CN117211863B - A method and structure for constructing a liquid CO2 storage reservoir based on artificial filling dam - Google Patents
A method and structure for constructing a liquid CO2 storage reservoir based on artificial filling dam Download PDFInfo
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Abstract
本发明涉及一种基于人工充填坝体构建液态CO2储存库的方法及构造，通过开掘运输巷和回风巷之间的支巷进行煤炭开采，开采完毕后间隔充填支巷，形成人工充填坝体，待人工充填坝体稳定后，对未充填区域进行防渗密封处理，之后注入液态CO2，构建用于存储液态CO2的储存库，创新提出了CO2储存及胶结充填控制地板沉陷的协同方法，不仅有效的控制了地表沉陷，而且是一种新型的液态CO2存储方法，也是在煤炭开发利用全过程自身实现碳中和新路径。
The present invention relates to a method and structure for constructing a liquid CO2 storage reservoir based on an artificial filling dam body. Coal mining is carried out by excavating a branch tunnel between a transport tunnel and a return air tunnel. After the mining is completed, the branch tunnel is filled at intervals to form an artificial filling dam body. After the artificial filling dam body is stable, the unfilled area is sealed for anti-seepage treatment, and then liquid CO2 is injected to construct a storage reservoir for storing liquid CO2 . An innovative synergistic method of CO2 storage and cementation filling to control floor subsidence is proposed, which not only effectively controls surface subsidence, but also is a new liquid CO2 storage method, and also a new path to achieve carbon neutrality in the entire process of coal development and utilization.
Description
Technical Field
The invention relates to a method and a structure for constructing a liquid CO 2 reservoir based on a manual filling dam body, and belongs to a collaborative method for controlling surface subsidence and storing liquid CO 2 in filling exploitation.
Background
The energy source in China still takes coal as a main material, CO 2 generated in the coal industry takes the main role in the total emission of the whole country, and the carbon emission is a problem to be solved urgently.
In order to solve the above problems, development of clean energy and improvement of energy utilization rate are important, and utilization and disposal of CO 2 are also very important parts. Most of coal mining in China is underground mining, goafs formed by coal mining provide sufficient space for CO 2 disposal, and green coal mining and reasonable disposal of CO 2 are important in the background. There is a need for a liquid CO 2 reservoir for manual filling of a dam.
Disclosure of Invention
The invention provides a method and a structure for constructing a liquid CO 2 storage warehouse based on an artificial filling dam body, which take a coal extraction space as the space of the storage warehouse, fully utilize underground coal extraction space and realize large-scale liquid CO 2 sealing.
The technical scheme adopted for solving the technical problems is as follows:
A method for constructing a liquid CO 2 storage warehouse based on a manual filling dam body specifically comprises the following steps:
Step S1, mining coal in a branch roadway between a transportation roadway and a return roadway based on a longwall roadway-by-roadway cementing filling coal mining method, and performing interval stoping on the coal in the branch roadway;
S2, after the step S1 is completed in the stoping of the branch roadway, blocking two end parts of the goaf branch roadway through a retaining wall of a filling dam body, performing cemented filling operation on a blocking part, and filling cemented filling materials into the blocking part through a slurry conveying pipeline to form an artificial filling dam body;
s3, after the artificial filling dam body is stable, stoping branch roadways which are not adopted at the two sides of the artificial filling dam body to form a plurality of cavities for constructing a storage warehouse;
Step S4, paving a filling pipeline for constructing a reservoir to a plurality of cavities positioned in a downhole branch roadway, embedding an impermeable material storage tank in each cavity, accessing a liquid CO 2 liquid inlet pipe communicated with the filling pipeline, installing an impermeable material mixed triggering device in the impermeable material storage tank, and starting the impermeable material mixed triggering device when the impermeable material mixed triggering device detects that CO 2 is filled into the impermeable material storage tank, so as to perform impermeable treatment on the branch roadway;
S5, plugging two end parts of each storage warehouse through a storage warehouse retaining wall respectively, and forming a plurality of cavities for constructing the storage warehouse into a closed space;
As a further preferred aspect of the present invention, the supporting strength of the retaining wall of the storage is greater than 7Mpa;
As a further preferred aspect of the present invention, the reservoir retaining wall is made of single hydraulic struts or retaining wall back plates or sealing cloths;
as a further preferred aspect of the present invention, in step S2, the width of the branch roadway to be mined is the same as the width of the section of the constructed storage warehouse;
As a further preferable mode of the invention, the step S2-step S3 is that between the transportation lane and the return air lane, the artificial filling dam body and the storage warehouse are sequentially arranged at intervals, and the spacing of the branch lanes, the spacing of the formed artificial filling dam body and the spacing of the storage warehouse are integer multiples of the section width of the branch lane;
According to the method structure for constructing the liquid CO 2 storage warehouse based on the artificial filling dam, an overburden stratum, a basic roof, a direct roof, a branch roadway and a bottom plate are sequentially included from the ground surface in the vertical direction, the artificial filling dam and a storage warehouse are sequentially arranged in the branch roadway at intervals, two ends of the artificial filling dam parallel to a section are respectively plugged through a filling dam retaining wall, and two ends of the storage warehouse parallel to the section are respectively plugged through a storage warehouse retaining wall;
as a further preferred aspect of the invention, the included angle between the slurry conveying pipeline and the filling dam body retaining wall or the storage warehouse retaining wall is 50-60 degrees.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. According to the method for constructing the liquid CO 2 storage warehouse based on the artificial filling dam body, the liquid CO 2 storage warehouse is established in the branch roadway, so that the ground subsidence after coal mining is prevented, the large-scale treatment of CO 2 solid waste is also established, and a synergistic technical approach of green coal resource mining is realized;
2. According to the method for constructing the liquid CO 2 storage warehouse based on the artificial filling dam, in the formed structure, the storage warehouse and the artificial filling dam are formed by the space extracted by coal, so that the recycling of the structure is realized to the greatest extent, and the design method is simple and feasible and has higher economical efficiency and practicability.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a plan view of the arrangement of a repository in a preferred embodiment provided by the present invention;
FIG. 2 is a cross-sectional view of a constructional arrangement formed in a preferred embodiment provided by the present invention;
FIG. 3 is a workflow diagram of a method of constructing a liquid CO 2 reservoir based on artificial filling of a dam provided by the present invention;
FIG. 4 is a schematic illustration of the structural formation of a reservoir provided by the present invention;
FIG. 5 is a schematic view of the formation of the present invention;
FIG. 6 is a graph of a numerical simulation of basic parameters of a repository provided by the present invention.
In the figure, 1 is an artificial filling dam body, 2 is a storage warehouse, 3 is a storage warehouse retaining wall, and 4 is a filling dam body retaining wall.
Detailed Description
The application will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present application. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present application.
As explained in the background art, based on the current situation that energy resources in China are mainly coal, a goaf formed after coal mining provides a space for CO 2 disposal, so that the application provides a method for constructing a liquid CO 2 reservoir based on an artificial filling dam body, which not only prevents surface subsidence after coal mining, but also establishes large-scale disposal of CO 2 solid wastes.
The construction related to the method provided by the application mainly comprises two parts, wherein one part is a manual filling dam body, and the other part is a storage warehouse. And (3) coal mining is carried out through a branch roadway between the driving transportation roadway and the return air roadway, the branch roadway is filled at intervals after mining is finished, an artificial filling dam body is formed, after the artificial filling dam body is stable, anti-seepage sealing treatment is carried out on an unfilled region, then liquid CO 2 is injected, a storage warehouse is constructed, and a synergistic method for storing CO 2 and controlling floor subsidence through cemented filling is innovatively provided.
As shown in fig. 3-4, the method specifically comprises the following steps:
And S1, mining coal in a branch roadway between a transportation roadway and a return roadway based on a longwall roadway-by-roadway cemented filling coal mining method, and performing interval stoping on the coal in the branch roadway. The longwall lane-by-lane cemented filling coal mining method is based on the mode of cyclic mining, and the arrangement mode of the working face formed by the technology meets the condition of constructing a storage warehouse.
And S2, after the step S1 is completed in the stoping of the branch roadway, blocking two end parts of the goaf branch roadway through a filling dam body retaining wall 4, performing cemented filling operation on the blocking part, and filling cemented filling materials into the blocking part through a slurry conveying pipeline to form the artificial filling dam body 1. Unlike other methods, this is to control the roof strata with a filler formed from a cemented filling material after the coal resource is mined, which is a manual filling dam of the CO 2 reservoir. The function of the filling body is an innovation point, not only solid waste resources are treated, but also the overburden layer after coal is extracted is protected from collapsing, and meanwhile, the manual filling dam body of the storage warehouse 2 is considered. The front process for forming the artificial filling dam body is a long-wall lane-by-lane cemented filling coal mining method, namely the artificial filling dam body is formed by filling bodies, dam retaining walls and sealing cloth.
And S3, after the artificial filling dam body is stable, stoping branch roadways which are not mined at the two sides of the artificial filling dam body to form a plurality of cavities for constructing a storage warehouse.
And S4, paving a filling pipeline for constructing a reservoir to a plurality of cavities positioned in the underground branch roadway, embedding an impermeable material storage tank in each cavity, accessing a liquid CO 2 liquid inlet pipe communicated with the filling pipeline, installing an impermeable material mixing trigger device in the impermeable material storage tank, and starting the impermeable material mixing trigger device when the impermeable material mixing trigger device detects that CO 2 is filled into the impermeable material storage tank, so as to perform impermeable treatment on the branch roadway.
And S5, respectively plugging two ends of each storage warehouse through a storage warehouse retaining wall 3, and forming a plurality of cavities for constructing the storage warehouse into a closed space, wherein the supporting strength of the storage warehouse retaining wall is more than 7MPa, because the storage warehouse retaining wall needs to stably support the internal pressure, and meanwhile, the sealing performance of the storage warehouse retaining wall is considered, and the storage warehouse retaining wall is manufactured by adopting a single hydraulic prop or retaining wall backboard or sealing cloth. CO 2 is filled into the storage warehouse through a filling pipeline, and the anti-seepage material mixing triggering device is continuously started to perform anti-seepage treatment on the branch roadway. Finally, the storage warehouse is formed, compared with the prior art, firstly, the underground coal extraction space is utilized, secondly, the direct roof can be supported, large deformation and the like are prevented, and secondly, the large-scale liquid CO 2 can be stored in a sealing mode.
Comprehensively considering the subsidence requirement of the coal mine surface and the lateral pressure of the liquid CO 2 storage warehouse on the artificial filling dam body, researching and determining the roadway digging distance, the roadway digging width, the stoping distance, the interval filling distance and the cross section size of the CO 2 storage warehouse of the long-wall roadway-by-roadway working surface through a numerical simulation and theoretical analysis method, wherein in the step S2, the roadway supporting width to be mined is the same as the cross section width of the constructed storage warehouse. And the distance between the branch drifts, the distance between the formed artificial filling dam bodies and the distance between the storage reservoirs are integer multiples of the section width of the branch drifts.
The structure formed by the method for constructing the liquid CO 2 storage warehouse based on the artificial filling dam body sequentially comprises an overburden layer, a basic roof, a direct roof, a branch roadway and a bottom plate from the ground surface, wherein the artificial filling dam body and the storage warehouse are sequentially arranged in the branch roadway at intervals, two end parts of the artificial filling dam body, which are parallel to a section, are respectively plugged through a filling dam body retaining wall, and two end parts of the storage warehouse, which are parallel to the section, are respectively plugged through a storage warehouse retaining wall.
After the whole structure is formed, as the filling and coal conveying routes are involved in construction, the application also provides a schematic diagram (figure 5), wherein one is the coal conveying route and the other is the filling route, the cementing filling material for implementing cementing filling operation is filled into the empty branch roadway through the slurry conveying pipeline in the filling route to form the artificial filling dam body, and the included angle between the slurry conveying pipeline and the filling dam body retaining wall or the storage warehouse retaining wall is set to be 50-60 degrees according to the test result, so that the filling efficiency is ensured by limiting the included angle.
Examples:
In order to verify the feasibility of the method provided by the application, taking a certain coal mine as an example, the mine design production capacity of a mine area is 2.4Mt/a, the main coal seam is two 2 coal seams at present, the first coal seam is designed to be a CT2101 working surface, the working surface propulsion length is 372m, the surface length is 113m, the burial depth is 650m, the average thickness of the coal seam is 2.95m, the mining is carried out by adopting a longwall lane-by-lane cemented filling coal mining method, and the mine is required to effectively control the surface subsidence.
(1) And determining the strength of the artificial filling dam body required by the working surface to control the surface subsidence through numerical simulation and theoretical analysis, and finally determining that the strength of the artificial filling dam body is larger than 5.216MPa.
(2) Based on the strength of the cemented filling body required by controlling the subsidence of the earth surface, laboratory experiments are carried out in combination with the treatment requirements of mine waste to further determine the composition and the proportion of the cemented filling material for implementing the cemented filling operation, and finally, the filling proportion is determined to be 80 percent of gangue, 7.5 percent of fly ash and 12.5 percent of cement.
(3) The working face to be exploited by adopting the long-wall roadway-by-roadway is simulated and studied by combining a numerical simulation method with the actual geological engineering condition of a certain coal mine, and as shown in fig. 1-2, the width of the drivage roadway of the filling roadway is finally determined to be 5.4m, the roadway spacing is 16.2m, the spacing between manual filling dams after exploitation is 5.4m, and the section of the drivage roadway of the storage is 5.4m×2.95m.
(4) After the long-wall lane-by-lane working face of the CT2101 is mined at intervals, the branch lanes are cemented and filled by arranging filling pipelines and filling dam retaining walls, so that the artificial filling dam is formed, and the artificial filling dam is shown in figure 1.
(5) And after the artificial filling dam body is stable, stoping the branch roadways which are not mined at the two sides of the artificial filling dam body, and paving filling pipelines of the CO 2 storage station to underground branch roadways. The liquid CO 2 liquid inlet pipe, the impermeable material storage tank, the impermeable material mixing triggering device and the like are arranged in the storage warehouse, and when CO 2 is detected to be filled, the impermeable material mixing device is triggered to perform impermeable treatment on the branch roadway;
(6) And blocking two ends of each storage warehouse by using storage warehouse retaining walls respectively to form a closed space, wherein the pressure of the storage warehouse is 7Mpa. The storage retaining wall adopts single hydraulic support, retaining wall backplate, sealing cloth etc., and single support cooperation backplate is used for the stability of storage retaining wall. And finally filling CO 2, and constructing a liquid CO 2 storage warehouse to store the liquid CO 2 shown in FIG. 6.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present application means that each exists alone or both exist.
"Connected" as used herein means either a direct connection between components or an indirect connection between components via other components.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
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| CN113958365A (en) * | 2021-10-07 | 2022-01-21 | 西安弗尔绿创矿业科技有限责任公司 | Short and long wall discontinuous filling mining cooperated with basic group solid waste CO2Sealing system and method |
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