CN210635950U - Biogas preparation device combining biogas purification and carbon dioxide methanation - Google Patents
Biogas preparation device combining biogas purification and carbon dioxide methanation Download PDFInfo
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- CN210635950U CN210635950U CN201920947475.XU CN201920947475U CN210635950U CN 210635950 U CN210635950 U CN 210635950U CN 201920947475 U CN201920947475 U CN 201920947475U CN 210635950 U CN210635950 U CN 210635950U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
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Abstract
The utility model provides a biogas preparation facilities of combined marsh gas purification and carbon dioxide methanation belongs to biogas technical field. The methane tank comprises a methane tank, a gas storage cabinet, a methane purification unit, a methane decarburization and purification unit, a gas mixer, an electrolytic water hydrogen production unit, a methanation unit, a heat exchanger, a gas-liquid separator, a water tank and a temperature controller. The utility model discloses when the biogas in the purification marsh gas, utilize the carbon dioxide hydrogenation methanation preparation biogas in the marsh gas, both avoided the carbon dioxide pollution that produces in the current marsh gas purification device, still improved the output of marsh gas preparation biogas simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the biogas, a biogas preparation facilities of combined marsh gas purification and carbon dioxide methanation is related to.
Background
China has abundant biogas resources, but the utilization mode is more traditional, and the biogas is mainly used by burning boilers and generating electricity except a few enterprises which obtain power generation and Internet surfing subsidies. In recent years, a plurality of high-yield biogas projects are provided, and the daily biogas yield reaches 10000-150000 Nm3And the gas quantity is far greater than the gas quantity required by enterprises, and the redundant biogas is often introduced into a boiler and is not completely combusted or even directly discharged, so that the environmental pollution and the resource waste are caused. Under the current severe trend of energy conservation and emission reduction, the biogas refining by using the biogas is a necessary development trend. The main component of the marsh gas is CH-removed4And CO2In addition, CO and H2S、NH3、O2And the like. The biogas is prepared according to the national standard (GB17820-1999) gas standard II: the high-order heating value is more than or equal to 31.4MJ/m3Carbon dioxide is less than or equal to 3 percent, and hydrogen sulfide is less than or equal to 20mg/m3. How to produce biogas with high methane content is an important research area today.
Such as Chinese patent [ CN201420368954]Discloses a device for preparing liquefied natural gas from biological natural gas obtained by biogas purification. The device separates other component gases in the biological natural gas while preparing the biological natural gas into liquefied natural gas. However, the CO accounts for 30 to 40 percent of the gas fraction of the biogas2Cannot be utilized.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above problem, provide a biogas preparation facilities of combined marsh gas purification and carbon dioxide methanation.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
a biogas preparation device combining biogas purification and carbon dioxide methanation comprises a biogas digester, a gas storage cabinet, a biogas purification unit, a biogas decarburization purification unit, a gas mixer, an electrolyzed water hydrogen production unit, a methanation unit, a heat exchanger, a gas-liquid separator, a water tank and a temperature controller, wherein the biogas digester, the gas storage cabinet, the biogas purification unit and the biogas decarburization purification unit are sequentially connected through a pipeline, the biogas decarburization purification unit is provided with a carbon dioxide outlet and a biogas outlet, the carbon dioxide outlet of the biogas decarburization purification unit is connected with the gas inlet of the gas mixer, the hydrogen outlet of the electrolyzed water hydrogen production unit is connected with the gas inlet of the gas mixer, the gas outlet of the gas mixer is connected with the gas inlet of the methanation unit, the gas outlet of the methanation unit is connected with the heat exchanger, the outlet of the heat exchanger is connected with the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected with the inlet of the water tank, and the outlet of the water tank is respectively connected with the methane tank and the temperature controller through a heat exchanger by pipelines.
In the biogas preparation device combining biogas purification and methanation of carbon dioxide, the biogas purification unit comprises a fan, a filter, a drying tower and a desulfurizing tower which are connected in sequence through pipelines.
In the biogas preparation device combining biogas purification and methanation of carbon dioxide, the biogas purification unit further comprises a deamination tower and a booster fan which are sequentially connected through pipelines.
In the biogas preparation device combining biogas purification and carbon dioxide methanation, the biogas decarburization purification unit comprises a purification section and a purification section, a gas outlet of the biogas purification unit is connected with the purification section, a carbon dioxide gas outlet of the purification section is connected with a gas inlet of a gas mixer, a mixed gas outlet of the purification section is connected with the purification section, the purification section is provided with a carbon dioxide outlet and a biogas outlet, and the carbon dioxide outlet of the purification section is connected with the gas inlet of the gas mixer.
In the biogas preparation device combining biogas purification and carbon dioxide methanation, the water electrolysis hydrogen production unit comprises water electrolysis hydrogen production equipment and a hydrogen purification device, the temperature controller, the water electrolysis hydrogen production equipment and the hydrogen purification device are sequentially connected, and a gas outlet of the hydrogen purification device is connected with a gas inlet of the gas mixer.
In the biogas preparation device combining biogas purification and carbon dioxide methanation, the water electrolysis hydrogen production equipment further comprises a hydrogen collecting device, an oxygen collecting device and a waste gas collecting device, the water electrolysis hydrogen production equipment is respectively connected with the hydrogen collecting device, the oxygen collecting device and the waste gas collecting device, and the hydrogen collecting device is connected with an inlet of the hydrogen purifying device.
In the biogas preparation device combining biogas purification and carbon dioxide methanation, the methanation unit is formed by connecting a plurality of methanation reactors and separators in series, and outlets of the separators are connected with the heat exchanger.
The biogas preparation device combining biogas purification and carbon dioxide methanation further comprises a compression and condensation unit, and a gas inlet of the compression and condensation unit is connected with a gas outlet of the gas-liquid separator.
In the biogas preparation device combining biogas purification and methanation of carbon dioxide, the gas inlet of the compression and condensation unit is respectively connected with the gas outlet of the gas-liquid separator and the biogas outlet of the biogas decarburization and purification unit.
In the biogas preparation device combining biogas purification and carbon dioxide methanation, the compression and condensation unit is a natural gas compressor or a liquefied gas compressor.
Compared with the prior art, the utility model has the advantages of:
1. the utility model discloses when the biogas in the purification marsh gas, utilize the carbon dioxide hydrogenation methanation preparation biogas in the marsh gas, both avoided the carbon dioxide pollution that produces in the current marsh gas purification device, still improved the output of marsh gas preparation biogas simultaneously.
2. The utility model utilizes the heat exchange network to recover the heat and water generated by the carbon dioxide hydromethanation, one part is used for the production of the methane tank, and the other part is used for the hydrogen production by water electrolysis, thereby having high energy utilization rate and little pollution.
3. The utility model discloses rational in infrastructure device is simple, has the possibility of extensive application.
Drawings
Fig. 1 is a device diagram of one embodiment of the present invention.
Fig. 2 is a device diagram of a second embodiment of the present invention.
Fig. 3 is a device diagram of a third embodiment of the present invention.
In the figure, a methane tank 1, a gas storage tank 2, a methane purification unit 3, a fan 301, a filter 302, a drying tower 303, a desulfurization tower 304, a deamination tower 305, a booster fan 306, a methane decarburization purification unit 4, a purification section 401, a purification section 402, a gas mixer 5, an electrolyzed water hydrogen production unit 6, an electrolyzed water hydrogen production facility 601, a hydrogen collection device 601a, an oxygen collection device 601b, an exhaust gas collection device 601c, a hydrogen purification device 602, a methanation unit 7, a methanation reactor 701, a separator 702, a heat exchanger 8, a gas-liquid separator 9, a water tank 10, a temperature controller 11, a compression condensation unit 12, a biogas, a' carbon dioxide, b crude natural gas, c biogas, d water, e liquefied natural gas or compressed natural gas.
Detailed Description
As shown in the figures 1-3, the biogas preparation device combining biogas purification and carbon dioxide methanation comprises a biogas digester 1, a gas storage cabinet 2, a biogas purification unit 3, a biogas decarburization purification unit 4, a gas mixer 5, an electrolyzed water hydrogen production unit 6, a methanation unit 7, a heat exchanger 8, a gas-liquid separator 9, a water tank 10 and a temperature controller 11, wherein the biogas digester 1, the gas storage cabinet 2, the biogas purification unit 3 and the biogas decarburization purification unit 4 are sequentially connected through pipelines, the biogas decarburization purification unit 4 is provided with a carbon dioxide outlet and a biogas outlet, the carbon dioxide outlet of the biogas decarburization purification unit 4 is connected with a gas inlet of the gas mixer 5, the hydrogen outlet of the electrolyzed water hydrogen production unit 6 is connected with a gas inlet of the gas mixer 5, the gas outlet of the gas mixer 5 is connected with a gas inlet of the methanation unit 7, and the gas outlet of the methanation unit 7 is connected with the heat exchanger 8, the outlet of the heat exchanger 8 is connected with the gas-liquid separator 9, the liquid outlet of the gas-liquid separator 9 is connected with the inlet of the water tank 10, and the outlet of the water tank 10 is respectively connected with the methane tank 1 and the temperature controller 11 through the heat exchanger 8.
In this embodiment, the biogas purification unit 3 includes a blower 301, a filter 302, a drying tower 303 and a desulfurizing tower 304 connected in sequence via pipes. It should be understood by those skilled in the art that since the compositions of the biogas generated by different anaerobic digestion raw materials and different anaerobic digestion processes are different, the biogas purification unit 3 further comprises a deamination tower 305 connected in sequence through a pipeline according to the actual production requirements, and the biogas purification unit 3 further needs a booster fan 306 according to the process requirements of biogas decarburization purification.
The biogas decarburization and purification unit 4 comprises a purification section 401 and a purification section 402, a gas outlet of the biogas purification unit 3 is connected with the purification section 401, a carbon dioxide gas outlet of the purification section 401 is connected with a gas inlet of the gas mixer 5, a mixed gas outlet of the purification section 401 is connected with the purification section 402, the purification section 402 is provided with a carbon dioxide outlet and a biogas outlet, and the carbon dioxide outlet of the purification section 402 is connected with the gas inlet of the gas mixer 5. The methane decarbonization and purification unit 4 utilizes two-stage pressure swing adsorption, namely PSA technology. The purification section 401 can adopt a 20-6-11-V flow path, namely a 20-tower 6-tower simultaneous absorption 11 times of pressure equalizing vacuum pumping flow paths. The purification section 402 can adopt a 15-7-6-V flow path, namely a 15-tower 7-tower simultaneous absorption 6 times of pressure equalizing and vacuum pumping flow paths.
The gas storage cabinet 2, the biogas purification unit 3, the fan 301, the filter 302, the drying tower 303, the desulfurizing tower 304, the deamination tower 305, the booster fan 306, the biogas decarburization purification unit 4, the purification section 401, the purification section 402, the gas mixer 5, the heat exchanger 8, the gas-liquid separator 9, the water tank 10 and the temperature controller 11 can all adopt commercially available products. Wherein, the filter 302 can be selected from a biogas filter or a biogas ultrafilter. The biogas decarburization purification unit 4 can be realized by Chinese patent No. CN 201210022967.0. The gas mixer 5 may employ a tubular static mixer. The heat exchanger 8 can be a heat exchange device such as that of Chinese patent No. CN 101023300A. The water tank 10 may be a stainless steel filter water tank. The gas-liquid separation reactor 9 can adopt a cyclone type or a precise core type gas-water separator.
The water electrolysis hydrogen production unit 6 comprises water electrolysis hydrogen production equipment 601 and a hydrogen purification device 602, the temperature controller 11, the water electrolysis hydrogen production equipment 601 and the hydrogen purification device 602 are sequentially connected, and a gas outlet of the hydrogen purification device 602 is connected with a gas inlet of the gas mixer 5. It should be understood by those skilled in the art that the water electrolysis hydrogen production equipment 601 in the water electrolysis hydrogen production unit 6 generates hydrogen, oxygen and exhaust gas during the process of producing hydrogen by electrolyzing water, and the hydrogen, oxygen and exhaust gas can be collected and processed separately, so in this embodiment, the water electrolysis hydrogen production equipment 601 is connected to a hydrogen collecting device 601a, an oxygen collecting device 601b and an exhaust gas collecting device 601c, and the hydrogen collecting device 601a is connected to an inlet of the hydrogen purifying device 602.
The hydrogen production facility 601, the hydrogen collecting device 601a, the oxygen collecting device 601b, the exhaust gas collecting device 601c, and the hydrogen purifying device 602 may be commercially available products. Wherein, the water electrolysis hydrogen production equipment 601 is one of high-temperature water electrolysis hydrogen production equipment, alkaline water electrolysis hydrogen production equipment or polymer film water electrolysis hydrogen production equipment. The hydrogen collecting device 601a, the oxygen collecting device 601b, and the off-gas collecting device 601c may be stainless steel tanks or cylinders. The hydrogen purification device 602 is a high-purity hydrogen preparation device, and the preferred scheme is that hydrogen is firstly subjected to pre-purification treatment through a hydrogen purifier to improve the hydrogen purity from 99.8% to 99.99%, and then 99.99% hydrogen is purified to 99.9999% by utilizing palladium tube hydrogen purification equipment.
In this embodiment, the methanation unit 7 is formed by connecting a plurality of methanation reactors 701 and separators 702 in series, and outlets of the separators 702 are connected with the heat exchanger 8. The methanation reactor 701 is a fixed bed methanation reactor, and the separator 702 is a commercially available gas-liquid separator.
In actual production, the biogas is often subjected to compression, compression and condensation treatment, so the embodiment further comprises a compression and condensation unit 1, and a gas inlet of the compression and condensation unit 12 is connected with a gas outlet of the gas-liquid separator 9. In order to improve the yield of the biogas prepared by the biogas in the embodiment, the gas inlet of the compression condensing unit 12 and the gas outlet of the gas-liquid separator 9 are respectively connected with the biogas outlet of the biogas decarburization purifying unit 4. The compression condensing unit 12 is selected from a natural gas compressor or a liquefied gas compressor.
The working principle of the embodiment is as follows: A. biogas produced by the biogas digester 1 is pumped into a gas storage cabinet 2 for storage, crude biogas in the gas storage cabinet 2 enters a biogas purification unit 3 for purification treatment to obtain mixed gas consisting of carbon dioxide and biogas,
B. b, the mixed gas obtained in the step A enters a biogas decarburization purification unit 4 for decarburization treatment to respectively obtain carbon dioxide a' and biological natural gas a; carbon dioxide a' enters the gas mixer 5 through the gas inlet of the gas mixer 5,
C. hydrogen produced by the water electrolysis hydrogen production unit 6 enters the gas mixer 5 through a gas inlet of the gas mixer 5, is fully mixed with the carbon dioxide a' obtained in the step B in the gas mixer 5 and is heated,
D. the mixed gas obtained in the step C enters a methanation unit 7 for methanation reaction, water obtained by the methanation unit 7 and the crude natural gas b enter a heat exchanger 8,
E. in the step D, the water obtained by the methanation unit 7 and the heat carried by the crude natural gas b are converted into water in a pipeline of a water tank 10 in a heat exchanger 8 through the heat exchanger 8 to generate superheated steam, the superheated steam respectively enters the methane tank 1 and the temperature controller 11 through pipelines,
F. and (3) the water and the crude natural gas b after heat exchange enter a gas-liquid separator 9, after separation treatment, the separated water enters a water tank 10 through a pipeline, and the separated gas is the biogas c.
G. And F, respectively feeding the biogas c obtained in the step F and the biogas a obtained in the step B into a compression and condensation unit 12 through pipelines for compression and condensation treatment, and finally obtaining the compressed natural gas or the liquefied natural gas.
Wherein, the temperature of the methane tank 1 in the step A is 25-65 ℃; and C, the gas volume ratio of the carbon dioxide and the hydrogen entering the gas mixer 5 in the step C is 1: 3.5-4.5, the temperature of the mixed gas obtained after the mixed gas enters the gas mixer 5 is 250-.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the terms of the methane tank 1, the gas storage tank 2, the methane purification unit 3, the fan 301, the filter 302, the drying tower 303, the desulfurizing tower 304, the deamination tower 305, the booster fan 306, the methane decarburization purification unit 4, the purification section 401, the purification section 402, the gas mixer 5, the electrolyzed water hydrogen production unit 6, the electrolyzed water hydrogen production equipment 601, the hydrogen collection device 601a, the oxygen collection device 601b, the waste gas collection device 601c, the hydrogen purification device 602, the methanation unit 7, the methanation reactor 701, the separator 702, the heat exchanger 8, the gas-liquid separator 9, the water tank 10, the temperature controller 11, the compression condensation unit 12, and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and should not be interpreted as imposing any additional limitations that are contrary to the spirit of the present invention.
Claims (10)
1. The biogas preparation device combining biogas purification and carbon dioxide methanation comprises a biogas digester (1), a gas storage cabinet (2) and is characterized by further comprising a biogas purification unit (3), a biogas decarburization purification unit (4), a gas mixer (5), an electrolyzed water hydrogen production unit (6), a methanation unit (7), a heat exchanger (8), a gas-liquid separator (9), a water tank (10) and a temperature controller (11), wherein the biogas digester (1), the gas storage cabinet (2), the biogas purification unit (3) and the biogas decarburization purification unit (4) are sequentially connected through pipelines, the biogas decarburization purification unit (4) is provided with a carbon dioxide outlet and a biogas outlet, the carbon dioxide outlet of the biogas decarburization purification unit (4) is connected with a gas inlet of the gas mixer (5), a hydrogen outlet of the electrolyzed water hydrogen production unit (6) is connected with a gas inlet of the gas mixer (5), the gas outlet of the gas mixer (5) is connected with the gas inlet of the methanation unit (7), the gas outlet of the methanation unit (7) is connected with the heat exchanger (8), the outlet of the heat exchanger (8) is connected with the gas-liquid separator (9), the liquid outlet of the gas-liquid separator (9) is connected with the inlet of the water tank (10), and the outlet of the water tank (10) is connected with the methane tank (1) and the temperature controller (11) through the heat exchanger (8) by a pipeline.
2. The biogas production plant integrating biogas purification and methanation of carbon dioxide according to claim 1, characterized in that the biogas purification unit (3) comprises a fan (301), a filter (302), a drying tower (303) and a desulfurization tower (304) connected in sequence by pipes.
3. The biogas production plant integrating biogas purification and methanation of carbon dioxide according to claim 2, characterized in that the biogas purification unit (3) further comprises a deamination tower (305) and a booster fan (306) connected in series by pipes.
4. The biogas preparation plant combining biogas purification and methanation of carbon dioxide according to claim 1, characterized in that the biogas decarbonization and purification unit (4) comprises a purification section (401) and a purification section (402), the gas outlet of the biogas purification unit (3) is connected to the purification section (401), the carbon dioxide gas outlet of the purification section (401) is connected to the gas inlet of the gas mixer (5), the mixed gas outlet of the purification section (401) is connected to the purification section (402), the purification section (402) is provided with a carbon dioxide outlet and a biogas outlet, and the carbon dioxide outlet of the purification section (402) is connected to the gas inlet of the gas mixer (5).
5. The biogas preparation device combining biogas purification and carbon dioxide methanation according to claim 1, characterized in that the electrolyzed water hydrogen production unit (6) comprises electrolyzed water hydrogen production equipment (601) and a hydrogen purification device (602), the temperature controller (11), the electrolyzed water hydrogen production equipment (601) and the hydrogen purification device (602) are connected in sequence, and a gas outlet of the hydrogen purification device (602) is connected with a gas inlet of the gas mixer (5).
6. The biogas preparation device combining biogas purification and carbon dioxide methanation according to claim 5, characterized in that the water electrolysis hydrogen production equipment (601) further comprises a hydrogen collecting device (601a), an oxygen collecting device (601b) and an exhaust gas collecting device (601c), the water electrolysis hydrogen production equipment (601) is respectively connected with the hydrogen collecting device (601a), the oxygen collecting device (601b) and the exhaust gas collecting device (601c), and the hydrogen collecting device (601a) is connected with an inlet of the hydrogen purification device (602).
7. The biogas production plant integrating biogas purification and carbon dioxide methanation according to claim 1, characterized in that the methanation unit (7) is composed of several methanation reactors (701) and separators (702) connected in series, and the outlets of the separators (702) are connected with the heat exchanger (8).
8. The biogas production plant integrating biogas purification and methanation of carbon dioxide according to claim 1, characterized in that it further comprises a compression and condensation unit (12), wherein the gas inlet of the compression and condensation unit (12) is connected with the gas outlet of the gas-liquid separator (9).
9. The biogas production plant with combined biogas purification and methanation of carbon dioxide according to claim 8, characterized in that the gas inlet of the compression and condensation unit (12) is connected to the biogas outlet of the biogas decarbonization and purification unit (4) via the gas inlet of the gas-liquid separator (9).
10. The biogas production plant integrating biogas purification and methanation of carbon dioxide according to claim 8 or 9, characterized in that the compression and condensation unit (12) is a natural gas compressor or a liquefied gas compressor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295071A (en) * | 2019-06-21 | 2019-10-01 | 浙江臻泰能源科技有限公司 | The bio-natural gas preparation facilities and method of joint Methane decarbonization purification technique and hydrogenation of carbon dioxide methanation |
| WO2021248898A1 (en) * | 2020-06-08 | 2021-12-16 | 阳光电源股份有限公司 | Renewable energy-based hydrogen production and storage system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295071A (en) * | 2019-06-21 | 2019-10-01 | 浙江臻泰能源科技有限公司 | The bio-natural gas preparation facilities and method of joint Methane decarbonization purification technique and hydrogenation of carbon dioxide methanation |
| WO2021248898A1 (en) * | 2020-06-08 | 2021-12-16 | 阳光电源股份有限公司 | Renewable energy-based hydrogen production and storage system and control method thereof |
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