Device for promoting separation of organic matters in kitchen waste fine residues

Abstract

The invention belongs to the technical field of kitchen waste fine residue disposal, and particularly discloses a device for promoting kitchen waste fine residue organic matter precipitation, the device comprises a rack and a stirring tank, the top of the stirring tank is provided with a feed port, and the bottom of the stirring tank is provided with a discharge port; a discharging hopper used for temporarily storing materials is arranged on the portion, below the discharging opening, of the machine frame. A stirring assembly is arranged in the stirring tank; a heating assembly and a cooling assembly are arranged on the inner wall of the stirring tank, and the heating assembly is used for conducting short-term high-temperature heating on materials in the stirring tank. The short-term high-temperature pretreatment can inhibit microorganisms from converting nitrogen into nitrogen, so that the loss of nutrient elements such as nitrogen is reduced, more nitrogen elements are reserved in the kitchen waste fine residues, the organic matter degradation rate is increased, organic matter degradation is promoted, the compost maturing process is accelerated, and odor emission is reduced; in addition, the kitchen waste fine residues strengthen and destroy organic matter macromolecule strengthening under the action of alternate cooling and heating, humus precipitation is promoted, the strengthening effect is achieved, and more nutrient elements are left.

Description

Technical Field

[0001] This invention relates to the field of kitchen waste residue treatment technology, and in particular to a device for promoting the precipitation of organic matter from kitchen waste residue. Background Technology

[0002] Kitchen waste refers to the waste generated in daily life, food processing, catering services, and unit catering activities. It includes discarded vegetable leaves, leftover food, fruit peels, eggshells, tea dregs, bones (chicken bones, fish bones, etc.), etc. Its main sources are family kitchens, restaurants, hotels, canteens, markets, and other industries related to food processing.

[0003] Food waste transported back to the waste-to-energy plant undergoes pretreatment processes such as crushing, screening, and oil extraction. This pretreatment produces fine organic food residue. Currently, there are three methods for treating food waste: 1. Sending the processed food residue to an anaerobic digestion unit for anaerobic digestion to achieve biogas resource utilization. However, this method generates large amounts of biogas slurry and solid biogas residue, increasing subsequent treatment costs. 2. Co-processing at a municipal solid waste incineration plant, where the processed food residue is fed into the incinerator for power generation. However, the high moisture content and low calorific value of the food residue reduce power generation efficiency after entering the incinerator. 3. Fermenting and composting the processed food residue. In summary, methods one and two are not ideal, and both waste the N and P nutrients in the kitchen waste residue, indicating significant room for improvement in resource utilization. Method three involves making compost from kitchen waste residue. However, the traditional composting method involves fermenting the kitchen waste residue with auxiliary materials without controlling the parameters during the fermentation process. This results in the ineffective release of organic matter from the kitchen waste residue, a significant loss of nutrients, and a reduction in the compost's effectiveness. Summary of the Invention

[0004] In order to address the technical problems of low compost efficacy caused by the ineffective extraction of organic matter and the significant loss of nutrients in the traditional process of composting from kitchen waste residue, this invention provides a device for promoting the extraction of organic matter from kitchen waste residue.

[0005] The technical solution adopted in this invention is as follows: A device for promoting the precipitation of organic matter from kitchen waste includes a frame, on which a mixing tank is mounted. The mixing tank has a U-shaped structure, with a feed inlet at the top and a first electric gate valve that can open and close the feed inlet. At the bottom of the mixing tank are a discharge outlet, a material gate that can open and close the discharge outlet, and a gate opening assembly for driving the opening and closing of the material gate. Below the discharge outlet, on the frame, is a hopper for temporarily storing materials, with a second electric gate valve for unloading materials at the bottom of the hopper. A mixing assembly for mixing materials is installed inside the mixing tank. A heating assembly is installed on the inner wall of the mixing tank to provide short-term high-temperature heating of the materials inside the mixing tank.

[0006] Furthermore, the heating component includes several electric heating plates spaced at certain intervals on the inner wall of the mixing tank. The heating time of the heating component is 3 to 5 hours, and the heating temperature of the heating component is 120°C to 140°C.

[0007] Furthermore, the inner wall of the mixing tank is equipped with a cooling component, which is used to rapidly cool the material inside the mixing tank; after the heating component has finished heating the material, the heating component is turned off and the cooling component is immediately started.

[0008] Furthermore, the cooling assembly includes several cooling pipes disposed on the inner wall of the mixing tank, the cooling pipes being arranged between adjacent electric heating plates, and the cooling pipes and electric heating plates being arranged alternately.

[0009] Furthermore, the stirring assembly also includes a second stirring shaft arranged side by side with the first stirring shaft, the first stirring shaft is provided with a first stirring blade, and one end of the first stirring shaft is connected to a first reduction motor for driving the first stirring shaft to rotate.

[0010] Furthermore, a second stirring shaft is arranged side by side with the first stirring shaft, and a second stirring blade is provided on the second stirring shaft. One end of the second stirring blade is connected to a second reduction motor for driving the second stirring shaft to rotate.

[0011] Furthermore, the opening assembly includes a hydraulic cylinder horizontally arranged on the frame below the material gate. The hydraulic cylinder is connected to a hydraulic station. A roller is provided at the end of the piston rod of the hydraulic cylinder. The side of the material gate near the hydraulic cylinder is hinged to the mixing tank. The roller is in rolling connection with the material gate. The material gate can be opened and closed by extending and retracting the hydraulic cylinder.

[0012] Furthermore, a discharge baffle is vertically installed on the side of the discharge port away from the hydraulic cylinder.

[0013] Furthermore, a feeding elevator is installed on the frame next to the mixing tank.

[0014] Furthermore, a thermometer is installed inside the mixing tank to monitor the temperature of the material inside the tank in real time; an exhaust pipe is installed on the top of the mixing tank, and the exhaust pipe is connected to an odor treatment device.

[0015] The beneficial effects of this invention are: 1. This invention provides a short-term high-temperature pretreatment of kitchen waste residue, which can sterilize, inactivate, and eliminate pathogens. High temperature helps to accelerate the degradation rate of organic matter, promote organic matter degradation, accelerate the composting process, and reduce odor emissions. Secondly, it can reduce the loss of nutrients such as nitrogen. Microorganisms convert nitrogen into nitrogen gas during nitrification and denitrification. Short-term high-temperature pretreatment can inhibit microorganisms from converting nitrogen into nitrogen gas, thereby reducing the loss of nutrients such as nitrogen and allowing more nitrogen to be retained in the kitchen waste residue, increasing the nutrition of the finished compost.

[0016] 2. This invention heats kitchen waste at high temperature and then rapidly cools it. The alternating hot and cold action strengthens the process of breaking down the polymer bonds of organic matter and promoting the release of humic substances, thus retaining more nutrients.

[0017] 3. The stirring assembly of the present invention adopts a dual-shaft mode, which can be matched with different stirring methods according to different material processing volumes, material types and different stages of materials, thereby improving the heating efficiency, cooling efficiency and unloading efficiency of materials. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention.

[0019] Figure 2 This is a side view of the present invention.

[0020] Figure 3 yes Figure 1 Top view.

[0021] Figure 4 This is a schematic diagram of the stirring method one of the stirring components of the present invention.

[0022] Figure 5 This is a schematic diagram of the stirring method two of the stirring assembly of the present invention.

[0023] Figure 6 This is a schematic diagram of the stirring method three of the stirring assembly of the present invention.

[0024] Figure 7 This is a graph showing the trend of GI changes during the composting process of kitchen waste.

[0025] Figure 8 This is a graph showing the NH3 emission trend under different high-temperature pretreatment conditions.

[0026] Figure 9 This is a graph showing the trend of cumulative H2S emissions under different pretreatment conditions during the composting of kitchen waste residue.

[0027] The diagram is marked as follows: 1. Rack; 2. Mixing tank; 201. Inlet; 202. First electric gate valve; 203. Outlet; 204. Material gate; 205. Discharge baffle; 206. Thermometer; 207. Exhaust pipe; 3. Feed hopper; 301. Second electric gate valve; 4. Door opening assembly; 401. Hydraulic cylinder; 402. Hydraulic station; 403. Roller; 5. Stirring assembly; 501. First stirring shaft; 502. First stirring blade; 503. First geared motor; 504. Second stirring shaft; 505. Second stirring blade; 506. Second geared motor; 6. Electric heating plate; 7. Cooling pipe; 8. Feeding elevator. Detailed Implementation

[0028] In the description of this invention, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The following is in conjunction with the appendix Figures 1-6 The present invention will be further described below.

[0031] Example 1 In view of the technical problems existing in the background art, the present invention provides a device for promoting the precipitation of organic matter from kitchen waste residue.

[0032] In the specific technical solution, refer to Figure 1 , Figure 2 and Figure 3The device for promoting the precipitation of organic matter from kitchen waste includes a frame 1, on which a mixing tank 2 is mounted. The mixing tank 2 has a U-shaped structure. As a mixing container for materials, the mixing tank 2 has a feed inlet 201 at its top for easy material entry. A first electric gate valve 202 is installed on the feed inlet 201 to open and close it. For easy material dumping, a discharge outlet 203, a material gate 204 for opening and closing the discharge outlet 203, and an opening assembly 4 for driving the opening and closing of the material gate 204 are installed at the bottom of the mixing tank 2. The opening assembly 4 can automatically open and close the material gate 204 to dump the material. For temporary material storage, a hopper 3 for temporary material storage is installed on the frame below the discharge outlet 203. A second electric gate valve 301 for unloading is installed at the bottom of the hopper 3. A mixing assembly 5 for mixing materials is installed inside the mixing tank 2. The first electric gate valve 202 and the second electric gate valve 301 are existing mature devices, which are referenced in this invention. Their principles and structures will not be described in detail here.

[0033] In particular, this embodiment also includes a heating component and a cooling component installed on the inner wall of the mixing tank 2. The heating component is used to heat the material in the mixing tank 2 at a short-term high temperature, while the cooling component is used to rapidly cool the material in the mixing tank 2. After the heating component has finished heating the material, it is turned off and the cooling component is immediately started.

[0034] The heating assembly includes several electric heating plates 6 spaced at certain intervals on the inner wall of the mixing tank 2. The heating time of the heating assembly is 3h to 5h, and the heating temperature of the heating assembly is 120℃ to 140℃. The purpose is to heat the material to 75℃ to 85℃.

[0035] The cooling assembly includes several cooling pipes 7 installed on the inner wall of the mixing tank 2. The cooling pipes 7 are arranged between adjacent electric heating plates 6, and the cooling pipes 7 and electric heating plates 6 are arranged alternately. The cooling time of the cooling assembly is 0.5h to 1h. The cooling medium in the cooling pipes 7 can be room temperature water, with the aim of reducing the temperature of the material to 40℃ to 50℃.

[0036] The object of this invention is fine kitchen waste residue, which is obtained by crushing, screening, and extracting oil from kitchen waste. This residue is then used to make finished compost. The process of making compost from kitchen waste residue requires the addition of auxiliary materials, such as distiller's grains and rice husks.

[0037] Working principle: Open the first electric gate valve 202 and ensure that the material gate 204 is closed. Add the kitchen waste residue into the mixing tank 2 through the feed inlet 201, then close the first electric gate valve 202. Start the mixing component 5 in the mixing tank 2 to mix the material, and simultaneously start the heating component. In the initial stage of mixing, add a certain proportion of auxiliary materials to the mixing tank 2 according to the amount of kitchen waste residue. After the heating component runs for 2 to 4 hours, when the temperature of the material reaches 75℃ to 85℃, turn off the heating component and immediately start the cooling component. The cooling component cools the material. After the cooling component runs for 0.5 to 1 hour, when the temperature of the material cools to 40℃ to 50℃, it can be discharged. When discharging, open the discharge port 203 through the door opening component 4, and the material in the mixing tank 2 falls into the discharge hopper 3 below for temporary storage. Finally, the material is transported to the designated location for inoculation and fermentation by a trolley.

[0038] As can be seen from the above structure and working principle, the device of this invention adopts a short-term high-temperature pretreatment and rapid cooling method. Firstly, the short-term high-temperature pretreatment can sterilize, inactivate, and eliminate pathogens. High temperature helps accelerate the degradation rate of organic matter, promotes organic matter degradation, speeds up the composting process, and reduces odor emissions. Secondly, it can reduce the loss of nutrients such as nitrogen. Microorganisms convert nitrogen into nitrogen gas during nitrification and denitrification. Short-term high-temperature pretreatment can inhibit the conversion of nitrogen into nitrogen gas by microorganisms, thereby reducing the loss of nutrients such as nitrogen and allowing more nitrogen to remain in the kitchen waste residue, increasing the nutritional value of the final compost product. Thirdly, short-term high-temperature pretreatment can break down the polymer bonds of organic matter, promoting the precipitation of humic substances and retaining more nutrients. The purpose of cooling is to cool the kitchen waste residue to a temperature suitable for the microorganisms. Furthermore, the combination of rapid cooling and short-term high-temperature pretreatment, through the alternating effects of hot and cold, strengthens the breaking down of polymer bonds in organic matter and promotes the precipitation of humic substances, resulting in the retention of more nutrients.

[0039] Compost is an effective soil conditioner. The product is neutral to slightly alkaline, containing abundant humus, organic matter, and microorganisms. It can increase soil pH, alleviating soil acidification; improve soil physicochemical properties, structure, and water-holding capacity; increase the content of various nutrients in the soil, including N, P, K, and many essential micronutrients, thus improving soil fertility; and increase the number of soil microorganisms and promote enzyme activity. Furthermore, the soil-improving effects of compost application can generally last for many years, and the improved soil properties remain effective over time.

[0040] The existing organic waste disposal model mainly incurs costs for multiple material transportation (approximately 50 RMB / ton) and subsequent power plant leachate treatment (approximately 80 RMB / ton). Including pretreatment and other costs, the disposal cost per ton of organic waste is approximately 150 RMB / ton. Currently, the company disposes of approximately 100 tons of organic waste per day, with annual disposal costs of approximately 5.4 million RMB. After researching organic waste resource utilization technologies and equipment, organic solid residue and biogas residue can be composted into fertilizer, which can then be sold. Assuming a 35% conversion rate for kitchen waste composting, with a daily organic waste volume of approximately 100 tons, the daily compost production is 35 tons. The aerobic composting cost for solid residue and biogas residue is 120 RMB / ton, and the fertilizer selling price is 350 RMB / ton. Therefore, the annual operating cost is 4.38 million RMB, the fertilizer sales revenue is 4.47 million RMB, and the annual profit is 100,000 RMB. Compared to the original disposal model, this not only saves a significant portion of the disposal costs but also generates nearly 100,000 RMB in profit.

[0041] Among them, reference Figure 1 In this embodiment, the stirring assembly 5 includes a first stirring shaft 501 arranged horizontally along the axial direction of the stirring tank 2, a first stirring blade 502 is provided on the first stirring shaft 501, and a first reduction motor 503 for driving the first stirring shaft 501 to rotate is connected to one end of the first stirring shaft 501.

[0042] Working principle: Start the first reduction motor 503, which drives the first stirring shaft 501 to rotate. The first stirring blade 502 set on the first stirring shaft 501 rotates synchronously with the first stirring shaft 501 to stir and mix the materials in the mixing tank 2.

[0043] Among them, reference Figure 2 In this embodiment, the door opening assembly 4 includes a hydraulic cylinder 401 horizontally arranged on the frame below the material gate 204. The hydraulic cylinder 401 is connected to the hydraulic station 402. A roller 403 is provided at the end of the piston rod of the hydraulic cylinder 401. The side of the material gate 204 near the hydraulic cylinder 401 is hinged to the mixing tank 2. The roller 403 is rotatably connected to the material gate 204. The material gate 204 can be opened and closed by extending and retracting the hydraulic cylinder 401. A discharge baffle 205 is vertically provided on the side of the discharge port 203 away from the hydraulic cylinder 401.

[0044] Working principle: During the feeding stage, the hydraulic cylinder 401 extends, and the piston rod of the hydraulic cylinder drives the roller 403 at its end to extend synchronously. The bottom of the material gate 204 is arc-shaped, and the roller 403 is in rolling connection with the material gate 204. As the hydraulic cylinder 401 gradually extends, the roller 403 drives the material gate 204 to rotate upward until the material gate 204 is completely closed. The roller 403 provides support for the material gate 204. During the unloading stage, the above steps are reversed, that is, the hydraulic cylinder 401 retracts until the material gate 204 opens.

[0045] Specifically, refer to Figure 2 In this embodiment, a feeding elevator 8 is also installed on the frame next to the mixing tank 2. A thermometer 206 is installed inside the mixing tank 2 for real-time monitoring of the material temperature inside the mixing tank; an exhaust pipe 207 is installed on the top of the mixing tank 2, and the exhaust pipe 207 is connected to an odor treatment device. The feeding elevator is a mature piece of existing technology, which is referenced in this invention, and its principle and structure will not be described in detail here.

[0046] Example 2 The difference between this embodiment and Embodiment 1 lies in the arrangement of the stirring component 5. (Refer to...) Figure 2 and Figure 3 The stirring assembly 5 in this embodiment also includes a second stirring shaft 504 arranged side by side with the first stirring shaft 501. The second stirring shaft 504 is provided with a second stirring blade 505, and one end of the second stirring blade 505 is connected to a second reduction motor 506 for driving the second stirring shaft 504 to rotate.

[0047] By setting up two stirring shafts, different stirring methods can be adopted to cope with different material throughput, material types, and material stirring methods at different stages.

[0048] Reference Figure 4 The two stirring shafts rotate in the same direction, either clockwise or counterclockwise. This stirring method is suitable for the material feeding stage, where the two shafts can rotate in the same direction to initially mix the material and distribute it evenly within the mixing tank.

[0049] Reference Figure 5 The two stirring shafts rotate in opposite directions, with both shafts facing outwards. Because the heating and cooling components of this device are located on the inner wall of the mixing tank 2, the two shafts rotate upwards in opposite directions during the heating and cooling stages, causing the material inside the mixing tank 2 to tumble and compress towards the outer wall, enabling it to fully exchange heat with the outer wall and improving heating and cooling efficiency.

[0050] Reference Figure 6 The two stirring shafts rotate in opposite directions, with both shafts facing inwards. During the auxiliary material addition and discharge stages, the two shafts can rotate downwards in opposite directions. When adding auxiliary materials, the material is introduced from the top of the mixing tank 2, and the downward rotation of the two shafts allows the auxiliary materials to quickly sink and mix with the main material. During the discharge stage, due to the viscosity of the material, opening the material gate 204 at the bottom of the mixing tank 2 may not allow all the material to be poured out. At this time, the downward rotation of the two shafts causes the material to be squeezed against each other and fall from the middle of the two stirring shafts, making the discharge smoother.

[0051] Example 3 To investigate the effects of pretreatment temperature and time on kitchen waste residue, the effects of pretreatment temperature and time on composting maturity and odor emission were investigated at pretreatment temperatures of 65℃, 70℃, 75℃, 80℃, 85℃, 90℃ and 95℃, and pretreatment times of 2h, 4h and 6h. The pretreatment temperature was the temperature of the material.

[0052] Seed germination index (GI) is chosen as an important indicator for evaluating the maturity of compost and the phytotoxicity of compost products. The organic fertilizer standard NY525-2021 stipulates that a GI > 70% indicates maturity, while some researchers have suggested that a GI > 80% is required for compost products to be free of phytotoxicity (Wang et al., 2022b). Figure 7 As shown, Figure 7 The graph shows the trend of GI (Glycemic Index) during the composting of kitchen waste residue. Under different pretreatment temperatures and times, the GI exhibits a trend of first fluctuating upwards and then decreasing. The GI reaches its maximum value (131.74%) when the pretreatment temperature and time are 80℃ and 4h. Furthermore, from... Figure 7 The study also revealed that when the pretreatment temperature was between 75℃ and 85℃, the GI (Gross Intake) of most treatment groups was >100%, except for a few. However, when the temperature exceeded 85℃, the GI showed a sharp trend. Therefore, kitchen waste composting can achieve a better composting maturity at temperatures between 75℃ and 85℃. Furthermore, even at the same treatment temperature, the GI exhibited dynamic changes, which was caused by differences in pretreatment time. The length of pretreatment time can be considered, to some extent, a selection process based on the temperature tolerance of certain microorganisms in the compost. Shorter pretreatment times meant insufficient screening of microorganisms in the compost. Longer pretreatment times resulted in decreased activity or even inactivation of certain key functional microorganisms due to prolonged exposure to high temperatures. Therefore, the figure shows that at a treatment temperature of 75℃ to 85℃, the GI was relatively high when the treatment time was 4 hours.

[0053] NH3 emissions are not only the main factor causing nitrogen loss during kitchen waste composting, but also the main odor gas during composting (Liu et al., 2020). Figure 8 The graph shows the NH3 emission trend under different high-temperature pretreatment conditions. Figure 8It can be observed that NH3 emissions exhibit a dynamic trend of first decreasing and then increasing with increasing pretreatment temperature. Specifically, when the pretreatment temperature is between 75℃ and 85℃, the cumulative NH3 emissions remain within a relatively low range of 1465.01–1826.03 mg·kg⁻¹, with the lowest cumulative NH3 emissions (1465.01 mg·kg⁻¹) observed at a pretreatment temperature of 80℃ and a pretreatment time of 4 hours. Between 65℃ and 80℃, NH3 emissions show a favorable decreasing trend. This is because high-temperature pretreatment, to some extent, selects for thermophilic nitrifying bacteria, enhancing NH4⁺ production. + -N to NO3 - The activity of -N conversion is relatively low (Wang et al., 2022a), but when the temperature exceeds 85°C, the cumulative emission of NH3 begins to increase significantly. This is because as the temperature rises, some key microorganisms in the heap are inactivated or their activity is reduced, thus decreasing their ability to convert NH4+. + The utilization of [the substance] leads to an increase in NH3 emissions.

[0054] Although the emissions of sulfur-containing odorous gases are less than those of NH3, their odor threshold is much lower (Gao et al., 2022). Among them, H2S is a composting byproduct with malodorous, corrosive and highly toxic properties (Liu et al., 2020). Figure 9 This shows the changing trend of cumulative H2S emissions under different pretreatment conditions during the composting of kitchen waste residue. Similar to the cumulative emission trend of NH3, both show a trend of first decreasing and then increasing with increasing pretreatment temperature. Figure 9 The data shows that when the temperature is between 65℃ and 70℃ and between 90℃ and 95℃, the cumulative H2S emissions of each treatment group remain at a relatively high level. When the temperature is between 75℃ and 85℃, the graph shows that as the temperature increases, the cumulative H2S emissions reach their lowest point (1.30 mg·kg⁻¹) when the pretreatment temperature is 85℃ and the treatment time is 4 hours. Subsequently, the cumulative H2S emissions gradually increase with the increase of pretreatment time and temperature. Overall, in the composting of kitchen waste residue, a pretreatment temperature of 75℃ to 85℃ and a treatment time of 4 hours can basically achieve a good H2S emission reduction effect.

[0055] In summary, the optimal parameters are achieved when the pretreatment temperature is between 75℃ and 85℃ and the treatment time is 4 hours.

[0056] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for promoting the precipitation of organic matter from kitchen waste residue, characterized in that, The equipment includes a frame (1), on which a mixing tank (2) is mounted. The mixing tank (2) has a U-shaped structure. The top of the mixing tank (2) is provided with a feed inlet (201). The feed inlet (201) is provided with a first electric gate valve (202) that can open and close the feed inlet (201). The bottom of the mixing tank (2) is provided with a discharge port (203), a material gate (204) that can open and close the discharge port (203), and a door opening assembly (4) that drives the material gate (204) to open and close. A hopper (3) for temporarily storing materials is mounted on the frame below the discharge port (203). A second electric gate valve (301) for unloading materials is mounted on the lower part of the hopper (3). A mixing assembly (5) for mixing materials is mounted inside the mixing tank (2). The inner wall of the mixing tank (2) is provided with a heating component, which is used to heat the material in the mixing tank (2) at a short time.

2. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 1, characterized in that, The heating assembly includes several electric heating plates (6) spaced at a certain distance on the inner wall of the mixing tank (2). The heating time of the heating assembly is 3h to 5h, and the heating temperature of the heating assembly is 120℃ to 140℃.

3. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 2, characterized in that, The inner wall of the mixing tank (2) is provided with a cooling assembly, which is used to rapidly cool the material in the mixing tank (2). After the heating component has finished heating the material, turn off the heating component and immediately start the cooling component.

4. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 3, characterized in that, The cooling assembly includes several cooling pipes (7) disposed on the inner wall of the mixing tank (2), the cooling pipes (7) being arranged between adjacent electric heating plates (6), and the cooling pipes (7) and electric heating plates (6) being arranged alternately.

5. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 1, characterized in that, The stirring assembly (5) includes a first stirring shaft (501) arranged horizontally along the axial direction of the stirring tank (2), a first stirring blade (502) is provided on the first stirring shaft (501), and a first reduction motor (503) for driving the first stirring shaft (501) to rotate is connected to one end of the first stirring shaft (501).

6. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 5, characterized in that, The stirring assembly (5) further includes a second stirring shaft (504) arranged side by side with the first stirring shaft (501), a second stirring blade (505) is provided on the second stirring shaft (504), and a second geared motor (506) for driving the second stirring shaft (504) to rotate is connected to one end of the second stirring blade (505).

7. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 1, characterized in that, The opening assembly (4) includes a hydraulic cylinder (401) arranged horizontally on the frame below the material gate (204). The hydraulic cylinder (401) is connected to the hydraulic station (402). A roller (403) is provided at the end of the piston rod of the hydraulic cylinder (401). The side of the material gate (204) near the hydraulic cylinder (401) is hinged to the mixing tank (2). The roller (403) is tumbled to the material gate (204). The material gate (204) can be opened and closed by extending and retracting the hydraulic cylinder (401).

8. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 7, characterized in that, A discharge baffle (205) is vertically arranged on the side of the discharge port (203) away from the hydraulic cylinder (401).

9. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 1, characterized in that, A feeding elevator (8) is installed on the frame next to the mixing tank (2).

10. The device for promoting the precipitation of organic matter from kitchen waste as described in claim 1, characterized in that, The mixing tank (2) is equipped with a thermometer (206) for real-time detection of the temperature of the material inside the mixing tank; an exhaust pipe (207) is provided on the top of the mixing tank (2), and the exhaust pipe (207) is connected to the odor treatment equipment.

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