Excrement fermentation device and excrement treatment system

Abstract

The utility model relates to the technical field of fermentation, and provides an excrement fermentation device and an excrement treatment system. The manure fermentation device comprises a fermentation tank, a plurality of first stirrers and a second stirrer, the plurality of first stirrers are arranged on the side wall of the lower part of the fermentation tank at intervals along the circumferential direction of the fermentation tank, each first stirrer extends into the fermentation tank, and the mounting heights of the plurality of first stirrers are the same; the second stirrer is arranged on the side wall of the top of the fermentation tank and extends into the fermentation tank; the second stirrer is located between two adjacent first stirrers, and the projection included angle formed by the second stirrer and the first stirrers is 70-110 degrees. According to the utility model, the excrement just entering the fermentation tank can be quickly mixed with the original excrement, so that the excrement is prevented from being deposited; a scum layer can be prevented from appearing on the top of fibers in the feces, and gas release in the fermentation tank is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of fermentation technology, and in particular to a manure fermentation device and a manure treatment system. Background Technology

[0002] In the livestock industry, manure treatment is a crucial aspect of environmental management and resource recycling, especially for large and medium-sized dairy farms both domestically and internationally. The efficiency and effectiveness of manure treatment directly impact the farm's sustainable development and the ecological balance of the surrounding environment. Currently, these farms commonly employ anaerobic fermentation as the primary method for manure treatment. This process utilizes microorganisms to decompose manure under anaerobic conditions, converting it into biogas (primarily methane) and stable organic residues. This achieves both waste reduction and harmlessness, while also promoting resource recycling.

[0003] The core equipment in anaerobic fermentation is the anaerobic digester, and among the many types of digesters, the fully mixed anaerobic digester is widely used due to its simple structure and flexible operation. Continuous stirring in the fully mixed anaerobic digester ensures uniform distribution of the fermentation material within the tank, which is crucial for improving fermentation efficiency and maintaining a stable fermentation environment. The quality of stirring directly affects the contact efficiency between microorganisms and the substrate, the rate of fermentation product formation, and the overall performance of the system.

[0004] However, when domestic farms use fully mixed anaerobic fermenters for anaerobic fermentation, the fermentation liquid is unevenly distributed in the tank. Sediments easily form at the bottom, affecting microbial activity, while a scum layer often appears at the top, hindering the effective release of gas. Utility Model Content

[0005] This invention provides a manure fermentation device and a manure treatment system to solve the problems of uneven distribution and poor stability of fermentation liquid in the tank in existing manure fermentation devices.

[0006] This utility model provides a manure fermentation device, comprising: a fermentation tank; a plurality of first agitators, which are spaced apart along the circumference of the fermentation tank on the lower side wall of the fermentation tank, each of the first agitators extending into the fermentation tank, and the plurality of first agitators being installed at the same height; a second agitator, which is disposed on the top side wall of the fermentation tank and extends into the fermentation tank; the second agitator is located between two adjacent first agitators, and the projection angle formed by the second agitator and the first agitator is 70-110°.

[0007] According to the present invention, a manure fermentation device is provided, wherein the second agitator includes a stirring shaft, and the angle between the stirring shaft and the liquid surface in the fermentation tank is 0-20°.

[0008] According to the present invention, a manure fermentation device is provided, wherein the first agitator and the second agitator each further include a plurality of blades and a stirring shaft, wherein the plurality of blades are spirally connected to the stirring shaft; the spiral angle of the blades relative to the stirring shaft is 30-60°; each blade is welded to the stirring shaft, and the ratio of the weld length to the maximum width of the corresponding blade is 0.35-0.75.

[0009] According to the present invention, a manure fermentation device further includes a heating element and a controller. The heating element is disposed inside the fermentation tank and located at the lower part of the fermentation tank. The plurality of first stirrers, second stirrers, and the heating element are all electrically connected to the controller.

[0010] According to the present invention, a manure fermentation device further includes a first temperature sensor, a second temperature sensor, and a third temperature sensor disposed inside the fermentation tank. The first temperature sensor is disposed at the lower part of the fermentation tank, the second temperature sensor is disposed at the middle part of the fermentation tank, and the third temperature sensor is disposed at the top of the fermentation tank. The first temperature sensor, the second temperature sensor, and the third temperature sensor are electrically connected to the controller.

[0011] According to the present invention, a manure fermentation device further includes a liquid level sensor disposed inside the fermentation tank and electrically connected to the controller; and / or, it further includes a pressure sensor disposed at the top inside the fermentation tank and electrically connected to the controller.

[0012] According to the present invention, a manure fermentation device is provided, wherein the fermentation tank is further provided with an inlet and an outlet, the inlet being located at the lower part of the fermentation tank for communication with a manure collection device, and the outlet being for communication with a discharge pool; the top of the fermentation tank is provided with a gas outlet for communication with a biogas treatment device; and / or, the top of the fermentation tank is further provided with an observation port.

[0013] According to the present invention, a manure fermentation device is provided, wherein the side wall of the fermentation tank is provided with a first sampling port, a second sampling port and a third sampling port, the first sampling port is located at the lower part of the fermentation tank, the second sampling port is located at the middle part of the fermentation tank and the third sampling port is located at the top of the fermentation tank.

[0014] According to the present invention, a manure fermentation device further includes a heat insulation component, which covers the outer wall of the fermentation tank.

[0015] This utility model also provides a manure treatment system, including a manure fermentation device as described in any of the above claims, and further including a manure collection device and a discharge tank; the manure collection device includes a manure tank, the outlet of which is connected to the inlet of the fermentation tank; the outlet of the fermentation tank is connected to the inlet of the discharge tank.

[0016] The manure fermentation device and manure treatment system provided by this utility model, by setting multiple first agitators at the bottom of the fermentation tank, with the multiple first agitators at the same height, allows the manure entering the fermentation tank to be quickly mixed with the existing manure, preventing manure sedimentation; by setting a second agitator at the top of the fermentation tank, with the second agitator located between two adjacent first agitators and the projection angle formed by the second agitator and the first agitator being 70-110°, the flow of manure in the fermentation tank is increased, the temperature in the fermentation tank is uniform, and it is not possible for the fibers in the manure to form a scum layer at the top, which helps to release gas in the fermentation tank. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the sewage treatment system provided by this utility model;

[0019] Figure 2 This is a top view of the manure fermentation device provided by this utility model;

[0020] Figure 3 This is a schematic diagram of the blades in the first and second agitators provided by this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the first and second stirrers in this utility model;

[0022] Figure 5 This is a schematic diagram of blade #2 in a stirrer in the prior art;

[0023] Figure 6 This is a schematic diagram of blade #3 in a stirrer in the prior art;

[0024] Figure label:

[0025] 10. Manure fermentation device; 11. Fermentation tank; 111. Liquid inlet; 112. Liquid outlet; 113. Gas outlet; 114. First sampling port; 115. Second sampling port; 116. Third sampling port; 117. Observation port; 12. First stirrer; 13. Second stirrer; 14. Heating element; 15. First temperature sensor; 16. Second temperature sensor; 17. Third temperature sensor; 18. Liquid level sensor; 19. Pressure sensor;

[0026] 20. Sewage collection device; 21. Sewage tank; 22. Sewage pump; 23. First level gauge; 24. Fourth temperature sensor;

[0027] 30. Discharge tank; 31. Biogas slurry pump; 32. Second level gauge. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0030] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the embodiments of this utility model 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 the embodiments of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] The embodiments of this utility model are described in detail below. Examples of these 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0034] The following is combined Figures 1-4 This invention describes a manure fermentation device and a manure treatment system.

[0035] like Figure 1 and Figure 2As shown, the manure fermentation device 10 provided in this embodiment of the present invention includes: a fermentation tank 11, multiple first stirrers 12, and second stirrers 13. The fermentation tank 11 has a receiving cavity for the rapid degradation and transformation of organic waste, and effectively reduces the volume and weight of the manure, facilitating subsequent treatment and utilization. The fermentation tank 11 is provided with an inlet 111 and an outlet 112. The inlet 111 is located on the lower side wall of the fermentation tank 11 and is connected to the manure collection device 20 through an inlet pipe. The manure in the manure collection device 20 enters the fermentation tank 11 through the inlet 111 for fermentation. The outlet 112 is connected to the highest liquid level in the fermentation tank 11 through a pipeline and to the discharge tank 30 through a discharge pipe. When the liquid level in the fermentation tank 11 rises to the outlet 112, the liquid in the fermentation tank 11 enters the discharge tank 30 through the pipeline, the outlet 112, and the discharge pipe, enabling automatic discharge. The top of the fermentation tank 11 is also equipped with a gas outlet 113. The gas outlet 113 is connected to the biogas treatment device through a biogas pipe. The biogas produced by fermentation in the fermentation tank 11 enters the biogas treatment device for treatment through the gas outlet 113 and the biogas pipe.

[0036] Multiple first agitators 12 are available, optionally in the form of 2, 3, 4, or 6. These agitators 12 are spaced apart along the lower side wall of the fermentation tank 11, with each agitator 12 extending into the tank. Manure enters the fermentation tank 11 through the inlet 111. The agitators 12 agitate the manure within the tank, ensuring thorough mixing with the existing manure. Furthermore, the agitators 12 are installed at the same height, meaning their agitation shafts are on the same plane. This allows for rapid mixing of the newly entered manure with the existing manure, resulting in high efficiency and preventing manure sedimentation.

[0037] As manure is continuously added, the liquid level in the fermentation tank 11 rises due to the continuous stirring of multiple first agitators 12. In this embodiment, a second agitator 13 is installed at the top of the fermentation tank 11, located on the top side wall. The second agitator 13 extends into the fermentation tank 11 to stir the manure at the top, preventing the formation of a scum layer from the fibers in the manure and facilitating the release of gas within the fermentation tank 11. The first agitators 12 are located between adjacent first agitators 12, increasing the flow of manure within the fermentation tank 11 and ensuring a uniform temperature within the fermentation tank 11. Figure 2 As shown, the projection angle formed by the second stirrer 13 and the first stirrer 12 is 70-110°. Optionally, the projection angle is 70°, 80°, 83°, 90°, 95°, 100°, or 110°.

[0038] It should be noted that the fermentation tank 11 is divided into three parts along the height direction: the lower part, the middle part and the top part. The lower part, which is close to the bottom of the fermentation tank 11, is 1-1.5m high. The top part of the fermentation tank 11 is lower than the highest liquid level of the fermentation tank 11 and can be located 1-1.5m above the highest liquid level of the fermentation tank 11. The middle part of the fermentation tank 11 is located between the bottom and the top of the fermentation tank 11.

[0039] The manure fermentation device 10 provided in this embodiment of the utility model has multiple first stirrers 12 arranged at the lower part of the fermentation tank 11. The height of the multiple first stirrers 12 is equal, so that the manure entering the fermentation tank 11 can be quickly mixed with the existing manure, preventing manure from settling. A second stirrer 13 is arranged at the top of the fermentation tank 11. The second stirrer 13 is located between two adjacent first stirrers 12. The projection angle formed by the second stirrer 13 and the first stirrer 12 is 70-110°, which increases the flow of manure in the fermentation tank 11, makes the temperature in the fermentation tank 11 uniform, prevents the fibers in the manure from forming a scum layer at the top, and helps the gas in the fermentation tank 11 to be released.

[0040] The second stirrer in this embodiment includes a stirring shaft. The angle between the stirring shaft and the liquid surface inside the fermentation tank 11 is 0°-20°, optionally 0° (the stirring shaft is parallel to the liquid surface inside the fermentation tank 11), 5°, 10°, 15°, or 20°. The stirring shaft can rotate upwards or downwards relative to the liquid surface inside the fermentation tank 11, with a rotation range of 0-20°, so as to break the crust at the top of the liquid surface inside the fermentation tank 11 and prevent the crust from affecting the gas release inside the fermentation tank 11.

[0041] like Figure 3 As shown, each of the first agitator 12 and the second agitator 13 includes multiple blades and a stirring shaft. The blades are propeller-type blades, such as... Figure 3 As shown, multiple blades are spirally connected to the stirring shaft, with the spiral angle between the blades and the stirring shaft being 30-60°. Figure 4 As shown; optionally, the helix angle is 30°, 40°, 45°, 50°, 60°, etc.

[0042] Each blade is welded to the stirring shaft, forming a weld between the blade and the stirring shaft. The ratio of the weld length to the maximum width of the corresponding blade is 0.35-0.75, with options including 0.35, 0.38, 0.40, 0.53, 0.60, 0.70, 0.73, and 0.75.

[0043] The manure fermentation device 10 provided in this embodiment of the present invention further includes a heating element 14 and a controller. The heating element 14 is disposed inside the fermentation tank 11, located at the lower part of the fermentation tank 11, and is used to heat the new manure entering through the liquid inlet 111 of the fermentation tank 11, while maintaining a uniform temperature inside the fermentation tank 11. In one embodiment, the heating element 14 includes a heating coil, and the heating coil contains a heating medium, which includes water. Further, multiple first agitators 12, second agitators 13, and the heating element 14 are all electrically connected to the controller, which is used to control the operation of the first agitators 12, second agitators 13, and heating element 14.

[0044] The manure fermentation device 10 also includes a first temperature sensor 15, a second temperature sensor 16, and a third temperature sensor 17. These three sensors are disposed along the height of the fermentation tank 11 within the fermentation tank 11 to detect the temperature inside the fermentation tank 11. Specifically, the first temperature sensor 15 is located at the lower part of the fermentation tank 11 to monitor the temperature at the lower part. The second temperature sensor 16 is located in the middle of the fermentation tank 11 to monitor the temperature in the middle part. The third temperature sensor 17 is located at the top of the fermentation tank 11 to detect the temperature at the top.

[0045] Furthermore, the first temperature sensor 15, the second temperature sensor 16, and the third temperature sensor 17 are all connected to the controller. The controller acquires the temperature distribution of the lower, middle, and top parts of the fermenter 11 to determine the stirring effect of the first stirrer 12 and the second stirrer 13. Based on the current situation, the controller can control the operation of the first stirrer 12, the second stirrer 13, and the heating element 14.

[0046] The manure fermentation device 10 provided in this embodiment of the invention also includes a liquid level sensor 18, which is disposed inside the fermentation tank 11 and used to acquire liquid level information inside the fermentation tank 11. Based on the current liquid level information, the controller can send a signal to the manure collection device 20. When the liquid level reaches a first preset value, the manure collection device 20 stops inputting manure into the fermentation tank 11; when the liquid level is lower than a second preset value, the manure collection device 20 inputs manure into the fermentation tank 11. The first preset value is greater than the second preset value. The liquid level sensor 18 includes a radar liquid level sensor 18. The liquid level sensor 18 can be disposed at the lower part of the fermentation tank 11.

[0047] The manure fermentation device 10 also includes a pressure sensor 19, which is located at the top of the fermentation tank 11 and is used to monitor the pressure in the air chamber above the liquid level in the fermentation tank 11 in real time. A control valve is provided at the air outlet 113 at the top of the fermentation tank 11. Both the control valve and the pressure sensor 19 are electrically connected to the controller. The controller controls the opening and closing of the control valve based on the pressure information from the pressure sensor 19 to prevent excessive pressure in the air chamber.

[0048] The top of the fermentation tank 11 is still equipped with an observation port 117, through which staff can observe the internal condition of the fermentation tank 11. It should be noted that the observation port 117 is equipped with a cover plate, which can be closed to the observation port 117. When observing the condition of the fermentation tank 11, the cover plate is opened.

[0049] The side wall of the fermenter 11 is also provided with a first sampling port 114, a second sampling port 115, and a third sampling port 116. The first sampling port 114 is located at the bottom of the fermenter 11, allowing operators to take samples to detect the concentration at the bottom of the fermenter 11. The second sampling port 115 is located in the middle of the fermenter 11, allowing operators to take samples to detect the concentration at the middle of the fermenter 11. The third sampling port 116 is located at the top of the fermenter 11, allowing operators to take samples to detect the concentration at the top of the fermenter 11. By observing the concentration at different locations within the fermenter 11, operators can determine the stirring status of the first stirrer 12 and the second stirrer 13, and then control the operation of the first stirrer 12 and the second stirrer 13 via a controller.

[0050] Furthermore, a first switching valve is provided at the first sampling port 114 to control the opening and closing of the first sampling port 114. A second switching valve is provided at the second sampling port 115 to control the opening and closing of the second sampling port 115. A third switching valve is provided at the third sampling port 116 to control the opening and closing of the third sampling port 116.

[0051] In this embodiment of the invention, the outer wall surface of the fermentation tank 11 (the outer wall surface includes at least the side wall and the top wall) is also provided with a heat insulation component to keep the fermentation raw materials in the fermentation tank 11 warm and reduce the temperature loss in the fermentation tank 11.

[0052] like Figure 1 As shown, this embodiment of the present invention also provides a manure treatment system, including a manure fermentation device 10 as described in any of the above embodiments, and further including a manure collection device 20 and a discharge tank 30. The outlet of the manure collection device 20 is connected to the liquid inlet 111 of the fermentation tank 11, and the liquid outlet 112 of the fermentation tank 11 is connected to the inlet of the discharge tank 30.

[0053] The manure collection device 20 includes a manure tank 21 and a manure pump 22. The outlet of the manure tank 21 is connected to the inlet 111 of the fermentation tank 11 via a feed pipe. The inlet of the manure pump 22 is located inside the manure tank 21, in contact with the manure inside. The outlet of the manure pump 22 is connected to the inlet 111 of the fermentation tank 11, used to transport the manure from the manure tank 21 to the fermentation tank for fermentation. A fourth temperature sensor 24 is also installed inside the manure tank 21 to obtain the current temperature inside the manure tank 21, thus determining the initial temperature at which the manure enters the fermentation tank 11. A first level gauge 23 is also installed inside the manure tank 21 to obtain the liquid level height inside the manure tank 21. Furthermore, the fourth temperature sensor 24, the first level gauge 23, and the manure pump 22 are all connected to a controller to achieve linkage between the manure collection device 20 and the manure fermentation device 10.

[0054] The discharge tank 30 is also equipped with a biogas slurry pump 31. The inlet of the biogas slurry pump 31 is located inside the discharge tank 30 and comes into contact with the biogas slurry in the discharge tank 30. The outlet of the biogas slurry pump 31 is used to connect to external equipment. The discharge tank 30 is also equipped with a second level gauge 32, which is used to detect the liquid level in the discharge tank 30. Furthermore, both the second level gauge 32 and the biogas slurry pump 31 are electrically connected to a controller to realize the linkage between the discharge tank 30 and the fermentation tank 11.

[0055] In one embodiment, the sewage tank is a reinforced concrete structure, circular or octagonal in shape, with a depth of 4 meters (to ensure effective water depth) and a retention time of more than 4 hours (to ensure continuous and stable operation of subsequent process equipment). The sewage pump 22 is a submersible sewage pump, model 80QW60-20-7.5 (flow rate 60 m³ / h, head 20 m, power 7.5 KW), employing a large-channel single-blade impeller with anti-winding features. The impeller blades are equipped with carbide cutting tips to cut and tear large particles and long fiber debris.

[0056] Fermentation tank 11 is constructed with enamel-coated steel or corrosion-resistant carbon steel. The human-to-human fermentation time (HTR) is 15-20 days to ensure complete fermentation. The outer walls (including side walls and top) of fermentation tank 11 are insulated. Two first agitators 12 are installed at the same height (1.0-1.5m) from the bottom of fermentation tank 11. The models are YB-11KW / FAF87 / FHXL-800. The agitator shaft is 3m long and made of 304 stainless steel. The motor power is 11kW. The impeller is also made of 304 stainless steel, with a rotation diameter of 800mm and a rotation speed of 202rpm. The impeller is specially designed according to the characteristics of the raw materials. The system allows for quick online replacement and maintenance of the mechanical seal without unloading or downtime. The second agitator 13 is a single unit, positioned between the two first agitators 12, with a projected angle of 90° between the second agitator 13 and the first agitator 12. The second agitator 13 is installed 1.5m below the liquid surface and is model YB-11KW / FAF87 / FHXL-800 / KTSX. Its agitator shaft is 3m long and made of 304 stainless steel. The motor power is 11kW. The impeller is made of 304 stainless steel, with a rotation diameter of 800mm and a rotation speed of 202rpm. It features a top-mounted, tilting agitator for breaking up scum in different directions, allowing for material replacement and maintenance.

[0057] The discharge tank 30 is a reinforced concrete structure, and the tank shape is circular or octagonal (built together with the biogas residue and biogas slurry tank). The tank depth is 5 meters (to ensure the effective water depth in the tank), and the retention time is more than 4 hours (to ensure the continuous and stable operation of subsequent process equipment).

[0058] The biogas slurry pump 31 is a submersible sewage pump, model 100QW60-12-3.7 (flow rate 60m³ / h, head 12m, power 3.7KW). It adopts a large-channel single-blade impeller with anti-winding and anti-clogging features. The blades are equipped with carbide cutter heads, which can cut and tear large particles and long fiber debris.

[0059] The following uses blade #1 from this utility model ( Figure 3 ) and the existing blade #2 ( Figure 5 ) and blade #3 ( Figure 6 The stirring time was measured, and the experimental time for each type of impeller was one day (continuous operation). The experimental data are detailed in Table 1 below:

[0060] Table 1 data explanation: Under continuous operation of paddle #1, the temperature at the top of the fermenter was 42.10℃, the temperature in the middle of the fermenter was 41.90℃, and the temperature at the bottom of the fermenter was 41.60℃. The temperature difference between the top and middle manure was 0.2℃, with a deviation rate of (42.10-41.90) / 42.10=0.48%; the temperature difference between the top and bottom manure was 0.5℃, with a deviation rate of (42.10-41.60) / 42.10=1.19%.

[0061] Table 1. Experimental data on fermenter temperature

[0062]

[0063] Under continuous operation of paddle #2, the temperature at the top of the fermenter is 42.10℃, the temperature in the middle of the fermenter is 41.80℃, and the temperature at the bottom of the fermenter is 41.10℃. The temperature difference between the top and middle parts of the manure is 0.3℃, with a deviation rate of (42.10-41.80) / 42.10=0.71%; the temperature difference between the top and bottom parts of the manure is 1.0℃, with a deviation rate of (42.10-41.10) / 42.10=2.38%.

[0064] Under continuous operation of paddle #3, the temperature at the top of the fermenter was 42.10℃, the temperature in the middle of the fermenter was 41.80℃, and the temperature at the bottom of the fermenter was 41.30℃. The temperature difference between the top and middle parts of the manure was 0.3℃, with a deviation rate of (42.10-41.80) / 42.10=0.71%; the temperature difference between the top and bottom parts of the manure was 0.8℃, with a deviation rate of (42.10-41.30) / 42.10=1.90%.

[0065] Based on the data comparison above, it can be proven that: Under continuous operation conditions, blade #1 exhibits the smallest temperature deviation rates between the top and middle sections, and between the top and bottom sections, resulting in the best mixing effect. Under continuous operation conditions, blade #3 shows slightly larger temperature deviation rates between the top and middle sections, and between the top and bottom sections compared to blade #1, resulting in a slightly worse mixing effect. Under continuous operation conditions, blade #2 also shows slightly larger temperature deviation rates between the top and middle sections, and between the top and bottom sections compared to blade #3, resulting in a slightly worse mixing effect.

[0066] Table 2 data explanation: Under continuous operation of paddle #1, the manure concentration at the top of the fermenter is TS=8.85%, the manure concentration in the middle of the fermenter is TS=8.89%, and the manure concentration at the bottom of the fermenter is TS=9.15%. The deviation between the manure concentration at the top and middle is 0.04%, and the deviation rate is (8.89-8.85) / 8.85=0.45%; the deviation between the manure concentration at the top and bottom is 0.30%, and the deviation rate is (9.15-8.85) / 8.85=3.39%.

[0067] Under continuous operation of paddle #2, the manure concentration at the top of the fermenter is TS=8.01%, the manure concentration in the middle of the fermenter is TS=8.95%, and the manure concentration at the bottom of the fermenter is TS=10.05%. The difference between the manure concentration at the top and middle is 0.94%, with a deviation rate of (8.95-8.01) / 8.01=11.73%; the difference between the manure concentration at the top and bottom is 2.04%, with a deviation rate of (10.05-8.01) / 8.01=25.68%.

[0068] Under continuous operation of paddle #3, the manure concentration at the top of the fermenter is TS=8.52%, the manure concentration in the middle of the fermenter is TS=8.81%, and the manure concentration at the bottom of the fermenter is TS=9.57%. The difference between the manure concentration at the top and middle is 0.29%, with a deviation rate of (8.81-8.52) / 8.52=3.40%; the difference between the manure concentration at the top and bottom is 1.05%, with a deviation rate of (9.57-8.52) / 8.52=12.32%.

[0069] Table 2. Experimental data on concentration in the fermenter.

[0070]

[0071] Based on the above data comparison, it can be proved that under the continuous operation of blade #1, the concentration deviation rate between the top and middle parts and between the top and bottom parts is the smallest, and the stirring effect is the best.

[0072] Under continuous operation of impeller #3, the concentration deviation rates between the top and middle sections, and between the top and bottom sections, are slightly larger than those of impeller #1, resulting in a slightly worse mixing effect. Under continuous operation of impeller #2, the concentration deviation rates between the top and middle sections, and between the top and bottom sections, are slightly larger than those of impeller #3, resulting in a slightly worse mixing effect. In summary, using impeller #1 for both the first and second agitators yields the best mixing effect.

[0073] Furthermore, the design angle between the blade of blade #1 and the stirring shaft was verified. Table 3 shows the design parameters of blade #1 and the shaft.

[0074] Table 3 Design parameters of blade #1 and shaft

[0075]

[0076] Table 4 data explanation: After the impeller of blade #1 was improved according to scheme 1, the motor power of the agitator was 7.5Kw. Under continuous operation conditions on site, the temperature at the top of the fermentation tank was 42.10℃, the temperature in the middle of the fermentation tank was 41.60℃, and the temperature at the bottom of the fermentation tank was 41.05℃. The temperature difference between the top and middle manure was 0.5℃, and the deviation rate was (42.10-41.60) / 42.10=1.19%; the temperature difference between the top and bottom manure was 1.05℃, and the deviation rate was (42.10-41.05) / 42.10=2.49%.

[0077] Table 4. Experimental data on fermenter temperature

[0078]

[0079] After the impeller blades of blade #1 were improved according to scheme 2, the motor power of the agitator was 11Kw. Under continuous operation conditions on site, the temperature at the top of the fermentation tank was 42.10℃, the temperature in the middle of the fermentation tank was 41.90℃, and the temperature at the bottom of the fermentation tank was 41.60℃. The temperature difference between the top and middle manure was 0.2℃, and the deviation rate was (42.10-41.90) / 42.10=0.48%; the temperature difference between the top and bottom manure was 0.5℃, and the deviation rate was (42.10-41.60) / 42.10=1.19%.

[0080] After the impeller blades of blade #1 were improved according to scheme 2, the motor power of the agitator was 15Kw. Under continuous operation conditions on site, the temperature at the top of the fermentation tank was 42.10℃, the temperature in the middle of the fermentation tank was 41.91℃, and the temperature at the bottom of the fermentation tank was 41.62℃. The temperature difference between the top and middle manure was 0.19℃, and the deviation rate was (42.10-41.91) / 42.10=0.45%; the temperature difference between the top and bottom manure was 0.48℃, and the deviation rate was (42.10-41.62) / 42.10=1.14%.

[0081] The above data comparison proves that:

[0082] Option 3: The temperature deviation rate between the top and middle, and between the top and bottom, is the smallest, resulting in the best stirring effect.

[0083] Option 2: The temperature deviation rate between the top and middle, and between the top and bottom is slightly larger than that of Option 3, and the stirring effect is slightly worse than that of Option 3.

[0084] Option 1: The temperature deviation rate between the top and middle, and between the top and bottom is slightly larger than that of Option 2, and the stirring effect is slightly worse than that of Option 3.

[0085] Table 5 data explanation: After the impeller of blade #1 was improved according to scheme 1, the motor power of the agitator was 7.5Kw. Under continuous operation conditions on site, the manure concentration at the top of the fermentation tank was TS=8.61%, the manure concentration in the middle of the fermentation tank was TS=8.85%, and the manure concentration at the bottom of the fermentation tank was TS=9.59%. The deviation between the manure concentration at the top and middle was 0.24, and the deviation rate was (8.85-8.61) / 8.61=2.79%; the deviation between the manure concentration at the top and bottom was 0.98%, and the deviation rate was (9.59-8.61) / 8.61=11.38%.

[0086] Table 5. Experimental data on concentration in the fermenter.

[0087]

[0088] After the impeller of blade #1 was improved according to scheme 2, the motor power of the agitator was 11Kw. Under continuous operation conditions on site, the manure concentration at the top of the fermentation tank was TS=8.85%, the manure concentration in the middle of the fermentation tank was TS=8.89%, and the manure concentration at the bottom of the fermentation tank was TS=9.15%. The deviation between the manure concentration at the top and middle was 0.04%, and the deviation rate was (8.89-8.85) / 8.85=0.45%; the deviation between the manure concentration at the top and bottom was 0.3%, and the deviation rate was (9.15-8.85) / 8.85=3.34%.

[0089] After the impeller of blade #1 was improved according to scheme 2, the motor power of the agitator was configured to be 15Kw. Under continuous operation conditions on site, the manure concentration at the top of the fermentation tank was TS=8.86%, the manure concentration in the middle of the fermentation tank was TS=8.89%, and the manure concentration at the bottom of the fermentation tank was TS=9.12%. The difference between the manure concentration at the top and middle was 0.03%, and the deviation rate was (8.89-8.86) / 8.86=0.34%; the difference between the manure concentration at the top and bottom was 0.26%, and the deviation rate was (9.12-8.86) / 8.86=2.93%.

[0090] Based on the data comparison above, it can be proven that: Scheme 3 has the smallest concentration deviation rate between the top and middle sections, and between the top and bottom sections, resulting in the best stirring effect. Scheme 2 has a slightly larger concentration deviation rate between the top and middle sections, and between the top and bottom sections, resulting in a slightly worse stirring effect than Scheme 3. Scheme 1 has a slightly larger concentration deviation rate between the top and middle sections, and between the top and bottom sections, than Scheme 2, resulting in a slightly worse stirring effect than Scheme 3.

[0091] When the deflection angle of the agitator blades and the agitator shaft is designed according to Scheme 3, the agitation effect is optimal. The agitation effect of Scheme 3 and Scheme 2 is not significantly different, and the temperature and concentration distribution of Scheme 2 can meet the process requirements. Scheme 3 uses a 15kW motor, while Scheme 2 uses an 11kW motor. Considering the economic efficiency of the schemes, this experiment determined Scheme 2 to be the best option.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A manure fermentation apparatus, characterized by comprising: The fermentation tank comprises: a fermentation tank; a plurality of first agitators, which are arranged at the lower sidewall of the fermentation tank in a circumferential direction, each of the first agitators extends into the fermentation tank, and the installation heights of the first agitators are the same; a second agitator, which is arranged at the top sidewall of the fermentation tank and extends into the fermentation tank; the second agitator is located between two adjacent first agitators, and the projection angle between the second agitator and the first agitators is 70-110°.

2. The manure fermentation apparatus according to claim 1, characterized by The second agitator comprises an agitator shaft, and the angle between the agitator shaft and the liquid surface in the fermentation tank is 0-20°.

3. The manure fermentation apparatus according to claim 1, characterized by The first agitator and the second agitator each further comprise a plurality of paddles and an agitator shaft, and the plurality of paddles are spirally connected to the agitator shaft. The spiral angle of the paddles relative to the agitator shaft is 30-60°, each of the paddles is welded to the agitator shaft, and the ratio of the length of the weld to the maximum width of the corresponding paddle is 0.35-0.

75.

4. The manure fermentation apparatus according to claim 1, characterized by The fermentation tank further comprises a heating element and a controller, the heating element is arranged in the fermentation tank and located at the lower part of the fermentation tank, and the first agitators, the second agitator, and the heating element are electrically connected to the controller. The fermentation tank further comprises a first temperature sensor, a second temperature sensor, and a third temperature sensor, which are arranged in the fermentation tank, the first temperature sensor is arranged at the lower part of the fermentation tank, the second temperature sensor is arranged at the middle part of the fermentation tank, and the third temperature sensor is arranged at the top part of the fermentation tank.

5. The manure fermentation apparatus according to claim 4, characterized in that The first temperature sensor, the second temperature sensor, and the third temperature sensor are electrically connected to the controller. The fermentation tank further comprises a liquid level sensor, which is arranged in the fermentation tank and electrically connected to the controller.

6. The manure fermentation apparatus according to claim 4, characterized by The fermentation tank further comprises a pressure sensor, which is arranged at the top part of the fermentation tank and electrically connected to the controller. The fermentation tank further comprises an inlet and an outlet, the inlet is arranged at the lower part of the fermentation tank and used for communicating with a fecal waste collecting device, the outlet is used for communicating with a discharge tank, the top part of the fermentation tank is provided with an outlet, and the outlet is used for communicating with a biogas treatment device.

7. The manure fermentation apparatus according to claim 1, characterized by The top part of the fermentation tank is further provided with an observation port. The sidewall of the fermentation tank is further provided with a first sampling port, a second sampling port, and a third sampling port, the first sampling port is arranged at the lower part of the fermentation tank, the second sampling port is arranged at the middle part of the fermentation tank, and the third sampling port is arranged at the top part of the fermentation tank.

8. The manure fermentation apparatus according to claim 1, characterized by The fermentation tank further comprises a heat preservation element, which covers the outer wall surface of the fermentation tank.

9. The manure fermentation apparatus according to claim 1, characterized by The fecal waste fermentation device comprises the fermentation tank, a fecal waste collecting device, and a discharge tank.

10. A faecal matter treatment system characterised in that, The fecal waste collecting device comprises a fecal waste tank, the outlet of the fecal waste tank is connected to the inlet of the fermentation tank, and the outlet of the fermentation tank is connected to the inlet of the discharge tank. ​

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