Energy-saving kitchen solid residue treatment system and process

Abstract

The application discloses an energy-saving kitchen solid residue treatment system and process, which comprises a hydrothermal reactor, a flash reactor, a material buffer tank, a filter press, a demulsifier, an oil-water separator, an MVR evaporator, a drying machine, a mixing granulator and a heat pump recovery system. The flash reactor is communicated with the hydrothermal reactor. The material buffer tank is communicated with the flash reactor. The filter press is communicated with the material buffer tank. The demulsifier is communicated with the material buffer tank. The oil-water separator is communicated with the demulsifier. The MVR evaporator is communicated with the oil-water separator and the filter press. The drying machine is communicated with the filter press and the MVR evaporator. The mixing granulator is communicated with the drying machine and the oil-water separator. The heat pump recovery system is communicated with the hydrothermal reactor, the flash reactor, the MVR evaporator and the drying machine. The application can improve the conveying efficiency, improve the dehydration efficiency, make the filter cloth easier to clean, improve the drying efficiency, reduce the energy consumption required for drying, and reduce pollution emission and resource waste.

Description

Technical Field

[0001] This application relates to the field of kitchen waste solid waste treatment technology, and in particular to an energy-saving kitchen waste solid waste treatment system and process. Background Technology

[0002] The main processes for treating kitchen waste solids include dewatering and drying. However, due to the high water and oil content, poor fluidity, and high viscosity of kitchen waste solids, they experience high resistance and slow transport during pipeline transportation, which can easily cause pipeline blockage. Furthermore, during filter press dewatering, the oil components in the kitchen waste solids can easily form an oil film that adheres to the filter cloth, easily clogging the pores of the filter cloth, resulting in low dewatering efficiency and difficulty in cleaning the filter cloth. In addition, the filtrate produced by filter press dewatering is directly discharged, which can easily cause pollution and waste of resources. Finally, existing drying methods have low drying efficiency, low energy utilization, and high energy consumption. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an energy-saving kitchen waste solid residue treatment system that can improve conveying efficiency, improve dewatering efficiency and make filter cloth easier to clean, improve drying efficiency, reduce energy consumption required for drying, and reduce pollution emissions and resource waste.

[0004] This application also proposes an energy-saving process for treating kitchen waste solids.

[0005] An energy-saving kitchen waste solids treatment system according to an embodiment of the first aspect of this application includes a hydrothermal reactor, a flash reactor, a material buffer tank, a filter press, a demulsifier, an oil-water separator, an MVR evaporator, a dryer, a mixing and granulating machine, and a heat pump recovery system. The hydrothermal reactor is used to add kitchen waste solids and to perform a hydrothermal reaction on the solids using heated steam to form a first solids. The flash reactor is connected to the hydrothermal reactor, and the pressure inside the flash reactor is lower than that inside the hydrothermal reactor. It is used to flash-decompose the first solids to form a second solids and flash steam. The material buffer tank is connected to the flash reactor and is used to precipitate and separate the second solids to form a supernatant and a third solids. The filter press is connected to the material buffer tank and is used to press-filter and dehydrate the third solids to form a fourth solids and filtrate. The demulsifier is connected to the material buffer tank and is used to demulsify the supernatant to form a demulsified liquid. The oil-water separator is connected to the demulsifier and is used to demulsify the oil-water separator. The liquid is separated into oil and wastewater. The MVR evaporator is connected to the oil-water separator and the filter press. It is used to evaporate the mixture of wastewater and filtrate by heating steam to form concentrated liquid and saturated steam. The dryer is equipped with an oven, which is connected to the filter press and the MVR evaporator. The dryer heats the oven with heating steam to form superheated steam inside the oven. The superheated steam dries the mixture of concentrated liquid and fourth solid residue to form dry material and saturated steam. The mixing granulator is connected to the dryer and the oil-water separator to mix the oil and dry material and manufacture organic products. The heat pump recovery system is connected to the hydrothermal reactor, the flash reactor, the MVR evaporator and the dryer. The heating steam forms first condensate after heat exchange. The heat pump recovery system is used to recover the first condensate, saturated steam and flash steam and make heating steam, which is then sent back to the hydrothermal reactor, the MVR evaporator and the dryer.

[0006] The energy-saving kitchen waste solids treatment system according to the embodiments of this application has at least the following beneficial effects:

[0007] In this application, before the kitchen waste is filtered by a filter press, a hydrothermal reactor and a flash reactor are used for flash evaporation to soften, refine, and increase the temperature of the kitchen waste, thereby improving its fluidity. Sedimentation in a material buffer tank removes most of the grease, reducing the oil content of the kitchen waste and solving the problems of poor fluidity and high viscosity. This improves the conveying efficiency of the kitchen waste and reduces the likelihood of clogging the conveying pipes. Furthermore, it solves the problem of grease forming an oil film that clogs the filter cloth, improving dewatering efficiency and making the filter cloth easier to clean. In addition, a heat pump recovery system recovers heat from the first condensate generated after heating steam heat exchange, the flash steam generated in the flash reactor, and the saturated steam generated from the evaporation of moisture in the material, maximizing energy utilization and significantly reducing system energy consumption. Furthermore, the heating steam generated by the heat pump recovery system heats the oven of the dryer, producing superheated steam. This superheated steam comes into direct contact with the mixture of concentrate and fourth solid residue. The heat pump recovery system also enables relative flow between the superheated steam and the mixture, significantly improving heat transfer and drying efficiency. Combined with the heat pump recovery system, this substantially reduces the energy consumption required for drying. In addition, the wastewater from oil-water separation and the filtrate from pressure filtration are evaporated in an MVR evaporator to form a concentrate, which is used to manufacture dry materials. The oils from oil-water separation are mixed with the dry materials and used to manufacture organic products, reducing pollution and resource waste caused by the indiscriminate discharge of wastewater, filtrate, and oils.

[0008] According to some embodiments of this application, the heat pump recovery system includes a Freon heat pump and a steam compressor. The Freon heat pump is used to recover the heat of the first condensate and produce low-pressure steam. The first condensate is cooled to form a second condensate. The steam compressor is used to pressurize the low-pressure steam, flash steam, and saturated steam to form heating steam.

[0009] According to some embodiments of this application, the heat pump recovery system is connected to the filter press to introduce second condensate into the filter press to clean the filter cloth of the filter press.

[0010] According to some embodiments of this application, the energy-saving kitchen waste treatment system further includes a medium water tank. The heat pump recovery system and the filter press are both connected to the medium water tank. The medium water tank is used to add alkaline agents after the second condensate is input to form cleaning water, which is used to clean the filter cloth.

[0011] According to some embodiments of this application, the hydrothermal reactor is provided with a stirring chamber for loading kitchen waste solids, and a stirrer is provided in the stirring chamber for stirring the kitchen waste solids.

[0012] According to some embodiments of this application, the hydrothermal reactor is provided with a jacket located on the periphery of the stirring chamber, and the heat pump recovery system is connected to the jacket to receive the first condensate in the jacket and to supply heating steam into the jacket.

[0013] According to some embodiments of this application, the MVR evaporator includes a heating tube, a preheater, and a separation section. The heating tube connects the preheater and the separation section. The preheater is supplied with a mixture of wastewater and filtrate. Heating steam sequentially heats the heating tube and the preheater. After the mixture of wastewater and filtrate is preheated by the preheater and heated by the heating tube, it is separated by the separation section to form a concentrated liquid and saturated steam.

[0014] According to some embodiments of this application, the drying machine is equipped with a heat exchanger, which is located inside the drying oven. Heating steam enters the heat exchanger to exchange heat with the inside of the drying oven, thereby forming superheated steam inside the drying oven.

[0015] According to some embodiments of this application, the energy-saving kitchen waste solids treatment system further includes a material pump, which is located between the material buffer tank and the filter press for pumping a third solids into the filter press.

[0016] According to the energy-saving kitchen waste solid waste treatment process of the second aspect embodiment of this application, and the energy-saving kitchen waste solid waste treatment system based on the first aspect embodiment of this application, it includes:

[0017] The kitchen waste solids are transported to the hydrothermal reactor, and the kitchen waste solids are subjected to a hydrothermal reaction by heating steam to form the first solids.

[0018] The first solid residue is conveyed to the flash reactor for flash evaporation and cell wall breaking to form the second solid residue and flash steam.

[0019] The second solid residue is conveyed to the material buffer tank for sedimentation and separation to form supernatant and third solid residue;

[0020] The third solid residue is conveyed to the filter press for dewatering to form the fourth solid residue and filtrate.

[0021] The supernatant is conveyed to the demulsifier to demulsify and form a demulsified liquid, and the demulsified liquid is conveyed to the oil-water separator to separate oil and wastewater;

[0022] The filtrate and wastewater are fed to the MVR evaporator, where the mixture of wastewater and filtrate is evaporated by heating steam to form a concentrated liquid and saturated steam.

[0023] The concentrate and the fourth solid residue are transported to the drying oven, and the drying oven is heated by heating steam to form superheated steam inside the drying oven. The superheated steam dries the mixture of concentrate and fourth solid residue to form dry material and saturated steam.

[0024] Oils and dry materials are fed into a mixing and granulating machine for mixing and manufacturing organic products;

[0025] The heating steam is used to form first condensate after heat exchange. The heat pump recovery system is used to recover the first condensate, saturated steam and flash steam and make heating steam, which is then transported back to the hydrothermal reactor, the MVR evaporator and the dryer.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0027] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 A schematic diagram of the overall structure of an energy-saving kitchen waste solids treatment system;

[0029] Figure 2 This is a schematic diagram of the operation of an MVR evaporator;

[0030] Figure 3 This is a schematic diagram of the drying machine's operation.

[0031] Figure 4 This is a schematic diagram of the operation of a heat pump recovery system;

[0032] Figure 5 This is a schematic diagram of the hydrothermal reactor.

[0033] Icon labels:

[0034] Hydrothermal reactor 100; stirring chamber 101; mixer 102; jacket 103;

[0035] Flash reactor 200;

[0036] Material buffer tank 300;

[0037] Filter press 400;

[0038] Breast depressant 500;

[0039] Oil-water separator 600;

[0040] MVR evaporator 700; heating element 701; preheater 702; separation section 703; evaporator body 704;

[0041] Drying machine 800; Oven 801; Heat exchanger 802;

[0042] Mixing and granulating machine 900; mixing mechanism 901; granulating mechanism 902;

[0043] Heat pump recovery system 1000; Freon heat pump 1001; Steam compressor 1002;

[0044] Medium water tank 1100;

[0045] Material pump 1200;

[0046] Waste liquid buffer tank 1300;

[0047] Waste liquid pump 1400;

[0048] Cleaning pump 1500;

[0049] Oil pump 1600;

[0050] 10. Kitchen solids; 11. Heating steam; 12. First solids; 13. First condensate; 14. Second solids; 15. Flash steam; 16. Supernatant; 17. Third solids; 18. Fourth solids; 19. Filtrate; 20. Demulsifier; 21. Oil; 22. Wastewater; 23. Concentrate; 24. Dry material; 25. Organic product; 26. Saturated steam; 27. Second condensate; 28. Low-pressure steam; 29. ​​Washing water. Detailed Implementation

[0051] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0052] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or the order in which the technical features are indicated.

[0054] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0055] The following is for reference. Figures 1 to 5 This application describes an energy-saving kitchen waste solid residue treatment system and process according to embodiments of the present application.

[0056] like Figures 1 to 5 As shown, the energy-saving kitchen waste solid residue treatment system according to the first aspect of this application includes a hydrothermal reactor 100, a flash reactor 200, a material buffer tank 300, a filter press 400, a demulsifier 500, an oil-water separator 600, an MVR evaporator 700, a dryer 800, a mixing and granulating machine 900, and a heat pump recovery system 1000.

[0057] The hydrothermal reactor 100 is used to add kitchen solids 10 and to perform a hydrothermal reaction on the kitchen solids 10 by heating steam 11 to form the first solids 12.

[0058] The flash reactor 200 is connected to the hydrothermal reactor 100. The pressure inside the flash reactor 200 is lower than the pressure inside the hydrothermal reactor 100. It is used to flash break the first solid slag 12 to form the second solid slag 14 and flash steam 15.

[0059] The material buffer tank 300 is connected to the flash reactor 200 and is used to precipitate and separate the second solid residue 14 to form the supernatant 16 and the third solid residue 17.

[0060] The filter press 400 is connected to the material buffer tank 300 and is used to filter and dewater the third solid residue 17 to form the fourth solid residue 18 and the filtrate 19.

[0061] The demulsifier 500 is connected to the material buffer tank 300 and is used to demulsify the supernatant 16 to form demulsified liquid 20.

[0062] The oil-water separator 600 is connected to the demulsifier 500 and is used to separate the demulsifier 20 into grease 21 and wastewater 22.

[0063] The MVR evaporator 700 connects to the oil-water separator 600 and the filter press 400, and is used to evaporate the mixture of wastewater 22 and filtrate 19 by heating steam 11 to form concentrated liquid 23 and saturated steam 26.

[0064] The dryer 800 is equipped with an oven 801, which is connected to the filter press 400 and the MVR evaporator 700. The dryer 800 heats the oven 801 with heating steam 11 to form superheated steam inside the oven 801. The superheated steam dries the mixture of concentrated liquid 23 and fourth solid residue 18 to form dry material 24 and saturated steam 26.

[0065] The mixing granulator 900 is connected to the dryer 800 and the oil-water separator 600 to mix the oil 21 and the dry material 24 and produce an organic product 25.

[0066] The heat pump recovery system 1000 connects the hydrothermal reactor 100, the flash reactor 200, the MVR evaporator 700, and the dryer 800;

[0067] The heating steam 11 in the hydrothermal reactor 100, the heating steam 11 in the MVR evaporator 700, and the heating steam 11 in the dryer 800 exchange heat to form the first condensate 13. The heat pump recovery system 1000 is used to recover the first condensate 13, flash steam 15, and saturated steam 26 and make them into heating steam 11, which is then transported back to the hydrothermal reactor 100, the MVR evaporator 700, and the dryer 800.

[0068] In this application, before the kitchen solid residue 10 is filtered by the filter press 400, the kitchen solid residue 10 is softened, refined and heated by the hydrothermal reactor 100 and flash evaporation reactor 200, which improves the fluidity of the kitchen solid residue 10. The sedimentation treatment in the material buffer tank 300 can remove most of the grease 21, reduce the oil content of the kitchen solid residue 10, solve the problem of poor fluidity and high viscosity of the kitchen solid residue 10, improve the conveying efficiency of the kitchen solid residue 10 and prevent the conveying pipeline from clogging. Secondly, it also solves the problem that the grease 21 easily forms an oil film and clogs the filter cloth, improves the dewatering efficiency and makes it easier to clean the filter cloth. Furthermore, the heat pump recovery system 1000 can recover the heat from the first condensate 13 generated after heat exchange with the heating steam 11 in the hydrothermal reactor 100, MVR evaporator 700, and dryer 800, as well as the heat from the flash steam 15 generated in the flash reactor 200 and the saturated steam 26 generated by material evaporation, maximizing energy utilization and significantly reducing system energy consumption. In addition, the heating steam 11 generated by the heat pump recovery system 1000 heats the oven 801 of the dryer 800, generating superheated steam within the oven 801. This superheated steam comes into direct contact with the mixture of concentrate 23 and fourth solid slag 18. Through the action of the heat pump recovery system 1000, relative flow occurs between the superheated steam and the mixture, significantly improving heat transfer efficiency and drying efficiency. Combined with the heat pump recovery system 1000, the energy consumption required for drying can be greatly reduced. In addition, the wastewater 22 generated from oil-water separation and the filtrate 19 generated from pressure filtration are evaporated by MVR evaporator 700 to form concentrated liquid 23, which is used to manufacture dry material 24. The oil 21 generated from oil-water separation is mixed with dry material 24 and used to manufacture organic product 25, which can reduce the pollution and resource waste caused by the random discharge of wastewater 22, filtrate 19 and oil 21.

[0069] Furthermore, the entire system of this application can reduce the moisture content of kitchen solid residue 10 from a high level to a low level, for example, from 75%-80% to below 10%. The dry material 24 has a low moisture content, is stable after high-temperature sterilization, is not prone to spoilage, is easy to transport and store, and can significantly reduce subsequent processing costs.

[0070] Furthermore, the entire system of this application is highly efficient and energy-saving, achieving near-zero emissions of wastewater 22, waste gas, and waste residue, making it more energy-saving and environmentally friendly, and providing a valid basis for the resource-based treatment of kitchen solid residue 10.

[0071] It should be noted that, since the mixture of wastewater 22 and filtrate 19, as well as the mixture of concentrate 23 and fourth solid residue 18, has a high water content, saturated steam 26 will be generated after heating and evaporation by heating steam 11.

[0072] The following is a detailed description of each component of the energy-saving kitchen waste treatment system of this application.

[0073] refer to Figure 4 As shown, in some embodiments of this application, the heat pump recovery system 1000 includes a Freon heat pump 1001 and a steam compressor 1002. The Freon heat pump 1001 is used to recover heat from the first condensate 13 and produce low-pressure steam 28. The temperature of the first condensate 13 is approximately 100°C. After the first condensate 13 absorbs heat from the Freon heat pump 1001, it is cooled to form second condensate 27. The temperature of the second condensate 27 is approximately 60°C. The steam compressor 1002 is used to pressurize the low-pressure steam 28, flash steam 15, and saturated steam 26 to form heating steam 11. For example, after the Freon heat pump 1001 recovers the heat from the first condensate 13, the pressure of the low-pressure steam 28 produced can be 0.095 to 0.1 MPa, and the temperature can be 80 to 100°C. The low-pressure steam 28, flash steam 15, and saturated steam 26 are pressurized by the steam compressor 1002 to increase their pressure and temperature, resulting in high-temperature and high-pressure steam. For example, the pressure of the high-temperature and high-pressure steam can be 0.2 to 1.0 MPa, and the temperature can be 130 to 200°C, with an increased enthalpy. Subsequently, the high-temperature and high-pressure steam is sent back into the hydrothermal reactor 100, the MVR evaporator 700, and the dryer 800. After losses along the way, it forms heating steam 11 as a heating medium, realizing energy recycling.

[0074] refer to Figure 5 As shown, in some embodiments of this application, the hydrothermal reactor 100 is provided with a stirring chamber 101, which is used to load kitchen solids 10, and a mixer 102 is provided in the stirring chamber 101 to stir the kitchen solids 10.

[0075] In this embodiment, the kitchen solid residue 10 is stirred by the mixer 102, which can make the kitchen solid residue 10 softer and finer, further reduce the viscosity of the kitchen solid residue 10, and further improve the fluidity of the kitchen solid residue 10.

[0076] It should be noted that the reference Figure 1 As shown, the kitchen waste slag 10 can be transported to the stirring chamber 101 of the hydrothermal reactor 100 by conveying equipment such as screw conveyor, scraper conveyor, slurry pump or screw pump. The first solid slag 12 formed after the hydrothermal reaction can be discharged from the bottom of the hydrothermal reactor 100.

[0077] refer to Figure 5As shown, in some embodiments of this application, the hydrothermal reactor 100 is provided with a jacket 103, which is located around the stirring chamber 101. The heat pump recovery system 1000 is connected to the jacket 103 to receive the first condensate 13 in the jacket 103 and to supply heating steam 11 into the jacket 103. For example, the high-temperature and high-pressure steam generated by the heat pump recovery system 1000, after losses along the way, forms the heating steam 11. The pressure can be approximately 0.1 to 1.0 MPa, and the temperature can be approximately 100 to 200°C. The heating steam 11 is supplied to the jacket 103, where it heats the kitchen waste slag 10 and then cools to form the first condensate 13. The first condensate 13 re-enters the Freon heat pump 1001 of the heat pump recovery system 1000 for heat recovery, achieving the first energy cycle.

[0078] In this embodiment, a jacket 103 is provided to heat the kitchen solid slag 10 more evenly and with better heating effect. In addition, compared with direct contact with the kitchen solid slag 10, it can avoid excessive impurities in the first condensate 13.

[0079] Of course, in some other embodiments of this application, the heating steam 11 may also directly contact the kitchen waste residue 10.

[0080] refer to Figure 1 As shown, in some embodiments of this application, the flash reactor 200 is connected to the hydrothermal reactor 100, and the pressure inside the flash reactor 200 is lower than the pressure inside the hydrothermal reactor 100, which is used to flash-break the first solid slag 12 to form a second solid slag 14 and flash steam 15.

[0081] In this embodiment, the first solid slag 12 produced after the reaction in the hydrothermal reactor 100 is transported to the flash reactor 200 through a pipeline for further reaction. Since the pressure inside the flash reactor 200 is lower than that inside the hydrothermal reactor 100, the boiling point of the liquid is also lower. When the liquid temperature exceeds the boiling point at this pressure, the liquid rapidly boils and vaporizes, forming flash steam 15. The pressure of the flash steam 15 can be 0.095 to 0.1 MPa, and the temperature can be 80 to 100°C. The boiling of the liquid and the formation of the flash steam 15 enable rapid cell wall disruption of the material in the first solid slag 12, accelerating the softening and refining of the first solid slag 12, and further improving the fluidity of the first solid slag 12.

[0082] Flash steam 15 is discharged from the top of flash reactor 200 and enters heat pump recovery system 1000. After impurity removal and filtration to remove impurities and non-condensable gases, it is pressurized by steam compressor 1002, increasing its pressure, temperature, and enthalpy. It is then used as heating steam 11 and reintroduced into hydrothermal reactor 100, MVR evaporator 700, and dryer 800 as a heating medium, achieving a second energy cycle. Secondary solid slag 14 can be discharged from the bottom of flash reactor 200.

[0083] refer to Figure 1 As shown in some embodiments of this application, the second solid residue 14 after the reaction in the flash reactor 200 is transported through a pipeline to the material buffer tank 300 for sedimentation separation. The supernatant 16 produced by the sedimentation separation is sent to a demulsifier 500, such as an ultrasonic demulsifier, to form a demulsified liquid 20. The demulsified liquid 20 then enters the oil-water separator 600 to separate grease 21 and wastewater 22. The wastewater 22 can enter the waste liquid buffer tank 1300 for buffering. The third solid residue 17 produced by the sedimentation separation can be discharged from the bottom of the material buffer tank 300.

[0084] In this embodiment, a material buffer tank 300 is provided to allow for sedimentation and separation of the second solid residue 14, removing most of the oil components and reducing the oil content of the kitchen solid residue 10. This prevents excessive grease 21 from forming an oil film and clogging the filter cloth when it enters the filter press 400, thus improving dewatering efficiency and making the filter cloth easier to clean. Furthermore, the demulsifier 500 and oil-water separator 600 perform oil-water separation, collecting the grease 21 and preventing its indiscriminate discharge, which could cause pollution and resource waste.

[0085] refer to Figure 1 As shown, in some embodiments of this application, the filter press 400 is connected to the material buffer tank 300 for dewatering the third solid residue 17 to form a fourth solid residue 18 and filtrate 19. The filter press 400 can be a fully automatic plate and frame filter press or other suitable filter press 400. The filter press 400 dewaters the third solid residue 17 to form the fourth solid residue 18 and filtrate 19. The filtrate 19 can enter the waste liquid buffer tank 1300 for buffering. The moisture content of the dewatered fourth solid residue 18 is significantly reduced, for example, to below 60%, to facilitate subsequent drying treatment.

[0086] refer to Figure 1 As shown in some embodiments of this application, the energy-saving kitchen waste solid residue treatment system further includes a material pump 1200, which is located between the material buffer tank 300 and the filter press 400 to pump the third solid residue 17 into the filter press 400. The material pump 1200 facilitates the delivery of the third solid residue 17 to the filter press 400, improving material delivery efficiency and reducing pipe blockage.

[0087] refer to Figure 2 As shown, in some embodiments of this application, the MVR evaporator 700 includes a heating tube 701, a preheater 702, and a separation section 703. The heating tube 701 connects the preheater 702 and the separation section 703. The preheater 702 is supplied with a mixture of wastewater 22 and filtrate 19. The heating steam 11 heats the heating tube 701 and the preheater 702 in sequence to form first condensate 13. After the mixture of wastewater 22 and filtrate 19 is preheated by the preheater 702 and heated by the heating tube 701, it is separated by the separation section 703 to form concentrated liquid 23 and saturated steam 26.

[0088] For example, the mixture of wastewater 22 and filtrate 19 in the waste liquid buffer tank 1300 can be pumped by the waste liquid pump 1400 to the preheater 702 of the MVR evaporator 700, and then enters the evaporator body 704 formed by the coiled heating tubes 701. High-speed flow is achieved by a circulation pump or the like to prevent scaling inside the heating tubes 701. The heating steam 11 generated by the heat pump recovery system 1000 heats the evaporator body 704 formed by the heating tubes 701 and the preheater 702 in sequence. After the mixture of wastewater 22 and filtrate 19 is preheated by the preheater 702 and heated by the heating tubes 701, it enters the separation section 703 to separate the concentrate 23 from the saturated steam 26. The separation section 703 can be a flash evaporator or other suitable separation mechanism.

[0089] Due to the high flow velocity within the heating tube 701, the mixture of wastewater 22 and filtrate 19 forms strong turbulence, significantly improving heat transfer efficiency. The saturated steam 26 generated from the evaporation of the wastewater 22 and filtrate 19, and the first condensate 13 generated after heat exchange between the heating steam 11 in the MVR evaporator 700 and the heating tube 701 and preheater 702, re-enter the heat pump recovery system 1000 to achieve heat energy recovery and utilization. The first condensate 13 first uses the Freon heat pump 1001 to recover heat energy and produce low-pressure steam 28, which is then compressed with the saturated steam 26 by the steam compressor 1002, increasing its pressure, temperature, and enthalpy. Subsequently, it is used as heating steam 11 and reintroduced into the MVR evaporator 700 as a heating medium, achieving a third energy cycle.

[0090] refer to Figure 3As shown, in some embodiments of this application, the dryer 800 is equipped with an oven 801, which is connected to the filter press 400 and the MVR evaporator 700. The dryer 800 heats the oven 801 with heating steam 11 to form superheated steam inside the oven 801. The superheated steam dries the mixture of concentrated liquid 23 and fourth solid slag 18 to form dry material 24 and saturated steam 26. For example, the oven 801 is used to receive the mixture of concentrated liquid 23 and fourth solid slag 18. The dryer 800 may also be equipped with a heat exchanger 802, which is located inside the oven 801. The heating steam 11 enters the heat exchanger 802 to exchange heat with the material inside the oven 801, causing the moisture in the material inside the oven 801 to evaporate and form superheated steam.

[0091] The fourth solid residue 18 produced after filtration by filter press 400 and the concentrated liquid 23 produced by MVR evaporator 700 enter the drying oven 801 of dryer 800 for drying. Heating steam 11 generated by heat pump recovery system 1000 enters heat exchanger 802 to exchange heat with the drying oven 801, forming superheated steam within the oven 801. The pressure of the superheated steam can be 0.1 MPa, and the temperature can be above 105℃. The superheated steam directly contacts the mixture of concentrated liquid 23 and fourth solid residue 18, performing circulating convection drying, which significantly improves drying efficiency compared to traditional dryers 800. The material stays in the drying oven 801 of dryer 800 for a preset time, ensuring thorough sterilization. The moisture content can be reduced to 10% or other suitable values, resulting in stable properties that can be stored for a long time, facilitating transportation and storage.

[0092] Furthermore, the first condensate 13 generated after heat exchange of the heating steam 11 in the dryer 800, and the saturated steam 26 formed by the evaporation of the mixture of the concentrate 23 and the fourth solid slag 18 in the oven 801, enter the heat pump recovery system 1000. After impurity removal and filtration, the first condensate 13 is used to recover heat energy and produce low-pressure steam 28 by the Freon heat pump 1001. The low-pressure steam 28 and the saturated steam 26 are compressed together by the steam compressor 1002 to increase their pressure and temperature and increase their enthalpy. Then, it is sent back to the dryer 800 as heating steam 11 as a heating medium to realize the fourth energy cycle.

[0093] refer to Figure 1 As shown, in some embodiments of this application, the heat pump recovery system 1000 is connected to the filter press 400. The first condensate 13 is cooled by the Freon heat pump 1001 to form the second condensate 27. The second condensate 27 is introduced into the filter press 400 to clean the filter cloth of the filter press 400.

[0094] In this embodiment, the first condensate 13 generated after heat exchange with the heating steam 11 is first exchanged with the Freon heat pump 1001 to produce low-pressure steam 28. After heat exchange, the first condensate 13 is cooled to form second condensate 27, the temperature of which is approximately 60°C. The second condensate 27 is introduced into the filter press 400 to clean the filter cloth, achieving water recycling. This not only avoids the indiscriminate discharge of the second condensate 27 and environmental pollution, but also reduces resource waste. Furthermore, no additional water is required. In addition, the higher temperature of the second condensate 27 improves the oil and dirt removal effect of rinsing the filter cloth compared to cold water cleaning, and the heat in the second condensate 27 is utilized, resulting in greater energy savings.

[0095] refer to Figure 1 As shown in some embodiments of this application, the energy-saving kitchen waste solids treatment system further includes a medium water tank 1100. The heat pump recovery system 1000 and the filter press 400 are both connected to the medium water tank 1100. After the second condensate 27 enters the medium water tank 1100, an alkaline agent is added to form cleaning water 29, which cleans the filter cloth. For example, the cleaning water 29 can be pumped into the filter press 400 by the cleaning pump 1500 to clean the filter cloth.

[0096] The second condensate 27, after being added to an alkaline agent, forms cleaning water 29, which can undergo a saponification reaction with the oil on the filter cloth to further improve the cleaning effect.

[0097] refer to Figure 1 As shown in some embodiments of this application, the mixing and granulating machine 900 may include a mixing mechanism 901 and a granulating mechanism 902. Oil 21 can be pumped into the mixing mechanism 901 via an oil pump 1600, where it mixes the oil 21 with the dry material 24. The mixture is then conveyed to the granulating mechanism 902, which manufactures an organic product 25. The organic product 25 may be biomass fuel rods, organic fertilizer, feed, or other suitable organic products. Furthermore, the oil 21 can also be recycled separately, which will not be elaborated further here.

[0098] According to the energy-saving kitchen waste solid waste treatment process of the second aspect embodiment of this application, the energy-saving kitchen waste solid waste treatment system based on the first aspect embodiment above includes the following steps:

[0099] The kitchen solid slag 10 is transported to the hydrothermal reactor 100, and the kitchen solid slag 10 is subjected to a hydrothermal reaction by heating steam 11 to form the first solid slag 12.

[0100] The first solid slag 12 is conveyed to the flash reactor 200 for flash evaporation and cell wall breaking to form the second solid slag 14 and flash steam 15;

[0101] The second solid residue 14 is conveyed to the material buffer tank 300 for sedimentation and separation to form the supernatant 16 and the third solid residue 17.

[0102] The third solid residue 17 is conveyed to the filter press 400 for filter pressing and dewatering to form the fourth solid residue 18 and filtrate 19;

[0103] The supernatant 16 is sent to the demulsifier 500 to demulsify and form demulsified liquid 20, and the demulsified liquid 20 is sent to the oil-water separator 600 to separate and form grease 21 and wastewater 22.

[0104] The filtrate 19 and wastewater 22 are fed to the MVR evaporator 700, where the mixture of wastewater 22 and filtrate 19 is evaporated by heating steam 11 to form concentrated liquid 23 and saturated steam 26.

[0105] The concentrate 23 and the fourth solid slag 18 are conveyed to the drying oven 801. The drying oven 801 is heated by the heating steam 11 to form superheated steam inside the drying oven 801. The superheated steam dries the mixture of concentrate 23 and fourth solid slag 18 to form dry material 24 and saturated steam 26.

[0106] Oil 21 and dry material 24 are fed to mixing and granulation machine 900 for mixing and manufacturing organic product 25.

[0107] In this process, the heating steam 11 is heated to form the first condensate 13. The heat pump recovery system 1000 is used to recover the first condensate 13, saturated steam 26 and flash steam 15 and make heating steam 11, which is then transported back to the hydrothermal reactor 100, the MVR evaporator 700 and the dryer 800.

[0108] Since the process can adopt all the technical solutions of the energy-saving kitchen solid slag treatment system of the first aspect embodiment described above, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment described above. These additional beneficial effects will not be elaborated here.

[0109] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. An energy-saving kitchen waste solids treatment system, characterized in that, The application relates to a kitchen solid residue treatment system. The system comprises: a hydrothermal reactor for adding kitchen solid residue and performing hydrothermal reaction on the kitchen solid residue by heating steam to form first solid residue; a flash reactor in communication with the hydrothermal reactor, the pressure in the flash reactor being lower than that in the hydrothermal reactor, for performing flash breaking of the cell walls of the first solid residue to form second solid residue and flash steam; a material buffer tank in communication with the flash reactor, for performing sedimentation separation on the second solid residue to form supernatant and third solid residue; a filter press in communication with the material buffer tank, for performing pressure filtration dewatering on the third solid residue to form fourth solid residue and filtrate; a demulsifier in communication with the material buffer tank, for performing demulsification on the supernatant to form demulsified liquid; an oil-water separator in communication with the demulsifier, for separating the demulsified liquid to form grease and waste water; an MVR evaporator in communication with the oil-water separator and the filter press, for performing evaporation on the mixture of the waste water and the filtrate by heating steam to form concentrated liquid and saturated steam; a drying machine provided with an oven, the oven being in communication with the filter press and the MVR evaporator, the drying machine heating the oven by heating steam to form superheated steam in the oven, and the superheated steam performing drying on the mixture of the concentrated liquid and the fourth solid residue to form dry material and saturated steam; a mixing granulator in communication with the drying machine and the oil-water separator, for mixing the grease and the dry material and manufacturing organic products; a heat pump recovery system in communication with the hydrothermal reactor, the flash reactor, the MVR evaporator and the drying machine; wherein heating steam is exchanged to form first condensed water, the heat pump recovery system is used for recovering the first condensed water, the saturated steam and the flash steam to form heating steam, which is delivered to the hydrothermal reactor, the MVR evaporator and the drying machine again; the heat pump recovery system comprises: a freon heat pump for recovering the heat of the first condensed water to form low-pressure steam, and the first condensed water is cooled to form second condensed water; 2. The energy-saving kitchen solid residue processing system according to claim 1, characterized in that, a steam compressor for pressurizing the low-pressure steam, the flash steam and the saturated steam to form heating steam.

3. The energy-saving kitchen solid residue processing system according to claim 2, characterized in that, The heat pump recovery system is in communication with the filter press, so that the second condensed water is delivered into the filter press to clean the filter cloth of the filter press. The system further comprises:

4. The energy-saving kitchen solid residue processing system according to claim 1, characterized in that, a reclaimed water tank, the heat pump recovery system and the filter press being in communication with the reclaimed water tank, the reclaimed water tank being used for adding alkaline reagent to the second condensed water to form cleaning water, which is used for cleaning the filter cloth.

5. The energy-saving kitchen solid residue processing system according to claim 4, characterized in that, The hydrothermal reactor is provided with a stirring cavity for loading kitchen solid residue, and a stirrer is arranged in the stirring cavity to stir the kitchen solid residue. The hydrothermal reactor is provided with a jacket on the periphery of the stirring cavity, and the heat pump recovery system is in communication with the jacket to receive the first condensed water in the jacket and deliver heating steam into the jacket.

6. The energy-saving kitchen solid residue processing system according to claim 1, characterized in that, The MVR evaporator comprises a heating pipe, a preheater and a separation part, the heating pipe is communicated with the preheater and the separation part, the preheater is used for entering the mixed solution of wastewater and filtrate, heating steam is used for sequentially heating the heating pipe and the preheater, after the mixed solution of wastewater and filtrate is preheated by the preheater and heated by the heating pipe, the mixed solution is separated by the separation part to form concentrated solution and saturated steam.

7. The energy-saving kitchen solid residue processing system according to claim 1, characterized in that, The drying machine is provided with a heat exchanger, the heat exchanger is arranged in the oven, heating steam enters the heat exchanger to exchange heat with the oven, and superheated steam is formed in the oven.

8. The energy-saving kitchen solid residue processing system according to claim 1, characterized in that, Further comprising: A material pump is arranged between the material buffer tank and the filter press, and is used for pumping the third solid residue into the filter press.

9. An energy-saving kitchen solid residue treatment process based on the energy-saving kitchen solid residue treatment system according to any one of claims 1 to 8, characterized by, Comprise: The kitchen solid residue is transported to the hydrothermal reactor, and the kitchen solid residue is subjected to hydrothermal reaction by heating steam to form first solid residue; The first solid residue is transported to the flash evaporation reactor, and is subjected to flash evaporation to form second solid residue and flash evaporation steam; The second solid residue is transported to the material buffer tank, and is subjected to sedimentation separation to form supernatant and third solid residue; The third solid residue is transported to the filter press to perform filter pressing and dewatering to form fourth solid residue and filtrate; The supernatant is transported to the demulsifier to perform demulsification to form demulsified liquid, and the demulsified liquid is transported to the oil-water separator to separate to form grease and wastewater; The filtrate and the wastewater are transported to the MVR evaporator, and the mixed solution of the wastewater and the filtrate is evaporated by heating steam to form concentrated solution and saturated steam; The concentrated solution and the fourth solid residue are transported to the oven, the oven is heated by heating steam to form superheated steam in the oven, and the mixture of the concentrated solution and the fourth solid residue is dried by the superheated steam to form dry material and saturated steam; The grease and the dry material are transported to the mixing granulator to perform mixing and manufacturing to form organic products; Wherein, the heating steam is exchanged to form first condensed water, the heat pump recovery system is used for recovering the first condensed water, the saturated steam and the flash evaporation steam to make heating steam, and the heating steam is transported to the hydrothermal reactor, the MVR evaporator and the drying machine again; The freon heat pump recovers heat of the first condensed water to make low-pressure steam, and the first condensed water is cooled to form second condensed water; The steam compressor pressurizes the low-pressure steam, the flash evaporation steam and the saturated steam to form heating steam.

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