Rural garbage harmless cooperative treatment system and method capable of comprehensively utilizing energy

Abstract

The invention belongs to the technical field of garbage treatment, and relates to a rural garbage harmless cooperative treatment system and method capable of comprehensively utilizing energy, and the rural garbage harmless cooperative treatment system comprises a died livestock and poultry chemical treatment module, a household garbage hydrothermal carbonization treatment module, a supercritical water oxidation treatment module and a wet straw treatment module. Through cooperation of the died livestock and poultry chemical treatment module, the household garbage hydrothermal carbonization treatment module, the supercritical water oxidation treatment module and the wet straw treatment module, the died livestock and poultry, the household garbage and the wet straw can be synergistically and harmlessly treated; in addition, meat and bone meal products, animal fat products, hydrothermal carbon products and biomass particle products can be produced in the treatment process, on one hand, the problems caused by a landfill mode are avoided, the environment is protected, and direct threats to the body health of surrounding residents are avoided, and on the other hand, the treatment cost of the rural garbage is reduced; and the resource recovery rate and the energy utilization efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of garbage disposal, and relates to an energy comprehensive utilization rural garbage harmless collaborative treatment system and method. BACKGROUND

[0002] The garbage treatment level is an important scale for measuring the degree of social civilization and the sustainable development capability. With the continuous advancement of urbanization process in China, the imbalance between urban and rural development is increasingly prominent. The urban areas have established a modern garbage treatment system which is diversified and systematic, taking garbage incineration for power generation as the core, combined with centralized anaerobic digestion technology, biological treatment technology, etc. However, the rural areas have not yet formed a scientific, efficient and sustainable garbage treatment mode due to the small amount of garbage, wide distribution, complex composition and other characteristics, as well as the weak infrastructure, insufficient investment and poor technical adaptability.

[0003] At present, in the practice of treating rural garbage, kitchen waste and livestock manure are mostly disposed by anaerobic biogas production, while agricultural and forestry straws, household garbage and dead animals have not yet been properly treated. These untreated garbage is largely disposed by landfill, which easily causes the problem of "garbage surrounding villages", pollutes the environment and directly threatens the health of surrounding residents, and restricts the sustainable development of rural ecological environment. SUMMARY

[0004] The present application aims to provide an energy comprehensive utilization rural garbage harmless collaborative treatment system and method, which can treat agricultural and forestry straws, household garbage and dead animals, avoid the problems caused by landfill, protect the environment, and avoid direct threats to the health of surrounding residents.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present application is as follows: An energy comprehensive utilization rural garbage harmless collaborative treatment system, comprising: A dead livestock and poultry processing module is used for crushing and high-temperature processing of dead livestock and poultry to obtain animal tissue fluid, animal oil, steam and oil-containing solid residue. The animal oil and oil-containing solid residue are pressed to obtain an oil-water mixture and a meat and bone meal product. The steam is condensed to obtain condensed water. The oil-water mixture is separated to obtain an animal oil product and water. The household garbage hydrothermal carbonization treatment module comprises, which are connected in sequence, a pulping machine, a first high-pressure pump, a first preheater, a first reactor and a first treatment assembly; the pulping machine is connected with the dead livestock and poultry processing module; the pulping machine is used for mixing the sorted and crushed household garbage, animal tissue fluid, condensed water and separated water to obtain water-containing slurry; the first high-pressure pump and the first preheater are used for pressurizing and preheating the water-containing slurry; the first reactor is used for hydrothermal carbonization reaction of the water-containing slurry to obtain hydrothermal carbon and liquid phase product; and the first treatment assembly is used for processing the hydrothermal carbon to obtain hydrothermal carbon product. The supercritical water oxidation treatment module comprises, which are connected in sequence, a second high-pressure pump, a second preheater, a heater, a second reactor and a second treatment assembly; the second high-pressure pump, the second preheater and the heater are used for sequentially pressurizing, preheating and heating the liquid phase product generated by the household garbage hydrothermal carbonization treatment module; the second reactor is used for mixing oxygen and the liquid phase product to perform supercritical water oxidation reaction to obtain fluid with a certain temperature; the second treatment assembly is connected with the dead livestock and poultry processing module; the second treatment assembly is used for providing heat for high-temperature processing by using the fluid, and separating and processing the cooled fluid to obtain solid phase residue, water phase product and gas phase product. The wet straw treatment module is connected with the household garbage hydrothermal carbonization treatment module, and is used for sequentially crushing, drying and segmenting the straw to obtain biomass pellet material; the biomass pellet material is used for combustion to provide heat for the first preheater and the first treatment assembly.

[0006] The application also has the characteristics that: The dead livestock and poultry processing module comprises: The first crusher is used for crushing the dead livestock and poultry; The processing machine is connected with the first outlet of the first crusher, and is used for high-temperature processing of the crushed dead livestock and poultry; The air-cooled condenser is connected with the first outlet of the processing machine, and is used for condensing the steam; The presser is connected with the second outlet of the processing machine, and is used for pressing the oil-containing solid phase residue; The oil separator is connected with the first outlet of the presser, and is used for separating the oil-water mixture.

[0007] The first inlet of the pulping machine is connected with the outlet of the second crusher; the inlet of the second crusher is connected with the outlet of the sorting device; the second inlet of the pulping machine is connected with the second outlet of the first crusher, the outlet of the air-cooled condenser and the first outlet of the oil separator respectively; and the outlet of the pulping machine is connected with the inlet of the first high-pressure pump.

[0008] The first treatment assembly comprises: an expansion container, the inlet of which is connected to the first outlet of the first reactor and is used to reduce the pressure of the hydrothermal char; A filter press, wherein the first inlet is connected to the first outlet of the expansion vessel via a screw conveyor, and the first outlet of the filter press is connected to the pulping machine. The filter press is used to filter and dehydrate the hydrothermal carbon after decompression, and to feed the dehydrated water into the pulping machine. The first dryer has an inlet connected to the second outlet of the filter press and is used for drying the filter press after filtration.

[0009] The second outlet of the first reactor is connected to the second inlet of the first preheater for preheating the aqueous slurry using the liquid product.

[0010] The first outlet of the second reactor is connected to the second preheater.

[0011] The second processing component includes: a steam generator, wherein a first inlet is connected to the second preheater, a first outlet of the steam generator is connected to the second inlet of the chemical machine, and the steam generator is used to utilize the heat of the fluid to heat the steam and introduce the steam into the chemical machine; a pressure reducer, the inlet of which is connected to the second outlet of the steam generator, and is used to reduce the pressure of the fluid after the temperature is reduced; A three-phase separator, the inlet of which is connected to the outlet of the pressure reducer, the first outlet of the three-phase separator is connected to the second inlet of the filter press, and the second outlet of the three-phase separator is connected to the pulping machine. The three-phase separator is used to separate the fluid after pressure reduction and send part of the water phase product to the pulping machine; The inlet of the water softener is connected to the third outlet of the three-phase separator, and the outlet of the water softener is connected to the second inlet of the steam generator.

[0012] The wet straw processing module includes: A third crusher, the first outlet of which is connected to the pulper, is used to crush the straw and send the plant tissue fluid obtained by crushing into the pulper; a second dryer, the inlet of which is connected to the second outlet of the third crusher, for drying the crushed straw; A shaping machine, the inlet of which is connected to the outlet of the second dryer, and is used to segment the dried straw; The heating boiler has an inlet connected to the outlet of the briquetting machine and is used to burn part of the biomass pellets. The outlet of the heating boiler is respectively connected to the first preheater, the first dryer and the second dryer.

[0013] A method for harmless coordinated treatment of rural garbage with comprehensive energy utilization, comprising the following steps: The dead livestock and poultry are crushed and high-temperature treatment to obtain animal tissue fluid, animal fat, steam and oil-containing solid residue, the animal fat and oil-containing solid residue are squeezed to obtain oil-water mixture and meat and bone meal product, the steam is condensed to obtain condensed water, and the oil-water mixture is separated to obtain animal fat product and water; The household garbage is sorted and crushed, and the crushed product is mixed with the animal tissue fluid obtained by the dead livestock and poultry treatment module, the condensed water and the separated water to obtain water-containing slurry, the water-containing slurry is pressurized and preheated to carry out hydrothermal carbonization reaction to obtain hydrothermal carbon and liquid product, and the hydrothermal carbon is subjected to pressure reduction, pressure filtration and drying to obtain hydrothermal carbon product; The liquid product generated by the household garbage hydrothermal carbonization treatment module is pressurized, heated and mixed with oxygen to carry out supercritical water oxidation reaction to obtain fluid with a certain temperature, the fluid is used to heat the liquid product and provide heat for the high-temperature treatment, and the fluid after cooling is subjected to pressure reduction and separation to obtain solid residue, water product and gas product, and the solid residue is mixed with the hydrothermal carbon for pressure filtration; The straw is crushed, dried and segmented in sequence to obtain biomass granular material, part of the biomass granular material is used for combustion to provide heat for the straw drying, water-containing slurry preheating and hydrothermal carbon drying, and the other part of the biomass granular material is used as product.

[0014] The water content of the water-containing slurry is 70% to 80%.

[0015] The rural garbage harmless collaborative treatment system and method with energy comprehensive utilization has the following advantages: The dead livestock and poultry treatment module, the household garbage hydrothermal carbonization treatment module, the supercritical water oxidation treatment module and the wet straw treatment module are matched to realize the harmless treatment of the dead livestock and poultry, the household garbage and the wet straw, and the meat and bone meal product, the animal fat product, the hydrothermal carbon product and the biomass granular material product are produced in the treatment process, which avoids the problems caused by landfill, protects the environment, avoids the direct threat to the health of the surrounding residents, reduces the treatment cost of the rural garbage and improves the resource recovery rate and energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0017] Figure 2 It is a schematic diagram of the overall process of the present application.

[0018] REFERENCE NUMERALS: 1. First crusher, 2. Chemical processing machine, 3. Press, 4. Second crusher, 5. First dryer, 6. Air-cooled condenser, 7. Oil separator, 8. Shaping machine, 9. Sorting device, 10. Third crusher, 11. Pulping machine, 12. First high-pressure pump, 13. Heating boiler, 14. First reactor, 15. Heater, 16. First preheater, 17. Second preheater, 18. Steam generator, 19. Pressure reducer, 20. Three-phase separator, 21. Second reactor, 22. Water softener, 23. Second dryer, 24. Filter press, 25. Screw conveyor, 26. Expansion tank, 27. Second high-pressure pump. DETAILED DESCRIPTION

[0019] The technical solutions in the present invention will be described clearly and in detail below with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0020] like Figure 1As shown, the present application provides a rural garbage harmless collaborative treatment system of energy comprehensive utilization, including disease and death livestock and poultry chemical preparation module, domestic waste hydrothermal carbonization treatment module, supercritical water oxidation treatment module and wet straw treatment module, the disease and death livestock and poultry chemical preparation module is used to break and high temperature chemical preparation treatment to disease and death livestock and poultry, obtain animal tissue fluid, animal oil, steam and oil-containing solid phase residue, the animal oil and oil-containing solid phase residue are squeezed to obtain oil-water mixture and bone meal product, the steam is condensed to obtain condensed water, and the oil-water mixture is separated to obtain animal oil product and water, the domestic waste hydrothermal carbonization treatment module includes the pulper 11, the first high-pressure pump 12, the first preheater 16, the first reactor 14 and the first processing assembly connected in sequence, the pulper 11 is connected with the disease and death livestock and poultry chemical preparation module, the pulper 11 is used to mix the sorted and broken domestic waste with animal tissue fluid, condensed water and separated water to obtain water-containing slurry, the first high-pressure pump 12 and the first preheater 16 are used to pressurize and preheat the water-containing slurry, the first reactor 14 is used to make the water-containing slurry hydrothermal carbonization reaction to obtain hydrothermal carbon and liquid phase product, and the first processing assembly is used to treat the hydrothermal carbon to obtain hydrothermal carbon product, the supercritical water oxidation treatment module includes the second high-pressure pump 27, the second preheater 17, the heater 15, the second reactor 21 and the second processing assembly connected in sequence, the second high-pressure pump 27, the second preheater 17 and the heater 15 are used to sequentially pressurize, preheat and heat the liquid phase product generated by the domestic waste hydrothermal carbonization treatment module, the second reactor 21 is used to mix oxygen and the liquid phase product to carry out supercritical water oxidation reaction to obtain fluid with a certain temperature, the second processing assembly is connected with the disease and death livestock and poultry chemical preparation module, the second processing assembly is used to utilize the fluid to provide heat for high-temperature chemical preparation treatment, and the separated fluid after cooling is treated to obtain solid phase residue, water phase product and gas phase product, the solid phase residue is mixed with the hydrothermal carbon and is pressure filtered, the wet straw treatment module, the wet straw treatment module is connected with the domestic waste hydrothermal carbonization treatment module, the wet straw treatment module is used to break, dry and prepare the straw in sequence to obtain biomass pellet material, the biomass pellet material is used to provide heat for the first preheater 16, the first processing assembly and the straw drying, wherein the biomass pellet material is divided into two parts, one part is used for combustion to provide heat, and the other part is used as biomass pellet material product. The present application can treat disease and death livestock and poultry, domestic waste and wet straw in a harmless manner through the cooperation of the disease and death livestock and poultry chemical preparation module, the domestic waste hydrothermal carbonization treatment module, the supercritical water oxidation treatment module and the wet straw treatment module, and can also produce bone meal product, animal oil product, hydrothermal carbon product and biomass pellet material product during the treatment process. On the one hand, it avoids the problems caused by landfill, protects the environment and avoids direct threats to the health of surrounding residents. On the other hand, it reduces the treatment cost of rural garbage, improves resource recovery rate and energy utilization efficiency.

[0021] As Figure 1 shown, the disease dead livestock and poultry processing module includes a first crusher 1, a processing machine 2, a forced air condenser 6, a press 3 and an oil separator 7, the first crusher 1 is used for crushing the disease dead livestock and poultry, that is, the first crusher 1 adds the disease dead livestock and poultry at the inlet, the first inlet of the processing machine 2 is connected with the first outlet of the first crusher 1, the processing machine 2 is used for high-temperature processing of the crushed disease dead livestock and poultry, the inlet of the forced air condenser 6 is connected with the first outlet of the processing machine 2, the forced air condenser 6 is used for condensing the steam, the inlet of the press 3 is connected with the second outlet of the processing machine 2, the press 3 is used for pressing the oil-containing solid residue, the inlet of the oil separator 7 is connected with the first outlet of the press 3, the oil separator 7 is used for separating the oil-water mixture, and the second outlet of the oil separator 7 is used for discharging the meat and bone meal product.

[0022] As Figure 1 shown, the first inlet of the pulper 11 is connected with the outlet of the second crusher 4, the inlet of the second crusher 4 is connected with the outlet of the sorting device 9, the second inlet of the pulper 11 is respectively connected with the second outlet of the first crusher 1, the outlet of the forced air condenser 6 and the first outlet of the oil separator 7, the outlet of the pulper 11 is connected with the inlet of the first high-pressure pump 12, the sorting device 9 is used for sorting the household garbage, removing inorganic matter including metal, non-metallic mineral and the like, and obtaining organic components including plastic, wood, paper and the like after sorting, the second crusher 4 is used for crushing the sorted household garbage, the first inlet of the pulper 11 is connected with the outlet of the second crusher 4, the second inlet of the pulper 11 is respectively connected with the second outlet of the first crusher 1, the outlet of the forced air condenser 6 and the first outlet of the oil separator 7, the first processing assembly is connected with the first reactor 14, and the first processing assembly is used for decompression, pressure filtration and drying of the hydrothermal carbon to obtain a hydrothermal carbon product.

[0023] As Figure 1 shown, the first processing assembly includes an expansion vessel 26, a filter press 24 and a first dryer 5, the inlet of the expansion vessel 26 is connected with the first outlet of the first reactor 14, the expansion vessel 26 is used for decompression of the hydrothermal carbon, that is, the expansion vessel 26 is used for expansion flash evaporation of the hydrothermal carbon carrying a part of water, so as to reduce it to normal pressure and obtain a certain amount of steam, the first inlet of the filter press 24 is connected with the first outlet of the expansion vessel 26 through a screw conveyor 25, the screw conveyor 25 is used for conveying the decompressed hydrothermal carbon into the filter press 24, the first outlet of the filter press 24 is connected with the pulper 11, the filter press 24 is used for pressure filtration and dewatering of the decompressed hydrothermal carbon, and the discharged water is sent into the pulper 11, the inlet of the first dryer 5 is connected with the first outlet of the filter press 24, and the first dryer 5 is used for drying the filter press 24 after pressure filtration.

[0024] AsFigure 1 As shown, the second outlet of the first reactor 14 is connected to the second inlet of the first preheater 16 for preheating the aqueous slurry with the liquid product.

[0025] like Figure 1 As shown, the first outlet of the second reactor 21 is connected to the second preheater 17, the inlet of the second preheater 17 is connected to the second outlet of the first preheater 16 via the second high-pressure pump 27, the inlet of the heater 15 is connected to the first outlet of the second preheater 17, the first inlet of the second reactor 21 is connected to the outlet of the heater 15, the second inlet of the second reactor 21 is used to introduce oxygen, and the second processing component is connected to the second preheater 17.

[0026] like Figure 1 As shown, the second processing component includes a steam generator 18, a pressure reducer 19, a three-phase separator 20 and a water softener 22. The first inlet of the steam generator 18 is connected to the second outlet of the second preheater 17, and the first outlet of the steam generator 18 is connected to the second inlet of the chemical processing machine 2. The steam generator 18 is used to use the heat of the fluid to heat and obtain steam, and introduce the steam into the chemical processing machine 2. The inlet of the pressure reducer 19 is connected to the second outlet of the steam generator 18. The pressure reducer 19 is used to reduce the pressure of the cooled fluid. The inlet of the three-phase separator 20 is connected to the pressure reducer. The outlet of the three-phase separator 20 is connected to the second inlet of the filter press 24, and the second outlet of the three-phase separator 20 is connected to the pulping machine 11. The three-phase separator 20 is used to separate the fluid after pressure reduction to obtain solid phase residue, water phase product, and gas phase product, and send part of the water phase product to the pulping machine 11, and send the solid phase residue to the filter press 24 as a support agent for hydrothermal carbon. The inlet of the water softener 22 is connected to the third outlet of the three-phase separator 20, and the outlet of the water softener 22 is connected to the second inlet of the steam generator 18.

[0027] like Figure 1As shown, the wet straw treatment module includes a third crusher 10, a second dryer 23, a briquetting machine 8 and a heating boiler 13, the first outlet of the third crusher 10 is connected with the pulper 11, the third crusher 10 is used for crushing the straw, and the plant tissue fluid obtained by crushing is sent into the pulper 11, that is, the inlet of the third crusher 10 is used for adding straw, the second inlet of the second dryer 23 is connected with the outlet of the third crusher 10, the second dryer 23 is used for drying the crushed straw, the inlet of the briquetting machine 8 is connected with the outlet of the second dryer 23, the briquetting machine 8 is used for segmenting the dried straw, and the inlet of the heating boiler 13 is connected with the outlet of the briquetting machine 8, the heating boiler 13 is used for burning part of the biomass pellet material, and the outlet of the heating boiler 13 is connected with the first preheater 16, the first dryer 5 and the second dryer 23 respectively, and the high-temperature flue gas generated by the combustion of the biomass pellet material in the heating boiler 13 is introduced into the first preheater 16, the first dryer 5 and the second dryer 23 respectively, so as to provide heat for the first preheater 16, the first dryer 5 and the second dryer 23 respectively.

[0028] As shown in the figure, Figure 1 As shown, the second outlet of the expander 26, the second outlet of the three-phase separator 20 and the first outlet of the third crusher 10 are connected with the third inlet of the pulper 11 respectively, a certain amount of steam generated in the expander 26, part of the water separated from the three-phase separator 20 and the plant tissue fluid generated by crushing the straw by the third crusher 10 are introduced into the pulper 11 to prepare the aqueous slurry as the hydrothermal carbonization raw material.

[0029] Among them, the gas phase product generated by the three-phase separator 20 is only carbon dioxide and a small amount of residual oxygen, which is directly discharged up to standard, and the water phase product is divided into three streams, one of which is introduced into the softening water machine 22 to generate softening water for the steam generator 18, the second stream enters the pulper 11, and the third stream is normal reaction water which can be directly discharged.

[0030] Among them, the first preheater 16 and the second preheater 17 are both shell-and-tube heat exchangers, cold fluid flows through the tube side, and hot fluid flows through the shell side, the fuel type of the heater 15 includes but is not limited to electric heating, electromagnetic induction heating, crude oil heating, natural gas heating or biomass pellet material heating, the first dryer 5 and the second dryer 23 are both tube heat exchangers, and the second reactor 21 is a SCWO reactor, that is, a supercritical water oxidation reactor.

[0031] As shown in the figure, Figure 2 As shown in the figure, the present application also provides a harmless and collaborative treatment method for rural garbage, which comprises the following steps: The dead livestock and poultry are crushed and treated by high-temperature processing to obtain animal tissue fluid, animal fat, steam and oil-containing solid residue, the animal fat and the oil-containing solid residue are squeezed to obtain an oil-water mixture and a meat and bone meal product, the steam is condensed to obtain condensed water, and the oil-water mixture is separated to obtain animal fat product and water; The household garbage is sorted and crushed, and the crushed product is mixed with the animal tissue fluid obtained by the dead livestock and poultry processing module, the condensed water and the separated water to obtain a water-containing slurry, the water-containing slurry is pressurized and preheated and then subjected to a hydrothermal carbonization reaction to obtain hydrothermal carbon and a liquid product, and the hydrothermal carbon is subjected to pressure reduction, pressure filtration and drying to obtain a hydrothermal carbon product. The liquid product generated by the household garbage hydrothermal carbonization processing module is pressurized, heated and mixed with oxygen in sequence and then subjected to a supercritical water oxidation reaction to obtain a fluid with a certain temperature, the fluid is used to heat the liquid product and provide heat for the high-temperature processing, the fluid after cooling is depressurized and separated to obtain solid residue, aqueous product and gaseous product, and the solid residue is mixed with the hydrothermal carbon and subjected to pressure filtration. The straw is sequentially crushed, dried and processed into segments to obtain biomass granular material, a part of which is used for combustion to provide heat for the straw drying, the water-containing slurry preheating and the hydrothermal carbon drying, and the other part is used as a product.

[0032] The water content of the water-containing slurry is 70% to 80%, and the straw is mainly wet straw.

[0033] Working principle: The dead livestock and poultry are added into the first crusher 1 for crushing, the crushed dead livestock and poultry are subjected to high-temperature processing in the processing machine 2, the reaction conditions are 160℃ and 2MPa, and the reaction time is 3 hours, to obtain animal tissue fluid, animal fat, steam and oil-containing solid residue, the steam is condensed in the air-cooled condenser 6 to obtain condensed water, the oil-containing solid residue is subjected to squeezing in the squeezing machine 3 to obtain an oil-water mixture and a meat and bone meal product, and the oil-water mixture is separated in the oil separator 7 to obtain animal fat product and water.

[0034] The household garbage is added into the sorting device 9 for sorting, and inorganic substances including metals and non-metallic minerals are removed. The sorted household garbage is crushed in the second crusher 4, and then is mixed with the animal tissue fluid obtained from the dead livestock and poultry, the condensed water, and the separated water in the pulper 11 to obtain water-containing slurry with a water content of 70% to 80%. The water-containing slurry is pressurized to 2 MPa by the first high-pressure pump 12, and then is preheated to 210°C in the first preheater 16 to reach the water thermal carbonization reaction temperature and pressure. The preheated water-containing slurry is subjected to the water thermal carbonization reaction in the first reactor 14, and the reaction time is 60 minutes. The amino acids, lipids, lignin, cellulose, and plastic in the water-containing slurry are subjected to cracking, recombination, and other steps to obtain hydrothermal carbon and liquid phase products. The first reactor 14 is provided with a filter screen with a filtering precision of 100 μm. Large-particle hydrothermal carbon is intercepted in the filter screen, is discharged to the expansion vessel 26 through the conveying, and the liquid phase products pass through the filter screen to the second return of the first reactor 14, and then enter the first preheater 16 to transfer heat to the water-containing slurry, and the temperature of the liquid phase products is reduced to 80°C. The pressure is kept at 2 MPa, and the hydrothermal carbon containing a part of water in the expansion vessel 26 is expanded and flashed to reduce the pressure to normal pressure, and a certain amount of steam is generated. The steam enters the pulper 11 to adjust the material, and the hydrothermal carbon is conveyed into the filter press 24 by the screw conveyor 25 to be dewatered by pressure filtration. The dewatered hydrothermal carbon enters the first dryer 5 to be dried, and the dried hydrothermal carbon product is obtained.

[0035] The liquid phase products in the first preheater 16 are pressurized to 25 MPa by the second high-pressure pump 27, and then are preheated in the second preheater 17, are heated to about 400°C in the heater 15, and finally are subjected to the supercritical water oxidation reaction in the second reactor 21. The reaction is a large amount of heat release, and the temperature of the material is increased to 500°C to 600°C during the reaction process. After the reaction, the fluid at 500°C to 600°C is obtained. The fluid is used to preheat the liquid phase products in the second preheater 17, and the fluid is cooled to 300°C to 350°C by heat exchange, and then enters the steam generator 18 to heat the water therein to obtain steam at 180°C and 1.1 MPa. The fluid is cooled to 80°C by heat exchange, and then is depressurized to normal pressure in the pressure reducer 19. Subsequently, the fluid is separated in the three-phase separator 20 to obtain solid phase residues, water phase products, and gas phase products. The solid phase residues enter the filter press 24 to be mixed with the hydrothermal carbon for pressure filtration as a proppant. The gas phase products are only carbon dioxide and a small amount of residual oxygen, and are directly discharged to meet the standards. The water phase products are divided into three streams. One stream enters the water softening machine 22 to generate soft water for the steam generator 18. The second stream enters the pulper 11. The third stream is normal reaction water, and can be directly discharged.

[0036] The straw is added into the third crusher 10 for crushing, to obtain crushed straw and plant tissue fluid, the plant tissue fluid is introduced into a pulper 11 to prepare a slurry containing water, the crushed straw is introduced into a second dryer 23 for drying, and the dried straw is introduced into a briquetting machine 8 for briquetting, to obtain biomass pellet fuel, part of the biomass pellet fuel is introduced into a heating boiler 13 to generate high-temperature flue gas, and the high-temperature flue gas is introduced into a first preheater 16, the first dryer 5 and the second dryer 23 respectively, to provide heat for the first preheater 16, the first dryer 5 and the second dryer 23, and the other part of the biomass pellet fuel is used as a product.

[0037] The rural garbage harmless and collaborative treatment system and method with energy comprehensive utilization according to the present application have other advantages as follows: Firstly, the present application forms a treatment method for the harmless treatment of dead animals and the collaborative disposal of household garbage.

[0038] The water phase product of the conventional dead livestock and poultry processing treatment process (including the animal tissue fluid generated by the crusher, the impurity-containing steam generated in the processing process, and the residual water separated by the oil separator) is treated by biological treatment technology, which is similar to a municipal sewage treatment system and is suitable for large-flow wastewater treatment (generally, the daily treatment capacity is up to tens of thousands of cubic meters), however, the dead livestock and poultry in rural areas are scattered, and the daily treatment capacity is generally 5-10 tons, and the wastewater generated by it is generally only 4-8 tons per day, which is difficult to be treated by the wastewater biological treatment method. Therefore, water treatment is a bottleneck problem restricting the application of high-temperature processing technology in rural areas. The water content of conventional household garbage is only about 30%, while the water content of the material required by the hydrothermal carbonization process is at least 70%, so it is necessary to add water to the garbage during the production process.

[0039] The present application realizes the efficient resource utilization of waste by organically combining the high-temperature processing of dead animals with the hydrothermal carbonization technology of household garbage. Specifically, the organic wastewater generated in the processing process is upgraded by hydrothermal carbonization reaction, in which the organic components such as proteins and lipids are converted into hydrothermal carbon products with high added value in the reaction process; at the same time, the remaining organic components occur exothermic reaction under supercritical water oxidation conditions, and the heat generated is recycled to the processing machine through the steam recovery system, forming a closed-loop treatment system with energy self-sufficiency, which not only realizes the harmless treatment of waste, but also significantly improves the resource recovery rate and energy utilization efficiency through the cascade utilization of matter and energy.

[0040] Secondly, the present application forms a rapid and proper treatment method for wet straw.

[0041] For the resource utilization of crops and forestry straw, the current lowest cost and most mature technology is to make it into biomass pellet material. However, for fresh and high-moisture straw, the natural drying method is generally used to reduce the moisture content. However, for large-scale plantations, a large amount of straw needs to occupy a large amount of farmland for natural drying, which reduces the land rotation efficiency.

[0042] The present application can quickly reduce the moisture content of straw by crushing and pressing method, and the plant tissue fluid formed is recovered and used as raw material for hydrothermal carbonization reaction, realizing resource utilization. At the same time, the high-temperature flue gas formed by burning biomass pellet material provides heat for drying, realizing waste heat utilization.

[0043] Thirdly, the present application realizes low-cost operation through complementary use of energy.

[0044] It is difficult to properly handle garbage in rural areas as in urban areas, largely due to the lack of subsidies from local finance. The cost of garbage disposal is as high as 300 yuan / ton to 500 yuan / ton. Except for the rich areas in the southeast, the county governments in other places cannot afford such high disposal costs. The highest operating cost in the garbage disposal process is the heat cost, specifically the cost caused by material heating, drying and other processes.

[0045] The present application realizes low-cost operation through complementary use of energy. (1) The steam required for the treatment of dead livestock and poultry is generated by supercritical water oxidation exothermic, and the raw material of supercritical water oxidation reaction is the organic components in dead livestock and poultry and household garbage. (2) The heat required for the hydrothermal carbonization reaction at about 210 DEG C is obtained by burning biomass pellet material, which is made of local straw. (3) The supercritical water oxidation reaction itself generates heat, which can heat the cold material after the reaction, so the preheating of the material can be realized, and the supercritical water oxidation reaction process does not consume additional energy, but also generates heat for the high-temperature treatment of kitchen waste. (4) The heat used for wet biomass drying comes from the high-temperature flue gas waste heat of the biomass pellet material combustion furnace.

[0046] According to the calculation of a 50-ton device, the device has a normal operation process of 430kW of electric power, and the electricity cost is calculated at 0.8 yuan / kWh. The cost of processing 1 ton of dead animals is 46.1 yuan / ton, the cost of processing 1 ton of household garbage is 88.3 yuan / ton, the cost of processing 1 ton of wet straw is 10.2 yuan / ton, the cost of public power is 30.7 yuan / ton, and the cost of public oxygen (used in supercritical water oxidation treatment unit) is 20.1 yuan / ton, which is significantly lower than the cost of separate treatment.

[0047] Fourthly, the present application realizes zero discharge of waste water, waste gas and waste residue.

[0048] Rural areas face significant challenges in waste disposal, with the core problem being the economic and effective disposal of the "three wastes" (wastewater, waste gas, and waste residue) generated during the disposal process. For example, the organic wastewater generated by the high-temperature processing of dead livestock and poultry needs to be purified using biological treatment technology, which significantly increases the operating cost. The burning of household waste faces more complex pollution control problems, including the treatment of harmful gases such as nitrogen oxides, sulfur oxides, and dioxins. These pollutants require multiple purification systems, and for small-scale incineration facilities, the investment and operating cost of waste gas treatment equipment often exceeds the economic capacity. In addition, the fly ash generated by incineration is classified as hazardous waste, and its safe disposal requires special landfill sites or solidification treatment facilities, further increasing the disposal burden on rural areas. The high cost of "three wastes" treatment seriously restricts the application of conventional urban waste disposal technologies in rural areas.

[0049] The present application realizes the complete harmless treatment of the above-mentioned waste by using hydrothermal carbonization technology, supercritical water oxidation technology, and high-temperature processing technology, with no wastewater, waste gas, or waste residue discharged during the process. The specific process is as follows.

[0050] Fifth, the present application realizes the resource utilization of rural waste. Through the treatment of the present application, there are four products that can be sold externally, and two products that can be used as resources. The specific introduction is as follows:

[0051] (1) Meat and bone meal: The meat and bone meal generated by the high-temperature processing of dead livestock and poultry has been sterilized at high temperature and can be used as a feed additive. The current market price is 7000 yuan / ton to 10000 yuan / ton.

[0052] (2) Animal oil: The animal oil generated by the high-temperature processing of dead livestock and poultry can be used as a raw material for biodiesel. The current market price is 6500 yuan / ton to 8000 yuan / ton.

[0053] (3) Hydrothermal carbon: The hydrothermal carbon generated during the hydrothermal carbonization of household waste can be used as a raw material for municipal waste incineration power plants. The current market price is 800 yuan / ton to 1000 yuan / ton.

[0054] (4) Biomass pellet: Biomass pellets produced from wet straw can be used as general fuel. The current market price is 800 yuan / ton to 1000 yuan / ton. In addition, the wood ash generated by the combustion of biomass pellets can be used as an agricultural fertilizer / soil conditioner for field use, and the end water from supercritical water oxidation can be used as surface irrigation water.

[0055] It is to be understood that the present application is described by way of example only, and that modifications or alterations can be made to the features and embodiments described without departing from the spirit and scope of the application. In addition, modifications can be made to the features and embodiments described to accommodate specific situations and materials without departing from the spirit and scope of the application. Accordingly, the application is not limited to the specific embodiments disclosed herein, but rather, the scope of the application includes all embodiments falling within the scope of the claims.

Claims

1. A rural garbage harmless collaborative treatment system with comprehensive energy utilization, characterized by: include: The dead livestock and poultry processing module is used to crush and high-temperature process dead livestock and poultry to obtain animal tissue fluid, animal fat, steam and oil-containing solid phase residue, squeeze the animal fat and oil-containing solid phase residue to obtain an oil-water mixture and meat and bone meal products, condense the steam to obtain condensed water, and then separate the oil-water mixture to obtain animal fat products and water; A domestic waste hydrothermal carbonization treatment module comprises a pulping machine (11), a first high-pressure pump (12), a first preheater (16), a first reactor (14) and a first treatment component connected in sequence, wherein the pulping machine (11) is connected to the dead livestock and poultry treatment module, the pulping machine (11) is used to mix the sorted and crushed domestic waste with animal tissue fluid, condensed water and separated water to obtain an aqueous slurry, the first high-pressure pump (12) and the first preheater (16) are used to pressurize and preheat the aqueous slurry, the first reactor (14) is used to cause the aqueous slurry to undergo a hydrothermal carbonization reaction to obtain hydrothermal charcoal and a liquid phase product, and the first treatment component is used to treat the hydrothermal charcoal to obtain a hydrothermal charcoal product; The supercritical water oxidation treatment module comprises a second high-pressure pump (27), a second preheater (17), a heater (15), a second reactor (21) and a second treatment component connected in sequence, wherein the second high-pressure pump (27), the second preheater (17) and the heater (15) are used to pressurize, preheat and heat the liquid phase product generated by the domestic waste hydrothermal carbonization treatment module in sequence, the second reactor (21) is used to mix oxygen with the liquid phase product and then perform a supercritical water oxidation reaction to obtain a fluid with a certain temperature, the second treatment component is connected to the dead livestock and poultry chemical treatment module, the second treatment component is used to use the fluid to provide heat for the high-temperature chemical treatment, and to separate the cooled fluid to obtain a solid phase residue, an aqueous phase product and a gas phase product; The wet straw processing module is connected to the domestic waste hydrothermal carbonization processing module and is used to sequentially crush, dry and segment the straw to obtain biomass pellets, and utilize the combustion of the biomass pellets to provide heat for the first preheater (16) and the first processing component.

2. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 1 is characterized in that: The dead livestock and poultry processing module includes: A first crusher (1) is used to crush dead livestock and poultry; A chemical treatment machine (2), the first inlet of which is connected to the first outlet of the first crusher (1), for performing high-temperature chemical treatment on the crushed dead livestock and poultry; an air-cooled condenser (6), the inlet of which is connected to the first outlet of the chemical processing machine (2), and is used for condensing the steam; The inlet of the press (3) is connected to the second outlet of the chemical processing machine (2) and is used for squeezing the oil-containing solid residue; The oil separator (7) has an inlet connected to the first outlet of the press (3) and is used to separate the oil-water mixture.

3. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 2 is characterized in that: The first inlet of the pulping machine (11) is connected to the outlet of the second crusher (4), the inlet of the second crusher (4) is connected to the outlet of the sorting device (9), the second inlet of the pulping machine (11) is respectively connected to the second outlet of the first crusher (1), the outlet of the air-cooled condenser (6), and the first outlet of the oil separator (7), and the outlet of the pulping machine (11) is connected to the inlet of the first high-pressure pump (12).

4. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 3 is characterized in that: The first processing component includes: an expansion vessel (26), the inlet of which is connected to the first outlet of the first reactor (14), for reducing the pressure of the hydrothermal char; A filter press (24), the first inlet of which is connected to the first outlet of the expansion container (26) via a screw conveyor (25), the first outlet of the filter press (24) being connected to the pulping machine (11), the filter press (24) being used to filter and dehydrate the hydrothermal charcoal after pressure reduction, and to feed the dehydrated water into the pulping machine (11); The first drying machine (5) has an inlet connected to the second outlet of the filter press (24) and is used to dry the filter press (24) after filtration.

5. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 3 is characterized in that: The second outlet of the first reactor (14) is connected to the second inlet of the first preheater (16) for preheating the aqueous slurry using the liquid phase product.

6. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 5 is characterized in that: The first outlet of the second reactor (21) is connected to the second preheater (17).

7. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 6 is characterized in that: The second processing component includes: a steam generator (18), a first inlet of which is connected to the second preheater (17), a first outlet of which is connected to the second inlet of the chemical machine (2), the steam generator (18) being used to heat the fluid to obtain steam and introduce the steam into the chemical machine (2); a pressure reducer (19), the inlet of which is connected to the second outlet of the steam generator (18), for reducing the pressure of the fluid after cooling; A three-phase separator (20), the inlet of which is connected to the outlet of the pressure reducer (19), the first outlet of the three-phase separator (20) is connected to the second inlet of the filter press (24), the second outlet of the three-phase separator (20) is connected to the pulping machine (11), and the three-phase separator (20) is used to separate the fluid after pressure reduction and send part of the aqueous phase product to the pulping machine (11); The inlet of the water softener (22) is connected to the third outlet of the three-phase separator (20), and the outlet of the water softener (22) is connected to the second inlet of the steam generator (18).

8. The rural garbage harmless collaborative treatment system with comprehensive energy utilization according to claim 6 is characterized in that: The wet straw processing module includes: A third crusher (10), the first outlet of which is connected to the pulper (11), the third crusher (10) being used to crush the straw and to feed the plant tissue fluid obtained by crushing into the pulper (11); A second dryer (23), the inlet of which is connected to the second outlet of the third crusher (10), for drying the crushed straw; A shaping machine (8), the inlet of which is connected to the outlet of the second drying machine (23), for shaping the dried straw into segments; The heating boiler (13) has an inlet connected to the outlet of the forming machine (8) and is used to burn part of the biomass pellets. The outlet of the heating boiler (13) is respectively connected to the first preheater (16), the first dryer (5), and the second dryer (23).

9. A method for harmless coordinated treatment of rural garbage with comprehensive energy utilization, characterized in that: The system according to any one of claims 1 to 8 comprises the following steps: The dead livestock and poultry are crushed and subjected to high-temperature chemical treatment to obtain animal tissue fluid, animal fat, steam and oil-containing solid phase residue, the animal fat and oil-containing solid phase residue are squeezed to obtain an oil-water mixture and a meat and bone meal product, the steam is condensed to obtain condensed water, and the oil-water mixture is then separated to obtain an animal fat product and water; Domestic waste is sorted and crushed, and the crushed product is mixed with animal tissue fluid, condensed water, and separated water obtained from the dead livestock and poultry processing module to obtain an aqueous slurry. The aqueous slurry is pressurized and preheated, and then subjected to a hydrothermal carbonization reaction to obtain hydrothermal carbon and a liquid phase product. The hydrothermal carbon is then subjected to pressure reduction, filter pressing, and drying to obtain a hydrothermal carbon product. The liquid phase product generated by the domestic waste hydrothermal carbonization treatment module is pressurized, heated, mixed with oxygen, and then subjected to supercritical water oxidation reaction to obtain a fluid with a certain temperature. The fluid is used to heat the liquid phase product and provide heat for high-temperature treatment. The cooled fluid is depressurized and separated to obtain a solid phase residue, a water phase product, and a gas phase product. The solid phase residue is mixed with the hydrothermal carbon and filtered; The straw is crushed, dried and segmented in sequence to obtain biomass pellets. A portion of the biomass pellets is used for combustion to release heat, providing heat for straw drying, aqueous slurry preheating, and hydrothermal charcoal drying, and the other portion of the biomass pellets is used as the product.

10. The method for harmless coordinated treatment of rural garbage with comprehensive energy utilization according to claim 9, characterized in that: The water content of the aqueous slurry is 70% to 80%.

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