Simple biogas dry gas holder complete equipment and control method thereof

Abstract

The present application relates to the technical field of biogas storage, and particularly relates to a simple biogas dry gas holder complete equipment and a control method thereof, which comprises an equipment foundation, an outer steel tank body and an inner membrane fixedly arranged on the equipment foundation, an inlet and outlet gas pipeline and a condenser; the inner membrane is arranged in the outer steel tank body; a through hole is arranged on the equipment foundation, and an opening is arranged on the inner membrane; the inlet and outlet gas pipeline penetrates through the through hole and is in communication with the inner membrane through the opening; the condenser is arranged on the equipment foundation and is sleeved on the inlet and outlet gas pipeline; the complete equipment further comprises a counterweight system; the counterweight system comprises an inner counterweight plate, a counterweight support frame, an outer counterweight block pulley block and an outer counterweight block. The complete equipment can adjust the counterweight of the outer counterweight block, so that the inner membrane can intake gas at a constant pressure and exhaust gas at a constant pressure; and the problems that the biogas flow is unstable and the subsequent unit cannot normally use gas in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of biogas storage technology, and in particular to a simple complete set of dry biogas holder equipment and its control method. Background Technology

[0002] With industrialization and urbanization, the types and quantities of sewage are constantly increasing, posing a significant threat to the environment and human health. Therefore, how to effectively treat this sewage has become a major concern. Traditional sewage treatment technologies mainly include physical, chemical, and biological treatment methods. Biological treatment utilizes the metabolic activity of microorganisms to transform dissolved and colloidal organic pollutants in wastewater into harmless substances, thus achieving purification. Depending on the microorganisms involved, biological treatment can be further divided into aerobic and anaerobic biological treatment. While aerobic biological treatment can treat various types of sewage, it requires large amounts of oxygen, resulting in high energy consumption and operating costs. Anaerobic biological treatment, under anaerobic conditions, involves facultative anaerobic and anaerobic microbial communities converting organic matter into methane and carbon dioxide. It is primarily used to treat high-concentration organic wastewater and sludge. Anaerobic biological treatment also offers advantages such as no need for stirring or oxygen supply, low power consumption, the production of large amounts of methane-containing biogas for power generation or household gas use, and the ability to handle high-concentration influent while maintaining high sludge concentrations. Therefore, high-concentration wastewater from existing industries such as petrochemicals, brewing, papermaking, and food processing is usually treated using anaerobic processes.

[0003] Although anaerobic biological treatment processes can convert organic matter into biogas through microbial action during operation, which can be used as fuel for plant incinerators or household gas, the biogas flow rate produced by anaerobic processes is unstable and cannot be directly supplied to subsequent units. To ensure normal and safe gas use in subsequent units, biogas pretreatment and short-term storage in gas holders are necessary. Biogas's main component is methane, which is highly hazardous, necessitating a high level of safety in the gas holder structure.

[0004] Existing gas holders are mainly divided into wet gas holders and dry gas holders. Dry gas holders are further divided into double-membrane gas holders and curtain-type rubber membrane gas holders. Both wet gas holders and curtain-type rubber membrane gas holders have relatively complex structures, require more supporting equipment, and occupy a larger area. In addition, wet gas holders are easily corroded, resulting in low safety. Double-membrane gas holders mostly use soft membrane materials and have high environmental requirements, resulting in lower safety and a larger footprint. Therefore, there is an urgent need to develop a swamp storage gas holder with high safety and a simple structure.

[0005] This invention provides a simple complete set of biogas dry gas holder equipment and its control method to solve the problems of unstable biogas flow generated by anaerobic digestion that cannot guarantee normal gas use of subsequent units, as well as the high environmental requirements, large footprint, and low safety of existing gas holders. Summary of the Invention

[0006] The purpose of this invention is to provide a simple complete set of biogas dry gas holder equipment and its control method, so as to solve the problems of unstable biogas flow generated by anaerobic digestion that cannot guarantee the normal gas supply of subsequent units, as well as the high environmental requirements, large footprint, and low safety of existing gas holders.

[0007] The technical solution of the present invention is: a simple biogas dry gas holder complete set of equipment, including equipment foundation, outer steel tank and inner membrane fixedly installed on equipment foundation, gas inlet and outlet pipes, and condenser;

[0008] The inner membrane is disposed inside the outer steel tank;

[0009] The device is equipped with a through hole to accommodate inlet and outlet air pipes;

[0010] An opening is provided on the inner membrane at a position corresponding to the through hole;

[0011] The air inlet and outlet pipes pass through the through hole and are connected to the inner membrane through the opening;

[0012] The condenser is mounted on the foundation of the equipment and inserted into the inlet and outlet air pipes;

[0013] It also includes a counterweight system; the counterweight system includes an inner counterweight plate, a counterweight support frame, an outer counterweight pulley block, an outer counterweight block, and frame fixing pulleys;

[0014] The frame fixing pulleys are located at both ends of the counterweight support frame and are always in contact with the inner wall of the outer steel tank.

[0015] The inner counterweight plate is horizontally arranged and fixedly connected to the counterweight support frame, and acts on the inner membrane during the air inlet and outlet process of the inner membrane.

[0016] The outer counterweight pulley assembly includes at least one roller and a flexible cable passing over the roller, and at least one of the rollers is mounted on the outer steel tank body by a support column;

[0017] One end of the flexible cable is fixedly connected to the counterweight support frame, and the other end is connected to the outer counterweight block.

[0018] Preferably, the diameter of the inner counterweight plate is smaller than the inner diameter of the outer steel tank, but larger than half the inner diameter of the outer steel tank.

[0019] Preferably, a protective ring is provided around the inner counterweight plate; the protective ring is in contact with the outer steel tank body;

[0020] The protective ring is made of any one of polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, or polyamide.

[0021] Preferably, the outer steel tank body includes an outer steel tank wall and an outer steel tank top disposed at the upper end of the outer steel tank wall;

[0022] The outer steel tank wall is equipped with a maintenance manhole and a sight glass;

[0023] The outer steel tank wall is provided with several reinforcing steel rings around its perimeter.

[0024] Preferably, an instrumentation system is installed on the top of the outer steel tank; the instrumentation system includes a level gauge and a methane alarm.

[0025] Preferably, the air inlet and outlet pipes include an air inlet pipe, an air outlet pipe, and a condensate pipe;

[0026] The inner membrane includes an upper membrane and a bottom membrane; the bottom membrane is fixed to the equipment base by fixing bolts.

[0027] The bottom membrane has three openings, which are respectively connected to the air inlet pipe, the air outlet pipe, and the condensate pipe.

[0028] Preferably, the device also includes a positive pressure protector mounted on the device base, the positive pressure protector being connected to the air intake pipe.

[0029] Preferably, there are two rollers; one roller is mounted on the counterweight support frame via a support column; the other roller is mounted obliquely on the outer steel tank via a support column.

[0030] The present invention also provides a control method for the above-mentioned simplified biogas dry gas holder complete set of equipment, the control method being as follows:

[0031] a. Set the initial state so that there is no biogas in the inner membrane; set the initial weight of the outer counterweight block, then introduce gas into the inner membrane and make the inner counterweight plate rise with the top of the inner membrane;

[0032] b. Monitor the initial air intake pressure in the inner membrane in real time during the process of the inner membrane rising a rated distance;

[0033] c. Based on the initial air intake pressure, adjust the initial weight of the outer counterweight block, and then allow air to enter the inner membrane at a constant pressure to achieve biogas storage.

[0034] d. During venting, monitor the initial venting pressure in the inner membrane again as the inner membrane descends the rated distance;

[0035] e. Based on the initial exhaust pressure, continue to adjust the weight of the external counterweight block, and then exhaust gas from the inner membrane at a constant pressure to realize the external use of biogas.

[0036] Compared with the prior art, the advantages of the present invention are:

[0037] (1) This invention provides a simple complete set of biogas dry gas holder equipment and its control method. The counterweight system in the complete set of equipment includes modules such as an inner counterweight plate and an outer counterweight block. During the process of gas entering and exiting the inner membrane, the inner counterweight plate always acts horizontally on the inner membrane. By adjusting the counterweight of the outer counterweight block, the inner membrane can be gas-intake and exhaust at a constant pressure, thereby achieving safe storage of biogas and stable output flow to subsequent units for external use of biogas. This solves the problem of unstable biogas flow generated by anaerobic digestion in the prior art, which cannot guarantee normal gas use in subsequent units. The complete set of equipment has a simple structure and is easy to operate. The outer steel tank of the complete set of equipment has a large height-to-diameter ratio, making its area ratio small. The outer steel tank of the complete set of equipment can effectively reduce the environmental requirements of the complete set of equipment. The complete set of equipment is also equipped with an instrument system and supporting equipment, which makes it highly safe and excellent stable. This solves the problems of large footprint, high environmental requirements, and low safety of existing gas holders in the prior art.

[0038] (2) The present invention provides a simple biogas dry gas holder complete set of equipment, which includes a counterweight system. According to the real-time monitoring of the pressure in the inner membrane and the actual operation, it can realize that without stopping the operation, by adjusting the weight of the external counterweight, the biogas generated by anaerobic gas can be transported to the inner membrane at a constant pressure for temporary storage, and the biogas in the inner membrane can be transported to the subsequent unit at a stable flow rate for its use; thereby improving the efficiency of sewage treatment through anaerobic biological treatment process and saving operating costs.

[0039] (3) The present invention provides a simple biogas dry gas holder complete set of equipment. The bottom membrane of the complete set of equipment is fixed to the equipment foundation by fixing bolts, which can increase the stability of the inner membrane; the outer steel tank wall is provided with a reinforcing steel ring on the periphery to improve the stability of the outer steel tank, thereby improving the stability and safety of the complete set of equipment and increasing the service life of the complete set of equipment. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0041] Figure 1 This is a front view of the complete set of equipment structure described in this invention;

[0042] Figure 2This is a front view of the complete set of equipment structure described in this invention;

[0043] Figure 3 This is a top view of the internal counterweight system structure of the outer steel tank described in this invention;

[0044] Figure 4 This is a cross-sectional view of the internal counterweight system structure of the outer steel tank described in this invention along section AA;

[0045] The components include: 1. Outer steel tank body; 11. Outer steel tank wall; 12. Outer steel tank top; 13. Manhole; 14. Sight glass; 15. Reinforced steel ring; 2. Inner membrane; 21. Upper membrane; 22. Bottom membrane; 23. Fixing bolts; 24. Opening; 3. Counterweight system; 31. Inner counterweight plate; 311. Protective ring; 32. Counterweight support frame; 33. Frame fixing pulley; 34. Outer counterweight block pulley block; 341. Roller; 342. Flexible rope; 35. Outer counterweight block; 4. Inlet and outlet gas pipes; 41. Inlet gas pipe; 42. Outlet gas pipe; 43. Condensate pipe; 5. Positive pressure protector; 6. Condenser; 7. Instrument system; 71. Level gauge; 72. Methane alarm; 8. Equipment foundation; 81. Through hole; 9. Support column; Detailed Implementation

[0046] The present invention will be further described in detail below with reference to specific embodiments:

[0047] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "side", "right", "left", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] A simple biogas dry gas holder complete set of equipment, such as Figure 1As shown, the complete set of equipment first includes an equipment foundation 8 and an outer steel tank 1 and an inner membrane 2 fixedly mounted on the equipment foundation 8, inlet and outlet air pipes 4, and a condenser 6. The outer steel tank 1 includes an outer steel tank wall 11 and an outer steel tank top 12 located at the upper end of the outer steel tank wall 11. The outer steel tank wall 11 is equipped with a sight glass 14 for observing the interior of the outer steel tank 1 and a maintenance manhole 13 for convenient maintenance personnel to inspect the complete set of equipment. In addition, several reinforcing steel rings 15 are provided around the outer steel tank wall 11 to reinforce the outer steel tank 1 and increase its stability. Depending on different requirements, the outer steel tank 1 can be made of corrosion-resistant carbon steel or stainless steel, or other materials that meet the requirements. The shape of the outer steel tank 1 is not limited to spherical or cylindrical; it can be manufactured with a large height-to-diameter ratio to effectively reduce its floor space. The inner membrane 2 is installed inside the outer steel tank 1; the shape and size of the inner membrane 2 match the shape and size of the outer steel tank 1. The inner membrane 2 can be made of any material that meets the usage requirements. The inner membrane 2 includes an upper membrane 21 and a bottom membrane 22. The bottom membrane 22 is fixed to the equipment foundation 8 by fixing bolts 23 to increase the stability of the inner membrane 2, and an opening 24 is provided on the bottom membrane 22; a through hole 81 is provided on the equipment foundation 8 at a position corresponding to the opening 24 on the bottom membrane 22, and the air inlet and outlet pipes 4 pass through the through hole 81 and are connected to the inner membrane 2 through the opening 24. The gas inlet and outlet pipes 4 include an inlet pipe 41, an outlet pipe 42, and a condensate pipe 43. Correspondingly, the bottom membrane 22 is provided with three openings 24, and the equipment foundation 8 is provided with three through holes 81 at positions corresponding to the three openings 24. The inlet pipe 41, the outlet pipe 42, and the condensate pipe 43 pass through the through holes 81 and are connected to the three openings 24 on the bottom membrane 22. The condensate pipe 43 is used to discharge the condensate generated in the inner membrane 2 to ensure that the large amount of condensate generated in the gas holder due to temperature changes does not enter the outlet pipe with the biogas, thereby effectively preventing the phenomenon of condensate clogging the outlet pipe.

[0049] The condenser 6 is installed on the equipment foundation 8 and inserted into the inlet pipe 41 and the outlet pipe 42. The biogas produced in the anaerobic reactor contains a certain amount of water vapor. Due to the temperature difference between the inside of the anaerobic reactor and the outside, when the biogas produced in the anaerobic reactor is transported to the gas holder through the inlet pipe 41, some of the water vapor in the biogas will condense due to the temperature difference. The condenser 6 can remove the condensate formed in the inlet pipe 41; similarly, the condenser 6 can also remove the condensate formed in the outlet pipe 42. This prevents the pipes from becoming blocked due to a large amount of liquid accumulation in the inlet pipe 41 and the outlet pipe 42. At the same time, it can also prevent the condensate in the inlet pipe 41 from entering the inner membrane 2, reducing the water vapor content of the biogas before it enters the inner membrane. This prevents the condensate from corroding and damaging the inner membrane, affecting the sealing of the gas holder, and shortening the service life of the gas holder.

[0050] In other embodiments, at the positions corresponding to the three openings 24 on the equipment base 8, only one through hole 81 may be provided. The diameter of the through hole 81 is relatively large, allowing the air inlet pipe 41, the air outlet pipe 42, and the condensate pipe 43 to pass through simultaneously.

[0051] Secondly, the complete set of equipment also includes a counterweight system 3. The counterweight system 3 includes an inner counterweight plate 31, a counterweight support frame 32, an outer counterweight pulley assembly 34, and an outer counterweight block 35. The inner counterweight plate 31 is horizontally positioned and fixedly connected to the counterweight support frame 32, and it acts on the inner membrane 2 throughout the air intake and exhaust process. Furthermore, the diameter of the inner counterweight plate 31 is smaller than the inner diameter of the outer steel tank 1 but larger than half of the inner diameter of the outer steel tank 1. The outer counterweight pulley assembly 34 includes two rollers 341 and a flexible cable 342 spanning the rollers 341. One roller 341 is mounted on the counterweight support frame 32 via a support column 8, and the other roller 341 is inclinedly mounted on the outer steel tank 1 via the support column 8. One end of the flexible cable 342 is fixedly connected to the counterweight support frame 32, and the other end is connected to the outer counterweight block 35. The weight of the outer counterweight 35 is adjustable. When the complete set of equipment is in operation, the weight of the outer counterweight 35 can be adjusted according to the actual operating conditions to keep the inner counterweight plate 31 in a horizontal state and acting on the inner membrane 2 without stopping the operation.

[0052] In other embodiments, the outer counterweight pulley assembly 34 includes at least one roller 341; and when the outer counterweight pulley assembly 34 includes only one roller 341, the roller 341 should be inclinedly arranged on the outer steel tank body 1; for example, a curved support rod with a receiving groove is provided in the vertical direction of the counterweight support frame 32, one end of the flexible cable 342 is fixed to the counterweight support frame 32, then fits into the receiving groove on the support rod, and passes over the roller 341 inclinedly arranged on the outer steel tank body 1, and the other end of the flexible cable 342 is connected to the outer counterweight 35.

[0053] When the diameter of the inner counterweight plate 31 is the same as the inner diameter of the outer steel tank 1, there is a large frictional force between the inner counterweight plate 31 and the outer steel tank 1. When adjusting the weight of the outer counterweight block 35 to adjust the force exerted by the inner counterweight plate 31 on the inner membrane 2, the weight of the outer counterweight block 35 not only needs to match the weight of the inner counterweight plate 31 itself and the force between the inner counterweight plate 31 and the inner membrane 2, but also needs to overcome the frictional force between the inner counterweight plate 31 and the outer steel tank 1, thus increasing the difficulty of adjusting the weight of the outer counterweight block 35. In addition, when there is a large frictional force between the inner counterweight plate 31 and the outer steel tank 1, when adjusting the weight of the outer counterweight block 35 to make the inner counterweight block 31 rise or fall, due to the existence of friction, the inner counterweight plate 31 cannot rise or fall stably, thus making the inner counterweight plate 31 in an unstable motion state, which is not conducive to the inner counterweight plate 31 always being in a horizontal state. To reduce or avoid friction between the inner counterweight plate 31 and the outer steel tank 1, the diameter of the inner counterweight plate 31 is usually set to be smaller than the inner diameter of the outer steel tank 1.

[0054] In this embodiment, the diameter of the inner counterweight plate 31 is significantly smaller than the inner diameter of the outer steel tank 1, and slightly larger than half of the inner diameter of the outer steel tank 1. When the weight of the outer counterweight block 35 is adjusted so that the inner counterweight plate 31 presses down on the inner membrane 2, the inner membrane 2 will be subjected to the pressure of the gas inside it, and the periphery of the upper membrane 21 where it contacts the inner counterweight plate 31 will bulge upward. At this time, when the weight of the outer counterweight block 35 is adjusted so that the inner counterweight plate 31 rises, the bulging part on the upper membrane 21 will return to its original shape with the flow of the gas inside it. At the same time, because the diameter of the inner counterweight plate 31 is larger than half of the inner diameter of the outer steel tank 1, when the weight of the outer counterweight block 35 is adjusted so that the inner counterweight plate 31 presses down on the inner membrane 2, the inner membrane 2 will be subjected to the pressure of the gas inside it, and the periphery of the upper membrane 21 where it contacts the inner counterweight plate 31 will bulge upward. When the upper membrane 21 acts horizontally on the inner membrane 2 and moves downward, the periphery of the area where it connects with the inner counterweight plate 31 will bulge upward. However, the bulging part will not completely cover the inner counterweight plate 31. This effectively prevents the bulging parts on the upper membrane 21 from contacting and squeezing each other, which would increase the stress on the inner membrane 2 and cause irreversible deformation, thus affecting the service life of the inner membrane 2. It also prevents the bulging parts on the upper membrane 21 from adhering to the inner counterweight plate 31, thus avoiding the inner counterweight plate 31 from cutting, tearing, or abrading the inner membrane 2 when it acts horizontally on the inner membrane 2 and moves upward, thereby affecting the service life of the inner membrane 2. However, in other embodiments, if the diameter of the inner counterweight plate 31 is set slightly smaller than the inner diameter of the outer steel tank 1, although there is no friction between the inner counterweight plate 31 and the outer steel tank 1, when the weight of the outer counterweight block 35 is adjusted so that the inner counterweight plate 31 presses down on the inner membrane 2, the upper membrane 21 will be subjected to the pressure of its internal gas, and the periphery at the contact point with the inner counterweight plate 31 will bulge upward. Then, when the weight of the outer counterweight block 35 is adjusted so that the inner counterweight plate 31 rises, the bulging part of the upper membrane 21 is highly likely to be trapped in the gap between the inner counterweight plate 31 and the outer steel tank 1, and cannot return to its original shape with the flow of its internal gas. When the upper membrane 21 is trapped in the gap between the inner counterweight plate 31 and the outer steel tank 1, it will cause the inner counterweight plate 31 to be unable to move stably, which will not only affect the levelness of the inner counterweight plate 31, but also cause tearing and wear of the inner membrane 2, affecting its service life. Therefore, in other embodiments, such as Figure 2 As shown, a protective ring 311 can be provided around the inner counterweight plate 31 to allow the inner counterweight plate 31 to contact the outer steel tank 1. The protective ring needs to be made of a material with a certain degree of flexibility to reduce the friction between the protective ring 311 and the outer steel tank 1, and to prevent the bulging part of the upper membrane 21 from getting stuck in the gap between the inner counterweight plate 31 and the outer steel tank 1. The protective ring 311 can be made of any one of polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, polyamide, etc.

[0055] The counterweight system 3 also includes frame fixing pulleys 33; the frame fixing pulleys 33 are located at both ends of the counterweight support frame 32 and are always in contact with the inner wall of the outer steel tank 1; this ensures that the inner counterweight plate 31 is always in a horizontal state, improving the stability of the counterweight system 3. To ensure that the inner counterweight plate 31 is always in a horizontal state, the counterweight support frame 32, which is fixedly connected to the inner counterweight plate 31, needs to be in a horizontal state at all times, that is, to ensure that the counterweight support frame 32 remains horizontal during relative movement. To prevent the counterweight support frame 32 from swaying or tilting, the counterweight support frame 32 needs to be in contact with the inner wall of the outer steel tank 1; however, there cannot be too much friction between the counterweight support frame 32 and the outer steel tank 1. Therefore, this embodiment proposes to set frame fixing pulleys 33 at both ends of the counterweight support frame 32 to solve the above problems and meet the usage requirements. To further improve the stability and levelness of the counterweight support frame 32, support frames 321 are also provided at both ends of the counterweight support frame 32, and both the counterweight support frame 32 and the support frames 321 are connected to the frame fixing pulleys 33. In other embodiments, the support frames 321 may not be provided at both ends of the counterweight support frame 32; for example... Figure 3 , Figure 4 As shown, there are two counterweight support frames 32, and the two counterweight support frames 32 are arranged perpendicular to each other; each counterweight support frame 32 has a frame fixing pulley 33 at both ends, and the frame fixing pulley 33 is always in contact with the inner wall of the outer steel tank 1; the two counterweight support frames 32 are also provided with fixing frames 322, which can effectively prevent the structure between the two counterweight support frames 32 from deforming, thereby ensuring that the inner counterweight plate 31 is always in a horizontal state, improving the stability and stability of the counterweight system.

[0056] In addition, the complete set of equipment also includes a positive pressure protector 5 installed on the equipment foundation 8, and the positive pressure protector 5 is connected to the air inlet pipe 41; the positive pressure protector 5 is set with a safe pressure range, and when the positive pressure protector 5 detects that the biogas pressure in the inner membrane 2 exceeds the safe pressure range, the complete set of equipment will automatically depressurize to ensure the safe and stable operation of the inner membrane 2.

[0057] Finally, the complete set of equipment also includes an instrumentation system, which is installed on the top 12 of the outer steel tank. The instrumentation system includes instruments such as a level gauge 71 and a methane alarm 72. The level gauge 71 is used to detect the position of the inner counterweight plate 31 inside the outer steel tank 1, and the methane alarm 72 is used to detect the concentration of methane inside the outer steel tank 1. When the methane concentration is too high, the device will automatically open the electric valve. The instrumentation system 7 also includes equipment such as a gas holder pressure transmitter and an oxygen analyzer. The normal operation of the complete set of equipment is ensured through instrument detection and interlocking devices. The specific control method of this complete set of equipment is as follows: During the air intake process, initially, there is no biogas in the inner membrane 2, and the initial counterweight of the outer counterweight block 35 is set. Then, biogas is supplied to the inner membrane 2 through the air intake pipe 41, and the inner counterweight plate 31 rises with the top of the inner membrane 1. Next, the initial air intake pressure in the inner membrane 2 is monitored in real time during the rated rise of the inner membrane 2. Then, based on the initial air intake pressure, the counterweight of the outer counterweight block 35 is adjusted to ensure constant air intake in the inner membrane 2, thus achieving biogas storage. During the exhaust process, the initial exhaust pressure in the inner membrane 2 is monitored again during the rated descent of the inner membrane 2. Next, based on the initial exhaust pressure, the counterweight of the outer counterweight block 35 is adjusted again, and then the inner membrane 2 is exhausted at a constant pressure, thus achieving external use of biogas.

[0058] During operation, the biogas produced by the anaerobic biological treatment process passes through a condenser 6 fitted onto the inlet pipe 41 to remove condensate formed from water vapor condensation. The biogas then enters the inner membrane 2 for temporary storage. Simultaneously, the inlet pipe 41 is connected to a positive pressure protector 5, which monitors the gas pressure within the inner membrane 2. Based on the actual operation of the system, the weight of the outer counterweight 35 is adjusted to ensure the inner counterweight plate 31 always acts horizontally on the inner membrane 2, with a stable force exerted on it. This allows the biogas within the inner membrane 2 to pass through the condenser 6 fitted onto the outlet pipe 42 to remove condensate, and then be supplied to subsequent user units at a stable flow rate. During operation, the pressure of the biogas within the system and the condition of the inner membrane 2 can be determined by observing the changes in the values ​​of the positive pressure protector 5 and the various instruments in the instrument system 7, ensuring the safe and stable operation of the entire system. The above embodiments are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.

Claims

1. A simple biogas dry gas holder complete set of equipment, including equipment foundation (8), outer steel tank (1) and inner membrane (2) fixedly installed on equipment foundation (8), gas inlet and outlet pipes (4), and condenser (6); The inner membrane (2) is disposed inside the outer steel tank body (1); The equipment base (8) is provided with a through hole (81) for accommodating the air inlet and outlet pipes (4); An opening (24) is provided on the inner membrane (2) at a position corresponding to the through hole (81); The air inlet and outlet pipe (4) passes through the through hole (81) and then communicates with the inner membrane (2) through the opening (24); The condenser (6) is mounted on the equipment foundation (8) and inserted into the inlet and outlet air pipes (4); Its features are, It also includes a counterweight system (3); the counterweight system (3) includes an inner counterweight plate (31), a counterweight support frame (32), an outer counterweight pulley block (34), an outer counterweight block (35), and a frame fixing pulley (33); The frame fixing pulleys (33) are located at both ends of the counterweight support frame (32) and are always in contact with the inner wall of the outer steel tank (1); The inner counterweight plate (31) is horizontally arranged and fixedly connected to the counterweight support frame (32), and acts on the inner membrane (2) during the air inlet and outlet process; The outer counterweight pulley assembly (34) includes at least one roller (341) and a flexible cable (342) passing over the roller (341), and at least one of the rollers (341) is mounted on the outer steel tank body (1) by a support column (9); One end of the flexible cable (342) is fixedly connected to the counterweight support frame (32), and the other end is connected to the outer counterweight block (35); The diameter of the inner counterweight plate (31) is smaller than the inner diameter of the outer steel tank (1) and larger than half of the inner diameter of the outer steel tank (1); A protective ring (311) is provided around the inner counterweight plate (31); the protective ring (311) is in contact with the outer steel tank (1); The air inlet and outlet pipes (4) include an air inlet pipe (41), an air outlet pipe (42), and a condensate pipe (43).

2. The simplified biogas dry gas holder complete set of equipment according to claim 1, characterized in that: The protective ring (311) is made of any one of polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, or polyamide.

3. The simplified biogas dry gas holder complete set of equipment according to claim 1, characterized in that: The outer steel tank body (1) includes an outer steel tank wall (11) and an outer steel tank top (12) located at the upper end of the outer steel tank wall (11). The outer steel tank wall (11) is provided with a maintenance manhole (13) and a sight glass (14). The outer steel tank wall (11) is provided with several reinforcing steel rings (15) around its perimeter.

4. A complete set of simple biogas dry gas holder equipment according to claim 3, characterized in that: An instrument system (7) is installed on the top (12) of the outer steel tank; the instrument system (7) includes a level gauge (71) and a methane alarm (72).

5. A simplified biogas dry gas holder assembly according to claim 1, characterized in that: The inner membrane (2) includes an upper membrane (21) and a bottom membrane (22); the bottom membrane (22) is fixed to the equipment foundation (8) by fixing bolts (23); The bottom membrane (22) is provided with three openings (24), which are respectively connected to the air inlet pipe (41), the air outlet pipe (42), and the condensate pipe (43).

6. A simplified biogas dry gas holder assembly according to claim 5, characterized in that: It also includes a positive pressure protector (5) installed on the equipment foundation (8), which is connected to the air intake pipe (41).

7. A simplified biogas dry gas holder assembly according to claim 1, characterized in that: There are two rollers (341); One of the rollers (341) is mounted on the counterweight support frame (32) via a support column (9); the other roller (341) is mounted obliquely on the outer steel tank body (1) via a support column (9).

8. The control method for the simplified biogas dry gas holder assembly according to any one of claims 1-7, characterized in that, The control method is as follows: a. In the initial state, there is no biogas in the inner membrane (2); set the initial counterweight of the outer counterweight block (35), then introduce gas into the inner membrane (2) and make the inner counterweight plate (31) rise with the top of the inner membrane (2); b. During the process of the inner membrane (2) rising a rated distance, the initial air intake pressure in the inner membrane (2) is monitored in real time; c. Based on the initial air intake pressure, adjust the initial weight of the outer counterweight (35), and then allow air to enter the inner membrane (2) at a constant pressure to achieve biogas storage. d. During venting, monitor the initial venting pressure in the inner membrane (2) again as the inner membrane (2) descends the rated distance; e. Based on the initial exhaust pressure, continue to adjust the weight of the outer counterweight (35), and then exhaust the inner membrane (2) at a constant pressure to realize the external use of biogas.

Images