Kitchen waste high-temperature aerobic fermentation system with waste heat recovery function

Abstract

The utility model relates to a kitchen waste high-temperature aerobic fermentation system with a waste heat recovery function. The equipment comprises a high-temperature aerobic fermentation bin, a heating and stirring device, a temperature and humidity monitoring assembly, a fan and a control system, the high-temperature aerobic fermentation bin is used for aerobic fermentation of kitchen waste, the heating and stirring device can utilize waste heat of the fermentation bin to heat kitchen waste water, and a heating pipe is arranged in the heating and stirring device; the heating pipe is integrally immersed in kitchen waste water of the heating and stirring device, a nozzle is formed in the heating pipe, the fan is used for injecting humid and hot air in the high-temperature aerobic fermentation bin into the heating pipe, and the temperature and humidity monitoring assembly is used for monitoring the temperature and humidity in the high-temperature aerobic fermentation bin. The control system is used for controlling start and stop of the fan according to monitoring information of the temperature and humidity monitoring assembly. The draught fan is controlled to inject humid and hot air in the fermentation bin into the heating pipe, the heating pipe heats kitchen waste water through heat exchange, the kitchen waste water is directly sprayed and heated through the nozzle, and waste heat recovery is achieved.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature aerobic fermentation treatment technology for kitchen waste, specifically to a high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function. Background Technology

[0002] High-temperature aerobic fermentation technology for food waste is an advanced treatment process for food waste. It utilizes the metabolic activities of aerobic microorganisms in an aerobic environment to biodegrade pre-treated food waste.

[0003] The core objective of this technology is to achieve the harmlessness, reduction, and resource recovery of food waste. Through the metabolic action of microorganisms, food waste is decomposed, producing carbon dioxide, water, and a small amount of heat energy. To shorten the fermentation time of food waste, a high-temperature aerobic fermentation chamber has been developed.

[0004] The high-temperature aerobic fermentation chamber is a highly integrated device that can precisely control key parameters in the fermentation process of food waste, including temperature, humidity, and oxygen supply. Through this precise control, the high-temperature aerobic fermentation chamber can quickly convert food waste into high-quality organic matter, significantly improving fermentation efficiency and ensuring the quality and stability of the fermentation products.

[0005] However, the moisture content of pre-treated kitchen waste is typically as high as 75% to 80%. Therefore, after the kitchen waste enters the high-temperature fermentation chamber, it first needs to be preheated to adjust the moisture content. Adjusting the moisture content significantly increases the energy consumption of the high-temperature aerobic fermentation chamber, becoming a pain point in the operation process. To ensure the effectiveness of high-temperature aerobic fermentation, it is necessary to remove the water vapor in the fermentation chamber in a timely manner. The conventional practice is to connect the high-temperature aerobic fermentation chamber to the plant's deodorization system.

[0006] This simplistic approach has two drawbacks. First, it significantly increases the processing capacity of the deodorization system, adding to its operational burden. Second, the intermittent release of high-temperature, high-humidity gases during fermentation exerts a strong impact on the system. This impact is particularly pronounced in systems employing biological deodorization techniques, potentially affecting microbial activity and reducing system efficiency. Furthermore, the water vapor emitted from the fermentation chamber reaches temperatures as high as 55-60°C; directly introducing this vapor into the deodorization system results in substantial heat loss. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function. The system controls the fan to introduce the hot and humid air in the fermentation chamber into the heating and stirring device. First, the kitchen wastewater is heated by heat exchange through the heating tube. Then, the gas in the heating tube is directly injected into the kitchen wastewater through the nozzle on the heating tube to achieve waste heat recovery.

[0008] To address the aforementioned technical problems, this utility model provides a high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function. The system includes a high-temperature aerobic fermentation chamber, a heating and stirring device, a temperature and humidity monitoring component, a fan, and a control system. The high-temperature aerobic fermentation chamber is used for aerobic fermentation of kitchen waste. The heating and stirring device is used to heat kitchen wastewater. A heating pipe is installed inside the heating and stirring device, and the entire heating pipe is submerged in the kitchen wastewater. A nozzle is installed on the heating pipe. The fan injects hot and humid air from the high-temperature aerobic fermentation chamber into the heating pipe. The temperature and humidity monitoring component monitors the temperature and humidity inside the high-temperature aerobic fermentation chamber. The control system controls the start and stop of the fan based on the monitoring information from the temperature and humidity monitoring component.

[0009] Furthermore, a connecting pipe is provided between the high-temperature aerobic fermentation chamber and the heating and stirring device, and the fan is installed on the connecting pipe. The two ends of the connecting pipe are respectively connected to the high-temperature aerobic fermentation chamber and the heating pipe.

[0010] Furthermore, a check valve is installed on the connecting pipe.

[0011] Furthermore, the heating tube is a spiral coil with its axial direction vertical, and the lower end opening of the spiral coil forms the nozzle.

[0012] Furthermore, the heating and stirring device is equipped with a stirrer inside, and the spiral coil is wound around the outer periphery of the stirrer, with the axis of the spiral coil coinciding with the axis of the stirrer.

[0013] Furthermore, the upper air inlet of the heating tube is located at the upper part of the inner cavity of the heating and stirring device.

[0014] Furthermore, the heating and stirring device is a heating and stirring tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) When the temperature and humidity in the high-temperature aerobic fermentation chamber reach the required discharge level, the control system starts the fan. The fan injects the hot and humid air in the high-temperature aerobic fermentation chamber into the heating pipe. The hot and humid air first exchanges heat with the kitchen wastewater through the heating pipe, and then is sprayed into the kitchen wastewater from the nozzle of the heating pipe. The hot and humid air heats the kitchen wastewater through a combination of direct injection as the main method and heat exchange as the auxiliary method, so as to achieve the effect of waste heat recovery of the hot and humid air in the high-temperature aerobic fermentation chamber.

[0017] The control system controls the start and stop of the fan through temperature and humidity monitoring components, which can realize automatic control, ensure that the temperature and humidity in the high-temperature aerobic fermentation chamber are suitable, and can make timely use of waste heat to ensure the efficient operation and stability of the system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function in Embodiment 1 of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of a high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function in Embodiment 2 of this utility model.

[0020] In the diagram: 1. High-temperature aerobic fermentation chamber; 2. Thermometer; 3. Hygrometer; 4. Fan; 5. Check valve; 6. Heating and stirring device; 7. Mixer; 8. Heating pipe; 9. Nozzle; 10. Connecting pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings: Specific Implementation Example 1:

[0023] refer to Figure 1 This utility model discloses a high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function (hereinafter referred to as the fermentation system), comprising a high-temperature aerobic fermentation chamber 1, a heating and stirring device 6, a temperature and humidity monitoring component, a fan 4, and a control system. A heating pipe 8 is installed inside the heating and stirring device 6, and the entire heating pipe 8 is submerged in the kitchen wastewater within the heating and stirring device 6. A nozzle 9 is installed on the heating pipe 8. The fan 4 is used to inject hot and humid air from the high-temperature aerobic fermentation chamber 1 into the heating pipe 8. The temperature and humidity monitoring component is used to monitor the temperature and humidity inside the high-temperature aerobic fermentation chamber 1. The control system is used to control the start and stop of the fan 4 based on the monitoring information from the temperature and humidity monitoring component.

[0024] Specifically, the high-temperature aerobic fermentation chamber 1 and the heating and stirring device 6 are two parallel processing units in the food waste treatment process. The high-temperature aerobic fermentation chamber 1 receives pre-treated food waste and, under human intervention, rapidly completes the high-temperature aerobic fermentation process. Throughout the fermentation process, relevant parameters such as humidity and temperature within the high-temperature aerobic fermentation chamber 1 are monitored online. The high-temperature aerobic fermentation chamber 1 is equipped with instruments for monitoring temperature, humidity, and other relevant parameters; therefore, in this embodiment, the temperature and humidity monitoring components directly utilize the thermometer 2 and hygrometer 3 located within the high-temperature aerobic fermentation chamber 1.

[0025] The heating and stirring device 6 is used to heat and stir the kitchen wastewater in the kitchen waste, reduce the viscosity of the wastewater, and improve the oil-water separation conditions.

[0026] The specific high-temperature aerobic fermentation chamber 1 and heating and stirring device 6 are conventional equipment in the prior art, and will not be described in detail here. The fermentation system of this utility model uses a fan 4, a control system and a heating pipe 8, etc., to combine the two to inject the hot and humid gas in the high-temperature aerobic fermentation chamber 1 into the heating and stirring device 6 to heat the kitchen wastewater and achieve the effect of waste heat recovery.

[0027] Specifically, when the temperature and humidity inside the high-temperature aerobic fermentation chamber 1 reach the required discharge level, the control system starts the fan 4. The fan 4 injects the hot and humid air inside the high-temperature aerobic fermentation chamber 1 into the heating pipe 8. The hot and humid air first exchanges heat with the kitchen wastewater through the heating pipe 8, and then is sprayed into the kitchen wastewater from the nozzle 9 of the heating pipe 8. The hot and humid air heats the kitchen wastewater through a combination of direct injection as the main method and heat exchange as the auxiliary method, thereby achieving the effect of waste heat recovery from the hot and humid air inside the high-temperature aerobic fermentation chamber 1.

[0028] The control system controls the start and stop of fan 4 through temperature and humidity monitoring components, which can realize automatic control, ensure that the temperature and humidity in the high-temperature aerobic fermentation chamber 1 are suitable, and can make timely use of waste heat to ensure the efficient operation and stability of the system.

[0029] Preferably, in this embodiment, a connecting pipe 10 is provided between the high-temperature aerobic fermentation chamber 1 and the heating and stirring device 6. A blower 4 is installed on the connecting pipe 10, and both ends of the connecting pipe 10 are connected to the high-temperature aerobic fermentation chamber 1 and the heating pipe 8, respectively. A check valve 5 is installed on the connecting pipe 10, specifically between the blower 4 and the heating pipe 8. The check valve 5 prevents air in the heating pipe 8 or kitchen wastewater in the heating and stirring device 6 from flowing back into the high-temperature aerobic fermentation chamber 1 when the blower 4 stops operating or when the system pressure fluctuates, thus avoiding interference with the fermentation environment within the fermentation chamber and ensuring the normal progress of the fermentation process.

[0030] Preferably, in this embodiment, the heating and stirring device 6 includes a tank and a stirrer 7 mounted on the tank. The stirring shaft of the stirrer 7 extends downward into the tank, and stirring blades are installed on the stirring shaft. The stirrer 7 is used to stir the kitchen wastewater. The heating tube 8 is a vertically oriented spiral coil, that is, the heating tube 8 is arranged spirally from top to bottom. The spiral coil is wound around the outer circumference of the stirring shaft of the stirrer 7, and the axis of the spiral coil coincides with the axis of the stirrer 7. The horizontal length of the stirring blades is less than the inner radius of the spiral coil to avoid interference. The lower opening of the spiral coil forms the aforementioned nozzle 9.

[0031] The heating element 8 is designed as a spiral coil arranged from top to bottom, which increases the contact area between the heating element 8 and the kitchen wastewater. This allows for more thorough heat exchange between the warm air and the wastewater, improving the efficiency of waste heat recovery and heating the kitchen wastewater more effectively. The spiral coil structure ensures more uniform airflow within the coil, extending the air's residence time and further enhancing the heat exchange effect, resulting in more even heating of the kitchen wastewater. An opening at the lower end of the spiral coil forms a nozzle 9, which can spray humidified hot air into the lower part of the kitchen wastewater, improving the uniformity of heating.

[0032] In this embodiment, the lower opening of the heating tube 8 is a flat opening, which constitutes the nozzle 9. Specifically, in actual production, the flat opening is formed by pressing the lower end of the heating tube 8.

[0033] In other embodiments, when meeting actual usage requirements, a pre-made nozzle 9 can be purchased and a dedicated pre-made nozzle 9 can be separately installed at the lower end of the heating pipe 8. Alternatively, in other embodiments, when meeting actual usage requirements, the nozzle 9 can be set on the pipe body of the heating pipe 8, and the nozzle 9 can be formed by setting perforations on the pipe body to achieve the purpose of direct spraying.

[0034] In other embodiments, to meet practical usage requirements, the heating tube 8 can be a vertical straight tube. To ensure heating effect, multiple vertical straight tubes can be arranged in a circumferential array around the mixer 7. The upper end of each vertical straight tube is connected to a ring pipe, and the connecting pipe 10 is connected to the ring pipe. The lower end of each vertical straight tube is open, forming a nozzle 9. In other embodiments, to meet practical usage requirements, multiple downward-facing nozzles 9 can be spaced apart on the spiral coil.

[0035] Preferably, in this embodiment, such as Figure 1 As shown, the upper opening of the heating tube 8 is the air inlet, located at the upper part of the inner cavity of the heating and stirring device 6. The lower nozzle 9 of the heating tube 8 is located near the lower part of the inner cavity of the heating and stirring tank. This ensures that the heating tube 8 is in full contact with the kitchen wastewater, increasing the airflow path within the heating tube 8 and improving waste heat recovery efficiency. The heating tube 8 is arranged in a spiral from top to bottom. Firstly, the height of the entire spiral section immersed in water can be adjusted according to actual needs. Secondly, the top-to-bottom arrangement of the heating tube 8 ensures that no wastewater remains inside the heating tube 8 after the cooling wastewater is drained.

[0036] Preferably, in this embodiment, the fermentation system of this utility model is suitable for projects that use heated mixing tanks to heat kitchen wastewater, and the heating and mixing device 6 is a heated mixing tank built on the ground.

[0037] In actual use, the distance between the nozzle 9 and the liquid surface of the kitchen wastewater directly affects the air pressure of the fan 4, and thus the power of the fan 4. Therefore, by adjusting the height of the nozzle 9 from the liquid surface, the effect of waste heat exchange can be met while achieving economical adjustment.

[0038] The working process of this application is as follows: During the fermentation process in the high-temperature aerobic fermentation chamber 1, thermometer 2 and hygrometer 3 monitor the changes in parameters inside the chamber in real time. When the temperature and humidity inside the chamber are detected to affect the fermentation efficiency, the control system turns on the fan 4. The fan 4 injects the hot and humid air in the high-temperature aerobic fermentation chamber 1 into the heating pipe 8 through the connecting pipe 10. The hot and humid air exchanges heat with the kitchen wastewater in the heating and stirring tank through the heating pipe 8 and is directly sprayed into the kitchen wastewater through the nozzle 9. The kitchen wastewater is heated by a heating scheme that uses direct injection heating as the main method and spiral coil pipe heat exchange as a supplement, thereby achieving the effect of recovering and utilizing the waste heat in the high-temperature aerobic fermentation chamber 1.

[0039] When the temperature and humidity in the high-temperature aerobic fermentation chamber 1 drop to the critical level, the fan 4 stops working, and this process is repeated to achieve waste heat recovery in the high-temperature aerobic fermentation chamber 1.

[0040] In practical use, from an operational perspective, calculations show that with an effective volume of 5m²... 3 Taking the heated mixing tank as an example, the fermentation system of this invention can utilize the waste heat from a 5t / d high-temperature aerobic fermentation chamber 1 to raise the temperature of the kitchen waste wastewater in the mixing tank from 15℃ to about 40℃. This reduces steam consumption by approximately 132.41kg, saves water by approximately 189.16kg, and saves electricity by approximately 47.5kW·h. Based on this, the amount of steam used for heating can be reduced by approximately 25.46%, the water saving efficiency is approximately 25.46%, and the energy consumption is reduced by approximately 12.68%.

[0041] Example 2: This example provides a different heating and stirring device, which differs from Example 1 in that, as shown in Example 1... Figure 2 As shown in this embodiment, the fermentation system of this utility model is suitable for projects that use a heated stirring tank to heat kitchen wastewater, and the heating and stirring device is a heated stirring tank that extends deep underground.

[0042] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0043] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they 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 on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function, characterized in that, The system includes a high-temperature aerobic fermentation chamber, a heating and stirring device, a temperature and humidity monitoring component, a fan, and a control system. The high-temperature aerobic fermentation chamber is used for aerobic fermentation of kitchen waste. The heating and stirring device is used to heat kitchen wastewater. The heating and stirring device is equipped with a heating pipe, which is completely submerged in the kitchen wastewater and has nozzles. The fan is used to inject hot and humid air from the high-temperature aerobic fermentation chamber into the heating pipe. The temperature and humidity monitoring component is used to monitor the temperature and humidity inside the high-temperature aerobic fermentation chamber. The control system is used to control the start and stop of the fan based on the monitoring information from the temperature and humidity monitoring component.

2. The high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function according to claim 1, characterized in that, A connecting pipe is provided between the high-temperature aerobic fermentation chamber and the heating and stirring device. The fan is installed on the connecting pipe, and the two ends of the connecting pipe are respectively connected to the high-temperature aerobic fermentation chamber and the heating pipe.

3. The high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function according to claim 2, characterized in that, A check valve is installed on the connecting pipe.

4. The high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function according to claim 1, characterized in that, The heating tube is a vertically oriented spiral coil, and the lower end opening of the spiral coil forms the nozzle.

5. The high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function according to claim 4, characterized in that, The heating and stirring device is equipped with a stirrer inside, and the spiral coil is wound around the outer circumference of the stirrer, with the axis of the spiral coil coinciding with the axis of the stirrer.

6. The high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function according to claim 4, characterized in that, The upper air inlet of the heating tube is located at the upper part of the inner cavity of the heating and stirring device.

7. The high-temperature aerobic fermentation system for kitchen waste with waste heat recovery function according to claim 1, characterized in that, The heating and stirring device is a heating and stirring tank.

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