Coal mine production synergistic CO2 compression energy storage method based on space autonomous extension seal

Abstract

The present invention discloses a coal mine production synergistic CO2 compression energy storage system based on space autonomous extension and sealing, which belongs to the field of mining engineering and includes the following steps: S1, implementing the 1-0 stage of the coal mine production synergistic CO2 compression energy storage system; S2, implementing the early abandoned tunnel transformation and laying the space autonomous extension and sealing device; S3, implementing the 1-1 stage of the coal mine production synergistic CO2 compression energy storage system; S4, implementing the later abandoned tunnel transformation; S5, implementing the 0-2 stage of the coal mine production synergistic CO2 compression energy storage system. The present invention is based on the coal mine production synergistic CO2 compression energy storage system based on space autonomous extension and sealing, through the non-traditional coal retreat mining system and the CO2 compression energy storage system working in parallel, with the space autonomous extension and sealing device, it can realize the synergistic operation of coal production and CO2 compression energy storage, thereby achieving the continuity of coal mining and CO2 compression energy storage in time and independence in space, and improving the utilization rate of coal mine abandoned tunnel resources.

Description

Technical Field

[0001] The present invention relates to the technical field of mining engineering, and in particular to a method for synergizing CO2 compression energy storage in coal mine production based on autonomous spatial extension and sealing. Background Art

[0002] Due to the large-scale emission of carbon dioxide, the global average temperature continues to rise, and the resulting spread of climate-related diseases and frequent severe natural disasters have had a significant impact on the natural ecological environment and human society. In addition, with the gradual increase in my country's demand for coal resources, a large number of abandoned tunnels will be generated after coal mining, and these abandoned tunnels that are not properly handled often cause water pollution, harmful gas pollution, and collapse, landslide geological disasters and other hazards.

[0003] In order to achieve the strategic goals of "carbon peak" and "carbon neutrality", it is particularly important to treat carbon dioxide at low cost and high efficiency. How to effectively solve the hazards caused by abandoned mine tunnels, combine the utilization of abandoned tunnels with energy storage technology, and enable mines to generate value while carrying out coal mining operations is an urgent problem that needs to be solved.

[0004] The more mature air treatment technology currently available is compressed air energy storage technology, which uses electrical energy to compress air and generate internal energy, and then converts the internal energy into electrical energy output. It has fewer restrictions, a short construction period, is environmentally friendly, and has the technical characteristics of large capacity and high power, which can improve energy utilization efficiency.

[0005] Based on the above content, a method of synergistic CO2 compression energy storage for coal mine production based on space autonomous extension sealing is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a method for coordinated CO2 compression energy storage in coal mine production based on space autonomous extension and sealing. Through the parallel operation of a non-traditional coal retreat mining system and a CO2 compression energy storage system, in conjunction with a space autonomous extension and sealing device, the coordinated operation of coal production and CO2 compression energy storage can be achieved, thereby achieving the temporal continuity and spatial independence of coal mining and carbon dioxide compression energy storage, and compensating for electricity or peak-shaving and frequency regulation.

[0007] To achieve the above-mentioned purpose, the present invention provides a method for synergistic CO2 compression energy storage in coal mine production based on space autonomous extension and sealing, comprising the following steps:

[0008] S1. Implement the 1-0 phase of the coal mine production coordinated CO2 compression energy storage system;

[0009] 1-0 means that there is a coal retreat mining system in the coal mining area that is different from the traditional coal mining method, and the CO2 compression energy storage system has not yet been built; first, the mine field is divided into multiple mining areas. In the coal retreat mining system, coal mining will be carried out from the boundary of the field to the main shaft and the auxiliary shaft, and tunnels and transportation tunnels, track tunnels, and return air tunnels will be excavated. A coal mining industrial square is arranged on one side of the field boundary, and a No. 1 return air industrial square is arranged on the other side of the field boundary. A No. 2 return air industrial square is arranged near the mining area adjacent to the coal mining industrial square; after the non-traditional coal retreat mining system is built, the retreat mining operation will be carried out immediately. With the continuous advancement of coal mining, usable abandoned tunnels will be generated after the mining operation;

[0010] The coal mining industrial square is provided with a main shaft and an auxiliary shaft, the No. 1 return air industrial square is provided with a No. 1 return air shaft, and the No. 2 return air industrial square is provided with a No. 2 return air shaft; when performing retreat mining operations, the main shaft and the auxiliary shaft are responsible for transportation work in the coal mining area, and the mine ventilation is achieved by taking in air from the main shaft and the auxiliary shaft, and returning air from the No. 1 return air shaft and the No. 2 return air shaft;

[0011] S2. Implement the reconstruction of abandoned lanes in the early stage;

[0012] The abandoned roadways generated after the implementation of the 1-0 phase of the coal mine production collaborative CO2 compression energy storage system are transformed into gas storage devices for the CO2 compression energy storage system. The abandoned roadways can be used as development roadways and preparation roadways that are no longer needed in the coal mining area. The development roadways and preparation roadways are relatively stable and have less obvious crack development.

[0013] Applying high-pressure sealing material to the development tunnels and preparation tunnels in the mined area; the high-pressure sealing material is composed of two materials, a bottom layer and a top layer;

[0014] A composite high-pressure sealing wall is set at the junction of the preparation tunnel and the mining tunnel, and high-pressure foam sealant is filled in the gaps between the edges of the composite high-pressure sealing wall and the tunnel; and space-autonomous extension sealing devices are set in the transport tunnel, track tunnel, and return air tunnel to isolate the two mining areas for CO2 compression storage and coal mining;

[0015] The composite high-pressure sealing wall frame is composed of a rear plate, a front plate, three baffles, four high-carbon steel meshes, a number of expansion bolts and steel bars, and then concrete is injected into the frame to form a complete composite high-pressure sealing wall.

[0016] The space autonomous extension sealing device is composed of a moving track, a fixed body, a telescopic body, a telescopic support and a sealant nozzle, wherein the moving track is made of manganese steel and the remaining materials are all corrosion-resistant steel;

[0017] The space-autonomous expansion sealing device moves in the lane through the intermittent fit between the left and right fixed bodies and the moving track, so as to realize the continuous expansion of the space of the gas storage device in a sealed environment; specifically, the following steps are included:

[0018] ① After the mining of a mining area is completed, high-pressure sealing materials are applied to the transport tunnel, track tunnel, and return air tunnel where the space autonomous extension sealing device is to move;

[0019] ② The mobile rails are laid on the top, bottom and both sides of the transport lanes, track lanes and return air lanes to ensure the stability of the space autonomous extension sealing device during movement; at the same time, connecting devices are respectively provided on the mobile rails and the fixed body and the telescopic body to ensure the tight fit between the fixed body and the mobile rails; the telescopic body refers to the fixed body that has telescopic performance except for contact with the mobile rails;

[0020] ③ When the space autonomous extension sealing device is in the initial state, the fixed body unfolds the telescopic body, and when the telescopic body contacts the surroundings of the tunnel, the unfolding action stops; at the same time, the sealant nozzle starts to fill the gap between the telescopic body and the tunnel with high-pressure foam sealant;

[0021] ④ When the space autonomous extension sealing device moves, the connection device between the right fixed body, the telescopic body and the moving track is disconnected, the telescopic body is retracted, and the telescopic support is driven by the hydraulic system to start extending, pushing the right fixed body to move forward;

[0022] ⑤ When the telescopic support is at the extension limit, the right fixed body unfolds the telescopic body, and the two reach a stable state through the connection device between the moving track; at the same time, the sealant nozzle starts to fill the gap between the right telescopic body and the roadway with high-pressure foam sealant;

[0023] ⑥ The connection device between the fixed body, telescopic body and moving track on the left side of the space autonomous extension sealing device is disconnected, the telescopic body is retracted, and the telescopic support is driven by the hydraulic system to start contracting, driving the fixed body on the left side to move forward;

[0024] ⑦ When the telescopic support is at the limit of contraction, the left fixed body unfolds the telescopic body, and the two regain a stable state through the connection device between the moving track; at the same time, the sealant nozzle begins to fill the gap between the left telescopic body and the lane with high-pressure foam sealant; at this point, the space autonomous extension sealing device completes a cycle of lane movement in a sealed environment;

[0025] When the mining of a mining area is completed, the space autonomous extension sealing device moves to between the current mining area and the next mining area to be mined, and the two mining areas are isolated. The current mining area is merged into the CO2 compression energy storage system, and the gas storage device space under the CO2 compression energy storage system is continuously expanded;

[0026] S3. Implement the 1-1 phase of the coal mine production coordinated CO2 compression energy storage system;

[0027] 1-1 refers to the existence of a non-traditional coal retreat mining system and a CO2 compression energy storage system in the coal mining area; Phase 1-1 is centered on the No. 1 return air industrial square, where compressors, heat storage devices, gas pipelines and turbine devices are installed, and the No. 1 return air shaft at the lower end of the No. 1 return air industrial square is used to connect the gas storage device transformed from the previous abandoned tunnel with the ground equipment to build a CO2 compression energy storage system;

[0028] At this time, the space autonomous extension sealing device is set in the transportation tunnel, track tunnel and return air tunnel between the first and second mining areas, providing conditions for the CO2 compression energy storage system to work in coordination with the non-traditional coal retreat mining system described in S1;

[0029] As the mining area is continuously mined, the abandoned tunnel reconstruction work in S2 continues in the mined area, and the space-autonomous extension sealing device is continuously moving toward the main shaft and the auxiliary shaft. Due to the mobile sealing performance of the space-autonomous extension sealing device, the space of the gas storage device on the left side of the device is continuously expanded, and a stable CO2 compression energy storage system is formed; the space of the mining area to be mined on the right side is continuously reduced, and the non-traditional coal retreat mining system is operated normally; when there is only one mining area near the main and auxiliary shafts left in the mining area to be mined, the space-autonomous extension sealing device moves to the transportation tunnel, rail tunnel, and return air tunnel between the mining area and the previous mining area. At this time, the CO2 compression energy storage system on the left side of the space-autonomous extension sealing device and the non-traditional coal retreat mining system on the right side operate together without affecting each other;

[0030] The CO2 compression energy storage system includes a compressor, a heat storage device, a gas storage device, a gas pipeline and a turbine part. The system will be constructed by transforming the No. 1 return air industrial square into a CO2 compression energy storage site and combining it with a gas storage device. After the CO2 compression energy storage system is completed, the main shaft and the auxiliary shaft are still responsible for the transportation work in the coal mining area. The mine ventilation is achieved by the main shaft and the auxiliary shaft taking in air and the No. 2 return air shaft returning air. The No. 1 return air shaft has become a part of the gas storage device in the CO2 compression energy storage system.

[0031] S4. Implement the reconstruction of abandoned lanes in the later period;

[0032] The abandoned late-stage roadway is transformed into a gas storage device according to the step S2; the abandoned late-stage roadway refers to the abandoned roadways available in the mining areas near the main shaft and the auxiliary shaft and the development roadways under the coal mining industrial square after all the mining areas in the coal mining area are mined;

[0033] S5. Implement the 0-2 phase of the coal mine production coordinated CO2 compression energy storage system;

[0034] 0-2 means that there are two CO2 compression energy storage systems in the coal mining area; with the coal mining industrial square as the center, compressors, heat storage devices, gas pipelines, and turbine devices are set up in the industrial site, and the main and auxiliary shafts at the lower end of the coal mining industrial square are used to connect the gas storage device transformed from the later abandoned tunnels and the ground equipment, and a new identical CO2 compression energy storage system is built, and cooperates with the CO2 compression energy storage system in S3; at this time, the No. 2 return air industrial square is closed and no transformation is carried out. After the completion of the new CO2 compression energy storage system, the main shaft, auxiliary shaft and No. 2 return air shaft have become part of the gas storage device in the new CO2 compression energy storage system, and the mine is no longer ventilated.

[0035] Preferably, the composite high-pressure sealing wall frame is composed of 1 rear plate, 1 front plate, 3 baffles, 4 high-carbon steel meshes, a number of expansion bolts and steel bars, and then concrete is injected into the frame to form a complete composite high-pressure sealing wall; when building the composite high-pressure sealing wall, the rear plate is first fixed in the tunnel, that is, the four sides of the rear plate are connected to the four sides of the tunnel; then the three baffles are vertically fixed to the front end of the rear plate at the same intervals using expansion bolts, wherein two baffles have two cross frames vertically distributed at the same intervals on one side, and one side has no cross frame, and the sides of the two baffles without cross frames are fixed tightly against the two sides of the tunnel; two cross frames are vertically distributed at the same intervals on both sides of a baffle, and it is fixed in the center of the tunnel; at this time, upper and lower groups of cross frames are formed in the area of ​​two adjacent baffles. Secondly, fix the four sides of the high-carbon steel wire mesh to the steel bars, and then use a pneumatic steel nail gun to fix the high-carbon steel wire mesh to the upper and lower groups of cross frames respectively, and finally use expansion bolts to fix the front plate to the front side of the three baffles to form left and right cavities; in particular, in order to inject concrete into the cavity, two grouting holes are set on the front plate, and after the concrete is completely solidified in the cavity, the composite high-pressure sealing wall is initially formed; the contact gaps between the composite high-pressure sealing wall and the tunnel are filled with high-pressure foam sealant, and after complete foaming, the construction of the composite high-pressure sealing wall is completed.

[0036] Therefore, the present invention is based on the coal mine production coordinated CO2 compression energy storage method with space autonomous extension and sealing. Through the parallel operation of the non-traditional coal retreat mining system and the CO2 compression energy storage system, and in conjunction with the space autonomous extension and sealing device, it can improve the utilization rate of abandoned coal mine tunnel resources and realize CO2 compression energy storage while coal mining, which is of great significance for protecting the ecological environment of coal mining areas and promoting the construction of carbon peak and carbon neutrality.

[0037] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a flow chart of an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of non-traditional coal retreat mining according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the tunnel structure in the mining area according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the connection between the No. 1 return air shaft and the No. 2 return air shaft according to an embodiment of the present invention;

[0042] Figure 5 A half-section schematic diagram of a composite high-pressure sealing wall according to an embodiment of the present invention;

[0043] Figure 6 Schematic diagram of a space autonomously extendable sealing device according to an embodiment of the present invention Figure 1 ;

[0044] Figure 7 Schematic diagram of a space autonomously extendable sealing device according to an embodiment of the present invention Figure 2 ;

[0045] Figure 8 Schematic diagram of a space autonomously extendable sealing device according to an embodiment of the present invention Figure 3 ;

[0046] Fig. 9 Schematic diagram of a space autonomously extendable sealing device according to an embodiment of the present invention Figure 4 ;

[0047] Fig.10 Schematic diagram of a space autonomously extendable sealing device according to an embodiment of the present invention Figure 5 ;

[0048] Fig.11 Schematic diagram of a space autonomously extendable sealing device according to an embodiment of the present invention Figure 6 ;

[0049] Fig.12 This is a schematic diagram of the structure of the abandoned tunnel transformed into a gas storage device and performing compression energy storage work in stage 1-1 of an embodiment of the present invention;

[0050] Fig.13 It is a schematic diagram of the CO2 compression energy storage system merging mining areas in stage 1-1 of an embodiment of the present invention;

[0051] Fig.14 It is a schematic diagram of the space autonomous extension sealing device no longer moving and the reconstruction of the early abandoned tunnel in stage 1-1 of the embodiment of the present invention;

[0052] Fig.15 This is a schematic diagram of the phase 0-2 of the coal mine production coordinated CO2 compression energy storage system according to an embodiment of the present invention;

[0053] Fig.16 This is a partial schematic diagram of the right side of the sixth mining area in the 0-2 stage of an embodiment of the present invention;

[0054] Reference numerals:

[0055] 1. Main shaft; 2. Auxiliary shaft; 3. No. 1 return air shaft; 4. No. 2 return air shaft; 5. No. 1 return air industrial square; 6. No. 2 return air industrial square; 7. Coal mining industrial square; 8. Space autonomous extension sealing device; 801. Mobile track; 802. Fixed body; 803. Telescopic body; 804. Telescopic support; 805. Sealant nozzle; 9. Return air main lane; 10. Transport main lane; 11. Track main lane; 12. Composite high-pressure sealing wall; 13. Dioxide Carbon dioxide storage sealing door; 14, winch room; 15, first section return air lane; 16, upper parking lot in mining area; 17, transportation up the mountain; 18, rail up the mountain; 19, section transportation lane; 20, second section return air lane; 21, middle parking lot in mining area; 22, mining area substation; 23, lower parking lot in mining area; 24, carbon dioxide compression storage site; 25, gas pipeline; 26, bottom parking lot; 27, main transportation stone gate; 28, rail transportation stone gate. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0057] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0058] Example

[0059] The present invention provides a method for synergizing CO2 compression energy storage in coal mine production based on space autonomous extension and sealing, which specifically includes the following five steps: stage 1-0 of synergizing CO2 compression energy storage system in coal mine production, early abandoned tunnel transformation, stage 1-1 of synergizing CO2 compression energy storage system in coal mine production, late abandoned tunnel transformation, stage 0-2 of synergizing CO2 compression energy storage system in coal mine production;

[0060] The following example will take the case where the development tunnel is a straight-walled round arch tunnel, the preparation and recovery tunnels are rectangular tunnels, and the mine field is divided into six mining areas. Figure 1 As shown, the specific steps are:

[0061] 1. Phase 1-0 of the Coal Mine Production Cooperative CO2 Compression Energy Storage System

[0062] refer to Figure 2This stage aims to build a non-traditional coal retreat mining system. The non-traditional coal retreat mining system refers to a complete set of production systems for coal mining. First, the mine field is divided into the first mining area, the second mining area, the third mining area, the fourth mining area, the fifth mining area and the sixth mining area, and then the tunnels are excavated to arrange coal mining, ventilation, transportation and other systems. The ventilation system adopts mixed ventilation. The No. 1 return air shaft 3 and the No. 2 return air shaft 4 are arranged on the boundary side of the mine field and near the main shaft 1 and the auxiliary shaft 2. The fresh air flow of the mine is taken in by the main shaft 1 and the auxiliary shaft 2, and the No. 1 return air shaft 3 and the No. 2 return air shaft 4 are returned. In addition, three industrial squares are arranged: the No. 1 return air industrial square 5 is arranged based on the No. 1 return air shaft 3; the No. 2 return air industrial square 6 is arranged based on the No. 2 return air shaft 4; the coal mining industrial square 7 is arranged based on the main shaft 1 and the auxiliary shaft 2.

[0063] Traditional coal mining generally adopts forward mining, that is, mining from the bottom of the main shaft 1 and the auxiliary shaft 2 to the other side of the mine field boundary, which can achieve the purpose of rapid coal production and profit generation; different from traditional coal mining, the coal mining here adopts retreat mining, that is, coal mining will be mined from the first mining area close to the other side of the mine field boundary to the main shaft 1 and the auxiliary shaft 2, which can provide strong guarantee for the simultaneous work of later coal mining and carbon dioxide compression and energy storage. After the non-traditional coal retreat mining system is built, the mining work will be carried out immediately from the first mining area to the sixth mining area.

[0064] Since the CO2 compression storage system has not been built at this stage, the coal mining and carbon dioxide compression storage preparation work at this stage can also be called stage 1-0, that is, there is a non-traditional coal retreat mining system at this stage, and there is no CO2 compression storage system.

[0065] 2. Reconstruction of abandoned lanes in the early stage

[0066] like Figure 2-11 During this period, the air is taken in by the main shaft 1 and the auxiliary shaft 2, and the air is returned by the No. 1 return air shaft 3 and the No. 2 return air shaft 4.

[0067] The purpose of the early abandoned tunnel reconstruction is to transform the abandoned tunnels in the mined areas of the coal mining area into gas storage devices for the CO2 compression energy storage system, and to set a space-autonomous extension sealing device 8 in the transportation tunnel. Through the movement of the space-autonomous extension sealing device 8, the space of the gas storage device is gradually expanded. As the coal mining progresses, after the mining of the first mining area is completed, the second to sixth mining areas will continue to be mined (normal operation), and at the same time, the tunnel of the first mining area will be reconstructed, and the abandoned tunnels of this mining area will be transformed into gas storage devices.

[0068] First, a high-pressure sealing material is applied to the No. 1 return air shaft 3 and the return air lane 9 between the first mining area and the preset space self-extending sealing device 8. Then, the same high-pressure sealing material is applied to the winch room 14 of the first mining area, the return air lane 15 of the first section, the upper parking lot 16 of the mining area, the transport uphill 17, the track uphill 18, the section transport lane 19, the return air lane 20 of the second section, the upper mining area middle parking lot 21, the mining area substation 22, etc., starting from the winch room 14 and ending at the middle parking lot 21 of the mining area at the bottom. After that, starting from the transport uphill 17 and the track uphill 18 below the middle parking lot 21 of the mining area at the bottom, passing through the lower parking lot 23 of the mining area to the transport lane 10 between the first mining area and the second mining area and ending at the preset space self-extending sealing device 8 in the track lane 11, the lanes in between are all coated with the same high-pressure sealing material. The high-pressure sealing material is composed of two materials, the bottom layer and the top layer, and has the characteristics of low cost, high pressure resistance, heat resistance and corrosion resistance. The bottom layer material is cement slurry mixed with carbon fiber, which is composed of 48% ordinary Portland cement, 7% water, 17% dispersant, 10% stabilizer, 17% weighting agent and 1% carbon fiber; the top layer material is composed of 71% silicone sealant and 29% filler. During coating, the bottom layer material is evenly sprayed onto the surface of the tunnel through a high-pressure nozzle to ensure that the cracks in the tunnel are filled. After the bottom layer material solidifies, the top layer material is evenly sprayed onto the solidified bottom layer material to achieve complete sealing of the tunnel. After the top layer material is completely solidified, the coating work is completed.

[0069] In addition, a composite high-pressure sealing wall 12 is set at a certain distance between the goaf of the first mining area and the first section return air lane 15 to isolate the return mining lane; a composite high-pressure sealing wall 12 is set at a certain distance between the goaf of the first mining area and the section transport lane 19, and a composite high-pressure sealing wall 12 is set between the uppermost mining area middle parking lot 21 and the second section return air lane 20. According to the above arrangement method, starting from the uppermost mining area middle parking lot 21 to the lowermost mining area middle parking lot 21, the same composite high-pressure sealing wall is arranged in between.

[0070] A high-pressure foam sealant is filled in the contact surface gaps between the edges of all the composite high-pressure sealing walls and the tunnels; in particular, a space-autonomous extension sealing device 8 is set in the transportation tunnel 10, the track tunnel 11, and the return air tunnel 9 between the first mining area and the second mining area. Secondly, a carbon dioxide storage sealing door 13 is set at the wellhead of the No. 1 return air shaft 3, a pressure gauge is installed on the sealing door, and the real-time monitoring of the carbon dioxide gas storage amount is achieved through circuit equipment. In particular, in order to ensure the sealing of the sealing door, a pressure connection device can be installed on the sealing door, and the same high-pressure foam sealant can be filled on the contact surface between the sealing door and the tunnel. After the composite high-pressure sealing wall, the space-autonomous extension sealing device and the carbon dioxide storage sealing door are set, the partial transformation of the abandoned tunnels of the mine is completed.

[0071] The composite high-pressure sealing wall 12 has the characteristics of rapid construction, high pressure resistance and significant sealing effect. It is mainly composed of 1 rear plate, 1 front plate, 3 baffles, 4 high-carbon steel meshes, expansion bolts, steel bars and concrete. Figure 5 . When building the composite high-pressure sealing wall 12, first fix the rear plate in the tunnel, that is, the four sides of the rear plate are connected to the four sides of the tunnel. Then use expansion bolts to vertically fix the three baffles at the same intervals on the front end of the rear plate. Two of the baffles have two cross frames vertically distributed at the same intervals on one side, and one side has no cross frame. The sides of the two baffles without cross frames are fixed tightly against the two sides of the tunnel; two cross frames are vertically distributed at the same intervals on both sides of one baffle, which are fixed in the center of the tunnel. At this time, upper and lower groups of cross frames are formed in the area of ​​two adjacent baffles. Secondly, fix the four sides of the high-carbon steel wire mesh to the steel bars, and then use a pneumatic steel nail gun to fix the high-carbon steel wire mesh to the upper and lower groups of cross frames respectively. Finally, the front plate is fixed to the front side of the three baffles with expansion bolts to form two cavities on the left and right. In particular, two grouting holes are set on the front plate to inject concrete into the cavity. After the concrete is completely solidified in the cavity, the composite high-pressure sealing wall is initially formed. The contact gaps between the composite high-pressure sealing wall 12 and the roadway are filled with high-pressure foam sealant. After complete foaming, the construction of the composite high-pressure sealing wall 12 is completed.

[0072] The space autonomous extension sealing device 8 has the characteristics of high wear resistance, high strength, high flexibility, significant sealing effect, and can realize free movement in the transport tunnel 10, the track tunnel 11, and the return air tunnel 9. It is mainly composed of a moving track 801, a fixed body 802, a telescopic body 803, a telescopic support 804 and a sealant nozzle 805. Figure 6. The movable track 801 is made of manganese steel, and the materials of the remaining parts are corrosion-resistant steel. The fixed body 802 achieves the moving effect by fitting with the movable track. Connecting devices are respectively provided on the movable track, the fixed body, and the telescopic body 803, so that the entire space autonomous extension sealing device is in a stable state. In particular, the movable track is laid on the top, bottom and two sides of the transport tunnel 10, the track tunnel 11, and the return air tunnel 9; the fixed body has telescopic performance except for the place in contact with the movable track, that is, the telescopic body. When the space autonomous extension sealing device does not need to move, the fixed body unfolds the telescopic body, and the unfolding action is stopped when the telescopic body contacts the surrounding of the tunnel. At this time, the sealant nozzle 805 begins to fill the gap between the telescopic body and the tunnel with high-pressure foam sealant to completely achieve the sealing purpose, such as Figure 7 When the mining work in the second mining area is completed, the space autonomous extension sealing device 8 continues to apply high-pressure sealing materials to the transportation tunnel 10, track tunnel 11, and return air tunnel 9 between the second mining area, and lays the moving track. At this time, the connection device between the right fixed body, telescopic body and moving track of the space autonomous extension sealing device is disconnected, the telescopic body is retracted, and the telescopic support 804 is driven by the hydraulic system to start extending, pushing the right fixed body to move forward, such as Figure 8 When the telescopic support is at the extension limit, the right fixed body unfolds the telescopic body, and the two reach a stable state through the connection device between the moving track. The sealant nozzle begins to fill the gap between the right telescopic body and the roadway with high-pressure foam sealant. Fig. 9 ; Then, the connection device between the fixed body, telescopic body and moving track on the left side of the space autonomous extension sealing device is disconnected, the telescopic body is retracted, and the telescopic support is driven by the hydraulic system to start contracting, driving the fixed body on the left side to move forward. Fig.10 ; Finally, when the telescopic support is at the limit of contraction, that is, the initial state, the left fixed body unfolds the telescopic body, and the two regain a stable state through the connection device between the moving track. At the same time, the sealant nozzle begins to fill the gap between the left telescopic body and the roadway with high-pressure foam sealant, such as Fig.11 At this point, the space-autonomous extension sealing device has completed a cycle of tunnel movement in a sealed environment. After multiple periodic movements, the space-autonomous extension sealing device reaches the transportation tunnel 10, track tunnel 11, and return air tunnel 9 between the second and third mining areas, isolating the two mining areas and achieving an absolute sealing effect, making full preparations for the CO2 compression energy storage system to merge with the second mining area. Fig.13 At this time, the first and second mining areas are gas storage devices of the CO2 compression energy storage system, and the third, fourth, fifth and sixth mining areas continue to carry out normal coal mining operations.

[0073] III. Coal Mine Production Cooperative CO2 Compression Energy Storage System 1-1 Phase

[0074] like Figure 12-14 As shown in 16, this step is that the main shaft 1 and the auxiliary shaft 2 take in air, and the No. 2 return air shaft 4 returns air. The coal mine production coordinated CO2 compression energy storage system 1-1 stage aims to build a CO2 compression energy storage system to achieve the parallel operation of the non-traditional coal retreat mining system and the CO2 compression energy storage system.

[0075] After the reconstruction of the abandoned tunnels in the early stage is completed, the No. 1 return air industrial square 5 on the boundary of the well field needs to be refitted to create a compressed energy storage system, build a carbon dioxide compressed energy storage site 24, and combine the gas storage device after the reconstruction of the abandoned tunnels in the early stage of step 2 to build a CO2 compressed energy storage system. The compressor, heat storage device, gas pipeline 25, turbine, etc. specifically involved in the compressed energy storage system are all arranged in the carbon dioxide compressed energy storage site 24. In particular, the abandoned tunnels after the reconstruction of the first mining area here will provide gas storage space and be used as a gas storage device.

[0076] When the compressed energy storage system is working, the gas compression work is first carried out, that is, the surplus electric energy during the low electricity consumption period is input into the compressor to drive the compressor to work, compress the carbon dioxide gas, and use the heat storage device to recover the internal energy generated during the compression process. Next, the gas storage work is carried out, that is, the carbon dioxide compressed gas is sealed in the gas storage device after the transformation of the abandoned lane in the previous step, specifically through the transmission pipeline 25, the No. 1 return air shaft 3, the return air lane 9, the winch room 14, the first section return air lane 15, the upper parking lot 16 of the mining area, the transportation uphill 17, the rail uphill 18, the section transportation lane 19, the second section return air lane 20, the upper mining area middle parking lot 21, and the mining area substation 22; then it is gradually transported along the transportation uphill 17 and the rail uphill 18 to the lower mining area middle parking lot 21 and the mining area lower parking lot 23 to the transportation lane 10 and the rail lane 11 between the first mining area and the second mining area, and sealed at the space autonomous extension sealing device 8.

[0077] During the peak period of electricity consumption or when the power peak and frequency regulation is required, the heat storage device releases the internal energy recovered in the process of compressing the carbon dioxide gas. At the same time, the compressed carbon dioxide gas sealed in the abandoned tunnel of the mine enters the heat storage device through the gas pipeline, expands due to heat and works on the turbine, and the turbine converts the internal energy into electrical energy output, achieving the effect of power compensation or peak and frequency regulation. At this time, the second to sixth mining areas still carry out coal retreat mining normally due to the effect of the space autonomous extension sealing device 8. After the second mining area is mined, the second mining area is subjected to the same early abandoned tunnel transformation process as the first mining area, and then the space autonomous extension sealing device is moved between the second and third mining areas. At this time, the first and second mining areas share a set of CO2 compression energy storage system, and the third to sixth mining areas continue to carry out coal retreat mining. After the mining of the third mining area is completed, the above operation is repeated until the first five mining areas share a set of CO2 compression energy storage system, and the sixth mining area continues to carry out coal mining operations.

[0078] Since there is a non-traditional coal retreat mining system and a CO2 compression energy storage system in the 1-1 stage of the coal mine production coordinated CO2 compression energy storage system, this stage can also be referred to as the 1-1 stage. The two systems work in parallel without affecting each other.

[0079] 4. Reconstruction of abandoned lanes in the later period

[0080] like Figure 14-16 As shown, during this period, the main shaft 1 and the auxiliary shaft 2 were used for air intake, and the No. 2 return air shaft 4 was used for return air. The purpose of the later abandoned tunnel transformation is to transform all available abandoned tunnels in the coal mining area into gas storage devices in the same way as step 2. At this time, all mining areas have been mined, and the space autonomous extension sealing device has moved to the mining area near the main and auxiliary shafts (the sixth mining area) and the previous mining area (the fifth mining area) between the transport tunnel 10, the rail tunnel 11, and the return air tunnel 9.

[0081] Similar to the reconstruction of abandoned tunnels in the first mining area in step 2, a carbon dioxide storage sealing door 13 is first set at the wellhead of the No. 2 return air shaft 4, a pressure gauge is installed on the sealing door, and real-time monitoring of the carbon dioxide gas storage amount is achieved through circuit equipment.

[0082] In order to ensure the sealing performance of the sealing door, a pressure connection device can be installed on the sealing door, and the same high-pressure foam sealant can be filled on the contact surface between the sealing door and the tunnel. Secondly, the No. 2 return air shaft 4, the return air tunnel 9 between the space autonomous extension sealing device 8 and the sixth mining area, the winch room 14 of the sixth mining area, the first section return air tunnel 15, the upper parking lot 16 of the mining area, the transportation uphill 17, the rail uphill 18, the section transportation tunnel 19, the second section return air tunnel 20, the upper mining area middle parking lot 21, the mining area substation 22, etc., starting from the winch room 14, to the middle parking lot 21 of the mining area at the bottom, the tunnels between them are coated with the same high-pressure sealing material. After that, starting from the transportation uphill 17 and the rail uphill 18 below the middle parking lot 21 of the mining area at the bottom, through the lower parking lot of the mining area to the transportation tunnel 10 and the rail tunnel 11, the tunnels in between are all coated with the same high-pressure sealing material. In particular, coating work is carried out on the main shaft 1, auxiliary shaft 2, shaft bottom parking lot, main transportation stone gates and rail transportation stone gates.

[0083] In addition, a composite high-pressure sealing wall 12 is set at a certain distance between the goaf of the sixth mining area and the return air lane 15 of the first section; a composite high-pressure sealing wall 12 is set at a certain distance between the goaf of the sixth mining area and the section transport lane 19, and a composite high-pressure sealing wall 12 is set between the uppermost mining area middle parking lot 21 and the second section return air lane 20. According to the above arrangement method, starting from the uppermost mining area middle parking lot 21 to the lowermost mining area middle parking lot 21, the same composite high-pressure sealing wall 12 is arranged in between. Afterwards, a carbon dioxide storage sealing door 13 is set at the wellhead of the main shaft 1 and the auxiliary shaft 2, and a pressure gauge and a pressure connection device are installed, and a high-pressure foam sealant is filled.

[0084] 5. Phase 0-2 of the Coal Mine Production Synergistic CO2 Compression Energy Storage System

[0085] like Fig.15 , 16 As shown, there is no underground ventilation in this step. The purpose of the 0-2 phase of the coal mine production synergistic CO2 compression energy storage system is to transform the coal mining industrial square 7 into the same CO2 compression energy storage site 24 as step 3, and to build the same CO2 compression energy storage system in combination with the gas storage device after the later abandoned roadway transformation, and further utilize the abandoned roadways in the entire mining area for CO2 compression energy storage.

[0086] After the reconstruction of abandoned tunnels is completed, the sixth mining area relies on the carbon dioxide compression energy storage site 24, uses the carbon dioxide compressor to compress the carbon dioxide gas, and uses the heat storage device to recover the internal energy generated during the compression process. After that, the compressed carbon dioxide gas is transported through the transmission pipeline 25, the main shaft 1, the auxiliary shaft 2, the bottom yard 26, the main transportation stone gate 27, the rail transportation stone gate 28, the transportation lane 10, the rail lane 11 to the lower yard 23 of the sixth mining area, and the middle yard 21 of the mining area at the bottom; then it is gradually transported along the transportation uphill 17 and the rail uphill 18 to the mining area substation 22, the upper middle yard 21 of the mining area, the second section return air lane 20, the section transportation lane 19, the mining area upper yard 16, the first section return air lane 15, the winch room 14, the return air lane 9 between the space autonomous extension sealing device 8 and the sixth mining area, and the return air shaft for storage. During peak electricity consumption or when electricity peaking and frequency regulation is required, the heat storage device releases internal energy and acts on the compressed carbon dioxide gas, which expands and then works on the turbine to output electrical energy in disguised form. At this time, the original carbon dioxide compression energy storage sites in the first, second, third, fourth and fifth mining areas are still performing normal carbon dioxide compression energy storage work.

[0087] Since coal mining has ended and all mine production has been shut down, the 0-2 stage of the coal mine production coordinated CO2 compression energy storage system can also be referred to as the 0-2 stage, that is, there is no non-traditional coal retreat mining system in this stage, and there are two CO2 compression energy storage systems. In this stage, the two CO2 compression energy storage systems work simultaneously, which can achieve the complete utilization of the abandoned mine tunnels, not only can the carbon dioxide be sealed, but also can perform energy storage work, compensate and regulate electricity.

[0088] Therefore, the present invention is based on the method of coordinated CO2 compression energy storage in coal mine production with autonomous extension and sealing in space. Through the parallel operation of the non-traditional coal retreat mining system and the CO2 compression energy storage system, and in cooperation with the autonomous extension and sealing device in space, the coordinated operation of coal production and CO2 compression energy storage can be achieved, thereby achieving the temporal continuity and spatial independence of coal mining and carbon dioxide compression energy storage, and compensating for or peak-shaving and frequency-modulating electricity; at the same time, it can promote the construction of carbon peak and carbon neutrality.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for synergistic CO2 compression energy storage in coal mine production based on space autonomous extension and sealing, characterized in that: The following steps are involved: S1. Implement the 1-0 phase of the coal mine production coordinated CO2 compression energy storage system; 1-0 means that there is a coal retreat mining system in the coal mining area that is different from the traditional coal mining method, and the CO2 compression energy storage system has not yet been built; first, the mine field is divided into multiple mining areas. In the coal retreat mining system, coal mining will be carried out from the boundary of the field to the main shaft and the auxiliary shaft, and tunnels and transportation tunnels, track tunnels, and return air tunnels will be excavated. A coal mining industrial square is arranged on one side of the field boundary, and a No. 1 return air industrial square is arranged on the other side of the field boundary. A No. 2 return air industrial square is arranged near the mining area adjacent to the coal mining industrial square; after the non-traditional coal retreat mining system is built, the retreat mining operation will be carried out immediately. With the continuous advancement of coal mining, usable abandoned tunnels will be generated after the mining operation; The coal mining industrial square is provided with a main shaft and an auxiliary shaft, the No. 1 return air industrial square is provided with a No. 1 return air shaft, and the No. 2 return air industrial square is provided with a No. 2 return air shaft; In the process of retreat coal mining, the main shaft and the auxiliary shaft are responsible for transportation work, and the mine ventilation is through the main shaft and the auxiliary shaft for air intake, and the No. 1 return air shaft and the No. 2 return air shaft for air return; S2. Implement the reconstruction of abandoned lanes in the early stage; The abandoned tunnels generated after the implementation of the 1-0 phase of the coal mine production collaborative CO2 compression energy storage system are transformed into gas storage devices for the CO2 compression energy storage system, and high-pressure sealing materials are applied to the development tunnels and preparation tunnels in the mined area; the high-pressure sealing materials are composed of two materials, a bottom layer and a top layer; A composite high-pressure sealing wall is set at the junction of the preparation tunnel and the mining tunnel, and high-pressure foam sealant is filled in the gaps between the edges of the composite high-pressure sealing wall and the tunnel; and space-autonomous extension sealing devices are set in the transport tunnel, track tunnel, and return air tunnel to isolate the two mining areas for CO2 compression storage and coal mining; The composite high-pressure sealing wall frame is composed of a rear plate, a front plate, three baffles, four high-carbon steel meshes, a number of expansion bolts and steel bars, and concrete is injected into the frame to form a complete composite high-pressure sealing wall; The space autonomous extension sealing device is composed of a moving track, a fixed body, a telescopic body, a telescopic support and a sealant nozzle, wherein the moving track is made of manganese steel and the remaining materials are all corrosion-resistant steel; The space-autonomous expansion sealing device moves in the lane through the intermittent fit between the left and right fixed bodies and the moving track, so as to realize the continuous expansion of the space of the gas storage device in a sealed environment; specifically, the following steps are included: ① After the mining of a mining area is completed, high-pressure sealing materials are applied to the transport tunnel, track tunnel, and return air tunnel where the space autonomous extension sealing device is to move; ② The mobile rails are laid on the top, bottom and both sides of the transport lanes, track lanes and return air lanes to ensure the stability of the space autonomous extension sealing device during movement; at the same time, connecting devices are respectively provided on the mobile rails and the fixed body and the telescopic body to ensure the tight fit between the fixed body and the mobile rails; the telescopic body refers to the fixed body that has telescopic performance except for contact with the mobile rails; ③ When the space autonomous extension sealing device is in the initial state, the fixed body unfolds the telescopic body, and when the telescopic body contacts the surroundings of the tunnel, the unfolding action stops; at the same time, the sealant nozzle starts to fill the gap between the telescopic body and the tunnel with high-pressure foam sealant; ④ When the space autonomous extension sealing device moves, the connection device between the right fixed body, the telescopic body and the moving track is disconnected, the telescopic body is retracted, and the telescopic support is driven by the hydraulic system to start extending, pushing the right fixed body to move forward; ⑤ When the telescopic support is at the extension limit, the right fixed body unfolds the telescopic body, and the two reach a stable state through the connection device between the moving track; at the same time, the sealant nozzle starts to fill the gap between the right telescopic body and the roadway with high-pressure foam sealant; ⑥ The connection device between the fixed body, telescopic body and moving track on the left side of the space autonomous extension sealing device is disconnected, the telescopic body is retracted, and the telescopic support is driven by the hydraulic system to start contracting, driving the fixed body on the left side to move forward; ⑦ When the telescopic support is at the limit of contraction, the left fixed body unfolds the telescopic body, and the two regain a stable state through the connection device between the moving track; at the same time, the sealant nozzle begins to fill the gap between the left telescopic body and the lane with high-pressure foam sealant; at this point, the space autonomous extension sealing device completes a cycle of lane movement in a sealed environment; When the mining of a mining area is completed, the space autonomous extension sealing device moves to between the current mining area and the next mining area to be mined, and the two mining areas are isolated. The current mining area is merged into the CO2 compression energy storage system, and the gas storage device space under the CO2 compression energy storage system is continuously expanded; S3. Implement the 1-1 phase of the coal mine production coordinated CO2 compression energy storage system; 1-1 refers to the existence of a non-traditional coal retreat mining system and a CO2 compression energy storage system in the coal mining area; Phase 1-1 is centered on the No. 1 return air industrial square, where compressors, heat storage devices, gas pipelines and turbine devices are installed, and the No. 1 return air shaft at the lower end of the No. 1 return air industrial square is used to connect the gas storage device transformed from the previous abandoned tunnel with the ground equipment to build a CO2 compression energy storage system; After the CO2 compression energy storage system is completed, the No. 1 return air shaft has become part of the gas storage device in the CO2 compression energy storage system. The main shaft and the auxiliary shaft continue to be responsible for transportation. The mine ventilation takes in air through the main shaft and the auxiliary shaft, and the No. 2 return air shaft returns air. S4. Implement the reconstruction of abandoned lanes in the later period; The abandoned late-stage roadway is transformed into a gas storage device according to the step S2; the abandoned late-stage roadway refers to the abandoned roadways available in the mining areas near the main shaft and the auxiliary shaft and the development roadways under the coal mining industrial square after all the mining areas in the coal mining area are mined; S5. Implement the 0-2 phase of the coal mine production coordinated CO2 compression energy storage system; 0-2 means that there are two CO2 compression energy storage systems in the coal mining area; with the coal mining industrial square as the center, compressors, heat storage devices, gas pipelines, and turbine devices are installed in the industrial site. At the same time, the main and auxiliary shafts at the lower end of the coal mining industrial square are used to connect the gas storage device transformed from the later abandoned tunnels and the ground equipment, and a new identical CO2 compression energy storage system is built, which cooperates with the CO2 compression energy storage system in S3; at this time, the No. 2 return air industrial square is closed and no transformation is carried out. The main shaft, auxiliary shaft, and No. 2 return air shaft have all become part of the gas storage device in the newly built CO2 compression energy storage system, and the mine is no longer ventilated.

Images