Operating mine goaf filling transformation structure, transformation method and gas storage method

Abstract

The operation mine goaf filling transformation structure comprises an air compression system and a power generation system which are located on the ground, an auxiliary shaft and a main shaft are dug between the ground and an underground stope working face, a coal mining area is arranged in front of the stope working face, and the coal mining area is provided with a hydraulic support in a matched mode. A filling operation area is arranged behind the working face of the stope, the filling operation area comprises a plurality of filling bodies and inflation spaces located between every two adjacent filling bodies, a gas storage bag is arranged in each inflation space, and a gas storage valve and a gas release valve are arranged at the two ends of each gas storage bag respectively; the underground goaf utilization form is innovated, the strip filling mining technology and the energy storage space are cooperatively planned, the three-dimensional space transformation technology of the goaf is developed, and the goaf energy storage space structure combination with the reinforced concrete lining, the steel plate reinforcement and the gas storage bags is innovatively adopted.

Description

Technical Field

[0001] The present invention relates to a filling and reforming structure for goafs in operating mines, and in particular to a filling and reforming structure for goafs in operating mines, a reforming method and a gas storage method. Background Art

[0002] The current situation of the development and utilization of idle goafs underground is not yet sufficient. A large number of abandoned mines are simply sealed, resulting in the idle phenomenon of underground space resources.

[0003] In the treatment of goafs, the existing technologies in this field are the caving method or the filling method. The caving method will not only leave more goaf spaces, but also cause problems such as surface subsidence. Although the filling method reduces the amount of surface subsidence to a certain extent and solves the problem of waste of goafs, its high filling cost discourages many enterprises. Based on this, the partial filling mining technology has been proposed in the field, which only fills part of the goaf, reducing the filling cost and controlling the displacement and deformation of overlying strata, but there is still the problem that the unfilled goaf cannot be reasonably utilized when using the partial filling mining technology.

[0004] The new energy power industry in China has developed rapidly. However, the regional characteristics of new energy such as wind energy and solar energy pose challenges to the stable operation of the power grid. Energy storage technology has received attention because it can effectively solve the problem of stable power supply. Worldwide, after years of exploration, compressed air energy storage (CAES) technology has built a certain number of gas storage power stations at home and abroad. CAES technology requires a large energy storage space and currently mainly relies on salt cavern gas storage power stations. The salt cavern conditions in China limit the development of CAES. As a major coal country, China has many mines. Research on the development of CAES technology using abandoned mines has made progress, but there are problems of poor stability and high risk.

[0005] In view of the technical bottlenecks, we propose a structure and a gas storage method for reforming the unfilled area of the goaf, transforming the unstable space into a safe energy storage space. Summary of the Invention

[0006] In order to solve the deficiencies of the above technologies, the present invention provides a filling and reforming structure for goafs in operating mines, a reforming method and a gas storage method.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: The filling and reform structure of the goaf in an operating mine includes an air compression system and a power generation system located on the ground. An auxiliary shaft and a main shaft are dug between the ground and the stope working face underground. The front of the stope working face is the coal mining area, which is equipped with hydraulic supports. The rear of the stope working face is the filling operation area, which includes several filling bodies and an inflatable space located between two adjacent filling bodies. An air storage bag is arranged in each inflatable space, and an air storage valve and an air release valve are respectively arranged at both ends of the air storage bag;

[0008] The air compression system is connected with an air inlet pipeline whose other end is communicated with the air storage valve of the air storage bag, and the air release valve is connected with an air outlet pipeline.

[0009] Further, track roads and transportation roads are respectively formed on both sides of the stope working face. The air inlet pipeline is arranged in the track road and runs through the auxiliary shaft, and the air outlet pipeline is arranged in the transportation road and runs through the main shaft.

[0010] Further, the hydraulic supports are located between the coal mining area and the filling operation area.

[0011] Further, reinforced concrete linings are constructed on both the top and bottom of the filling operation area. Steel plates surrounding the air storage bag are arranged in the inflatable space, and the steel plates at the top and bottom are respectively in contact with the reinforced concrete linings on their respective sides.

[0012] A reform method for the filling and reform structure of the goaf in an operating mine includes the following steps:

[0013] S1. Determine the strip filling step distance in the goaf behind the stope working face of the operating mine to delimit the filling operation area;

[0014] S2. Construct reinforced concrete linings on the top and bottom of the goaf delimited as the filling operation area respectively;

[0015] S3. Set steel plates with a hollow cavity formed by surrounding on all sides in the filling operation area according to the strip filling step distance to delimit and form an inflatable space;

[0016] S4. Lay an air storage bag in the hollow cavity of the steel plate;

[0017] S5. Transport the compressed air to the stope working face through the air inlet pipeline by the air compression system and store it in the air storage bag.

[0018] A gas storage method for the filling and reform structure of the goaf in an operating mine includes the following steps:

[0019] A1. Open the air storage valve of the air storage bag and close the air release valve of the air storage bag;

[0020] A2. Start the air compression system to transport the compressed air to the air storage bag through the air inlet pipeline, so that the air storage bag expands gradually until it fills the hollow cavity of the steel plate;

[0021] A3. As the stope working face advances, construct an inflatable space in the unfilled area within the filling operation area to accommodate new air storage bags;

[0022] A4. Repeat step A2 to inject compressed air into the newly added air storage bags to form a multi-stage parallel air storage system.

[0023] Furthermore, the inflation rate of the air storage bag in A2 is synchronized with the advancing speed of the filling operation area to ensure that the expansion process of the air storage bag is always within the support range of the filling body for the inflatable space.

[0024] Furthermore, the air release valve is connected to the air outlet pipeline. When taking air, close the air storage valve and open the air release valve, and the compressed air is output to the ground through the air outlet pipeline.

[0025] An air storage method for the filling and transformation structure of the goaf in an operating mine, an innovation in the utilization form of the underground goaf, enables the coordinated planning of the strip filling mining technology and the energy storage space, develops the three-dimensional space transformation process for the goaf, and innovatively adopts the combined structure of the reinforced concrete lining, steel plate reinforcement, and air storage bag for the energy storage space in the goaf. Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a design diagram of the energy storage space of the present invention.

[0028] Figure 3 It is a layout diagram of the stope working face of the present invention.

[0029] In the figure: 1. Air compression system; 2. Power generation system; 3. Air inlet pipeline; 4. Auxiliary shaft; 5. Main shaft; 6. Coal mining area; 7. Hydraulic support; 8. Filling body; 9. Steel plate; 10. Air storage bag; 11. Reinforced concrete lining; 12. Track roadway; 13. Transportation roadway; 14. Air storage valve; 15. Air release valve; 16. Cut-eye of the stope working face; 17. Air outlet pipeline. Detailed Embodiment

[0030] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0031] As Figures 1-3 Collectively shown, this embodiment relates to an air storage method for the filling and transformation structure of the goaf in an operating mine, forming a dual-energy system with coordinated operation of energy extraction and energy storage, and transforming the originally unstable goaf into a safe energy storage space.

[0032] like Figures 1-3 As shown together, the filling and reconstruction structure of the goaf area of the operating mine includes an air compression system 1 and a power generation system 2 located on the ground. The air compression system 1 and the power generation system 2 are existing technologies. An auxiliary shaft 4 and a main shaft 5 are dug between the ground and the underground mining working face of the operating mine. The auxiliary shaft 4 of this embodiment is not only used for energy input, but also for emergency evacuation of personnel and transportation of large equipment. The main shaft 5 of this embodiment is not only used for energy output, but also for daily entry and exit of personnel and equipment and transportation of mined coal.

[0033] like Figure 1 As shown, the front of the working face of the mining field is the coal mining area 6, and the coal mining area 6 is equipped with a hydraulic support 7. The rear of the working face of the mining field is the filling operation area. It can be understood that the hydraulic support 7 is located between the coal mining area 6 and the filling operation area. The hydraulic support 7 is used to ensure that the coal mining operation and the filling operation are carried out synchronously. The hydraulic support 7 is a common equipment of the strip coal mining method, which is hereby explained; Figure 1 The air compression system 1 shown is connected to the other end as Figure 3 As shown, the air intake pipeline 3 is connected to the air storage valve 14 of the air storage bag 10, and the air release valve 15 is connected to the air outlet pipeline 17. On this basis, the air intake pipeline 3 is arranged in the track tunnel 12 and passes through the auxiliary shaft 4, and the air outlet pipeline 17 is arranged in the transport tunnel 13 and passes through the main shaft 5.

[0034] Preferably, a track tunnel 12 and a transport tunnel 13 are formed on both sides of the mining working face, and a working face cut-out 16 is formed at the end of the mining working face. The track tunnel 12, the transport tunnel 13 and the working face cut-out 16 form a U-shaped ventilation tunnel.

[0035] Combination Figures 1-3 As shown together, the filling operation area includes a plurality of filling bodies 8 and an inflation space located between two adjacent filling bodies 8, and an air storage bag 10 is arranged in each inflation space. It should be noted that, in actual applications, the air storage bag 10 needs to be made of a material that is resistant to high pressure, high temperature, corrosion, water resistance, and strong sealing properties, which can be customized with the supplier, and the material is not limited in this embodiment; the top and bottom of the filling operation area are constructed with reinforced concrete linings 11, and the inflation space is provided with steel plates 9 surrounding the air storage bags 10, and the top and bottom steel plates 9 are respectively in contact with the reinforced concrete linings 11 on their respective sides.

[0036] The method for transforming the structure of the backfilling transformation of the goaf area of an operating mine comprises the following steps:

[0037] S1. Determine the strip filling step distance in the goaf behind the working face of the operating mine to define the filling operation area. It can be understood that the strip filling method is used for transformation in this embodiment, and those skilled in the art are familiar with the specific operation of the strip filling method;

[0038] S2. Construct reinforced concrete linings 11 on the top and bottom of the goaf designated as the filling operation area respectively. For the sake of close structural contact, smooth the surface of the reinforced concrete linings 11.

[0039] S3. Set up steel plates 9 that surround and form a hollow cavity within the filling operation area according to the strip filling step distance to delimit and form an air inflation space, ensuring the structural safety of the air inflation space. It can be understood that the air inflation space is actually the energy storage space.

[0040] S4. Lay gas storage bags 10 in the hollow cavity of the steel plates 9.

[0041] S5. Transport the compressed air through the air compression system 1 to the stope working face via the air inlet pipeline 3 and store it in the gas storage bags 10.

[0042] It should be noted that during the transformation of the filling and reforming structure of the goaf in an operating mine, when the goaf space is sufficient, arrange the first row of gas storage bags 10. The evaluation criterion for sufficient space is that the advancing distance of the stope working face does not exceed the initial weighting interval.

[0043] The gas storage method for the filling and reforming structure of the goaf in an operating mine includes the following steps:

[0044] A1. Open the gas storage valve 14 of the gas storage bag 10 and close the gas release valve 15 of the gas storage bag 10.

[0045] A2. Start the air compression system 1 to transport the compressed air through the air inlet pipeline 3 into the gas storage bag 10, so that the gas storage bag 10 gradually expands until it fills the hollow cavity of the steel plates 9.

[0046] A3. As the stope working face advances, construct an air inflation space in the unfilled area within the filling operation area to accommodate new gas storage bags 10.

[0047] A4. Repeat step A2 to inject compressed air into the newly added gas storage bags 10 to form a multi-stage parallel gas storage system.

[0048] Preferably, the inflation rate of the gas storage bag 10 in A2 is synchronized with the advancing speed of the filling operation area, ensuring that the expansion process of the gas storage bag 10 is always within the support range of the filling body 8 for the air inflation space.

[0049] The gas release valve 14 is connected to the air outlet pipeline 17. When taking gas, close the gas storage valve 13 and open the gas release valve 14, and the compressed air is output to the ground through the air outlet pipeline 17.

[0050] The present application discloses a filling and reforming structure, a reforming method and a gas storage method for the goaf of an operating mine, innovates the utilization form of the underground goaf, enables the collaborative planning of the strip filling mining technology and the energy storage space, develops a three-dimensional space reforming process for the goaf, and innovatively adopts a combined structure of a goaf energy storage space composed of a reinforced concrete lining, a steel plate reinforcement and a gas storage bag.

[0051] The above embodiments are not limitations on the present invention, and the present invention is not limited to the above examples either. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention also fall within the protection scope of the present invention.

Claims

1. An operation mine goaf filling and transformation structure, including an air compression system (1) and a power generation system (2) located on the ground. An auxiliary shaft (4) and a main shaft (5) are dug between the ground and the underground stope working face. It is characterized in that: In front of the stope working face is the coal mining area (6), which is equipped with hydraulic supports (7). Behind the stope working face is the filling operation area, which includes several filling bodies (8) and an air-filled space located between two adjacent filling bodies (8). Each air-filled space is provided with an air storage bag (10), and the two ends of the air storage bag (10) are respectively provided with an air storage valve (14) and a deflation valve (15). The air compression system (1) is connected to an air inlet pipeline (3) whose other end is communicated with the air storage valve (14) of the air storage bag (10), and the deflation valve (15) is connected to an air outlet pipeline (17).

2. The gob filling and transformation structure and gas storage method for operating mines according to claim 1, characterized in that: Track lanes (12) and transportation lanes (13) are respectively formed on both sides of the stope working face. The air inlet pipeline (3) is arranged in the track lane (12) and runs through the auxiliary shaft (4), and the air outlet pipeline (17) is arranged in the transportation lane (13) and runs through the main shaft (5).

3. The filling and transformation structure and gas storage method for the goaf of an operating mine according to claim 1, characterized in that: The hydraulic support (7) is located between the coal mining area (6) and the filling operation area.

4. The goaf filling and reforming structure and gas storage method for an operating mine according to claim 1, characterized in that: Reinforced concrete linings (11) are constructed at the top and bottom of the filling operation area. Steel plates (9) surrounding the air storage bag (10) are arranged in the air-filled space, and the steel plates (9) at the top and bottom are respectively in contact with the reinforced concrete linings (11) on their respective sides.

5. The transformation method of the goaf filling and transformation structure of an operating mine as described in any one of claims 1-4, characterized in that, It includes the following steps: S1. Determine the strip filling step distance in the goaf behind the stope working face of the operating mine to delimit the filling operation area. S2. Construct reinforced concrete linings (11) at the top and bottom of the goaf delimited as the filling operation area respectively. S3. Set steel plates (9) with a hollow cavity formed by surrounding on all sides in the filling operation area according to the strip filling step distance to delimit and form an air-filled space. S4. Lay the air storage bag (10) in the hollow cavity of the steel plate (9). S5. Transport the compressed air to the stope working face through the air inlet pipeline (3) by the air compression system (1) and store it in the air storage bag (10).

6. The gas storage method for the filling and transformation structure of the gob area in an operating mine according to any one of claims 1-4, characterized in that, It includes the following steps: A1. Open the air storage valve (14) of the air storage bag (10) and close the deflation valve (15) of the air storage bag (10). A2. Start the air compression system (1) to transport the compressed air to the air storage bag (10) through the air inlet pipeline (3), so that the air storage bag (10) gradually expands until it fills the hollow cavity of the steel plate (9). A3. As the stope working face advances, construct an air-filled space in the unfilled area in the filling operation area to accommodate a newly added air storage bag (10). A4. Repeat step A2 to inject compressed air into the newly added air storage bag (10) to form a multi-stage parallel air storage system.

7. The gas storage method for the gob filling and reforming structure of an operating mine according to claim 6, characterized in that: The inflation rate of the air storage bag (10) in A2 is synchronized with the advancing speed of the filling operation area to ensure that the inflation process of the air storage bag (10) is always within the support range of the filling body (8) for the air-filled space.

8. The gas storage method for the goaf filling and reforming structure of an operating mine according to claim 6, characterized in that: The deflation valve (14) is connected to the air outlet pipeline (17). When taking air, close the air storage valve (13) and open the deflation valve (14), and the compressed air is output to the ground through the air outlet pipeline (17).

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