WO2023272587A1 - 一种实现co2地下封存的煤炭流态化开采方法 - Google Patents
一种实现co2地下封存的煤炭流态化开采方法 Download PDFInfo
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- WO2023272587A1 WO2023272587A1 PCT/CN2021/103578 CN2021103578W WO2023272587A1 WO 2023272587 A1 WO2023272587 A1 WO 2023272587A1 CN 2021103578 W CN2021103578 W CN 2021103578W WO 2023272587 A1 WO2023272587 A1 WO 2023272587A1
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- 238000005065 mining Methods 0.000 title claims abstract description 306
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000003860 storage Methods 0.000 title abstract description 15
- 230000008093 supporting effect Effects 0.000 claims abstract description 31
- 239000011435 rock Substances 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 14
- 238000011065 in-situ storage Methods 0.000 claims abstract description 11
- 238000010248 power generation Methods 0.000 claims abstract description 11
- 238000009412 basement excavation Methods 0.000 claims description 50
- 230000009919 sequestration Effects 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 21
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000002912 waste gas Substances 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000004146 energy storage Methods 0.000 claims description 8
- 230000032258 transport Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- 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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- 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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Definitions
- the invention relates to the technical field of mining of mineral resources, in particular to a coal fluidized mining method for realizing CO2 underground sequestration.
- the coal in-situ fluidized mining technology is different from the traditional solid energy mining method, and realizes the underground unmanned and intelligent mining of energy.
- the present invention provides a coal fluidized mining method for realizing CO 2 underground sequestration, so as to realize CO 2 underground sequestration.
- the present invention provides the following technical solutions:
- a coal fluidized mining method for realizing CO Underground sequestration comprising the steps of:
- an energy transmission pipeline for delivering energy to the mining equipment and at the same time capable of transporting the electric energy obtained by the mining equipment through coal conversion to the ground;
- the mining equipment carries out full-section excavation and mining along the mining strip, and the mining equipment transmits the converted electric energy to the ground through the energy transmission pipeline, and at the same time, the main shaft transports the electric energy to the mining equipment.
- the mining equipment fills and supports at least one of the two adjacent mining strips in the goaf located at the rear end of the mining equipment to form filling Supporting walls, a space for sealing the CO 2 and waste gas emitted by the mining equipment during the power generation process and artificially injected CO 2 is formed between adjacent filling and supporting walls, and the filling and supporting walls can absorb the CO2 gas;
- the material used for filling and supporting in the step 4) includes coarse aggregate, mixing material, quick-setting agent, calcium carbonate and the described
- the gangue sorted out by the mining equipment, the coarse aggregate, mixing material, quick-setting agent and calcium carbonate are transported to the filling and supporting bin of the mining equipment through the main shaft, the coarse aggregate, the mixing The aggregate, the quick-setting agent, the calcium carbonate and the gangue are stirred in the filling support bin, and pumped to the filling position through the delivery pipeline of the filling support bin.
- the step 4) is specifically:
- the mining equipment mines in layers from bottom to top in the coal seam.
- the mining equipment transmits the converted electric energy to the ground through the energy transmission pipeline.
- the mining equipment fills and supports all the mining strips of the lower and middle layers of the coal seam at the goaf at the rear end of the mining equipment,
- the mining equipment fills and supports at least one of the two adjacent mining strips on the upper layer of the coal seam in the goaf located at the rear end of the mining equipment to form a filling support wall, and the adjacent filling support wall A space is formed between the CO 2 and waste gas discharged in situ during the power generation process of the mining equipment and the artificially injected CO 2 , and the filling support wall can absorb the CO 2 gas.
- step 7 after the step 6), the mining equipment seals the main well.
- the mining equipment includes a first mining bin, a first sorting bin, a first conversion bin, a first energy storage bin, The support bin, the second energy storage bin, the second conversion bin, the second sorting bin and the second mining bin are filled, and the mining equipment can be excavated along the mining direction of the first mining bin or the second mining bin.
- the shield cutter head of the first mining bin of the mining equipment is closed, and all the shield cutter heads of the second mining bin on the other side of the mining equipment are opened. the shield cutter head and adjust the tunneling direction of the shield cutter head, and carry out tunneling and mining on the adjacent mining strips to be tunneled;
- step 8 after all the mining strips in the mining area have been mined and filled, set the main mining area in the mining area.
- the position of the well is provided with an impermeable wall.
- the coal fluidized mining method for realizing CO underground sequestration includes mining area division, tunneling and mining, filling support, roof and floor sealing, and boundary surrounding rock sealing.
- the filling and supporting can form a high-strength supporting wall, which not only has an effective supporting effect on the roof and floor rock, but also forms a filling structure.
- Support walls, adjacent filling support walls form an underground space for CO2 storage, and the mining equipment also seals the roof and floor of the goaf, and seals the boundary surrounding rock of the mine field, so that the entire mine field can be recovered after mining is completed.
- a closed space for underground storage of CO2 is formed, and the waste gas such as CO2 generated during the power generation process of mining equipment is directly discharged in situ, and stored in the above space, so as to realize the underground storage of CO2 and ensure that the polluted gas emitted by mining equipment does not go out of the ground , to reduce the harm of carbon emissions to the environment.
- Fig. 1 is the structural schematic diagram of the mine field division that the embodiment of the present invention provides
- Fig. 2 is a schematic structural view of the mining equipment provided by the embodiment of the present invention.
- Fig. 3 is a structural schematic diagram of the filling support provided by the embodiment of the present invention.
- Fig. 4 is the structural representation of the strip filling support of a certain mining area provided by the first embodiment of the present invention
- Fig. 5 is the structural representation of the strip filling support of a certain mining area provided by the second embodiment of the present invention.
- Fig. 6 is the structural representation of the strip filling support of a certain mining area provided by the third embodiment of the present invention.
- Fig. 7 is a structural schematic diagram of the strip filling support of a certain mining area provided by the fourth embodiment of the present invention.
- Fig. 8 is a structural schematic diagram of filling support when the thickness of the coal seam exceeds the excavation section of the mining equipment provided by the embodiment of the present invention
- Fig. 9 is the flow chart of the coal fluidized mining method that realizes CO underground sequestration provided by the first embodiment of the present invention.
- Fig. 10 is a flowchart of a coal fluidized mining method for realizing CO 2 underground sequestration provided by the second embodiment of the present invention.
- Mining area 1. Mining area, 2. Mining strip, 3. Main well, 4. Energy transmission pipeline, 5. Mining equipment, 51. First mining bin, 52. First sorting bin, 53. First conversion bin, 54 , the first energy storage bin, 55, the second energy storage bin, 56, the second conversion bin, 57, the second sorting bin, 58, the second mining bin, 59, the filling support bin, 6, the filling support wall .
- the invention discloses a coal fluidized mining method for realizing CO2 underground sequestration, so as to realize CO2 underground sequestration.
- the invention discloses a coal fluidized mining method for realizing CO underground sequestration, comprising the following steps:
- An energy transmission pipeline is set on each mining strip for delivering energy to the mining equipment and at the same time can transmit the electric energy obtained by the mining equipment using coal conversion to the ground;
- the excavation equipment carries out full-section excavation and mining along the excavation strip.
- the excavation equipment transmits the converted electric energy to the ground through the energy transmission pipeline.
- the main shaft transports the materials for filling and support to the excavation equipment.
- the mined-out area at the back end of the equipment is filled and supported to form a filling and supporting wall, and the mining equipment 5 is used to fill and support at least one of the two adjacent mining strips 2, and a wall is formed between adjacent filling and supporting walls to seal the excavation.
- Equipment 5 is a space for in-situ emission of CO 2 and waste gas and artificially injected CO 2 during the power generation process.
- the mining strips 2 in each mining area 1 are filled and supported at intervals. Specifically, one of the two adjacent mining strips can be filled. Filling support can also be carried out at intervals of two excavation strips, or at intervals of three or more excavation strips.
- the interval filling support can be equal intervals of filling support, or it can be Filling support with unequal intervals, the final result is that not all mining strips in a certain mining area are filled and supported, and at least one mining strip in a certain mining area is not filled and supported, and it can be used in the mining area.
- a space is formed for storing the CO2 and waste gas discharged in situ during the power generation process of the mining equipment 5, as well as the artificially injected CO2 space, and the specific location of the filling support is determined according to the mining conditions of different sites;
- Step 1) is the step of dividing the well field, and the division of the well field can facilitate mining equipment to excavate and mine in the well field.
- the minefield is divided into at least one quadrangular mining area, the long side of the quadrangular mining area extends along the direction of the coal seam, and the short side of the quadrangular mining area extends along the direction of the coal seam.
- Mine field division also includes dividing each mining area, dividing each mining area into a plurality of mining strips with equal width, and the multiple mining strips are parallel to the broad side of the mining area and distributed along the length direction of the mining area.
- the appropriate mining equipment is selected according to the size of the mining strip in the mining area, and the section size of the mining equipment is approximately the same as the size of the mining strip.
- the main well is drilled, and the main well extends to the well field.
- the main well is used to transport the mining equipment, and to transport the materials used for filling support and sealing of the roof, floor and boundary surrounding rock to the mining equipment during the mining process.
- the number of main wells in this scheme is two, and the two main wells are set on the boundary of the well field and are respectively set at two diagonal positions of the well field.
- the well field is divided into two quadrangular mining areas, and the two quadrangular mining areas form a large quadrangular well field, and the two main wells are respectively set at two diagonal positions of the large quadrilateral well field.
- One of the main wells in the two main wells is used as the starting point of tunneling mining, and the other main shaft is used as the end point of tunneling mining.
- Each mining strip is provided with an energy transmission pipeline, and the energy transmission pipeline is used to transmit energy to the mining equipment and at the same time can transmit the electric energy converted by the mining equipment to the ground.
- step 4 the excavation equipment performs full-face excavation along the length extension direction of the excavation strip, and the excavation equipment transmits the converted electric energy to the ground through the energy transmission pipeline.
- the material used for filling and supporting in this scheme is a material capable of adsorbing CO 2 gas, which has high strength after solidification and can absorb CO 2 gas.
- the filling support is described here.
- the filling support is supported along the length direction of the mining strip.
- the filling support can be a section-by-section structure along the length extension direction of the mining strip, or it can be filled with the entire mining strip. However, at least one of the two adjacent excavation strips is filled and supported, and the other can be filled and supported, or not. However, there must be excavation after the excavation of the entire mining area is completed.
- the last mining strip is not filled and supported, and the space of the goafed mining strip that is not filled and supported can be used to store the CO2 and waste gas emitted in situ during the power generation process of the mining equipment 5 and the artificially injected CO2 . space.
- each section of filling support forms a filling support wall, and the adjacent filling support walls It includes not only adjacent filling and supporting structures located in the same mining strip, but also adjacent filling and supporting structures along the direction perpendicular to the length of the mining strip.
- the filling and supporting structures in the mining area The support structure forms a maze-like structure.
- the adjacent filling support walls are located close to two along the direction perpendicular to the length of the excavation strip. Fill support structure.
- the space between adjacent filling retaining walls 6 forms a space for sequestering the CO 2 and waste gas discharged in situ during the power generation process of the mining equipment, as well as the artificially injected CO 2 , and the filling retaining walls 6 can also adsorb CO 2 .
- the coal fluidized mining method for realizing CO 2 underground sequestration disclosed in this proposal includes mining area division, tunneling mining, filling support, roof and bottom plate sealing, and boundary surrounding rock sealing. In this scheme, filling and supporting is carried out on the goaf formed by excavation equipment along the mining strip.
- the filling and supporting can form a high-strength supporting wall, which not only has an effective supporting effect on the roof and floor rock, but also forms a
- the continuous filling retaining walls 6 parallel to the excavation strips form a space for underground storage of CO2 between adjacent filling retaining walls 6.
- the mining equipment also seals the roof and floor of the goaf, and the boundary of the mine field is sealed.
- the surrounding rock is sealed, so that the entire well field forms a closed space for storing CO 2 underground after the mining is completed.
- the waste gas such as CO 2 generated during the power generation process of mining equipment is directly discharged in situ and the artificially injected CO 2 is sealed in the above space. , realize the underground storage of CO2, ensure that the polluted gas emitted by mining equipment does not leave the ground, and reduce the harm of carbon emissions to the environment.
- Step 5) is used to realize the sealing of the roof and the bottom plate
- step 6) is used to realize the sealing of the boundary surrounding rock, so that the entire mining area forms a closed space.
- the sealing of the roof and floor of the excavation strip with filling and retaining walls is carried out during the support and filling process of the excavation strip.
- Separate sealing measures; the sealing of the roof and floor of the mining strip without filling retaining walls is the sealing of the roof and floor of the goaf located at the back end of the mining equipment during the mining process by the mining equipment.
- the sealing of the boundary surrounding rock is also carried out during the excavation process of the mining strip. As long as the boundary surrounding rock is encountered during the mining process, the sealing measures for the boundary surrounding rock mining area will be taken to reduce CO2 gas overflowing the mining area through the boundary surrounding rock. amount.
- Steps 4), 5) and 6) in this scheme are not a limitation to the order of operation steps, and the order of steps 4), 5) and 6) can be adjusted according to actual needs, so that the mining area forms a storage area for underground CO 2 space.
- the sealing system of the mining equipment is used to spray or install the anti-permeability sealing material transported from the ground into the mining bin to the surface of the overlying stratum, floor and surrounding rock of the goaf , and ensure that the plugging material can closely adhere to the surface of the overlying rock strata, floor and surrounding rock, improve the permeability of the roof and floor of the goaf, and ensure that CO 2 gas will not flow along the upper surface when CO 2 is sequestered later. Leakage and filtration occurred in overlying strata, floor and surrounding rock.
- the materials for filling and supporting in step 4) include coarse aggregate, mixing material, quick-setting agent, calcium carbonate and gangue sorted out by the mining equipment.
- Coarse aggregate, mixing material, quick-setting agent and calcium carbonate are transported from the ground to the filling support bin of the mining equipment through the main shaft, and are fully mixed with the gangue sorted out by the sorting bin of the mining equipment to prepare a quick-setting Condensed and high-strength filling slurry.
- the material has high initial setting strength, and contains calcium sources such as calcium carbonate, which can chemically react with CO2 after solidification, and absorb CO2 gas in the mining area.
- the filling slurry is quickly pumped to the filling position through the transportation pipeline of the filling support bin for unloading and compaction.
- a high-strength support wall will be formed, which can not only effectively support the roof and bottom plate, but also effectively absorb CO. 2 and other exhaust gas.
- the transportation distance of the filling slurry is greatly shortened. Therefore, the selection of quick-setting filling slurry will not cause the problem of blocked pipes and difficult transportation, and can ensure that the filling slurry can be Quickly solidify to reach the support strength, and achieve the purpose of filling with mining.
- Filling and supporting at intervals in mining strips can also improve the economic benefits in the mining process and provide more sufficient underground space for CO 2 storage.
- the specific filling support scheme is determined according to the stress conditions of the surrounding rock. It is necessary to ensure that the strength and spacing of the filling support can meet the requirements of roof control and ensure that the key layer does not fracture and sink. In this scheme, the filling support operation and coal seam excavation are carried out at the same time.
- the strip mining scheme is still adopted, and the division of the mining strips is in accordance with the division structure in step 1), but the interval mining strips are no longer implemented between adjacent mining strips Instead, all mining strips are filled and supported to ensure that the entire goaf is filled with filling and supporting materials, and the goaf is completely filled and supported.
- the above method is still adopted.
- the space filling support scheme described in the article is used for support.
- the fluidized coal mining method for CO 2 underground sequestration disclosed in this solution also includes step 7) closing the main well 3 after step 6), so that the entire mining area forms a closed space.
- the mining equipment disclosed in this solution includes a first mining bin 51, a first sorting bin 52, a first conversion bin 53, a first energy storage bin 54, a filling support bin 59, a second energy storage bin 55,
- the second conversion bin 56, the second sorting bin 57, and the second mining bin 58 cooperate with each other based on systematic and intelligent control, and work together to realize a coal mining and utilization mode that integrates resource mining, conversion and utilization, and filling and support.
- Coal mining operations are mainly carried out by the first mining bin and the second mining bin, using the shield mining method to complete the mining of the full-section coal seam.
- the mining equipment is arranged in a symmetrical structure, and the first mining chamber and the second mining chamber are set.
- step 4 when the excavation equipment 5 carries out full-face excavation and mining along the excavation strip 2, it is specifically:
- the front end of the shield cutter head can be equipped with auxiliary rock-breaking devices such as microwave radiation or water jets.
- auxiliary rock-breaking devices such as microwave radiation or water jets.
- the coal fluidized mining method for CO2 underground sequestration disclosed in this program also includes step 8) After all the mining strips in the mining area have been mined and filled, an anti-seepage wall is set at the position where the main shaft is set in the mining area , so that the mining area forms a confined space.
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Abstract
Description
Claims (7)
- 一种实现CO 2地下封存的煤炭流态化开采方法,其特征在于,包括步骤:1)划分井田为至少一个采区(1),并将所述采区(1)划分为多个宽度相等的采掘条带(2);2)钻设延伸至所述井田的主井(3),并通过所述主井(3)安装采掘设备(5);3)在每个所述采掘条带(2)上设置用于向采掘设备(5)输送能源同时能够将所述采掘设备(5)利用煤炭转化得到的电能输送至地面的输能管线(4);4)所述采掘设备(5)沿所述采掘条带(2)进行全断面掘进开采,所述采掘设备(5)通过所述输能管线(4)将转化生产的电能输送至地面,同时所述主井(3)向所述采掘设备(5)内输送用于充填支护以及密封顶板、底板和边界围岩的物料,所述采掘设备(5)对相邻两条所述采掘条带中的至少一条位于所述采掘设备后端的采空区进行充填支护形成支护墙,相邻充填支护墙之间形成用于封存所述采掘设备在发电过程中原位排放的CO 2和废气以及人工注入的CO 2的空间,所述充填支护墙能够吸附所述CO 2气体;5)对所述采掘设备(5)后端的采空区的顶板和底板采取封堵措施;6)对所述井田的边界围岩采取封堵措施。
- 根据权利要求1所述的实现CO 2地下封存的煤炭流态化开采方法,其特征在于,所述步骤4)中用于充填支护的物料包括粗骨料、拌合料、速凝剂、 碳酸钙和所述采掘设备(5)分选出的矸石,所述粗骨料、拌合料、速凝剂和碳酸钙通过所述主井(3)输送至所述采掘设备(5)的充填支护仓,所述粗骨料、所述拌合料、所述速凝剂、所述碳酸钙和所述矸石在所述充填支护仓内搅拌,并通过所述充填支护仓的输送管路泵送至充填位置。
- 根据权利要求1所述的实现CO 2地下封存的煤炭流态化开采方法,其特征在于,在所述采掘条带(2)煤层厚度大于所述采掘设备(5)的掘进断面时,所述步骤4)具体为:所述采掘设备(5)在所述煤层内自下而上分层进行开采,所述采掘设备(5)通过所述输能管线(4)将转化生产的电源输送至地面,所述采掘设备(5)在依次在所述煤层的下层、中层和上层按照所述步骤1)中划分的所述采掘条带(2)进行全断面掘进开采,同时所述采掘设备(5)对所述煤层的下层和中层的所有采掘条带(2)位于所述采掘设备后端的采空区进行充填支护,所述采掘设备对所述煤层的上层的相邻两条所述采掘条带(2)中的至少一条位于所述采掘设备后端的采空区进行充填支护形成充填支护墙,相邻充填支护墙之间形成用于封存所述采掘设备在发电过程中原位排放的CO 2和废气以及人工注入的CO 2的空间,所述充填支护墙能够吸附所述CO 2气体。
- 根据权利要求1所述的实现CO 2地下封存的煤炭流态化开采方法,其特征在于,还包括位于所述步骤6)之后的步骤7)采掘设备封闭所述主井(3)。
- 根据权利要求1所述的实现CO 2地下封存的煤炭流态化开采方法,其特征在于,所述采掘设备(5)包括依次串联连接的第一采掘仓(51)、第一分选仓(52)、第一转化仓(53)、第一储能仓(54)、充填支护仓(59)、第二储 能仓(55)、第二转化仓(56)、第二分选仓(57)和第二采掘仓(58),所述采掘设备(5)能够沿第一采掘仓(51)或者第二采掘仓(58)的采掘方向掘进。
- 根据权利要求5所述的实现CO 2地下封存的煤炭流态化开采方法,其特征在于,所述步骤4)中,所述采掘设备(5)沿所述采掘条带(2)进行全断面掘进开采时具体为:开启所述采掘设备(5)一侧的所述第一采掘仓(51)的所述盾构刀盘,对一条所述采掘条带(2)进行采掘;在完成所述采掘条带(2)的采掘施工后,关闭所述采掘设备(5)的所述第一采掘仓(51)的所述盾构刀盘,开启所述采掘设备(5)的另一侧的所述第二采掘仓(58)的所述盾构刀盘并调整所述盾构刀盘的掘进方向,对相邻待掘进的所述采掘条带(2)进行掘进开采;重复上述过程至所述采区的所有采掘条带(2)掘进开采完成。
- 根据权利要求1所述的实现CO 2地下封存的煤炭流态化开采方法,其特征在于,还包括步骤8)在所述采区(1)的所有采掘条带(2)开采完成且充填完成后,在所述采区(1)设置所述主井(3)的位置设置抗渗墙体。
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