High-efficiency purifying anaerobic tank

Abstract

The utility model relates to anaerobic tank field, specifically is a kind of high -efficient purification anaerobic tank, including anaerobic tank body, the surface of anaerobic tank body is fixedly connected with pressure relief pipe, the inner chamber of pressure relief pipe is provided with progressive pressure relief mechanism, the progressive pressure relief mechanism includes buffer tube, the inner wall of anaerobic tank body is fixedly connected with buffer tube, the inner wall of buffer tube is fixedly connected with silica gel cross valve piece, the inner wall of pressure relief pipe is fixedly connected with locating block, the inner chamber of pressure relief pipe is provided with conical block, one end of conical block is fixedly connected with bottom plate, and spring is arranged between the side opposite to locating block of bottom plate;The utility model is by setting progressive pressure relief mechanism, and pressure relief flow passage is gradually expanded and opened with conical block displacement, and the proportional relationship of discharge area and tank pressure, realize progressive, self-adapting pressure relief, effectively inhibit pressure sudden rise and sudden drop, maintain the stability of anaerobic tank inner pressure.

Description

Technical Field

[0001] This utility model relates to the field of anaerobic tanks, specifically a high-efficiency anaerobic purification tank. Background Technology

[0002] An anaerobic digester is a closed bioreactor used to degrade organic waste by anaerobic microorganisms under anaerobic conditions. Its core function is to stabilize and reduce the volume of organic matter by controlling process parameters such as temperature, pH and stirring, and simultaneously generate biogas, mainly composed of methane, as a renewable energy source.

[0003] Anaerobic digesters generate a large amount of gas during operation. If the gas cannot be discharged in time or the system malfunctions, the pressure inside the digester may rise rapidly, posing a risk of explosion or structural damage. The traditional method of pressure relief is through a safety valve. The safety valve opens instantaneously when the pressure inside the digester reaches a preset threshold, rapidly releasing a large amount of gas. Once the pressure drops back to the closing threshold, it closes immediately. This sudden opening and closing action causes violent fluctuations in the gas phase pressure inside the digester in a short period of time, disrupting the originally stable microenvironment inside the anaerobic reactor. This causes stress shocks to anaerobic microbial communities that strictly depend on steady-state conditions, such as methanogens. Sudden pressure changes can lead to altered cell membrane permeability, decreased enzyme activity, and even cell lysis, thereby reducing the rate of organic matter degradation and biogas production, and affecting the overall treatment efficiency and energy recovery performance of the anaerobic system. Utility Model Content

[0004] To address the shortcomings of existing technologies, anaerobic digesters generate a large amount of gas during operation. If the gas cannot be discharged in time or the system malfunctions, the pressure inside the digester may rise rapidly, posing a risk of explosion or structural damage. Traditional pressure relief methods rely on safety valves, which open instantaneously when the pressure inside the digester reaches a preset threshold, rapidly releasing a large amount of gas. Once the pressure drops back to the closing threshold, the valve immediately closes. This abrupt opening and closing action causes drastic fluctuations in the gas phase pressure inside the digester within a short period, disrupting the originally stable microenvironment inside the anaerobic reactor. This causes stress shocks to anaerobic microbial communities that strictly depend on steady-state conditions, such as methanogens. Sudden pressure changes can lead to altered cell membrane permeability, decreased enzyme activity, and even cell lysis, thereby reducing the rate of organic matter degradation and biogas production, affecting the overall treatment efficiency and energy recovery performance of the anaerobic system. This invention proposes a high-efficiency purification anaerobic digester.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a high-efficiency anaerobic purification tank, including an anaerobic tank body, an inspection port fixedly connected to one end of the anaerobic tank body, a water inlet fixedly connected to the surface of the inspection port, a pressure relief pipe fixedly connected to the surface of the anaerobic tank body, and a progressive pressure relief mechanism provided in the inner cavity of the pressure relief pipe.

[0006] The progressive pressure relief mechanism includes a buffer tube, which is fixedly connected to the inner wall of the anaerobic tank body. One end of the buffer tube is fixedly connected to one end of the pressure relief tube. A silicone cross valve plate is fixedly connected to the inner wall of the buffer tube. A positioning block is fixedly connected to the inner wall of the pressure relief tube. A conical block is provided in the inner cavity of the pressure relief tube. A base plate is fixedly connected to one end of the conical block. A spring is provided between the base plate and the side opposite to the positioning block. One end of the spring is fixedly connected to one side of the base plate, and the other end of the spring is fixedly connected to one side of the positioning block.

[0007] Preferably, a guide rod is slidably connected to the inner wall of the positioning block, the guide rod passes through the inner cavity of the spring, one end of the guide rod is fixedly connected to one side of the base plate, and the conical block is slidably connected to the inner wall of the pressure relief pipe through the guide rod, the positioning block and the spring.

[0008] Preferably, the inner wall of the buffer tube is fixedly connected with a spiral plate, and the number of spiral plates is several, which are arranged in a ring. The surface of the conical block is provided with a spiral groove.

[0009] Preferably, an annular valve seat is fixedly connected to the inner wall of the pressure relief pipe, the surface of the conical block contacts the inner wall of the annular valve seat, the annular valve seat is used in conjunction with the base plate, a sealing gasket is fixedly connected to one side of the base plate, and one side of the sealing gasket contacts one side of the annular valve seat.

[0010] Preferably, the surface of the pressure relief pipe is fixedly connected to a secondary pipe via a flange, and a rupture disc is fixedly connected to the inner wall of the secondary pipe, with cross-shaped notches on the surface of the rupture disc.

[0011] Preferably, the inner wall of the annular valve seat is provided with two sliding grooves. The inner wall of each of the two sliding grooves is provided with a steel ball. The two steel balls are respectively connected to the inner wall of the two sliding grooves. A tension spring is provided between the two steel balls and the opposite side of the two sliding grooves. One end of the tension spring is fixedly connected to the surface of the steel ball, and the other end of the tension spring is fixedly connected to the inner wall of the sliding groove. The steel ball is slidably connected to the inner wall of the sliding groove through the tension spring.

[0012] Preferably, the surface of the conical block is provided with two slots, and the surfaces of the two steel balls are in contact with the inner wall of the slots.

[0013] The advantages of this utility model are:

[0014] This invention employs a progressive pressure relief mechanism. When the anaerobic digester's pressure reaches a threshold, gas breaks through the silicone cross valve at the inlet of the buffer tube and enters the buffer chamber. As the pressure inside the buffer chamber continues to rise, the gas pushes the conical block to move axially, gradually opening the pressure relief channel. With the gradual increase in the size of the pressure relief channel, progressive venting is achieved. Simultaneously, the conical block compresses the reset spring to store energy. After the pressure inside the digester decreases, the spring releases energy to drive the conical block to automatically reset and restore the seal. Through the synergistic effect of the silicone cross valve and the buffer chamber, initial sealing and backflow prevention are achieved, preventing biogas leakage during low-pressure stages and improving gas collection efficiency. By using a tip-pressure, axially linear movement method for the conical block, the pressure relief channel gradually expands with the displacement of the conical block. The venting area is proportional to the pressure inside the digester, achieving progressive and adaptive pressure relief. This effectively suppresses sudden pressure rises and falls, maintains stable pressure inside the anaerobic digester, provides a mild and continuous metabolic environment for methanogenic bacteria, improves biogas production and system stability, and enhances gas collection purity and energy recovery efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is a partial structural schematic diagram of the progressive pressure relief mechanism of this utility model;

[0019] Figure 4 This is a partial structural diagram of the steel ball of this utility model.

[0020] In the diagram: 1. Anaerobic tank body; 2. Progressive pressure relief mechanism; 201. Buffer tube; 202. Silicone cross valve plate; 203. Conical block; 204. Spring; 205. Positioning block; 206. Base plate; 3. Pressure relief pipe; 4. Secondary pipe; 5. Annular valve seat; 6. Spiral groove; 7. Rupture disc; 8. Guide rod; 9. Sealing gasket; 10. Sliding groove; 11. Steel ball; 12. Tension spring; 13. Slot; 14. Spiral plate; 15. Inspection port; 16. Water inlet. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0023] This application discloses a high-efficiency anaerobic purification tank. (Refer to...) Figure 1 , Figure 2 , Figure 3 and Figure 4 A high-efficiency anaerobic purification tank includes an anaerobic tank body 1, an inspection port 15 is fixedly connected to one end of the anaerobic tank body 1, an inlet 16 is fixedly connected to the surface of the inspection port 15, a pressure relief pipe 3 is fixedly connected to the surface of the anaerobic tank body 1, and a progressive pressure relief mechanism 2 is provided in the inner cavity of the pressure relief pipe 3.

[0024] The progressive pressure relief mechanism 2 includes a buffer tube 201, which is fixedly connected to the inner wall of the anaerobic tank body 1. One end of the buffer tube 201 is fixedly connected to one end of the pressure relief tube 3. A silicone cross valve 202 is fixedly connected to the inner wall of the buffer tube 201, and a positioning block 205 is fixedly connected to the inner wall of the pressure relief tube 3. A conical block 203 is provided in the inner cavity of the pressure relief tube 3. One end of the conical block 203 is fixedly connected to a base plate 206. A spring 204 is provided between the base plate 206 and the opposite side of the positioning block 205. One end of the spring 204 is fixedly connected to one side of the base plate 206, and the other end of the spring 204 is fixedly connected to one side of the positioning block 205. By setting the progressive pressure relief mechanism 2, when the gas pressure in the anaerobic tank reaches the threshold, the gas breaks through the silicone cross valve 202 at the inlet of the buffer tube 201 and enters the buffer cavity. As the gas pressure in the buffer cavity continues to rise, the gas pushes the conical block 202... 3. Axial movement gradually opens the pressure relief channel. As the pressure relief channel gradually increases, progressive venting is achieved. At the same time, the conical block 203 compresses the reset spring 204 to store energy. After the pressure inside the tank decreases, the spring 204 releases energy to drive the conical block 203 to automatically reset and restore the seal. Through the synergistic effect of the silicone cross valve 202 and the buffer chamber, initial sealing and backflow prevention are achieved, preventing biogas leakage in the tank during the low-pressure stage and improving gas collection efficiency. By adopting the tip-pressure and axial linear movement method of the conical block 203, the pressure relief channel gradually expands as the conical block 203 moves. The venting area is proportional to the pressure inside the tank, achieving progressive and adaptive pressure relief, effectively suppressing sudden pressure rises and falls, maintaining the stability of the pressure inside the anaerobic tank, providing a mild and continuous metabolic environment for methanogenic bacteria, improving biogas production and system stability, and increasing gas collection purity and energy recovery efficiency.

[0025] Reference Figure 3 The inner wall of the positioning block 205 is slidably connected to a guide rod 8, which passes through the inner cavity of the spring 204. One end of the guide rod 8 is fixedly connected to one side of the base plate 206. The conical block 203 is slidably connected to the inner wall of the pressure relief pipe 3 through the guide rod 8, the positioning block 205 and the spring 204. The guide rod 8 is used to prevent the conical block 203 from deflecting during the pressure movement, ensuring that the conical block 203 always slides smoothly along the axis. At the same time, the guide rod 8 passes through the inner cavity of the spring 204, providing coaxial limit for the extension and retraction of the spring 204, avoiding bending or lateral deformation of the spring 204, and improving the stability and reliability of the spring 204's reset action.

[0026] Reference Figure 3 The inner wall of the buffer tube 201 is fixedly connected with a spiral plate 14. There are several spiral plates 14 arranged in a ring. The surface of the conical block 203 is provided with a spiral groove 6. Through the arrangement of the spiral plates 14 and the spiral groove 6, the annularly distributed spiral plates 14 can actively guide the gas to rotate in the circumferential direction after the gas enters, forming a stable swirling flow field and preventing the gas from directly impacting the tip area of ​​the conical block 203. During the movement of the gas conical block 203, the spiral groove 6 can also play a micro-guiding role, so that the gas during depressurization can enter the depressurization channel more smoothly and alleviate the transient impact of opening. In addition, the spiral groove 6 structure increases the turbulence area on the surface of the conical block 203, which helps to disperse thermal stress and corrosion concentration points.

[0027] Reference Figure 3 and Figure 4 An annular valve seat 5 is fixedly connected to the inner wall of the pressure relief pipe 3. The surface of the conical block 203 contacts the inner wall of the annular valve seat 5. The annular valve seat 5 is used in conjunction with the base plate 206. A sealing gasket 9 is fixedly connected to one side of the base plate 206. One side of the sealing gasket 9 contacts one side of the annular valve seat 5. Through the setting of the annular valve seat 5 and the sealing gasket 9, in the closed state, the surface of the conical block 203 is in contact with the inner wall of the annular valve seat 5, sealing the pressure relief flow channel. When the gas pressure in the tank exceeds the set threshold, the gas in the buffer chamber pushes the conical block 203 to move smoothly upward along the axial direction, so that the conical surface of the conical block 203 gradually separates from the annular valve seat 5. An annular pressure relief flow area is then formed between the two. The sealing gasket 9 can form an elastic static sealing barrier between the annular valve seat 5 and the base plate 206, blocking the path of gas escaping from the assembly gap at the rear end of the pressure relief pipe 3, and ensuring the stability of the seal.

[0028] Reference Figure 3The surface of the pressure relief pipe 3 is fixedly connected to the secondary pipe 4 via a flange. The inner wall of the secondary pipe 4 is fixedly connected to the rupture disc 7. The surface of the rupture disc 7 is provided with cross-shaped grooves. Through the setting of the secondary pipe 4 and the rupture disc 7, when the progressive pressure relief mechanism 2 fails to work normally due to abnormal conditions such as blockage or jamming, once the pressure inside the anaerobic tank body 1 reaches the set rupture value of the rupture disc 7, the rupture disc 7 will rupture instantly and completely along the cross-shaped grooves, quickly opening the large-diameter relief path, forcibly releasing the excessive pressure inside the tank, and preventing the anaerobic tank from deforming, leaking, or even exploding due to overpressure.

[0029] Reference Figure 4 The inner wall of the annular valve seat 5 has two sliding grooves 10. Each sliding groove 10 has a steel ball 11 on its inner wall. A tension spring 12 is positioned between each steel ball 11 and the inner wall of the two sliding grooves 10, with one end of the tension spring 12 fixedly connected to the surface of the steel ball 11 and the other end fixedly connected to the inner wall of the sliding groove 10. The steel ball 11 is slidably connected to the inner wall of the sliding groove 10 via the tension spring 12. The sliding groove 10, steel ball 11, and tension spring 12 can limit the conical block 203 in a sealed state, effectively preventing the conical block 203 from opening unexpectedly due to transportation vibration, tank shaking, or slight pressure fluctuations, thereby avoiding damage to the anaerobic environment or biogas leakage. At the same time, when the gas pressure inside the tank rises normally to the set threshold, the gas thrust is sufficient to overcome the preload of the tension spring 12, causing the steel ball 11 to retract outward along the sliding groove 10, releasing the conical block 203 and ensuring that the pressure relief function starts normally.

[0030] Reference Figure 4 The surface of the conical block 203 is provided with two slots 13. The surfaces of the two steel balls 11 are in contact with the inner wall of the slots 13. Through the setting of the slots 13, the positions of the two slots 13 and the two steel balls 11 correspond. When the conical block 203 is reset to the closed position, the steel balls 11 are automatically embedded in the slots 13 under the preload of the tension spring 12, realizing mechanical positioning and locking. The slots 13 provide the fitting space for the steel balls 11, ensuring the stability of the conical block 203 in the sealed state.

[0031] Working Principle: The anaerobic digester body 1 constructs and maintains a closed, anaerobic environment, allowing anaerobic microorganisms to grow normally or organic matter to be degraded under anaerobic conditions. In industrial settings, the anaerobic digester primarily functions as a bioreactor. It relies on the system's airtightness, the biogas produced by the microorganisms' metabolism to expel residual air, and, combined with stirring, heating, and liquid level control, maintains stable temperature, pH, and material mixing. This ensures the orderly progression of hydrolysis, acidification, acetylation, and methanogenesis, ultimately achieving the stabilization of organic waste and the recovery of biogas energy. The detection port 15 is used to install online sensors for pH, temperature, redox potential, or gas composition, or as a manual sampling point to periodically collect liquid and sludge samples, monitoring the internal biogas production in real time. The anaerobic digester body 1 is equipped with a sludge filtration system. The system monitors the sludge's chemical state, acidification risk, sludge activity, and operational stability, providing data support for process control. The inlet 16 continuously supplies substrate to maintain reaction momentum, while the detection port 15 synchronously feeds back system operating parameters. Together, they achieve closed-loop management of input, response, monitoring, and regulation, ensuring stable, efficient, and safe operation of the anaerobic digestion process under optimal conditions. This is existing technology and will not be elaborated further. Under normal operating conditions, the conical block 203 of the anaerobic digester body 1 is tightly fitted against the sealing surface of the annular valve seat 5 under the pre-tightening force of the return spring 204. At this time, the two steel balls 11 inside the annular valve seat 5 engage with the two slots 13 on the surface of the conical block 203. Under the action of the tension spring 12, the steel balls 11 are locked into the slots 13, forming a mechanical axial lock, effectively preventing vibration-induced axial locking. Dynamic, negative pressure, or minor disturbances can cause the conical block 203 to open unexpectedly, ensuring the sealing of the pressure relief channel. Simultaneously, a static seal is formed between the bottom plate 206 and the end face of the annular valve seat 5 via a sealing gasket 9, further preventing gas leakage. When the gas pressure inside the anaerobic tank gradually increases and reaches a set threshold, the gas first breaks through the silicone cross valve plate 202 at the inlet of the buffer tube 201 and enters the buffer chamber. The spiral plate 14 on the inner wall of the buffer chamber guides the airflow to form a stable vortex, ensuring the gas acts evenly on the surface of the conical block 203. Simultaneously, the spiral groove 6 on the surface of the conical block 203 can cooperate with the spiral plate 14 inside the buffer tube 201, guiding the airflow smoothly along the spiral path after the gas enters the buffer chamber, forming an orderly vortex and reducing the scouring of the tip of the conical block 203 by the gas. The axial movement of the moving conical block 203 generates an axial thrust that overcomes the spring force of the return spring 204 and the locking force of the steel ball 11, pushing the conical block 203 smoothly outward along the guide rod 8. The steel ball 11 is then pushed out of the slot 13 and compressed by the tension spring 12, retracting into the sliding groove 10, thus releasing the conical block 203. As the conical block 203 continues to move, its conical surface gradually detaches from the inner wall of the annular valve seat 5, forming a continuously expanding annular pressure relief channel between the conical surface of the conical block 203 and the inner wall of the annular valve seat 5. The relief area gradually increases with increasing pressure. During this process, the guide rod 8 penetrates the inner cavity of the spring 204 and provides coaxial guidance for the conical block 203 and the spring 204, preventing skewing and ensuring smooth movement. When the pressure inside the tank drops below the threshold value...The return spring 204 releases its stored energy, pushing the conical block 203 back to its original position. Under the action of the tension spring 12, the steel ball 11 re-enters the slot 13, completing self-locking and restoring a completely sealed state. Furthermore, the side wall of the pressure relief pipe 3 is connected via a flange to a secondary pipe 4 with a cross-shaped rupture disc 7, serving as an independent protection device. If the progressive pressure relief mechanism 2 fails and the pressure abnormally surges to the burst set value, the rupture disc 7 ruptures instantly, forcibly opening the large-diameter emergency relief channel to prevent overpressure accidents. The flange connection allows for the replacement of the secondary pipe 4. When the rupture disc 7 ruptures due to overpressure or requires maintenance, simply loosening the flange bolts allows for the removal and replacement of the entire secondary pipe 4.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-efficiency anaerobic purification tank, comprising an anaerobic tank body (1), characterized in that: One end of the anaerobic tank body (1) is fixedly connected to an inspection port (15), the surface of the inspection port (15) is fixedly connected to a water inlet (16), the surface of the anaerobic tank body (1) is fixedly connected to a pressure relief pipe (3), and the inner cavity of the pressure relief pipe (3) is provided with a progressive pressure relief mechanism (2). The progressive pressure relief mechanism (2) includes a buffer tube (201), which is fixedly connected to the inner wall of the anaerobic tank body (1). One end of the buffer tube (201) is fixedly connected to one end of the pressure relief tube (3). A silicone cross valve plate (202) is fixedly connected to the inner wall of the buffer tube (201). A positioning block (205) is fixedly connected to the inner wall of the pressure relief tube (3). A conical block (203) is provided in the inner cavity of the pressure relief tube (3). A base plate (206) is fixedly connected to one end of the conical block (203). A spring (204) is provided between the base plate (206) and the opposite side of the positioning block (205). One end of the spring (204) is fixedly connected to one side of the base plate (206), and the other end of the spring (204) is fixedly connected to one side of the positioning block (205).

2. The high-efficiency anaerobic purification tank according to claim 1, characterized in that: The inner wall of the positioning block (205) is slidably connected to a guide rod (8), which extends through the inner cavity of the spring (204). One end of the guide rod (8) is fixedly connected to one side of the base plate (206). The conical block (203) is slidably connected to the inner wall of the pressure relief pipe (3) through the guide rod (8), the positioning block (205) and the spring (204).

3. The high-efficiency anaerobic purification tank according to claim 1, characterized in that: The inner wall of the buffer tube (201) is fixedly connected with a spiral plate (14), and there are several spiral plates (14) arranged in a ring. The surface of the conical block (203) is provided with a spiral groove (6).

4. The high-efficiency anaerobic purification tank according to claim 1, characterized in that: The inner wall of the pressure relief pipe (3) is fixedly connected to an annular valve seat (5), the surface of the conical block (203) is in contact with the inner wall of the annular valve seat (5), the annular valve seat (5) is used in conjunction with the base plate (206), a sealing gasket (9) is fixedly connected to one side of the base plate (206), and one side of the sealing gasket (9) is in contact with one side of the annular valve seat (5).

5. The high-efficiency anaerobic purification tank according to claim 1, characterized in that: The surface of the pressure relief pipe (3) is fixedly connected to a secondary pipe (4) via a flange. A rupture disc (7) is fixedly connected to the inner wall of the secondary pipe (4). The surface of the rupture disc (7) is provided with cross-shaped grooves.

6. The high-efficiency anaerobic purification tank according to claim 4, characterized in that: The inner wall of the annular valve seat (5) is provided with a sliding groove (10). There are two sliding grooves (10). The inner wall of each sliding groove (10) is provided with a steel ball (11). The two steel balls (11) are respectively connected to the inner wall of the two sliding grooves (10). A tension spring (12) is provided between the two steel balls (11) and the opposite side of the two sliding grooves (10). One end of the tension spring (12) is fixedly connected to the surface of the steel ball (11), and the other end of the tension spring (12) is fixedly connected to the inner wall of the sliding groove (10). The steel ball (11) is slidably connected to the inner wall of the sliding groove (10) through the tension spring (12).

7. The high-efficiency anaerobic purification tank according to claim 6, characterized in that: The surface of the conical block (203) is provided with a slot (13), and there are two slots (13). The surfaces of the two steel balls (11) are in contact with the inner wall of the slot (13).

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