CN114811404A - Coal mine underground portable carbon dioxide storage device and use method thereof - Google Patents

Coal mine underground portable carbon dioxide storage device and use method thereof Download PDF

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Publication number
CN114811404A
CN114811404A CN202210348126.2A CN202210348126A CN114811404A CN 114811404 A CN114811404 A CN 114811404A CN 202210348126 A CN202210348126 A CN 202210348126A CN 114811404 A CN114811404 A CN 114811404A
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Prior art keywords
cavity
carbon dioxide
working
main body
sealing
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CN114811404B (en
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张春华
吴鑫
陈金全
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Liaoning Technical University
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Liaoning Technical University
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    • 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
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/08—Integral reinforcements, e.g. ribs
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/06—Closures, e.g. cap, breakable member
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • F17C13/084—Mounting arrangements for vessels for small-sized storage vessels, e.g. compressed gas cylinders or bottles, disposable gas vessels, vessels adapted for automotive use
    • 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/012—Reinforcing means on or in the wall, e.g. ribs
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0678—Concrete
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/219—Working processes for non metal materials, e.g. extruding
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0138—Single phase solid
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/011—Improving strength
    • 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
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/042—Reducing risk of explosion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)

Abstract

The invention provides a portable underground carbon dioxide storage device for a coal mine, which comprises a cavity, wherein a semi-closed hollow cavity is arranged in the cavity, a charging hole is formed in the top end of the cavity, a sealing film is fixed in the hollow cavity of the cavity, a sealing cover is arranged at the charging hole, and the sealing cover and the cavity are fixed in an auxiliary mode through a cylindrical pin. When the working main body is used for building a fireproof airtight wall of an auxiliary airtight wall or a U-shaped ventilation working surface on the inner side of the roof cutting roadway and filling a goaf, the goaf air leakage channel behind the working surface frame can be reduced, and carbon dioxide can be effectively stored by the working main body during the stoping period of the working surface; after the working face is completely mined, the working main body is completely retained in the closed mined-out area, part of the working main body is broken under the action of roof caving and underground water, solid carbon dioxide in the working main body leaks, and formed gaseous carbon dioxide can inert residual coal in the mined-out area and is used for fire prevention and fire extinguishment.

Description

Coal mine underground portable carbon dioxide storage device and use method thereof
Technical Field
The invention belongs to the technical field of underground carbon dioxide storage, and particularly relates to a portable underground carbon dioxide storage device for a coal mine and a using method thereof.
Background
The coal gangue is waste residue generated in the coal mining and processing process, which is about 12 percent of the coal yield, and the coal gangue pile mostly sits near a coal mine, occupies residential land, cultivated land, woodland and the like, and wastes the land resources; in addition, the coal gangue is kept for a long time, the image of a coal mining area is damaged to a great extent, a large amount of mineral elements contained in the coal gangue can permeate into soil to pollute the soil, and therefore a technical method for treating and utilizing the coal gangue is needed.
How to deal with the carbon dioxide gas emission is the problem that needs to solve urgently, is reducing the emission of greenhouse gas of this country through various efforts at present, and carbon capture is stored and is utilized the technique and receive unprecedented attention and development, and mine carbon dioxide fire prevention and extinguishing technology obtains preliminary popularization and application, but no matter gaseous or liquid carbon dioxide all has certain risk when storing, filling, transportation and application.
China is the largest world coal producing and consuming country, and according to statistics, more than 130 large and medium mining areas of 25 main coal producing provinces in China are threatened by natural ignition of coal beds to different degrees. 657 in China, the number of mines with coal seams tending to spontaneously ignite accounts for 54.9%. The number of mines with the shortest natural fire period less than 3 months accounts for more than 50 percent, and spontaneous combustion fire seriously influences the safe production of coal mines. The goaf is the main place where spontaneous combustion fires occur, and the air leakage of the goaf is the fundamental reason for spontaneous combustion.
Therefore, the device for storing the carbon dioxide in the coal mine underground in a portable manner and the using method thereof are provided.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a portable device for storing carbon dioxide in a coal mine and a method for using the same, aiming at the defects of the prior art, so as to solve the problems proposed in the background art.
In order to solve the technical problems, the invention adopts the technical scheme that: the device for storing carbon dioxide in a coal mine underground in a portable mode comprises a cavity, wherein a semi-closed hollow cavity is arranged in the cavity, a charging hole is formed in the top end of the cavity, a sealing film is fixed in the hollow cavity of the cavity, a sealing cover is arranged at the position, close to the top end, of the side wall of the cavity, a pin shaft through hole is reserved, a pin shaft blind hole is reserved at the side end of the sealing cover, and the sealing cover and the cavity are fixed in an auxiliary mode through a cylindrical pin.
Further, the cavity is specifically a cuboid or a cylinder, the cavity is of a high-pressure-bearing coal gangue reinforced concrete structure, and the high-pressure-bearing coal gangue reinforced concrete structure is formed by pouring coal gangue concrete and a steel reinforcement framework.
Further, the seal membrane is the rubber material, just the shape of seal membrane is the same with the shape of cavity in the cavity, the sealed mode of seal membrane is for gluing.
Furthermore, the charging hole and the sealing cover are of mutually matched circular truncated cone structures, solid carbon dioxide is filled into the sealing film of the cavity through the charging hole, the sealing film is sealed by cementing, then the sealing cover is inserted into the charging hole, the cylindrical pin is inserted into the pin shaft through hole of the reserved cavity and the pin shaft blind hole of the sealing cover, and the sealing cover is clamped tightly to form the working main body.
A method for using a portable carbon dioxide storage device in a coal mine well comprises the steps of firstly preparing a cavity, a sealing film and a sealing cover of the device on the ground, and conveying the device and a separately stored solid carbon dioxide device to a working face in the well through a mine conveying system; filling solid carbon dioxide into the cavity of the device in the underground working face, and sealing to form a working main body;
then, the working main body is used for building an auxiliary sealing wall on the inner side of a roof cutting entry of a working face under stoping, and used for building fireproof sealing walls at certain intervals at the upper end and the lower end of a goaf of a U-shaped ventilation working face under stoping, or used for putting the fireproof sealing walls into the goaf through the upper corner and the lower corner of the working face under stoping;
when the working main body is used for building an auxiliary sealing wall on the inner side of the roof cutting entry retaining of the working face under stoping, entry retaining airflow can be prevented from leaking into a goaf and harmful gas in the goaf is prevented from leaking out, and carbon dioxide can be effectively stored in the stoping period of the working face;
when the working main body is used for building the fireproof sealing walls at certain intervals at the upper end and the lower end of the goaf of the U-shaped ventilation working face in stoping, the air leakage of the stoping working face through the air leakage channel of the O ring at the periphery of the goaf can be prevented. The working body can be used for storing carbon dioxide during the working face extraction period;
when the working main body is filled in the goaf, the goaf air leakage channel behind the working face frame can be reduced, and carbon dioxide can be effectively stored by the working main body during the working face stoping period;
after the working face is completely mined, the working main body is completely retained in the closed mined-out area, part of the working main body is broken under the action of roof caving and underground water, solid carbon dioxide in the working main body leaks, and formed gaseous carbon dioxide can inert residual coal in the mined-out area and is used for fire prevention and fire extinguishment.
Compared with the prior art, the invention has the following advantages:
according to the invention, the coal gangue is used for replacing coarse and fine aggregates in concrete, so that not only is the waste utilized, but also the land resource is saved, the device has multiple purposes, the device can store carbon dioxide, the cuboid device can also be used for building an auxiliary sealing wall in a top-cutting entry retaining or building a fireproof sealing wall at the upper end and the lower end of a traditional working face, the cylindrical device can be used for filling a goaf, when a working main body is used for building the auxiliary sealing wall on the inner side of the top-cutting entry retaining of the working face which is being stoped, the entry retaining airflow can be prevented from leaking into the goaf and leaking out harmful gas in the goaf, and carbon dioxide can be effectively stored during the stoping period of the working face; when the working main body is used for building the fireproof sealing walls at certain intervals at the upper end and the lower end of the goaf of the U-shaped ventilation working face in stoping, the air leakage of the stoping working face through an air leakage channel of an O ring at the periphery of the goaf can be prevented, and carbon dioxide can be stored in the stoping period of the working face by using the working main body; when the working main body is filled in the goaf, the goaf air leakage channel behind the working face frame can be reduced, and carbon dioxide can be effectively stored by the working main body during the working face stoping period; after the working face is completely mined, the working main body is completely retained in the closed mined-out area, part of the working main body is broken under the action of roof caving and underground water, solid carbon dioxide in the working main body leaks, and formed gaseous carbon dioxide can inert residual coal in the mined-out area and is used for fire prevention and fire extinguishment.
Drawings
FIG. 1 is a cross-sectional view of the overall construction of the present invention;
FIG. 2 is a schematic view in half section of the overall structure of the present invention;
FIG. 3 is a schematic view of a roof cutting, pressure relief and entry retaining face of the present invention;
fig. 4 is a schematic view of a U-shaped ventilation work surface of the present invention.
Description of reference numerals:
1-a cavity; 2-sealing the film; 3-sealing the cover; 4-cylindrical pins; 5-laneway; 6-working surface; 7-temporary containment walls; 8-a working body; 9-auxiliary airtight wall; 10-a goaf; 11-fireproof airtight wall; 12-section coal pillar.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, the present invention provides a technical solution: a portable underground carbon dioxide storage device for a coal mine comprises a cavity 1, wherein a semi-closed hollow cavity is arranged in the cavity 1, the cavity 1 is specifically a cuboid or a cylinder, and a charging hole is formed in the top end of the cavity 1;
in the embodiment, the outer dimension of the cavity 1 structure is 200mm × 200mm × 180mm, the inner structure is a circular truncated cone charging hole with a diameter of 80mm, a height of 100mm, a cylindrical cavity, a lower bottom, an upper bottom and a height of 50mm, and the diameter of the lower bottom is 80 mm.
Cavity 1 is high pressure-bearing gangue reinforced concrete structure, and high pressure-bearing gangue concrete structure is pour by coal gangue concrete and framework of steel reinforcement, and the framework is regarded as to the steel reinforcement, has increased substantially the compressive strength of device, and coal gangue concrete is made by coal waste residue, cement and the water that generate in the mining course of working, and the substitution rate that the gangue is used for the coarse and fine aggregate is 100%, and the coarse aggregate particle diameter is 20mm, and the fine aggregate particle diameter is 5mm to use No. C40 cement, the framework of steel reinforcement is lived to coal gangue concrete parcel, the thick 20mm of coal gangue concrete in the framework of steel reinforcement outside.
The steel bar framework comprises two parts, wherein one part is a longitudinal bar, and the other part is a stirrup. The cavity 1 is provided with 8 longitudinal ribs in total, the stirrups are fixed on the longitudinal ribs at a position 10mm away from the bottom end of the cavity 1, and then the stirrups are fixed at intervals of 40 mm; the longitudinal bar is HRB335 steel bar with the diameter of 14mm, and the processing length of the longitudinal bar is 180 mm; the stirrups are made of HPB300 steel bars with the diameter of 6mm, and the processing length of the stirrups is 1375 mm.
The cavity intracavity of cavity 1 is fixed with seal membrane 2, seal membrane 2 is the rubber material, just the shape of seal membrane 2 is the same with the shape of cavity in the cavity 1, the sealed mode of seal membrane 2 is for gluing.
The feeding hole is provided with a sealing cover 3, a pin shaft through hole is reserved on the side wall of the cavity 1 close to the top end, a pin shaft blind hole is reserved on the side end of the sealing cover 3, and the sealing cover 3 and the cavity 1 are fixed in an auxiliary mode through a cylindrical pin 4.
The charging hole and the sealing cover 3 are of mutually matched round platform structures, solid carbon dioxide is filled into the sealing film 2 of the cavity 1 through the charging hole, the sealing film 2 is sealed by cementing, then the sealing cover 3 is inserted into the charging hole, the cylindrical pin 4 is inserted into the pin shaft through hole of the reserved cavity 1 and the pin shaft blind hole of the sealing cover 3, and the sealing cover 3 is clamped tightly to form the working main body 8.
As shown in fig. 3-4, a method for using a portable carbon dioxide storage device in a coal mine well comprises the steps of preparing a cavity 1, a sealing film 2 and a sealing cover 3 of the device on the ground, and conveying the device and a solid carbon dioxide device which is stored separately to a working face in the well through a mine conveying system; filling solid carbon dioxide into the cavity 1 of the device in the underground working face, and sealing to form a working main body 8;
then, the working main body 8 is used for building an auxiliary sealing wall 9 on the inner side of a roof cutting retained roadway of the working face 6 under stoping and used for building the upper end and the lower end of a U-shaped ventilation working face goaf 10 under stoping at intervals to build a fireproof sealing wall or used for throwing the fireproof sealing wall into the goaf 10 through the upper corner and the lower corner of the working face 6 under stoping;
when the working main body 8 is used for building the auxiliary sealing wall 9 on the inner side of the roof cutting entry retaining of the working face 6 under stoping, the entry retaining air current can be prevented from leaking into the goaf 10 to cause harmful gas to leak out, and carbon dioxide can be effectively stored during the stoping period of the working face 10;
when the working main body 8 is used for building the fireproof sealing walls at certain intervals at the upper and lower ends of the mined-out area 10 of the U-shaped ventilation working face under stoping, the non-stoping working face can be prevented from leaking air through an air leakage channel of an O ring at the periphery of the mined-out area, and carbon dioxide can be stored in the working main body 8 during the stoping period of the working face;
when the working main body 8 is filled in the goaf 10, the goaf air leakage channel behind the working face 6 can be reduced, and carbon dioxide can be effectively stored by the working main body 8 during the stoping period of the working face 6;
after the working face is completely mined, the working main body 8 is completely retained in the closed mined-out area 10, part of the working main body is broken under the action of roof caving and underground water, solid carbon dioxide in the working main body 8 leaks, and formed gaseous carbon dioxide can inert residual coal in the mined-out area and is used for fire prevention and fire extinguishment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A portable device for storing carbon dioxide in a coal mine underground is characterized in that: the sealing device comprises a cavity (1), wherein a semi-closed hollow cavity is arranged in the cavity (1), a charging hole is formed in the top end of the cavity (1), a sealing film (2) is fixed in the hollow cavity of the cavity (1), a sealing cover (3) is arranged at the position of the charging hole, a pin shaft through hole is reserved in the position, close to the top end, of the side wall of the cavity (1), a pin shaft blind hole is reserved in the side end of the sealing cover (3), and the sealing cover (3) and the cavity (1) are fixed in an auxiliary mode through a cylindrical pin (4).
2. The device for storing carbon dioxide in a coal mine underground in a portable manner according to claim 1, wherein the cavity (1) is a cuboid or a cylinder, the cavity (1) is a high-pressure coal gangue reinforced concrete structure, and the high-pressure coal gangue reinforced concrete structure is formed by pouring coal gangue concrete and a steel reinforcement framework.
3. The device for storing carbon dioxide in a coal mine underground in a portable manner according to claim 1, wherein the sealing membrane (2) is made of rubber, the shape of the sealing membrane (2) is the same as that of a hollow cavity in the cavity (1), and the sealing mode of the sealing membrane (2) is cementing.
4. The device for storing carbon dioxide in a coal mine underground in a portable manner is characterized in that the charging port and the sealing cover (3) are of mutually matched circular truncated cone structures, solid carbon dioxide is filled into the sealing film (2) of the cavity (1) through the charging port, the sealing film (2) is sealed by cementing, then the sealing cover (3) is inserted into the charging port, the cylindrical pin (4) is inserted into the pin shaft through hole of the reserved cavity (1) and the pin shaft blind hole of the sealing cover (3), and the sealing cover (3) is clamped tightly to form the working body (8).
5. The use method of the portable underground coal mine carbon dioxide storage device according to any one of claims 1 to 4, characterized in that the cavity (1), the sealing film and the sealing cover of the device are prepared on the ground and are transported to a downhole working face together with the separately stored solid carbon dioxide device through a mine transportation system; filling solid carbon dioxide into the cavity (1) of the device in the underground working surface, and sealing to form a working main body (8);
then, the working main body (8) is used for building an auxiliary sealing wall (9) on the inner side of a roof cutting entry of the working face (6) being stoped and building the upper end and the lower end of a U-shaped ventilation working face goaf (10) being stoped at intervals of a preset distance, or used for putting the fire-proof sealing wall (11) into the goaf (10) through the upper corner and the lower corner of the working face (6) being stoped;
when the working main body (8) is used for building the auxiliary sealing wall (9) on the inner side of the roof cutting entry retaining of the working face (6) in stoping, the entry retaining airflow can be prevented from leaking into the goaf (10) and harmful gas in the goaf (10) from leaking out, and carbon dioxide can be effectively stored during stoping of the working face (10);
when the working main body (8) is used for building the fireproof sealing walls at preset intervals at the upper end and the lower end of a mined-out area (10) of the U-shaped ventilation working face under the stoping process, the non-stoping working face can be prevented from leaking air through an air leakage channel of an O ring at the periphery of the mined-out area, and carbon dioxide can be stored during the stoping process of the working face by using the working main body (8);
when the working main body (8) is filled in the goaf (10), the goaf air leakage channel behind the working face (6) can be reduced, and carbon dioxide can be effectively stored by the working main body (8) during the stoping period of the working face (6);
after the working face is completely stoped, the working main body (8) is completely retained in the closed goaf (10), part of the working main body is broken under the action of roof caving and underground water, solid carbon dioxide in the working main body (8) leaks, and formed gaseous carbon dioxide can inert residual coal in the goaf and is used for fire prevention and fire extinguishing.
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