Split type biogas digester

Abstract

The invention relates to the technical field of biomass energy utilization equipment, in particular to a split type biogas digester which comprises a digester body, a gas storage tank and a biogas slurry tank, the gas storage tank is arranged on the left side of the digester body, the biogas slurry tank is arranged on the right side of the digester body, a gas conveying pipe is communicated between the digester body and the gas storage tank, and the gas conveying pipe is communicated with the biogas slurry tank. According to the invention, a split design of'pool body-gas storage tank-biogas slurry tank 'is adopted, physical isolation of fermentation, gas storage and liquid storage is realized, mutual interference of functions is avoided, biogas purity and storage safety are improved, independent collection and utilization of biogas slurry and biogas residue are facilitated, and the biogas slurry and biogas residue can be recycled. The stirring devices driven by a plurality of motors realize uniform mixing of materials, so that the microbial reaction efficiency is improved; the underground heating furnace ensures that the fermentation temperature is stabilized in a suitable interval and is not influenced by the environment temperature, the annual gas production stability is improved, and the problem of difficult gas production in a low-temperature environment is solved.

Description

Technical Field

[0001] This invention relates to the field of biomass energy utilization equipment technology, specifically a split-type biogas digester. Background Technology

[0002] Biogas digesters, as core equipment for converting organic waste into clean energy (biogas) and organic fertilizer (biogas slurry and biogas residue), play a vital role in rural energy transition and the development of ecological agriculture. However, existing biogas digesters suffer from significant technical limitations that restrict their widespread application.

[0003] Integrated structure, mutual interference of functions: Traditional biogas digesters are mostly integrated structures of "fermentation-gas storage-liquid storage". The biogas produced during the fermentation process is mixed with biogas liquid and biogas residue for storage, which not only affects the purity of biogas and collection efficiency, but also makes it difficult to clean and discharge biogas liquid and biogas residue, and easily causes the digester to be blocked.

[0004] Low fermentation efficiency and unstable gas production: The organic materials are not mixed evenly in the tank and there is a lack of efficient stirring devices, resulting in insufficient contact between microorganisms and materials; moreover, the fermentation temperature is greatly affected by the environment, and the fermentation rate drops significantly under low temperature conditions, resulting in poor gas production stability throughout the year.

[0005] Difficulty in separating sludge and liquid, resulting in low resource utilization rate: When the fermented biogas slurry and biogas residue are not effectively separated, direct discharge or use can easily clog pipes, and the lack of graded utilization leads to resource waste, which does not meet the circular utilization requirements of ecological agriculture.

[0006] The maintenance and operation are complicated: the cleaning and maintenance of integrated biogas digesters require shutdown and venting, which is difficult to operate, labor-intensive, and poses safety hazards. Ordinary farmers cannot complete the maintenance independently. Therefore, a split-type biogas digester is proposed. Summary of the Invention

[0007] In view of this, the present invention provides a split-type biogas digester to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0008] The technical solution of the present invention is implemented as follows: a split biogas digester includes a digester body, a gas storage tank, and a biogas slurry tank. The gas storage tank is located on the left side of the digester body, and the biogas slurry tank is located on the right side of the digester body. A gas supply pipe connects the digester body and the gas storage tank. A discharge pipe is connected to one side of the digester body. One end of the discharge pipe is connected to a sludge-liquid separator. The liquid outlet of the sludge-liquid separator is connected to a liquid supply pipe. One end of the liquid supply pipe is connected to the biogas slurry tank.

[0009] More preferably, an underground heating furnace is installed at the bottom of the pool.

[0010] More preferably, one end of the slag-liquid separator is connected to a slag outlet pipe.

[0011] More preferably, multiple motors are evenly installed on the top of the pool, and a stirring rod is fixedly connected to the output end of the motor. Multiple stirring blades are evenly fixedly connected to the outer wall of the stirring rod.

[0012] More preferably, a feed inlet is provided on one side of the pool.

[0013] Preferably, the discharge pipe, liquid delivery pipe, and slag discharge pipe are each equipped with an independent valve for controlling material conveying.

[0014] More preferably, the gas storage tank is equipped with a pressure gauge and a safety valve to monitor the gas pressure inside the tank and to release pressure in case of overpressure.

[0015] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions:

[0016] I. This invention adopts a separate design of "pool body - gas storage tank - biogas slurry tank" to achieve physical isolation of fermentation, gas storage and liquid storage, avoid mutual interference between functions, improve biogas purity and storage safety, and facilitate the separate collection and utilization of biogas slurry and biogas residue. Multiple motor-driven stirring devices achieve uniform mixing of materials and improve the efficiency of microbial reaction. The underground heating furnace ensures that the fermentation temperature is stable within a suitable range and is not affected by the ambient temperature, improving the stability of gas production throughout the year and solving the problem of difficult gas production in low-temperature environments.

[0017] II. This invention integrates a sludge-liquid separator to achieve efficient separation of biogas slurry and biogas residue. The biogas slurry can be directly used for irrigation and fertilization, while the biogas residue serves as solid organic fertilizer, avoiding resource waste and conforming to the concept of ecological agricultural recycling. The separated biogas slurry is free of impurities and is less likely to clog the conveying pipeline. The modular structure allows for independent maintenance of the pool, gas storage tank, and biogas slurry tank, eliminating the need to empty the gas storage tank and biogas slurry tank when repairing the pool. Feeding, discharging, and sludge removal are all controlled by pipelines and valves, making operation convenient and allowing ordinary farmers to complete the process independently, thus lowering the barrier to entry.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of the present invention;

[0021] Figure 2 This is a structural diagram from another perspective of the present invention;

[0022] Figure 3 This is a structural diagram of the motor of the present invention.

[0023] Attached reference numerals: 1. Tank body; 2. Gas storage tank; 3. Biogas slurry tank; 4. Gas transmission pipe; 5. Underground heating furnace; 6. Sludge-liquid separator; 7. Discharge pipe; 8. Liquid transmission pipe; 9. Sludge discharge pipe; 10. Motor; 11. Stirring rod; 12. Stirring blade; 13. Feed inlet. Detailed Implementation

[0024] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1-3 As shown, this embodiment of the invention provides a split-type biogas digester, including a digester body 1, a gas storage tank 2, and a biogas slurry tank 3. The gas storage tank 2 is located on the left side of the digester body 1, and the biogas slurry tank 3 is located on the right side of the digester body 1. A gas supply pipe 4 connects the digester body 1 and the gas storage tank 2. A discharge pipe 7 is connected to one side of the digester body 1. One end of the discharge pipe 7 is connected to a sludge-liquid separator 6. The liquid outlet end of the sludge-liquid separator 6 is connected to a liquid supply pipe 8. One end of the liquid supply pipe 8 is connected to the biogas slurry tank 3.

[0027] In one embodiment, an underground heating furnace 5 is installed at the bottom of the pool 1.

[0028] In one embodiment, one end of the slag-liquid separator 6 is connected to a slag discharge pipe 9.

[0029] In one embodiment, a plurality of motors 10 are uniformly installed on the top of the tank body 1, and a stirring rod 11 is fixedly connected to the output end of the motor 10. A plurality of stirring blades 12 are uniformly fixedly connected to the outer side wall of the stirring rod 11.

[0030] In one embodiment, a feed inlet 13 is provided on one side of the pool body 1.

[0031] In one embodiment, the discharge pipe 7, the liquid delivery pipe 8, and the slag discharge pipe 9 are each equipped with an independent valve for controlling the material conveying.

[0032] In one embodiment, the gas storage tank 2 is equipped with a pressure gauge and a safety valve to monitor the gas pressure inside the tank and to release pressure in case of overpressure.

[0033] In operation, the present invention works as follows: Crushed straw, livestock manure, and other organic waste, along with fermentation agents, are fed into the tank 1 through the feed inlet 13 on one side of the tank 1. An appropriate amount of water is added to adjust the fermentation concentration. The feed inlet 13 is then sealed, and the underground heating furnace 5 is activated to heat the tank 1 to a suitable fermentation temperature of 25-30°C. Multiple motors 10 at the top of the tank 1 are then activated to drive the stirring rods 11 and stirring blades 12 to rotate, thoroughly mixing the organic materials and fermentation liquid. This ensures uniform contact between the microorganisms and the materials, accelerating the anaerobic fermentation reaction. The stirring process can be started at set times to ensure effective mixing while avoiding excessive stirring that could affect microbial activity. The biogas produced during fermentation enters the gas storage tank 2 through the gas pipe 4 at the top of the tank 1. The pressure gauge on the gas storage tank 2 monitors the pressure in real time. When the gas pressure reaches the set value, it can be connected to gas stoves, biogas lamps, and other equipment through the gas pipeline. The safety valve ensures stable gas pressure inside the tank and avoids the risk of overpressure. After fermentation, the valve of the discharge pipe 7 is opened to transport the mixture of sludge and liquid in the tank 1 to the sludge-liquid separator 6. The sludge-liquid separator 6 starts working, and the separated biogas slurry is transported to the biogas slurry tank 3 for storage through the liquid pipeline 8. It can be directly transported to farmland and orchards as liquid organic fertilizer through pipelines. The separated biogas residue is discharged through the residue discharge pipe 9, dried, and used as solid organic fertilizer to achieve graded utilization of resources. After the residue is discharged, organic materials can be added again through the feed inlet 13 to repeat the above fermentation process. If the tank 1 needs to be repaired, only the relevant valves need to be closed. There is no need to affect the normal use of the gas storage tank 2 and the biogas slurry tank 3, making maintenance convenient.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A split-type biogas digester, characterized in that: The system includes a pool body (1), a gas storage tank (2), and a biogas slurry tank (3). The gas storage tank (2) is located on the left side of the pool body (1), and the biogas slurry tank (3) is located on the right side of the pool body (1). A gas supply pipe (4) connects the pool body (1) and the gas storage tank (2). A discharge pipe (7) is connected to one side of the pool body (1). One end of the discharge pipe (7) is connected to a sludge-liquid separator (6). The liquid outlet of the sludge-liquid separator (6) is connected to a liquid supply pipe (8). One end of the liquid supply pipe (8) is connected to the biogas slurry tank (3).

2. A split-type biogas digester according to claim 1, characterized in that: An underground heating furnace (5) is installed at the bottom of the pool (1).

3. A split-type biogas digester according to claim 1, characterized in that: One end of the slag-liquid separator (6) is connected to a slag outlet pipe (9).

4. A split-type biogas digester according to claim 1, characterized in that: Multiple motors (10) are evenly installed on the top of the pool body (1). A stirring rod (11) is fixedly connected to the output end of the motor (10). Multiple stirring blades (12) are evenly fixedly connected to the outer side wall of the stirring rod (11).

5. A split-type biogas digester according to claim 1, characterized in that: The pool body (1) has a feed inlet (13) on one side.

6. A split-type biogas digester according to claim 1, characterized in that: The discharge pipe (7), liquid delivery pipe (8), and slag discharge pipe (9) are all equipped with independent valves for controlling material conveying.

7. A split-type biogas digester according to claim 1, characterized in that: The gas storage tank (2) is equipped with a pressure gauge and a safety valve to monitor the gas pressure inside the tank and to release pressure in case of overpressure.

Images