CN113404538B - System and method for sealing carbon dioxide based on coal mine goaf - Google Patents
System and method for sealing carbon dioxide based on coal mine goaf Download PDFInfo
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- CN113404538B CN113404538B CN202110744815.0A CN202110744815A CN113404538B CN 113404538 B CN113404538 B CN 113404538B CN 202110744815 A CN202110744815 A CN 202110744815A CN 113404538 B CN113404538 B CN 113404538B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 95
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 95
- 238000007789 sealing Methods 0.000 title claims abstract description 54
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 65
- 239000007924 injection Substances 0.000 claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 39
- 238000012806 monitoring device Methods 0.000 claims abstract description 28
- 238000003860 storage Methods 0.000 claims abstract description 19
- 238000005452 bending Methods 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000009919 sequestration Effects 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000011083 cement mortar Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 56
- 239000000243 solution Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to the technical field of carbon dioxide emission reduction, and particularly discloses a system and a method for sealing carbon dioxide based on a coal mine goaf, wherein the system comprises the following steps: a carbon dioxide temporary storage device; the underground closed space is positioned in the caving zone goaf and is used for sealing and storing carbon dioxide, and the underground closed space is formed by surrounding a protective coal pillar, a well field boundary protective coal pillar and a closed roadway in the coal mine goaf; the gas injection device comprises a gas injection pipeline communicated with the carbon dioxide temporary storage device, and the gas injection pipeline sequentially penetrates through the bending subsidence zone and the fracture zone and extends into the underground closed space; at least one monitoring device includes a monitoring conduit extending through the bending dip zone and the fracture zone and into the underground enclosure. The invention can economically, efficiently and massively seal and store a large amount of carbon dioxide, and can be used for pumping and reutilizing the carbon dioxide as a resource when necessary, thereby realizing convenient sealing and subsequent use of the carbon dioxide.
Description
Technical Field
The invention relates to the technical field of carbon dioxide emission reduction, and particularly discloses a system and a method for sealing carbon dioxide based on a coal mine goaf.
Background
At present, a carbon dioxide release unit of a thermal power plant, a coal chemical industry and the like is successively constructed, and a carbon dioxide capturing and sealing project (CCS) is put into use so as to achieve the aim of carbon dioxide emission reduction. Along with the development and construction for many years, the industrial trapping of carbon dioxide is mature, but the sealing mode still does not realize breakthrough, and the current sealing mode of carbon dioxide comprises the following steps: geological sequestration is the sequestration of carbon dioxide using the crevices and containment capabilities of a particular formation. One such method is to inject carbon dioxide into an oil and gas well and sequester the carbon dioxide by utilizing the space-containing capacity of the oil and gas well. With the research of carbon dioxide sequestration technology for more than 10 years, the mode is relatively mature. And secondly, a geological saline water layer is searched, and carbon dioxide is injected under high pressure by utilizing the water dissolving capacity and space gaps of the saline water layer, so that the sealing and storing purpose is realized, and the sealing and storing capacity of the carbon dioxide is limited and limited by geological conditions. 2. Marine sequestration: carbon dioxide is injected into the deep sea and is sequestered at the sea floor in a higher density than the sea water under sea water pressure conditions. The ocean sequestration depth is typically 3000 meters, 300 atmospheres. 3. And (3) surface chemical sealing: carbon dioxide is reacted with calcium oxide or magnesium hydroxide minerals to form carbonate solids. 4. And (3) biological sealing: carbon dioxide is supplied to plants such as algae and forests, and is consumed by photosynthesis of the plants. However, the above sealing method has the problems of remote transportation distance, low efficiency and small scale, and cannot meet the industrial large-scale sealing requirement under the current situation.
Disclosure of Invention
The invention mainly aims to provide a system and a method for sealing carbon dioxide based on a coal mine goaf, which aim to solve at least one technical problem.
In order to achieve the above object, the invention provides a system for sealing carbon dioxide based on a coal mine goaf, wherein the coal mine goaf is positioned in a caving zone goaf, a fracture zone and a bending sinking zone are sequentially formed above the caving zone goaf, and the system comprises:
a carbon dioxide temporary storage device;
The underground closed space is positioned on the falling zone and used for sealing and storing carbon dioxide, and is formed by surrounding a protective coal pillar, a well field boundary protective coal pillar and a closed roadway in the coal mine goaf;
The gas injection device comprises a gas injection pipeline communicated with the carbon dioxide temporary storage device, and the gas injection pipeline sequentially penetrates through the bending subsidence zone and the fracture zone and extends into the underground closed space;
At least one monitoring device includes a monitoring conduit extending through the bending dip zone and the fracture zone and into the underground enclosure.
In addition, the invention provides a method for sealing carbon dioxide based on a system for sealing carbon dioxide in a goaf of a coal mine, which comprises the following steps:
checking and creating a closed condition of a coal mine goaf;
Determining the positions of the gas injection hole and the monitoring hole;
according to the positions of the gas injection hole and the monitoring hole, a pipeline is drilled downwards from the surface above the underground closed space, and a carbon dioxide temporary storage device, a gas injection device and a monitoring device are installed and connected;
carbon dioxide is injected into the underground enclosed space.
In addition, the system for sealing carbon dioxide based on the coal mine goaf can also have the following additional technical characteristics.
According to one embodiment of the invention, the gas injection device further comprises a pressure sensor and a concentration sensor which are arranged in the gas injection pipeline, the monitoring device further comprises a pressure sensor and a concentration sensor which are arranged in the monitoring pipeline, and the system further comprises a controller connected with the pressure sensor and the concentration sensor and a remote monitoring device connected with the controller.
According to one embodiment of the invention, the device further comprises a power supply device arranged on the gas injection device and the monitoring device, and the power supply device is respectively connected with the pressure sensor and the concentration sensor.
According to one embodiment of the invention, at least two electric control safety valves are arranged in the gas injection pipeline; at least two non-return safety valves are arranged in the monitoring pipeline.
According to one embodiment of the invention, the gas injection pipe is in communication with a central region of the underground enclosure, and the monitoring pipe is in communication with a boundary region of the underground enclosure.
According to one embodiment of the present invention, after the step of installing and connecting the carbon dioxide temporary storage device, the gas injection device and the monitoring device, the method further comprises:
and cement mortar is poured between the outer wall of the gas injection pipeline and the rock stratum, so that the safety and reliability of the pipeline are enhanced.
According to one embodiment of the present invention, before the step of injecting carbon dioxide into the underground enclosure, further comprising:
Injecting air into the underground closed space until the underground closed space reaches a preset pressure value, monitoring the real-time pressure value of the underground closed space by a monitoring device, and determining whether the underground closed space meets the sealing condition according to the real-time pressure value and the preset pressure value.
According to one embodiment of the present invention, determining whether the underground enclosed space satisfies the sealing condition according to the magnitude of the real-time pressure value and the preset pressure value includes:
determining that the real-time pressure value is equal to a preset pressure value, and determining that the underground closed space meets the sealing condition; or (b)
Determining that the real-time pressure value is smaller than a preset pressure value, determining that the underground closed space does not meet the sealing condition, performing geological investigation work, searching and determining positions of faults and collapse columns conducted with the ground surface, and grouting and plugging the faults and the collapse columns.
According to one embodiment of the present invention, before the step of determining that the underground enclosed space meets the enclosed condition, the method further comprises: determining that the underground closed space area does not belong to the water resource enrichment area;
The step of determining that the underground enclosed space meets the enclosed condition comprises the following steps:
determining that the landing zone and the fracture zone are not conducted with the ground surface;
determining the positions of faults and collapse columns which are conducted with the ground surface, and grouting and plugging the faults and the collapse columns;
and reinforcing and sealing the closed roadway of the coal mine goaf.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a system and a method for sealing and storing carbon dioxide based on a coal mine goaf, which can economically, efficiently and massively seal and store a large amount of carbon dioxide, and can be extracted and utilized again when necessary, thereby realizing convenient sealing and storage and subsequent use of the carbon dioxide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing a goaf distribution of coal mine in one embodiment of the present invention;
FIG. 2 is a cross-sectional view of a subterranean enclosed space in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of a system for sequestering carbon dioxide based on a goaf of a coal mine in accordance with an embodiment of the present invention;
FIG. 4 is a graph showing the open pore distribution of a subterranean confined space in accordance with one embodiment of the present invention;
FIG. 5 is a schematic view of a gas injection apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a monitoring device according to an embodiment of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 6;
FIG. 8 is a schematic representation of a trap column plugging in accordance with one embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Systems and methods for sequestering carbon dioxide based on a goaf of a coal mine in accordance with some embodiments of the present invention are described below with reference to FIGS. 1-8.
As shown in fig. 1-6, an embodiment of the present invention provides a system for sealing carbon dioxide based on a goaf of a coal mine, wherein the goaf 10 of the coal mine is located at a caving zone 11, a fracture zone 12 and a bending subsidence zone 13 are sequentially formed above the caving zone 11, the system for sealing carbon dioxide based on the goaf of the coal mine comprises a carbon dioxide temporary storage device, at least one underground airtight space 14, a gas injection device 15 and at least one monitoring device 16, wherein the underground airtight space 14 is located at the caving zone 11 and is used for sealing carbon dioxide, the underground airtight space 14 is surrounded by a protective coal pillar 101, a well field boundary protective coal pillar 102 and an airtight roadway 103 in the goaf 10 of the coal mine, the gas injection device 15 comprises a gas injection pipeline 150 communicated with the carbon dioxide temporary storage device and is used for injecting carbon dioxide in the underground airtight space 14, the gas injection pipeline 150 sequentially penetrates through the bending subsidence zone 13 and the fracture zone 12 and extends into the underground airtight space 14, the monitoring device 16 is used for monitoring the concentration and pressure of carbon dioxide sealed in the underground airtight space 14, and the monitoring device 16 comprises a pipeline 160 extending through the bending subsidence zone 13 and into the underground airtight space 14.
Specifically, the carbon dioxide temporary storage device is arranged at a flat position around the gas injection hole, and mainly comprises a pneumatic pressure gas storage tank (or a pressure gas storage tank built by underground concrete). The temporary storage device stores carbon dioxide-rich tail gas (such as carbon dioxide-rich tail gas discharged during operation of industrial facilities such as thermal power plants, steel plants and coal chemical industry) discharged by various industries, preferably power plant flue gas, carbon dioxide tail gas discharged by a coal chemical industry device or mixed gas of the two, more preferably power plant flue gas, mixed gas of the power plant flue gas and carbon dioxide tail gas discharged by the coal chemical industry device, and most preferably power plant flue gas.
In one embodiment of the present invention, with continued reference to fig. 4, the middle region of the underground enclosed space 14 is provided with an air inlet hole 140, the two side edge regions of the underground enclosed space 14 are respectively provided with a through hole 141, the air injection pipeline 150 is communicated with the air inlet hole 140, and the monitoring pipeline 160 is communicated with the through hole 141.
It should be noted that, in a preferred embodiment, the at least one underground enclosed space 14 is a plurality of underground enclosed spaces, for example, 2-6 underground enclosed spaces, and the plurality of underground enclosed spaces can be filled with carbon dioxide simultaneously or alternately, so as to improve the treatment efficiency.
Further, in the present embodiment, with continued reference to fig. 5-7, the gas injection device 15 further includes a pressure sensor 151 and a concentration sensor 152 disposed in the gas injection pipeline 150, the monitoring device 16 further includes a pressure sensor 151 and a concentration sensor 152 disposed in the monitoring pipeline 160, and the system for sealing carbon dioxide based on the goaf of the coal mine further includes a controller connected to the gas injection pipeline 150, the pressure sensor 151 and the concentration sensor 152 in the monitoring pipeline 160, and a remote monitoring device connected to the controller. In particular, the remote monitoring device may be a server, cell phone, computer, or other monitoring device for monitoring the pressure and concentration values of carbon dioxide within the underground enclosure 14. The pressure sensor 151 and the concentration sensor 152 can acquire the pressure value and the concentration value of the carbon dioxide in the underground closed space 14, and transmit the pressure value and the concentration value of the carbon dioxide to the controller, and the controller transmits the pressure value and the concentration value of the carbon dioxide to the remote monitoring device, so that continuous monitoring and timing recording of the pressure value and the concentration value of the carbon dioxide are realized.
It should be noted that, with continued reference to fig. 5-7, the system for sealing carbon dioxide based on the goaf of the coal mine further includes a power supply device 17 disposed on the gas injection device 15 and the monitoring device 16, where the power supply device 17 is respectively connected with the gas injection pipeline 150, the pressure sensor 151, the concentration sensor 152 and the controller in the monitoring pipeline 160, so as to realize solar power supply.
It should be noted that the power supply device 17 may be solar energy, wind energy, or a power grid, and the present embodiment is not limited herein.
In addition, with continued reference to fig. 5-7, at least two electrically controlled safety valves 153 are disposed in the gas injection conduit 150 at positions corresponding to the bending subsidence zone 13 and the fracture zone 12, and at least two non-return safety valves 161 are disposed in the monitoring conduit 160 at positions corresponding to the bending subsidence zone 13 and the fracture zone 12. Specifically, in order to prevent the carbon dioxide sealed in the underground enclosed space 14 from overflowing and ensure the absolute safety of the sealed carbon dioxide, in this embodiment, two electrically controlled safety valves 153 and a check safety valve 161 are respectively provided in the gas injection pipeline 150 and the monitoring pipeline 160 to prevent the sealed carbon dioxide from being ejected. Meanwhile, in consideration of the stability of the rock stratum structure, the double-layer electric control safety valve 153 and the double-layer non-return safety valve 161 are respectively arranged on the bending subsidence belt 13 and the fracture belt 12, so that the sealing is ensured to be compact and reliable, the electric control safety valve 153 and the non-return safety valve 161 are respectively independent pipeline sections, are arranged in the gas injection pipeline 150 and the monitoring pipeline 160 before being drilled, and serve as part of the gas injection pipeline 150 and the monitoring pipeline 160 to enter the holes along with the pipelines.
It should be noted that, the installation positions of the electric control safety valve 153 and the non-return safety valve 161 in the present application are not limited to the positions corresponding to the bending sink zone 13 and the fracture zone 12, and the electric control safety valve 153 and the non-return safety valve 161 may be installed in the gas injection pipe 150 and the monitoring pipe 160. In this embodiment, a mounting bracket may be disposed in the gas injection pipe 150 and the monitoring pipe 160, and the mounting bracket may be used to fix the pressure sensor 151 and the concentration sensor 152, and fix the signal and the power supply cable connected to the pressure sensor 151 and the concentration sensor 152 along the inner walls of the gas injection pipe 150 and the monitoring pipe 160, where the pressure sensor 151 and the concentration sensor 152 are located in the areas of the gas injection pipe 150 and the monitoring pipe 160 corresponding to the fracture zone 12, and the pressure sensor 151 and the concentration sensor 152 are located below the electric control safety valve 153 or the non-return safety valve 161.
Next, the method for sealing carbon dioxide by using the system for sealing carbon dioxide in the goaf of the coal mine will be described in detail, and specifically includes the following steps:
s100, checking and creating a closed condition of a coal mine goaf;
firstly, determining that the caving zone 11 and the fracture zone 12 are not conductive to the ground surface; specifically, after the coal mining is finished, a caving zone 11, a fracture zone 12 and a bending sinking zone 13 (three zones for short) are formed, wherein the fracture zone 12 is a main factor for destroying the sealing condition of the underground closed space, and the non-conduction earth surface of the caving zone 11 and the fracture zone 12 is one of the conditions for influencing whether the underground closed space 14 is closed or not;
the calculation formula of the fracture zone range of the coal mine goaf is as follows: the maximum primary H Elevation of the mining site of the underground coal mine is 9m, and after the maximum primary H Elevation of the mining site is brought into the formula and a certain guarantee coefficient is reserved, the condition that the coal mine goaf with the depth of 100m is sealed is obtained through theoretical calculation. Most of coals in China are buried below 200 meters, so that a plurality of coals meeting the sealing condition can be seen.
Secondly, determining that the underground closed space 14 area does not belong to the water resource enrichment area; specifically, water resource enrichment areas such as river channels, lakes and the like exist at the upper parts of the goaf of the individual coal mines, and water inflow is large and continuous during coal production. The coal mine goaf is sealed and then is stored with a large amount of groundwater, which is not suitable for being used as a carbon dioxide sealing area and should be removed.
Further, determining the positions of faults and collapse columns 18 communicated with the ground surface, and grouting and plugging the faults and collapse columns 18; specifically, the fault and the collapse column 18 conducted with the earth surface will affect the closure of the underground closed space, in order to solve the problem, in this embodiment, geology is surveyed, geological structure information is obtained, the position of the fault and the collapse column 18 conducted with the earth surface is determined, and the grouting method is adopted to perform closure, so that complete closure is realized.
As shown in fig. 8, the plugging method of the fault and the collapse column 18 is the same, and in this embodiment, the plugging method of the collapse column 18 is described in detail as follows:
1. Preparing grouting materials, conveying the grouting materials by using a slurry vehicle 19, and uniformly stirring the grouting materials by taking 32.5 ordinary Portland cement as a main material, and adding a waterproof material and a pore sol agent according to a certain proportion;
2. at the bottom, middle and top of the collapse column 18, a worker Cheng Zuankong (pore size ) A grouting duct 20 is arranged;
3. Grouting is performed according to the sequence from bottom to top, so that the collapse column 18 is ensured to be sealed in multiple levels, and the safety factor is increased. The slurry on the slurry truck 19 was fed into the slurry-injecting conduit 20 by using the slurry-injecting pump station 21, and the slurry injection was stopped when the pressure of each slurry injection was controlled to 2MPa and exceeded, and the volume of the slurry injection was calculated to estimate the size of the closed space.
And finally, reinforcing and sealing the closed roadway 103 of the coal mine goaf. Specifically, although the closed roadway 103 is already sealed by masonry mortar, the closed roadway is a weak place, and reinforcement and sealing are performed again to ensure the closure of the underground closed space.
S200: determining the positions of the gas injection hole 22 and the monitoring hole 23; in this embodiment, the positions of the gas injection hole 22 and the monitoring hole 23 may be determined according to the existing production-verified geological plan in the coal mining process;
S300: according to the positions of the gas injection holes 22 and the monitoring holes 23, arranging pipelines from the surface of the upper part of the underground closed space 14 to the lower part, and installing and connecting a carbon dioxide temporary storage device, a gas injection device 15 and a monitoring device 16;
In this embodiment, in combination with the diameter of the gas injection pipe 150, the gas injection hole 22 may be selected to have a conventional bore diameter of 168mm, and the gas injection pipe 150 may be selected to have a 100mm pipe diameter alloy pipe to meet the gas injection amount and gas injection pressure requirements. Cement slurry is filled between the outer wall of the gas injection pipe 150 and the rock wall of the gas injection hole 22, so that the compaction and compression resistance of the pipeline are guaranteed, and the reliability and safety of the pipeline are enhanced.
Accordingly, in connection with the use of the monitor hole 23, the monitor hole 23 is selected to be 110mm in conventional drilling diameter, and the monitor tube 160 is selected to be 76mm in diameter alloy pipe so as to meet the monitoring and safety requirements. Cement slurry is filled between the outer wall of the monitoring pipe 160 and the monitoring hole 23, so that the compaction and compression resistance of the pipeline are guaranteed, and the reliability and safety of the pipeline are enhanced.
S400: performing a sealing test on the underground closed space 14;
Air is injected into the underground closed space 14 until the underground closed space 14 reaches a preset pressure value, such as 5MPa, the real-time pressure value of the underground closed space 14 is monitored by the monitoring device 16, the continuous test can be performed for 10 days, and whether the underground closed space 14 meets the sealing condition is determined according to the real-time pressure value and the preset pressure value. Specifically, when the real-time pressure value is equal to the preset pressure value, it can be determined that the underground closed space 14 meets the sealing condition, the test is qualified, the electric control safety valve 153 is opened to open and release gas;
correspondingly, when the real-time pressure value is smaller than the preset pressure value, the underground closed space 14 is determined to not meet the sealing condition, the leakage pressure release position is determined by geological investigation again, and grouting and plugging are carried out on the leakage pressure release position.
S500: carbon dioxide is injected into the underground enclosure 14.
In this example, according to the production process geological data, as shown in Table 1, the temperature of the underground enclosure 14 throughout the year is 5 ℃ (based on the measured data), in which case the pressure required for the carbon dioxide to become liquid is 3.96MPa. The pressure pump is utilized to continuously inject the carbon dioxide temporary storage device into the underground closed space 14 through the gas injection pipeline, and simultaneously, the pressure value of the underground closed space 14 is monitored in real time to reach 3.96MPa, namely, the underground closed space 14 is filled.
TABLE 1 comparison of liquid carbon dioxide temperature and pressure
| Temperature (temperature) | Pressure of |
| 10 | 4.50 |
| 9 | 4.39 |
| 8 | 4.28 |
| 7 | 4.18 |
| 6 | 4.07 |
| 5 | 3.96 |
| 4 | 3.87 |
| 3 | 3.77 |
| 2 | 3.67 |
| 1 | 3.58 |
| 0 | 3.48 |
| -1 | 3.39 |
| -2 | 3.30 |
| -3 | 3.22 |
| -4 | 3.13 |
| -5 | 3.05 |
| -6 | 2.96 |
| -7 | 2.88 |
| -8 | 2.80 |
| -9 | 2.72 |
| -10 | 2.65 |
S600: the pressure and concentration values of carbon dioxide within the underground enclosure 14 are continually monitored.
In this embodiment, the monitoring device 16 monitors the pressure value and the concentration value of the carbon dioxide in real time, and sends the collected pressure value and concentration value to the monitoring device at regular time, so as to realize real-time monitoring and timing count-up of the pressure value and the concentration value of the carbon dioxide.
When carbon dioxide is required to be extracted and utilized in the future, the electric control safety valve 153 is connected to slowly open the gas injection hole, and the carbon dioxide is connected to a carbon dioxide collecting tank on the ground surface, so that the extraction and utilization of the carbon dioxide can be realized.
The embodiments of the present disclosure are described above. These examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the disclosure, and such alternatives and modifications are intended to fall within the scope of the disclosure.
Claims (7)
1. The method for sealing carbon dioxide is characterized by adopting a system for sealing carbon dioxide based on a coal mine goaf, wherein the coal mine goaf is positioned on a caving zone, a fissure zone and a bending sinking zone are sequentially formed above the caving zone, the depth of the coal mine goaf is below 100m, and the system comprises: a carbon dioxide temporary storage device; the underground closed space is positioned on the falling zone and used for sealing and storing carbon dioxide, and is formed by surrounding a protective coal pillar, a well field boundary protective coal pillar and a closed roadway in the coal mine goaf; the gas injection device comprises a gas injection pipeline communicated with the carbon dioxide temporary storage device, and the gas injection pipeline sequentially penetrates through the bending subsidence zone and the fracture zone and extends into the underground closed space; at least one monitoring device comprising a monitoring conduit extending through the curved dip zone and the fracture zone and into the underground enclosure;
the method comprises the following steps:
checking and creating a closed condition of a coal mine goaf;
Determining the positions of the gas injection hole and the monitoring hole;
According to the positions of the gas injection holes and the monitoring holes, arranging pipelines from the surface above the underground closed space downwards, installing and connecting a carbon dioxide temporary storage device, a gas injection device and a monitoring device, injecting air into the underground closed space until the underground closed space reaches a preset pressure value, monitoring the real-time pressure value of the underground closed space by the monitoring device, and determining whether the underground closed space meets a sealing condition according to the real-time pressure value and the preset pressure value;
Determining that the real-time pressure value is equal to a preset pressure value, and determining that the underground closed space meets the sealing condition; or determining that the real-time pressure value is smaller than a preset pressure value, determining that the underground closed space does not meet the sealing condition, supplementing geological investigation, searching and determining the positions of faults and collapse columns conducted with the ground surface, and grouting and plugging the faults and the collapse columns, wherein the plugging methods of the faults and the collapse columns are the same;
The plugging method of the collapse column comprises the following steps: preparing grouting materials, conveying the grouting materials by using a slurry vehicle, and uniformly stirring the slurry by taking 32.5 ordinary Portland cement as a main material, and adding a waterproof material and a pore sol agent according to a certain proportion; drilling engineering drilling holes with the diameter phi of 42mm at the bottom, the middle and the top of the collapse column, and arranging grouting guide pipelines; respectively grouting according to the sequence from bottom to top to ensure multi-level sealing of the collapse column, conveying the slurry on the slurry car into a grouting guide pipe by using a grouting pump station, controlling the grouting pressure at 2MPa each time, stopping grouting when the grouting pressure exceeds the grouting pressure, calculating the grouting volume, and estimating the size of a sealing space;
carbon dioxide is injected into the underground enclosed space.
2. The method of sequestering carbon dioxide of claim 1, further comprising, prior to the step of installing and connecting the carbon dioxide temporary storage device, the gas injection device, and the monitoring device:
And (3) cement mortar is poured between the outer wall of the gas injection pipeline and the monitoring pipeline and the rock stratum.
3. The method of sequestering carbon dioxide of claim 1, further comprising, prior to the step of determining that the subterranean enclosed space meets the sequestration condition:
determining that the underground closed space area does not belong to the water resource enrichment area;
The step of determining that the underground enclosed space meets the enclosed condition comprises the following steps:
determining that the landing zone and the fracture zone are not conducted with the ground surface;
determining the positions of faults and collapse columns which are conducted with the ground surface, and grouting and plugging the faults and the collapse columns;
and reinforcing and sealing the closed roadway of the coal mine goaf.
4. The method of sequestering carbon dioxide of claim 1, wherein the gas injection device further comprises a pressure sensor and a concentration sensor disposed within the gas injection conduit, the monitoring device further comprises a pressure sensor and a concentration sensor disposed within the monitoring conduit, and the system further comprises a controller coupled to the pressure sensor and the concentration sensor and a remote monitoring device coupled to the controller.
5. The method of sequestering carbon dioxide of claim 4, further comprising providing power supply means on said gas injection means and monitoring means, said power supply means being connected to a pressure sensor and a concentration sensor, respectively.
6. The method of sequestering carbon dioxide of claim 4, wherein at least two electronically controlled safety valves are disposed in said gas injection conduit and at least two non-return safety valves are disposed in said monitoring conduit.
7. The method of sequestering carbon dioxide of claim 1, wherein said gas injection conduit communicates with a central region of said underground enclosure and said monitoring conduit communicates with a border region of said underground enclosure.
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| CN113914931B (en) * | 2021-09-30 | 2023-11-28 | 山东科技大学 | Method for goaf sealing and burning inhibition by gangue isolation belt in coal mining process |
| CN113931605B (en) * | 2021-11-05 | 2022-08-02 | 西安科技大学 | CO generated after coal deep underground gasification 2 Capturing and sealing method |
| CN115095387B (en) * | 2022-07-25 | 2023-04-25 | 中南大学 | Sealing and storing CO of underground return airway by using filling material 2 Is a method of (2) |
| CN115306479B (en) * | 2022-08-23 | 2023-06-09 | 中国矿业大学 | CO based on abandoned mine goaf 2 Block type sealing method |
| CN117365634B (en) * | 2023-11-21 | 2024-05-10 | 中国矿业大学 | Coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method |
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