CN111408601A - A kind of kitchen waste resource utilization method and treatment system - Google Patents

Abstract

A resource utilization method of kitchen waste comprises the following steps: 1) carrying out hydraulic cleaning and preliminary separation on the kitchen waste; 2) separating out waste metal, waste plastic, bone, glass and ceramic from the separated slag; processing bones into bone powder, packaging and selling waste plastics, crushing, dehydrating and drying the residual food slag, and then carrying out dry distillation; 3) the separated liquid is further separated into biological grease, fine slag and sewage; storing biological grease, performing dry distillation on fine slag materials to convert the fine slag materials into biological carbon, and desulfurizing biogas generated after anaerobic treatment of sewage to serve as fuel of a dry distillation unit; 4) drying the biogas residues and then carrying out dry distillation; 5) condensing the dry distillation gas generated in the dry distillation process to separate out combustible gas as fuel of a dry distillation unit, and carrying out oil-water separation on the residual liquid to generate biomass oil and pyroligneous liquor. The invention also discloses a system for realizing the method.

Description

A kind of kitchen waste resource utilization method and treatment system

technical field

The invention belongs to the field of environmental protection, and in particular relates to a method for recycling kitchen waste.

The invention also relates to a processing system for implementing the above method.

Background technique

Kitchen waste, commonly known as swill, is a domestic waste formed by residents in the process of living and consumption. It is extremely perishable and deteriorated, emits stench, and spreads bacteria and viruses.

The main components of food waste include food residues, vegetables, animal and vegetable oils, meat and bones, etc. From the chemical composition, there are starch, cellulose, protein, lipids and inorganic salts. The main characteristics of kitchen waste are that it is rich in organic matter, high in moisture content, and perishable. Its properties and odor will have a bad impact on environmental hygiene, and it is easy to grow bacteria, microorganisms, mycotoxins and other harmful substances.

Food waste pollutes the environment, endangers human health, spreads diseases, and the seepage liquid generated when the food waste is stacked enters the sewage treatment system, which will increase the content of organic matter, thereby increasing the burden on sewage treatment plants and increasing operating costs.

Nutrient-rich kitchen waste is a valuable renewable resource, but because it has not been paid attention to, it is usually treated by landfill and other methods.

At present, the main treatment methods of kitchen waste include landfill, composting, incineration, and crushing and direct discharge. The landfill method covers a large area, and also produces pollutants such as CH ₄ and leachate; the composting treatment cycle is long, NH ₃ and greenhouse gases are produced, and the quality of the fertilizer is not high, so it is difficult to popularize; the moisture content of kitchen waste When it is incinerated together with other household wastes, toxic dioxin gas will be produced; while crushing and direct discharge will easily produce sewage and odor, which will breed bacteria, mosquitoes and flies.

Most of the kitchen waste treatment in the prior art adopts the method of cutting and crushing and directly discharging it to the sewers, which not only still causes environmental pollution but also increases the burden of sewage treatment in the urban pipe network. The technology of turning food waste into treasure, the patent ZL201711199255.5 "a food waste treatment device" solves these problems very well The kitchen waste is separated from solid-liquid and oil-water. After the solid-liquid separation, the solid kitchen waste is packaged and collected. The liquid after solid-liquid separation is separated from oil and water, and kitchen waste oil is extracted and collected, which is supplied to chemical plants as raw materials for industrial products or for comprehensive utilization of biomass diesel, and the harmless waste water is directly discharged.

However, for some specific places or the material products of kitchen waste treated with different components and different requirements, the treatment methods of the existing technologies require diversified innovative solutions. The existing technologies such as the patent ZL201711199255.5 "A Kitchen Waste Treatment Device" , which belongs to a simple extrusion method to realize solid-liquid separation of kitchen waste by extrusion, and the separated solid substances are packaged and transported for utilization. After waste treatment, it is powerless to cut and pulverize to produce granular food waste treatment materials. The key to the problem is that it cannot be directly discharged after crushing and cutting, and it should be fully utilized. The method and treatment equipment that can maintain the physical and chemical properties of solid substances in the solid-liquid mixture and can cut and pulverize the solidified particles of the food waste with special needs and can realize the utilization of resources are particularly necessary.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for resource utilization of kitchen waste.

Another object of the present invention is to provide a processing system for implementing the above method.

In order to achieve the above-mentioned purpose, in the method for resource utilization of kitchen waste provided by the present invention, the main steps are:

1) Water cleaning and preliminary separation of kitchen waste;

2) Scrap metal, waste plastic, bone, glass, and ceramics are selected from the separated slag; the bone is processed into bone meal for sale, and the waste plastic is packaged and sold, and the remaining food slag is pulverized, dehydrated, and dried for dry distillation;

3) The separated liquid is further separated into biological oil, fine slag and sewage; the biological oil is stored, the fine slag is converted into biochar by dry distillation, and the biogas generated after the anaerobic treatment of sewage is desulfurized as the fuel of the dry distillation unit. ;

4) dry distillation of biogas residue after drying;

5) The dry distillation pyrolysis gas produced in the dry distillation process is condensed and separated into combustible gas as the fuel for the dry distillation unit, and the remaining liquid is separated into biomass oil and wood vinegar by oil and water.

In the method for recycling kitchen waste, wherein the slag in step 2 is sorted by photoelectricity, eddy current and electromagnetic.

In the method for resource utilization of kitchen waste, wherein the sewage separated in step 3 is subjected to anaerobic treatment, aerobic treatment and adsorption treatment.

In the method for recycling kitchen waste, step 4 is to dry the biogas residue with a moisture content of 80% to a moisture content of less than 30%.

The processing system for realizing the above-mentioned method for recycling kitchen waste provided by the present invention includes:

1) The pretreatment workshop with a high-level dumping platform is transported to the disposal site by vehicles that collect and transport kitchen waste, and then dumped into the hopper through the high-level dumping platform;

2) Drum screen, which is used to transport the kitchen waste in the hopper for hydraulic cleaning and preliminary separation;

3) Photoelectric, eddy current and electromagnetic sorting devices are used to further sort scrap metal, scrap plastic, bone, glass and ceramics from the initially separated slag;

4) Bone crusher, which is used to process the bones separated by photoelectric, eddy current and electromagnetic sorting devices into bone meal and pack them;

5) A slag pulverizer, a dehydrator and a dryer, which are used to pulverize, dehydrate and dry the food slag separated by the photoelectric, eddy current and electromagnetic sorting devices and then enter the dry distillation device;

6) The rotary drum screen is connected to the rotating fine grid, the grease trap and the three-phase centrifuge, and the liquid screened by the rotary drum screen is further separated into biological oil, wood vinegar, fine slag and sewage; the biological oil enters the storage tank. The oil tank is stored, the wood vinegar liquid is sent to the wood vinegar liquid tank for storage, and the fine slag material enters the dry distillation device after drying;

7) Anaerobic feed tank and anaerobic reactor are used for anaerobic treatment of sewage produced in the whole process, and the biogas produced after treatment is desulfurized as fuel for dry distillation unit;

8) Aerobic processor, magnetic flocculation processor, active coke filtration and adsorption deep processor, reverse osmosis processor, which are used to perform aerobic treatment, magnetic flocculation treatment, active coke filtration and adsorption after the submersible treated by the anaerobic reactor Discharge up to standard after deep treatment and reverse osmosis treatment;

9) Intermediate silo, conveying device and dry distillation device for dry distillation of the dried biogas residue;

10) Biochar silo, used to store the biochar converted into after dry distillation;

11) Dry distillation pyrolysis gas treatment device, which is used to recover the combustible gas and pyrolysis liquid in the pyrolysis gas generated in the dry distillation process of the kitchen waste through the condensate spray tank and the gas treatment box, and the combustible gas is transported To the dry distillation unit as fuel, the pyrolysis liquid is transported to the pyrolysis liquid tank;

The dry distillation pyrolysis gas treatment device includes: dry distillation device, pyrolysis liquid spray tank, gas treatment box, safety water tank, pyrolysis liquid tank, cooling circulating water tank, induced draft fan, pyrolysis liquid spray tank air inlet, hoisting hole, Inspection port, cooling water pipe, pyrolysis liquid spray pipe, pyrolysis liquid spray tank drain pipe, cooling water outlet pipe, cooling water inlet pipe, gas treatment tank drain pipe, box body, pyrolysis liquid tank inlet, heat Solution delivery pump, pyrolysis solution overflow pipe, pyrolysis solution settling tank, return pipe of cooling circulating water tank, cooling water circulating pump, combustible gas outlet, explosion vent, inspection port, overflow port, sewage pipe, water supply pipe, safety Water tank air inlet, second connection pipe, gas treatment box vent, gas treatment box air inlet, first connection pipe, pyrolysis liquid spray pipe inlet, pyrolysis gas outlet of dry distillation device and pyrolysis liquid spray Shower tank vent.

The treatment system, wherein the pyrolysis gas generated by the dry distillation device in the process of processing the kitchen waste is fed into the pyrolysis liquid spray tank and the gas treatment box in turn by the action of the induced draft fan; It is discharged from the combustible gas outlet of the gas treatment tank; the pyrolysis liquid is transported to the pyrolysis liquid tank through the pipeline from the discharge port of the pyrolysis liquid spray tank and the liquid discharge pipe of the gas treatment tank; the pyrolysis liquid in the pyrolysis liquid tank passes through the The pyrolysis solution pump is transported to the pyrolysis solution spray pipe of the pyrolysis solution spray tank.

The treatment system, wherein the pyrolysis liquid spray tank is composed of a tank body, a pyrolysis liquid spray pipe, an air inlet of the pyrolysis liquid spray tank, an air outlet of the pyrolysis liquid spray tank, and a pyrolysis liquid spray tank. It is composed of a liquid drain pipe, an inspection port, etc.; the pyrolysis gas first enters the pyrolysis liquid spray tank from the pyrolysis gas outlet of the dry distillation device of the dry distillation device, and enters the pyrolysis liquid spray tank through the air inlet of the pyrolysis liquid spray tank, and the pyrolysis gas passes through the pyrolysis liquid spray tank. After the spray tank treatment, the pyrolysis liquid is discharged from the drain pipe of the pyrolysis liquid spray tank at the bottom of the pyrolysis liquid spray tank and transported to the pyrolysis liquid tank, and the pyrolysis gas is sprayed by the pyrolysis liquid at the top of the pyrolysis liquid spray tank. The air outlet of the shower tank is transported to the air inlet of the gas treatment box through the first connecting pipe and enters the gas treatment box.

The treatment system, wherein the gas treatment box is composed of a cooling water pipe, an air inlet of the gas treatment box, a combustible gas outlet, an explosion vent of the gas treatment box, a second connecting pipe, a cooling water outlet pipe, a cooling water inlet pipe, and a gas treatment box. The cooling water inlet pipe is connected to the cooling circulating water tank through the cooling water circulating pump; the cooling water pipe is connected to the cooling circulating water tank return pipe of the cooling circulating water tank through the cooling water outlet pipe; The second connecting pipe is connected to the safety water tank air inlet of the safety water tank; the combustible gas generated by the pyrolysis gas after being processed by the gas treatment box is discharged through the combustible gas outlet on the upper part of the gas treatment box as fuel for recycling; the pyrolysis gas passes through the gas treatment box The pyrolyzed liquid produced after treatment is transported to the pyrolyzed liquid tank through the gas treatment tank drain pipe at the lower part of the gas treatment tank.

The treatment system, wherein the safety water tank is composed of a box body, an air inlet of the safety water tank, an explosion vent, a water supply pipe, an overflow port, a sewage pipe and an inspection port; the water level in the safety water tank is 85% of the height of the safety water tank , the air intake pipe of the safety water tank is connected to the explosion vent of the gas treatment box and the explosion vent of the pyrolysis liquid spray tank through the second connecting pipe. When the flammable gas in the liquid spray tank or gas treatment box is tempered and deflagrated, the gas generated by the deflagration enters the safety water tank through the second connecting pipe through the explosion vent of the pyrolysis liquid spray tank or the explosion vent of the gas treatment box. Under the action of the instantaneous pressure of the gas, the water in the safety water tank is discharged through the explosion vent of the safety water tank; after the pressure generated by the explosion gas is discharged through the explosion vent of the safety water tank, the safety water tank will pass the water supply pipe to the safety water tank. The water level returns to its original level.

The characteristics of the present invention are:

1) It can classify, decompose and recycle various substances in kitchen waste to the maximum extent, and fully convert all kinds of substances into resources that can be reused. Using kitchen waste as raw material, the following products are produced and recycled: bone meal, waste plastic, scrap metal, biomass oil, pyrolysis liquid, biochar, biogas, etc.

2. Through the sale of the above-mentioned renewable resource products, the economic benefit of the enterprise can be improved, so that the enterprise can stabilize production and operation, and at the same time increase the taxation of the local government and reduce the financial burden.

3) There is no need for too many special new equipment, and various well-known equipments are used to cooperate with each other to complete the treatment of kitchen waste recycling.

Description of drawings

FIG. 1 is a schematic flow chart of the resource utilization of kitchen waste according to the present invention.

Fig. 2 is a side view of the pyrolysis gas treatment device of the present invention.

Fig. 3 is a plan view of the pyrolysis gas treatment device of the present invention.

Description of the symbols in the drawings

1 Dry distillation unit, 2 Pyrolysis liquid spray tank, 3 Gas treatment tank, 4 Safety water tank, 5 Pyrolysis liquid tank, 6 Cooling circulating water tank, 7 Induced draft fan, 8 Pyrolysis liquid spray tank inlet, 9 Lifting port , 10 inspection ports, 11 cooling water pipes, 12 pyrolysis liquid spray pipes, 13 pyrolysis liquid spray tank drain pipes, 14 cooling water outlet pipes, 15 cooling water inlet pipes, 16 gas treatment tank drain pipes, 17 boxes body, 18 inlet of pyrolysis liquid tank, 19 pyrolysis liquid delivery pump, 20 pyrolysis liquid overflow pipe, 21 pyrolysis liquid sedimentation tank, 22 return port of cooling circulating water tank, 23 cooling water circulating pump, 24 combustible gas outlet, 25 drain Explosion port, 26 inspection port, 27 overflow port, 28 drain pipe, 29 water supply pipe, 30 safety water tank air inlet, 31 second connecting pipe, 32 gas treatment box explosion vent, 33 gas treatment box air inlet, 34 The first connecting pipe, 35 the gas outlet of the pyrolysis liquid spray tank, 36 the pyrolysis gas outlet of the dry distillation device, and 37 the explosion vent of the pyrolysis liquid spray tank.

Detailed ways

The present invention is further described above with reference to the accompanying drawings.

As shown in Figure 1, the main steps of the present invention are:

1) After the kitchen waste is transported to the treatment site by the collection and transportation vehicle, it is dumped into the hopper through the high-level dumping platform of the pretreatment workshop;

2) The kitchen waste in the hopper is transported by the shaftless screw conveying equipment to the subsequent drum screen for hydraulic cleaning and preliminary separation;

3) The separated slag is subjected to magnetic separation, eddy current separation and photoelectric separation to select waste metal, waste plastic, bone, glass, ceramics, etc.; The balers are packaged for sale, glass ceramics are processed into grass-planting bricks, the scrap metal is recycled separately, and the remaining food residues are crushed, dehydrated, and dried before entering the dry distillation device;

4) The liquid screened by the rotary drum screen is further separated into biological oil, fine slag and sewage through the rotating fine grid, grease trap, and three-phase centrifuge; the biological oil is stored in the oil storage tank, and the fine slag is dried and then enters the Dry distillation device;

5) The sewage generated in the whole treatment process enters the anaerobic reaction tank and the anaerobic reactor, and the biogas generated after the anaerobic treatment is desulfurized as the fuel for the dry distillation unit;

6) After the sewage is treated by the anaerobic reactor, it is discharged up to the standard after aerobic treatment, magnetic flocculation treatment, active coke filtration and adsorption deep treatment, and reverse osmosis treatment;

7) The moisture content of 80% of the biogas residue is reduced to 30% after drying, and enters the dry distillation device through the intermediate silo and conveying device;

8) The slag separated from the kitchen waste and the organic matter in the biogas residue are converted into biochar after high temperature dry distillation in the dry distillation unit, and the biochar is cooled by the cooling device and then transported to the biochar bin;

9) The pyrolysis gas generated in the dry distillation process is separated into combustible gas through the dry distillation pyrolysis gas treatment device, and the combustible gas is transported to the dry distillation unit as fuel; the remaining liquid is separated by an oil-water separator and a three-phase centrifuge to separate biomass oil and pyrolysis liquid, They are respectively sent to the oil storage tank and the pyrolysis liquid tank for storage.

Since pyrolysis gas will be generated during the dry distillation of kitchen waste, and the pyrolysis gas contains pyrolysis liquid and combustible gas, how to separate and recover the pyrolysis liquid and combustible gas in the pyrolysis gas is a difficult problem in the dry distillation treatment of kitchen waste. , the shortcomings of the traditional method are:

1. The condensing equipment is blocked by dust;

2. Spraying will produce a large amount of sewage, and the pyrolysis liquid cannot be recovered;

3. The pyrolysis gas treatment equipment has the risk of flashback and explosion.

In order to ensure the safe and stable operation of the organic waste pyrolysis equipment, the present invention solves the problems of blockage of the condensation equipment, generation of sewage, unrecoverable pyrolysis liquid, tempering explosion and the like in the process of dry distillation pyrolysis gas treatment in the implementation of the recycling treatment of kitchen waste. Disclosed is a dry distillation pyrolysis gas processing device, which is used to recover the combustible gas and pyrolysis liquid in the pyrolysis gas generated in the dry distillation process of the kitchen waste after being treated by a condensate spray tank and a gas treatment box, wherein the The gas is sent to the dry distillation unit as fuel, and the pyrolysis liquid is sent to the pyrolysis liquid tank.

2 and 3, the dry distillation pyrolysis gas treatment device of the present invention includes: a dry distillation device 1, a pyrolysis liquid spray tank 2, a gas treatment tank 3, a safety water tank 4, a pyrolysis liquid tank 5, a cooling Circulating water tank 6, induced draft fan 7, air inlet of pyrolysis liquid spray tank 8, hoisting hole 9, inspection port 10, cooling water pipe 11, pyrolysis liquid spray pipe 12, pyrolysis liquid spray tank drain pipe 13, Cooling water outlet pipe 14, cooling water inlet pipe 15, gas treatment tank drain pipe 16, box body 17, pyrolysis liquid tank inlet 18, pyrolysis liquid delivery pump 19, pyrolysis liquid overflow pipe 20, pyrolysis liquid sedimentation Pool 21, cooling circulating water tank return pipe 22, cooling water circulating pump 23, combustible gas outlet 24, explosion vent 25, inspection port 26, overflow port 27, sewage pipe 28, water supply pipe 29, safety water tank air inlet 30, Two connecting pipes 31, the gas treatment box vent 32, the gas treatment box air inlet 33, the first connecting pipe 34, the pyrolysis liquid spray pipe inlet 35, the pyrolysis gas outlet 36 of the dry distillation device and the pyrolysis liquid spray The shower tank is composed of 37 explosion vents.

The pyrolysis gas generated by the dry distillation device 1 in the process of treating the kitchen waste is fed into the pyrolysis liquid spray tank 2 and the gas treatment box 3 in turn by the action of the induced draft fan 7; The combustible gas outlet 24 of 3 is discharged; the pyrolysis liquid is transported to the pyrolysis liquid tank 5 through the pipeline from the discharge port 13 of the pyrolysis liquid spray tank and the liquid discharge pipe 16 of the gas treatment tank; the pyrolysis liquid in the pyrolysis liquid tank 5 The pyrolysis liquid spray pipe 12 is delivered to the pyrolysis liquid spray tank 2 by the pyrolysis liquid delivery pump 19

The pyrolysis liquid spray tank 2 is composed of a tank body, a pyrolysis liquid spray pipe 12, an air inlet 8 of the pyrolysis liquid spray tank, an air outlet 35 of the pyrolysis liquid spray tank, and a discharge pipe 13 of the pyrolysis liquid spray tank , The maintenance port is composed of 10. The pyrolysis gas first enters the tank body of the pyrolysis liquid spray tank 2 through the pyrolysis gas outlet 36 of the dry distillation device of the pyrolysis device 1, and enters the tank body of the pyrolysis liquid spray tank 2 through the pyrolysis liquid spray tank air inlet 8 of the pyrolysis liquid spray pipe 12. After the gas is treated by the pyrolysis liquid spray tank 2, the pyrolysis liquid is discharged from the pyrolysis liquid spray tank drain pipe 13 at the bottom of the pyrolysis liquid spray tank 2 and transported to the pyrolysis liquid tank 5, and the pyrolysis gas is discharged by the pyrolysis liquid spray tank 5. The gas outlet 35 of the pyrolysis liquid spray tank on the top of the liquid spray tank 2 is transported to the gas treatment box air inlet 33 of the gas treatment box 3 through the first connecting pipe 34 and enters the gas treatment box 3 .

The gas treatment box 3 is composed of a cooling water pipe 11, an air inlet 33 of the gas treatment box, a combustible gas outlet 24, a gas treatment box explosion vent 32, a second connecting pipe 31, a cooling water pipe 11, a cooling water outlet pipe 14, and a cooling water inlet pipe 15. The gas treatment box drain pipe 16 and the induced draft fan 7 are composed. The cooling water inlet pipe 15 of the cooling water pipe 11 is connected to the cooling circulating water tank 6 through the cooling water circulating pump 23; the cooling water pipe 11 is connected to the cooling circulating water tank return pipe 22 of the cooling circulating water tank 6 through the cooling water outlet pipe 14; 32 is connected with the safety water tank air inlet 30 of the safety water tank 4 through the second connecting pipe 31; the combustible gas generated after the pyrolysis gas is processed by the gas treatment tank 3 is discharged through the combustible gas outlet 24 on the upper part of the gas treatment tank 3 as fuel recovery Utilization; the pyrolysis liquid produced after the pyrolysis gas is processed in the gas treatment tank 3 is transported to the pyrolysis liquid tank 5 through the gas treatment tank drainage pipe 16 at the lower part of the gas treatment tank 3 .

The safety water tank 4 is composed of a box body, an air inlet 30 of the safety water tank, an explosion vent 25 , a water supply pipe 29 , an overflow port 27 , a sewage pipe 28 and an inspection port 26 . The water level in the safety water tank 4 is 85% of the height of the safety water tank 4. The air inlet pipe 30 of the safety water tank is connected to the gas treatment tank explosion vent 32 and the pyrolysis liquid spray tank explosion vent 37 through the second connecting pipe 31, and the safety water tank enters. The gas pipe 30 goes deep into the water, and the air is prevented from flowing into the gas treatment box 4 by the water seal. When the flammable gas in the pyrolysis liquid spray tank 2 or the gas treatment box 4 is tempered and deflagrated, the gas generated by the deflagration is sprayed through the pyrolysis liquid. The explosion vent 37 of the shower tank or the explosion vent 32 of the gas treatment box enters the safety water tank 4 through the second connecting pipe 31, and under the action of the instantaneous pressure of the gas, the water in the safety water tank 4 is discharged through the explosion vent 25 of the safety water tank. , so as to achieve the effect of pressure relief, avoid the damage caused by the explosive gas to the gas treatment box 4 and the pyrolysis liquid spray tank 2, and ensure the safe and stable operation of the facility. After the pressure generated by the explosion gas is discharged through the explosion vent 25 of the safety water tank, the safety water tank 4 restores the water level in the safety water tank 4 to the original water level through the water replenishment pipe 29 .

The dry distillation pyrolysis gas treatment device of the present invention can not only process the pyrolysis gas generated by dry distillation of kitchen waste, but also can process dry distillation domestic waste, sewage treatment plant sludge, livestock manure, industrial organic solid waste, organic hazardous waste, Pyrolysis gas generated in the process of waste oil residue, waste paint bucket, oily sludge, etc.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

It should be noted that other equipment used in the present invention is known equipment, and cooperates with the dry distillation pyrolysis gas treatment device of the present invention to complete the recycling of kitchen waste, so the known equipment will not be repeated.

Claims (9)

1. A method for resource utilization of kitchen waste: 1) Water cleaning and preliminary separation of kitchen waste; 2) Scrap metal, waste plastic, bone, glass, and ceramics are selected from the separated slag; the bone is processed into bone meal for sale, and the waste plastic is packaged and sold, and the remaining food slag is pulverized, dehydrated, and dried for dry distillation; 3) The separated liquid is further separated into biological oil, fine slag and sewage; the biological oil is stored, the fine slag is converted into biochar by dry distillation, and the biogas generated after the anaerobic treatment of sewage is desulfurized as the fuel of the dry distillation unit. ; 4) dry distillation of biogas residue after drying; 5) The dry distillation pyrolysis gas produced in the dry distillation process is condensed and separated into combustible gas as the fuel for the dry distillation unit, and the remaining liquid is separated into biomass oil and wood vinegar by oil and water. 2 . The method for recycling kitchen waste according to claim 1 , wherein the slag in step 2 is sorted by photoelectricity, eddy current and electromagnetic. 3 . 3 . The method for recycling kitchen waste according to claim 1 , wherein the sewage separated in step 3 is subjected to anaerobic treatment, aerobic treatment and adsorption treatment. 4 . 4. The method for recycling kitchen waste as claimed in claim 1, wherein step 4 is to dry the digestate with a moisture content of 80% to a moisture content of less than 30%. 5. The processing system for realizing the method for recycling kitchen waste according to claim 1, comprising: 1) The pretreatment workshop with a high-level dumping platform is transported to the disposal site by vehicles that collect and transport kitchen waste, and then dumped into the hopper through the high-level dumping platform; 2) Drum screen, which is used for hydraulic cleaning and preliminary separation of kitchen waste in the hopper; 3) Photoelectric, eddy current and electromagnetic sorting devices are used to further sort scrap metal, scrap plastic, bone, glass and ceramics from the initially separated slag; 4) Bone crusher, which is used to process the bones separated by photoelectric, eddy current and electromagnetic sorting devices into bone meal and pack them; 5) A slag pulverizer, a dehydrator and a dryer, which are used to pulverize, dehydrate and dry the food slag separated by the photoelectric, eddy current and electromagnetic sorting devices and then enter the dry distillation device; 6) The rotary drum screen is connected to the rotating fine grid, the grease trap and the three-phase centrifuge, and the liquid screened by the rotary drum screen is further separated into biological oil, wood vinegar, fine slag and sewage; the biological oil enters the storage tank. The oil tank is stored, the wood vinegar liquid is sent to the wood vinegar liquid tank for storage, and the fine slag material enters the dry distillation device after drying; 7) Anaerobic feed tank and anaerobic reactor are used for anaerobic treatment of sewage produced in the whole process, and the biogas produced after treatment is desulfurized as fuel for dry distillation unit; 8) Aerobic processor, magnetic flocculation processor, active coke filtration and adsorption deep processor, reverse osmosis processor, which are used to perform aerobic treatment, magnetic flocculation treatment, active coke filtration and adsorption on the water treated by the anaerobic reactor Discharge up to standard after deep treatment and reverse osmosis treatment; 9) Intermediate silo, conveying device and dry distillation device for dry distillation of the dried biogas residue; 10) Biochar silo, used to store the biochar converted into after dry distillation; 11) Dry distillation pyrolysis gas treatment device, which is used to recover the combustible gas and pyrolysis liquid in the pyrolysis gas generated in the dry distillation process of the kitchen waste through the condensate spray tank and the gas treatment box, and the combustible gas is transported To the dry distillation unit as fuel, the pyrolysis liquid is transported to the pyrolysis liquid tank; The dry distillation pyrolysis gas treatment device includes: dry distillation device, pyrolysis liquid spray tank, gas treatment box, safety water tank, pyrolysis liquid tank, cooling circulating water tank, induced draft fan, pyrolysis liquid spray tank air inlet, hoisting hole, Inspection port, cooling water pipe, pyrolysis liquid spray pipe, pyrolysis liquid spray tank drain pipe, cooling water outlet pipe, cooling water inlet pipe, gas treatment tank drain pipe, box body, pyrolysis liquid tank inlet, heat Solution delivery pump, pyrolysis solution overflow pipe, pyrolysis solution settling tank, return pipe of cooling circulating water tank, cooling water circulating pump, combustible gas outlet, explosion vent, inspection port, overflow port, sewage pipe, water supply pipe, safety Water tank air inlet, second connection pipe, gas treatment box vent, gas treatment box air inlet, first connection pipe, pyrolysis liquid spray tank inlet, pyrolysis gas outlet of dry distillation device and pyrolysis liquid spray Shower tank vent. 6. The processing system according to claim 5, wherein the pyrolysis gas generated by the dry distillation device in the process of processing the kitchen waste enters the pyrolysis liquid spray tank and the gas treatment box in turn by the action of the induced draft fan; the pyrolysis gas After treatment, the combustible gas is discharged from the combustible gas outlet of the gas treatment box; the pyrolysis liquid is transported to the pyrolysis liquid tank through the pipeline from the liquid outlet of the pyrolysis liquid spray tank and the liquid discharge pipe of the gas treatment tank; The pyrolysis liquid is transported to the pyrolysis liquid spray pipe of the pyrolysis liquid spray tank through the pyrolysis liquid delivery pump. 7. The processing system according to claim 5 or 6, wherein the pyrolysis liquid spray tank is composed of a tank body, a pyrolysis liquid spray pipe, an air inlet of the pyrolysis liquid spray tank, and an outlet from the pyrolysis liquid spray tank. The gas port, the pyrolysis liquid spray tank drain pipe, and the maintenance port are composed of; the pyrolysis gas firstly enters the pyrolysis liquid spray tank through the pyrolysis liquid spray tank air inlet through the pyrolysis gas outlet of the dry distillation device of the dry distillation device, and the heat is heated. After the pyrolysis gas is treated by the pyrolysis liquid spray tank, the pyrolysis liquid is discharged from the drain pipe of the pyrolysis liquid spray tank at the bottom of the pyrolysis liquid spray tank and transported to the pyrolysis liquid tank, and the pyrolysis gas is sprayed by the pyrolysis liquid. The gas outlet of the pyrolysis liquid spray tank at the top of the tank is transported to the gas treatment box air inlet through the first connecting pipe and enters the gas treatment box. 8. The treatment system according to claim 7, wherein the gas treatment box is composed of a cooling water pipe, an air inlet of the gas treatment box, a combustible gas outlet, an explosion vent of the gas treatment box, a second connecting pipe, a cooling water outlet pipe, a cooling water outlet, and a cooling water outlet. It consists of water inlet pipe, gas treatment box drain pipe and induced draft fan; the cooling water inlet pipe is connected to the cooling circulating water tank through the cooling water circulating pump; the cooling water pipe is connected to the cooling circulating water tank return pipe of the cooling circulating water tank through the cooling water outlet pipe; the gas treatment The tank explosion vent is connected to the safety water tank air inlet of the safety water tank through the second connecting pipe; the combustible gas generated after the pyrolysis gas is processed by the gas treatment tank is discharged through the combustible gas outlet on the upper part of the gas treatment tank as fuel for recycling; The pyrolysis liquid produced after the degassing is processed in the gas treatment box is transported to the pyrolysis liquid tank through the gas treatment box drain pipe at the lower part of the gas treatment box. 9. The processing system according to claim 5, wherein the safety water tank is composed of a box body, an air inlet of the safety water tank, an explosion vent, a water supply pipe, an overflow port, a sewage pipe and an inspection port; the water level in the safety water tank is 85% of the height of the safety water tank, the air intake pipe of the safety water tank is connected to the gas treatment tank venting port and the pyrolysis liquid spray tank venting port through the second connecting pipe, the safety water tank intake pipe is deep into the water, and the air is prevented from flowing into the gas by the water seal Treatment box; when the flammable gas in the pyrolysis liquid spray tank or the gas treatment box is tempered and deflagrated, the gas generated by the deflagration will be released from the pyrolysis liquid spray tank or the gas treatment box through the second connection. The pipe enters the safety water tank, and under the action of the instantaneous pressure of the gas, the water in the safety water tank is drained out through the explosion vent of the safety water tank; after the pressure generated by the explosion gas is discharged through the explosion vent of the safety water tank, the safety water tank is filled with water. The pipe restores the water level in the safety tank to its original level.

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