Biological desulfurization device with microorganism backup function

Abstract

The utility model discloses a biological desulfurization device with a microorganism backup function. The biological desulfurization device comprises a biological desulfurization tower; the inner upper part of the biological desulfurization tower is provided with a spraying opening, the middle part is provided with a filler layer, and the lower part is provided with a gas channel; the nutrient solution inflow pipe is connected with the spraying opening; the biogas inlet pipe is connected with the gas channel; the air inlet pipe is connected with the gas channel; a gas outlet pipe of the biological desulfurization tower is connected with the top end of the biological desulfurization tower; the nutrient solution discharge pipe is connected with the lower end of the filler layer; a gas outlet pipe of the microorganism backup container is connected with the gas channel; the nutrient solution pool is connected with the nutrient solution inflow pipe; the microorganism backup container is arranged in the nutrient solution pool and is connected with the nutrient solution inflow pipe, the air inlet pipe and the biogas inlet pipe, and the microorganism backup container is connected with the gas outlet pipe of the microorganism backup container. According to the biological desulfurization device with the microorganism backup function disclosed by the utility model, when the activity of desulfurization microorganisms is reduced, system functions can be recovered without re-debugging and re-starting, so that the operation continuity is kept.

Description

Technical Field

[0001] This utility model relates to the field of biological desulfurization technology, and in particular to a biological desulfurization device with microbial backup function. Background Technology

[0002] Biogas is a combustible gas produced by the anaerobic fermentation of organic matter (such as agricultural waste, food waste, and livestock manure) by microorganisms. Its main components are methane (CH4) and carbon dioxide (CO2), along with small amounts of hydrogen sulfide (H2S), nitrogen (N2), oxygen (O2), and other impurities. H2S is highly corrosive, damaging pipes, valves, burners, and other related equipment, increasing maintenance costs. Furthermore, H2S is a toxic gas, harmful and even fatal to humans at high concentrations. Therefore, removing H2S from biogas is a crucial step in biogas purification. Biological desulfurization refers to the process of converting H2S into harmless sulfates or other stable forms using specific types of microorganisms (mainly autotrophic bacteria, such as Thiobacillus denitrificans and Thiobacillus thioparus).

[0003] Reduced activity of desulfurizing microorganisms in biogas projects is a common problem during operation and maintenance. Many factors can affect the activity of these microorganisms, such as discrepancies between the current biogas processing volume or composition and the design conditions, or excessively low pH and temperature in the nutrient solution tank, potentially leading to system failure. Chinese utility model patent application number 2021232655411 discloses a biological desulfurization system. This system includes a desulfurization reaction tank and a desulfurizing bacteria cultivation tank. The desulfurization reaction tank receives gas containing hydrogen sulfide, and the desulfurizing bacteria cultivation tank is connected to the desulfurization reaction tank and cultivates desulfurizing bacteria. The desulfurization reaction tank includes a desulfurization reaction zone containing at least one desulfurization layer and at least one support layer, stacked in an alternating manner. When the activity of these desulfurizing microorganisms decreases, system function needs to be restored through restarting and recalibration. This restart process is typically time-consuming, impacting the normal operation of the project. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a biological desulfurization device with microbial backup function. When the activity of desulfurization microorganisms decreases, there is no need to restart the system to restore its function, thus maintaining operational continuity.

[0005] The purpose of this utility model is achieved in the following manner: a biological desulfurization device with microbial backup function, comprising:

[0006] Biological desulfurization tower;

[0007] The biological desulfurization tower has a spray nozzle at the top, a packing layer in the middle, and a gas channel at the bottom.

[0008] The nutrient solution inlet pipe is connected to the spray nozzle;

[0009] A biogas inlet pipe is connected to the gas passage.

[0010] An air intake pipe is connected to the gas passage.

[0011] The gas outlet pipe of the biological desulfurization tower is connected to the top of the biological desulfurization tower;

[0012] A nutrient solution return pipe is connected to the lower end of the packing layer;

[0013] The vent pipe of the microbial backup container is connected to the gas channel;

[0014] A nutrient solution tank is connected to the nutrient solution inflow pipe at the other end of the spray nozzle;

[0015] A microbial backup container is disposed in the nutrient solution tank, connected to the nutrient solution inflow pipe at the other end of the spray port, connected to the air inlet pipe, and connected to the microbial backup container outlet pipe at the other end of the gas channel.

[0016] As an optional solution to the technical solution of this utility model, it also includes:

[0017] An air splitter pipe is connected to the air intake pipe;

[0018] A biogas distribution pipe is connected to the biogas inlet pipe;

[0019] The air splitter pipe is connected to the biogas splitter pipe;

[0020] The air inlet pipe of the microbial backup container is connected at one end to the air diversion pipe and the biogas diversion pipe, and at the other end to the microbial backup container.

[0021] As an optional solution to the technical solution of this utility model, it also includes:

[0022] The nutrient solution return pipe has one end connected to the nutrient solution inflow pipe and the other end connected to one side of the bottom of the nutrient solution tank.

[0023] The microbial reflux tube is connected at one end to the nutrient solution inflow tube and at the other end to the bottom side of the microbial backup container.

[0024] As an optional solution to the technical solution of this utility model, it also includes:

[0025] The nutrient solution discharge branch pipe is connected at one end to the nutrient solution return pipe and at the other end to the nutrient solution tank.

[0026] As an optional solution of this utility model, the nutrient solution tank is equipped with a pH meter for detecting the pH value in the nutrient solution tank.

[0027] As an optional solution of this utility model, a delivery pump is provided on the nutrient solution inflow pipe.

[0028] As an optional solution of the present invention, the nutrient solution return pipe is provided with a first valve.

[0029] As an optional solution to the technical solution of this utility model, a second valve is provided on the microbial reflux pipe.

[0030] As an optional solution to the present invention, a third valve is provided between the nutrient solution discharge pipe and the microbial backup container;

[0031] A fourth valve is installed on the nutrient solution discharge branch pipe.

[0032] As an optional solution to the technical solution of this utility model, an air intake fan is provided on the air intake pipe.

[0033] The beneficial effects of this utility model are:

[0034] This invention relates to a biological desulfurization tower with microbial backup function. The packing layer surface is covered with a large number of desulfurization microorganisms. Hydrogen sulfide-containing biogas and air enter the biological desulfurization tower through its gas channel in a certain ratio. During desulfurization, nutrient solution is continuously drawn from the nutrient solution tank to the spray nozzle at the top of the biological desulfurization tower to provide the microorganisms with the nutrients needed for growth. The gas, after being treated by the desulfurization microorganisms in the packing layer, is discharged through the biological desulfurization tower's outlet pipe for later use. The nutrient solution is discharged from the bottom of the biological desulfurization tower and stored in the nutrient solution tank. During the cultivation of backup microorganisms, the microbial backup container periodically provides the microorganisms with anaerobic biogas containing sulfur substrate and air through its inlet pipe. The gas returns to the gas channel through the outlet pipe of the microbial backup container. The nutrient solution containing microorganisms in the microbial backup container enters the spray nozzle through the microbial return pipe and the nutrient solution inlet pipe. The gas generated in the microbial backup container enters the gas channel through its outlet pipe. Through these technical means, when the activity of the desulfurization microorganisms decreases, there is no need to restart the system to restore its function, maintaining operational continuity. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments 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.

[0036] Figure 1 This is a schematic diagram of a biological desulfurization device with microbial backup function according to Embodiment 1 of this utility model.

[0037] Figure label:

[0038] 1. Microbial backup container; 2. Nutrient solution tank; 3. Microbial backup container; 4. Nutrient solution output branch pipe; 5. pH meter; 6. Transfer pump; 7. Microbial backup container gas outlet pipe; 8. Biological desulfurization tower; 801. Spray nozzle; 802. Packing layer; 803. Gas channel; 9. Microbial backup container air inlet pipe; 10. Nutrient solution inflow pipe; 11. Third valve; 12. Fourth valve; 13. Second valve; 14. First valve; 15. Nutrient solution return pipe; 16. Air diversion pipe; 17. Biogas diversion pipe; 18. Biogas inlet pipe; 19. Air intake fan; 20. Nutrient solution discharge pipe; 21. Air inlet pipe; 22. Biological desulfurization tower gas outlet pipe. Detailed Implementation

[0039] 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.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] In the description of the embodiments, unless otherwise expressly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Example 1

[0043] like Figure 1As shown, a biological desulfurization device with microbial backup function includes a biological desulfurization tower 8. The upper part of the biological desulfurization tower 8 has a spray port 801, the middle part has a packing layer 802, and the lower part of the packing layer 802 has a gas channel 803. A nutrient solution inflow pipe 10 is connected to the spray port 801; a biogas inlet pipe 18 is connected to the gas channel 803; an air inlet pipe 21 is connected to the gas channel 803; a biological desulfurization tower outlet pipe 22 is connected to the top of the biological desulfurization tower 8; a nutrient solution discharge pipe 20 is connected to the lower end of the packing layer 802; a microbial backup container outlet pipe 7 is connected to the gas channel 803; a nutrient solution tank 2 is connected to the nutrient solution inflow pipe 10 at the other end relative to the spray port 801; a microbial backup container 1 is located in the nutrient solution tank 2, connected to the nutrient solution inflow pipe 10 at the other end relative to the spray port 801, connected to the air inlet pipe 21, and connected to the microbial backup container outlet pipe 7 at the other end relative to the gas channel 803. Air enters gas channel 803 through air inlet pipe 21; anaerobic biogas enters gas channel 803 through biogas inlet pipe 18; desulfurized gas is discharged through biological desulfurization tower outlet pipe 22; gas generated in microbial backup container 1 enters gas channel 803 through microbial backup container outlet pipe 7; nutrient solution in biological desulfurization tower 8 enters microbial backup container 1 through nutrient solution discharge pipe 20; microbial nutrient solution in microbial backup container 1 enters spray port 801 through nutrient solution inlet pipe 10; nutrient solution in nutrient solution pool 2 enters spray port 801 through nutrient solution inlet pipe 10.

[0044] like Figure 1 As shown, a biological desulfurization device with microbial backup function also includes: an air diversion pipe 16, a biogas diversion pipe 17, and a microbial backup container inlet pipe 9. These components are connected as follows: the air diversion pipe 16 is connected to the air inlet pipe 21; the biogas diversion pipe 17 is connected to the biogas inlet pipe 18; the air diversion pipe 16 is connected to the biogas diversion pipe 17; one end of the microbial backup container inlet pipe 9 is connected to the air diversion pipe 16 and the biogas diversion pipe 17, and the other end is connected to the microbial backup container 1. Air enters the microbial backup container 1 through the inlet pipe 21, the air diversion pipe 16, and the microbial backup container inlet pipe 9; anaerobic biogas enters the microbial backup container 1 through the biogas inlet pipe 18, the biogas diversion pipe 17, and the microbial backup container inlet pipe 9.

[0045] like Figure 1As shown, a biological desulfurization device with microbial backup function also includes: a nutrient solution return pipe 15 and a microbial return pipe 3. These components are connected as follows: one end of the nutrient solution return pipe 15 is connected to the nutrient solution inflow pipe 10, and the other end is connected to one side of the bottom of the nutrient solution tank 2; one end of the microbial return pipe 3 is connected to the nutrient solution inflow pipe 10, and the other end is connected to one side of the bottom of the microbial backup container 1. The nutrient solution in the nutrient solution tank 2 enters the spray port 801 through the nutrient solution return pipe 15 and the nutrient solution inflow pipe 10; the microbial-containing nutrient solution in the microbial backup container 1 enters the spray port 801 through the microbial return pipe 3 and the nutrient solution inflow pipe 10.

[0046] like Figure 1 As shown, a biological desulfurization device with microbial backup function also includes: a nutrient solution discharge branch pipe 4, one end of which is connected to a nutrient solution discharge pipe 20, and the other end is connected to a nutrient solution tank 2. The nutrient solution in the biological desulfurization tower 8 enters the nutrient solution tank 2 through the nutrient solution discharge pipe 20 and the nutrient solution discharge branch pipe 4.

[0047] like Figure 1 As shown, a pH meter 5 is installed on the nutrient solution tank 2 to detect the pH value in the nutrient solution tank 2.

[0048] like Figure 1 As shown, a delivery pump 6 is provided on the nutrient solution inflow pipe 10, which is used to transport the liquid in the microbial backup container 1 and the nutrient solution pool 2 to the biological desulfurization tower 8.

[0049] like Figure 1 As shown, in order to control the opening and closing of the nutrient solution return pipe 15, a first valve 14 is provided on the nutrient solution return pipe 15.

[0050] like Figure 1 As shown, in order to control the opening and closing of the microbial reflux pipe 3, a second valve 13 is provided on the microbial reflux pipe 3.

[0051] like Figure 1 As shown, a third valve 11 is provided between the nutrient solution discharge pipe 20 and the microbial backup container 1; a fourth valve 12 is provided on the nutrient solution discharge branch pipe 4.

[0052] like Figure 1 As shown, an air intake fan 19 is provided on the air intake pipe 21 to supply air to the biological desulfurization tower 8 and the microbial backup container 1.

[0053] The working principle of this embodiment:

[0054] A large number of desulfurization microorganisms are attached to the surface of the packing layer 802 of the biological desulfurization tower 8. Hydrogen sulfide biogas and air enter the biological desulfurization tower 8 through the gas channel 803 in a certain proportion. During the desulfurization process, nutrient solution needs to be continuously drawn from the nutrient solution tank 2 to the spray port 801 above the biological desulfurization tower to provide nutrients for the growth of microorganisms. After the gas is treated by the desulfurization microorganisms in the packing layer 802, it is discharged from the biological desulfurization tower outlet pipe 22 of the biological desulfurization tower 8 for use at the rear end. The nutrient solution is discharged from the bottom of the biological desulfurization tower and stored in the nutrient solution tank 2. When the microbial backup container 1 is cultivating backup microorganisms, it is periodically supplied with anaerobic biogas-containing sulfur substrate and air from the microbial backup container inlet pipe 9. The gas returns to the gas channel 803 through the microbial backup container outlet pipe 7. The microbial nutrient solution in the microbial backup container 1 enters the spray port 801 through the microbial return pipe 3 and the nutrient solution inlet pipe 10. The gas generated in the microbial backup container 1 enters the gas channel 803 through the microbial backup container outlet pipe 7.

[0055] The workflow of this embodiment:

[0056] When the desulfurization effect is normal and the pH value of pH meter 5 on nutrient solution tank 2 is between 6 and 7, close the fourth valve 12 and open the third valve 11, allowing the nutrient solution in the biological desulfurization tower 8 to flow into the microbial backup container 1. At this time, the desulfurization microorganisms have the best activity until the microbial backup container 1 is full. Then, close valve 11 and open valve 12, and the nutrient solution in the biological desulfurization tower 8 is discharged into the nutrient solution tank 2 by gravity. Then, after the nutrient solution in the nutrient solution tank 2 is adjusted, open the first valve 14, and the nutrient solution is transported to the spray port 801 by the transfer pump 6.

[0057] When the pH value of pH meter 5 on nutrient solution tank 2 is lower than 3, it indicates that the activity of desulfurization microorganisms in biological desulfurization tower 8 is low, and the system is facing collapse. The first valve 14 is closed, and the second valve 13 is opened. The desulfurization microbial nutrient solution in microbial backup container 1 is transported to spray port 801 of microbial backup tower 8 via pump 6. Then, the sulfur-containing nutrient solution is discharged back into microbial backup container 1 by gravity. During system recovery, the system pH value is closely monitored to ensure stable system operation.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A biological desulfurization device with microbial backup function, characterized in that, It comprises: a biological desulfurization tower (8); a spray nozzle (801) is arranged at the upper part of the biological desulfurization tower (8), a filler layer (802) is arranged at the middle part, and a gas passage (803) is arranged at the lower part; a nutrient liquid inflow pipe (10) connected with the spray nozzle (801); a biogas inlet pipe (18) connected with the gas passage (803); an air inlet pipe (21) connected with the gas passage (803); a biological desulfurization tower outlet pipe (22) connected with the top end of the biological desulfurization tower (8); a nutrient liquid discharge pipe (20) connected with the lower end of the filler layer (802); a microbial backup container outlet pipe (7) connected with the gas passage (803); a nutrient liquid pool (2) connected with the nutrient liquid inflow pipe (10) at the other end relative to the spray nozzle (801); a microbial backup container (1) arranged in the nutrient liquid pool (2) and connected with the nutrient liquid inflow pipe (10) at the other end relative to the spray nozzle (801), the air inlet pipe (21), and the microbial backup container outlet pipe (7) at the other end relative to the gas passage (803).

2. The biological desulfurization device with a microbial backup function according to claim 1, characterized by It further comprises: an air shunt pipe (16) in communication with the air inlet pipe (21); a biogas shunt pipe (17) in communication with the biogas inlet pipe (18); the air shunt pipe (16) is in communication with the biogas shunt pipe (17); a microbial backup container inlet pipe (9) having one end in communication with the air shunt pipe (16) and the biogas shunt pipe (17) and the other end connected with the microbial backup container (1).

3. The biological desulfurization device with a microbial backup function according to claim 1, characterized by It further comprises: a nutrient liquid return pipe (15) having one end in communication with the nutrient liquid inflow pipe (10) and the other end connected with one side of the bottom of the nutrient liquid pool (2); a microbial return pipe (3) having one end in communication with the nutrient liquid inflow pipe (10) and the other end connected with one side of the bottom of the microbial backup container (1).

4. The biological desulfurization device with a microbial backup function according to claim 1, characterized by It further comprises: a nutrient liquid discharge branch pipe (4) having one end in communication with the nutrient liquid discharge pipe (20) and the other end connected with the nutrient liquid pool (2).

5. The biological desulfurization device with a microbial backup function according to claim 1, characterized by A pH meter (5) is arranged on the nutrient liquid pool (2) for detecting the pH value in the nutrient liquid pool (2).

6. The biological desulfurization device with a microbial backup function according to claim 1, characterized by A delivery pump (6) is arranged on the nutrient liquid inflow pipe (10).

7. The biological desulfurization device with a microbial backup function according to claim 3, characterized by A first valve (14) is arranged on the nutrient liquid return pipe (15).

8. The biological desulfurization device with a microbial backup function according to claim 3, characterized by A second valve (13) is arranged on the microbial return pipe (3).

9. The biological desulfurization device with a microbial backup function according to claim 4, characterized by A third valve (11) is arranged between the nutrient liquid discharge pipe (20) and the microbial backup container (1). A fourth valve (12) is arranged on the nutrient liquid discharge branch pipe (4).

10. The biological desulfurization device with a microbial backup function according to claim 1, characterized by An air inlet fan (19) is arranged on the air inlet pipe (21).

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