Straw micro-aerobic-anaerobic integrated biogas fermentation device

Abstract

The utility model relates to the technical field of fermentation, in particular to a straw micro-aerobic-anaerobic integrated biogas fermentation device. The device comprises a total fermentation box, a hot water circulation heating system and a lateral flow micro-aeration system, straw fermentation liquid is added into reaction chambers through a feeding port, high-solid hydrolysis acid production is performed in a first reaction chamber, and then anaerobic fermentation is performed in a second reaction chamber; the jacket provides heat for the reaction chamber, so that the straw fermentation liquid is fermented at a set temperature; marsh gas generated in the fermentation process is collected through a gas collecting hole; in the fermentation process, the reactor forms a good natural stirring effect through a side flow micro-aeration mechanism. The micro-aerobic-anaerobic integrated structure reduces the occupied area of the device, reduces the maintenance cost and improves the volume utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of fermentation, in particular to a straw microaerobic-anaerobic integrated biogas fermentation device. Background Art

[0002] In agricultural production, after crop harvest, a large amount of straw waste is generated. Proper straw disposal poses a major challenge. Both direct burning and crushing and returning to the field have significant drawbacks. Anaerobic straw fermentation, through microbial decomposition and metabolism, ultimately produces combustible gases. This not only avoids environmental pollution but also generates economic benefits. Furthermore, micro-aerobic treatment during the straw hydrolysis and acidification process can effectively increase the hydrolysis rate and biogas production.

[0003] Patent CN117887560A describes a straw anaerobic fermentation device, which relates to the field of straw processing technology. It includes a straw crushing component, a processing component, and an insulated fermentation tank. It can process the original straw into small pieces of straw and then into a paste-like straw, thereby improving the fermentation speed and efficiency of straw, shortening the fermentation cycle, and having a good treatment effect on straw. Patent CN213570455U describes a straw biogas fermentation device. A hot stewing tank is added before the fermentation tank. The hot stewing tank includes a hot stewing sealed chamber and a stirring device to achieve hot stewing of the straw fragments. Before fermentation, it can accelerate the destruction of the wood structure of the plant straw cell wall, which is conducive to increasing the fermentation rate. Patent CN116216924A describes an anaerobic digestion system with side stream micro-aeration coupled with mainstream electric drive, which relates to the field of anaerobic digestion treatment technology. It includes a side stream micro-aeration reactor and a mainstream MEC reactor. By combining two-phase reactions, it improves the hydrolysis efficiency of organic matter and methane production, and has a good effect on the fermentation of organic waste with a high solid content.

[0004] Existing common fermentation devices suffer from insufficient stirring of the fermentation liquid, low straw fermentation gas production rate, and low volume utilization. Therefore, developing a straw fermentation device with sufficient stirring, efficient gas production, and suitable for high-solid fermentation is of great significance for the efficient utilization of straw and saving manufacturing costs. Summary of the Invention

[0005] To overcome the aforementioned deficiencies in the prior art, the present invention provides a straw microaerobic-anaerobic integrated biogas fermentation device. This device utilizes sidestream micro-aeration to achieve natural agitation of the fermentation liquid, eliminating the need for a mechanical agitator and saving costs. The integrated microaerobic-anaerobic design reduces device footprint and improves volume utilization. A sieve plate is provided at the bottom of the first reaction chamber, enabling high-solid microaerobic fermentation of straw in the first reaction chamber, increasing straw hydrolysis and acid production. Anaerobic treatment in the second reaction chamber effectively increases both gas production rate and volume.

[0006] The technical principle of this utility model:

[0007] A straw microaerobic-anaerobic integrated biogas fermentation device is provided. Straw fermentation liquid is added to a first reaction chamber through a feed port. The side stream liquid is micro-aerated under the action of an aeration pump. The fermentation liquid is sprayed into the first reaction chamber through a spray head driven by the side stream pump and mixed with the fermentation liquid. High-solid microaerobic fermentation is carried out in the first reaction chamber. The mixed liquid is filtered through a sieve plate in the first reaction chamber and then anaerobically fermented in a second reaction chamber. The generated biogas is collected through a gas collecting port. The fermentation liquid in the second reaction chamber flows into the side stream chamber for micro-aeration and then flows back to the first reaction chamber.

[0008] The technical solution of this utility model:

[0009] A straw microaerobic-anaerobic integrated biogas fermentation device comprises a main fermentation reaction chamber, a hot water circulation heating mechanism, and a side stream micro-aeration mechanism. The main fermentation reaction chamber consists of a first reaction chamber and a second reaction chamber. A feed port is provided on the left side of the top of the first reaction chamber, a first reaction chamber gas collection hole is provided on the right side of the top of the first reaction chamber, and an ORP and tank temperature sensor are provided on the left side wall of the first reaction chamber. The second reaction chamber consists of three parallel anaerobic reaction chambers, which are surrounded by baffle 1, baffle 2, and a three-phase separator. A second reaction chamber gas collection hole is provided at the center of the top of the second reaction chamber. A head plate is provided on the top of the first and second reaction chambers. The first and second reaction chambers are separated by baffle 1, and baffle 2 is provided on the right side of baffle 1.

[0010] Furthermore, the hot water circulation heating mechanism includes a jacket, a water tank, a hot water circulation pipe 1, a hot water circulation pipe 2, a jacket temperature sensor, a hot water circulation pump, and a heating pipe. A jacket temperature sensor is provided above the jacket, the lower right side of the jacket is connected to the hot water circulation pipe 1, a hot water circulation pump is provided on the hot water circulation pipe 1, the other side of the hot water circulation pipe 1 is connected to the water tank, and a heating pipe is provided in the water tank.

[0011] Furthermore, the side stream micro-aeration mechanism includes a side stream chamber, a side stream tube, a side stream pump, a spray plate, an aeration pump, an aeration plate, and an aeration hose. The side stream chamber is arranged on the upper right side of the second reaction chamber, the side stream chamber is connected to the side stream tube, a side stream pump is provided on the side stream tube, the other side of the side stream tube is connected to the spray plate, the spray plate is arranged at the top center of the first reaction chamber, an aeration plate is provided inside the side stream chamber, the aeration plate is connected to the aeration hose, and an aeration pump is provided on the other side of the aeration hose.

[0012] Furthermore, a screen is provided at the bottom of the first reaction chamber.

[0013] Furthermore, a discharge port is provided at the bottom of the side plate of the first reaction chamber.

[0014] Furthermore, the jacket wraps the first reaction chamber, the second reaction chamber and the side flow chamber.

[0015] Furthermore, the side flow pump is a peristaltic pump.

[0016] Furthermore, the side flow chamber is connected to the second reaction chamber through a pipeline.

[0017] The beneficial effects of the utility model are:

[0018] The utility model provides a straw microaerobic-anaerobic integrated biogas fermentation device with the following advantages: (1) The microaerobic-anaerobic integrated structure is compact, which reduces the device footprint, reduces maintenance costs, and improves volume utilization. (2) The three-phase separator and side stream aeration mechanism are used to form a good natural stirring effect in the reactor. (3) The straw in the first reaction chamber is subjected to microaerobic conditions, which accelerates the hydrolysis and acid production of the straw. The fermentation liquid in the second reaction chamber is subjected to anaerobic conditions, which increases the anaerobic fermentation gas production rate and improves biogas production. (4) The fermentation device has no moving parts and does not require a mechanical motion device, which reduces the cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main view of a straw microaerobic-anaerobic integrated biogas fermentation device.

[0020] In the figure: 1. First reaction chamber; 2. ORP and tank temperature sensor; 3. Discharge port of first reaction chamber; 4. Sieve plate; 5. Baffle 1; 6. Second reaction chamber; 7. Baffle 2; 8. Jacket; 9. Heating tube; 10. Water tank; 11. Hot water circulation tube 1; 12. Hot water pump; 13. Jacket temperature sensor; 14. Side flow chamber; 15. Side flow tube; 16. Head plate; 17. Gas collecting hole of second reaction chamber; 18. Three-phase separator; 19. Side flow pump; 20. Gas collecting hole of first reaction chamber; 21. Spray plate; 22. Feed port.

[0021] Figure 2 This is a rear view schematic diagram of a straw microaerobic-anaerobic integrated biogas fermentation device.

[0022] In the figure; 23. Aeration pump; 24. Hot water circulation pipe 2; 25. Aerator plate; 26. Aeration hose. Implementation Method

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the following text is only for describing one or several specific implementations of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention. Example

[0024] See also Figure 1 and Figure 2 The utility model provides a technical solution: a straw microaerobic-anaerobic integrated biogas fermentation device, including a total fermentation reaction chamber consisting of a first reaction chamber 1 and a second reaction chamber 6, a feed inlet 22 is provided on the left side of the top of the first reaction chamber 1, a first reaction chamber air collecting hole 20 is provided on the right side of the top of the first reaction chamber 1, an ORP and tank temperature sensor 2 is provided on the left side wall of the first reaction chamber, the second reaction chamber 6 is composed of three parallel anaerobic reaction chambers, the anaerobic reaction chamber is surrounded by a baffle 1 5, a baffle 2 7 and a three-phase separator 18, a second reaction chamber air collecting hole 17 is provided at the center of the top of the second reaction chamber 6, a head plate 16 is provided on the top of the first reaction chamber 1 and the second reaction chamber 6, the first reaction chamber 1 and the second reaction chamber 6 are separated by a baffle 1 5, a baffle 2 7 is provided on the right side of the baffle 1 5, the hot water circulation heating system includes a jacket 8, a water tank 10, a hot water circulation pipe 1 11, a hot water circulation pipe 2 4. Jacket temperature sensor 13, hot water circulation pump 12, heating pipe 9. The jacket 8 is provided with a jacket temperature sensor 13 above the jacket. The lower right side of the jacket 8 is connected to the hot water circulation pipe 11. The hot water circulation pipe 11 is provided with a hot water circulation pump 12. The other side of the hot water circulation pipe 11 is connected to the water tank 10. The water tank 10 is provided with a heating pipe 9. The side flow micro aeration mechanism includes a side flow chamber 14, a side flow pipe 15, a side flow pump 19, a spray plate 21, an aeration Pump 23, aeration plate 25, aeration hose 26, the side flow chamber 14 is arranged on the upper right side of the second reaction chamber 6, the side flow chamber 14 is connected to the side flow pipe 15, the side flow pipe 15 is provided with a side flow pump 19, the other side of the side flow pipe 15 is connected to the spray plate 21, the water distributor is arranged at the top center of the first reaction chamber 1, the inside of the side flow chamber 14 is provided with an aeration plate 25, the aeration plate 25 is connected to the aeration hose 26, and the other side of the aeration hose 26 is provided with an aeration pump 23.

[0025] As an embodiment of the present invention, a filter plate is provided at the bottom of the first reaction chamber so that the liquid in the fermentation liquid can flow to the second reaction chamber, and the straw residue remains in the first reaction chamber to realize high-solid fermentation of the first reaction and accelerate hydrolysis and acid production.

[0026] As an embodiment of the present invention, a discharge port is provided at the bottom of the side plate of the first reaction chamber so that the solid material can be discharged from the first reaction chamber.

[0027] As an embodiment of the present invention, the jacket wraps the first reaction chamber, the second reaction chamber and the side flow chamber, so that the straw fermentation is carried out at a set temperature.

[0028] As an embodiment of the present invention, the side stream pump is a peristaltic pump, which improves the flow rate regulation accuracy and accelerates the hydrolysis of straw to produce acid.

[0029] As an embodiment of the present invention, the side flow chamber is connected to the second reaction chamber via a pipeline, so that the fermentation liquid can enter the side flow chamber for recycling.

[0030] The specific use process of this utility model is as follows:

[0031] The straw fermentation liquid is poured into the first reaction chamber 1 through the feed port 22. It passes through the sieve plate 4 at the bottom of the first reaction chamber 1. The straw residue remains in the first reaction chamber, where it undergoes hydrolysis and acidification under microaerobic conditions. The filtrate flows from the first reaction chamber 1 into the second reaction chamber 6. The fermentation liquid in the second reaction chamber 6 then flows through the baffle into the sidestream chamber 14. The aeration pump 23 is activated to aerate the sidestream chamber 14. The sidestream pump 19 sprays the aerated sidestream liquid through the spray plate 21 into the first reaction chamber 1, where it is mixed with the fermentation liquid in the first reaction chamber 1. The heating pipe 9 heats the water in the water tank 10. The hot water circulation pump 12 directs hot water into the jacket 8 through hot water circulation pipe 11. The cold water in the jacket 8 is then discharged from the jacket 8 through hot water circulation pipe 24. The jacket 8 heats the first reaction chamber 1, the second reaction chamber 6, and the sidestream chamber 14. The ORP and the temperature of the fermentation liquid in the first reaction chamber 1 are detected by the ORP sensor 2. When the ORP reaches the set value, sidestream pump 19 and aeration pump 23 stop operating. When the tank temperature reaches the set value, electric heating tube 9 and hot water circulation pump 12 stop operating, maintaining the ORP and tank temperature within the set range. During the fermentation process, biogas produced in the first reaction chamber 1 is collected through the first reaction gas collection hole 20, and biogas produced in the second reaction chamber 6 is collected through the second reaction gas collection hole 17.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A straw microaerobic-anaerobic integrated biogas fermentation device, characterized in that: The invention comprises a total fermentation reaction chamber, a hot water circulation heating mechanism, and a side stream micro-aeration mechanism. The total fermentation reaction chamber consists of a first reaction chamber (1) and a second reaction chamber (6). A feed port (22) is provided on the left side of the top of the first reaction chamber (1), a first reaction chamber air collecting hole (20) is provided on the right side of the top of the first reaction chamber (1), an ORP and tank temperature sensor (2) is provided on the left side wall of the first reaction chamber, and the second reaction chamber (6) consists of three parallel anaerobic reaction chambers. The anaerobic reaction chamber is surrounded by a baffle plate 1 (5), a baffle plate 2 (7) and a three-phase separator (18). A second reaction chamber air collecting hole (17) is provided at the center of the top of the second reaction chamber (6). A head plate (16) is provided on the top of the first reaction chamber (1) and the second reaction chamber (6). The first reaction chamber (1) and the second reaction chamber (6) are separated by a baffle plate 1 (5), and a baffle plate 2 (7) is provided on the right side of the baffle plate 1 (5).

2. A straw microaerobic-anaerobic integrated biogas fermentation device according to claim 1, characterized in that: The hot water circulation heating mechanism comprises a jacket (8), a water tank (10), a hot water circulation pipe 1 (11), a hot water circulation pipe 2 (24), a jacket temperature sensor (13), a hot water circulation pump (12), and a heating pipe (9). A jacket temperature sensor (13) is provided above the jacket (8). The lower right side of the jacket (8) is connected to the hot water circulation pipe 1 (11). The hot water circulation pump (12) is provided on the hot water circulation pipe 1 (11). The other side of the hot water circulation pipe 1 (11) is connected to the water tank (10). A heating pipe (9) is provided in the water tank (10).

3. The straw microaerobic-anaerobic integrated biogas fermentation device according to claim 1, characterized in that: The side flow micro aeration mechanism comprises a side flow chamber (14), a side flow tube (15), a side flow pump (19), a spray plate (21), an aeration pump (23), an aeration plate (25), and an aeration hose (26). The side flow chamber (14) is arranged on the upper right side of the second reaction chamber (6). The side flow chamber (14) is connected to the side flow tube (15). The side flow tube (15) is provided with a side flow pump (19). The other side of the side flow tube (15) is connected to the spray plate (21). The spray plate (21) is arranged at the top center of the first reaction chamber (1). The inside of the side flow chamber (14) is provided with an aeration plate (25). The aeration plate (25) is connected to the aeration hose (26). The other side of the aeration hose (26) is provided with an aeration pump (23).

4. The straw microaerobic-anaerobic integrated biogas fermentation device according to claim 1, characterized in that: A screen (4) is provided at the bottom of the first reaction chamber (1).

5. The straw microaerobic-anaerobic integrated biogas fermentation device according to claim 1, characterized in that: A discharge port (3) is provided at the bottom of the side plate of the first reaction chamber (1).

6. The straw microaerobic-anaerobic integrated biogas fermentation device according to claim 2, characterized in that: The jacket (8) encloses the first reaction chamber (1), the second reaction chamber (6) and the side flow chamber (14).

7. The straw microaerobic-anaerobic integrated biogas fermentation device according to claim 3, characterized in that: The side flow pump (19) is a peristaltic pump.

8. The straw microaerobic-anaerobic integrated biogas fermentation device according to claim 3, characterized in that: The side flow chamber (14) is connected to the second reaction chamber (6) through a pipeline.

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