CN210635949U - Electric energy storage system for jointly preparing biogas by utilizing surplus electric power and biogas - Google Patents
Electric energy storage system for jointly preparing biogas by utilizing surplus electric power and biogas Download PDFInfo
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- CN210635949U CN210635949U CN201920947445.9U CN201920947445U CN210635949U CN 210635949 U CN210635949 U CN 210635949U CN 201920947445 U CN201920947445 U CN 201920947445U CN 210635949 U CN210635949 U CN 210635949U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
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Abstract
The utility model provides an electric power energy storage system for jointly producing biogas by utilizing surplus electric power and biogas. It includes renewable energy power generation facility, renewable energy power generation facility connect the brineelectrolysis device, the brineelectrolysis device connect the hydrogen storage tank, the hydrogen storage tank connect the fuel cell device, the fuel cell device connect municipal power grid, still include marsh gas supply arrangement, marsh gas supply arrangement connect marsh gas purifier, marsh gas purifier connects methanation device, methanation device connects the biogas storage tank, fuel cell device and natural gas pipeline are connected respectively to the biogas storage tank, methanation device is still connected to the hydrogen storage tank. The utility model discloses surplus electric power is through electrolysis water hydrogen manufacturing, and marsh gas hydrogenation methanation preparation natural gas, and the hydrogen and the partly natural gas of preparing pass through fuel cell electricity generation, and another part natural gas of preparation can be used as other usage, realizes the peak clipping and fills in millet and the comprehensive utilization of marsh gas.
Description
Technical Field
The utility model belongs to the field of energy comprehensive utilization and recycling, and relates to an electric power energy storage system and method for jointly producing biogas by utilizing surplus electric power and methane.
Background
The peak-to-valley electricity prices are also called "time-of-use electricity prices". An electricity price system for calculating the electricity fee according to the peak electricity consumption and the valley electricity consumption. The peak power consumption generally refers to the power consumption when the power consumption unit is centralized and the power supply is in short supply, such as the power consumption in the daytime and in the valley with higher charging standard, and generally refers to the power consumption when the power consumption unit is less and the power supply is more sufficient, such as the power consumption in the night with lower charging standard. The peak-valley electricity price is beneficial to promoting the electricity consumption unit to stagger the electricity consumption time, and fully utilizing equipment and energy.
However, in the valley power utilization, a large amount of surplus power is not used, and energy storage cannot be formed.
The main component of biogas is methane. The marsh gas is composed of 50% -80% of methane CH 420% -40% of carbon dioxide CO20% -5% of nitrogen N2Less than 1% of hydrogen H2Less than 0.4% oxygen O2With 0.1% -3% of hydrogen sulfide H2S and the like. Because the methane contains a small amount of hydrogen sulfide, the methane has slight odor and has the characteristics similar to natural gas. The main component of methane is an ideal gas fuel, it is colorless and odorless, and can be combusted after being mixed with a proper amount of air, the heat productivity of per cubic meter of pure methane is 34000 kilojoules, and each cubic meterThe calorific value of the rice methane is about 20800-23600 kilojoules. Namely, 1 cubic meter of methane can generate heat equivalent to that provided by 0.7 kilogram of anthracite after being completely combusted. Compared with other fuel gases, the fuel gas has better anti-explosion performance and is a good clean fuel.
However, the combustion value of the methane is reduced because the methane contains 20-40% of carbon dioxide, and on the other hand, the methane is difficult to store and transport due to the existence of the carbon dioxide.
How to handle marsh gas, produce the natural gas of being convenient for transportation and use to carry out make full use of energy storage with the low ebb electricity, realize the peak clipping and fill in the valley, be the problem that needs to solve at present urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above problem, provide an utilize surplus electric power and marsh gas jointly to make biogas's electric power energy storage system.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides an utilize surplus electric power and marsh gas to jointly make biogas's electric power energy storage system, includes renewable energy power generation facility, renewable energy power generation facility connect the brineelectrolysis device, the brineelectrolysis device connect the hydrogen storage tank, the hydrogen storage tank connect the fuel cell device, the fuel cell device connect municipal power grid, still include marsh gas supply device, marsh gas supply device connect marsh gas purifier, marsh gas purifier connects methanation device, methanation device connects the biogas storage tank, fuel cell device and natural gas pipeline are connected respectively to the biogas storage tank, methanation device is still connected to the hydrogen storage tank.
In the above power energy storage system for producing biogas by combining surplus power and biogas, the biogas supply device comprises a biogas tank and a gas storage cabinet connected with the biogas tank, the gas storage cabinet is connected with a biogas purification device, and the biogas purification device is connected with a methanation device through a gas mixer.
In the above-mentioned electric power energy storage system for jointly making biogas with surplus electric power and marsh gas, the marsh gas purifier include the fan of connecting the gas holder, the filter is connected to the fan, the filter is connected to the desulfurizing tower, the desulfurizing tower is connected to the drying tower, the gas mixer is connected to the drying tower, the gas-liquid separator is connected through first heat exchanger to the methanation device, biogas storage tank and water tank are connected to the gas-liquid separator, the water tank passes through first heat exchanger and connects the methane-generating pit, the gas mixer is connected to the brineelectrolysis device.
In the electric energy storage system for preparing the biogas by combining the surplus electric power and the biogas, the first heat exchanger is connected with the biogas digester and the temperature controller through the flow divider, and the temperature controller is connected with the water electrolysis device.
In the above-mentioned electric power energy storage system for jointly preparing the biogas by using surplus electric power and biogas, the biogas purification device comprises a fan connected with the gas storage cabinet, the fan is connected with a filter, the filter is connected with a drying tower, the drying tower is connected with a desulfurizing tower, the desulfurizing tower is connected with a gas mixer, the gas mixer is connected with a methanation device, and the water electrolysis device is connected with the gas mixer.
In foretell jointly make biogas's electric power energy storage system with surplus electric power and marsh gas, methanation device include first methanator and second methanator, the gas mixer connect first methanator, first methanator passes through the second heat exchanger and connects the second methanator, the first heat exchanger is connected to the second methanator.
In the electric energy storage system for preparing the biogas by combining the surplus electric power and the biogas, the second heat exchanger is connected with the temperature controller, and the temperature controller is connected with the water electrolysis device.
In the above power storage system for producing biogas by combining surplus power and biogas, the renewable energy power generation device is a hydroelectric power station, a wind power station or a solar power station.
Compared with the prior art, the utility model has the advantages of:
1. the surplus electric power is used for producing hydrogen through water electrolysis, the methane is used for producing natural gas through hydromethanation, the produced hydrogen and a part of the natural gas are used for generating electricity through a fuel cell, and the other part of the produced natural gas can be used for other purposes, so that peak clipping and valley filling and comprehensive utilization of the methane are realized.
2. In the production process, carbon dioxide reacts with hydrogen to generate methane, so that the emission of carbon dioxide is reduced, and the environment-friendly requirement is better met.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic connection diagram of the methane supply device, the methanation device and the water electrolysis device of the utility model.
Fig. 3 is another connection schematic diagram of the methane supply device, the methanation device and the water electrolysis device of the utility model.
Fig. 4 is another connection schematic diagram of the methane supply device, the methanation device and the water electrolysis device of the utility model.
In the figure: renewable energy power generation device 1, water electrolysis device 2, hydrogen storage tank 3, fuel cell device 4, municipal power grid 5, biogas supply device 6, biogas purification device 7, methanation device 8, biogas storage tank 9, natural gas pipeline 10, biogas digester 11, gas holder 12, gas mixer 13, fan 14, filter 15, desulfurizing tower 16, drying tower 17, first heat exchanger 18, gas-liquid separator 19, water tank 20, flow divider 21, temperature controller 22, first methanator 23, second methanator 24, second heat exchanger 25.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, an electric energy storage system for jointly producing biogas by using surplus electric power and biogas comprises a renewable energy power generation device 1, wherein the renewable energy power generation device 1 is connected with an electrolytic water device 2, the electrolytic water device 2 is connected with a hydrogen storage tank 3, a water source 100 is connected with the electrolytic water device 2 to provide a water source for the electrolytic water device 100, the hydrogen storage tank 3 is connected with a fuel cell device 4, the fuel cell device 4 is connected with a municipal power grid 5, the electric energy storage system further comprises a biogas supply device 6, the biogas supply device 6 is connected with a biogas purification device 7, the biogas purification device 7 is connected with a methanation device 8, the methanation device 8 is connected with a biogas storage tank 9, the biogas storage tank 9 is respectively connected with the fuel cell device 4 and a natural gas pipeline 10, and the hydrogen storage tank 3 is further connected with the methanation device 8.
Preferably, the municipal power grid 5 is connected with the water electrolysis device 2.
At the valley point, surplus electric power of the municipal power grid 5 supplies power to the water electrolysis device 2, hydrogen generated by the water electrolysis device 2 is stored in the hydrogen storage tank 3, the methane supply device 6 is purified by the methane purification device 7 and then enters the methanation device 8, carbon dioxide and hydrogen perform methanation reaction in the methanation device 8 to generate biogas mainly containing methane, the biogas is stored in the biogas storage tank 9 and input into the natural gas pipeline 10.
At the peak point, the renewable energy power generation device 1 generates power, the power is transmitted to the water electrolysis device 2, the hydrogen generated by the water electrolysis device 2 is stored in the hydrogen storage tank 3, the hydrogen in the hydrogen storage tank 3 generates power through the fuel cell device 4, and the electric energy is input into the municipal power grid 5; the redundant hydrogen of the hydrogen storage tank 3 is input into the methanation device 8, the biogas supply device 6 is purified by the biogas purification device 7 and then enters the methanation device 8, in the methanation device 8, the carbon dioxide and the hydrogen are subjected to methanation reaction to generate biogas mainly containing methane, and the biogas is input into a natural gas pipeline. Of course, the biogas can also be input into the fuel cell device 4, the power is generated by the fuel cell device 4, and the electric energy is input into the municipal power grid 5, so as to realize peak clipping and valley filling.
It should be understood by those skilled in the art that the circuit structure in the present embodiment is not particularly limited as long as the circuit connection can be realized. In the present embodiment, the renewable energy power generation device 1 is a hydroelectric power plant, a wind power plant, or a solar power plant. The water electrolysis device 2 can adopt a commercial product, such as a high-temperature electrolysis device, an alkaline electrolysis cell or a polymer film electrolysis cell. The fuel cell device 4 may be a commercially available product such as a hydrogen fuel cell and a methane fuel cell, and may be a fuel cell system available from new power companies.
In this embodiment, referring to fig. 2, the biogas supply device 6 includes a biogas tank 11 and a gas storage 12 connected to the biogas tank 11, the gas storage 12 is connected to the biogas purification device 7, and the biogas purification device 7 is connected to the methanation device 8 through a gas mixer 13. The gas mixer 13 and the methanation device 8 are prior art and may be commercially available products such as the methanation device manufactured by Shanghai Huaxi chemical technology Limited.
In this embodiment, the biogas purification device 7 further includes a fan 14 connected to the gas storage 12, the fan 14 is connected to a filter 15, the filter 15 is connected to a desulfurizing tower 16, the desulfurizing tower 16 is connected to a drying tower 17, the drying tower 17 is connected to a gas mixer 13, the methanation device 8 is connected to a gas-liquid separator 19 through a first heat exchanger 18, the gas-liquid separator 19 is connected to a biogas storage tank 9 and a water tank 20, the water tank 20 is connected to a biogas digester 11 through the first heat exchanger 18, and the water electrolysis device 2 is connected to the gas mixer 13. The filter 15, the desulfurizing tower 16 and the drying tower 17 are all prior art, and the first heat exchanger 18 can be a plate heat exchanger or a tube heat exchanger. And (4) dehydrating and removing sulfides after the biogas is purified. The water in the water tank 20 is heated by the first heat exchanger 18 and then enters the methane tank 11 to heat the methane tank.
Specifically, the biogas in the biogas digester is pressurized to 1-20bar by a fan, enters a filter for filtration and dust removal, is desulfurized by a desulfurizing tower, and then enters a drying tower for dehydration to obtain CH4And CO2The first heat exchanger 18 is connected with the methane tank 11 and the temperature controller 22 through the flow divider 21, and the temperature controller 22 is connected with the water electrolysis device 2, as a preferred scheme, as shown in fig. 4. The flow divider 21 is a commercially available product.
The water is heated by the first heat exchanger and then enters the methane tank, the temperature of the methane tank is maintained between 25 and 60 ℃, and the volume ratio of carbon dioxide to hydrogen in the methane is 4 in the gas mixer.
In another scheme, as shown in fig. 3, the biogas purification device 7 includes a fan 14 connected to the gas storage 12, the fan 14 is connected to a filter 15, the filter 15 is connected to a drying tower 17, the drying tower 17 is connected to a desulfurizing tower 16, the desulfurizing tower 16 is connected to a gas mixer 13, the gas mixer 13 is connected to a methanation device 8, and the water electrolysis device 2 is connected to the gas mixer 13. The method is dry desulfurization, and figure 2 shows wet desulfurization.
Specifically, the biogas in the biogas digester is pressurized to 1-20bar by a fan, enters a filter for filtration and dust removal, is introduced into a drying tower for dehydration, and is desulfurized by a desulfurizing tower to obtain CH4And CO2The water enters the methane tank after being heated by the first heat exchanger, the temperature of the methane tank is kept between 25 and 60 ℃, and the volume ratio of carbon dioxide to hydrogen in the methane is 4 in the gas mixer.
The second heat exchanger 25 is connected with the temperature controller 22, and the temperature controller 22 is connected with the water electrolysis device 2 to realize temperature control. The second heat exchanger 25 heats water entering the water electrolysis device 2, and the principle is that the water is heated by methane, and the water is cooled by the methane due to the waste heat of the methane gas generated by the methanator, so that the water is convenient to convey or store.
Preferably, the water electrolysis device 2 is connected with the hydrogen storage tank 3 through the secondary gas-liquid separator 2a, and the hydrogen storage tank 3 is connected with the second heat exchanger 25. Here, the two-stage gas-liquid separator 2a is also referred to as a gas-liquid separator.
The first heat exchanger and the second heat exchanger are arranged, on one hand, the temperature of high-temperature gas coming out of the methanator needs to be reduced to normal temperature, meanwhile, cooling water is heated into high-temperature water or water vapor by heat released in the methanation process, then, part of the high-temperature water enters the electrolytic water device to prepare hydrogen through temperature control, and the other part of the high-temperature water enters the methane tank to maintain the methane operation temperature.
Before use, the catalyst needs to be activated and reduced, nitrogen is firstly introduced, the temperature is programmed to rise to 150 ℃, then the gas is changed into hydrogen, the hydrogen flow is 0.2 standard square hydrogen/h per kilogram of catalyst, the reaction is kept for 24h at the temperature of 150 ℃, and the reduction is finished.
The working temperature of the methanator is 300 ℃, nitrogen is firstly introduced to heat the reactor to 300 ℃, then the atmosphere is changed, mixed gas of methane and hydrogen is introduced, and the volume ratio H is controlled2/CO 24, most CO2 in the methane can be methanated through the secondary methanation of the first methanator 22 and the second methanator 23, the moisture of the reacted gas is removed, thereby obtaining the natural gas with the CH4 concentration of more than 95 percent,
the embodiment also provides a power energy storage method for preparing biogas by combining surplus power and biogas, wherein the renewable energy power generation device 1 inputs power to the water electrolysis device 2 after generating power, so that the water electrolysis device 2 electrolyzes water to generate hydrogen,
when the electricity is used at the valley point, the marsh gas generated by the marsh gas supply device 6 enters the methanation device 8 after being purified by the marsh gas purification device 7, the hydrogen generated by the water electrolysis device 2 enters the methanation device 8 to react with the carbon dioxide gas in the marsh gas to generate methane gas, the methane gas is stored in the biogas storage tank 9, the methane in the biogas storage tank 9 is input into the natural gas pipeline 10,
when the peak point of the electric power is used, the hydrogen generated by the water electrolysis device 2 is input into the fuel cell device 4, so that the chemical energy is converted into the electric energy, and the electric energy of the fuel cell device 4 is input into the municipal power grid 5, thereby realizing the peak clipping and valley filling of the electric power.
Specifically, at the peak point of the electric power usage, the methane in the biogas storage tank 9 is input into the fuel cell device 4, so that the chemical energy is converted into the electric energy, the electric energy of the fuel cell device 4 is input into the municipal power grid 5, and the carbon dioxide and the water generated by the fuel cell device 4 are respectively input into the methanation device 8 and the water electrolysis device 2, so as to provide raw materials for the methanation device 8 and the water electrolysis device 2.
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 biogas generating mechanism 1, the gas mixer 2, the hydrogen generating mechanism 3, the methanation device 4, the first heat exchanger 5, the first gas-liquid separator 6, the first water tank 7, the natural gas storage tank 8, the biogas digester 9, the biogas storage tank 10, the biogas purification assembly 11, the fan 12, the filter 13, the desulfurization tower 14, the drying tower 15, the temperature controller 16, the electrolytic water device 17, the flow divider 18, the second heat exchanger 19, the second gas-liquid separator 20, the second water tank 21, the first methanation device 22, the second methanation device 23, etc. are used more frequently herein, 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 (8)
1. An electric energy storage system for preparing biogas by combining surplus electric power and biogas is characterized by comprising a renewable energy power generation device (1), the renewable energy power generation device (1) is connected with the water electrolysis device (2), the water electrolysis device (2) is connected with the hydrogen storage tank (3), the hydrogen storage tank (3) is connected with a fuel cell device (4), the fuel cell device (4) is connected with a municipal power grid (5), and the device also comprises a methane supply device (6), the biogas supply device (6) is connected with a biogas purification device (7), the biogas purification device (7) is connected with a methanation device (8), the methanation device (8) is connected with a biogas storage tank (9), the biogas storage tank (9) is respectively connected with a fuel cell device (4) and a natural gas pipeline (10), and the hydrogen storage tank (3) is also connected with the methanation device (8).
2. The power energy storage system for producing biogas by combining surplus power and biogas according to claim 1, wherein the biogas supply device (6) comprises a biogas tank (11) and a gas storage tank (12) connected with the biogas tank (11), the gas storage tank (12) is connected with a biogas purification device (7), and the biogas purification device (7) is connected with the methanation device (8) through a gas mixer (13).
3. The electric energy storage system for jointly producing biogas by utilizing surplus electric power and biogas as claimed in claim 2, wherein the biogas purification device (7) comprises a fan (14) connected with the gas storage cabinet (12), the fan (14) is connected with a filter (15), the filter (15) is connected with a desulfurizing tower (16), the desulfurizing tower (16) is connected with a drying tower (17), the drying tower (17) is connected with a gas mixer (13), the methanation device (8) is connected with a gas-liquid separator (19) through a first heat exchanger (18), the gas-liquid separator (19) is connected with a biogas storage tank (9) and a water tank (20), the water tank (20) is connected with the biogas digester (11) through the first heat exchanger (18), and the water electrolysis device (2) is connected with the gas mixer (13).
4. The electric energy storage system for producing biogas by using surplus electric power and biogas in a combined manner according to claim 3, wherein the first heat exchanger (18) is connected with the biogas digester (11) and the temperature controller (22) through a flow divider (21), and the temperature controller (22) is connected with the water electrolysis device (2).
5. The power energy storage system for producing biogas by combining surplus power and biogas according to claim 2, wherein the biogas purification device (7) comprises a fan (14) connected with the gas holder (12), the fan (14) is connected with a filter (15), the filter (15) is connected with a drying tower (17), the drying tower (17) is connected with a desulfurizing tower (16), the desulfurizing tower (16) is connected with a gas mixer (13), the gas mixer (13) is connected with the methanation device (8), and the water electrolysis device (2) is connected with the gas mixer (13).
6. The electric energy storage system for producing biogas by combining surplus electric power and biogas according to claim 5, wherein the methanation device (8) comprises a first methanator (23) and a second methanator (24), the gas mixer (13) is connected with the first methanator (23), the first methanator (23) is connected with the second methanator (24) through a second heat exchanger (25), and the second methanator (24) is connected with the first heat exchanger (18).
7. The electric energy storage system for producing biogas by combining surplus electric power and biogas according to claim 6, wherein the second heat exchanger (25) is connected with a temperature controller (22), and the temperature controller (22) is connected with the water electrolysis device (2).
8. The power storage system for biogas production by combining surplus power and biogas according to claim 1, wherein the renewable energy power generation device (1) is a hydroelectric power station, a wind power station or a solar power station.
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| CN110467948A (en) * | 2019-06-21 | 2019-11-19 | 浙江臻泰能源科技有限公司 | Combine the electric energy storing system and method for bio-natural gas processed with biogas using electric power more than needed |
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| CN110467948A (en) * | 2019-06-21 | 2019-11-19 | 浙江臻泰能源科技有限公司 | Combine the electric energy storing system and method for bio-natural gas processed with biogas using electric power more than needed |
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