Engineered biogas fermentation apparatus and methods
By feeding liquid and solid fermentation materials separately, combined with automated control and a mixer, the problems of methane emissions and energy loss in biogas projects have been solved, and the stable operation and efficient fermentation of the fermentation device have been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BIOGAS SCI RES INST MIN OF AGRI
- Filing Date
- 2023-09-28
- Publication Date
- 2026-06-02
AI Technical Summary
In existing biogas projects, fermentation feedstocks are prone to forming anaerobic zones during storage and feeding, leading to fugitive methane emissions and energy loss. Furthermore, the feeding methods are complex and unstable.
The liquid and solid fermentation materials are fed separately, and the process is automated through a homogenizing tank and a conveyor. The liquid fermentation material is directly conveyed through the inlet, while the solid fermentation material is conveyed by a conveyor belt. Combined with a stirrer, the formation of an anaerobic zone is avoided, and the materials are mixed in the fermentation device.
It effectively reduces methane emissions during the storage and feeding of fermentation materials, improves fermentation efficiency and energy efficiency, and ensures stable operation within the fermentation unit.
Smart Images
Figure CN117143721B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a large-scale engineered biogas fermentation device and method for improving methane collection efficiency, belonging to the fields of energy, agriculture and environmental engineering technology. Background Technology
[0002] Large-scale biogas projects can be used for the comprehensive treatment of livestock and poultry manure, rural waste biomass, and urban and rural domestic waste. As an important emission reduction and efficiency-enhancing technology for the efficient treatment and development of clean energy, it can help achieve the ecological intensification of photosynthesis and the recarbonization of agricultural ecosystems. It is the most powerful tool to support the ecological transformation of agriculture and is considered one of the most promising carbon development projects. On the one hand, biogas fermentation is the most effective means of controlling greenhouse gas emissions from agricultural waste; on the other hand, biogas replacing fossil fuels for power and heating, and returning biogas residue and slurry to the fields to replace chemical fertilizers for fertilizing farmland, can greatly reduce carbon emissions from agriculture and rural areas.
[0003] Because biogas projects involve a wide range of fermentation feedstock collection, if the residence time before collection, storage, and feeding is too long, an anaerobic zone will form outside the fermentation device. This will cause a large amount of organic matter to be converted into methane, resulting in a large amount of fugitive methane emissions. Methane's greenhouse effect is 25 times that of carbon dioxide. In addition, the large amount of organic matter degraded into biogas outside the biogas fermentation device will also reduce the energy production efficiency of large-scale biogas projects.
[0004] Before entering the fermentation tank, most raw materials require pretreatment to ensure the stable operation of the anaerobic fermentation system. Due to the varying collection channels and physicochemical properties of different raw materials in biogas projects, and the varying processing requirements and transportation methods for different digestion processes, the pretreatment process is not only complex but also presents challenges in timely feeding. Currently, large-scale biogas projects using easily perishable organic matter such as livestock and poultry manure as the main raw material generally involve first mixing the manure in a homogenizing tank before feeding it into the fermentation tank. However, due to fluctuations in the amount of raw material, some fermentation raw materials often accumulate in the homogenizing tank, forming an anaerobic zone. This results in the fermentation raw materials undergoing anaerobic digestion within the homogenizing tank, producing biogas (methane content 55-65%) which is then directly emitted into the air. Summary of the Invention
[0005] The purpose of this invention is to overcome the aforementioned problems in the existing technology and provide an engineered biogas fermentation device and method. This invention can reduce methane emissions during the storage of fermentation materials at the site and energy efficiency losses caused by the ineffective degradation of fermentation materials; while providing high-quality fermentation raw materials for biogas projects, it achieves effective quality preservation and emission reduction.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0007] An engineered biogas fermentation device is characterized by comprising a liquid fermentation material feeding mechanism and a solid fermentation material feeding mechanism. The liquid fermentation material feeding mechanism includes a homogenizing tank with a stirrer in the middle. The homogenizing tank is connected to the feed inlet of the fermentation device via a liquid inlet pipe. When the liquid level in the homogenizing tank reaches a set height, the liquid fermentation material in the homogenizing tank is automatically conveyed to the fermentation device through the liquid inlet pipe. The solid fermentation material feeding mechanism includes a feeding hopper and a conveying device. The conveying device includes a motor and a conveyor belt driven by the motor. The feeding hopper is mounted on the conveyor belt, which includes an external conveyor belt outside the fermentation device and an internal conveyor belt inside the fermentation device. The highest point of the internal conveyor belt is higher than the fermentation liquid level, and the lowest point is above the feed inlet. The solid fermentation material conveyed by the feeding hopper is discharged at the lowest point of the internal conveyor belt. After entering the feeding hopper, the solid fermentation material is fed into the fermentation device as needed via the conveying device. The liquid fermentation material feeding mechanism and the solid fermentation material feeding mechanism cooperate to form a mixing zone with two feeding directions at the bottom of the fermentation device. A methane gas collection pipe is provided at the top of the fermentation device.
[0008] The homogenizing tank is also equipped with a grid channel at the front end for filtering the liquid fermentation material, and the grid channel is connected to the feed inlet of the homogenizing tank.
[0009] The conveyor belt of the conveying device extends from the sealed box at the top of the fermentation device into and out of the fermentation device. The outward extension forms an external conveyor belt that conveys upwards, and the inward extension forms an internal conveyor belt that conveys downwards.
[0010] The conveyor belt is equipped with a metering device. When the set feeding time is reached, the conveyor belt is started and stopped according to the feeding plan to feed the material according to the plan.
[0011] The homogenizing tank is equipped with a liquid level limit position inside, and the outlet of the homogenizing tank is located at the liquid level limit position. When the internal liquid level reaches the limit position, the inlet pipe starts feeding, conveying liquid fermentation material to the fermentation device until the homogenizing tank is emptied.
[0012] The inlet pipe is equipped with a manual valve and a metering device.
[0013] A fermentation method for an engineered biogas fermentation device, characterized by comprising the following steps:
[0014] a. Liquid fermentation material conveying: Liquid fermentation material is fed into the fermentation device through the inlet pipe of the homogenizing tank. When liquid fermentation material enters the homogenizing tank, the agitator automatically stirs it. When the liquid level reaches the set height, it is automatically conveyed to the fermentation device through the inlet pipe until the homogenizing tank is emptied. The amount of liquid fermentation material fed in is measured by the metering device of the inlet pipe.
[0015] b. Solid fermentation material conveying: When it is necessary to convey solid fermentation material, the conveyor belt will start automatically and convey the solid fermentation material in the feed hopper to the fermentation device;
[0016] c. The solid fermentation material entering the fermentation device is stirred evenly by feeding liquid fermentation material, and then transported to various parts of the fermentation tank by the carrying action to achieve the purpose of uniform material distribution before fermentation treatment in the fermentation device.
[0017] The biogas produced in the fermentation device is output through the methane gas collection pipe at the top of the fermentation device and enters the biogas pipeline network for utilization.
[0018] In step a, the liquid fermentation material transported by the material transport vehicle is first sent into the grid channel to filter out impurities, and then enters the homogenization tank from the feed inlet of the homogenization tank. The filtered liquid fermentation material is then sent to the fermentation device from the liquid inlet pipe.
[0019] In step b, the feed amount of solid fermentation material is calculated based on the feed amount of liquid fermentation material measured in step a, and the material is fed as needed.
[0020] The advantages of using this invention are:
[0021] 1. In this invention, the feeding method of fermentation materials has been changed from uniform feeding into the homogenization tank for uniform mixing and conveying to feeding liquid fermentation materials through the feed inlet of the fermentation device, while solid fermentation materials are conveyed to the bottom through an automatic conveying device connected to the outer side and the inside of the fermentation device, opposite to the feed inlet of the fermentation device at the bottom. This separates the feeding of liquid and solid fermentation materials, effectively avoiding the formation of anaerobic zones and the release of large amounts of biogas outside the fermentation device. It also reduces the amount of liquid fermentation materials and the residence time outside the fermentation device, thus reducing the amount of methane emitted during the process.
[0022] 2. In this invention, a stirrer is installed in the homogenizing tank to mix the materials and prevent sediment from forming at the bottom of the tank. The more sediment at the bottom of the homogenizing tank, the more anaerobic zones are formed. The stirrer eliminates these anaerobic zones and the mixture is then quickly transported to the fermentation device. At the same time, the solid fermentation material is fed separately, which greatly reduces the organic matter concentration in the homogenizing tank. The stirring process thoroughly removes the material from the fermentation equipment, resulting in a significant reduction in methane emissions.
[0023] 3. In this invention, the fermentation device is a closed space. When the liquid fermentation material in the homogenization tank is transported to the fermentation device, any solid fermentation material at the bottom of the fermentation device will be deposited at the bottom and mixed with the liquid fermentation material transported by the liquid inlet pipe to ensure thorough mixing and fermentation.
[0024] 4. The conveying device in this invention is a fully automated conveying device. It calculates the feed of solid fermentation material according to the feed amount measured by the liquid inlet pipe and feeds the material as needed. After the liquid fermentation material in the homogenization tank reaches the set height value, it will be automatically conveyed to the fermentation device. Attached Figure Description
[0025] Figure 1 A schematic diagram of the basic structure of a biogas engineering device;
[0026] Figure 2 A schematic diagram of the improved biogas engineering device;
[0027] Figure 3 This is a schematic diagram of the final improved biogas engineering device structure of the present invention;
[0028] The markings in the diagram are: 1. Material transport vehicle; 2. Grating channel; 3. Homogenizing tank; 4. Liquid inlet pipe; 5. Agitator; 6. Feed inlet; 7. Fermentation device; 8. Methane gas collection pipe; 9. Fermentation liquid surface; 10. Conveying device; 11. Feed funnel. Detailed Implementation
[0029] Example 1
[0030] An engineered biogas fermentation device includes a liquid fermentation material feeding mechanism and a solid fermentation material feeding mechanism. The liquid fermentation material feeding mechanism includes a homogenizing tank 3, with a stirrer 5 installed in the middle of the homogenizing tank 3. The homogenizing tank 3 is connected to the feed inlet 6 of the fermentation device 7 through a liquid inlet pipe 4. When the liquid level in the homogenizing tank 3 reaches a set height (usually the minimum starting liquid level of the feed pump), the liquid fermentation material in the homogenizing tank 3 is automatically conveyed to the fermentation device 7 through the liquid inlet pipe 4. The solid fermentation material feeding mechanism includes a feed funnel 11 and a conveyor device 10. The conveyor device 10 includes a motor and a conveyor belt driven by the motor. The funnel 11 is set on the conveyor belt, which includes an external conveyor belt outside the fermentation device 7 and an internal conveyor belt inside the fermentation device 7. The highest point of the internal conveyor belt is higher than the fermentation liquid surface 9, and the lowest point is above the feed inlet 6. The solid fermentation material conveyed by the feeding funnel 11 is discharged at the lowest point of the internal conveyor belt. After entering the feeding funnel 11, the solid fermentation material is fed into the fermentation device 7 as needed through the conveyor device 10. The liquid fermentation material feeding mechanism and the solid fermentation material feeding mechanism cooperate to form a mixing zone with two feeding directions at the bottom of the fermentation device 7. The top of the fermentation device 7 is equipped with a methane gas collection pipe 8.
[0031] The above structure enables solid fermentation materials to be fed into the fermentation device 7 as needed by the conveying device 10 after entering the feeding funnel 11; while liquid fermentation materials are fed into the fermentation device 7 in real time through the feeding port 6. Liquid fermentation materials can be fed into the fermentation device 7 in a timely manner, avoiding the formation of an anaerobic zone in the homogenization tank 3, and converting the fermentation materials into biogas, which is then released into the air.
[0032] Fermentation device 7 can be a fermentation tank. Solid fermentation materials include biogas residue, large pieces of material, etc., while liquid fermentation materials include biogas slurry, etc.
[0033] The homogenizing tank 3 is also equipped with a grid channel 2 for filtering liquid fermentation materials at its front end, and the grid channel 2 is connected to the feed inlet of the homogenizing tank.
[0034] The conveyor belt of the conveying device 10 extends into and out of the fermentation device 7 through the sealed box at the top of the fermentation device 7. The outward extension forms an external conveyor belt that conveys upwards, and the inward extension forms an internal conveyor belt that conveys downwards.
[0035] The conveyor belt is equipped with a metering device. When the set feeding time is reached, the conveyor belt is started and stopped according to the feeding plan to feed the material according to the plan.
[0036] The homogenizing tank 3 has a liquid level limit position inside, and the outlet of the homogenizing tank 3 is located at the liquid level limit position. When the internal liquid level reaches the limit position, the inlet pipe 4 starts feeding and conveys liquid fermentation material to the fermentation device 7 until the homogenizing tank 3 is emptied.
[0037] The inlet pipe 4 is equipped with a manual valve and a metering device.
[0038] A fermentation method for an engineered biogas fermentation device includes the following steps:
[0039] a. Liquid fermentation material conveying: Liquid fermentation material is fed into the fermentation device 7 through the liquid inlet pipe 4 in the homogenizing tank 3. When liquid fermentation material enters the homogenizing tank 3, the agitator 5 automatically stirs it. When the liquid level reaches the set height, it is automatically conveyed to the fermentation device 7 through the liquid inlet pipe 4 until the homogenizing tank 3 is emptied. The amount of liquid fermentation material fed in is measured by the metering device in the liquid inlet pipe 4.
[0040] b. Solid fermentation material conveying: When it is necessary to convey solid fermentation material, the conveyor belt will start automatically and convey the solid fermentation material in the feed hopper 11 to the fermentation device 7.
[0041] c. The solid fermentation material entering the fermentation device 7 is stirred evenly by feeding liquid fermentation material, and then transported to various parts of the fermentation tank by the carrying action to achieve the purpose of uniform material distribution, and then fermentation is carried out in the fermentation device 7.
[0042] The biogas produced in the fermentation device 7 is output through the methane gas collection pipe 8 at the top of the fermentation device 7 and enters the biogas pipeline network for utilization.
[0043] In step a, the liquid fermentation material transported by the material transport vehicle 1 is first sent into the grid channel 2 to filter out impurities, and then enters the homogenization tank 3 from the homogenization tank inlet. The filtered liquid fermentation material is sent to the fermentation device 7 from the liquid inlet pipe 4.
[0044] In step b, the feed amount of solid fermentation material is calculated based on the feed amount of liquid fermentation material measured in step a, and the material is fed as needed. The feed ratio of liquid fermentation material to solid fermentation material can be the same as the solid-liquid ratio used in existing biogas fermentation.
[0045] This invention overcomes the problems of messy feeding methods, unclear feeding distinctions, uneven size distribution of fermented materials during the operation of the homogenization tank 3, and dispersed methane emissions in biogas engineering. It reduces methane emissions and energy efficiency losses of fermented materials during the "collection-storage-transport" process, and improves the stability of large-scale biogas engineering production and use.
[0046] Example 2
[0047] This embodiment, in conjunction with the accompanying drawings, further illustrates the present invention. The main objective of this invention is to solve feeding problems such as imperfections in the fermentation material feeding method, unclear feeding distribution, and unstable methane emissions during biogas project operation, thereby improving energy conservation and emission reduction efficiency.
[0048] like Figure 1 As shown, the biogas project's feeding method involves a transport vehicle entering the homogenizing tank through the inlet. Inside the homogenizing tank, the materials are mixed by two agitators and then directly transported to the fermentation unit through a liquid inlet pipe at the bottom. The transport vehicle itself contains biogas residue, which is separated from other fermentation materials by a grid channel at the inlet before being conveyed to the fermentation unit. Inside the homogenizing tank, the fermentation materials and sediment are mixed by agitators before entering the fermentation tank. Its advantage is that it allows for unified transport to the homogenizing tank and then to the fermentation unit; however, this process releases methane gas into the atmosphere, making it not a very effective method for reducing emissions.
[0049] like Figure 2 As shown, from the feed inlet to the homogenizing tank, two mixers inside the homogenizing tank mix the sediment deposited in the bottom anaerobic zone with the newly arrived fermentation material. The homogenizing tank has two pipes connected to two points at the bottom, allowing for the transport of a large quantity of the bottom mixture from the inlet pipe. Two branch pipes also allow for the phased transport of the bottom mixture. Its key feature is that it effectively disperses the anaerobic zone at the bottom of the biogas residue and slurry in the homogenizing tank and pumps it into the fermentation device, enabling continuous and multiple feed collection.
[0050] like Figure 3 As shown above, in the above Figure 1 and Figure 2Based on this, the large-scale biogas engineering device of the present invention is finally derived, including a fermentation device 7, a homogenizing tank 3, a material transport vehicle 1, a conveying device 10, and a feeding funnel 11. The feeding port 6 of the fermentation device is connected to the homogenizing tank 3. The homogenizing tank 3 is equipped with a stirrer 5 and has an upper limit for the liquid level. When a certain level is reached, the liquid inlet pipe 4 at the bottom of the homogenizing tank 3 will connect to the fermentation device 7 for transmission. The fermentation device 7 is equipped with a feeding funnel 11 on the outside. When biogas residue is put into the feeding funnel 11, the biogas residue in the funnel will be automatically transported into the fermentation device 7.
[0051] A conveyor device 10 and a feed funnel 11 are installed primarily to separate the feeding of biogas residue, large solid fermentation materials, and liquid fermentation materials. The liquid fermentation material, transported by the conveyor 1, enters through the inlet of the homogenizing tank 3, forming a mixture with the liquid inside the homogenizing tank 3. The liquid fermentation material itself contains some residue, which mixes with the sediment in the bottom anaerobic zone, and the volume of residue within the liquid fermentation material is relatively small. Meanwhile, the solid fermentation materials, such as biogas residue, are fed into the feed funnel 11 and conveyed to the top side of the fermentation device via a conveyor belt. Through a sealed space, the biogas residue is transported from the feed funnel 11 to the liquid fermentation material entering through the inlet pipe 4 connected to the bottom of the homogenizing tank 3, where it is mixed with the liquid fermentation material. This solid-liquid separation feeding method significantly reduces methane emissions from the mixing of fermentation materials, and also prevents blockages and large amounts of floating matter within the homogenizing tank 3.
[0052] Both the conveyor 10 and the feed hopper 11 are automatic machines. When the set requirements are met, the machines will run automatically to ensure the smooth operation of the biogas project.
[0053] Because this invention solves the problems of imperfect feeding methods in existing biogas projects, poor internal operation of the biogas project homogenizing tank 3, and unstable methane emissions during biogas project operation, it promotes the stable development of biogas project feeding methods, improves the reduction of methane emissions, and makes effective measures to improve the feeding of biogas residue and biogas slurry, thus further advancing the energy conservation and emission reduction work of large-scale biogas projects.
[0054] Example 3
[0055] like Figure 3 As shown, in the large-scale engineered biogas fermentation device and method, the liquid fermentation material of the transport vehicle 1 is transported to the homogenization tank 3 through the inlet of the homogenization tank. The grid channel 2 is placed above the inlet of the homogenization tank to block other biogas residue and large pieces of material. The agitator 5 is located in the middle of the homogenization tank 3 for easy stirring. The homogenization tank 3 is connected to the fermentation device 7 through the liquid inlet pipe 4. The fermentation device 7 is equipped with a conveying device 10 and a feeding funnel 11 on the side. The fermentation device 7 is equipped with a methane gas collection pipe 8 at the top.
[0056] The conveyor belt of the conveying device 10 is distributed to two locations through the sealed box on the side and top of the fermentation device 7, moving upwards and downwards respectively.
[0057] The feed hopper 11 is connected to the conveyor belt, and the conveyor belt starts automatically when the set plan is reached.
[0058] The homogenizing tank 3 is equipped with a liquid level limit. When the liquid level inside reaches the set height, the inlet pipe 4 will transport the mixed liquid in the tank to the fermentation device 7.
[0059] The methane gas collection pipe 8 installed at the top of the fermentation device 7 will release some gas appropriately when the methane gas inside the fermentation device 7 reaches a certain height, so as to prevent the internal pressure from being too great.
[0060] The inlet pipe 4 is equipped with a manual valve, which can be used to control the operation at any time when necessary.
[0061] The above-mentioned method for reducing methane emissions in large-scale biogas engineering devices includes the following steps:
[0062] The pressure generated by methane inside the fermentation unit will be discharged to the outside through the methane gas collection pipe 8 at the top of the fermentation unit, ensuring the stability of methane gas and biogas slurry inside the fermentation unit.
[0063] Liquid fermentation material is fed into the fermentation device through the inlet pipe 4 in the homogenizing tank 3. The concentrations of methane, hydrogen sulfide and carbon dioxide are different in different positions of the homogenizing tank 3. When biogas slurry enters from the inlet of the homogenizing tank, the agitator 5 will automatically stir it. When the liquid level reaches the highest point, it will be automatically transported to the fermentation device through the inlet pipe 4.
[0064] When solid fermentation material needs to be transported, the conveyor belt starts automatically, transporting the solid fermentation material in the feed hopper 11 to the fermentation device. The liquid fermentation material and the solid fermentation material are fully mixed at the bottom of the fermentation device, which reduces the dispersion of methane emissions.
[0065] The conveyor 10 connected to the fermentation device will automatically load and transport the biogas residue into the fermentation device via the conveyor belt according to the plan when it is fed into the conveyor funnel.
Claims
1. An engineered biogas fermentation device, characterized in that: The system includes a liquid fermentation material feeding mechanism and a solid fermentation material feeding mechanism. The liquid fermentation material feeding mechanism includes a homogenizing tank (3), with a stirrer (5) installed in the middle of the homogenizing tank (3). The homogenizing tank (3) is connected to the feed inlet (6) of the fermentation device (7) through a liquid inlet pipe (4). When the liquid level in the homogenizing tank (3) reaches a set height, the liquid fermentation material in the homogenizing tank (3) is automatically conveyed to the fermentation device (7) through the liquid inlet pipe (4). The solid fermentation material feeding mechanism includes a feeding funnel (11) and a conveying device (10). The conveying device (10) includes a motor and a conveyor belt driven by the motor. The feeding funnel (11) is set on the conveyor belt. The conveyor belt includes an external conveyor belt located outside the fermentation device (7) and an internal conveyor belt located inside the fermentation device (7). The highest point of the internal conveyor belt is higher than the fermentation liquid level (9), and the lowest point is located above the feed inlet (6). The solid fermentation material conveyed by the feeding funnel (11) is discharged at the lowest point of the internal conveyor belt. After the solid fermentation material enters the feeding funnel (11), it is fed into the fermentation device (7) as needed through the conveying device (10); the liquid fermentation material feeding mechanism and the solid fermentation material feeding mechanism cooperate to form a mixing zone with two feeding directions at the bottom of the fermentation device (7), and the top of the fermentation device (7) is equipped with a methane gas collection pipe (8); the conveyor belt of the conveying device (10) extends into and out of the fermentation device (7) through the sealed box at the top of the fermentation device (7), extending outward to form an external conveyor belt that conveys upward, and extending inward to form an internal conveyor belt that conveys downward; the conveyor belt is equipped with a metering device, and when the set feeding time is reached, the conveyor belt is started and stopped according to the feeding plan to feed according to the plan; the homogenization tank (3) is equipped with a liquid level limit position, and the outlet of the homogenization tank (3) is located at the liquid level limit position. When the internal liquid level reaches the limit position, the inlet pipe (4) starts feeding and conveys liquid fermentation material to the fermentation device (7) until the homogenization tank (3) is emptied.
2. The engineered biogas fermentation device according to claim 1, characterized in that: The homogenizing tank (3) is also equipped with a grid channel (2) for filtering liquid fermentation materials at the front end, and the grid channel (2) is connected to the feed inlet of the homogenizing tank.
3. The engineered biogas fermentation device according to claim 2, characterized in that: The inlet pipe (4) is equipped with a manual valve and a metering device.
4. The fermentation method of an engineered biogas fermentation device according to claim 3, characterized in that, Includes the following steps: Step a, Liquid fermentation material conveying: Liquid fermentation material is fed into the fermentation device (7) through the liquid inlet pipe (4) of the homogenizing tank (3). When liquid fermentation material enters the homogenizing tank (3), the stirrer (5) automatically stirs. When the liquid level reaches the set height, it is automatically conveyed to the fermentation device (7) through the liquid inlet pipe (4) until the homogenizing tank (3) is emptied. The amount of liquid fermentation material fed is measured by the metering device of the liquid inlet pipe (4). Step b, solid fermentation material conveying: When solid fermentation material needs to be conveyed, the conveyor belt will start automatically and convey the solid fermentation material in the feed hopper (11) to the fermentation device (7); Step c: The solid fermentation material entering the fermentation device (7) is stirred evenly by feeding liquid fermentation material, and then transported to various parts of the fermentation device (7) by carrying action to achieve the purpose of uniform material distribution, and then fermentation is carried out in the fermentation device (7).
5. The fermentation method of an engineered biogas fermentation device according to claim 4, characterized in that: The biogas generated in the fermentation device (7) is output through the methane gas collection pipe (8) at the top of the fermentation device (7) and enters the biogas pipeline network for utilization.
6. The fermentation method of an engineered biogas fermentation device according to claim 5, characterized in that... In step a, the liquid fermentation material transported by the material transport vehicle is first sent into the grid channel (2) to filter out impurities, and then enters the homogenization tank (3) from the homogenization tank inlet. The filtered liquid fermentation material is sent to the fermentation device (7) from the liquid inlet pipe (4).
7. The fermentation method of an engineered biogas fermentation device according to claim 6, characterized in that... In step b, the amount of solid fermentation material to be fed is calculated based on the amount of liquid fermentation material fed in step a, and the material is fed as needed.