Biogas digester suitable for pig farm waste

Abstract

The biogas digester comprises a biogas digester body, an arc-shaped framework top is fixedly arranged at the top of the biogas digester body, a gas film is arranged on the outer side of the arc-shaped framework top, a sliding way is arranged at the bottom of the biogas digester body, a feeding sliding way is arranged at the upper end of the sliding way, a discharging opening is formed in the lower end of the sliding way, and a discharging pipe is arranged at the discharging opening. A rotating second spiral shaft is arranged in the discharging pipe; the lower end of the slide way is further provided with a first spiral shaft rotating vertically. By regularly turning and lifting wastes, pig hair and other difficult-to-decompose substances are effectively prevented from being accumulated at the bottom of the biogas digester, and the treatment efficiency of the biogas digester is improved. The spiral shaft driven by the motor is used for automatically turning over materials, the requirement for manual intervention is reduced, and the operation efficiency is improved. The problem that difficult-to-decompose substances such as pig hair are accumulated at the bottom of the biogas digester is solved, and the overall performance of the biogas digester is improved.

Description

Technical Field

[0001] The utility model relates to the field of biogas tanks, in particular to a biogas tank suitable for pig farm waste. Background Art

[0002] With the development of the pig farming industry, the disposal of pig farm waste has become a significant environmental issue. Traditional treatment methods often fail to meet environmental and resource utilization requirements. Anaerobic digestion, as an effective biological treatment method, can convert pig farm waste into useful biogas, but it presents several technical challenges, particularly when dealing with waste containing recalcitrant materials such as pig hair.

[0003] The hair mixed in pig manure is not easily decomposed by microorganisms during anaerobic digestion. Over time, this hair accumulates at the bottom of the digester. The accumulated hair combines with the surrounding biogas, forming clumps. These clumps not only occupy the effective volume of the digester but also affect the efficiency of biogas production. As the clumps continue to accumulate, a solidified layer gradually forms at the bottom of the digester, reducing the actual usable volume of the digester and increasing the difficulty of pumping out the material. The presence of clumps makes regular cleaning and maintenance very difficult, increasing operating costs and labor intensity. Utility Model Content

[0004] The main purpose of the utility model is to provide a biogas pool suitable for pig farm waste, so as to solve the problems in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: comprising a biogas tank, a curved frame top is fixedly provided on the top of the biogas tank, an air film is provided on the outer side of the curved frame top, a slide is provided at the bottom of the biogas tank, a feed slide is provided at the upper end of the slide, a discharge port is provided at the lower end, a discharge pipe is provided at the discharge port, and a second rotating spiral shaft is provided in the discharge pipe;

[0006] A first spiral shaft which rotates vertically is also provided at the lower end of the slideway.

[0007] Preferably, a plurality of bolts are fixed around the top of the biogas tank, the arc-shaped skeleton top and the outer side of the air membrane are fixed on the bolts, and a pressure ring is provided on the outer side of the air membrane, which is tightened by nuts and bolts to compress and fix the air membrane.

[0008] Preferably, the arc-shaped skeleton top, the air membrane and the biogas tank are sealed and connected by a seal.

[0009] Preferably, a gate valve is fixedly provided on the feed slide.

[0010] Preferably, a first driving mechanism is fixedly provided on the top of the biogas tank, and an output shaft of the first driving mechanism is fixedly connected to the first screw shaft.

[0011] Preferably, a second driving mechanism is fixedly provided on the top of the discharge pipe, and the output shaft of the second driving mechanism is fixedly connected to the second screw shaft.

[0012] Preferably, an opening is provided on one side of the top of the discharge pipe, and a transfer trough is provided at the opening.

[0013] Preferably, an air outlet is fixedly provided on the air membrane, and the air outlet is connected to the air storage unit through an air pipe and a control valve.

[0014] The utility model provides a biogas pool suitable for pig farm waste, which has the following beneficial effects:

[0015] 1. The first spiral shaft regularly turns the waste to ensure uniform distribution within the biogas tank, increasing the contact area between microorganisms and waste, thereby improving biogas production efficiency. This effectively prevents difficult-to-decompose materials such as pig hair from accumulating and forming lumps at the bottom of the tank, maintaining the effective volume of the biogas tank and further increasing biogas production.

[0016] 2. Regularly turning and cleaning the difficult-to-decompose materials at the bottom of the biogas tank prevents the formation of solidified layers, reduces long-term damage to the biogas tank structure, and extends the service life of the biogas tank. Through automated operation and regular cleaning, frequent repairs and cleaning work caused by caking and blockage are reduced, reducing maintenance costs.

[0017] 3. The motor-driven first and second screw shafts enable automatic turning and lifting of materials, reducing the need for manual intervention and improving operational efficiency. Safety devices such as gate valves and control valves effectively prevent biogas leaks and ensure operator safety. Furthermore, the transfer chute design facilitates waste management and cleanup, further enhancing operational safety and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a front sectional view of the overall structure of the utility model;

[0020] Figure 2 This utility model Figure 1 Middle partial enlarged view a;

[0021] In the figure: biogas tank 1; slide 101; discharge port 102; feed slide 2; gate valve 3; arc-shaped skeleton top 4; air film 5; air outlet 501; first screw shaft 6; first drive mechanism 7; discharge pipe 8; second screw shaft 9; second drive mechanism 10; transfer trough 11; bolt 12; pressure ring 13. DETAILED DESCRIPTION

[0022] like Figures 1 and 2As shown, a biogas digester suitable for pig farm waste includes a biogas digester 1, a curved skeleton top 4 is fixedly provided on the top of the biogas digester 1, an air film 5 is provided on the outer side of the curved skeleton top 4, a slide 101 is provided at the bottom of the biogas digester 1, a feed slide 2 is provided at the upper end of the slide 101, a discharge port 102 is provided at the lower end, a discharge pipe 8 is provided at the discharge port 102, and a second rotating spiral shaft 9 is provided in the discharge pipe 8;

[0023] A first vertically rotating screw shaft 6 is also provided at the lower end of the slideway 101 .

[0024] The waste from the pig farm enters the biogas tank 1 from the feed chute 2 and is concentrated to the bottom of the biogas tank 1 through the chute 101. The generated biogas rises to the top to support the air film 5; the arc-shaped skeleton top 4 is used to support the air film 5 to prevent the air film 5 from sinking due to rain or self-weight pressure when the air pressure is too low; the vertically rotating first screw shaft 6 can turn up the waste accumulated at the lower end of the chute 101, and at the same time, the waste at the upper end of the chute 101 slides to the lower end of the chute 101, thereby preventing the waste from clumping; the rotation of the second screw shaft 9 can move the waste into the discharge pipe 8 for discharge.

[0025] The biogas tank 1 is the primary container for anaerobic digestion, where pig farm waste is decomposed by microorganisms to produce biogas. A curved skeleton roof 4 and an air membrane 5 are located atop the tank to collect the generated biogas. The membrane expands and contracts with changes in the amount of gas inside, while the curved skeleton provides the necessary structural support to prevent the membrane from collapsing due to external factors such as rain or its own weight.

[0026] A feed chute 2 is located on one side of the biogas tank, facilitating the introduction of piggery waste into the tank. A chute 101, extending throughout the bottom of the biogas tank, helps the material move along a specific path and concentrate it in the bottom area for more complete fermentation. A first screw shaft 6 is mounted below the chute, and its rotation helps mix the material, promoting even fermentation while preventing clumping and clogging.

[0027] Discharge port 102 and discharge pipe 8 are used to remove residual materials after the digestion process. These materials are commonly referred to as digestate or biogas residue, which can be reused as resources such as fertilizer. A second screw shaft 9, located within the discharge pipe, rotates to help push the digested solids out of the tank, ensuring smooth discharge.

[0028] Preferably, a plurality of bolts 12 are fixed around the top of the biogas tank 1, and the outer sides of the arc-shaped skeleton top 4 and the air film 5 are fixed on the bolts 12. A pressure ring 13 is provided on the outer side of the air film 5, and the pressure ring 13 is tightened by tightening the nut and the bolts 12 to thereby press and fix the air film 5.

[0029] Bolts 12 are fixed around the top of the digester 1, securing the curved frame roof 4 and air film 5 to the digester. They form the foundation of the entire mounting system. A pressure ring 13 is placed outside the air film 5. Its function, in conjunction with bolts 12, is to ensure that the air film is evenly compressed and secured. When the nut is tightened, the pressure ring applies pressure to the air film, allowing the edge of the air film to fit tightly against the top of the digester, thus forming an effective seal and preventing biogas leakage.

[0030] Preferably, the arc-shaped frame top 4, the air membrane 5, and the biogas tank 1 are sealed by seals. Rubber sealing rings can be placed between the biogas tank top and the arc-shaped frame top, and between the arc-shaped frame top and the air membrane. When the pressure ring 13 is tightened by the bolt 12 and the nut, the sealing ring will be compressed to form a good seal.

[0031] Preferably, a gate valve 3 is fixed on the feed chute 2 to prevent biogas from overflowing through the feed chute 2.

[0032] Slide gate valves must provide excellent sealing properties to effectively prevent biogas leakage when closed. This is typically achieved by using corrosion-resistant and wear-resistant materials and suitable seals. To facilitate daily management and maintenance, slide gate valves should be designed for easy operation. Manual or electric operation can be selected based on actual needs, ensuring simple and reliable operation.

[0033] Preferably, a first drive mechanism 7 is fixedly provided on the top of the biogas tank 1, and the output shaft of the first drive mechanism 7 is fixedly connected to the first screw shaft 6. The first drive mechanism 7 includes a motor and a reducer, which drive the first screw shaft 6 to rotate, thereby turning the waste in the biogas tank 1 to prevent it from agglomerating.

[0034] Regular stirring increases the contact between waste and microorganisms, accelerating biodegradation. Continuously turning the material helps break up any solid buildup and keeps pipes clear. This helps evenly distribute the material throughout the tank, promoting a more efficient fermentation process. A highly automated drive system reduces the need for manual intervention and labor intensity.

[0035] Preferably, a second drive mechanism 10 is fixedly provided on the top of the discharge pipe 8, and the output shaft of the second drive mechanism 10 is fixedly connected to the second screw shaft 9. The second drive mechanism 10 includes a motor and a reducer, which drives the second screw shaft 9 to rotate, thereby lifting and discharging the waste in the biogas tank 1.

[0036] Preferably, an opening is provided on one side of the top of the discharge pipe 8, and a transfer trough 11 is provided at the opening. The waste lifted up by the second screw shaft 9 enters the transfer trough 11 from the opening.

[0037] Transfer chutes offer greater flexibility in waste discharge, eliminating the challenges of discharging large quantities of waste simultaneously. They disperse the material flow, reducing the risk of blockage in the discharge pipe caused by a large volume of waste passing through simultaneously. They also provide operators with greater control, allowing them to adjust the speed and method of waste processing based on the specific situation.

[0038] Preferably, an air outlet 501 is fixedly provided on the air membrane 5, and the air outlet 501 is connected to the air storage unit through an air pipe and a control valve.

[0039] The gas outlet 501 is located at the top or high point of the gas membrane so that the biogas can rise naturally and be discharged from here. The gas outlet needs to have good sealing performance to prevent air from entering the biogas tank, which may affect the quality of the biogas or cause the efficiency of the anaerobic digestion process to decrease.

[0040] The air pipe should be made of corrosion-resistant and aging-resistant materials, such as certain types of plastic or stainless steel, to ensure long-term reliability. The connection between the air pipe and the outlet must be secure and well-sealed. This can be achieved using specialized fittings or flanges. Regularly inspect the air pipe for wear, cracks, or other damage to ensure its integrity.

[0041] Control valves regulate the flow of biogas and can shut off the gas supply when necessary, such as during maintenance or in emergencies. They can be manual or automatic, with automatic valves offering more precise control through sensors and control systems. Choose valves suitable for high-pressure environments and ensure they can quickly close in the event of a leak to ensure operator safety.

[0042] Gas storage units can take various forms, such as flexible air bags and steel tanks, depending on the required storage capacity and site conditions. They should be equipped with appropriate pressure relief devices to prevent dangerous overpressure. Monitoring equipment, such as pressure gauges and thermometers, should be installed to monitor the unit's status in real time.

[0043] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A biogas digester suitable for pig farm waste, characterized by: The biogas tank (1) comprises a biogas tank (1), wherein an arc-shaped frame top (4) is fixedly provided on the top of the biogas tank (1), an air film (5) is provided on the outside of the arc-shaped frame top (4), a slideway (101) is provided on the bottom of the biogas tank (1), a feed slideway (2) is provided at the upper end of the slideway (101), a discharge port (102) is provided at the lower end, a discharge pipe (8) is provided at the discharge port (102), and a second rotating screw shaft (9) is provided in the discharge pipe (8); A first spiral shaft (6) that rotates vertically is also provided at the lower end of the slideway (101).

2. A biogas digester suitable for pig farm waste according to claim 1, characterized in that: A plurality of bolts (12) are fixed around the top of the biogas tank (1), the arc-shaped skeleton top (4) and the outer side of the air film (5) are fixed on the bolts (12), and a pressure ring (13) is provided on the outer side of the air film (5). The pressure ring (13) is tightened by nuts and bolts (12) to press and fix the air film (5).

3. A biogas digester suitable for pig farm waste according to claim 2, characterized in that: The arc-shaped skeleton top (4), the air film (5) and the methane tank (1) are sealed and connected via a sealing member.

4. The biogas digester suitable for pig farm waste according to claim 1, characterized in that: A plug valve (3) is fixedly provided on the feed slideway (2).

5. The biogas digester suitable for pig farm waste according to claim 1, characterized in that: A first driving mechanism (7) is fixedly provided on the top of the biogas tank (1), and an output shaft of the first driving mechanism (7) is fixedly connected to the first screw shaft (6).

6. The biogas digester suitable for pig farm waste according to claim 1, characterized in that: A second driving mechanism (10) is fixedly provided on the top of the discharge pipe (8), and an output shaft of the second driving mechanism (10) is fixedly connected to the second screw shaft (9).

7. The biogas digester suitable for pig farm waste according to claim 1, characterized in that: An opening is provided on one side of the top of the discharge pipe (8), and a transfer trough (11) is provided at the opening.

8. The biogas digester suitable for pig farm waste according to claim 1, characterized in that: An air outlet (501) is fixedly provided on the air film (5), and the air outlet (501) is connected to the air storage unit through an air pipe and a control valve.

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