 moves out of the filter hole 15, and then the output end of the second motor 16 drives the screw rod 17 to rotate, so that the screw rod 17 drives the moving block 18 to drive the fixed sleeve 19 and the fixed cavity 21, the airbag 22, the push block 23 moves with the return spring 25 and the top column 24 to move the fixed sleeve 19 to the outside of the remaining filtrate structure, and push out the blockage inside the filter hole 15 in the several circles of filtrate structure inside the fixed sleeve 19, and so on. After the moving block 18 drives the fixed sleeve 19 to move to the rightmost end, the output end of the second motor 16 drives the screw rod 17 to reset and rotate, so that the screw rod 17 drives the moving block 18 to drive the fixed sleeve 19, the through groove 20, the fixed cavity 21, the airbag 22, the pushing block 23, the return spring 25 and the top column 24 to reset and move, and so on.
[0023] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A domestic waste incineration process, characterized by: Includes the following: Incineration (1), extrusion (2), cooking and oil extraction (3), brick making (8), landfill (9), thermal drying (4), combined anaerobic treatment (5), sewage treatment (6), flue gas treatment (10) and heat energy utilization (7); The extrusion process (2) is to put the collected food waste into an extruder (11), perform extrusion, collect the extruded water, and collect the dry impurities after the water is squeezed out; The thermal drying (4) is to transport the collected municipal wet sludge to a dryer, input the municipal wet sludge into a drum, input hot air into the dryer, and the hot air directly contacts the sludge. During the drying process, the lifting plate is started to lift and sprinkle the sludge, thereby increasing the contact area between the sludge and the hot air, so that the water in the sludge evaporates quickly. After the sludge is dried, the dry sludge is taken out of the dryer; The incineration (1) crushes and sorts the collected domestic waste, and then introduces it into a three-stage mechanical reciprocating grate furnace for incineration, and also introduces dry sludge and dry kitchen impurities into the three-stage mechanical reciprocating grate furnace for incineration, and the incineration produces slag, fly ash, leachate and flue gas. During incineration, the translation grate pieces produce horizontal reciprocating motion, pushing the garbage layer to move toward the slag discharge port, and the flipping grate pieces produce flipping motion. The grate pieces produce up and down motion when in action, causing the garbage to flip in the furnace, achieving the fire-stirring effect of the garbage, so that the primary air is fully in contact with the garbage, and the garbage is completely burned; The flue gas treatment (10) is as follows: the flue gas discharged from the three-stage mechanical reciprocating grate furnace is introduced into the flue gas treatment equipment, and firstly, dust is removed by an electrostatic precipitator, which uses a high-voltage electric field to charge the particulate matter and deposits it on the dust collecting plate under the action of the electric field force, thereby removing the particulate matter in the flue gas. The flue gas desulfurization adopts the furnace desulfurization technology, and the desulfurization adopts the environmentally friendly agent to be sprayed at the end of the secondary combustion chamber inside the three-stage mechanical reciprocating grate furnace, which can effectively reduce the amount of deacidification agent, and desulfurize the flue gas. The flue gas is treated with a flue gas denitrifier, and the desulfurized flue gas is introduced into the flue gas denitrifier, and then a catalyst is sprayed into the flue gas denitrifier. Under the action of the catalyst, a reducing agent such as ammonia or urea is used to reduce nitrogen oxides to nitrogen, thereby denitrifying the flue gas, and then the flue gas that has passed the inspection is discharged; In the combined anaerobic (5), the leachate generated in the garbage bin of the three-stage mechanical reciprocating grate furnace is introduced into the anaerobic system, and the organic matter is degraded by anaerobic microorganisms under anaerobic conditions, and the macromolecular organic matter is decomposed into small molecular fatty acids by hydrolytic acidifying bacteria, and then converted into methane and carbon dioxide by methanogens. Before the leachate is introduced into the anaerobic machine, a rotary grid machine is used to remove fiber materials, and the water quality and pH value are controlled by a regulating tank. Then, the leachate is heated by high-temperature flue gas. When the garbage leachate is anaerobic treated, the generated biogas is input into the three-stage mechanical reciprocating grate furnace for auxiliary combustion. The sewage treatment (6) is to treat the dried wastewater generated by the thermal drying of the sludge and the wastewater after the anaerobic treatment of the leachate, remove the large suspended particles in the wastewater through facilities such as grids and screens, add a coagulant to the wastewater to make the suspended particles condense into larger particles, and then remove them through a sedimentation tank, and then test the treated sewage. After the water quality meets the standard, it is discharged, and the pumpable part of the concentrated liquid is sprayed back into the flue gas for drying, and the non-pumpable part of the concentrated liquid at the bottom is mixed with sawdust and pushed into the garbage bin of the three-stage mechanical reciprocating grate furnace by a cart, and returned to the furnace for combustion, and the clear liquid is reused.
2. A domestic waste incineration process according to claim 1, characterized in that: The cooking and oil extraction (3) is used to heat the leakage liquid obtained by extrusion to a certain temperature so that the oil is melted and easy to separate, and then the oil is separated from the leachate to recover the oil; the heat energy utilization (7) is used to utilize the heat energy of the exhaust steam discharged from the incineration (1), and refrigeration is performed through adsorption refrigeration and absorption refrigeration equipment, and heat can also be supplied through the exhaust steam, and steam heat storage, phase change energy storage and thermochemical energy storage can also be performed on the exhaust steam, and the exhaust steam can also be used to generate electricity.
3. A domestic waste incineration process according to claim 1, characterized in that: The brick making (8) comprises mixing the slag with other materials in proportion, placing the ingredients in a mixer, and stirring them thoroughly to ensure that the various materials are evenly blended. The stirred materials are poured into a brick mold, and pressed into shape using a brick press. The prepared bricks are placed in a curing room and maintained at a suitable temperature and humidity until the bricks reach the required strength. The process used for the slag is a primary magnetic separation + crushing + secondary magnetic separation + crushing + tertiary magnetic separation + trampoline process.
4. A domestic waste incineration process according to claim 1, characterized in that: The landfill (9) is to first detect the chemical composition of the fly ash, then select a suitable stabilizing agent for mixing, solidify the stabilized fly ash to form a solidified body with a certain strength, and then enter a common landfill or a specially designed hazardous waste landfill for zoned landfill; the fly ash adopts a chelation solidification process.
5. The domestic waste incineration process according to claim 1, characterized in that: The inner cavity of the extruder (11) is fixedly connected to an extrusion barrel (12), one side of the extruder (11) is fixedly connected to a first motor (14), the interior of the extrusion barrel (12) is rotatably connected to a spiral feed shaft (13), the output end of the first motor (14) is fixedly connected to one end of the spiral feed shaft (13), the top of the extrusion barrel (12) is fixedly connected to a feed pipe (35), the bottom of the extrusion barrel (12) is fixedly connected to a discharge pipe (34), the top end of the feed pipe (35) extends to the top of the extruder (11), the bottom end of the discharge pipe (34) extends to the bottom of the extruder (11), the outer side of the extrusion barrel (12) is provided with a plurality of filtrate structures, and each filtrate structure includes a plurality of filter holes (15), and the plurality of filter holes (15) are all provided on the outer side of the extrusion barrel (12).
6. A domestic waste incineration process according to claim 5, characterized in that: A second motor (16) is fixedly connected to one side of the inner cavity of the extruder (11), and a screw rod (17) is rotatably connected to the other side of the inner cavity of the extruder (11). The output end of the second motor (16) is fixedly connected to one end of the screw rod (17). The outer side of the screw rod (17) is threadedly connected to a moving block (18). The bottom end of the moving block (18) is fixedly connected to a fixed sleeve (19). A through groove (20) is provided inside the fixed sleeve (19) and on the outer side of the extrusion cylinder (12).
7. A domestic waste incineration process according to claim 6, characterized in that: A plurality of fixed cavities (21) are provided inside the fixed sleeve (19), one side of the inner cavity of the fixed cavity (21) is fixedly connected to an air bag (22), one end of the air bag (22) is fixedly connected to a push block (23), one end of the push block (23) is fixedly connected to a top column (24), and a return spring (25) is movably provided on the outer side of the top column (24), one end of the return spring (25) is fixedly connected to one side of the push block (23), and the other end of the return spring (25) is fixedly connected to one side of the inner cavity of the fixed cavity (21), and one end of the top column (24) extends to the inside of the through groove (20).
8. A domestic waste incineration process according to claim 7, characterized in that: The airbags (22) are all connected to each other through pipelines. An annular cavity (26) is provided inside the fixed sleeve (19) and outside the through groove (20). The airbags (22) are all connected to the inside of the annular cavity (26) through the pipeline. A winding box (28) is fixedly connected to one side of the extruder (11). A third motor (29) is fixedly connected to one side of the winding box (28). A winding roller (30) is rotatably connected inside the winding box (28). A hose (27) is wound around the outside of the winding roller (30). A fixed tube (31) is fixedly connected inside the winding roller (30). One end of the hose (27) is fixedly connected to one end of the fixed tube (31). A rotary joint (32) is provided on one side of the winding box (28). The other end of the fixed tube (31) is connected to one end of the rotary joint (32), the other end of the hose (27) extends to the outside of the winding box (28) and extends to the inside of the extruder (11), one end of the hose (27) is fixedly connected to one side of the fixed sleeve (19), one end of the hose (27) extends to the inside of the annular cavity (26), one side of the extruder (11) is fixedly connected to a pump (33), one end of the pump (33) is connected to the other end of the rotary joint (32), the output end of the third motor (29) is fixedly connected to one end of the winding roller (30), the bottom of the extruder (11) is fixedly connected to a drain pipe (36), the top of the drain pipe (36) extends to the inside of the extruder (11).