Biogas anaerobic fermentation tank
By setting up a multi-layer insulation structure on the outside of the biogas anaerobic digester, the problem of poor insulation effect in cold northern regions is solved, achieving low-cost and high-efficiency insulation.
Patent Information
- Application Number
- CN202320723352.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-04
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2033-04-04
AI Technical Summary
Existing biogas anaerobic digesters have poor insulation in cold northern regions, making it difficult to maintain fermentation temperatures and increasing production and construction costs.
The tank adopts a multi-layer insulation structure, including a polyurethane foam layer on the outside of the tank, a hollow structure layer, and a sheath insulation layer. Polystyrene foam layers are set on the top and outside to form a heat insulation buffer layer. An insulation base is used at the bottom of the tank to improve the insulation effect.
It achieves effective temperature maintenance in cold environments, reduces production and construction costs, and improves thermal insulation performance.
Smart Images
Figure CN223793146U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a biogas anaerobic fermentation tank. Background Technology
[0002] In the cold northern regions, biogas production and operation are affected by the climate, which restricts the development of biogas in the north. Biogas is difficult to survive the winter in the cold northern regions. Biogas anaerobic fermentation and low-temperature fermentation processes require a temperature of 35 degrees Celsius inside the fermentation tank, while the outdoor temperature in the north can reach more than -30 degrees Celsius in winter. There is a temperature difference of more than 60 degrees Celsius between the fermentation temperature and the outdoor temperature. Existing technologies make it difficult to solve the problem of constant temperature in biogas fermentation tanks.
[0003] Existing biogas digesters mainly include: indoor anaerobic digesters, underground or semi-underground reinforced concrete digesters, carbon steel digesters, and coil-type heated digesters. However, the applicant has found that all existing technologies suffer from varying degrees of technical problems, such as high production or construction costs and poor insulation. Utility Model Content
[0004] The purpose of this invention is to provide a biogas anaerobic fermentation tank to solve the technical problem of poor heat preservation in the prior art.
[0005] To solve the above problems, the biogas anaerobic digester involved in this utility model adopts the following technical solution:
[0006] This utility model provides a biogas anaerobic digester, including a tank body. A first polyurethane foam layer is provided on the outer periphery of the tank body. A sheath insulation layer is fitted onto the outer periphery of the tank body. A gap is provided between the sheath insulation layer and the first polyurethane foam layer to form a hollow layer. A polystyrene foam layer is provided on the outer wall of the sheath insulation layer. A sealing plate is provided at the top of the hollow layer to seal its top. The two ends of the sealing plate are respectively fixed to the top surface of the sheath insulation layer and the top surface of the digester. A second polyurethane foam layer is provided on the sealing plate and the outer side of the top wall of the tank body.
[0007] Preferably, it also includes an insulation base, on which the tank body is mounted, and the sheath insulation layer is connected to the insulation base.
[0008] Preferably, the tank is a carbon steel fermentation tank or an enamel-lined assembled fermentation tank.
[0009] Preferably, the sealing plate is made of steel plate.
[0010] Preferably, the tank is configured as a semi-underground fermentation tank, and the sheath insulation layer includes a first sheath shell located underground and a second sheath shell located above ground. The second sheath shell is located above the first sheath shell. The first sheath shell is configured as a reinforced concrete structure, and the second sheath shell is configured as a brick-concrete structure.
[0011] Preferably, the tank body is configured as an underground fermentation tank, and the sheath insulation layer is configured as a reinforced concrete structure; alternatively, the tank body is configured as an above-ground fermentation tank, and the sheath insulation layer is configured as a brick-concrete structure.
[0012] The beneficial effects of this utility model are as follows:
[0013] This utility model provides a biogas anaerobic digester, including a tank body. Compared with the prior art, the outer layer of the tank body, from the inside out, is provided with a polyurethane foam layer, a hollow structure layer, and a sheath insulation layer. These three layers work together to create a cold-insulating buffer layer between the tank body and the outside environment, avoiding direct contact between the tank body and the outside environment and reducing the temperature difference between the tank body and the external environment. Simultaneously, a steel plate and a polystyrene foam layer are provided on the upper side of the tank body to achieve upper cold-insulating buffer. This device has low cost and good heat insulation and cold-insulating effect. Attached Figure Description
[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below:
[0015] Figure 1 A schematic diagram of a specific embodiment of a biogas anaerobic digester;
[0016] Figure 2 for Figure 1 Top view after removing the cover plate.
[0017] Explanation of reference numerals in the attached drawings: 1. Tank body; 2. Base; 3. First polyurethane foam layer; 4. Sheath insulation layer; 5. Hollow layer; 6. Polystyrene foam layer; 7. Second polyurethane foam layer; 8. Sealing plate. Detailed Implementation
[0018] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0019] This utility model provides a multifunctional anaerobic digester for biogas, such as... Figure 1-2 As shown, the device includes a tank 1, which is placed on a base 2. The base 2 is a reinforced concrete structure used for heat insulation and cold insulation of the bottom of the tank 1. A first polyurethane foam layer 3 is provided on the outer peripheral wall of the tank 1, and a sheath insulation layer 4 is provided on the outer side of the outer peripheral wall of the tank 1. A gap is left between the sheath insulation layer 4 and the first polyurethane foam layer 3. This gap constitutes the hollow structure (hollow layer 5) of the device. A polystyrene foam layer 6 is provided on the outer wall of the sheath insulation layer 4, and the sheath insulation layer 4 is connected to the insulation base.
[0020] The top surface of the sheath insulation layer 4 is at the same height as the top surface of the peripheral wall of the tank 1. A sealing plate 8 is provided on the hollow layer 5 to seal its upper end. The two ends of the sealing plate 8 are fixed to the top surface of the sheath insulation layer 4 and the top surface of the fermentation tank, respectively. A second polyurethane foam layer 7 is provided above the sealing plate 8 and on the outer side of the top wall of the tank 1 (the part not covered by the sealing plate 8).
[0021] Both the second polyurethane foam layer 7 and the first polyurethane foam layer 3 are polyurethane foam, the sealing plate 8 is made of steel plate, and the tank body 1 is made of carbon steel fermentation tank or enamel assembled fermentation tank.
[0022] When tank 1 is configured as a semi-underground fermentation tank, the sheath insulation layer 4 includes a first sheath shell located underground and a second sheath shell located above ground. The second sheath shell is situated above the first sheath shell. The first sheath shell is constructed of reinforced concrete, and the second sheath shell is constructed of brick and concrete. When tank 1 is configured as an underground fermentation tank, the sheath insulation layer 4 is constructed of reinforced concrete; when tank 1 is configured as an aboveground fermentation tank, the sheath insulation layer 4 is constructed of brick and concrete.
[0023] Under actual working conditions, the exterior of the tank 1 is coated with 100mm thick polyurethane foam insulation. A sheath insulation layer 4 is installed at a distance of 1.5 to 2 meters from the radius of the tank 1. An 80mm thick polystyrene foam board is bonded to the exterior of the sheath insulation layer 4. The height of the sheath is consistent with the tank wall of the tank 1. The exterior of the steel plate is coated with 150mm thick polyurethane foam insulation.
[0024] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.
Claims
1. A biogas anaerobic digester, comprising a tank body, characterized in that, The outer periphery of the tank is provided with a first polyurethane foam layer, and a sheath insulation layer is provided on the outer periphery of the tank. A gap is provided between the sheath insulation layer and the first polyurethane foam layer to form a hollow layer. The outer wall of the sheath insulation layer is provided with a polystyrene foam layer. A sealing plate is provided at the top of the hollow layer to seal its top. The two ends of the sealing plate are fixed to the top surface of the sheath insulation layer and the top surface of the tank, respectively. A second polyurethane foam layer is provided on the outer periphery of the sealing plate and the top wall of the tank.
2. The anaerobic digester for biogas according to claim 1, characterized in that, It also includes an insulation base, on which the tank body is installed, and the sheath insulation layer is connected to the insulation base.
3. The anaerobic digester for biogas according to claim 2, characterized in that, The tank is configured as a carbon steel fermentation tank or an enamel-lined assembled fermentation tank.
4. The anaerobic digester for biogas according to claim 3, characterized in that, The sealing plate is made of steel plate.
5. A biogas anaerobic digester according to any one of claims 1-4, characterized in that, The tank is designed as a semi-underground fermentation tank. The sheath insulation layer includes a first sheath shell located underground and a second sheath shell located above ground. The second sheath shell is located above the first sheath shell. The first sheath shell is a reinforced concrete structure, and the second sheath shell is a brick-concrete structure.
6. A biogas anaerobic digester according to any one of claims 1-4, characterized in that, The tank body is set as an underground fermentation tank, and the sheath insulation layer is set as a reinforced concrete structure; or, the tank body is set as an above-ground fermentation tank, and the sheath insulation layer is set as a brick-concrete structure.