Mechanical-stirring-free low-temperature anaerobic giant underground reaction tank

Abstract

The utility model provides a mechanical-stirring-free low-temperature anaerobic giant underground reaction tank which comprises a reaction tank, a material distribution unit and a biogas collection unit, and geotechnical impermeable membranes are laid at the bottom, a dam and the top of the reaction tank; the material distributing unit comprises a material main pipeline and a plurality of discharging pipes, one side of the material main pipeline is connected with a feeding pipe, the other side of the material main pipeline is connected with a discharging pipe, a centrifugal pump is installed on the feeding pipe, a rotor pump is installed on the discharging pipe, and a material circulating pipe is further connected between the discharging pipe and the material main pipeline; the biogas collecting unit comprises a biogas collecting header pipe and a biogas collecting branch pipe, one side of the biogas collecting header pipe is connected with a biogas output pipe, and the biogas output pipe is connected with a Roots blower and a biogas output valve. The device is low in construction cost, integrates the functions of anaerobic reaction, biogas collection, material mixing circulation and the like, can stably run for a long time, and is suitable for being applied to farms in various places.

Description

Technical Field

[0001] This utility model belongs to the field of anaerobic fermentation equipment, and in particular relates to a low-temperature anaerobic giant underground reaction tank without mechanical stirring. Background Technology

[0002] With the trend of large-scale livestock and poultry farming, centralized treatment of livestock and poultry manure has become a necessary measure. If it is discharged without effective treatment, it will pollute water bodies, air and soil, and at the same time pose risks of breeding bacteria, spreading diseases and endangering people's health.

[0003] Biogas fermentation is a common method for treating livestock and poultry manure. Also known as anaerobic digestion or anaerobic fermentation, it refers to the process by which organic matter (such as human and livestock manure, straw, weeds, etc.) is decomposed and metabolized by various microorganisms under certain moisture, temperature and anaerobic conditions, ultimately forming biogas. Biogas fermentation requires a special fermentation tank for treatment.

[0004] Existing biogas fermentation equipment mostly uses fermentation tanks to store and ferment organic raw materials. The fermentation tanks have limited volume and high construction costs, which is not conducive to their widespread application. Summary of the Invention

[0005] This invention addresses the technical problems of limited volume and high construction cost of existing biogas fermentation equipment by proposing a large-volume, non-mechanically stirred, low-temperature anaerobic storage integrated tank that can store fermented organic matter for a long time and operate stably for a long time.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A non-mechanically stirred, low-temperature anaerobic giant underground reaction tank includes a reaction tank, a material distribution unit, and a biogas collection unit. The bottom of the reaction tank and the dam are covered with a geomembrane to prevent the fermentation raw materials from seeping into the soil and polluting the groundwater.

[0008] The material distribution unit includes a main material pipeline arranged around the dam, with multiple discharge pipes connected to the main material pipeline. One side of the main material pipeline is connected to an inlet pipe, and the other side is connected to an outlet pipe. A centrifugal pump is installed on the inlet pipe, and a rotor pump is installed on the outlet pipe. A material circulation pipe is also connected between the outlet pipe and the main material pipeline.

[0009] The biogas collection unit includes a biogas collection main pipe arranged around the top of the reaction tank and biogas collection branch pipes connected to the biogas collection main pipe. A biogas output pipe is connected to one side of the biogas collection main pipe. A Roots blower and a biogas output valve are connected to the biogas output pipe. Bypass pipes located on both sides of the Roots blower are also connected to the biogas collection main pipe. The bypass pipes are all connected to the biogas output pipe at the position between the Roots blower and the biogas output valve.

[0010] Preferably, the discharge pipe extends downward to the bottom of the reaction tank.

[0011] Preferably, the multiple discharge pipes are distributed inside the reaction tank.

[0012] Preferably, the biogas collection branch pipes are provided in multiple sections and distributed at the top of the reaction tank.

[0013] Preferably, both the discharge pipe and the biogas collection branch pipe are equipped with solenoid valves.

[0014] Preferably, the main material pipeline is equipped with multiple supernatant drain pipes.

[0015] Preferably, the lower ends of the different supernatant drain pipes extend to different depths in the middle of the reaction tank.

[0016] Preferably, a solenoid valve is installed on the supernatant drain pipe.

[0017] Preferably, the depth of the reaction tank is 7-8 meters.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0019] 1. The novel low-temperature anaerobic giant underground reactor without mechanical stirring uses pumps and pipelines to drive the flow of biogas slurry, thereby forming a material circulation system that simultaneously draws in and releases the slurry, avoiding sludge deposition in the reactor and ensuring long-term stable operation of the reactor.

[0020] 2. The biogas collection unit is equipped with a backflushing mechanism, which can clean the main biogas collection pipe and the branch pipes to prevent condensate from freezing and clogging the pipes;

[0021] 3. It has a sunken structure, which can utilize the waste heat of materials and ground temperature to improve the comprehensive energy utilization rate; its volume can reach more than 20,000 cubic meters, and it also has the function of long-term storage of biogas fertilizer, which can meet the seasonal needs of agricultural production.

[0022] 4. This utility model of a non-mechanically stirred, low-temperature anaerobic giant underground reactor has low construction cost and integrates functions such as anaerobic reaction, biogas collection, and material mixing and circulation, making it suitable for application in farms across various regions. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the material distribution unit structure of the mechanically stirred, low-temperature anaerobic giant underground reaction tank of this utility model.

[0024] Figure 2 This is a schematic diagram of the biogas collection unit structure of the mechanically stirred, low-temperature anaerobic giant underground reactor of this utility model.

[0025] Figure 3This is a first cross-sectional view of the mechanically stirred, low-temperature anaerobic giant underground reaction tank of this utility model;

[0026] Figure 4 This is a second cross-sectional view of the mechanically stirred, low-temperature anaerobic giant underground reaction tank of this utility model;

[0027] Figure 5 This is the third cross-sectional view of the mechanically stirred, low-temperature anaerobic giant underground reaction tank of this utility model;

[0028] In the above diagrams: 1. Bottom of the pool; 2. Dam; 3. Geotextile membrane; 4. Rotary pump; 5. Material circulation pipe; 6. Biogas collection main pipe; 7. Biogas collection branch pipe; 8. Roots blower; 9. Bypass pipe; 10. Main material pipeline; 11. Supernatant discharge pipe; 12. Discharge pipe; 13. Feed pipe; 14. Centrifugal pump; 15. Solenoid valve; 16. Discharge valve; 17. Discharge pipe; 18. Biogas output pipe; 19. Biogas output valve; 20. First main pipeline valve; 21. Second main pipeline valve; 22. Third main pipeline valve; 23. Fourth main pipeline valve; 24. Fifth main pipeline valve; 25. Material circulation valve. Detailed Implementation

[0029] To better understand this utility model, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0030] Example: Figure 1 , Figure 2 As shown, a mechanically stirred, low-temperature anaerobic giant underground reactor includes a reactor, a material distribution unit, and a biogas collection unit. This mechanically stirred, low-temperature anaerobic giant underground reactor integrates storage and deep fermentation degradation.

[0031] The reaction tank is underground, with a depth of approximately 7-8 meters. A geomembrane 3 (HDPE) is laid on the bottom 1 and the dam 2 of the reaction tank to prevent the fermentation raw materials from seeping into the soil and polluting the groundwater. Similarly, a geomembrane 3 (HDPE) is laid on the top of the tank to prevent surface water from seeping into the reaction tank and to collect the biogas produced during fermentation.

[0032] The material distribution unit includes a main material pipeline 10 arranged on and around the dam 2 in a U-shape, forming a single, interconnected structure. Multiple discharge pipes 12 are connected to the main material pipeline 10, distributed within the reaction tank. Each discharge pipe 12 is equipped with a solenoid valve 15, which can be controlled by an external control system to change the on / off state of each discharge pipe 12. Figure 3As shown, the discharge pipe 12 extends downward from above the dam 2, with its lower end located at the bottom 1 of the reaction tank. A feed pipe 13 is connected to one side of the main material pipeline 10. A first main pipeline valve 20 and a second main pipeline valve 21 are installed on both sides of the feed pipe 13 on the main material pipeline 10. A discharge pipe 17 is connected to the other side of the main material pipeline 10. A third main pipeline valve 22 and a fourth main pipeline valve 23 are installed on both sides of the discharge pipe 17 on the main material pipeline 10. A centrifugal pump 14 is installed on the feed pipe 13, and a rotor pump 4 and a discharge valve 16 are installed on the discharge pipe 17. A material circulation pipe 5 is also connected between the discharge pipe 17 and the main material pipeline 10. A material circulation valve 25 is installed on the material circulation pipe 5, and a fifth main pipeline valve 24 is installed on the right side of the material circulation pipe 5 on the main material pipeline 10.

[0033] After solid-liquid separation of manure (pig manure, cow manure, etc.) by screw extrusion, the liquid phase is discharged into the main material pipeline 10 via the feed pipe 13 by the centrifugal pump 14, and then discharged into the reaction tank for storage and fermentation through various pipelines. To prevent sludge settling during fermentation, the material can be circulated in the reaction tank by the rotor pump 4 and the material circulation pipe 5, in conjunction with the solenoid valves on the main material pipeline 10 and each discharge pipe. For example, by opening the fourth main pipeline valve 23 and the material circulation valve 25 on the material circulation pipe 5, and closing the discharge valve 16, the first main pipeline valve 20, the third main pipeline valve 22, and the fifth main pipeline valve 24, the material on the right side of the bottom 1 of the tank will be drawn into the right side of the main material pipeline 10 through the discharge pipe 12 between the first main pipeline valve 20 and the fourth main pipeline valve 23, under the action of the rotor pump 4. Then, it will be pumped into the left side of the main material pipeline 10 through the material circulation pipe 5, and then transported back to the bottom 1 of the tank through the discharge pipe between the first main pipeline valve 20 and the fifth main pipeline valve 24, forming a large-scale circulation system that simultaneously draws in and discharges, ensuring the continuous and efficient fermentation process. The material circulation position can be alternated by opening and closing the valves, ultimately achieving full-area circulation and stirring. After fermentation is complete, the material circulation valve 25 on the material circulation pipe 5 is closed, and the discharge valve 16 is opened. The rotor pump 4 is activated, and the material in the reaction tank can be discharged through the discharge pipe 17, achieving discharge. The discharge position in the reaction tank can be controlled by opening the solenoid valve of the corresponding area.

[0034] To facilitate the discharge of supernatant from the reaction tank, multiple supernatant drain pipes 11 are connected to the main material pipeline 10, and each supernatant drain pipe 11 is equipped with a solenoid valve 15. Figure 4As shown, the lower end of the supernatant drain pipe 11 extends to the middle of the reaction tank. Different supernatant drain pipes 11 have different lengths, different insertion depths into the reaction tank, and different positions within the reaction tank. Supernatant drain pipes 11 at different depths and positions facilitate the discharge of biogas slurry from different depths and areas. The discharged biogas slurry can be used in nearby farmland irrigation systems for irrigating crops, or it can be transported to the pretreatment workshop for use in the mixing tank for raw material preparation, thus saving on tap water consumption.

[0035] like Figure 2 , Figure 5 As shown, the biogas collection unit includes a main biogas collection pipe 6 arranged around the top of the reaction tank. The main biogas collection pipe 6 is arranged in a U-shape and is connected as a whole. The main biogas collection pipe 6 is connected to multiple biogas collection branch pipes 7, and each biogas collection branch pipe 7 is equipped with a solenoid valve 15. The multiple biogas collection branch pipes 7 are distributed on the top of the reaction tank, which can collect biogas located on the top of the reaction tank from various directions.

[0036] A biogas collection main pipe 6 is connected to a biogas output pipe 18 on one side. A Roots blower 8 and a biogas output valve 19 are connected to the biogas output pipe 18. When the Roots blower 8 is running, biogas enters the biogas collection main pipe 6 through each biogas collection branch pipe 7, and is then transported to the biogas purification and utilization system through the biogas output pipe 18.

[0037] The biogas collection main pipe 6 is also connected to bypass pipes 9 located on both sides of the Roots blower 8. Both bypass pipes 9 are connected to the biogas output pipe 18 at the position between the Roots blower 8 and the biogas output valve 19. When biogas is not being supplied externally, the biogas output valve 19 is closed, and biogas can be reversed through the bypass pipes 9 and blown out through the biogas collection branch pipes 7, thereby cleaning the biogas collection main pipe 6 and the biogas collection branch pipes 7 and preventing condensate from freezing and clogging the pipes.

[0038] This novel, mechanically stirred, low-temperature anaerobic giant underground reactor utilizes pumps and pipelines to achieve biogas slurry flow, forming a material circulation system that simultaneously draws in and releases wastewater. This prevents sludge deposition within the reactor and ensures long-term stable operation. The biogas collection unit is equipped with a backflushing mechanism to clean the main biogas collection pipe 6 and branch pipes 7, preventing condensate from freezing and clogging the pipes. This mechanically stirred, low-temperature anaerobic giant underground reactor features a sunken structure, utilizing waste heat from materials and geothermal energy to improve overall energy efficiency. With a volume exceeding 20,000 cubic meters, it also functions as a long-term biogas fertilizer storage facility, adapting to the seasonal needs of agricultural production.

[0039] This utility model of a non-mechanically stirred, low-temperature anaerobic giant underground reactor has low construction cost and integrates functions such as anaerobic reaction, biogas collection, and material mixing and circulation, making it suitable for application in farms across various regions.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present invention.

Claims

1. A non-mechanically stirred, low-temperature anaerobic giant underground reaction tank, characterized in that: It includes a reaction tank, a material distribution unit, and a biogas collection unit. The bottom, dam, and top of the reaction tank are all covered with geomembranes to prevent seepage. The material distribution unit includes a main material pipeline arranged around the dam, with multiple discharge pipes connected to the main material pipeline. A feed pipe is connected to one side of the main material pipeline, and a discharge pipe is connected to the other side of the main material pipeline. A centrifugal pump is installed on the feed pipe, and a rotor pump is installed on the discharge pipe. A material circulation pipe is also connected between the discharge pipe and the main material pipeline. The biogas collection unit includes a biogas collection main pipe arranged around the top of the reaction tank and biogas collection branch pipes connected to the biogas collection main pipe. A biogas output pipe is connected to one side of the biogas collection main pipe. A Roots blower and a biogas output valve are connected to the biogas output pipe. Bypass pipes located on both sides of the Roots blower are also connected to the biogas collection main pipe. The bypass pipes are all connected to the biogas output pipe at the position between the Roots blower and the biogas output valve.

2. The mechanically stirred, low-temperature anaerobic giant underground reactor according to claim 1, characterized in that: The discharge pipe extends downwards to the bottom of the reaction tank.

3. The mechanically agitatorless cryogenic anaerobic mega underground reaction vault of claim 1, wherein: The multiple discharge pipes are distributed inside the reaction tank.

4. The mechanically agitatorless cryogenic anaerobic mega underground reaction vault of claim 1, wherein: The biogas collection branch pipes are multiple and distributed at the top of the reaction tank.

5. The mechanically agitatorless cryogenic anaerobic mega underground reaction vault of claim 1, wherein: Both the discharge pipe and the biogas collection branch pipe are equipped with solenoid valves.

6. The mechanically stirred, low-temperature anaerobic giant underground reactor according to claim 1, characterized in that: The main material pipeline is equipped with multiple supernatant drain pipes.

7. The mechanically stirred, low-temperature anaerobic giant underground reaction tank according to claim 6, characterized in that: The lower ends of the different supernatant drain pipes extend to different depths in the middle of the reaction tank.

8. The mechanically stirred, low-temperature anaerobic giant underground reaction tank according to claim 7, characterized in that: A solenoid valve is installed on the supernatant drain pipe.

9. The mechanically stirred, low-temperature anaerobic giant underground reaction tank according to claim 7, characterized in that: The depth of the reaction tank is 7-8 meters.

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