Soft-top biogas storage device of concrete anaerobic tank

Abstract

The utility model relates to a soft-top biogas storage device of a concrete anaerobic tank, which mainly solves the technical problems of biogas leakage, larger occupied area and the like caused by the fact that a concrete tank top is easy to crack. According to the technical scheme, the soft-top biogas storage device of the concrete anaerobic tank comprises the concrete anaerobic reaction tank, a lower pressing plate welded with an anchoring rib is embedded in the upper edge of the tank wall of the concrete anaerobic reaction tank, and an inner film, an outer film and an upper pressing plate are sequentially placed on the lower pressing plate and then are fastened through bolts. The lower pressing plate is made of channel steel, and the upper pressing plate is made of angle steel. In order to improve the sealing performance, a layer of sealing rubber pad is placed among the lower pressing plate, the upper pressing plate, the inner film and the outer film respectively.

Description

Technical Field

[0001] This utility model relates to a biogas storage device, and more particularly to a soft-roof biogas storage device for a concrete anaerobic digester. Background Technology

[0002] The double-membrane gas holder is 3 / 4 spherical in shape and is fixed to a concrete base by steel rails. The holder consists of an outer membrane, an inner membrane, a bottom membrane, and auxiliary equipment. A variable-capacity, airtight space is formed between the inner and bottom membranes for gas storage. The space between the outer and inner membranes serves as a pressure regulating space. A blower on the outer membrane maintains constant pressure. When the gas volume in the inner membrane decreases, air is drawn into the space between the inner and outer membranes through the blower, maintaining the design pressure of the inner membrane and stabilizing the rigidity of the outer membrane. When the gas volume increases, the inner membrane expands normally, and excess air is discharged from the outer membrane through a safety valve (or an outer membrane water seal), ensuring that the gas pressure in the inner membrane remains constant at the required design pressure.

[0003] Anaerobic fermentation systems widely employ double-membrane gas holders to store the biogas produced during fermentation. The biogas is collected in a sealed area at the top of the reactor and then transported to the double-membrane gas holder via a biogas delivery pipeline. According to relevant regulations, the double-membrane gas holder must maintain a prescribed safe distance from surrounding facilities.

[0004] For reactors with concrete tanks, cracks can easily form on the concrete roof, leading to biogas leaks.

[0005] In addition, compared with steel anaerobic tanks, concrete tank reactors are lower in height but larger in area, and the installation of independent double-membrane gas holders makes the overall footprint even larger. Utility Model Content

[0006] The purpose of this invention is to provide a soft-roof biogas storage device for concrete anaerobic digesters, mainly to solve the technical problems of biogas leakage caused by cracks in the concrete top of the digester and the large footprint.

[0007] The technical solution of this utility model is as follows: a soft-top biogas storage device for a concrete anaerobic digester, comprising a concrete anaerobic reactor, a lower pressure plate pre-embedded and welded to anchor bars along the upper edge of the reactor wall, and an inner membrane, an outer membrane, and an upper pressure plate placed sequentially on the lower pressure plate and then fastened with bolts. The lower pressure plate is made of channel steel, and the upper pressure plate is made of angle steel; to increase sealing, a sealing rubber gasket is placed between each of the lower pressure plate, the upper pressure plate, the inner membrane, and the outer membrane.

[0008] Several steel plates are pre-embedded along the inner side of the upper edge of the concrete anaerobic reactor wall. Stainless steel pull rings are welded and fixed to the steel plates, and safety belts are fixed to the pull rings. The safety belts are positioned above the liquid level and are used to support the inner membrane when there is no gas in the gas holder.

[0009] The outer membrane and inner membrane form a pressure regulating chamber, while the inner membrane and safety belt form a biogas chamber. A rangefinder is installed on the top of the outer membrane. The outer membrane has an air inlet and an air outlet. The air inlet is connected to a check valve and a blower via a flexible hose, and the air outlet is connected to an outer membrane water seal machine via a flexible hose. The cross-section of the concrete anaerobic tank is rectangular, square, or circular.

[0010] The beneficial effects of this utility model are: by placing the inner and outer membranes of the double-membrane gas holder directly on the top of the anaerobic reactor, replacing the concrete top cover of the reactor, the gas storage space at the top of the anaerobic reactor is increased, which can replace the separately set double-membrane gas holder, reducing investment and land occupation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 A schematic diagram of the fixing structure for installing the walls of a concrete anaerobic reactor.

[0013] In the diagram: 1-Concrete anaerobic reactor, 101-Concrete anaerobic reactor wall, 2-Lower pressure plate, 3-Anchoring bar, 4-Upper pressure plate, 5-Inner membrane, 6-Outer membrane, 7-Steel plate, 8-Pull ring, 9-Safety belt, 10-Pressure regulating chamber, 11-Biogas chamber, 12-Radarmeter, 13-Hose, 14-Outer membrane water seal machine, 15-Check valve, 16-Fan, 17-Sealing rubber gasket. Detailed Implementation

[0014] Example 1, referring to Figure 1 , Figure 2 A soft-top biogas storage device for a concrete anaerobic digester includes a rectangular concrete anaerobic reactor 1. A lower pressure plate 2, welded to anchor bars 3, is pre-embedded along the upper edge of the reactor wall 101. An inner membrane 5, an outer membrane 6, and an upper pressure plate 4 are placed sequentially on the lower pressure plate and then secured with bolts. The lower pressure plate 2 is made of channel steel, and the upper pressure plate 4 is made of angle steel. To increase sealing, a sealing rubber gasket 17 is placed between each of the lower pressure plate 2, the upper pressure plate 4, the inner membrane 5, and the outer membrane 6.

[0015] Several steel plates 7 are pre-embedded on the inner side of the upper edge of the concrete anaerobic reactor wall 101. Stainless steel pull rings 8 are welded and fixed on the steel plates 7, and safety belts 9 are fixed on the pull rings 8. The safety belts 9 are located above the liquid level and are used to support the inner membrane 5 when there is no gas in the gas holder.

[0016] A pressure regulating chamber 10 is located between the outer membrane 6 and the inner membrane 5, and a biogas chamber 11 is located between the inner membrane 5 and the safety belt 9. A rangefinder 12, which is an ultrasonic level gauge, is installed at the top center of the outer membrane. The outer membrane 6 has an air inlet and an air outlet. The air inlet is connected to a check valve 15 and a blower 16 via a hose 12, and the air outlet is connected to an outer membrane water seal machine 14 via a hose 13. During use, the biogas produced after anaerobic fermentation directly enters the inner membrane 5 at the top of the anaerobic digester for storage. The rangefinder 12 is installed at the top of the outer membrane 6 to detect the biogas level (inner membrane height). An observation window is also provided on the outer membrane 6. The air inlet of the outer membrane 6 is used for supplemental air and pressurization between the inner and outer membranes; the air outlet is used to release pressure when the inner membrane rises, maintaining a constant biogas pressure at the top of the reaction tank.

[0017] Example 2: The cross-section of the concrete anaerobic tank is circular, and the rest is the same as in Example 1.

[0018] Example 3: The cross-section of the concrete anaerobic tank is square, and the rest is the same as in Example 1.

Claims

1. A soft top methane storage device for a concrete anaerobic lagoon comprising a concrete anaerobic lagoon characterized by: The lower pressing plate is embedded and anchored with the anchor bar at the upper edge of the pool wall of the concrete anaerobic reaction pool, and the inner membrane, the outer membrane and the upper pressing plate are placed in sequence above the lower pressing plate and fastened with bolts; a plurality of steel plates are embedded at the inner side of the upper edge of the pool wall of the concrete anaerobic reaction pool, stainless steel pull rings are welded and fixed on the steel plates, and safety belts are fixed on the pull rings; a range finder is arranged at the top of the outer membrane, a pressure regulating chamber is arranged between the outer membrane and the inner membrane, a biogas chamber is arranged between the inner membrane and the safety belt, the outer membrane is provided with an air inlet and an air outlet, the air inlet is connected with a check valve and a fan in sequence through a hose, and the air outlet is connected with an outer membrane water seal machine through a hose.

2. A soft top biogas storage apparatus for an anaerobic digester according to claim 1, wherein: The lower pressing plate is a channel steel.

3. A soft top methane storage device for an anaerobic digester according to claim 1, wherein: The upper pressing plate is an angle steel.

4. A soft top methane storage device for an anaerobic digester according to claim 1, wherein: A layer of sealing rubber pad is arranged between the lower pressing plate, the upper pressing plate, the inner membrane and the outer membrane.

5. A soft top biogas storage apparatus for an anaerobic digester according to claim 1, wherein: The safety belt is located above the liquid level and is used for supporting the inner membrane when there is no gas in the gas tank.

6. A soft top methane storage device for an anaerobic digester according to claim 1, wherein: The range finder is an ultrasonic level meter.

7. A soft top methane storage device for an anaerobic digester according to claim 1, wherein: The cross section of the concrete anaerobic pool is one of a rectangular shape, a square shape or a circular shape.

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