Pure straw anaerobic fermentation equipment and method with high volume gas production rate

Abstract

The invention discloses pure straw anaerobic fermentation equipment and a pure straw anaerobic fermentation method with high volume gas production rate, and relates to the technical field of anaerobic fermentation. The equipment comprises a stirrer, the stirrer is communicated with a feeding pump, the feeding pump is communicated with a tank-type feeding and discharging device through a circulating material inlet pipe and a plurality of feeding pipes, the tank-type feeding and discharging device is communicated with a biogas fermentation tank through a discharging pipe and a plurality of feeding pipes, and the tank-type feeding and discharging device is further communicated with a water-ring vacuum pump and a gas filling tank. The gas filling tank is communicated with an air compressor unit; the biogas fermentation tank is communicated with the stirrer through a plurality of circulating material pipes; the biogas fermentation tank comprises a tank body, a tank cover is detachably connected to the tank body, the tank body is divided into an outer ring tank and an inner ring tank, the outer ring tank is communicated with the inner ring tank, the outer ring tank is communicated with the tank-type feeding and discharging device through a plurality of feeding pipes, the inner ring tank is communicated with the tank-type feeding and discharging device through a discharging pipe, and the inner ring tank is communicated with the stirrer through a plurality of circulating material pipes. The limitation of a feeding and discharging system is solved, and the material volume gas production rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of anaerobic fermentation, and in particular to pure straw high volume gas production rate anaerobic fermentation equipment and method. Background Art

[0002] If the large amount of agricultural waste (such as corn stalks, rice straw, etc.) generated worldwide every year cannot be effectively utilized, it will not only cause a waste of resources, but may also cause environmental pollution problems. Traditional straw treatment methods, such as incineration and composting, have problems such as environmental pollution and low resource utilization. Anaerobic fermentation technology provides an environmentally friendly and economical solution for the efficient utilization of straw. Existing anaerobic fermentation equipment and processes face problems such as easy floating of straw and low gas production efficiency when processing pure straw, which limits its potential for commercial application. The structure of straw is complex and contains a large amount of cellulose, hemicellulose and lignin. These components are difficult to be directly degraded by microorganisms and require process adjustments. Therefore, it is very necessary to develop a high-concentration anaerobic fermentation process for straw treatment to solve the limitations of the feed and discharge system, reduce the frequency of equipment maintenance, and increase the volumetric gas production rate of materials. Summary of the invention

[0003] The purpose of the present invention is to provide a pure straw high volumetric gas production rate anaerobic fermentation equipment and method, which can solve the limitation of the feeding and discharging system, reduce the equipment maintenance frequency, and improve the material volumetric gas production rate.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A pure straw high volumetric gas production rate anaerobic fermentation equipment, the equipment comprises a mixer, the mixer is connected with a feeding pump, the feeding pump is connected with a tank-type feeder and a plurality of feeding pipes through a circulating material feed pipe, the tank-type feeder and a plurality of feeding pipes are respectively connected with a biogas fermentation tank through a discharge pipe and a plurality of feeding pipes, the tank-type feeder and a plurality of feeding pipes are also respectively connected with a water ring vacuum pump and an air filling tank, the air filling tank is connected with an air compressor unit, the biogas fermentation tank is connected with the mixer through a plurality of circulating material pipes;

[0006] The biogas fermentation tank includes a tank body, to which a tank cover is detachably connected, and the tank body is divided into an outer ring tank and an inner ring tank, the outer ring tank is connected to the inner ring tank, the outer ring tank is connected to the tank-type feeder and discharger through a plurality of feed pipes, the inner ring tank is connected to the tank-type feeder and discharger through the discharge pipe, and the inner ring tank is connected to the mixer through a plurality of circulating feed pipes.

[0007] Optionally, a hole is opened on the tank cover, and an S flat glass sight glass is installed on the hole; and an LD radar material meter is installed on the tank cover.

[0008] Optionally, any of the feeding pipes is respectively connected to a pipeline glass tube sight glass, and the pipeline glass tube sight glass is connected to the feeding pump.

[0009] Optionally, a buffered flexible connection is provided between the feeding pump and the pipeline glass tube sight glass.

[0010] Optionally, a first DQ electric ball valve is installed between the water ring vacuum pump and the tank type feeder and discharger; a second DQ electric ball valve is installed between the tank type feeder and discharger and the air filling tank; and a third DQ electric ball valve is installed between the air filling tank and the air compressor unit.

[0011] Optionally, a first DZ electric gate valve is installed on the discharge pipe; a second DZ electric gate valve is installed on each of the feeding pipes; a third DZ electric gate valve is installed on each of the circulating material pipes; a fourth DZ electric gate valve is installed between the mixer and the feeding pump; and a seventh DZ electric gate valve is installed on the circulating material inlet pipe.

[0012] Optionally, a fifth DZ electric gate valve is installed between the feeding pump and the pipeline glass tube sight glass.

[0013] Optionally, a sixth DZ electric gate valve is installed at the connection port between the circulating material pipe and the mixer.

[0014] Optionally, the air compressor unit is a screw air compressor unit.

[0015] To achieve the above object, the present invention also provides the following solution:

[0016] A pure straw high volume gas production rate anaerobic fermentation method, the method is applied to the above-mentioned pure straw high volume gas production rate anaerobic fermentation equipment, the method comprising:

[0017] S1, feeding at the time of production, the material enters the mixer, and is transported to the biogas fermentation tank through the feeding pump. The material first enters the outer ring tank through the feeding pipeline, and overflows into the central inner ring tank when the outer ring tank is full;

[0018] S2, discharging, stop feeding, close the valve between the gas filling tank and the tank-type feeder and discharger, the valve of the circulating material pipe into the mixer, and the valve on the circulating material inlet pipe, turn on the water ring vacuum pump, and transport the material in the inner ring tank to the tank-type feeder and discharger by pumping negative pressure and coordinating with gravity conveying;

[0019] S3, during normal production, the material is circulated and fed. After the material is discharged, the material level in the inner ring tank is reduced, the outer ring tank overflows into the inner ring tank, and the material level in the outer ring tank is reduced to the height of the top of the inner ring tank. The material is replenished and the valve between the gas filling tank and the tank feeder and discharger is opened;

[0020] S4, stop feeding, close the valve between the gas filling tank and the tank-type feeder and discharger, and the valve of the circulating material pipe into the mixer, open the valve on the circulating material pipe, the valve on the discharge pipe, and the valve between the water ring vacuum pump and the tank-type feeder and discharger, turn on the vacuum pump, and transport the material in the outer ring tank to the tank-type feeder and discharger;

[0021] S5, close the valve on the circulating material inlet pipe, the valve on the discharge pipe, the valve between the water ring vacuum pump and the tank type feeder and discharger, open the valve between the air filling tank and the tank type feeder and discharger, and the valve of the circulating material pipe entering the mixer, turn on the air compressor, and pump the material in the tank type feeder and discharger into the mixer. After mixing it evenly with the newly added straw material, open the valve on the circulating material pipe, turn on the feed pump, and transport the new and old mixed materials to the biogas fermentation tank. The material first enters the outer ring tank, and then overflows into the inner ring tank to replenish the material level.

[0022] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0023] The present invention isolates the material into two areas by adding an inner tank structure and adopts an overflow-circulation system, so that the main reactions of anaerobic fermentation are concentrated in the hydrogen production and acetic acid production stages, while the inner ring tank area maintains a relatively stable environment, creating more suitable living conditions for methanogens; the anaerobic reaction is dominated by the methanogenic reaction, which significantly improves the gas production efficiency and volumetric gas production rate.

[0024] The feed pipe transports the material upward through the inner ring tank to the outer ring tank, realizing the effective recovery and utilization of the heat released by the fermentation reaction; it not only plays the role of preheating the material and improving the energy utilization efficiency, but also significantly improves the reaction efficiency; in this way, the system can more effectively utilize the heat generated internally to provide preheating for the incoming material, thereby enhancing the efficiency of the entire anaerobic fermentation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the biogas fermentation tank structure;

[0028] Figure 3 It is a schematic diagram of the partial structure of the biogas fermentation tank;

[0029] Figure 4It is a schematic diagram of the layout structure of the present invention;

[0030] Figure 5 It is a schematic diagram of the process of the present invention.

[0031] Explanation of symbols:

[0032] 1. Mixer; 2. Feeding pump; 3. Tank feeder and discharger; 4. Water ring vacuum pump; 5. Gas filling tank; 6. Air compressor unit; 7. Discharge pipe; 8. Feed pipe; 9. Circulation pipe; 10. Feeding pipe; 11. Biogas fermentation tank; 1101. Outer ring tank; 1102. Tank cover; 1103. Inner ring tank; 12. First DQ electric ball valve; 13. Second DQ electric ball valve; 14. Third DQ electric ball valve; 15. First DZ electric gate valve; 16. Second DZ electric gate valve; 17. Third DZ electric gate valve; 18. Fourth DZ electric gate valve; 19. Fifth DZ electric gate valve; 20. Sixth DZ electric gate valve; 21. Seventh DZ electric gate valve; 22. Circulation material inlet pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a pure straw high volumetric gas production rate anaerobic fermentation equipment and method, which can solve the limitation of the feeding and discharging system, reduce the equipment maintenance frequency, and improve the material volumetric gas production rate.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention discloses a pure straw high volumetric gas production rate anaerobic fermentation equipment, the equipment includes a mixer 1, the mixer 1 is connected with a feeding pump 2, the feeding pump 2 is connected with a tank-type feeder 3 through a circulating material feed pipe 22 and a plurality of feeding pipes 10, the tank-type feeder 3 is connected with a biogas fermentation tank 11 through a discharge pipe 7 and a plurality of feed pipes 8, the tank-type feeder 3 is also connected with a water ring vacuum pump 4 and an air filling tank 5, the air filling tank 5 is connected with an air compressor unit 6, and the biogas fermentation tank 11 is connected with the mixer 1 through a plurality of circulating material pipes 9;

[0037] The biogas fermentation tank 11 includes a tank body, to which a tank cover 1102 is detachably connected. The tank body is divided into an outer ring tank 1101 and an inner ring tank 1103. The outer ring tank 1101 is connected to the inner ring tank 1103. The outer ring tank 1101 is connected to the tank-type feeder and discharger 3 through a plurality of feed pipes 8. The inner ring tank 1103 is connected to the tank-type feeder and discharger 3 through the discharge pipe 7. The inner ring tank 1103 is connected to the mixer 1 through a plurality of circulation pipes 9.

[0038] The present invention realizes the rapid and uniform stirring and circulating feeding of straw raw materials through the synergistic effect of the mixer 1, the feeding pump 2, the circulating material inlet pipe 22 and the tank-type feeder and discharger 3, effectively improves the distribution uniformity of straw in the biogas fermentation tank 11, promotes the full contact between microorganisms and straw, and thus significantly improves the biogas production and volumetric gas production rate. By designing a double-layer structure with an outer ring tank 1101 and an inner ring tank 1103, and then through different feeding and discharging paths, the material flow control during the fermentation process is realized, which helps to maintain the appropriate temperature, humidity and pH value in the tank, and provides a more stable and efficient fermentation environment for anaerobic microorganisms. The tank-type feeder and discharger 3 is used in conjunction with the water ring vacuum pump 4 and the gas filling tank 5, which can not only adjust the pressure and gas composition in the fermentation tank as needed, but also can efficiently and quickly discharge the biogas residue and biogas liquid after the fermentation is completed, reducing the difficulty and cost of subsequent treatment. The various components of the equipment adopt a modular design, which is easy to disassemble, clean and maintain, reduces the failure rate and long-term operating cost of the equipment, and improves the reliability and service life of the overall system.

[0039] like Figure 4 As shown, a hole is opened on the tank cover 1102, and an S flat glass sight glass is installed on the hole; an LD radar material meter is installed on the tank cover 1102.

[0040] The installation of the S flat glass sight glass allows the operator to visually observe the material status inside the biogas fermentation tank 11, including the liquid level, color, turbidity, etc. of the material, which provides an important basis for judging the fermentation process and timely adjusting the fermentation conditions. The use of the LD radar material meter can measure the actual liquid level of the material in the fermentation tank in a non-contact manner. Compared with the traditional measurement method, it has higher accuracy and stability, and reduces the measurement error caused by factors such as material accumulation and bubble interference. Through the combined use of the S flat glass sight glass and the radar material meter, the operator can grasp the situation inside the tank in real time without directly contacting the material inside the fermentation tank, effectively avoiding safety hazards caused by misoperation or material characteristics. Accurate material monitoring data helps to achieve refined management of the fermentation process, including optimization of material delivery, stirring frequency, fermentation time, etc., thereby further improving biogas production and fermentation efficiency.

[0041] Optionally, any of the feeding pipes 10 is respectively connected to a pipeline glass tube sight glass, and the pipeline glass tube sight glass is connected to the feeding pump 2.

[0042] The installation of the pipeline glass tube sight glass allows the operator to intuitively observe the flow state of the material in the feeding pipe 10, including the type of material, flow rate, flow rate and whether there is blockage or leakage. This helps to find and solve problems in time to ensure the smooth progress of the fermentation process. By observing the flow of materials through the sight glass, safety hazards caused by material accumulation, blockage or leakage can be avoided. The operator can adjust the speed and flow of the feeding pump 2 in time according to the material flow observed in the sight glass, thereby optimizing the material delivery efficiency and reducing energy waste and material loss.

[0043] Preferably, a buffered soft connection is provided between the feeding pump 2 and the pipeline glass tube sight glass.

[0044] The buffer soft connection can effectively absorb and disperse the vibration generated during the operation of the feeding pump 2, reduce the impact of the vibration on the feeding pipe 10 and the glass tube sight glass of the pipeline, thereby extending the service life of the equipment; at the same time, it can also reduce the noise pollution caused by vibration and provide a more comfortable working environment for operators. Since the feeding pump 2 may generate a certain impact force during operation, the buffer soft connection can absorb these impact forces and prevent the glass tube sight glass of the pipeline from breaking due to excessive force, thereby avoiding safety hazards caused by material leakage. The buffer soft connection has a certain elasticity and can adapt to the slight deformation of the pipeline caused by temperature changes, material flow and other factors, ensuring the stability and reliability of the pipeline system; in addition, it can also be easily installed and disassembled, which is convenient for equipment maintenance and overhaul. The design of the buffer soft connection can reduce the pressure fluctuation and fluid resistance in the pipeline system, allowing the material to flow more smoothly in the feeding pipe 10 and improve the feeding efficiency.

[0045] Preferably, a first DQ electric ball valve 12 is installed between the water ring vacuum pump 4 and the tank type feeder and discharger 3; a second DQ electric ball valve 13 is installed between the tank type feeder and discharger 3 and the air filling tank 5; and a third DQ electric ball valve 14 is installed between the air filling tank 5 and the air compressor unit 6.

[0046] The installation of the first DQ electric ball valve 12, the second DQ electric ball valve 13 and the third DQ electric ball valve 14 enables the flow of materials and gases between the water ring vacuum pump 4, the tank feeder 3, the gas filling tank 5 and the air compressor unit 6 to be precisely controlled, which helps to optimize the material circulation and gas regulation during the fermentation process and improve the operating efficiency and stability of the overall system. The DQ electric ball valve has the characteristics of rapid response and reliable closure, and can quickly cut off the flow of materials or gases in an emergency to prevent accidental leakage or accidents, improve the safety of the system, and ensure the life safety of operators and the stable operation of the equipment. The DQ electric ball valve has a compact structure, simple operation, and is easy to maintain and replace; when the valve fails, it can be quickly located and repaired, reducing downtime and production losses caused by equipment failure. By precisely controlling the flow of materials and gases, unnecessary energy waste and environmental pollution can be reduced; for example, by installing the first DQ electric ball valve 12 between the water ring vacuum pump 4 and the gas filling tank 5, the valve can be closed in time when vacuuming is not required to avoid ineffective consumption of energy.

[0047] Preferably, a first DZ electric gate valve 15 is installed on the discharge pipe 7; a second DZ electric gate valve 16 is installed on each of the feeding pipes 10; a third DZ electric gate valve 17 is installed on each of the circulating material pipes 9; a fourth DZ electric gate valve 18 is installed between the mixer 1 and the feeding pump 2; and a seventh DZ electric gate valve 21 is installed on the circulating material inlet pipe 22.

[0048] Through the precise opening and closing of the first DZ electric gate valve 15, the second DZ electric gate valve 16, the third DZ electric gate valve 17, the fourth DZ electric gate valve 18 and the seventh DZ electric gate valve 21, the flow path and flow rate of the material in the biogas fermentation system can be flexibly controlled to ensure that the material is distributed to each fermentation link as needed, thereby improving the fermentation efficiency. The introduction of electric valves enables the entire biogas fermentation system to be remotely controlled and automatically managed through automation equipment such as PLC (programmable logic controller), reducing manual operation costs and improving production efficiency. Electric valves are usually equipped with a state feedback function that can monitor the opening and closing state of the valve in real time. Once an abnormality is found, an early warning signal can be immediately issued, which is convenient for timely detection and handling of potential faults and reducing system downtime.

[0049] Furthermore, a fifth DZ electric gate valve 19 is installed between the feeding pump 2 and the pipeline glass tube sight glass.

[0050] By using the pipeline glass tube sight glass in combination with the fifth DZ electric gate valve 19, the operator can intuitively observe the flow state of the material in the pipeline, and combined with the switching state of the electric gate valve, realize visual management of the equipment and improve operating efficiency and accuracy.

[0051] Optionally, a sixth DZ electric gate valve 20 is installed at the connection port between the circulating material pipe 9 and the mixer 1 .

[0052] The addition of the sixth DZ electric gate valve 20 allows the operator to accurately control the material flow rate from the circulating material pipe 9 into the mixer 1, which helps to maintain the stable state of the material in the mixer 1 and ensure that the material is evenly mixed, thereby improving the efficiency of anaerobic fermentation. Through the switch state of the sixth DZ electric gate valve 20, the operator can flexibly adjust the flow path of the circulating material and realize the diversified flow pattern of the material in the system, which helps to optimize the fermentation process and improve the biogas production and quality. In an emergency, such as when the mixer 1 fails or needs to be shut down for maintenance, the operator can quickly close the sixth DZ electric gate valve 20 to cut off the flow of the circulating material, thereby avoiding safety hazards such as material leakage or abnormal system pressure. The design of the sixth DZ electric gate valve 20 makes the connection between the mixer 1 and the circulating material pipe 9 easier to disassemble and replace. When the mixer 1 or the circulating material pipe 9 needs to be maintained or repaired, the operator can easily close the sixth DZ electric gate valve 20 to isolate the relevant components and reduce downtime and maintenance costs.

[0053] Optimizing energy consumption: By accurately controlling the flow rate of the circulating material, unnecessary energy consumption can be avoided. For example, after the materials are mixed evenly, the flow rate of the circulating material can be appropriately reduced, thereby reducing the energy consumption of the mixer 1.

[0054] Preferably, the air compressor unit 6 is a screw air compressor unit 6 .

[0055] The screw air compressor unit 6 provides a stable air source for the equipment with its high efficiency, stability and low noise, while reducing energy consumption and improving the energy efficiency of the overall equipment. The screw air compressor unit 6 has a simple structure, convenient maintenance, and stable operation, which reduces downtime caused by equipment failure and reduces maintenance costs. The combination of the sixth DZ electric gate valve 20 and the screw air compressor unit 6 allows the system to flexibly adjust the material circulation speed and gas pressure according to actual fermentation needs, creating optimal conditions for the anaerobic fermentation process.

[0056] like Figure 5 As shown, the present invention discloses a method for anaerobic fermentation of pure straw with high volumetric gas production rate; the method is applied to the above-mentioned anaerobic fermentation equipment of pure straw with high volumetric gas production rate, and the method comprises:

[0057] S1, feeding when put into production, the material enters the mixer 1, and is transported to the biogas fermentation tank 11 through the feeding pump 2. The material first enters the outer ring tank 1101 through the feeding pipe 8, and when the outer ring tank 1101 is full, it overflows into the central inner ring tank 1103.

[0058] S2, discharging, stop feeding, close the valve between the air filling tank 5 and the tank type feeder and discharger 3, the valve between the circulating material pipe 9 and the mixer 1, and the valve on the circulating material inlet pipe 22, open the water ring vacuum pump 4, and transport the material in the inner ring tank 1103 to the tank type feeder and discharger 3 by pumping negative pressure and coordinating with gravity transportation.

[0059] S3, during normal production, the feed is circulated, and after discharge, the material level in the inner ring tank 1103 is lowered, and the outer ring tank 1101 overflows into the inner ring tank 1103. The material level in the outer ring tank 1101 is lowered to the height position of the top of the inner ring tank 1103, and the feed is supplemented, and the valve between the gas filling tank 5 and the tank-type feeder and discharger 3 is opened.

[0060] S4, stop feeding, close the valve between the gas filling tank 5 and the tank type feeder and discharger 3, and the valve between the circulating material pipe 9 and the mixer 1, open the valve on the circulating material pipe 9, the valve on the discharge pipe 7, and the valve between the water ring vacuum pump 4 and the tank type feeder and discharger 3, turn on the vacuum pump, and transport the material in the outer ring tank 1101 to the tank type feeder and discharger 3.

[0061] S5, close the valve on the circulating material inlet pipe 22, the valve on the discharge pipe 7, and the valve between the water ring vacuum pump 4 and the tank type feeder and discharger 3, open the valve between the air filling tank 5 and the tank type feeder and discharger 3, and the valve between the circulating material pipe 9 and the mixer 1, start the air compressor, and pump the material in the tank type feeder and discharger 3 into the mixer 1. After mixing evenly with the newly added straw material, open the valve on the circulating material pipe 9, turn on the feed pump, and transport the new and old mixed materials to the biogas fermentation tank 11. The material first enters the outer ring tank 1101, and then enters the inner ring tank 1103 through overflow to replenish the material level.

[0062] The method disclosed in the present invention enables pure straw to be fully utilized in the anaerobic fermentation process through precise material control and recycling, thereby improving the conversion efficiency of straw resources and the biogas production. By controlling the feeding and discharging and the circulation process in stages, the appropriate concentration and distribution of materials in the biogas fermentation tank 11 are maintained, which is conducive to the growth and metabolism of microorganisms, thereby improving the fermentation efficiency and biogas quality. By precisely controlling the feeding and discharging and the circulation process, material waste and energy consumption are reduced, and the production of biogas, a clean energy source, is achieved, which helps to reduce carbon emissions and environmental pollution. Through reasonable valve control and material circulation, various parts of the equipment are fully utilized, and the overall utilization rate and operating efficiency of the equipment are improved.

[0063] The present invention isolates the material into two areas by adding an inner tank structure and adopts an overflow-circulation system, so that the main reactions of anaerobic fermentation are concentrated in the hydrogen production and acetic acid production stages, while the inner ring tank 1103 area maintains a relatively stable environment, creating more suitable living conditions for methanogens; the anaerobic reaction is dominated by methanogenesis, which significantly improves the gas production efficiency and volumetric gas production rate.

[0064] The feed pipe 8 is transported upward to the outer ring tank 1101 through the inner ring tank 1103, thereby realizing the effective recovery and utilization of the heat released by the fermentation reaction; it not only plays the role of preheating the materials and improving the energy utilization efficiency, but also significantly improves the reaction efficiency; in this way, the system can more effectively utilize the heat generated internally to provide preheating for the incoming materials, thereby enhancing the efficiency of the entire anaerobic fermentation process.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A pure straw high volume gas production rate anaerobic fermentation equipment, characterized in that: The device comprises a mixer (1), the mixer (1) is connected to a feeding pump (2), the feeding pump (2) is connected to a tank-type feeder (3) through a circulating material feed pipe (22) and a plurality of feeding pipes (10), the tank-type feeder (3) is connected to a biogas fermentation tank (11) through a discharge pipe (7) and a plurality of feed pipes (8), the tank-type feeder (3) is also connected to a water ring vacuum pump (4) and an air filling tank (5), the air filling tank (5) is connected to an air compressor unit (6), the biogas fermentation tank (11) is connected to the mixer (1) through a plurality of circulating material pipes (9); The biogas fermentation tank (11) comprises a tank body, to which a tank cover (1102) is detachably connected, and the tank body is divided into an outer ring tank (1101) and an inner ring tank (1103), the outer ring tank (1101) is connected to the inner ring tank (1103), the outer ring tank (1101) is connected to the tank-type feeder and discharger (3) via a plurality of feed pipes (8), the inner ring tank (1103) is connected to the tank-type feeder and discharger (3) via the discharge pipe (7), and the inner ring tank (1103) is connected to the mixer (1) via a plurality of circulation pipes (9).

2. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 1, characterized in that: The tank cover (1102) is provided with a hole, and an S-type flat glass sight glass is adapted to be installed in the hole; and an LD radar material meter is installed on the tank cover (1102).

3. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 1, characterized in that: Any of the feeding pipes (10) is connected to a pipeline glass tube sight glass, and the pipeline glass tube sight glass is connected to the feeding pump (2).

4. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 3, characterized in that: The feeding pump (2) and the pipeline glass tube sight glass are connected in a buffered flexible manner.

5. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 1, characterized in that: A first DQ electric ball valve (12) is installed between the water ring vacuum pump (4) and the tank-type feeder and discharger (3); a second DQ electric ball valve (13) is installed between the tank-type feeder and discharger (3) and the gas filling tank (5); and a third DQ electric ball valve (14) is installed between the gas filling tank (5) and the air compressor unit (6).

6. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 1, characterized in that: The discharge pipe (7) is provided with a first DZ electric gate valve (15); each of the feed pipes (10) is provided with a second DZ electric gate valve (16); each of the circulating material pipes (9) is provided with a third DZ electric gate valve (17); a fourth DZ electric gate valve (18) is provided between the mixer (1) and the feed pump (2); and a seventh DZ electric gate valve (21) is provided on the circulating material inlet pipe (22).

7. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 4, characterized in that: A fifth DZ electric gate valve (19) is installed between the feeding pump (2) and the pipeline glass tube sight glass.

8. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 1, characterized in that: A sixth DZ electric gate valve (20) is installed at the connection port between the circulating material pipe (9) and the mixer (1).

9. The pure straw high volume gas production rate anaerobic fermentation equipment according to claim 1, characterized in that: The air compressor unit (6) is a screw air compressor unit (6).

10. A pure straw high volume gas production rate anaerobic fermentation method, characterized in that: The method is applied to the pure straw high volume gas production rate anaerobic fermentation equipment according to any one of claims 1 to 9, and the method comprises: S1, feeding when put into production, the material enters the mixer (1), and is transported to the biogas fermentation tank (11) through the feeding pump (2). The material first enters the outer ring tank (1101) through the feeding pipe (8), and then overflows into the central inner ring tank (1103) when the outer ring tank (1101) is full; S2, discharging, stopping feeding, closing the valve between the gas filling tank (5) and the tank-type feeder and discharger (3), the valve of the circulating material pipe (9) entering the mixer (1), and the valve on the circulating material inlet pipe (22), and opening the water ring vacuum pump (4), and conveying the material in the inner ring tank (1103) to the tank-type feeder and discharger (3) by pumping negative pressure and coordinating gravity conveying; S3, during normal production, the material is circulated and fed. After the material is discharged, the material level in the inner ring tank (1103) is reduced, the outer ring tank (1101) overflows into the inner ring tank (1103), the material level in the outer ring tank (1101) is reduced to the height position of the top of the inner ring tank (1103), the material is replenished, and the valve between the gas filling tank (5) and the tank-type feeder and discharger (3) is opened; S4, stop feeding, close the valve between the gas filling tank (5) and the tank-type feeder and discharger (3), and the valve of the circulating material pipe (9) entering the mixer (1), open the valve on the circulating material pipe (9), the valve on the discharge pipe (7), and the valve between the water ring vacuum pump (4) and the tank-type feeder and discharger (3), turn on the vacuum pump, and transport the material in the outer ring tank (1101) to the tank-type feeder and discharger (3); S5, close the valve on the circulating material inlet pipe (22), the valve on the discharge pipe (7), and the valve between the water ring vacuum pump (4) and the tank type feeder (3), open the valve between the air filling tank (5) and the tank type feeder (3), and the valve of the circulating material pipe (9) entering the mixer (1), start the air compressor, and pump the material in the tank type feeder (3) into the mixer (1), and after mixing it evenly with the newly added straw material, open the valve on the circulating material pipe (9), turn on the feed pump, and convey the new and old mixed materials to the biogas fermentation tank (11), the materials first enter the outer ring tank (1101), and then enter the inner ring tank (1103) through overflow to replenish the material level.

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