CN214973049U

CN214973049U - Device for removing hydrogen sulfide in biogas by air stripping

Info

Publication number: CN214973049U
Application number: CN202120444535.3U
Authority: CN
Inventors: 李剑; 李铮; 李洪燕
Original assignee: Beijing Xituolianhe Environmental Engineering Co ltd
Current assignee: Beijing Xituolianhe Environmental Engineering Co ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-12-03
Anticipated expiration: 2031-03-01

Abstract

The utility model discloses a device for removing hydrogen sulfide in marsh gas by air stripping, the device comprises: the reaction tank is internally provided with an air stripping device; the air stripping device comprises: the air stripping pipeline is arranged on the inner side of the upper part of the tank body of the reaction tank. By the device, a novel desulfurization device and a novel desulfurization method are provided; the device has simple structure, reduces the cost and the technical operation difficulty; removing hydrogen sulfide by adopting a tank desulfurization mode; the blowing-off medium in the tank adopts air; the proportion of air for stripping is 4-8% of the proportion of methane produced by the fermentation tank; the air pipelines are uniformly distributed in the tank.

Description

Device for removing hydrogen sulfide in biogas by air stripping

Technical Field

The utility model belongs to marsh gas desulfurization field, in particular to a device for removing hydrogen sulfide in marsh gas by air stripping.

Background

Biogas is a novel energy source which is being vigorously developed in China at present, and organic matters (industrial wastewater, plant straws, animal wastes and the like) are decomposed and metabolized by various microorganisms with various types, large quantity and different functions under certain moisture, temperature and anaerobic conditions to finally form mixed gases of methane, carbon dioxide and the like: biogas, a complex biochemical process. The production of methane is accompanied with the generation of a large amount of hydrogen sulfide, which is a toxic gas, and adverse reactions are caused after the human body inhales, so that serious people have life risks. Moreover, under aerobic and damp heat conditions, hydrogen sulfide can corrode pipelines and combustion equipment. Therefore, many researchers have been devoted to the research of the biogas desulfurization technology.

In the prior art, the problems of complicated structure, high cost, huge equipment, large investment and high operation technical requirement of a desulfurization device often exist.

Disclosure of Invention

To the above-mentioned technical problem among the correlation technique, the utility model provides an air blows off and gets rid of device of hydrogen sulfide among the marsh gas can overcome prior art's the above-mentioned not enough.

In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:

an apparatus for removing hydrogen sulfide from biogas by air stripping, the apparatus comprising: the reaction tank is internally provided with an air stripping device; the air stripping device comprises: the air stripping pipeline is arranged on the inner side of the upper part of the tank body of the reaction tank.

Further, the reaction tank is a CSTR anaerobic reaction tank.

Further, the air stripping pipeline on the inner side of the upper part of the tank body is divided into a plurality of branch pipelines.

Furthermore, a metering device, an air pump and a switch valve are respectively arranged on the part of the main pipeline of the air stripping pipeline, which is arranged outside the reaction tank.

Further, the reaction tank comprises a tank top, and the tank top is arranged on the upper portion of the tank body.

Furthermore, a stand is arranged at the lower part of the air pump.

Furthermore, the branch pipelines are uniformly distributed on the inner side of the upper part of the tank body, and air outlets are arranged on the branch pipelines.

The utility model has the advantages that: by the device, a novel desulfurization device and a novel desulfurization method are provided; the device has simple structure, reduces the cost and the technical operation difficulty; removing hydrogen sulfide by adopting a tank desulfurization mode; the blowing-off medium in the tank adopts air; the proportion of air for stripping is 4-8% of the proportion of methane produced by the fermentation tank; the air pipelines are uniformly distributed in the tank.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a device for removing hydrogen sulfide in biogas by air stripping according to an embodiment of the present invention;

fig. 2 shows a schematic view of a part of the structure of an air stripping device according to an embodiment of the present invention;

fig. 3 shows a schematic view of a part of the structure of an air stripping pipe according to an embodiment of the present invention;

fig. 4 shows a flow chart of a method for removing hydrogen sulfide in biogas by air stripping according to an embodiment of the present invention.

In the figure: 1. the device comprises a reaction tank, 101, a tank body, 102, a tank top, 2, an air pump, 3, a metering device, 4, an air stripping pipeline, 401, a branch pipeline, 402, a main pipeline, 5 and a stand.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, an apparatus for removing hydrogen sulfide from biogas by air stripping comprises: the reaction tank 1 is internally provided with an air stripping device; the air stripping device comprises: and an air stripping pipe 4 installed inside the upper part of the tank body 101 of the reaction tank 1. The air stripping pipeline 4 is arranged on the inner wall of the upper part of the tank body 101 and surrounds the inner wall for a circle. The air stripping pipe 4 is divided into a plurality of branch pipes 401 which are evenly and equidistantly arranged on a main pipe 402 on the inner wall of the tank body 101.

In some embodiments of the present invention, the reaction tank 1 is a CSTR anaerobic reaction tank, wherein CSTR represents a total mixed anaerobic reactor.

In some embodiments of the present invention, as shown in fig. 2, the outside of the reaction tank 1 is provided with a metering device 3, an air pump 2 and a switch valve on the main pipe 402 of the air stripping pipe 4, the metering device 3 is used for measuring air pressure, flow and temperature, and the air pump 2 is used for pumping air and controlling air flow.

In some embodiments of the present invention, as shown in fig. 3, the air stripping pipe 4 inside the upper part of the tank 101 is divided into a plurality of branch pipes 401.

In some embodiments of the present invention, the reaction tank 1 includes a tank top 102, and the tank top 102 is installed on the upper portion of the tank body 101. The reaction tank 1 comprises a tank body 101 and a tank top 102 and is of a closed structure.

In some embodiments of the present invention, the air pump 2 is provided with a stand 5 at the lower part, and the stand 5 is used for supporting the air pump 2 and the main pipe 402.

In some embodiments of the utility model, lateral conduit 401 is in the inboard evenly distributed in jar body 101 upper portion, lateral conduit 401's air outlet is also even like this to make furthest increase the multiple spot mixture of air and marsh gas, be equipped with air outlet on lateral conduit 401.

The device and the method for removing the hydrogen sulfide in the biogas by air stripping can efficiently remove the hydrogen sulfide in the biogas in the anaerobic reaction tank of the CSTR in the biogas engineering, and mainly comprise four parts, namely a CSTR anaerobic reaction tank, an air pump 2, a metering device 3 and an air stripping pipeline 4, wherein the biogas generated by the anaerobic reaction tank through fermentation is temporarily stored in a top space, the air pump 2 is used for conveying outdoor air to the top of the reaction tank 1 through pressure, the air stripping pipeline 4 is uniformly distributed on the top of the reaction tank 1 so as to maximize the multipoint mixing of the air and the biogas, the metering device 3 monitors the air temperature pressure and the flow in real time when the air pump 2 operates, and finally the air input proportion is controlled to be optimal so as to maximize the removal rate of the hydrogen sulfide.

The air stripping pipeline 4 is fixed with a steel component on the inner wall of the reaction tank 1, the air stripping pipeline 4 can be made of stainless steel or PE materials, an external pipeline of the air stripping pipeline 4 is directly connected with the air pump 2, and a temperature, pressure and flow real-time metering instrument (metering device 3) is arranged at the outlet of the air pump 2.

The main principle is that hydrogen sulfide is absorbed by aerobic desulfurization bacteria and finally converted into elemental sulfur to fall on the surface of a material in a reaction tank 1. The main purpose of the air introduction is to provide an oxygen source for the aerobic desulfurization bacteria, and then the biological flora can absorb hydrogen sulfide and convert the hydrogen sulfide into elemental sulfur. The air contains desulfurization bacteria which feed on oxygen in the air and hydrogen sulfide in the methane and propagate to generate a large amount of desulfurization bacteria, so that the hydrogen sulfide is adsorbed and removed more quickly. The air introduced initially is small, so that the excessive methane is prevented from being mixed with air, and the metering device 3 is adopted to monitor the air flow. The air stripping pipes 4 need to be evenly distributed to allow the desulfurization bacterial communities to contact with the biogas to the maximum extent, and especially the bacterial communities are most active near the stripping pipes.

The air injection flow of the biogas production flow meter is used for proportioning and mixing, and if too much air is injected, the oxygen content in the product gas is high, and the anaerobic fermentation process of the fermentation tank is even influenced; if the injected air is too little, the desulfurization flora can not play the maximum role, and the proportion is about 6 percent according to the operation experience. In practical operation, the judgment can be carried out according to the outlet gas composition of the fermentation tank, and when the hydrogen sulfide in the outlet pipeline is reduced to be below 100PPM, the injected air quantity is basically optimized.

As shown in fig. 4, a method for removing hydrogen sulfide in biogas by air stripping comprises the following steps:

step S1: after the reaction tank 1 normally produces the biogas, an air pump 2 and a corresponding switch valve are started, and air enters an air stripping pipeline 4;

step S2: proportionally adjusting the flow of air in the air pump 2 according to the flow of the gas in the reaction tank 1;

step S3: monitoring the gas composition at the outlet of the branch pipeline 401 in the reaction tank 1 after normal operation; especially hydrogen sulfide content, the air flow is monitored by adopting a metering device 3, and when the hydrogen sulfide content is higher and the oxygen concentration is lower, the flow of the air in the air pump 2 is increased until the ideal hydrogen sulfide concentration is reached; the process of oxygen absorption of the desulfurization bacteria and reproduction and adsorption of hydrogen sulfide absorption are accompanied in the process, and the adsorption is faster;

step S4: and (5) monitoring and maintaining regularly.

The system can also realize that one pump corresponds to a plurality of fermentation tanks (reaction tanks 1) and is switched by electromagnetic valves.

The utility model discloses the biggest advantage is the energy saving, reduces the desulfurization cost, owing to utilize be air and desulfurization fungus crowd, so do not have the consumptive material cost basically, only the power consumption of air pump, and the air supply volume is total marsh gas output 6%'s proportion, has decided to adopt less power air pump again, can realize the flow requirement, and the energy consumption is very low.

By the device, a novel desulfurization device and a novel desulfurization method are provided; the device has simple structure, reduces the cost and the technical operation difficulty; removing hydrogen sulfide by adopting a tank desulfurization mode; the blowing-off medium in the tank adopts air; the proportion of air for stripping is 4-8% of the proportion of methane produced by the fermentation tank; the air pipelines are uniformly distributed in the tank.

Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A device for removing hydrogen sulfide in biogas by air stripping is characterized by comprising:

the reaction tank (1) is internally provided with an air stripping device;

the air stripping device comprises:

and the air stripping pipeline (4) is arranged on the inner side of the upper part of the tank body (101) of the reaction tank (1).

2. The apparatus for removing hydrogen sulfide from biogas by air stripping as claimed in claim 1, wherein the reaction tank (1) is a CSTR anaerobic reaction tank.

3. An air stripping apparatus for removing hydrogen sulfide from biogas as claimed in claim 1, wherein the air stripping pipe (4) inside the upper part of the tank (101) is divided into a plurality of branch pipes (401).

4. The device for removing hydrogen sulfide in biogas by air stripping as claimed in claim 1, wherein a main pipeline (402) of the air stripping pipeline (4) arranged outside the reaction tank (1) is respectively provided with a metering device (3), an air pump (2) and a switch valve; the metering device (3) is used for measuring air pressure, flow and temperature; an air pump (2) is used to pump air and control the air flow.

5. An air stripping apparatus for removing hydrogen sulfide from biogas according to claim 1, wherein the reaction tank (1) comprises a tank top (102), and the tank top (102) is installed on the upper part of the tank body (101).

6. The device for removing the hydrogen sulfide in the biogas by air stripping as claimed in claim 4, characterized in that the air pump (2) is provided with a stand (5) at the lower part.

7. The device for removing hydrogen sulfide in biogas by air stripping as claimed in claim 3, wherein the branch pipes (401) are uniformly distributed inside the upper part of the tank body (101), and air outlets are arranged on the branch pipes (401).