Desulfurization wastewater treatment device for biogas treatment

Abstract

The utility model discloses a desulfurization wastewater treatment device for biogas treatment, which relates to the field of biogas treatment and comprises a feed pipe, one end of the feed pipe is connected with a desulfurization regeneration tower, the other end of the feed pipe is connected with a liquid inlet of a plate-and-frame filter press, and the mounting position of the plate-and-frame filter press is higher than that of a reducing agent inlet of the desulfurization regeneration tower. A liquid outlet of the plate-and-frame filter press is connected with a reducing agent inlet of a slurry pump of the desulfurization regeneration tower through a discharge pipe, and a first normally open valve, a filter and a second normally open valve are sequentially mounted on the discharge pipe; the installation position of the plate-and-frame filter press is higher than the position of the reducing agent inlet of the desulfurization regeneration tower, and the treated reducing agent flows back to the regeneration tower through the discharge pipe under the action of gravity, so that the use of a pump is reduced, the energy is saved, mechanical elements of the system are reduced, and the maintenance difficulty and cost are reduced; gravity flow can provide more stable flow, and the influence of fluctuation on the system is reduced.

Description

Technical Field

[0001] The utility model relates to the field of biogas treatment, in particular to a desulfurization wastewater treatment device for biogas treatment. Background Art

[0002] Biogas is a gas produced by microbial fermentation of organic matter under anaerobic conditions, the main components of which include methane and carbon dioxide. However, biogas often contains some impurities, such as hydrogen sulfide, so biogas needs to be desulfurized.

[0003] The solid desulfurization wastewater generated during the desulfurization process settles in the cone bucket below the desulfurization regeneration tower. The desulfurization wastewater is pumped to the plate and frame filter press through two sulfur slurry pumps. The filter press is composed of a series of filter plates and filter frames arranged alternately, and the filter plates are covered with filter cloth. When the slurry enters the filter frame, the solid matter is trapped on the filter cloth. Through mechanical devices, the filter plate and filter frame are pressed to form a sealed filter chamber. The pump applies pressure to make the liquid pass through the filter cloth, while the solid matter is trapped to form a filter cake. As the filtrate continues to flow out through the filter cloth, the solid matter gradually accumulates to form a filter cake.

[0004] In the prior art, the filtrate flows into a reflux tank, which is equipped with a reflux pump. When the liquid level reaches the set level, the filtrate is pumped back into the desulfurization regeneration tower through the reflux pump. The reflux tank and the reflux pump take up more space. Utility Model Content

[0005] The purpose of the utility model is to provide a desulfurization wastewater treatment device for biogas treatment, which is used to solve the problem in the prior art that the filtrate flows into a reflux tank, and the reflux tank is equipped with a reflux pump. When the liquid level reaches the set liquid level, the filtrate is pumped back into the desulfurization regeneration tower through the reflux pump, and the arrangement of the reflux tank and the reflux pump takes up more space.

[0006] The technical solution adopted by the utility model is as follows: a desulfurization wastewater treatment device for biogas treatment, comprising a feed pipe, one end of the feed pipe is connected to a desulfurization regeneration tower, and the other end is connected to a liquid inlet of a plate and frame filter press, the installation position of the plate and frame filter press is higher than the reducing agent inlet position of the desulfurization regeneration tower, the liquid outlet of the plate and frame filter press is connected to the reducing agent inlet of a slurry pump of the desulfurization regeneration tower through a discharge pipe, a first normally open valve, a filter, and a second normally open valve are sequentially installed on the discharge pipe, a bypass pipe is also arranged between a side of the first normally open valve away from the filter and a side of the second normally open valve away from the filter, and a normally closed valve is installed on the bypass pipe.

[0007] Furthermore, in order to allow the reducing agent to reflux smoothly, the discharge pipe is arranged at an inclination, and the inclination of each meter of the discharge pipe is 1-5%, ensuring that there is a height difference of 1-5 centimeters in a one-meter-long discharge pipe, and a flow meter is also installed on the discharge pipe to facilitate the observation of the controllability of the refluxed reducing agent.

[0008] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0009] 1. The installation position of the plate and frame filter press described in the utility model is higher than the reducing agent inlet position of the desulfurization regeneration tower. The treated reducing agent flows back to the regeneration tower through the discharge pipe under the action of gravity, which reduces the use of pumps, saves energy, reduces the mechanical components of the system, reduces the maintenance difficulty and cost, and gravity flow can provide a more stable flow rate, reducing the impact of fluctuations on the system;

[0010] 2. In order to prevent the impurities of the reducing agent from clogging the discharge pipe, a filter is installed on the discharge pipe to filter the reducing agent. In order to facilitate the normal operation of the equipment during the maintenance of the filter, a bypass pipeline is also installed on the discharge pipe. When the filter is maintained, the first normally open valve and the second normally open valve are closed, and the normally closed valve is opened to allow the reducing agent to temporarily flow back through the bypass pipeline;

[0011] 3. In order to allow the reducing agent to reflux smoothly, the discharge pipe is set at an angle, with an inclination of 1-5% per meter of length, ensuring that there is a height difference of 1-5 cm in a one-meter-long discharge pipe, and a flow meter is also installed on the discharge pipe to improve the controllability of the refluxed reducing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Description of reference numerals:

[0014] 1. Plate and frame filter press; 2. Feed pipe; 3. Discharge pipe; 4. First normally open valve; 5. Filter; 6. Second normally open valve; 7. Bypass pipe; 8. Normally closed valve; 9. Flow meter. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1

[0018] Figure 1 As shown: a desulfurization wastewater treatment device for biogas treatment, including a feed pipe 2, one end of the feed pipe 2 is connected to the desulfurization regeneration tower, and the other end is connected to the liquid inlet of the plate and frame filter press 1, the installation position of the plate and frame filter press 1 is higher than the reducing agent inlet position of the desulfurization regeneration tower, the liquid outlet of the plate and frame filter press 1 is connected to the reducing agent inlet of the desulfurization regeneration tower slurry pump through a discharge pipe 3, and a first normally open valve 4, a filter 5 and a second normally open valve 6 are sequentially installed on the discharge pipe 3, and a bypass pipe 7 is also arranged between the side of the first normally open valve 4 away from the filter 5 and the side of the second normally open valve 6 away from the filter 5, and a normally closed valve 8 is installed on the bypass pipe 7.

[0019] The installation position of the plate and frame filter press 1 is higher than the reducing agent inlet position of the desulfurization regeneration tower. The treated reducing agent is returned to the regeneration tower through the discharge pipe 3 under the action of gravity. In order to prevent the impurities of the reducing agent from clogging the discharge pipe 3, a filter 5 is installed on the discharge pipe 3 to filter the reducing agent. In order to facilitate the normal operation of the equipment during the maintenance of the filter 5, a bypass pipe 7 is also installed on the discharge pipe 3. When the filter 5 is maintained, the first normally open valve 4 and the second normally open valve 6 are closed, and the normally closed valve 8 is opened to allow the reducing agent to temporarily reflux through the bypass pipe 7. After the maintenance is completed, the first normally open valve 4 and the second normally open valve 6 are opened, and the normally closed valve 8 is closed, so that the reducing agent can still reflux through the discharge pipe 3.

[0020] In order to allow the reducing agent to reflux smoothly, the discharge pipe 3 is inclined, and the inclination of each meter of the discharge pipe 3 is 1-5%, ensuring that there is a height difference of 1-5 cm in the one-meter-long discharge pipe 3, and a flow meter 9 is also installed on the discharge pipe 3 to facilitate the observation of the controllability of the refluxed reducing agent.

[0021] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A desulfurization wastewater treatment device for biogas treatment, characterized in that: The invention comprises a feed pipe (2), one end of which is connected to a desulfurization regeneration tower, and the other end of which is connected to a liquid inlet of a plate-frame filter press (1). The installation position of the plate-frame filter press (1) is higher than the reducing agent inlet position of the desulfurization regeneration tower. The liquid outlet of the plate-frame filter press (1) is connected to the reducing agent inlet of a slurry pump of the desulfurization regeneration tower through a discharge pipe (3). A first normally open valve (4), a filter (5) and a second normally open valve (6) are sequentially installed on the discharge pipe (3). A bypass pipe (7) is also arranged between a side of the first normally open valve (4) away from the filter (5) and a side of the second normally open valve (6) away from the filter (5). A normally closed valve (8) is installed on the bypass pipe (7).

2. A desulfurization wastewater treatment device for biogas treatment according to claim 1, characterized in that: The discharge pipe (3) is arranged in an inclined manner.

3. A desulfurization wastewater treatment device for biogas treatment according to claim 2, characterized in that: The discharge pipe (3) has an inclination of 1-5%.

4. A desulfurization wastewater treatment device for biogas treatment according to claim 3, characterized in that: The discharge pipe (3) is also provided with a flow meter (9).

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