A method for generating electricity by pumping water storage in an abandoned underground gasification mine

Abstract

The present invention specifically discloses a pumped storage power generation method for underground gasification abandoned mines, including coal seam gasification, tunnel reconstruction, water supply power generation, and pumping water: selecting a level, establishing support isolation walls inside and outside the coal seam, drilling vertical holes to install air supply pipes and air transmission pipes, and connecting gas injection pipes and gas collecting pipes, using electronic lighters to ignite the coal seam and gas, the gas collecting pipes collect gas and output it through the gas transmission pipes, and after the gasification working face is fully burned, the gasification working face is extinguished and the remaining combustion residues are cleaned; waterproofing and reinforcing the support isolation walls, expanding the original air supply pipes into water pipe channels, connecting to ground ponds, excavating power generation pump rooms, water supply lanes and water transmission lanes, and connecting the power generation pump room and the level; storing ground water sources at high levels, opening the water supply lanes during peak electricity consumption, and using the potential energy of the water body to drive the turbine generator in the power generation pump room to generate electricity; using the pressure pump in the power generation pump room to send the water source stored in the bottom level to the high level through the water transmission lane during peak electricity consumption.

Description

Technical field:

[0001] The invention relates to the field of abandoned mine energy storage power generation, and in particular to an underground gasification abandoned mine pumped storage power generation method. Background technology:

[0002] Electricity has become an indispensable energy source in work and life, but there is a serious imbalance in the use of electricity. The electricity consumption is high during the day and greatly reduced at night, resulting in daily power restrictions and waste of electricity at night. Therefore, the use of pumped storage to utilize idle power sources is a good way to store and generate electricity, which plays a great role in solving the peak and valley electricity consumption. The so-called pumped storage power generation is to use the surplus electricity to pump water when the power grid is abundant, that is, to pump water into a specially built mountaintop reservoir on the top of the mountain through a water pump, and consume the surplus electricity in the power grid to drive the reversible pump turbine to pump water, and raise the water to the mountaintop reservoir, which increases the potential energy of this part of the water body, and uses the potential energy of the water body to drive the turbine generator to increase power generation during the peak period of electricity consumption.

[0003] However, the site selection problem has always plagued the construction of pumped storage power stations. Therefore, building energy storage power stations in conjunction with abandoned mines is a very promising way of energy storage. It is not only conducive to broadening the scope of energy storage site selection, making the power station site closer to load centers, new energy bases, and intersections of ultra-high voltage lines, thereby promoting safe and stable operation of the power grid, but also can form a new energy microgrid system based on the energy development situation in the mining area, so that the mining area can be transformed from a large industrial water and electricity consumer to a new energy power output site; at the same time, using mine caves to build energy storage can reduce the amount of dam construction and land acquisition costs, alleviate water evaporation problems, and effectively save project investment; in addition, it can also promote the restoration of the natural ecological environment in the mining area, drive the development of surrounding related industries, and realize the transformation of waste into treasure, and it does not require valley conditions, arable land, and immigration problems are relatively small.

[0004] However, most mines currently use the backfill mining method, and a large amount of tunnel reconstruction work is required for pumping and storing water in the tunnels after mining. For this reason, the present invention proposes an underground gasification abandoned mine pumped storage power generation method, which uses gasification to complete coal seam mining. At the same time, the abandoned mine after mining can retain a relatively complete water storage space, which can be used for pumped storage power generation with a little design, which not only ensures the economic benefits of mine production, but also utilizes the abandoned mine for reuse power generation. Summary of the invention:

[0005] In view of the problems existing in the prior art, the present invention provides a method for generating electricity by pumping water in an underground gasified abandoned mine.

[0006] The present invention discloses a method for generating power by pumping water and storing energy in an underground gasified abandoned mine, including coal seam gasification, tunnel reconstruction, water supply and power generation, and pumping and pumping, and is characterized in that:

[0007] Step 1: Select two levels with an elevation difference of more than 400m, build support isolation walls inside and outside the designed coal seam, drill vertical holes to install gas supply pipes and gas transmission pipes, and respectively pass them into the support isolation walls, connect the gas injection pipes and gas collection pipes, install the gas injection pipes on both sides of the support isolation walls, and install the gas collection pipes in the reserved gas collection tunnels. Use electronic lighters to ignite the coal seam and gas, control the gas in the gas supply pipe to adjust the temperature of the gasification working face, and the gas collection pipe collects the gas and outputs it through the gas transmission pipe. After the gasification working face is fully burned, extinguish the gasification working face, open the protective isolation door to clean up the remaining combustion residues after the internal safety, and complete the coal seam gasification;

[0008] Step 2: Remove the gas collecting pipe and gas transmission pipe, waterproof and reinforce the supporting isolation wall, expand the original gas transmission pipe into a water pipe channel, connect the ground pond, and excavate the power generation pump room between the two levels, and excavate the water transmission lane and water transmission lane to connect the power generation pump room and the two levels to complete the lane reconstruction;

[0009] Step three: store the ground water source in the high level during the peak and valley period of electricity consumption. When the peak period of electricity consumption comes, open the water delivery tunnel, use the potential energy of the water body to drive the turbine generator in the power generation pump room to generate electricity, and store it in the low level to complete the water delivery and power generation;

[0010] Step 4: When the electricity consumption is at its peak or valley, the water source stored in the lower level is sent to the higher level through the water conveyance tunnel by the pressure pump in the power generation pump room, waiting for the next power generation operation to complete the pumping and water extraction.

[0011] Furthermore, the abandoned mines can be gasified at two or more levels, and multiple levels of power generation can be carried out according to the depth of underground excavation.

[0012] Furthermore, the support isolation wall meets the support requirements of the gasification working face and avoids roof collapse after gasification.

[0013] Furthermore, the gas in the air supply pipe can be adjusted by adding gasifying agents, water vapor, inert gas, etc.

[0014] Furthermore, water supply lanes and water transmission lanes may be excavated or pre-buried with pipes. Description of the drawings:

[0015] Figure 1 It is a structural schematic diagram of a method for underground gasification abandoned mine pumped storage power generation according to the present invention.

[0016] Figure 2 yes Figure 1 Schematic top view of .

[0017] In the figure: 1 is the ground; 2 is the ground pond; 3 is the air supply pipe; 4 is the supporting isolation wall; 5 is the gasification working face; 6 is the air injection pipe; 7 is the air transmission pipe; 8 is the water supply lane; 9 is the power generation pump room; 10 is the water transmission lane; 11 is the protective isolation door; 12 is the gas collecting pipe. Specific implementation method:

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] Step 1: Select two levels with a height difference greater than 400m, build support isolation walls 4 inside and outside the designed coal seam, drill vertical holes to install gas supply pipes 3 and gas transmission pipes 7, and respectively pass them into the support isolation wall 4, connect the gas injection pipe 6 and the gas collection pipe 12, the gas injection pipe 6 is installed on both sides of the support isolation wall 4, and the gas collection pipe 12 is installed in the reserved gas collection laneway, use an electronic lighter to ignite the coal seam and gas, control the gas in the gas supply pipe 3 to adjust the temperature of the gasification working face 5, the gas collection pipe 12 collects the gas and outputs it through the gas transmission pipe 7, after the gasification working face 5 is fully burned, extinguish the gasification working face 5, and open the protective isolation door 11 to clean up the remaining combustion residue after the internal safety, and complete the coal seam gasification;

[0020] Step 2: Remove the gas collecting pipe 12 and the gas transmission pipe 7, waterproof and reinforce the supporting isolation wall 4, expand the original gas transmission pipe 3 into a water pipe channel, connect the ground pond 2, and excavate the power generation pump room 9 between the two levels, and excavate the water transmission lane 8 and the water transmission lane 10, connect the power generation pump room 9 and the two levels, and complete the lane reconstruction;

[0021] Step 3: When the electricity consumption peaks or valleys, the ground water source 1 is stored in the high level. When the electricity consumption peak arrives, the water delivery lane 8 is opened, and the water potential energy is used to drive the turbine generator in the power generation pump room 9 to generate electricity, and the water is stored in the low level to complete the water delivery and power generation;

[0022] Step 4: When the electricity consumption is at its peak or valley, the water stored in the lower level is sent to the higher level through the water conveyance tunnel 10 by the pressure pump in the power generation pump room 9, waiting for the next power generation operation to complete the pumping and water extraction.

[0023] Furthermore, the abandoned mines can be gasified at two or more levels, and multiple levels of power generation can be carried out according to the depth of underground excavation.

[0024] Furthermore, the supporting isolation wall 4 meets the support requirements of the gasification working face 5 to prevent the roof from collapsing after gasification.

[0025] Furthermore, the gas in the gas supply pipe 3 can be adjusted by adding a gasifying agent, water vapor, an inert gas, etc.

[0026] Furthermore, the water supply lane 8 and the water delivery lane 10 may be formed by digging tunnels or pre-buried pipes.

[0027] Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. It should be noted that all equivalent substitutions and obvious deformation forms made by any technician familiar with the field under the guidance of this specification fall within the essential scope of this specification and should be protected by the present invention.

Claims

1. A method for pumped storage power generation in an underground gasification abandoned mine, comprising coal seam gasification, tunnel reconstruction, water supply power generation, and pumping water, characterized in that: Step 1: Select two levels with an elevation difference of more than 400m, build support isolation walls inside and outside the designed coal seam, drill vertical holes to install gas supply pipes and gas transmission pipes, and respectively pass them into the support isolation walls, connect the gas injection pipes and gas collection pipes, install the gas injection pipes on both sides of the support isolation walls, and install the gas collection pipes in the reserved gas collection tunnels. Use electronic lighters to ignite the coal seam and gas, control the gas in the gas supply pipe to adjust the temperature of the gasification working face, and the gas collection pipe collects the gas and outputs it through the gas transmission pipe. After the gasification working face is fully burned, extinguish the gasification working face, open the protective isolation door to clean up the remaining combustion residues after the internal safety, and complete the coal seam gasification; Step 2: Remove the gas collecting pipe and gas transmission pipe, waterproof and reinforce the supporting isolation wall, expand the original gas transmission pipe into a water pipe channel, connect the ground pond, and excavate the power generation pump room between the two levels, and excavate the water transmission lane and water transmission lane to connect the power generation pump room and the two levels to complete the lane reconstruction; Step three: store the ground water source in the high level during the peak and valley period of electricity consumption. When the peak period of electricity consumption comes, open the water delivery tunnel, use the potential energy of the water body to drive the turbine generator in the power generation pump room to generate electricity, and store it in the low level to complete the water delivery and power generation; Step 4: When the electricity consumption is at its peak or valley, the water stored in the low-level water source is sent to the high-level water source through the water conveyance tunnel by the pressure pump in the power generation pump room, waiting for the next power generation operation to complete the pumping and water extraction.

2. The underground gasification abandoned mine pumped storage power generation method according to claim 1, characterized in that: The number of levels of the gasified abandoned mine is more than two, and multiple stages of power generation are carried out according to the underground excavation depth.

3. The underground gasification abandoned mine pumped storage power generation method according to claim 1, characterized in that: The support isolation wall meets the support requirements of the gasification working face and prevents the roof from collapsing after gasification.

4. The underground gasification abandoned mine pumped storage power generation method according to claim 1, characterized in that: When the gas in the air delivery pipe is adjusted, one or more of a gasifying agent, water vapor, and an inert gas is added.

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