Two-phase three-groove simple plug-flow efficient anaerobic successive fermentation device

Abstract

The invention discloses a two-phase three-groove simple plug-flow efficient anaerobic successive fermentation device which comprises a fermentation tank body, a first auxiliary pool and a second auxiliary pool which are arranged from outside to inside are arranged in the fermentation tank body, a main pool is formed between the first auxiliary pool and the inner wall of the fermentation tank body, and one main pool and two auxiliary pools are arranged in parallel. A first auxiliary pool partition plate is additionally arranged in the middle of the interior of the first auxiliary pool, the upper edge of the first auxiliary pool partition plate is higher than all the main and auxiliary pool walls, and the bottom of the first auxiliary pool partition plate is hollowed out to form a channel. The interior of the fermentation tank body is divided into the main pool, the first auxiliary pool and the second auxiliary pool, so that when entering the fermentation tank body through the feeding pipe, the straw and manure mixed raw materials are subjected to accumulation fermentation for enough residence time, and are completely decomposed into biogas residues through fermentation strains, and the biogas residues are completely decomposed into biogas residues through the fermentation strains. And the fermented and decomposed biogas residues are discharged through an output pipe of the pressure pump.

Description

Technical Field

[0001] This invention relates to the field of microbial fermentation tank technology, specifically a two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device. Background Technology

[0002] For decades, the main type of anaerobic fermentation equipment using mixed feedstocks has been the fully mixed fermenter. Market testing has shown that even the best-performing daily gas production rate per unit volume is only 1.6 m³. 3 .m 3 / d, biogas production per ton of straw <300m³ 3 Operating costs remain high;

[0003] Furthermore, the basic construction scale of anaerobic fermentation units under the mainstream technology in the past was 10,000 m³ per day. 3 Biogas requires a 10,000m³ construction site. 3 The construction cost of large-volume fermentation tanks is also high. These two factors combined make it difficult for most companies involved in this industry to achieve self-sufficiency, let alone sustainable development. This invention can achieve a daily gas production rate of 5m³ per unit volume. 3 .m 3 / d, with the same construction scale, daily output of 10,000 m³ 3 Only 2000m² of building space is needed 3 A fermentation tank of a certain volume is sufficient, and the construction cost is only 1 / 5 of that in the past, which shows the efficiency and significance of the technology of this invention.

[0004] The industry has also introduced horizontal flow fermentation devices, which have improved fermentation efficiency, but due to their complex structure, heavy equipment, large investment, and great difficulties in manufacturing and maintenance, they have not been able to achieve large-scale market promotion and application.

[0005] Patent publication number CN 208717342 U discloses a high-concentration mixed raw material wet fermentation tank, characterized by its ability to demonstrate the superiority of a two-phase integrated three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation. It avoids a series of operational problems existing in previous anaerobic fermentation devices, such as crusting, wall adhesion, scum formation, stratification, short-circuiting, and incomplete carbon decomposition. This invention enables large-scale market promotion and application, thereby allowing the biogas-based biomethane industry to develop on a profitable, replicable, and sustainable track, independent of government subsidies. Summary of the Invention

[0006] The purpose of this invention is to provide a sequentially ordered fermentation device that integrates the acid-producing and methanogenic phases and clearly separates new and old materials, using the simplest and most feasible ingenious design and construction. This addresses the numerous problems mentioned in the background art, such as low biogas production efficiency and high construction costs. It significantly improves the daily gas production rate per unit volume and the gas production per ton of straw, achieving the long-sought goal of substantially reducing construction and operating costs.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A two-phase, three-tank, simplified plug-flow, high-efficiency anaerobic sequential fermentation device includes a fermentation tank. The fermentation tank contains a first auxiliary tank and a second auxiliary tank arranged from the outside to the inside. The first auxiliary tank and the inner wall of the fermentation tank form a main tank, resulting in one main tank and two auxiliary tanks. The walls of the main tank, the first auxiliary tank, and the second auxiliary tank are at the same height. A first auxiliary tank baffle is added in the center of the first auxiliary tank. The upper edge of the first auxiliary tank baffle is higher than the height of all the walls of the main and auxiliary tanks. The top of the first auxiliary tank baffle is hollowed out to form a gas channel, and the bottom of the first auxiliary tank baffle is hollowed out to form a material channel.

[0009] The top of the fermentation tank is provided with multiple feed inlets. Two seasoning pools are fixedly installed at the top of the fermentation tank. Multiple feed pipes are fixedly installed at the bottom of each seasoning pool. The feed pipes are inserted into the interior of the fermentation tank through the feed inlets. The two seasoning pools are respectively provided with inoculum back-extraction pipes. Pressure pumps are fixedly installed on both sides of the center of the top of the fermentation tank. The pressure pumps are connected to the main tank of the fermentation tank through pipes and inserted into the main tank at 1 / 2 of the material height. The pressure pumps provide power to realize the back-extraction of inoculum into the seasoning pool.

[0010] Multiple plunger-type material stirring devices are installed at the top of the fermentation tank along the edge of the main tank. The stirring devices are inserted into the bottom of the fermentation tank through pipes. The plunger-type pump uses a one-way valve to generate reciprocating motion to achieve one-way bottom outflow of material, thereby driving micro-stirring of the material at the bottom of the fermentation tank.

[0011] A first auxiliary pool wall is fixedly installed on the outer side of the inside of the fermentation tank, and a second auxiliary pool wall is fixedly installed on the inner side of the inside of the fermentation tank. A first auxiliary pool partition is fixedly installed between the first auxiliary pool wall and the second auxiliary pool wall. The top of the first auxiliary pool partition is fixedly and perforatedly connected to the inner wall of the top of the fermentation tank, and the bottom of the first auxiliary pool partition is fixedly and perforatedly connected to the bottom of the fermentation tank.

[0012] A seasoning tank is installed above the inner wall of the fermenter and the wall of the first auxiliary tank. The position between the wall of the first auxiliary tank and the wall of the second auxiliary tank is designated as the first auxiliary tank. The inner side of the wall of the second auxiliary tank is designated as the second auxiliary tank. A conical space bottom is provided on the bottom surface of the interior of the second auxiliary tank. A slag discharge pipe is fixedly installed at the bottom end of the conical space bottom.

[0013] A biogas outlet pipe is fixedly installed at the center of the top of the fermentation tank, and microbial inoculum return and output pipes are fixedly installed on both sides of the other two sides of the top of the fermentation tank. The microbial inoculum return and output pipes extend through the top of the fermentation tank and into the interior of the fermentation tank.

[0014] The inner sides of the first and second auxiliary pool walls are divided into three layers from top to bottom. Temperature sensors, material concentration sensors, and pH sensors are respectively installed at each layer position on the inner and outer surfaces of the first and second auxiliary pool walls. Material height sensors are installed at the top of the first and second auxiliary pool walls.

[0015] The fermentation tank is equipped with a positive and negative pressure protector on its top.

[0016] Twelve plunger-type material stirring devices are installed along the edge of the main tank at the position where the feed pipe contacts the main tank. The stirring devices are inserted into the bottom of the fermentation tank through pipes, with side openings in the same direction. The plunger-type pump uses a one-way valve to generate reciprocating motion to achieve unidirectional bottom outflow of material, thereby driving micro-stirring of the material at the bottom of the fermentation tank.

[0017] The seasoning pool wall panel at the top of the fermentation tank is configured as a sandwich structure, with a waste heat recovery and heat exchange circulation pipeline inside.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention utilizes the one-way valve of the plunger pump to ensure that the straw and manure mixture inside the fermentation tank is stirred evenly through material flow, thereby increasing the fermentation rate. Furthermore, the stirring rod maintains the fermentation temperature of the material at the optimal environment for microbial growth.

[0020] 2. This invention uses the one-way valve of the plunger pump to make the pH value of the straw and manure mixture inside the fermentation tank uniform through the flow and stirring of the material, thereby increasing the fermentation rate. Furthermore, the flow and stirring of the material maintains the fermentation environment of the material at the pH value most suitable for the vigorous growth of microorganisms, thus avoiding acidification of the material.

[0021] 3. This invention utilizes the one-way valve of the plunger pump to ensure uniform inoculation of the straw and manure mixture with the fermentation bacteria inside the fermentation tank, thereby increasing the fermentation rate.

[0022] 4. This invention uses the one-way valve of the plunger pump to agitate the straw and manure mixture inside the fermentation tank, thus preventing phenomena such as material sticking to the walls, stratification, crusting, and scum from occurring that are detrimental to anaerobic fermentation.

[0023] 5. This invention divides the fermentation tank into three areas: a main tank, a first auxiliary tank, and a second auxiliary tank. When the straw and manure mixture enters the fermentation tank through the feed pipe, it first enters the mixing tank for mixing and stirring, and then enters the main tank and the first auxiliary tank from above the mixing tank. Inside the first auxiliary tank, it is blocked by a partition plate and enters the second auxiliary tank from top to bottom and then from bottom to top. During this period, the straw and manure mixture has accumulated fermentation through sufficient retention time, allowing it to be completely decomposed into biogas residue by the inoculum. The decomposed biogas residue then enters the second auxiliary tank through the first auxiliary tank and is discharged through the inoculum outlet pipe.

[0024] 6. This invention, from feedstock to biogas production, employs a rational process design and ingenious structural design to ensure optimal inoculation of microorganisms and fermentation retention of the materials. Ultimately, this guarantees that the overall process significantly exceeds national standards, achieving a daily biogas production rate of 5m³ per unit volume. 3 .m 3 / d, 500m³ of gas produced per ton of straw 3 Or more. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a cross-sectional side view of the entire invention;

[0027] Figure 3 This is a cross-sectional front view of the entire invention;

[0028] Figure 4 This is a top cross-sectional view of the entire invention.

[0029] In the diagram: 1. Fermentation tank; 2. Main tank; 3. Feed pipe; 4. Slag discharge pipe; 5. Biogas outlet pipe; 6. Inoculum return pipe; 7. Servo motor; 8. Rotating shaft; 9. First auxiliary tank; 10. Second auxiliary tank; 11. First auxiliary tank partition; 12. First auxiliary tank wall; 13. Second auxiliary tank wall; 14. Temperature sensor; 15. Stirring rod; 16. Conical bottom space; 17. Seasoning tank; 18. Conical bottom space of fermentation tank; 19. Positive and negative pressure protector; 20. Pressure pump. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Please see Figures 1 to 4 One embodiment provided by the present invention:

[0032] A two-phase, three-tank, simplified, high-efficiency anaerobic sequential fermentation device includes a fermentation tank 1. The fermentation tank 1 contains a first auxiliary tank 16 and a second auxiliary tank 17 arranged from the outside in. A main tank 15 is formed between the first auxiliary tank and the inner wall of the fermentation tank 1, creating a main tank and two auxiliary tanks side-by-side. The walls of the main tank 15, the first auxiliary tank 16, and the second auxiliary tank 17 are of equal height. A first auxiliary tank baffle 10 is centrally located within the first auxiliary tank. The upper edge of the first auxiliary tank baffle 10 is higher than the height of all the main and auxiliary tank walls. The bottom of the first auxiliary tank baffle 10 is perforated to form a channel. The top of the baffle (or wall) 10 is fixedly connected to the inner wall of the top of the fermentation tank 1 and is perforated at even intervals to form gas channels to maintain a balanced biogas pressure in the entire dome section. The lower part of this baffle, like the top, is perforated at even intervals to form a material flow channel.

[0033] The propulsion process utilizes gravity as its driving force, with the material flowing down from the mixing tank providing thrust. Continuous feeding and the constant influx of new material propelling the old material forward, the material surges upward from the main tank's inlet pipe, reaching the top of the tank wall before overflowing into the first auxiliary tank. This propulsion process again involves the continuous downward flow of new material from the mixing tank, pushing the old material through the perforated section at the bottom of the partition in the first auxiliary tank upwards. Once this propulsion reaches the top of the second auxiliary tank wall, it overflows into the second auxiliary tank for final anaerobic fermentation and decomposition. This orderly propulsion process allows for a sufficient retention period, enabling the material to undergo sufficient microbial decomposition, maximizing the replacement of carbon elements with combustible methane gas.

[0034] The fermentation tank 1 has twelve feed inlets at its top. Two seasoning pools 2 are fixedly installed at the top of the fermentation tank 1. Six feed pipes 3 are fixedly installed at the bottom of each seasoning pool 2. The feed pipes 3 are inserted into the interior of the fermentation tank 1 through the feed inlets. The main tank of the dome of the fermentation tank 1 is equipped with twelve plunger pump-type stirring devices. The plunger pumps push the material outward from the bottom side (clockwise or counterclockwise) through the one-way valve to generate a bottom vortex and achieve micro-stirring. This micro-stirring prevents the straw and manure mixture inside the fermentation tank 1 from settling and increases its fermentation rate. Pressure pumps 20 are fixedly installed on both sides of the center of the top of the fermentation tank 1. The pressure pumps 20 are connected through pipes (5) and inserted into the main tank of the fermentation tank at 1 / 2 of the material height. The pressure pumps provide power to pump the inoculum back into the seasoning pool.

[0035] The aforementioned micro-stirring serves two purposes: firstly, it prevents the formation of sludge-like biogas residue at the bottom of the fermenter; secondly, it ensures greater uniformity in the inoculation, temperature, pH, and concentration of the materials throughout the fermenter, resulting in consistent fermentation efficiency. Furthermore, the use of a PLC automatic control system allows for more accurate reflection of the fermenter's operational status on a large digital display screen.

[0036] The process begins by adding crop straw and manure mixed fermentation bacteria to the seasoning tank 2 at the top of fermentation tank 1, then heating it with boiler or recovered waste heat and stirring vigorously to ensure uniform inoculation and temperature. The mixture is then poured into the main tank, initiating the first flow process.

[0037] The continuous feeding during normal production creates a powerful force that propels the material upwards from the lower opening of feed pipe 3. It flows up to the upper edge of the tank wall, inevitably overflowing into the first auxiliary tank. Driven downwards by the continuous feeding, it then moves upwards again through the perforated connecting section, finally reaching the upper edge of the second auxiliary tank and overflowing into it. In this orderly flow, the material undergoes thorough fermentation and decomposition, significantly increasing gas production efficiency.

[0038] After the entire fermentation process is completed, the remaining sludge-like biogas residue that can no longer be decomposed is discharged through the sludge discharge pipe 4.

[0039] A seasoning tank 2 is installed above the inner wall of the fermentation tank 1 and the wall of the first auxiliary tank 8. The position between the wall of the first auxiliary tank 8 and the wall of the second auxiliary tank 9 is designated as the first auxiliary tank 16. The inner side of the wall of the second auxiliary tank 9 is designated as the second auxiliary tank 17. The bottom surface of the interior of the second auxiliary tank 17 is provided with a conical space bottom 18, and a slag discharge pipe 4 is fixedly installed at the bottom end of the conical space bottom 18. A biogas outlet pipe 6 is fixedly installed at the center of the top of the fermentation tank 1. On the other two sides of the center of the top of the fermentation tank 1, inoculum return pipes 5 are fixedly installed, extending through the top of the fermentation tank 1 and into the interior of the fermentation tank 1. The inner side of the partition or ring wall 8 and 9 of the first auxiliary tank is divided into three layers from top to bottom, with four temperature sensors 13, four material concentration sensors 11, and four pH sensors 12 evenly distributed. Four material height sensors 14 are installed along the upper edge of the walls of the first and second auxiliary tanks 8 and 9.

[0040] The top of the feed pipe 3 is connected to the seasoning tank 2. The feed pipe 3, the inoculum return pipe 5, and the upper edge of the perforated portion of the first auxiliary tank partition or ring wall 10 are all two meters apart from the bottom of the fermentation tank 1. The first auxiliary tank partition uses PC plastic honeycomb panels to reduce investment costs. If brick or reinforced concrete is used, the bottom is fixed to the bottom of the fermentation tank with embedded parts, and the bottom is perforated upwards to two meters to form a flow channel.

[0041] The top of fermenter 1 is equipped with a positive and negative pressure protector. When the biogas pressure inside fermenter 1 exceeds the set value, it will automatically release some pressure to a safe value. The positive and negative pressure protector refers to the automatic pressure relief when the pressure inside the tank exceeds the set value, so as to keep the fermenter operating within the set pressure range for safety.

[0042] The design principle of this invention is as follows:

[0043] The inoculum pumped back from the fermentation tank in the seasoning pool should be the most active, black, sludge-like bacteria. This is most effective when the inoculation occurs at a point half the height of the main tank material.

[0044] Two 60m³ seasoning tanks are installed on the top of the tank. 3 ×2. Each seasoning is connected to 6 feed inlets. Due to gravity, the material, which has a certain degree of fluidity, is continuously fed from top to bottom, and then flows out from the feed inlet at the bottom of the main tank and moves upward. It overflows into the first auxiliary tank 16 when it reaches the height of the first auxiliary tank wall.

[0045] Furthermore, due to the continuous feeding during large-scale production, the amount of overflowing material increases continuously. It moves from the bottom of the perforated partition of the first auxiliary tank to the other side of the perforated partition and continues upward until it reaches the height of the second auxiliary tank wall, where it overflows into the second auxiliary tank and enters the final decomposition, fermentation, and retention stage, thereby maximizing gas production.

[0046] The temperature and pH value of the material are the most important operating data for anaerobic fermentation. In order to keep track of the changes in operation in a timely manner, three layers of temperature and pH value sensors are installed in the main tank to realize online monitoring and display on the large screen in the central control room.

[0047] Similarly, the first and second auxiliary tanks are also equipped with multi-layer, multi-point sensors. During the startup phase, the entire project has a relatively long startup period, approximately 40-50 days from heating to normal gas production. Initially, about 2000 tons of inoculum are added to the main tank. Inoculum is then drawn back from the main tank from the conditioning tank. The process continues until the daily gas production rate reaches 3m³ / s. 3 ·m 3 After / d, once the first and second auxiliary pools are fully loaded, the inoculated bacteria are pumped back from 1 / 2 of the main pool into the seasoning pool.

[0048] After the above startup process, it enters normal gas production operation.

[0049] The specific design specifications of fermentation tank 1, first auxiliary tank 16, and second auxiliary tank 17 are as follows:

[0050] The single-unit above-ground fermentation tank has a capacity of 10,000 cubic meters, a diameter of 29 meters (based on the previously designed footprint), and a height of 17 meters. The main tank has a capacity of 2,680 cubic meters (to shorten the initial fermentation retention period). The first auxiliary tank has a wall diameter of 24 meters, with a full-load effective volume of approximately 5,370 cubic meters. A partition divides it in two (equivalent to two 2,680 cubic meter tanks). The bottom is suspended approximately 2 meters above the ground, with a height of 17 meters. The second auxiliary tank has a diameter of 13 meters and a full-load effective volume of 1,921 cubic meters. (All data are from the same center). The conical bottom has a volume of approximately 45 cubic meters. Two 60-cubic-meter seasoning pools are located at the top of the tank. Twelve feed inlets allow for top-down feeding, relying on the downward pushing force of the feed: feed from the main tank at the top > feed from the bottom to the top > feed from the first auxiliary tank > feed downwards > feed upwards > feed into the second auxiliary tank > slag discharge at the bottom. This completes the entire flow fermentation process. This design is based on the principle of continuous feeding and orderly fermentation required for large-scale production. The original daily gas production rate per unit volume was 3 m³. 3 ·m 3 Based on the data of / d and 500 cubic meters of gas production per ton of straw, the aim is to maximize the complete decomposition of the straw and manure mixture, ultimately achieving a daily gas production rate of 5m³ per unit volume. 3 ·m 3 The goal is to produce more than 500 cubic meters of gas per ton of straw per day.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A two-phase, three-tank, simplified plug-flow, high-efficiency anaerobic sequential fermentation device, comprising a fermentation tank (1), characterized in that: The fermentation tank (1) is provided with a first auxiliary tank (16) and a second auxiliary tank (17) arranged from the outside to the inside. The first auxiliary tank and the inner wall of the fermentation tank (1) form a main tank (15), forming a main tank and two auxiliary tanks. The walls of the main tank (15), the first auxiliary tank (16), and the second auxiliary tank (17) are of the same height. A first auxiliary tank partition (10) is added in the center of the first auxiliary tank. The upper edge of the first auxiliary tank partition (10) is higher than the height of all the main and auxiliary tank walls. The top is hollowed out to form a gas channel. The bottom of the first auxiliary tank partition (10) is hollowed out to form a material push channel. The fermentation tank (1) has multiple feed inlets at its top. Two seasoning pools (2) are fixedly installed at the top of the fermentation tank (1). Multiple feed pipes (3) are fixedly installed at the bottom of each seasoning pool (2). The feed pipes (3) are inserted into the interior of the fermentation tank (1) through the feed inlets. The two seasoning pools are respectively equipped with microbial return pipes. Pressure pumps (20) are fixedly installed on both sides of the center of the top of the fermentation tank (1). The pressure pumps (20) are connected to and inserted into the main tank of the fermentation tank at 1 / 2 of the material height through pipes (5). The pressure pumps provide power to realize the return of microbial culture into the seasoning pool. Multiple plunger-type material stirring devices (7) are installed at the top of the fermentation tank (1) along the edge of the main tank. The stirring devices are inserted into the bottom of the fermentation tank through pipes. The plunger pump uses a one-way valve to generate reciprocating motion to achieve one-way bottom outflow of material, thereby driving the micro-stirring of the material at the bottom of the fermentation tank.

2. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: A first auxiliary pool wall (8) is fixedly installed on the outer side of the inside of the fermentation tank (1), and a second auxiliary pool wall (9) is fixedly installed on the inner side of the inside of the fermentation tank (1). A first auxiliary pool partition (10) is fixedly installed between the first auxiliary pool wall (8) and the second auxiliary pool wall (9). The top of the first auxiliary pool partition (10) is fixedly connected to the inner wall of the top of the fermentation tank (1) and is hollowed out. The bottom of the first auxiliary pool partition (10) is hollowed out.

3. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: A seasoning tank (2) is installed above the inner wall of the fermentation tank (1) and the wall of the first auxiliary tank (8). The position between the wall of the first auxiliary tank (8) and the wall of the second auxiliary tank (9) is designated as the first auxiliary tank (16). The inner side of the wall of the second auxiliary tank (9) is designated as the second auxiliary tank (17). The bottom surface of the second auxiliary tank (17) is provided with a conical space bottom (18). A slag discharge pipe (4) is fixedly installed at the bottom end of the conical space bottom (18).

4. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: A biogas outlet pipe (6) is fixedly installed at the center of the top of the fermentation tank (1). On the other two sides of the center of the top of the fermentation tank (1), microbial inoculum return pipes (5) are fixedly installed. The microbial inoculum return pipes (5) extend through the top of the fermentation tank (1) and into the interior of the fermentation tank (1).

5. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: The inner sides of the first auxiliary pool wall (8) and the second auxiliary pool wall (9) are divided into three levels from top to bottom. Temperature sensor (13), material concentration sensor (11) and pH value sensor (12) are respectively provided at each level position on the inner and outer surfaces of the first auxiliary pool wall (8) and the second auxiliary pool wall (9). Material height sensor (14) is provided at the top of the first auxiliary pool wall (8) and the second auxiliary pool wall (9).

6. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: The fermentation tank (1) is equipped with a positive and negative pressure protector (19) on its top.

7. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: Twelve plunger-type material stirring devices (7) are installed along the edge of the main tank at the position where the feed pipe (3) contacts the main tank (15). The stirring device (7) is inserted into the bottom of the fermentation tank through a pipe and opens to the side in the same direction. The plunger pump uses a one-way valve to generate reciprocating motion to realize the material flowing out to the bottom in one direction, thereby driving the micro-stirring of the material at the bottom of the fermentation tank.

8. The two-phase three-tank simplified plug-flow high-efficiency anaerobic sequential fermentation device according to claim 1, characterized in that: The seasoning pool wall panel at the top of the fermentation tank (1) is configured as a sandwich layer, and a heat exchange circulation pipeline for waste heat recovery is installed inside.

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