CN115404147A - CO sealed and stored in salt cavern gas storage 2 Biological methanation system and method - Google Patents

CO sealed and stored in salt cavern gas storage 2 Biological methanation system and method Download PDF

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Publication number
CN115404147A
CN115404147A CN202211026282.3A CN202211026282A CN115404147A CN 115404147 A CN115404147 A CN 115404147A CN 202211026282 A CN202211026282 A CN 202211026282A CN 115404147 A CN115404147 A CN 115404147A
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channel
salt cavern
salt
biomass
supercritical
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宗师
刘世奇
徐辉
皇凡生
曹泊
桑树勋
郑司建
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Jiangsu Design And Research Institute Of Geology And Mineral Resources Test Center Of China Coal Geology Administration
China University of Mining and Technology CUMT
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Jiangsu Design And Research Institute Of Geology And Mineral Resources Test Center Of China Coal Geology Administration
China University of Mining and Technology CUMT
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
    • C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
    • C12P5/023—Methane
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/007—Underground or underwater storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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Abstract

The invention discloses a method for sealing and storing CO in a salt cavern gas storage 2 The methanation system comprises: a salt cave cavity arranged underground; the first channel conveying device is provided with a first channel, the first channel is downwards extended to the salt cavern from the ground, and the first channel conveying device is configured to input the biomass garbage suspension or output the biomass reaction residues into the salt cavern; a second channel conveying device provided with a second channel communicated with the salt cavern cavity and configured to input supercritical CO into the salt cavern cavity 2 Or discharging methane from the salt cavern. The invention can meet the requirement of the supercritical CO sealing and storage of the underground salt cavern 2 While realizingSequestration of supercritical CO 2 The final product is high-quality biological methane gas which can be used as household and industrial fuel gas after simple treatment.

Description

CO sealed and stored in salt cavern gas storage 2 Biological methanation system and method
Technical Field
The invention relates to CO 2 The technical field of geological storage and utilization, in particular to CO storage in a salt cavern gas storage 2 Biological methanation systems and processes of (1).
Background
CO 2 The excessive emission of the greenhouse gases causes global warming, which is one of the serious challenges facing the human society today. In order to cope with climate change, countries around the world have taken a series of effective carbon reduction measures, among which CO 2 Geological sequestration and utilization is considered to be the most economical and effective carbon emission reduction scheme at present. Researches prove that the underground salt rock has extremely low permeability, good creep behavior and strong damage self-repairing capability, and salt cavern space (namely a salt cavern gas storage) artificially constructed in the underground salt rock can be used for sealing CO 2 The excellent geologic body of (2). At present, underground salt caverns are widely used as ideal places for storing petroleum, natural gas and high-radioactive nuclear waste, and have the advantages of large storage capacity, reliable safety performance, durability, low operation cost and the like.
Research proves that various microorganisms such as eurotium, firmicutes, proteobacteria, thermomonospora and the like are developed in the underground salt caverns, wherein the eurotium is the most developed and accounts for about 62-74%. Eurycota bacteria are commonly referred to as methanogens and can be divided into 6 orders of large order, namely methanobactriales, methanococcales, methanosarcinales, methanopyromyces, methanomicrobiales and methanosporiales. Methanogen strict anaerobeThe bacteria can be divided into methanogen hydrogenotrophus and methanogen acetogenic anaerobe. The methanogen hydrogenotrophus can utilize hydrogen to reduce carbon dioxide to generate methane and water (CO) 2 +4H 2 →CH 4 +2H 2 O); the methanogen acetophaga can directly decompose acetic acid to generate methane and carbon dioxide (CH) 3 COOH→CH 4 +CO 2 )。
Currently, CO is sequestered in respect of geology 2 Have been reported in coal-rock gas reservoirs as well as oil reservoirs. Chinese patent with application number 202111171518.8 discloses a carbon emission reduction method based on coal bed gas bioengineering, which takes acetic acid and hydrogen generated by decomposition in the microbial coal dissolving process as substrates and CO is subjected to the action of methanogen 2 Is converted into methane. Chinese patent with application number 201310479743.7 discloses a method for producing methane by activating methanogen in an oil reservoir to convert carbon dioxide, which comprises the steps of injecting acetic acid or acetate into the oil reservoir, oxidizing the acetic acid by acetic acid oxidizing bacteria to generate hydrogen, and utilizing the hydrogen and CO by the methanogen 2 Methane is generated. Hitherto, sequestration of CO in gas reservoirs for salt caverns 2 The biological methanation method is rarely reported. Existing geological sequestration of CO 2 The methanation technique of (a) is not suitable for salt cavern gas storage for the following reasons:
(1) Unlike coal-rock macromolecular organic matter, salt rock belongs to inorganic rock and cannot induce microbial fermentation to produce hydrogen, namely lack of CO 2 The hydrogen source condition required by methanation is difficult to realize CO under the condition of not supplementing organic matters 2 Biological methanation;
(2) CO sealed by salt cavern gas storage 2 Large amount of CO 2 The amount of nutrients required for methanation is also very large, and if organic acid or organic acid salt is injected into a gas reservoir to realize CO 2 The biological methanation brought higher economic cost.
Disclosure of Invention
Aiming at the problems and requirements, the scheme provides a method for sealing and storing CO in a salt cavern gas storage 2 The technical object is achieved by adopting the following technical characteristics, and the biological methanation system and the method thereofBringing other technical effects.
One purpose of the invention is to provide a method for storing CO in a salt cavern gas storage 2 The biological methanation system of (a), comprising:
a salt cave cavity arranged underground;
the first channel conveying device is provided with a first channel, the first channel is downwards extended to the salt cavern from the ground, and the first channel is configured to input the biomass garbage suspension or output the biomass reaction residues into the salt cavern;
a second channel conveying device provided with a second channel communicated with the salt cavern cavity and configured to input supercritical CO into the salt cavern cavity 2 Or discharging methane from the salt cavern.
In the technical scheme, firstly, supercritical CO is injected into the salt cavity from the second channel 2 Simultaneously, the brine is discharged from the first channel to treat the supercritical CO in the salt cavity 2 Sealing and storing, and carrying out microbial analysis on the discharged brine to determine that hydrogen-producing bacteria and methanogen hydrogenotrophicus simultaneously exist in the salt cavity; secondly, drying and crushing the collected biomass garbage, then preparing a biomass garbage suspension liquid by taking water as a background solution, pretreating the biomass garbage suspension liquid in a vacuum stirring box for a specified time, and then injecting the biomass garbage suspension liquid into a salt cavity from a first channel for biomass fermentation and supercritical CO 2 Methanation, and collecting methane produced in the salt cavity through a second channel; then, repeating the steps for a plurality of times until the supercritical CO sealed in the salt cavity 2 Is consumed up; finally, the methane in the salt cavity is discharged, and the supercritical CO is injected into the salt cavity from the second channel 2 Supercritical CO 2 And sealing and storing the biomass reaction residues and the waste liquid in the salt cavity, and discharging the reacted biomass reaction residues and the waste liquid out of the salt cavity through the first channel. The invention can meet the requirement of the supercritical CO sealing and storage of the underground salt cavern 2 At the same time, the supercritical CO can be sealed and stored 2 The final product is high-quality biological methane gas which can be used as household and industrial fuel gas after simple treatment; the invention adopts straw, kitchen garbage, excrement and other biomass garbage as raw materialsCO 2 The methanation provides a hydrogen source, the biomass garbage is convenient to obtain, simple to treat and low in cost, and the problem of environmental pollution caused by the biomass garbage can be solved; the biomass garbage fermentation residues in the invention can be used as feed, fertilizer and the like, and generate additional economic value.
In addition, the salt cavern gas storage stores CO in the invention 2 The biological methanation system can also have the following technical characteristics:
in one example of the present invention, the first lane transfer device includes:
and the pump body is connected to the first channel and is configured to apply driving force to the first channel so as to input biomass garbage suspension or output biomass reaction residues.
In one example of the present invention, the first lane transfer device further includes:
and the vacuum stirring box is communicated with the pump body and is configured to prepare the biomass garbage suspension under a vacuum condition.
In one example of the present invention, the first lane transfer device further includes:
a first valve installed on the first channel and configured to open or block the first channel;
the first pressure gauge is arranged on the first channel and is configured to monitor pressure information in the first channel in real time.
In one example of the present invention, the second passage transporting device includes:
a second valve installed on the second channel and configured to open or block the second channel;
and the second pressure gauge is arranged on the second channel and is configured to monitor the pressure information in the second channel in real time.
In one example of the invention, the first channel extends to the bottom of the salt cavern and the first channel is located inside the second channel; wherein the first channel and the second channel are not in communication with each other.
The invention also aims to provide the CO sealed and stored in the salt cavern gas storage 2 The biological methanation method comprises the following steps:
s10: injecting supercritical CO into the salt cavity from the second channel 2 Simultaneously, the brine is discharged from the first channel to treat the supercritical CO in the salt cavity 2 Sealing and storing, and carrying out microbial analysis on the discharged brine to determine that hydrogen-producing bacteria and methanogen hydrogenotrophus exist in the salt cavity at the same time;
s20: air-drying and crushing the collected biomass garbage, preparing a biomass garbage suspension liquid by taking water as a background solution, pretreating for a specified time in a vacuum stirring box, injecting the biomass garbage suspension liquid into a salt cavity from a first channel, and performing biomass fermentation and supercritical CO 2 Methanation, and collecting methane produced in the salt cavity through a second channel;
s30: repeating the step S20 for multiple times until the supercritical CO sealed in the salt cavity 2 Is consumed up;
s40: removing methane in the salt cavity, and injecting supercritical CO into the salt cavity from the second channel 2 Supercritical CO 2 And sealing and storing the biomass reaction residues in the salt cavity, and discharging the reacted biomass reaction residues out of the salt cavity through the first channel.
In one example of the present invention, the biomass waste is at least one of crop straw, human and livestock manure, weeds, food processing production waste, wood processing production waste, and domestic sludge.
In one example of the invention, the mass fraction of the biomass in the biomass waste suspension is 10-20%, the vacuum stirring pretreatment time of the biomass waste suspension is not less than 12h, and the stirring speed is 30-100 r/min.
In one example of the present invention, the pulverized biomass waste has a particle size of less than 0.83mm.
Compared with the prior art, the invention has the following advantages:
1) The invention can seal and store CO in the underground salt cavern 2 At the same time, the CO can be sequestered 2 The final product is high-quality biological methane gas which can be used as household and industrial fuel gas after simple treatment;
2) The invention adopts straw, kitchen garbage, excrement and other biomass garbage as CO 2 The methanation provides a hydrogen source, the biomass garbage is convenient to obtain, simple to treat and low in cost, and the problem of environmental pollution caused by the biomass garbage can be solved;
3) The granularity of the biomass garbage injected into the underground salt cavern is less than 0.83mm, residues after fermentation reaction are easy to clean from the salt cavern, and pipelines cannot be blocked, so that the space of the underground salt cavern is repeatedly utilized;
4) The biomass garbage fermentation residues in the invention can be used as feed, fertilizer and the like, and generate additional economic value.
The best mode for carrying out the invention will be described in greater detail below with reference to the accompanying drawings so that the features and advantages of the invention can be readily understood.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.
FIG. 1 shows sequestration of CO in a salt cavern gas reservoir according to an embodiment of the invention 2 The structural schematic diagram of the biological methanation system of (1);
FIG. 2 shows sequestration of CO in a salt cavern gas reservoir in accordance with an embodiment of the invention 2 A flow diagram of the biological methanation process of (1).
List of reference numerals:
a methanation system 100;
a salt cavern 110;
a biomass waste suspension 111;
supercritical CO 2 112；
Methane 113;
a first lane conveyor 120;
a first channel 121;
a pump body 122;
a vacuum stirring tank 123;
a first valve 124;
a first pressure gauge 125;
a second lane conveyor 130;
a second channel 131;
a second valve 132;
a second pressure gauge 133;
a formation 140;
a surface sleeve 150;
a technical sleeve 160;
the casing 170 is produced.
Detailed Description
In order to make the objects, technical solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
According to the first aspect of the invention, CO is sealed and stored in the salt cavern gas storage 2 As shown in fig. 1, the biological methanation system 100 includes:
a salt cavern 110 disposed underground;
a first channel conveying device 120 having a first channel 121, wherein the first channel 121 is downward from the ground to the salt cavern 110, and is configured to input the biomass waste suspension 111 into the salt cavern 110 or output biomass reaction residues;
a second channel conveying device 130 having a second channel 131, wherein the second channel 131 is communicated with the salt cavern 110 and is configured to input supercritical CO into the salt cavern 110 2 112 or methane 113 is removed from the salt cavern 110.
Firstly, injecting supercritical CO into the salt cavern 110 from the second channel 131 2 112 while discharging brine from the first channel 121 to the supercritical CO in the salt cavern 110 2 112, sealing and storing, and carrying out microbial analysis on the discharged brine to determine that hydrogen-producing bacteria and methanogen hydrogenotrophus exist in the salt cavity 110; secondly, the collected biomass waste is air-dried and crushed, then a biomass waste suspension 111 is prepared by taking water as a background solution, the biomass waste suspension is pretreated in a vacuum stirring box 123 for a specified time, and then the biomass waste suspension 111 is injected into the salt cavern 110 from a first channel 121 for biomass fermentation and supercritical CO 2 112 methanation and the second channel 131 collects the methane 113 produced in the salt cavern 110; then, the above steps are repeated for a plurality of times until the supercritical CO sealed in the salt cavern 110 is obtained 2 112 is depleted; finally, the methane 113 in the salt cavern 110 is discharged, and the supercritical CO is injected into the salt cavern 110 through the second channel 131 2 112, mixing the supercritical CO 2 112 are sealed in the salt cavern 110 and react to obtain biomassThe reaction residue exits the salt cavern 110 through the first passage 121. The invention can meet the requirement of the supercritical CO for sealing and storing the underground salt cavern 2 112 and can realize the sequestration of supercritical CO 2 112, the final product is high-quality biological methane gas which can be used as household and industrial fuel gas after simple treatment; the invention adopts straw, kitchen garbage, excrement and other biomass garbage as supercritical CO 2 112, the biomass garbage is convenient to obtain, simple to treat and low in cost, and the problem of environmental pollution caused by the biomass garbage can be solved; the biomass garbage fermentation residues in the invention can be used as feed, fertilizer and the like, and additional economic value is generated.
In one example of the invention, the system further comprises a surface casing 150, a technology casing 160 and a production casing 170, wherein the technology casing 160 is located within said surface casing 150, the production casing 170 is located within said technology casing 160, the production casing 170 is lowered to a depth close to the salt cavern 110, and the depth of the surface casing 150 is less than the depth of the technology casing 160 than the depth of the production casing 170; specifically, during drilling, the first section is drilled, the surface casing 150 is run in and well-cemented, then the second section is drilled, the technical casing 160 is run in and well-cemented, and finally the third section is drilled, the production casing 170 is run in and well-cemented. Production casing 170 is also a passage for gas storage injection and production fluids. Cement is injected between the surface casing 150 and the formation 140, between the surface casing 150 and the technical casing 160, between the technical casing 160 and the production casing 170, and between the production casing 170 and the formation 140 to provide reinforcement and sealing.
For example, the production casing 170, the technical casing 160 and the surface casing 150, and the first passage 121 and the second passage 131 are all steel pipes;
it will be appreciated that the second passageway 131 may be a separate conduit or a passageway defined by the production casing 160 and the first passageway 121.
In one example of the present invention, the first lane transfer device 120 includes:
a pump body 122 connected to the first channel 121 and configured to apply a driving force to the first channel 121 to input a biomass waste suspension or output a biomass reaction residue;
that is, the pump body 122 can be rotated forward and backward to apply a driving force to the biomass waste suspension in the vacuum stirring tank described below and input the suspension into the salt cavern 110, or to apply a driving force to the biomass reaction residue in the salt cavern after the reaction is completed and extract the biomass reaction residue out of the salt cavern 110.
Can be convenient carry biomass waste to the salt cave in to delivery pressure in first passageway 121 through setting up pump body 122, also can conveniently take biomass waste residue and waste liquid out salt cave chamber 110 by first passageway 121 simultaneously.
In one example of the present invention, the first channel conveying device 120 further includes:
and the vacuum stirring tank 123 is communicated with the pump body 122 and is configured to prepare the biomass waste suspension 111 under vacuum conditions, for example, the vacuum stirring pretreatment time of the biomass waste suspension 111 is not less than 12 hours, the stirring speed is 30 to 100r/min, and the biomass waste suspension 111 can be conveniently formed by arranging the vacuum stirring tank 123.
Because anaerobic organisms are in the salt cavern 110, the biomass garbage suspension 111 needs to be input under a vacuum condition, and the vacuum stirring box 123 mainly has two functions, namely, the biomass garbage suspension is vacuumized; secondly, the biomass waste suspension 111 is stirred to avoid blocking the first channel 121.
In one example of the present invention, the first channel conveying device 120 further includes:
a first valve 124 installed on the first passage 121 and configured to open or block the first passage 121;
the biomass waste suspension or the biomass reaction residue can be fed into the salt cavern 110 by opening the first valve 124, while the first channel 121 can be blocked by closing the first valve 124. For example, injecting supercritical CO into the salt cavern 110 2 When it is necessary to open the second valve 132 while the first valve 124 is opened.
The first pressure gauge 125 is installed on the first channel 121, and is configured to monitor pressure information in the first channel 121 in real time, generally, the working pressure in the salt cavern 110 needs to be smaller than an upper limit pressure for safe operation thereof, and the working pressure state of the system can be obtained in real time through the first pressure gauge 125, so as to facilitate safe operation thereof.
In one example of the present invention, the second lane delivery device 130 includes:
a second valve 132 installed on the second channel 131 and configured to open or block the second channel 131;
supercritical CO can be introduced into the salt cavern 110 by opening the second valve 132 2 Or outputs methane gas, and the second passage 131 can be blocked by closing the second valve 132. For example, when the biomass waste suspension 111 is injected into the salt cavern 110, the first valve 124 is opened, the second valve 132 is closed, and the second valve 132 is opened and the first valve 124 is closed at the proper time according to the gas pressure of methane gas generated in the salt cavern 110.
The second pressure gauge 133 is installed on the second channel 131, and is configured to monitor pressure information in the second channel 131 in real time, generally, the working pressure in the salt cavern 110 needs to be smaller than the upper limit pressure of safe operation thereof, so that the working pressure state of the system can be obtained in real time through the second pressure gauge 133, and the safe operation thereof is facilitated.
In one example of the present invention, the first channel 121 extends to the bottom of the salt cavern 110, and the first channel 121 is located inside the second channel 131; wherein the first channel 121 and the second channel 131 are not conducted with each other. Extending the first channel 121 to the bottom of the salt cavern 110 can achieve sufficient reaction of the biomass waste suspension 111, and the methane gas generated in the salt cavern 110 is transported to the ground along the second channel 131.
According to a second aspect of the invention, the CO is stored in the salt cavern gas storage 2 The biological methanation process of (1), as shown in FIG. 2,the method comprises the following steps:
s10: injecting supercritical CO into the salt cavern 110 from the second channel 131 2 112 while discharging brine from the first channel 121 to the supercritical CO in the salt cavern 110 2 112, sealing and performing microbial analysis on the discharged brine to determine that hydrogen-producing bacteria and methanogen hydrogenotrophus simultaneously exist in the salt cavern cavity 110; it is noted that the brine may be prepared from supercritical CO 2 112 into the salt cavern 110, the pressure in the salt cavern 110 is increased, so that brine is discharged along the first passage 121, or pumped by the pump body 122.
S20: air drying and crushing the collected biomass waste, preparing a biomass waste suspension 111 by using water as a background solution, pretreating in a vacuum stirring box 123 for a specified time, injecting the biomass waste suspension 111 into a salt cavern 110 through a first channel 121, and performing biomass fermentation and supercritical CO 2 112 methanation and the second channel 131 collects the methane 113 produced in the salt cavern 110;
s30: repeating the step S20 for a plurality of times until the supercritical CO sealed in the salt cavern 110 is stored 2 112 is depleted;
s40: the methane 113 in the salt cavern 110 is discharged and the supercritical CO is injected into the salt cavern 110 from the second channel 131 2 112, mixing the supercritical CO 2 112 are sealed in the salt cavern 110, and the reacted biomass reaction residues are discharged out of the salt cavern 110 through the first channel 121.
The method can meet the requirement of underground salt cavern sealing up supercritical CO 2 112 and can realize the storage of supercritical CO 2 112, the final product is high-quality biological methane gas which can be used as household and industrial fuel gas after simple treatment; the method adopts straw, kitchen garbage, excrement and other biomass garbage as supercritical CO 2 112, the biomass garbage is convenient to obtain, simple to treat and low in cost, and the problem of environmental pollution caused by the biomass garbage can be solved; the biomass garbage fermentation residues in the method can be used as feed, fertilizer and the like, and additional economic value is generated.
In one example of the present invention, the biomass waste is at least one of crop straw, human, animal and poultry manure, weeds, food processing production waste, wood processing production waste, and domestic sludge.
In one example of the invention, the mass fraction of the biomass in the biomass waste suspension 111 is 10% -20%, the vacuum stirring pretreatment time of the biomass waste suspension 111 is not less than 12h, and the stirring speed is 30-100 r/min.
In one example of the invention, the particle size of the pulverized biomass waste is less than 0.83mm (20 meshes), and the particle size of the biomass waste injected into the underground salt cavern is less than 0.83mm, so that residues after fermentation reaction are easily cleaned out of the salt cavern, and pipelines cannot be blocked, and the recycling of the underground salt cavern space is ensured.
The sequestration of CO in a salt cavern gas reservoir proposed by the present invention is described in detail above with reference to preferred embodiments 2 While the present invention has been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. CO sealed and stored in salt cavern gas storage 2 The biological methanation system of (2), characterized by, including:
a salt cavern (110) arranged underground;
a first channel conveying device (120) which is provided with a first channel (121), wherein the first channel (121) is descended from the ground to the salt cavern (110) and is configured to input the biomass garbage suspension (111) or output biomass reaction residues into the salt cavern (110);
a second channel conveying device (130) having a second channel (131), the second channel (131) being in communication with the salt cavern (110) and configured to convey the salt cavern (11) to the salt cavern0) Internal input of supercritical CO 2 (112) Or discharging methane (113) from the salt cavern (110).
2. The method of claim 1 for sequestration of CO in a gas reservoir in a salt cavern 2 The biological methanation system is characterized in that,
the first lane conveyor (120) includes:
and the pump body (122) is connected to the first channel (121) and is configured to apply driving force to the first channel (121) so as to input the biomass waste suspension or output the biomass reaction residues.
3. The salt cavern gas reservoir sequestration of CO of claim 1 2 The biological methanation system is characterized in that,
the first lane transfer device (120) includes:
a vacuum agitator tank (123) in communication with the pump body (122) configured to prepare a biomass waste suspension (111) under vacuum conditions.
4. The method of claim 1 for sequestration of CO in a gas reservoir in a salt cavern 2 The biological methanation system is characterized in that,
the first lane transfer device (120) includes:
a first valve (124) installed on the first passage (121) and configured to open or block the first passage (121);
a first pressure gauge (125) mounted on the first channel (121) configured to monitor pressure information within the first channel (121) in real time.
5. The salt cavern gas reservoir sequestration of CO of claim 1 2 The biological methanation system is characterized in that,
the second lane conveyor (130) comprises:
a second valve (132) installed on the second channel (131) and configured to open or block the second channel (131);
a second pressure gauge (133) mounted on the second channel (131) configured to monitor pressure information within the second channel (131) in real time.
6. The salt cavern gas reservoir sequestration of CO of claim 1 2 The biological methanation system is characterized in that,
the first channel (121) extends to the bottom of the salt cavern (110), and the first channel (121) is located inside the second channel (131); wherein the first channel (121) and the second channel (131) are not in communication with each other.
7. The sequestered CO in the salt cavern gas storage of any one of claims 1 to 6 2 The methanation method of the biological methanation system is characterized by comprising the following steps:
s10: injecting supercritical CO into the salt cavity (110) from the second channel (131) 2 (112) Simultaneously, the brine is discharged from the first channel (121) to treat the supercritical CO in the salt cavern cavity (110) 2 (112) Sealing and storing, and carrying out microbial analysis on the discharged brine to determine that hydrogen-producing bacteria and methanogen hydrogenotrophus exist in the salt cavity (110) at the same time;
s20: drying and crushing the collected biomass garbage, preparing a biomass garbage suspension (111) by using water as a background solution, pretreating in a vacuum stirring box (123) for a specified time, injecting the biomass garbage suspension (111) into a salt cavern (110) from a first channel (121), and performing biomass fermentation and supercritical CO 2 (112) Methanation, and methane (113) produced in the salt cavern (110) is collected by a second channel (131);
s30: repeating the step S20 for a plurality of times until the supercritical CO sealed in the salt cavern cavity (110) 2 (112) Is consumed up;
s40: the methane (113) in the salt cavity (110) is discharged, and the supercritical CO is injected into the salt cavity (110) from the second channel (131) 2 (112) Supercritical CO 2 (112) Is sealed in the salt cavity (110), and the reacted biomass reaction residue is discharged out of the salt cavity (110) through the first channel (121).
8. The salt cavern gas reservoir sequestration of CO of claim 7 2 The biological methanation method is characterized in that,
the biomass garbage is at least one of crop straws, human, livestock and poultry manure, weeds, food processing production waste, wood processing production waste and domestic sludge.
9. The method of claim 7 wherein the CO is sequestered in the gas storage reservoir of the salt cavern 2 The biological methanation method is characterized in that,
the biomass mass fraction of the biomass waste suspension (111) is 10-20%, the vacuum stirring pretreatment time of the biomass waste suspension (111) is not less than 12h, and the stirring speed is 30-100 r/min.
10. The salt cavern gas reservoir sequestration of CO of claim 7 2 The biological methanation method is characterized in that,
the particle size of the pulverized biomass garbage is less than 0.83mm.
CN202211026282.3A 2022-08-25 2022-08-25 CO sealed and stored in salt cavern gas storage 2 Biological methanation system and method Pending CN115404147A (en)

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