Full-underground biogas device adopting full-dry fermentation process

Abstract

The utility model relates to the technical field of renewable energy sources, and particularly discloses a full-underground biogas device adopting a full-dry fermentation process, which comprises a raw material mixing pool, a deslagging pipeline, a biogas slurry return pipe, a feeding pipe and an overflow pipe are fixedly connected in the raw material mixing tank in a communicating manner; a large number of biogas fermentation raw materials are stored in the raw material mixing pool, then the raw materials in the raw material mixing pool are conveyed into the fermentation tank body through the feeding pipe for full-dry fermentation, biogas residues are discharged into the raw material mixing pool through the residue discharging pipeline, and then biogas slurry in the fermentation tank body is controlled through the biogas slurry return pipe. The highest biogas slurry height in the fermentation tank body is controlled through the overflow pipe, so that the biogas raw materials are all in the biogas slurry; meanwhile, the raw material mixing pool and the fermentation tank body are positioned in the deep soil for heat preservation, so that the production of biogas can be normally carried out in winter, and the problem that the existing biogas fermentation device cannot be adjusted to effectively ferment biogas in winter is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of renewable energy, specifically a fully underground biogas device with a full dry fermentation process. Background Art

[0002] Biogas is a renewable bioenergy, mainly produced by the fermentation of organic substances under anaerobic conditions by microorganisms. Biogas is a mixed gas, the main component of which is methane (about 50% to 70%), followed by carbon dioxide (about 25% to 40%), and also contains a small amount of nitrogen, oxygen, hydrogen sulfide, carbon monoxide, etc.; methane is the most energy - valuable part of biogas and is the main component for combustion and heat generation.

[0003] A Chinese invention patent with the publication number CN107012074B was published on January 9, 2024. It relates to the technical field of biogas and addresses the technical problems of existing technologies that use cement, concrete, bricks, etc. to build underground by excavation. When removing biogas residues, it requires manual extraction from the slag discharge port, which is not only troublesome to manufacture and complex to operate, but also prone to air leakage, not convenient for expanding the volume, and even less transportable. The cost of the integrated biogas digester mold is high, and the size is fixed and cannot flexibly change the volume. It adopts a modular - designed pool body, with a pressure chamber set at the top of the pool body. There is a slag discharge pipe on one side of the pressure chamber. One end of the feed pipe is set above the pressure chamber, and the other end passes through the pressure chamber and is located in the biogas slurry layer inside the pool body. One end of the exhaust pipe is set above the pressure chamber, and the other end passes through the pressure chamber and is located in the biogas layer inside the pool body. The surface of the bottom of the pressure chamber in contact with the pool body is provided with a pressure chamber pipe. One end of the pressure chamber pipe is set inside the pressure chamber, and the other end extends to the biogas residue layer inside the pool body. This invention is very convenient for production, assembly, and transportation.

[0004] However, the above - disclosed solution has the following deficiencies: In the existing biogas generating device, the large - area interconnected fermentation spaces enable the rapid movement of biogas residues, biogas slurry, and air, resulting in poor heat preservation. Thus, in the low - temperature environment in winter, the efficiency of biogas production is affected. Content of the Utility Model

[0005] The purpose of the utility model is to solve the technical problem that in the existing biogas generating device, the large - area interconnected fermentation spaces enable the rapid movement of biogas residues, biogas slurry, and air, resulting in poor heat preservation, and thus affecting the efficiency of biogas production in the low - temperature environment in winter, and to provide a fully underground biogas device with a full dry fermentation process.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions to be realized;

[0007] The fully underground biogas device using the fully dry fermentation process described in the present utility model includes a raw material mixing tank; a slag discharge pipe, a biogas slurry return pipe, a feed pipe, and an overflow pipe are connected and fixed inside the raw material mixing tank; the ends of the slag discharge pipe, the biogas slurry return pipe, the feed pipe, and the overflow pipe are connected and fixed to a fermentation tank body; a first valve and a second valve are respectively provided on the slag discharge pipe and the biogas slurry return pipe; a feed motor is provided on the feed pipe; an air storage chamber is connected and fixed to the upper end of the fermentation tank body; a gas guide pipe is connected and fixed to the side of the air storage chamber; a filter pipe is connected and fixed to the lower end of the air storage chamber; a filter baffle is fixed corresponding to the biogas slurry return pipe inside the raw material mixing tank.

[0008] Furthermore, the raw material mixing tank, the air storage chamber, and the gas guide pipe are covered with heat preservation plates at the upper ends.

[0009] Furthermore, the raw material mixing tank is made by building walls with concrete and bricks.

[0010] Furthermore, a climbing ladder is fixed on the inner wall of the raw material mixing tank.

[0011] Furthermore, a fixing plate is fixed on the inner wall of the raw material mixing tank; a stirring motor is fixed on the fixing plate; a spiral auger is fixed on the output shaft of the stirring motor; the lower end of the spiral auger is rotatably inserted into the bottom wall of the raw material mixing tank.

[0012] The biogas generated in the fermentation tank body enters the air storage chamber for temporary storage, and then is stored externally in a gas storage cabinet through the gas guide pipe.

[0013] The fully underground biogas device using the fully dry fermentation process provided by the present utility model has the following beneficial effects:

[0014] 1. In the present utility model, a large amount of biogas fermentation raw materials are stored in the raw material mixing tank, and then the raw materials in the raw material mixing tank are transported to the fermentation tank body through the feed pipe for fully dry fermentation. The biogas residues are discharged into the raw material mixing tank through the slag discharge pipe, and then the biogas slurry in the fermentation tank body is controlled through the biogas slurry return pipe, so that the biogas raw material fermentation is always in a high-concentration state. Then, the highest biogas slurry height in the fermentation tank body is controlled through the overflow pipe, so that all biogas raw materials are in the biogas slurry; at the same time, the raw material mixing tank and the fermentation tank body are located deep in the soil for heat preservation, so that the production of biogas in winter can also proceed normally, solving the problem that the existing biogas fermentation device cannot be adjusted to effectively ferment biogas in winter.

[0015] 2. In the present utility model, the heat preservation plates can isolate the low temperature on the ground surface from being transmitted to the underground raw material mixing tank and fermentation tank body in winter, affecting fermentation, so that the raw material mixing tank and the fermentation tank body always maintain an appropriate temperature to generate biogas, and the production of biogas in winter can also proceed normally. Description of the Drawings

[0016] The following further describes in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings;

[0017] Figure 1 It is a schematic isometric view of the first structure of the present utility model;

[0018] Figure 2 It is a schematic isometric view of the second structure of the present utility model;

[0019] Figure 3 It is a schematic isometric view of the third structure of the present utility model;

[0020] Figure 4 It is a schematic isometric view of the fourth structure of the present utility model.

[0021] Explanation of the reference numerals in the figure: 1. Raw material mixing tank; 2. Climbing ladder; 3. Fixed plate; 4. Stirring motor; 5. Screw auger; 6. Slag discharge pipe; 7. Biogas slurry return pipe; 8. Feed pipe; 9. Overflow pipe; 10. First valve; 11. Second valve; 12. Feed motor; 13. Fermentation tank body; 14. Gas storage chamber; 15. Gas guide pipe; 16. Filter pipe; 17. Filter baffle; 18. Heat preservation board. Specific embodiments

[0022] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that all the directional indications (such as up - down - left - right - front - back...) in the embodiments of the present utility model are only used to explain the relative positional relationship - movement conditions, etc. between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. The described connection can be a direct connection or an indirect connection.

[0025] Please refer to Figures 1-4As shown in the figure, the fully underground biogas device using the full-dry fermentation process includes a raw material mixing tank 1; a slag discharge pipe 6, a biogas slurry return pipe 7, a feed pipe 8, and an overflow pipe 9 are connected and fixed inside the raw material mixing tank 1; the ends of the slag discharge pipe 6, the biogas slurry return pipe 7, the feed pipe 8, and the overflow pipe 9 are connected and fixed to a fermentation tank body 13; a first valve 10 and a second valve 11 are respectively arranged on the slag discharge pipe 6 and the biogas slurry return pipe 7; a feed motor 12 is arranged on the feed pipe 8; the upper end of the fermentation tank body 13 is connected and fixed with a gas storage chamber 14; a gas guide pipe 15 is connected and fixed to the side of the gas storage chamber 14; a filter pipe 16 is connected and fixed to the lower end of the gas storage chamber 14; a filter baffle 17 is fixed corresponding to the biogas slurry return pipe 7 inside the raw material mixing tank 1; during operation, a large amount of biogas fermentation raw materials are stored in the raw material mixing tank 1, and then the raw materials in the raw material mixing tank 1 are transported into the fermentation tank body 13 through the feed pipe 8 for full-dry fermentation. The biogas residues are discharged into the raw material mixing tank 1 through the slag discharge pipe 6, and then the biogas slurry in the fermentation tank body 13 is controlled through the biogas slurry return pipe 7, so that the biogas raw material fermentation is always in a high-concentration state. Then, the highest biogas slurry height in the fermentation tank is controlled through the overflow pipe 9, so that all biogas raw materials are in the biogas slurry. At the same time, the raw material mixing tank 1 and the fermentation tank body 13 are located deep in the soil for heat preservation, so that the production of biogas in winter can also proceed normally, solving the problem that the existing biogas fermentation device cannot be adjusted to effectively ferment biogas in winter.

[0026] The upper ends of the raw material mixing tank 1, the gas storage chamber 14, and the gas guide pipe 15 are covered with a heat preservation board 18; during operation, through the heat preservation board 18, the low temperature on the ground surface can be isolated from being transmitted underground to the raw material mixing tank 1 and the fermentation tank body 13 to affect fermentation in winter, so that the raw material mixing tank 1 and the fermentation tank body 13 always maintain an appropriate temperature to produce biogas, and the production of biogas in winter can also proceed normally.

[0027] The raw material mixing tank 1 is made of concrete and brick walls; during operation, the raw material mixing tank 1 made of concrete and brick walls can create a larger volume in the underground space, so that a large amount of raw materials can be stored at one time and the raw materials can be stored with heat preservation.

[0028] A climbing ladder 2 is fixed on the inner wall of the raw material mixing tank 1; during operation, through the climbing ladder 2, personnel can enter and exit the bottom of the raw material mixing tank 1 to open and close the first valve 10 and the second valve 11, so as to control the content of biogas slurry and biogas residues in the fermentation tank body 13, so that the full-dry fermentation in the fermentation tank body 13 is thorough and stable, solving the problem that the existing biogas generator cannot be intervened by too much manual operation.

[0029] A fixed plate 3 is fixedly connected to the inner wall of the raw material mixing tank 1; a stirring motor 4 is fixedly connected to the fixed plate 3; a spiral auger 5 is fixedly connected to the output shaft of the stirring motor 4; the lower end of the spiral auger 5 is rotatably inserted into the bottom wall of the raw material mixing tank 1; during operation, the fixed plate 3 cooperates with the bottom wall of the raw material mixing tank 1 to fix and limit the spiral auger 5, so as to prevent eccentric rotation due to excessive length and inability to perform the stirring function, enabling the spiral auger 5 to rotate stably under the normal drive of the stirring motor 4.

[0030] The biogas generated in the fermentation tank body 13 enters the gas storage chamber 14 for temporary storage, and then is externally connected to a gas storage tank through the gas guide pipe 15 for storage.

[0031] With the above scheme, when the utility model is in use, a large amount of biogas fermentation raw materials are stored in the raw material mixing tank 1, and then the raw materials in the raw material mixing tank 1 are transported into the fermentation tank body 13 through the feed pipe 8 for full dry fermentation. The biogas residues are discharged into the raw material mixing tank 1 through the slag discharge pipeline 6, and then the biogas slurry in the fermentation tank body 13 is controlled through the biogas slurry return pipe 7, so that the biogas fermentation is always in a high-efficiency state. Then, the highest biogas slurry height in the fermentation tank body 13 is controlled through the overflow pipe 9, so as to control the biogas fermentation within the highest efficiency range; at the same time, the raw material mixing tank 1 and the fermentation tank body 13 are located deep in the soil for heat preservation, enabling the production of biogas in winter to proceed normally, solving the problem that the existing biogas fermentation device cannot be adjusted to effectively ferment biogas in winter; the heat preservation board 18 can isolate the low temperature on the ground surface from being transmitted to the underground raw material mixing tank 1 and fermentation tank body 13 in winter, affecting fermentation, so that the raw material mixing tank 1 and the fermentation tank body 13 always maintain an appropriate temperature to generate biogas, enabling the production of biogas in winter to proceed normally; the raw material mixing tank 1 made of concrete and brick walls can create a larger volume in the underground space, so that a large amount of raw materials can be stored at one time and the raw materials can be stored with heat preservation; through the climbing ladder 2, personnel can enter and exit the bottom of the raw material mixing tank 1 to open and close the first valve 10 and the second valve 11, so as to control the content of biogas slurry and biogas residues in the fermentation tank body 13, making the full dry fermentation in the fermentation tank body 13 thorough and stable, solving the problem that the existing biogas generator cannot be intervened manually too much; the fixed plate 3 cooperates with the bottom wall of the raw material mixing tank 1 to fix and limit the spiral auger 5, so as to prevent eccentric rotation due to excessive length and inability to perform the stirring function, enabling the spiral auger 5 to rotate stably under the normal drive of the stirring motor 4.

[0032] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model; in this specification, any modifications, equivalent substitutions and improvements made within the spirit and principle of this patent shall be included within the protection scope of this patent.

[0033] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. The fully dry fermentation process fully underground biogas device is characterized in that; It includes a raw material mixing tank (1); a slag discharge pipe (6), a biogas slurry return pipe (7), a feed pipe (8) and an overflow pipe (9) are connected and fixed inside the raw material mixing tank (1); the ends of the slag discharge pipe (6), the biogas slurry return pipe (7), the feed pipe (8) and the overflow pipe (9) are connected and fixed to a fermentation tank body (13); a first valve (10) and a second valve (11) are respectively arranged on the slag discharge pipe (6) and the biogas slurry return pipe (7); a feed motor (12) is arranged on the feed pipe (8); an air storage chamber (14) is connected and fixed to the upper end of the fermentation tank body (13); a gas guide pipe (15) is connected and fixed to the side surface of the air storage chamber (14); a filter pipe (16) is connected and fixed to the lower end of the air storage chamber (14); a filter baffle (17) is fixedly connected inside the raw material mixing tank (1) corresponding to the biogas slurry return pipe (7).

2. The fully underground biogas device with a fully dry fermentation process according to claim 1, characterized in that: The upper ends of the raw material mixing tank (1), the air storage chamber (14) and the gas guide pipe (15) are covered with a heat preservation board (18).

3. The fully underground biogas device with a full dry fermentation process according to claim 2, characterized in that: The raw material mixing tank (1) is made by building a wall with concrete and bricks.

4. The fully underground biogas device with a fully dry fermentation process according to claim 3, characterized in that: A climbing ladder (2) is fixedly connected to the inner wall of the raw material mixing tank (1).

5. The fully underground biogas device with a fully dry fermentation process according to claim 4, characterized in that: A fixed plate (3) is fixedly connected to the inner wall of the raw material mixing tank (1); a stirring motor (4) is fixedly connected to the fixed plate (3); a spiral auger (5) is fixedly connected to the output shaft of the stirring motor (4); the lower end of the spiral auger (5) is rotatably inserted into the bottom wall of the raw material mixing tank (1).

6. The fully underground biogas device with a fully dry fermentation process according to claim 5, characterized in that: The biogas generated in the fermentation tank body (13) enters the air storage chamber (14) for temporary storage, and then is stored externally in a gas storage cabinet through the gas guide pipe (15).

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