Biogas pretreatment system

Abstract

The utility model discloses a biogas pretreatment system, and belongs to the technical field of biogas treatment. Biogas can enter any one gas inlet pipe through the main pipe, a desulfurizing agent can be in contact with the biogas so as to desulfurize the biogas, and by arranging the two desulfurizing towers, when the desulfurizing agent in the desulfurizing pool in one desulfurizing tower needs to be replaced, the other desulfurizing tower can be used for desulfurizing the biogas, so that the two desulfurizing towers are alternately used, and the efficiency of biogas desulfurization is not influenced.

Description

Technical Field

[0001] The present application relates to the technical field of biogas treatment, and in particular to a biogas pretreatment system. Background Art

[0002] Biogas, as the name implies, is the gas in swamp wetlands. Biogas is combustible and belongs to secondary energy, and is a renewable energy with a wide range of uses. After biogas is produced, it contains a lot of impurities and cannot be used directly, so biogas needs to be pre-processed and purified through processes such as desulfurization, filtration, and water removal.

[0003] In the prior art, a desulfurization tank is usually arranged in a desulfurization tower, in which a desulfurizer for desulfurizing biogas is placed. Biogas is introduced into the desulfurizer through an air inlet pipe so that the biogas and the desulfurizer are in contact with each other for desulfurization treatment. The desulfurized biogas can leave the desulfurization tower through an air outlet pipe on the desulfurization tower. When the desulfurizer is saturated, the desulfurizer needs to be replaced. However, during the replacement of the desulfurizer, the air inlet pipe needs to stop introducing biogas, which affects work efficiency. Utility Model Content

[0004] The purpose of this application is to propose a biogas pretreatment system in view of the above-mentioned problems existing in the prior art.

[0005] The present application can be implemented through the following technical scheme: a biogas pretreatment system, including two desulfurization towers, wherein the desulfurization towers are provided with desulfurization tanks, wherein a desulfurizer capable of contacting biogas is placed in the desulfurization tanks, wherein the desulfurization tanks are connected to a liquid inlet pipe and a liquid outlet pipe, and the desulfurization towers are provided with an air inlet pipe connected to the interior of the desulfurization tanks and an air outlet pipe located above the air inlet pipe, wherein both the air inlet pipe and the air outlet pipe can be connected to the interior and the exterior of the desulfurization towers, wherein the two air inlet pipes are connected to the same main pipe, and each air inlet pipe is equipped with a valve, wherein the main pipe and the air inlet pipe are both used for passing biogas, and the air outlet pipe is used for supplying desulfurized biogas to leave the desulfurization towers.

[0006] In the above technical solution, biogas can enter any air inlet pipe through the main pipe, and the desulfurizer can contact the biogas to desulfurize the biogas. By setting up two desulfurization towers, when the desulfurizer in the desulfurization tank in one desulfurization tower needs to be replaced, the other desulfurization tower can be used to desulfurize the biogas, so that the two desulfurization towers can be used alternately without affecting the efficiency of biogas desulfurization.

[0007] Furthermore, a concave surface is formed on the inner bottom surface of the desulfurization tank, and the liquid outlet pipe is located at the lowest point of the concave surface.

[0008] In the above technical solution, the concave surface allows the desulfurizer to flow out through the liquid outlet pipe more fully.

[0009] Furthermore, the desulfurization tank is provided with stirring blades for stirring the desulfurizer.

[0010] In the above technical solution, the stirring blades can stir the desulfurizer, so that the biogas and the desulfurizer are fully and evenly contacted, thereby improving the desulfurization efficiency.

[0011] Furthermore, a heater for heating the desulfurizing agent is installed in the desulfurization tank.

[0012] In the above technical solution, when the ambient temperature is low, the temperature of the desulfurizer will decrease, thereby affecting the reaction rate of the desulfurizer and biogas. The desulfurizer is heated by setting a heater so that the temperature of the desulfurizer can reach the temperature required for the optimal reaction rate.

[0013] Furthermore, a filter screen 1 is provided in the air inlet pipe, and the filter screen 1 is used to filter solid impurities in the biogas.

[0014] In the above technical solution, solid impurity particles entering the desulfurizer will hinder the effective contact between biogas and the desulfurizer. Filter 1 can filter the solid impurity particles in the biogas, thereby reducing the possibility of solid impurity particles entering the desulfurization tank.

[0015] Furthermore, two filters are provided in the air intake pipe for allowing biogas to pass through, and desiccant is placed between the two filters. A barrel is provided above and below the air intake pipe, and the two barrels are connected to the inside of the air intake pipe through a pipe. A valve is provided on the pipe for allowing desiccant to pass through.

[0016] In the above technical scheme, biogas can enter the desulfurization tower through two filter screens 2, and desiccant can be placed between the two filter screens 2. The desiccant can dry the biogas. By setting two barrels and valve 2, the barrel located above the air inlet pipe can store new desiccant, and the barrel located below the air inlet pipe can be used to place saturated desiccant. By opening valve 2 below the air inlet pipe, the used desiccant in the air inlet pipe can fall into the barrel below the air inlet pipe. By opening valve 2 above the air inlet pipe, the desiccant in the barrel above the air inlet pipe can fall into the air inlet pipe, which is convenient for replacing the desiccant.

[0017] Furthermore, the barrel is connected to the pipeline via threads.

[0018] In the above technical solution, the barrel is connected to the pipeline through threads, so that when the desiccant in the barrel is used up or filled up, the barrel can be directly unscrewed from the pipeline and then replaced, which is more convenient.

[0019] Furthermore, it also includes a dust suction end, which moves linearly along a surface of the filter screen through a driving device to remove solid impurities on the surface of the filter screen.

[0020] In the above technical solution, the dust suction end can be used to suck out solid impurity particles on the surface of the filter screen 1, thereby cleaning the filter screen 1 and preventing the filter screen 1 from being blocked.

[0021] To sum up, the present application has the following technical effects: biogas can enter any air inlet pipe through the main pipe, the desulfurizer can contact the biogas to desulfurize the biogas, and by setting up two desulfurization towers, when the desulfurizer in the desulfurization tank in one desulfurization tower needs to be replaced, the other desulfurization tower can be used to desulfurize the biogas, so that the two desulfurization towers can be used alternately without affecting the efficiency of biogas desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of this application;

[0023] Figure 2 It is a cross-sectional view of the desulfurization tower in this application.

[0024] Description of reference numerals:

[0025] 1. Desulfurization tower; 2. Desulfurization tank; 21. Concave surface; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Air inlet pipe; 6. Air outlet pipe; 7. Main pipe; 8. Valve 1; 9. Stirring blade; 10. Heater; 11. Filter 1; 12. Filter 2; 13. Barrel; 14. Pipeline; 15. Valve 2; 16. Dust suction end; 17. Hose; 18. Drive device; 19. Motor. DETAILED DESCRIPTION

[0026] Please refer to the attached drawings in the instruction manual. Figure 1 and Figure 2One embodiment of the present application provides a biogas pretreatment system, including two desulfurization towers 1 for desulfurizing biogas, each desulfurization tower 1 is equipped with an air inlet pipe 5 and an air outlet pipe 6, the air inlet pipe 5 and the air outlet pipe 6 can be connected to the inside and outside of the desulfurization tower 1, and the air outlet pipe 6 is located at the top of the desulfurization tower 1. The two air inlet pipes 5 are connected to the same main pipe 7, the main pipe 7 is located outside the desulfurization tower 1, each air inlet pipe 5 is provided with a valve 8, the main pipe 7 and the air inlet pipe 5 are used to supply biogas into the desulfurization tower 1. A desulfurization tank 2 is installed in the desulfurization tower 1, and a desulfurizer is placed in the desulfurization tank 2. The air inlet pipe 5 can extend into the desulfurizer so that the desulfurizer can contact the biogas. An inlet pipe 3 and an outlet pipe 4 are installed on the desulfurization tank 2. The inlet pipe 3 and the outlet pipe 4 are both connected to the outside of the desulfurization tower 1 and the inside of the desulfurization tank 2. The bottom surface of the desulfurization tank 2 is formed with a concave surface 21, and the outlet pipe 4 is located at the lowest point of the concave surface 21. The desulfurizer is a complex iron solution. After the biogas enters the desulfurization tower 1 through the air inlet pipe 5, it can contact with the desulfurizer for desulfurization. The desulfurizer will reach saturation after a period of use. The inlet pipe 3 and the outlet pipe 4 are provided to facilitate the replacement of the desulfurizer. By setting up two desulfurization towers 1, when the desulfurizer in one desulfurization tower 1 reaches saturation, the valve 8 installed on the air inlet pipe 5 connected to the desulfurization tower 1 can be closed, and the other valve 8 can be opened to use the other desulfurization tower 1 for desulfurization operation, so as to avoid affecting the desulfurization process of biogas during the replacement of the desulfurizer. Among them, a valve 3 is installed on the outlet pipe 6. After the biogas desulfurization is completed, the valve 3 can be opened to discharge the biogas from the outlet pipe 6.

[0027] Please refer to the attached drawings in the instruction manual. Figure 1 and Figure 2 The bottom of the desulfurization tank 2 is rotatably sealed and connected with two stirring blades 9, which are driven to rotate by a motor 19. The stirring blades 9 are used to stir the desulfurizer, so that the biogas and the desulfurizer are fully and evenly contacted, thereby improving the desulfurization efficiency. A heater 10 for heating the desulfurizer is also installed in the desulfurization tank 2. The heater 10 is annular, and the heater 10 is arranged around the inner wall of the desulfurization tank 2. When the ambient temperature is low, the temperature of the desulfurizer will decrease, thereby affecting the reaction rate of the desulfurizer and the biogas. The heater 10 is arranged to heat the desulfurizer so that the temperature of the desulfurizer reaches the temperature required for the optimal reaction rate.

[0028] Please refer to the attached drawings in the instruction manual. Figure 1 and Figure 2, a filter screen 11 is installed in the air intake pipe 5. Biogas usually contains a large amount of solid particle impurities. The filter screen 11 is used to filter the solid particle impurities in the biogas. Two filter screens 12 for biogas to pass through are also installed in the air intake pipe 5. The two filter screens 12 are located on the side of the filter screen 11 close to the desulfurization tower 1. The two filter screens 12 can allow biogas to pass through. A desiccant is placed between the two filter screens 12. The desiccant is solid and can be a silica gel drying ball. The desiccant is used to dry biogas. A barrel 13 is placed above and below the air intake pipe 5. The barrel 13 below the air intake pipe 5 is used to collect the used desiccant, and the barrel 13 above the air intake pipe 5 is used to place new desiccant. The two barrels 13 are connected to the inside of the air intake pipe 5 through a pipe 14. The pipe 14 is integrally formed with the air intake pipe 5. The barrel 13 and the pipe 14 are connected by threads. A valve 2 15 is provided on both pipes 14. The valve 2 15 above the air inlet pipe 5 can be opened to allow new desiccant to fall into the air inlet pipe 5 and be located between the two filters, and the valve 2 15 below the air inlet pipe 5 can be opened to allow saturated desiccant to fall into the barrel 13 below the air inlet pipe 5. This design facilitates the replacement of desiccant.

[0029] Please refer to the attached drawings in the instruction manual. Figure 1 and Figure 2 A dust suction end 16 is provided beside the filter screen 11, and the dust suction end 16 is embedded on the inner wall of the intake pipe 5. The dust suction end 16 can be connected to a vacuum cleaner through a hose 17. A hole for the hose 17 to pass through is provided on the intake pipe 5. The hose 17 is connected to the intake pipe 5 in a sliding and sealing manner. The dust suction end 16 is driven by a driving device 18 to move linearly along the surface of the filter screen 11 to remove the solid impurities filtered by the filter screen 11. The driving device 18 can be an electric push rod, a hydraulic cylinder, or other actuators capable of telescopic movement. When the valve 8 is closed, the dust suction end 16 can be used to clean the filter screen 11. The barrel 13 is threadedly connected to the pipe 14. When the desiccant in the barrel 13 is exhausted or filled, the barrel 13 can be directly unscrewed from the pipe 14 and then replaced, which is more convenient.

[0030] The working principle of this embodiment is as follows: a valve 8 is opened, and the biogas passes through a filter 11 and a desiccant in sequence and enters the desulfurization tower 1, and then the biogas contacts the desulfurizer for desulfurization, and the desulfurized biogas can leave the desulfurization tower 1 through the outlet pipe 6.

[0031] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A biogas pretreatment system, characterized in that: The invention comprises two desulfurization towers (1), wherein a desulfurization tank (2) is arranged in the desulfurization tower (1), a desulfurization agent capable of contacting biogas is placed in the desulfurization tank (2), the desulfurization tank (2) is connected to a liquid inlet pipe (3) and a liquid outlet pipe (4), the desulfurization tower (1) is provided with an air inlet pipe (5) connected to the inside of the desulfurization tank (2) and an air outlet pipe (6) located above the air inlet pipe (5), the air inlet pipe (5) and the air outlet pipe (6) are both capable of connecting to the inside and outside of the desulfurization tower (1), the two air inlet pipes (5) are connected to the same main pipe (7), each air inlet pipe (5) is provided with a valve (8), the main pipe (7) and the air inlet pipe (5) are both used for passing biogas, and the air outlet pipe (6) is used for allowing the desulfurized biogas to leave the desulfurization tower (1).

2. A biogas pretreatment system according to claim 1, characterized in that: The inner bottom surface of the desulfurization tank (2) is formed with a concave surface (21), and the liquid outlet pipe (4) is located at the lowest point of the concave surface (21).

3. A biogas pretreatment system according to claim 1, characterized in that: The desulfurization tank (2) is provided with a stirring blade (9) for stirring the desulfurization agent.

4. A biogas pretreatment system according to claim 1, characterized in that: A heater (10) for heating the desulfurizing agent is installed in the desulfurization tank (2).

5. A biogas pretreatment system according to claim 1, characterized in that: A filter screen (11) is provided in the air inlet pipe (5), and the filter screen (11) is used to filter solid impurities in the biogas.

6. A biogas pretreatment system according to claim 1, characterized in that: Two filter screens (12) for passing biogas are arranged in the air intake pipe (5), and a desiccant is placed between the two filter screens (12). A barrel (13) is arranged above and below the air intake pipe (5), and the two barrels (13) are connected to the inside of the air intake pipe (5) through a pipe (14). A valve (15) for passing the desiccant is arranged on the pipe (14).

7. A biogas pretreatment system according to claim 6, characterized in that: The barrel (13) is connected to the pipeline (14) via threads.

8. The biogas pretreatment system according to claim 5, characterized in that: It also comprises a dust suction end (16), wherein the dust suction end (16) moves linearly along the surface of the filter screen (11) through a driving device (18) to remove solid impurities on the surface of the filter screen (11).

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