CN215828701U - Structure for removing carbon dioxide in biogas - Google Patents
Structure for removing carbon dioxide in biogas Download PDFInfo
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- CN215828701U CN215828701U CN202122135349.4U CN202122135349U CN215828701U CN 215828701 U CN215828701 U CN 215828701U CN 202122135349 U CN202122135349 U CN 202122135349U CN 215828701 U CN215828701 U CN 215828701U
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Abstract
The utility model provides a structure for removing carbon dioxide in biogas, comprising: the methane absorption device comprises a first membrane contactor, a second membrane contactor, a third membrane contactor, a fourth membrane contactor and a fourth membrane contactor, wherein one end of the first membrane contactor is connected with a methane inlet, a first hollow fiber membrane is arranged in the methane contactor, the methane inlet is communicated with one outer side of the first hollow fiber membrane, the other outer side of the first hollow fiber membrane is communicated with an absorption liquid storage tank through an absorption liquid transmission pipeline, and the first membrane contactor selectively penetrates carbon dioxide gas in methane through gas pressure difference between the two outer sides of the first hollow fiber membrane so as to dissolve the carbon dioxide gas in absorption liquid; therefore, the carbon dioxide gas in the biogas can be effectively removed, the biogas digester can be operated under the conditions of normal temperature and normal pressure, the operation cost is low, the biogas digester is safe and simple, and the floor area of equipment is small.
Description
Technical Field
The utility model relates to the technical field of gas treatment, in particular to a structure for removing carbon dioxide in biogas.
Background
Organic wastes such as livestock manure and restaurant waste water can be subjected to anaerobic digestion in a digester to produce biogas consisting of about 65% methane, 35% carbon dioxide and a small amount of impurities such as hydrogen sulfide.
The biogas as described above is mainly used as power generation or low-grade fuel at present, but has problems of low power production efficiency and difficulty in heat regulation because the general biogas contains a high content of carbon dioxide as described above, and thus has many limitations in use as alternative fuel. The marsh gas is used as power generation or low-grade fuel, and the carbon dioxide content CO is required after the marsh gas is decarbonized2Less than or equal to 3%. The existing process uses organic amine solution to absorb carbon dioxide in the biogas, but the operation cost of organic amine absorption is high, tower equipment is needed, high-temperature and high-pressure operation is needed, the danger degree is high, the investment cost is high, and the occupied area is large; therefore, the emergence of a structure for removing carbon dioxide from biogas is urgently awaited.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a structure for removing carbon dioxide in biogas, which can effectively remove carbon dioxide in biogas, can operate under normal temperature and normal pressure, and has the advantages of low operation cost, safety, simplicity and small equipment floor area.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a structure for removing carbon dioxide from biogas, comprising: the methane absorption device comprises a first membrane contactor, wherein one end of the first membrane contactor is connected with a methane inlet, a first hollow fiber membrane is arranged in the first membrane contactor, the methane inlet is communicated with one outer side of the first hollow fiber membrane, the other outer side of the first hollow fiber membrane is communicated with an absorption liquid storage tank through an absorption liquid transmission pipeline, and the first membrane contactor selectively permeates carbon dioxide gas in methane through gas pressure difference between the two outer sides of the first hollow fiber membrane so as to dissolve the carbon dioxide gas in the absorption liquid.
The utility model provides a structure for removing carbon dioxide in biogas, which can effectively remove carbon dioxide in biogas, can operate under normal temperature and normal pressure, and has the advantages of low operation cost, safety, simplicity and small equipment floor area.
As a preferred technical scheme, the other end of the first membrane contactor is connected with a biogas outlet, and biogas from which carbon dioxide gas is removed is discharged through the biogas outlet.
Preferably, the first membrane contactor is further provided with an absorbing liquid outlet rich in carbon dioxide, and the absorbing liquid outlet rich in carbon dioxide is communicated with the analysis liquid storage tank through a transmission pipeline of the absorbing liquid rich in carbon dioxide.
The preferable technical scheme comprises the following steps: the second membrane contactor is provided with an analytic liquid inlet, the analytic liquid inlet is communicated with the analytic liquid storage tank through an analytic liquid conveying pipeline, and the analytic liquid conveying pipeline is provided with a second booster pump.
As a preferred embodiment, the second membrane contactor includes: the second hollow fiber membrane and the second membrane contactor outer tube, the inner chamber and the analysis liquid inlet of second hollow fiber membrane communicate, second membrane contactor outer tube cover is located the second hollow fiber membrane outside, the second hollow fiber membrane with form analysis liquid between the second membrane contactor outer tube and flow the chamber.
As a preferred technical scheme, the analytic solution inlet is communicated with the analytic solution flowing cavity, the second membrane contactor is provided with a purging gas inlet, the purging gas inlet is communicated with the second hollow fiber membrane inner cavity, the inner cavity of the second hollow fiber membrane is provided with a plurality of second selective breathable micropores, and the second selective breathable micropores are used for selectively permeating carbon dioxide gas in the analytic solution.
According to a preferable technical scheme, one end of the second membrane contactor is provided with a carbon dioxide gas outlet, the carbon dioxide gas outlet is communicated with an inner cavity of the second hollow fiber membrane through a carbon dioxide gas transmission pipeline, and the carbon dioxide gas transmission pipeline is connected with a vacuum pump.
Preferably, the other end of the second membrane contactor is provided with an absorption liquid recovery outlet, and the absorption liquid outlet is communicated with an absorption liquid storage tank through an absorption liquid recovery conveying pipeline.
The utility model also provides a process for removing carbon dioxide in biogas, which comprises the following steps: biogas enters one outer side of the first hollow fiber membrane from a biogas inlet, an absorption solution in the absorption solution storage tank is transmitted into the other outer side of the first hollow fiber membrane through the first booster pump, the first membrane contactor can selectively permeate carbon dioxide gas in the biogas through the gas pressure difference between the two outer sides of the first hollow fiber membrane, and the absorption solution is subjected to mass transfer absorption on the carbon dioxide gas in the biogas through the first membrane contactor to obtain the absorption solution rich in carbon dioxide.
As a preferred technical scheme, the method also comprises the following steps: the absorption liquid rich in carbon dioxide sequentially passes through an absorption liquid outlet rich in carbon dioxide and a transmission pipeline rich in carbon dioxide absorption liquid to be transmitted into a desorption liquid storage tank for desorption to obtain desorption liquid, the desorption liquid in the desorption liquid storage tank is transmitted into a desorption liquid flowing cavity through a desorption liquid transmission pipeline, the purging gas enters the inner cavity of the second hollow fiber membrane through the purging gas inlet and purges the inner cavity so as to accelerate the carbon dioxide gas in the desorption liquid to selectively permeate a plurality of second selective gas-permeable micropores on the second hollow fiber membrane to enter the inner cavity of the second hollow fiber membrane, and the carbon dioxide gas in the inner cavity of the second hollow fiber membrane is sucked out by a vacuum pump and is discharged by a carbon dioxide gas discharge pipeline, and the absorption liquid from which the carbon dioxide gas is removed passes through an absorption liquid recovery discharge port and is recovered and conveyed into an absorption liquid storage tank by an absorption liquid recovery conveying pipeline.
Drawings
Fig. 1 is a structural diagram of a structure for removing carbon dioxide from biogas according to the present invention.
Wherein: 1-biogas inlet; 2-a methane outlet; 3-a first membrane contactor; 4-absorption liquid conveying pipeline; 5-an absorption liquid storage tank; 6-a first booster pump; 7-an outlet for the absorption liquid rich in carbon dioxide; 8-a transmission pipeline rich in carbon dioxide absorption liquid; 9-analytic solution storage tank; 10-a second membrane contactor; 101-a second membrane contactor outer tube; 11-an inlet for a resolving liquid; 12-a desorption liquid conveying pipeline; 13-a second booster pump; 14-a purge gas inlet; 15-carbon dioxide gas vent; 16-a vacuum pump; 17-a carbon dioxide gas discharge line; 18-absorption liquid recovery discharge port; 19-absorption liquid recovery conveying pipeline.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It is understood that the utility model achieves the objects of the utility model by means of some embodiments.
As shown in fig. 1, the present invention provides a structure for removing carbon dioxide from biogas, comprising: the methane absorption device comprises a first membrane contactor 3, wherein one end of the first membrane contactor 3 is connected with a methane inlet 1, a first hollow fiber membrane is arranged in the first membrane contactor 3, the methane inlet 1 is communicated with one outer side of the first hollow fiber membrane, the other outer side of the first hollow fiber membrane is communicated with an absorption liquid storage tank 5 through an absorption liquid transmission pipeline 4, and the first membrane contactor 3 selectively permeates carbon dioxide gas in methane through gas pressure difference between the two outer sides of the first hollow fiber membrane so as to dissolve the carbon dioxide gas in the absorption liquid; the other end of the first membrane contactor 3 is connected with a methane outlet 2, methane with carbon dioxide removed is discharged through the methane outlet 2, and a first booster pump 6 is connected to the absorption liquid transmission pipeline 4.
The first hollow fiber membrane in the first membrane contactor 3 is a gas transport membrane having selectivity in that only gas is permeable and liquid is impermeable, and therefore, gas-liquid contact can be made on both sides of the first hollow fiber membrane; the first hollow fiber membrane has no selectivity to gas types, the selectivity to the gas types lies in a gas pressure difference generation process on two sides of the membrane, different from other membranes, the gas transmission membrane is not a filtering process, but a mass transfer process, and a mass transfer equation M & ltKA & gt (delta P) is followed.
As shown in fig. 1, the first membrane contactor 3 is further provided with an absorbing liquid outlet 7 rich in carbon dioxide, and the absorbing liquid outlet 7 rich in carbon dioxide is communicated with a desorption liquid storage tank 9 through a transmission pipeline 8 rich in carbon dioxide absorbing liquid; a resolving liquid inlet 11 is formed in the second membrane contactor 10, the resolving liquid inlet 11 is communicated with the resolving liquid storage tank 9 through a resolving liquid conveying pipeline 12, and a second booster pump 13 is arranged on the resolving liquid conveying pipeline 12; the second membrane contactor 10 includes: the second membrane contactor outer tube 101 is sleeved outside the second hollow fiber membrane, a desorption liquid flowing cavity is formed between the second hollow fiber membrane and the second membrane contactor outer tube 101, a purging gas inlet 14 is formed in the second membrane contactor 10, the purging gas inlet 14 is communicated with the inner cavity of the second hollow fiber membrane, a plurality of second selectable breathable micropores are formed in the inner cavity of the second hollow fiber membrane, and the second selectable breathable micropores are used for selectively permeating carbon dioxide in the desorption liquid and entering the inner cavity of the second hollow fiber membrane; a carbon dioxide gas outlet 15 is formed in one end of the second membrane contactor 10, the carbon dioxide gas outlet 15 is communicated with the inner cavity of the second hollow fiber membrane through a carbon dioxide gas outlet pipeline 17, and a vacuum pump 16 is connected to the carbon dioxide gas outlet pipeline 17; and the other end of the second membrane contactor 10 is provided with an absorption liquid recovery outlet 18, the absorption liquid recovery outlet 18 is communicated with the second membrane contactor 10, and the absorption liquid outlet 18 is communicated with the absorption liquid storage tank 5 through an absorption liquid recovery conveying pipeline 19.
The second hollow fiber membrane is a gas transport membrane having selectivity in that only gas can pass through and liquid cannot permeate, and can be used for adding or removing gas from liquid.
And when the analysis liquid flows outside the second hollow fiber membrane, the inner cavity of the second hollow fiber membrane is vacuumized by the vacuum pump 16 and is purged by applying purge gas, and under the negative pressure of vacuumization or purge gas purging of the vacuum pump 16, carbon dioxide gas dissolved in the analysis liquid continuously moves to the inner cavity of the second hollow fiber membrane through the second selective gas-permeable micropores and is taken away by the vacuumization or purge gas, so that the purpose of removing the dissolved gas in the analysis liquid is achieved.
The utility model also provides a process for removing carbon dioxide in biogas, wherein the biogas enters one outer side of the first hollow fiber membrane from a biogas inlet 1, an absorption solution in an absorption solution storage tank 5 is transmitted into the other outer side of the first hollow fiber membrane through a first booster pump 6, a first membrane contactor 3 can selectively permeate carbon dioxide gas in the biogas through gas pressure difference at two sides of the first hollow fiber membrane, and the absorption solution is subjected to mass transfer absorption of the carbon dioxide gas in the biogas through the first membrane contactor 3 to obtain an absorption solution rich in carbon dioxide;
absorbing liquid rich in carbon dioxide sequentially passes through an absorbing liquid outlet 7 rich in carbon dioxide and a transmission pipeline 8 rich in carbon dioxide absorbing liquid to be transmitted into an analyzing liquid storage tank 5 for analysis to obtain analyzing liquid, the analyzing liquid in the analyzing liquid storage tank 5 is transmitted into an analyzing liquid flowing cavity through the analyzing liquid transmission pipeline 8, purging gas enters the inner cavity of the second hollow fiber membrane through a purging gas inlet 14 and is purged to accelerate carbon dioxide gas in the analyzing liquid to selectively permeate a plurality of second selective breathable micropores in the second hollow fiber membrane to enter the inner cavity of the second hollow fiber membrane, the carbon dioxide gas in the inner cavity of the second hollow fiber membrane is sucked out through a vacuum pump 16 and is discharged through a carbon dioxide gas discharge pipeline 17, the absorbing liquid after the carbon dioxide gas is removed passes through an absorbing liquid recovery discharge port 18 and is recovered and transmitted into the absorbing liquid storage tank 5 through an absorbing liquid recovery transmission pipeline 19 for reutilization, effectively saving energy consumption.
The operating pressure of the first booster pump 6 and the second booster pump 13 is preferably 0.2Mpa, the temperature of the absorption liquid is preferably 15-25 ℃, and the absorption liquid is preferably an aqueous solution.
The utility model provides a structure and a process for removing carbon dioxide in biogas, which can effectively remove carbon dioxide gas in biogas, operate under normal temperature and normal pressure, and have the advantages of low operation cost, safety, simplicity and small occupied area of equipment.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all modifications and equivalents falling within the scope of the appended claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. A structure for removing carbon dioxide in biogas is characterized by comprising: the methane absorption device comprises a first membrane contactor, wherein one end of the first membrane contactor is connected with a methane inlet, a first hollow fiber membrane is arranged in the methane contactor, the methane inlet is communicated with one outer side of the first hollow fiber membrane, the other outer side of the first hollow fiber membrane is communicated with an absorption liquid storage tank through an absorption liquid transmission pipeline, and the first membrane contactor selectively penetrates through carbon dioxide gas in methane through gas pressure difference between the two outer sides of the first hollow fiber membrane so as to dissolve the carbon dioxide gas in the absorption liquid.
2. The structure for removing carbon dioxide from biogas according to claim 1, wherein a biogas outlet is connected to the other end of the first membrane contactor, and the biogas from which carbon dioxide gas is removed is discharged through the biogas outlet.
3. The structure for removing carbon dioxide from biogas according to claim 2, wherein the first membrane contactor is further provided with an absorbing liquid outlet rich in carbon dioxide, and the absorbing liquid outlet rich in carbon dioxide is communicated with the desorption liquid storage tank through a transmission pipeline of the absorbing liquid rich in carbon dioxide.
4. The structure for removing carbon dioxide from biogas according to claim 3, comprising: the second membrane contactor is provided with an analytic liquid inlet, the analytic liquid inlet is communicated with the analytic liquid storage tank through an analytic liquid conveying pipeline, and the analytic liquid conveying pipeline is provided with a second booster pump.
5. The structure for removing carbon dioxide from biogas according to claim 4, wherein the second membrane contactor comprises: the second hollow fiber membrane and the second membrane contactor outer tube, the inner chamber and the analysis liquid inlet of second hollow fiber membrane communicate, second membrane contactor outer tube cover is located the second hollow fiber membrane outside, the second hollow fiber membrane with form analysis liquid between the second membrane contactor outer tube and flow the chamber.
6. The structure for removing carbon dioxide from biogas according to claim 5, wherein the desorption solution inlet is communicated with the desorption solution flowing cavity, the second membrane contactor is provided with a purge gas inlet, the purge gas inlet is communicated with the inner cavity of the second hollow fiber membrane, the inner cavity of the second hollow fiber membrane is provided with a plurality of second selective gas-permeable micropores, and the second selective gas-permeable micropores are used for selectively permeating carbon dioxide gas in the desorption solution.
7. The structure for removing carbon dioxide from biogas according to claim 5, wherein a carbon dioxide gas outlet is provided at one end of the second membrane contactor, the carbon dioxide gas outlet is communicated with the inner cavity of the second hollow fiber membrane through a carbon dioxide gas transmission pipeline, and a vacuum pump is connected to the carbon dioxide gas transmission pipeline.
8. The structure for removing carbon dioxide from biogas according to claim 5, wherein the other end of the second membrane contactor is provided with an absorption liquid recovery outlet, and the absorption liquid outlet is communicated with the absorption liquid storage tank through an absorption liquid recovery conveying pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122135349.4U CN215828701U (en) | 2021-09-06 | 2021-09-06 | Structure for removing carbon dioxide in biogas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122135349.4U CN215828701U (en) | 2021-09-06 | 2021-09-06 | Structure for removing carbon dioxide in biogas |
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| Publication Number | Publication Date |
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| CN215828701U true CN215828701U (en) | 2022-02-15 |
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| CN202122135349.4U Active CN215828701U (en) | 2021-09-06 | 2021-09-06 | Structure for removing carbon dioxide in biogas |
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