A biogas defoaming device

Abstract

This utility model discloses a biogas defoaming device, relating to the field of biogas treatment technology. It includes a defoaming tank, a balancing tank, and a water collection tank. A solid-liquid-gas separator is fixedly connected to the middle of the defoaming tank, and a spray pipe is located directly above the separator. An air inlet pipe and an air outlet pipe are connected to the top of the defoaming tank, with one end of the inlet pipe extending to the bottom of the tank. An overflow pipe is fixedly connected inside the balancing tank, which communicates with the bottom of the defoaming tank. The inlet of the water collection tank is connected to the overflow pipe, and the outlet of the water collection tank is connected to a liquid pump, the outlet of which is connected to the spray pipe. This biogas defoaming device can efficiently remove sludge particles and foam from biogas, reducing biogas pressure fluctuations.

Description

Technical Field

[0001] This utility model relates to the field of biogas treatment technology, specifically a biogas defoaming device. Background Technology

[0002] In anaerobic digestion processes, the biogas produced by IC reactors is often affected by load fluctuations or changes in sludge activity, carrying a large amount of foam and fine sludge particles. If these impurities enter the subsequent desulfurization system, they can cause desulfurizing agent blockage, reduced efficiency, and even serious problems such as equipment corrosion. Existing biogas defoaming devices mostly use filters or cyclone separators, which, while achieving impurity separation to some extent, generally have the following shortcomings:

[0003] 1. Large pressure fluctuations: Due to changes in biogas flow rate, the system pressure is prone to significant oscillations, causing instability in gas-liquid separation and affecting the overall defoaming efficiency. Pressure fluctuations may also cause equipment vibration, shortening its service life.

[0004] 2. Incomplete defoaming: Foam is characterized by strong adhesion and high stability, making it difficult for traditional spray-based defoaming methods to continuously suppress foam regeneration. Spray droplets often fail to completely break up the foam on its surface, especially when the foam concentration is high or its viscosity is high, leading to insufficient defoaming and thus affecting the quality of biogas purification.

[0005] Therefore, it is necessary to propose a biogas defoaming device to solve the above problems. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] The purpose of this invention is to provide a biogas defoaming device to solve the problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a biogas defoaming device, comprising:

[0010] A demister is provided, wherein a solid-liquid-gas separator is fixedly connected to the middle of the demister, a spray pipe is provided directly above the solid-liquid-gas separator, and an air inlet pipe and an air outlet pipe are connected to the top of the demister, with one end of the air inlet pipe extending to the bottom of the interior of the demister.

[0011] A balance tank, the inside of which is fixedly connected to an overflow pipe, and the balance tank is connected to the bottom of a demister tank;

[0012] A water collection tank, wherein the inlet of the water collection tank is connected to an overflow pipe, and the outlet of the water collection tank is connected to a liquid pump, and the outlet of the liquid pump is connected to a spray pipe.

[0013] Preferably, the solid-liquid-gas separator has multiple layers, and each layer of the solid-liquid-gas separator is provided with a spray pipe directly above it.

[0014] Preferably, the outlet of the liquid pump is connected to the spray pipe and the drain pipe through a three-way pipe, an electric valve is fixedly connected to the drain pipe, and a liquid level switch is fixedly connected inside the water collection tank.

[0015] Preferably, there are two liquid level switches.

[0016] Preferably, the solid-liquid-gas separator is a baffle plate gas-liquid separator, a cyclone plate gas-liquid separator, or a packed gas-liquid separator.

[0017] Preferably, multiple spray heads are fixedly connected to the spray pipe.

[0018] Preferably, the overflow pipe includes a movable pipe and a fixed pipe, the movable pipe and the fixed pipe are slidably and sealingly connected, and a positioning bolt is threaded onto the wall of the movable pipe.

[0019] Preferably, a sealing ring is fixedly connected inside the movable tube.

[0020] Preferably, the liquid level in the demister is lower than the height of the solid-liquid-gas separator, and the height of the air outlet end of the air inlet pipe is lower than the liquid level.

[0021] Preferably, a drain pipe is connected to one bottom end of the demister.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention provides a biogas defoaming device, which has the following beneficial effects:

[0024] 1. This biogas defoaming device, by setting up a defoaming tank and fixing a solid-liquid-gas separator and spray pipe in the defoaming tank, achieves efficient removal of sludge particles and foam in biogas.

[0025] 2. This biogas defoaming device, by setting up a defoaming tank and a balance tank, when the biogas pressure in the defoaming tank increases, the gas compresses the liquid surface, causing the liquid to flow into the balance tank through the connecting pipe to release the pressure; when the pressure decreases, the liquid flows back, preventing biogas backflow, thereby achieving a buffering effect on biogas and reducing pressure fluctuations.

[0026] 3. This biogas defoaming device, by setting up a drain pipe, a liquid level switch and an electric valve, and by linking the liquid level switch with the electric valve controller, can achieve unattended drainage and spraying. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a cross-sectional schematic diagram of the overflow pipe of this utility model.

[0029] In the diagram: 1. Air inlet pipe; 2. Defoamer; 3. Spray head; 4. Solid-liquid-gas separator; 5. Air outlet pipe; 6. Spray pipe; 7. Electric valve; 8. Drain pipe; 9. Liquid level switch; 10. Liquid pump; 11. Connecting pipe; 12. Balance tank; 13. Overflow pipe; 14. Water collection tank; 15. Movable pipe; 16. Sealing ring; 17. Positioning bolt; 18. Fixed pipe; 19. Sewage pipe. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Please see Figure 1-2 As shown, a biogas defoaming device includes a defoaming tank 2, a balance tank 12, and a water collection tank 14. A solid-liquid-gas separator 4 is fixedly connected to the middle of the defoaming tank 2, and a spray pipe 6 is provided directly above the solid-liquid-gas separator 4. An air inlet pipe 1 and an air outlet pipe 5 are connected to the top of the defoaming tank 2, with one end of the air inlet pipe 1 extending to the bottom of the interior of the defoaming tank 2. An overflow pipe 13 is fixedly connected inside the balance tank 12, and the balance tank 12 is connected to the bottom of the defoaming tank 2 through a connecting pipe 11. The liquid inlet of the water collection tank 14 is connected to the overflow pipe 13, and the liquid outlet of the water collection tank 14 is connected to a liquid pump 10, with the liquid outlet of the liquid pump 10 connected to the spray pipe 6. Specifically, the liquid level in the defoaming tank 2 is lower than the height of the solid-liquid-gas separator 4, and the height of the air outlet of the air inlet pipe 1 is lower than the liquid level.

[0032] Installation configuration: Connect the air inlet pipe 1 to the biogas outlet of the IC reactor, connect the air outlet pipe 5 to the biogas inlet of the desulfurization system, inject liquid into the balance tank 12, part of the liquid enters the demister tank 2 from the balance tank 12, liquid seal the air outlet end of the air inlet pipe 1, and the other part of the liquid flows into the water collection tank 14 through the overflow pipe 13 as the start-up water for the spraying.

[0033] Biogas entry and preliminary separation: Biogas to be treated is introduced into the defoaming tank 2 through the air inlet pipe 1. After entering the defoaming tank 2, the biogas flow rate in the defoaming tank 2 decreases. Under the action of the solid-liquid-gas separator 4, large particles of sludge and foam are separated and made to sink to the bottom of the tank. The biogas after preliminary separation flows upward.

[0034] Spraying defoaming and secondary separation: The spraying water is drawn from the water tank 14 by the liquid pump 10 and transported to the spray pipe 6. The spray droplets of the spray pipe 6 come into contact with the residual foam in the rising biogas, further breaking the foam, and the tiny particles settle with the droplets.

[0035] Pressure balancing: Liquid at the bottom of the demister 2 flows into the spray pipe 6 through the connecting pipe 11, and excess liquid flows into the water collection tank 14 through the overflow pipe 13 to control the liquid level in the demister 2. Simultaneously, when the biogas pressure in the demister 2 increases, the gas compresses the liquid surface, causing the liquid to flow into the balance tank 12 through the connecting pipe 11, releasing the gas pressure through the liquid's displacement. When the pressure decreases, the liquid flows back, preventing biogas backflow and thus achieving pressure buffering.

[0036] The solid-liquid-gas separator 4 has multiple layers, and each layer of the solid-liquid-gas separator 4 is equipped with a spray pipe 6 directly above it. By setting up multiple layers of solid-liquid-gas separators 4 and spray pipes 6, the removal efficiency of sludge and foam can be further improved.

[0037] Due to the deposition of sludge and foam carried by biogas, and the influence of air pressure inside the demister 2, the liquid level in the water collection tank 14 will be affected. To facilitate the discharge of excess spray water, the outlet of the liquid pump 10 is connected to the spray pipe 6 and the drain pipe 8 via a three-way pipe. An electric valve 7 is fixedly connected to the drain pipe 8, and a liquid level switch 9 is fixedly connected inside the water collection tank 14. When the liquid level in the water collection tank 14 rises and triggers the liquid level switch 9, the liquid level switch 9 controls the electric valve 7 to open, and part of the liquid pumped by the liquid pump 10 is discharged through the drain pipe 8. Preferably, there are two liquid level switches 9, which are fixed at the upper and lower limits of the liquid level, respectively. When the liquid level rises to the upper limit, the liquid level switch at the upper limit is triggered. After receiving the signal, the controller controls the electric valve 7 to open, preventing the liquid level from continuing to rise. When the liquid level drops below the lower limit, the liquid level switch 9 at the lower limit is triggered, controlling the electric valve 7 to close, preventing the liquid level from becoming too low.

[0038] Specifically, the solid-liquid-gas separator 4 is a baffle plate separator, a cyclone separator, or a packed separator. Preferably, the solid-liquid-gas separator 4 is a baffle plate separator, wherein the baffle plates are arranged at an inclined and staggered manner to separate the gas, liquid, and solid phases through inertial collision.

[0039] Specifically, multiple spray heads 3 are fixedly connected to the spray pipe 6, and the multiple spray heads 3 are evenly distributed above the solid-liquid-gas separator 4.

[0040] In some embodiments, to facilitate adjustment of the liquid level in the demister tank 2, the overflow pipe 13 includes a movable pipe 15 and a fixed pipe 18. The movable pipe 15 and the fixed pipe 18 are slidably and sealingly connected, and a positioning bolt 17 is threaded onto the wall of the movable pipe 15. Specifically, a sealing ring 16 is fixedly connected inside the movable pipe 15. The movable pipe 15 and the fixed pipe 18 are slidably and sealingly connected through the sealing ring 16.

[0041] When it is necessary to adjust the liquid level of the demister tank 2, the height of the movable pipe 15 is slidably adjusted, and the movable pipe 15 is fixed to the fixed pipe 18 by the positioning bolt 17. By adjusting the overflow height, the liquid level of the balance tank 12 and the demister tank 2 can be adjusted.

[0042] To facilitate the cleaning of sludge deposited inside the demister tank 2, a drain pipe 19 is connected to the bottom of one side of the demister tank 2.

[0043] Operational performance verification: Testing showed that the particulate sludge content in the treated biogas decreased from an initial 500 mg / m³ to below 50 mg / m³, with a defoaming efficiency of 90%. The pressure fluctuation range of the desulfurization system remained stable within ±5%, and the desulfurizing agent replacement cycle was extended from 3 months to 6 months; no manual intervention was required throughout the process, reducing operation and maintenance costs by 30%.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biogas defoaming device, characterized in that, include: Demister (2), a solid-liquid-gas separator (4) is fixedly connected to the middle of the demister (2), a spray pipe (6) is provided directly above the solid-liquid-gas separator (4), an air inlet pipe (1) and an air outlet pipe (5) are connected to the top of the demister (2), and one end of the air inlet pipe (1) extends to the bottom of the interior of the demister (2). Balance tank (12), an overflow pipe (13) is fixedly connected inside the balance tank (12), and the balance tank (12) is connected to the bottom end of the demister (2); A water collection tank (14) is provided, with its inlet connected to an overflow pipe (13) and its outlet connected to a liquid pump (10). The outlet of the liquid pump (10) is connected to a spray pipe (6).

2. The biogas defoaming device according to claim 1, characterized in that: The solid-liquid-gas separator (4) has multiple layers, and each layer of the solid-liquid-gas separator (4) is provided with a spray pipe (6) directly above it.

3. The biogas defoaming device according to claim 1, characterized in that: The outlet of the liquid pump (10) is connected to the spray pipe (6) and the drain pipe (8) through a three-way pipe. An electric valve (7) is fixedly connected to the drain pipe (8), and a liquid level switch (9) is fixedly connected inside the water collection tank (14).

4. The biogas defoaming device according to claim 3, characterized in that: There are two liquid level switches (9).

5. A biogas defoaming device according to claim 1, characterized in that: The solid-liquid-gas separator (4) is a baffle plate gas-liquid separator, a cyclone plate gas-liquid separator, or a packed gas-liquid separator.

6. A biogas defoaming device according to claim 1, characterized in that: Multiple spray heads (3) are fixedly connected to the spray pipe (6).

7. A biogas defoaming device according to claim 1, characterized in that: The overflow pipe (13) includes a movable pipe (15) and a fixed pipe (18). The movable pipe (15) and the fixed pipe (18) are slidably sealed together. A positioning bolt (17) is threaded onto the wall of the movable pipe (15).

8. A biogas defoaming device according to claim 7, characterized in that: A sealing ring (16) is fixedly connected inside the movable tube (15).

9. A biogas defoaming device according to claim 1, characterized in that: The liquid level in the demister (2) is lower than the height of the solid-liquid-gas separator (4), and the height of the outlet end of the inlet pipe (1) is lower than the liquid level.

10. A biogas defoaming device according to claim 1, characterized in that: The bottom of one side of the demister (2) is connected to a drain pipe (19).

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