High-efficiency high-solid-content biogas preparation device

Abstract

The utility model relates to an efficient high-solid-content biogas preparation device, and belongs to the technical field of biogas production, the efficient high-solid-content biogas preparation device comprises an outer-layer tank body and an inner-layer tank body, the inner-layer tank body is located in the outer-layer tank body, and the inner-layer tank body is communicated with the outer-layer tank body through a top opening; a stirring device and a discharging pipeline are arranged at the top of the outer-layer tank body, a liquid outlet pipeline communicated with the discharging pipeline is arranged in the outer-layer tank body, and the stirring device is communicated with the discharging pipeline and the liquid outlet pipeline; and a slag discharging pipeline communicated with the outside is arranged in the inner-layer tank body. According to the high-efficiency high-solid-content biogas preparation device provided by the utility model, a liquid circulation structure of the inner tank body and the outer tank body is designed, so that the retention time of biomass in the outer tank body is prolonged, the sufficient fermentation of the biomass is ensured, and the fermentation efficiency is improved; the stirring device is communicated with the blanking pipeline and the liquid outlet pipeline, so that uniform mixing of the biogas slurry and the biomass is ensured, and meanwhile, high solid content (gt; 50%), so that the mass of biomass in the fermentation tank is enough, and the ratio of daily gas production to the volume of the tank body is (5: 1)-(10: 1).

Description

Technical Field

[0001] The present application relates to the technical field of biogas production, and in particular to a high-efficiency and high-solid content biogas production device. Background Art

[0002] Biogas production is a technology that converts organic waste into biogas through anaerobic fermentation. As a green, low-carbon, and renewable energy source, biogas production is widely used in agricultural waste management, garbage disposal, and sewage treatment. However, existing biogas production equipment and technologies face several practical challenges, particularly when biomass residence time is too short and the solids content of biogas slurry in single-layer tanks is low, which seriously affects fermentation efficiency and gas production.

[0003] In the existing technology, most fermenters adopt a single-layer tank design, and the ratio of the fermenter volume to the daily gas production is usually 1:1, which means that the production capacity of the fermenter fails to reach optimal efficiency. In the single-layer tank design, the volume of liquid during the biogas fermentation process is usually large. In order to ensure a good fermentation environment, the liquid in the fermenter needs to maintain a certain fluidity and volume, which means that the water content in the biogas slurry is relatively high. Therefore, the proportion of solid matter in the tank body is relatively small, resulting in a low overall solid content. The low solid content of the biogas slurry results in relatively sparse contact and treatment of the biomass by microorganisms during the fermentation reaction, thereby affecting the fermentation efficiency. In addition, under the traditional single-layer tank design, the accumulation of biogas residues may lead to localized accumulation of biomass, hindering the continued fermentation of fresh biomass and further reducing the production of biogas. Therefore, how to increase the solid content of the biogas slurry and ensure that the fresh biomass can be fully mixed with the biogas slurry is a key problem in current biogas fermentation technology. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the present application provides a high-efficiency and high-solid content biogas production device, which adopts the following technical solutions:

[0005] A high-efficiency and high-solid content biogas production device includes an outer tank body and an inner tank body, the inner tank body is located inside the outer tank body and is connected to the outer tank body through a top opening; a feed pipe is provided on the top of the outer tank body, a liquid discharge pipe is provided inside the outer tank, and the feed pipe and the liquid discharge pipe are connected through a stirring device; a slag discharge pipe connected to the outside is provided in the inner tank body.

[0006] By adopting the above technical solution, the device is provided with a slag discharge pipe, so that the fermented biogas residue can be regularly discharged from the bottom of the inner tank body through the slag discharge pipe, thereby preventing excessive accumulation of biogas residue in the tank body, ensuring smooth flow of liquid in the fermentation tank, and further improving the fermentation efficiency of biomass; at the same time, the inner tank body is located inside the outer tank body, and is connected to the outer tank body through the top opening, forming a liquid circulation structure of the inner and outer tank bodies; with the discharge of biogas residue at the bottom of the inner tank body, the biogas liquid in the outer tank body slowly descends, prolonging the residence time of the biomass in the outer tank body and ensuring sufficient fermentation; the device is also equipped with a stirring device, which connects the feed pipe and the liquid discharge pipe so that the biogas liquid extracted from the bottom of the outer tank body is mixed with the fresh After the biomass is fully mixed externally, it is re-added to the tank from the top of the outer tank through the discharge pipe. The stirring device ensures that the biogas slurry and biomass are evenly mixed before entering the fermentation tank and maintains a high solid content (>50%), so that the biomass mass in the fermentation tank is sufficient, thereby achieving a daily gas production and tank volume ratio of 5:1 to 10:1; it solves the problem of uneven mixing inside the fermentation tank, improves the solid content during the fermentation process, and thus increases the fermentation efficiency and biogas production; the liquid circulation design of the inner and outer tanks combined with the function of the stirring device effectively prolongs the residence time of the biomass in the outer tank, allowing the biomass to fully contact with the microorganisms, achieving efficient fermentation and high-solid content biogas production.

[0007] Preferably, the stirring device includes a stirring tank with an opening at the top, the outlet of the liquid outlet pipe is located above the stirring tank, and the liquid in the liquid outlet pipe flows directly into the stirring tank; a stirring mechanism is provided in the stirring tank; and the bottom of the stirring tank is connected to the discharge pipe.

[0008] Preferably, the stirring mechanism includes a stirring shaft rotatably connected to the stirring tank, stirring blades are evenly distributed on the outer wall of the stirring shaft, and a motor for driving the stirring shaft to rotate is fixedly installed on the outer wall of the stirring tank.

[0009] By adopting the above technical solution, biogas liquid is extracted from the bottom of the outer tank body, transported to the stirring tank through the liquid outlet pipe to be mixed with fresh biomass, and the mixing of the biogas liquid and the newly added biomass is achieved by the rotation of the stirring shaft. After mixing, the biogas liquid is re-added to the tank body from the top of the outer tank body through the discharge pipe to ensure that the biomass and biogas liquid are mixed evenly. The newly added biomass is stirred outside the fermentation tank, solving the problem of difficult uniform mixing when the solid content is high.

[0010] Preferably, the number of the feed pipes is 2 to 4, the feed pipes correspond to the stirring devices one by one, and each feed pipe is connected to 1 to 3 liquid outlet pipes.

[0011] Preferably, the top of the outer tank body is connected with a transition pipe and an air outlet pipe, the diameter of the transition pipe is 1.0 to 1.3 m, and the height is 1.0 to 1.3 m; the diameter of the air outlet pipe is 0.1 to 0.15 m.

[0012] By adopting the above technical solution and setting up a transition pipe, the problem that when fresh biomass is added for fermentation, the biogas liquid level rises and the gas outlet pipe is easily blocked when the biogas bubbles burst is solved.

[0013] Preferably, the top opening of the inner tank body is 0.8 to 1.2 m away from the top of the outer tank body.

[0014] Preferably, the lower end of the slag discharge pipe is 0.5 to 1.0 m away from the bottom of the inner tank body.

[0015] Preferably, the lower end of the liquid outlet pipe is 0.5 to 1.0 m away from the bottom of the outer tank body.

[0016] Preferably, the top of the outer tank body is configured to be arched.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The utility model provides a high-efficiency and high-solid content biogas production device, which is designed with a liquid circulation structure of inner and outer tanks. The inner tank is located inside the outer tank and is connected to the outer tank through a top opening. As the biogas residue at the bottom of the inner tank is slowly discharged, the biogas liquid in the outer tank slowly descends, extending the residence time of the biomass in the outer tank, ensuring the full fermentation of the biomass and improving the fermentation efficiency. The device is equipped with a stirring device that connects the feed pipe and the liquid outlet pipe. The biogas liquid extracted from the bottom of the outer tank is fully mixed with the fresh biomass outside and then re-added to the tank from the top of the outer tank. The stirring device ensures uniform mixing of the biogas liquid and the biomass while maintaining a high solid content (>50%), so that the mass of biomass in the fermentation tank is sufficient, thereby achieving a daily gas production and tank volume ratio of 5:1 to 10:1.

[0019] 2. A transition pipe is provided on the top of the outer tank, which effectively solves the problem of rising biogas liquid level caused by the addition of fresh biomass and the problem of easy blockage of the gas outlet pipe when biogas bubbles burst, thereby ensuring the stable operation of the system.

[0020] 3. The stirring tank in the stirring device is connected to the liquid outlet pipe and the discharge pipe to mix the fresh biomass and the biogas slurry outside the fermentation tank. The stirring mechanism (including the stirring shaft and stirring blades) in the stirring tank is driven by a motor to achieve sufficient and uniform mixing. It is especially suitable for working conditions with high solid content. The configuration of multiple discharge pipes improves the mixing efficiency. Each discharge pipe corresponds to a stirring device to ensure that the mixed biomass can be evenly distributed in the fermentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency and high-solid content biogas production device of the present application.

[0022] Explanation of the accompanying symbols: 1. Outer tank body; 2. Inner tank body; 3. Liquid outlet pipe; 4. Stirring device; 41. Stirring tank; 42. Stirring mechanism; 5. Feeding pipe; 6. Transition pipe; 7. Air outlet pipe; 8. Slag discharge pipe. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 This application is described in further detail.

[0024] The present application discloses a schematic diagram of the overall structure of a high-efficiency and high-solid content biogas production device.

[0025] Reference Figure 1 A high-efficiency, high-solids biogas production device includes an outer tank 1 and an inner tank 2. The inner tank 2 is located within the outer tank 1 and communicates with the outer tank 1 through a top opening. The top of the outer tank 1 is configured in an arched shape. The distance between the top opening of the inner tank 2 and the top of the outer tank 1 is 1 meter. A slag discharge pipe 8 is provided within the inner tank 2. The lower end of the slag discharge pipe 8 is 0.8 meters from the bottom of the inner tank 2. It is used to regularly discharge biogas slag from the bottom of the inner tank 2 to prevent excessive accumulation inside the tank that affects the fermentation process.

[0026] Four liquid outlet pipes 3 are provided in the outer tank body 1. The lower end of the liquid outlet pipe 3 is 0.8m away from the bottom of the outer tank body 1. Two feed pipes 5 and two sets of stirring devices 4 are provided on the top of the outer tank body 1. In this embodiment, one feed pipe 5 corresponds to one stirring device 4 and two liquid outlet pipes 3. The stirring device 4 is composed of a stirring tank 41 and a stirring mechanism 42. The bottom of the stirring tank 41 is connected to the feed pipe 5, and the top opening faces upward. The biogas slurry at the bottom of the outer tank body 1 is transported to the stirring tank 41 through the liquid outlet pipe 3 and mixed with fresh biomass in the stirring tank 41. The stirring mechanism 42 includes a stirring shaft provided in the stirring tank 41. The outer wall of the stirring shaft is evenly distributed with stirring blades, and the stirring shaft is driven to rotate by a motor, thereby achieving sufficient mixing of the biogas slurry and the newly added biomass. A transition pipe 6 and an air outlet pipe 7 are provided on the top of the outer tank body 1. The diameter of the transition pipe 6 is 1.2 meters and the height is 1.2 meters; the diameter of the air outlet pipe 7 is 0.12 meters. The transition pipe 6 prevents the problem of clogging the air outlet pipe 7 due to rising biogas liquid level and bursting of biogas bubbles when fresh biomass is added for fermentation.

[0027] Working principle:

[0028] 1. Material mixing: First, set the volume of the fermentation device to 2000m 2. When the device is working, the biogas slurry at the bottom of the outer tank body 1 is pumped into the stirring tank 41 through the liquid outlet pipe 3 (this application does not protect the specific pumping drive mechanism, and the pneumatic discharging method of pumping air from the outer tank body in the prior art can be used to pump the biogas slurry from the bottom of the outer tank body into the stirring tank 41), and fresh biomass is added to the stirring tank 41 according to 3% to 7% of the mass of the biogas slurry. The stirring shaft driven by the motor in the stirring tank 41 rotates to fully mix the biogas slurry and the fresh biomass. The feeding cycle is 20 to 30 times a day, and 20 to 30 tons of dry biomass are added to the fermentation tank. The stirred mixture re-enters the top of the outer tank body 1 through the feeding pipe 5, ensuring the uniform mixing of the biomass and the biogas slurry and maintaining the material characteristics of high solid content.

[0029] Fermentation and slag discharge: After the mixed material enters the tank body, anaerobic fermentation is carried out in the tank body. As the fermentation progresses, the biogas residue at the bottom of the inner tank body 2 gradually accumulates. The biogas residue is slowly discharged through the slag discharge pipe 8 (this application does not protect the specific pumping drive mechanism, and the pneumatic discharging method of pumping air from the inner tank body in the prior art can be used to achieve the extraction of biogas residue from the bottom of the inner tank body). Every day, 30 to 40 tons of biogas residue are extracted from the inner tank body through the inner layer discharging device. After the biogas residue is dehydrated, the generated biogas liquid is added to the fermentation tank again.

[0030] Circulation structure: Because the inner tank 2 is connected to the outer tank 1 through the top opening, a liquid circulation structure is formed. As the biogas residue at the bottom of the inner tank 2 is discharged, the biogas liquid in the outer tank 1 slowly drops. This liquid level difference prolongs the residence time of the biomass in the outer tank 1, thereby ensuring sufficient fermentation of the biomass and increasing biogas production.

[0031] Biogas Emission: Biogas generated during the fermentation process is discharged through the outlet pipe 7 at the top of the outer tank 1, avoiding the danger of excessive pressure. At the same time, the design of the transition pipe 6 effectively prevents the outlet pipe 7 from being blocked by rising liquid levels or bursting biogas bubbles.

[0032] Continuous and efficient fermentation: The liquid circulation design and the stirring device 4 work together to ensure sufficient contact between biomass and microorganisms, making the fermentation process efficient and stable. 10,000 to 15,000 cubic meters of biogas can be obtained daily.

Claims

1. A high-efficiency and high-solid content biogas production device, characterized by: The invention comprises an outer tank body (1) and an inner tank body (2), wherein the inner tank body (2) is located inside the outer tank body (1) and is connected to the outer tank body (1) through a top opening; a material discharge pipe (5) is provided at the top of the outer tank body (1), a liquid discharge pipe (3) is provided inside the outer tank body (1), and the material discharge pipe (5) and the liquid discharge pipe (3) are connected through a stirring device (4); and a slag discharge pipe (8) connected to the outside is provided inside the inner tank body (2).

2. The high-efficiency and high-solid content biogas production device according to claim 1 is characterized in that: The stirring device (4) comprises a stirring tank (41), the top of the stirring tank (41) is open, the outlet of the liquid outlet pipe (3) is located above the stirring tank (41), and the liquid in the liquid outlet pipe (3) directly flows into the stirring tank (41); a stirring mechanism (42) is provided in the stirring tank (41); and the bottom of the stirring tank (41) is connected to the discharge pipe (5).

3. The high-efficiency and high-solid content biogas production device according to claim 2 is characterized in that: The stirring mechanism (42) comprises a stirring shaft rotatably connected to the stirring tank (41), stirring blades are evenly distributed on the outer wall of the stirring shaft, and a motor for driving the stirring shaft to rotate is fixed on the outer wall of the stirring tank (41).

4. The high-efficiency and high-solid content biogas production device according to claim 1 is characterized in that: The number of the feed pipes (5) is 2 to 4, the feed pipes (5) correspond to the stirring devices (4) one by one, and each feed pipe (5) is connected to 1 to 3 liquid outlet pipes (3).

5. The high-efficiency and high-solid content biogas production device according to claim 1 is characterized in that: The top of the outer tank body (1) is connected with a transition pipe (6) and an air outlet pipe (7); the diameter of the transition pipe (6) is 1.0 to 1.3 m and the height is 1.0 to 1.3 m; the diameter of the air outlet pipe (7) is 0.1 to 0.15 m.

6. The high-efficiency and high-solid content biogas production device according to claim 1, characterized in that: The top opening of the inner tank body (2) is 0.8 to 1.2 meters away from the top of the outer tank body (1).

7. The high-efficiency and high-solid content biogas production device according to claim 1, characterized in that: The lower end of the slag discharge pipe (8) is 0.5 to 1.0 m away from the bottom of the inner tank body (2).

8. The high-efficiency and high-solid content biogas production device according to claim 1, characterized in that: The lower end of the liquid outlet pipe (3) is 0.5 to 1.0 m away from the bottom of the outer tank body (1).

9. The high-efficiency and high-solid content biogas production device according to claim 1, characterized in that: The top of the outer tank body (1) is arranged in an arch shape.

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