CN115853587B - Multi-chamber combined abandoned mine compressed air energy storage method - Google Patents
Multi-chamber combined abandoned mine compressed air energy storage method Download PDFInfo
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Abstract
A multi-chamber combined abandoned mine compressed air energy storage system and a method thereof, the system comprises: the compressed air energy storage power station is arranged on the ground, a plurality of flexible gas storage bags are arranged in the space of the abandoned mine tunnel, and the high-pressure gas transmission pipeline is arranged in the tunnel and is connected with the flexible gas storage bags and the tunnel portal through a pipeline outlet; the method comprises the following steps: selecting abandoned mines meeting gas storage conditions; installing a flexible air storage bag in a waste mine tunnel, and dividing the tunnel into spaces; constructing a compressed air energy storage power station on the ground; the air compressor is driven to work by using the surplus wind power and the surplus photoelectricity, compressed air is filled into each flexible air storage bag through the high-pressure gas transmission pipeline, and compressed air is filled into each tunnel hole; and in the electricity consumption peak period, firstly releasing compressed air in the tunnel cavity to generate electricity, and then releasing compressed air in the flexible gas storage bag to generate electricity. The system and the method can effectively improve the utilization rate of roadway space, have strong universality and are convenient for large-area popularization and application.
Description
Technical Field
The invention belongs to the technical field of underground space utilization and electric power energy storage of abandoned mines, and particularly relates to a multi-cavity combined abandoned mine compressed air energy storage system and method.
Background
With the deep pushing of coal removal capacity, a large number of coal mines are eliminated and become abandoned mines. The closing of a large number of underground mines not only can damage the environment, but also can cause waste of a plurality of resources.
The specific gravity of new energy in the energy structure of China is increased increasingly, and the wind power generation and photovoltaic power generation technologies which are relatively mature in technology are limited by factors such as weather, so that a series of problems such as unstable working state, power generation fluctuation and the like exist, grid connection is difficult, meanwhile, the installed capacity of wind and light is seriously influenced due to the insufficient absorption capacity, and the improvement of the wind and light power generation capacity is influenced. The conventional rigid plugging method for the abandoned mine tunnel is improved, so that the construction difficulty of partial areas is high and the cost is high under the condition of complex surrounding rock, and the rigid plugging occupies the tunnel space and often cuts off the tunnel, so that a large amount of space resources cannot be effectively utilized. Under the circumstance, the urgent need exists to provide a novel tunnel plugging reconstruction technology to realize the efficient utilization of the underground space of the abandoned mine.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-chamber combined abandoned mine compressed air energy storage system and a method thereof, wherein the system has low construction cost, small occupied space in a roadway, can effectively improve the utilization rate of the roadway space, can enable the gas storage process and the gas release power generation process to be more portable, has strong universality and is convenient for large-area popularization and application; the method has simple steps and low implementation cost, can solve the problems of strong fluctuation of wind and light power generation, difficult grid connection, difficult partial roadway plugging and reconstruction of abandoned mines, underground space waste caused by rigid roadway plugging and the like, and can realize the purposes of peak clipping and valley filling of wind and light power generation and efficient utilization of the underground space of abandoned mines.
In order to achieve the above purpose, the invention provides a multi-chamber combined abandoned mine compressed air energy storage system, which comprises abandoned mine roadway space, an air inlet well communicating ground with the abandoned mine roadway space, an air outlet well communicating ground with the abandoned mine roadway space, a compressed air energy storage power station, a plurality of flexible air storage bags and a high-pressure air transmission pipeline;
the compressed air energy storage power station is installed on the ground and is close to the gas inlet well and the gas outlet well; an air compressor and a turbine generator are arranged in the compressed air energy storage power station;
the plurality of flexible air storage bags are sequentially arranged in the abandoned mine roadway space along the length direction, and the abandoned mine roadway space is divided into a plurality of roadway caverns and a plurality of combined air storage spaces with staggered flexible air storage bag installation spaces;
the high-pressure gas transmission pipeline is arranged in the roadway and comprises a transverse extension section extending in the roadway and two vertical extension sections extending in the gas inlet well and the gas outlet well respectively, the transverse extension sections sequentially penetrate through the flexible gas storage bags and are in sealing connection with the flexible gas storage bags, a plurality of pipeline outlets are sequentially arranged in the length direction of the transverse extension sections, the pipeline outlets are respectively positioned in the flexible gas storage bags and the roadway chambers, and electromagnetic valves are arranged at the pipeline outlets; two ends of the vertical extension section in the gas inlet well are respectively connected with the transverse extension section and the air compressor, and two ends of the vertical extension section in the gas outlet well are respectively connected with the transverse extension section and the turbine generator.
Further, in order to obtain the pressure value in the flexible air storage bag in real time, all be connected with pressure detection device A on every flexible air storage bag, pressure detection device A is used for the real-time detection pressure signal in the flexible air storage bag, in order to obtain the pressure value in the tunnel hole in real time, all is provided with pressure detection device B in every tunnel hole, pressure detection device B is used for the real-time detection pressure signal in the tunnel hole.
Further, for conveniently realizing automatic control, the system also comprises a control system, wherein the input end of the control system is respectively connected with the pressure detection device A and the pressure detection device B, and the output end of the control system is respectively connected with the electromagnetic valve, the air compressor and the turbine generator.
According to the invention, the plurality of flexible air storage bags are arranged in the space of the abandoned mine roadway space, and the whole roadway space can be isolated into a plurality of independent spaces by utilizing the plurality of inflated flexible air storage bags, so that not only can the air storage be carried out in the roadway cavern between the adjacent flexible air storage bags, but also the air storage can be carried out in the flexible air storage bags; the inflated flexible air storage bag can be used as a plugging device and can also be used as an air storage device at the same time, so that the dual utilization of the flexible air storage bag is realized, the plugging cost is reduced, the utilization rate of the roadway space is effectively improved, and the problems that the traditional plugging device occupies larger roadway space and can cause roadway space partition are avoided; the transverse extension section of the high-pressure gas transmission pipeline sequentially penetrates through the flexible gas storage bags, the pipeline outlets are arranged in the length direction of the transverse extension section, meanwhile, the pipeline outlets are utilized to establish connection between the transverse extension section and each roadway chamber and each flexible gas storage bag, electromagnetic valve ports are arranged at the positions of the pipeline outlets, gas storage and gas release processes of each flexible gas storage bag can be conveniently realized through the high-pressure gas transmission pipeline, the gas storage and gas release processes of each roadway chamber can be conveniently realized through the high-pressure gas transmission pipeline, and accordingly the gas storage processes and the gas release power generation processes are more portable. The scheme can greatly simplify the plugging construction process, can not thoroughly partition the roadway, has small occupied roadway space of the plugging part, can realize the efficient utilization of the space in the roadway, has strong universality and is convenient for large-area popularization and application.
The invention also provides a multi-chamber combined abandoned mine compressed air energy storage method, which comprises the following steps of;
step one: preparing;
selecting a abandoned mine meeting gas storage conditions, dividing and determining the position of a tunnel portal serving as a gas storage space and the mounting position of a flexible gas storage bag;
step two: reforming the gas storage space;
according to the divided flexible air storage bag installation positions, flexible air storage bags are installed in the waste mine roadway, the roadway is divided into space by the flexible air storage bags, and a plurality of roadway chambers and a plurality of flexible air storage bags are staggered multi-chamber combined air storage space;
step three: building a compressed air energy storage system;
constructing a compressed air energy storage power station on the ground, wherein an air compressor and a turbine generator are arranged in the compressed air energy storage power station;
the method comprises the steps that a high-pressure gas transmission pipeline is arranged in a roadway through a gas inlet well and a gas outlet well, connection between the high-pressure gas transmission pipeline and a compressed air energy storage power station is established, wherein the high-pressure gas transmission pipeline is provided with a transverse extension section extending in the roadway and a vertical extension section extending in the gas inlet well and the gas outlet well respectively, the transverse extension sections of the high-pressure gas transmission pipeline sequentially penetrate through a plurality of flexible gas storage bags, a plurality of pipeline outlets are arranged along the length direction of the flexible gas storage bags, and an electromagnetic valve is arranged at each pipeline outlet; simultaneously, a plurality of pipeline outlets are utilized to respectively establish communication channels between the high-pressure gas pipeline and each roadway chamber and each flexible gas storage bag;
step four: inflating the flexible gas storage bag and plugging a roadway;
s41: closing electromagnetic valves of the high-pressure gas transmission pipelines in all roadway holes, and opening the electromagnetic valves of the high-pressure gas transmission pipelines in all flexible gas storage bags;
s42: the air compressor is driven to work by using surplus wind power and surplus photoelectricity, compressed air is filled into each flexible air storage bag through a high-pressure air transmission pipeline in an air inlet well until the volume of the flexible air storage bag is fully expanded, the air in the flexible air storage bag reaches a set pressure, meanwhile, the outer side of the flexible air storage bag is fully attached to the wall surface of a roadway, the inner side of the flexible air storage bag is fully attached to the high-pressure air transmission pipeline, and then the fifth step is executed;
step five: storing gas in a tunnel chamber;
s51: closing electromagnetic valves of the high-pressure gas transmission pipeline in each flexible gas storage bag, and opening the electromagnetic valves of the high-pressure gas transmission pipeline in each tunnel hole;
s52: filling compressed air into each tunnel hole by using the surplus wind power and the surplus light, and closing electromagnetic valves of the high-pressure gas transmission pipeline in each tunnel hole when the air in the tunnel hole reaches a set pressure so as to jointly perform gas storage operation through the expanded flexible gas storage bags and the inflated tunnel holes;
step six: compressed air power generation;
s61: during the electricity consumption peak period, firstly, keeping the closing state of an electromagnetic valve of a high-pressure gas pipeline in each flexible gas storage bag, opening the electromagnetic valve of the high-pressure gas pipeline in each tunnel hole, releasing compressed air in the tunnel hole, enabling the compressed air to enter a compressed air energy storage power station through the high-pressure gas pipeline in a gas outlet well, driving a turbine generator in the compressed air energy storage power station to generate electricity, and executing S62 after the compressed air in each tunnel hole is released;
s62: firstly closing electromagnetic valves of the high-pressure gas transmission pipeline in each roadway hole, then opening the electromagnetic valves of the high-pressure gas transmission pipeline in each flexible gas storage bag, releasing compressed air in the flexible gas storage bag, continuously generating electricity by using the compressed air stored in each flexible gas storage bag, and executing the step seven after the compressed air in each flexible gas storage bag is released;
step seven: circulating charging and discharging operation of compressed air;
repeating the fourth to sixth steps, and repeating the cyclic charging and discharging operation of the waste mine compressed air.
Further, in order to ensure the volume of air energy storage and the power generation efficiency in the energy release process, in the first step, the available gas storage space of the abandoned mine is 3×10 5 m 3 The above.
Further, in order to ensure the plugging effect on the roadway and also to ensure the service life, in the second step, the gas storage pressure of the flexible gas storage bag is not lower than 10MPa.
In the fifth step, the set pressure of the air in the tunnel portal is 2-3 MPa lower than the set pressure of the air in the flexible air storage bag in order to avoid the situation that the flexible air storage bag is damaged due to the fact that the flexible air storage bag is excessively extruded by the excessive pressure in the tunnel portal.
Compared with the conventional method for rigidly plugging the roadway, the method fully combines the flexible air storage bag with the rigid air storage chamber, solves the problem of plugging the waste mine roadway, effectively improves the space utilization rate of the mine roadway, realizes the energy storage operation of the compressed air of the waste mine combined by multiple groves, and simultaneously effectively reduces the flowing distance of the air in the roadway, thereby reducing the air leakage and the heat loss. In addition, as the electromagnetic valves are arranged on the pipeline outlets in each roadway hole, the number of the gas storage roadway holes can be selectively started according to the requirements, and when the surplus wind power and the surplus light power are small, and particularly the surplus electric energy is insufficient to fill the whole roadway space with compressed air, only part of the roadway space can be used for storing energy, so that the flexibility and the applicability of the compressed air energy storage of the abandoned mine roadway can be greatly improved.
According to the invention, when the flexible air storage bag and the roadway cavern are used for storing the compressed air of the multiple caverns, the synergistic effect of the flexible air storage bag, the compressed air storage of the roadway caverns and the blocking can be fully exerted. When energy storage is carried out, compressed air is injected into the flexible air storage bag, so that the flexible air storage bag expands in volume along the length and the height direction of the roadway under the action of high-pressure air, and the flexible air storage bag is fully attached to the wall surface of the roadway and the high-pressure air transmission pipeline in the height direction of the roadway due to the limitation of the wall surface of the roadway, and in-situ forming sealing plug is formed, so that the effect of effectively sealing the roadway is achieved. In addition, the in-process of injecting compressed air into the tunnel portal chamber, the flexible air storage bag can generate compression deformation along the length direction of the tunnel under the action of high-pressure air in the tunnel portal chamber, so that the volume of the tunnel portal chamber can be increased, the expansion amount of the flexible air storage bag in the height direction of the tunnel can be further increased, and the plugging effect of the flexible air storage bag on the tunnel can be further enhanced. When the energy release power generation is carried out, firstly, the compressed air in the tunnel cavity is released, the pressure in the tunnel cavity is continuously reduced along with the continuous discharge of the compressed air in the tunnel cavity, and at the moment, the flexible air storage bag is expanded and deformed along the length direction of the tunnel under the action of the high-pressure air in the flexible air storage bag, so that the compressed air in the tunnel cavity can be effectively extruded, the discharge pressure of the compressed air in the tunnel cavity can be further improved, and the power generation efficiency can be further improved. Therefore, through the mode of the cooperative inflation energy storage of the roadway chamber and the flexible gas storage bag, the blocking effect of the abandoned roadway in the compressed air energy storage process is improved, the discharge pressure of the compressed air is obviously improved, and the reliability of the compressed air energy storage and the energy conversion efficiency of the abandoned mine are further improved on the basis of ensuring the full utilization of roadway space. The method has simple steps and low implementation cost, can solve the problems of strong fluctuation of wind and light power generation, difficult grid connection, difficult partial roadway plugging and reconstruction of abandoned mines, underground space waste caused by rigid roadway plugging and the like, and can realize the purposes of peak clipping and valley filling of wind and light power generation and efficient utilization of the underground space of abandoned mines.
Drawings
FIG. 1 is a schematic diagram of the division of a gas storage space in the method of the present invention;
FIG. 2 is a schematic illustration of the installation of a flexible reservoir bag in a method of the present invention;
FIG. 3 is a cross-sectional view taken in the direction A-A of FIG. 2;
FIG. 4 is a schematic diagram of the system of the present invention;
FIG. 5 is a cross-sectional view taken in the direction B-B of FIG. 4;
FIG. 6 is a schematic diagram of a flexible air storage bag inflation energy storage and roadway plugging process in the method of the invention;
FIG. 7 is a cross-sectional view taken along the direction C-C in FIG. 6;
FIG. 8 is a schematic diagram of the compressed air energy storage process in a tunnel cavity in the method of the present invention;
FIG. 9 is a schematic diagram of the compressed air energy-releasing power generation process in a roadway house in the method of the invention;
FIG. 10 is a schematic illustration of the compressed air energy release power generation process in a flexible air storage bag in the method of the present invention.
In the figure: 1. the device comprises a roadway chamber, a mounting position of a flexible air storage bag, a gas inlet well, a gas outlet well, a flexible air storage bag, a roadway wall surface, a high-pressure gas transmission pipeline, a pipeline outlet, a pipeline inlet, a pipeline outlet, a pipeline electromagnetic valve, a compressed air energy storage power station and compressed air.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 10, the invention provides a multi-chamber combined abandoned mine compressed air energy storage system, which comprises an abandoned mine tunnel space, an air inlet well 3 communicated with the ground and the abandoned mine tunnel space, an air outlet well 4 communicated with the ground and the abandoned mine tunnel space, a compressed air energy storage power station 10, a plurality of flexible air storage bags 5 and a high-pressure air transmission pipeline 7;
the compressed air energy storage power station 10 is installed on the ground and is close to the gas inlet well 3 and the gas outlet well 4; an air compressor and a turbine generator are arranged in the compressed air energy storage power station 10;
the plurality of flexible air storage bags 5 are sequentially arranged in the abandoned mine roadway space along the length direction, and divide the abandoned mine roadway space into a plurality of roadway caverns 1 and a plurality of combined air storage spaces with staggered flexible air storage bag installation spaces;
the high-pressure gas transmission pipeline 7 is arranged in a roadway and comprises a transverse extension section extending in the roadway and two vertical extension sections extending in the gas inlet well 3 and the gas outlet well 4 respectively, the transverse extension sections sequentially penetrate through the flexible gas storage bags 5 and are in sealing connection with the flexible gas storage bags 5, a plurality of pipeline outlets 8 are sequentially arranged in the length direction of the transverse extension sections, the pipeline outlets 8 are respectively positioned in the flexible gas storage bags 5 and the roadway chambers 1, and electromagnetic valves 9 are respectively arranged at the pipeline outlets 8; two ends of the vertical extension section in the gas inlet well 3 are respectively connected with the transverse extension section and the air compressor, and two ends of the vertical extension section in the gas outlet well 4 are respectively connected with the transverse extension section and the turbine generator.
In order to obtain the pressure value in the flexible air storage bag in real time, each flexible air storage bag 5 is connected with a pressure detection device A, the pressure detection device A is used for detecting the pressure signal in the flexible air storage bag 5 in real time, in order to obtain the pressure value in the tunnel portal chamber in real time, each tunnel portal chamber 1 is internally provided with a pressure detection device B, and the pressure detection device B is used for detecting the pressure signal in the tunnel portal chamber 1 in real time.
In order to conveniently realize automatic control, the system also comprises a control system, wherein the input end of the control system is respectively connected with the pressure detection device A and the pressure detection device B, and the output end of the control system is respectively connected with the electromagnetic valve 9, the air compressor and the turbine generator.
According to the invention, the plurality of flexible air storage bags are arranged in the space of the abandoned mine roadway space, and the whole roadway space can be isolated into a plurality of independent spaces by utilizing the plurality of inflated flexible air storage bags, so that not only can the air storage be carried out in the roadway cavern between the adjacent flexible air storage bags, but also the air storage can be carried out in the flexible air storage bags; the inflated flexible air storage bag can be used as a plugging device and can also be used as an air storage device at the same time, so that the dual utilization of the flexible air storage bag is realized, the plugging cost is reduced, the utilization rate of the roadway space is effectively improved, and the problems that the traditional plugging device occupies larger roadway space and can cause roadway space partition are avoided; the transverse extension section of the high-pressure gas transmission pipeline sequentially penetrates through the flexible gas storage bags, the pipeline outlets are arranged in the length direction of the transverse extension section, meanwhile, the pipeline outlets are utilized to establish connection between the transverse extension section and each roadway chamber and each flexible gas storage bag, electromagnetic valve ports are arranged at the positions of the pipeline outlets, gas storage and gas release processes of each flexible gas storage bag can be conveniently realized through the high-pressure gas transmission pipeline, the gas storage and gas release processes of each roadway chamber can be conveniently realized through the high-pressure gas transmission pipeline, and accordingly the gas storage processes and the gas release power generation processes are more portable. The scheme can greatly simplify the plugging construction process, can not thoroughly partition the roadway, has small occupied roadway space of the plugging part, can realize the efficient utilization of the space in the roadway, has strong universality and is convenient for large-area popularization and application.
The invention also provides a multi-chamber combined abandoned mine compressed air energy storage method, which comprises the steps of firstly reforming an abandoned mine roadway after the completion of mining, installing a flexible air storage bag at a position where roadway blocking is required, dividing the roadway space into a plurality of sections of air storage spaces through the flexible air storage bag, forming in-situ blocking after the flexible air storage bag stores high-pressure air, simultaneously playing roles of air storage and blocking, and jointly realizing the purpose of air storage and energy storage with the roadway space, thereby reducing the difficulty of roadway blocking and reforming, realizing the efficient utilization of space resources, and particularly comprising the following steps of;
step one: preparing;
selecting abandoned mines meeting gas storage conditions, dividing and determining the position of a roadway chamber 1 serving as a gas storage space and the mounting position 2 of a flexible gas storage bag as shown in fig. 1;
in order to ensure the volume of air energy storage and the power generation efficiency in the energy release process, the available gas storage space of the abandoned mine is 3 multiplied by 10 5 m 3 The above.
Step two: reforming the gas storage space;
according to the divided flexible air storage bag installation positions 2, flexible air storage bags 5 are installed in waste mine roadways, as shown in fig. 2 and 3, the roadway is divided into spaces by the flexible air storage bags 5, and a plurality of roadway chambers 1 and a plurality of flexible air storage bags 5 are staggered to form a multi-chamber combined air storage space; at this time, the flexible air storage bag 5 and the tunnel portal 1 form a plurality of groups of air storage spaces;
in order to ensure the blocking effect on the roadway and also in order to ensure the service life, the gas storage pressure of the flexible gas storage bag 5 is not lower than 10MPa.
Step three: building a compressed air energy storage system;
as shown in fig. 4 and 5, a compressed air energy storage power station 10 is constructed on the ground, wherein an air compressor and a turbine generator are arranged in the compressed air energy storage power station 10;
installing a high-pressure gas transmission pipeline 7 in a roadway through a gas inlet well 3 and a gas outlet well 4, and establishing connection between the high-pressure gas transmission pipeline 7 and a compressed air energy storage power station 10, wherein the high-pressure gas transmission pipeline 7 is provided with a transverse extension section extending in the roadway and a vertical extension section extending in the gas inlet well 3 and the gas outlet well 4 respectively, the transverse extension sections of the high-pressure gas transmission pipeline 7 sequentially penetrate through a plurality of flexible gas storage bags 5, a plurality of pipeline outlets 8 are arranged along the length direction of the flexible gas storage bags, and an electromagnetic valve 9 is installed at each pipeline outlet 8; simultaneously, a plurality of pipeline outlets 8 are utilized to respectively establish communication channels between the high-pressure gas pipeline 7 and each roadway chamber 1 and each flexible gas storage bag 5;
as a preferable mode, the opening and closing of each electromagnetic valve 9 can be automatically controlled through a controller positioned on the ground, so that the operation of filling and discharging compressed air in the corresponding air storage space can be carried out;
step four: inflating the flexible gas storage bag and plugging a roadway;
s41: closing electromagnetic valves 9 of the high-pressure gas pipelines 7 in the various roadway chambers 1, and opening the electromagnetic valves 9 of the high-pressure gas pipelines 7 in the various flexible gas storage bags 5;
s42: the air compressor is driven to work by using surplus wind power and surplus photoelectricity, compressed air 11 is filled into each flexible air storage bag 5 through a high-pressure air transmission pipeline 7 in the air inlet well 3 until the volume of the flexible air storage bag 5 is fully expanded, the air in the flexible air storage bag 5 reaches the set pressure, meanwhile, the outer side of the flexible air storage bag 5 is fully attached to a roadway wall 6, the inner side of the flexible air storage bag 5 is fully attached to the high-pressure air transmission pipeline 7, so that an in-situ forming sealing plug can be formed, an effective sealing effect can be achieved, and then the fifth step is executed; the process can convert surplus electric energy into air pressure energy, as shown in fig. 6 and 7;
step five: storing gas in a tunnel chamber;
s51: closing electromagnetic valves 9 of the high-pressure gas pipelines 7 in the flexible gas storage bags 5, and opening the electromagnetic valves 9 of the high-pressure gas pipelines 7 in the roadway chambers 1;
s52: filling compressed air 11 into each roadway and cavern 1 by using the surplus wind power and the surplus light, and closing electromagnetic valves 9 of the high-pressure gas transmission pipeline 7 in each roadway and cavern 1 when the air in the roadway and cavern 1 reaches a set pressure so as to jointly perform gas storage operation through the expanded flexible gas storage bags 5 and the inflated roadway and caverns 1, as shown in fig. 8;
in order to avoid the situation that the flexible gas storage bag is damaged due to the fact that the flexible gas storage bag is excessively extruded by the excessive pressure in the tunnel portal chamber, the set pressure of air in the tunnel portal chamber 1 is 2-3 MPa lower than that of air in the flexible gas storage bag 5.
Step six: compressed air power generation;
s61: during the electricity utilization peak period, as shown in fig. 9, firstly, keeping the high-pressure gas transmission pipeline 7 in the closed state of the electromagnetic valve 9 in each flexible gas storage bag 5, opening the electromagnetic valve 9 of the high-pressure gas transmission pipeline 7 in each tunnel and cavern 1, releasing the compressed air 11 in the tunnel and cavern 1, enabling the compressed air 11 to enter the compressed air energy storage power station 10 through the high-pressure gas transmission pipeline 7 in the gas outlet well 4, driving the turbine generator in the compressed air energy storage power station 10 to generate electricity, and executing S62 after the compressed air 11 in each tunnel and cavern 1 is released;
s62: as shown in fig. 10, the electromagnetic valves 9 of the high-pressure gas pipelines 7 in the tunnel chambers 1 are closed firstly, then the electromagnetic valves 9 of the high-pressure gas pipelines 7 in the flexible gas storage bags 5 are opened, the compressed air 11 in the flexible gas storage bags 5 is released, the compressed air 11 stored in the flexible gas storage bags 5 is utilized to continue to generate electricity, and the seventh step is executed after the compressed air 11 in the flexible gas storage bags 5 is released;
step seven: circulating charging and discharging operation of compressed air;
and step four to step six are repeated, and the cyclic charging and discharging operation of the abandoned mine compressed air is repeated, so that the fluctuation of wind and light power generation is stabilized, and the peak clipping and valley filling of a power grid are realized.
Compared with the conventional method for rigidly plugging the roadway, the method fully combines the flexible air storage bag with the rigid air storage chamber, solves the problem of plugging the waste mine roadway, effectively improves the space utilization rate of the mine roadway, realizes the energy storage operation of the compressed air of the waste mine combined by multiple groves, and simultaneously effectively reduces the flowing distance of the air in the roadway, thereby reducing the air leakage and the heat loss. In addition, as the electromagnetic valves are arranged on the pipeline outlets in each roadway hole, the number of the gas storage roadway holes can be selectively started according to the requirements, and when the surplus wind power and the surplus light power are small, and particularly the surplus electric energy is insufficient to fill the whole roadway space with compressed air, only part of the roadway space can be used for storing energy, so that the flexibility and the applicability of the compressed air energy storage of the abandoned mine roadway can be greatly improved.
According to the invention, when the flexible air storage bag and the roadway cavern are used for storing the compressed air of the multiple caverns, the synergistic effect of the flexible air storage bag, the compressed air storage of the roadway caverns and the blocking can be fully exerted. When energy storage is carried out, compressed air is injected into the flexible air storage bag, so that the flexible air storage bag expands in volume along the length and the height direction of the roadway under the action of high-pressure air, and the flexible air storage bag is fully attached to the wall surface of the roadway and the high-pressure air transmission pipeline in the height direction of the roadway due to the limitation of the wall surface of the roadway, and in-situ forming sealing plug is formed, so that the effect of effectively sealing the roadway is achieved. In addition, the in-process of injecting compressed air into the tunnel portal chamber, the flexible air storage bag can generate compression deformation along the length direction of the tunnel under the action of high-pressure air in the tunnel portal chamber, so that the volume of the tunnel portal chamber can be increased, the expansion amount of the flexible air storage bag in the height direction of the tunnel can be further increased, and the plugging effect of the flexible air storage bag on the tunnel can be further enhanced. When the energy release power generation is carried out, firstly, the compressed air in the tunnel cavity is released, the pressure in the tunnel cavity is continuously reduced along with the continuous discharge of the compressed air in the tunnel cavity, and at the moment, the flexible air storage bag is expanded and deformed along the length direction of the tunnel under the action of the high-pressure air in the flexible air storage bag, so that the compressed air in the tunnel cavity can be effectively extruded, and the discharge pressure of the compressed air in the tunnel cavity can be further improved. Therefore, through the mode of the cooperative inflation energy storage of the roadway chamber and the flexible gas storage bag, the blocking effect of the abandoned roadway in the compressed air energy storage process is improved, the discharge pressure of the compressed air is obviously improved, and the reliability of the compressed air energy storage and the energy conversion efficiency of the abandoned mine are further improved on the basis of ensuring the full utilization of roadway space.
Claims (4)
1. A multi-cavity combined abandoned mine compressed air energy storage method adopts a multi-cavity combined abandoned mine compressed air energy storage system, and the multi-cavity combined abandoned mine compressed air energy storage system comprises an abandoned mine roadway space, an air inlet well (3) communicated with the ground and the abandoned mine roadway space, an air outlet well (4) communicated with the ground and the abandoned mine roadway space, a compressed air energy storage power station (10), a plurality of flexible air storage bags (5) and a high-pressure air transmission pipeline (7);
the compressed air energy storage power station (10) is installed on the ground and is close to the gas inlet well (3) and the gas outlet well (4); an air compressor and a turbine generator are arranged in the compressed air energy storage power station (10);
the plurality of flexible air storage bags (5) are sequentially arranged in the abandoned mine roadway space along the length direction, and divide the abandoned mine roadway space into a plurality of roadway chambers (1) and a plurality of combined air storage spaces with staggered flexible air storage bag installation spaces;
the high-pressure gas transmission pipeline (7) is arranged in a roadway and comprises a transverse extension section extending in the roadway and two vertical extension sections extending in an air inlet well (3) and an air outlet well (4) respectively, the transverse extension sections sequentially penetrate through a plurality of flexible gas storage bags (5) and are in sealing connection with the flexible gas storage bags (5), a plurality of pipeline outlets (8) are sequentially arranged in the length direction of the transverse extension sections, the pipeline outlets (8) are respectively positioned in the flexible gas storage bags (5) and the roadway caverns (1), and electromagnetic valves (9) are arranged at the positions of the pipeline outlets (8); two ends of the vertical extension section in the gas inlet well (3) are respectively connected with the transverse extension section and the air compressor, and two ends of the vertical extension section in the gas outlet well (4) are respectively connected with the transverse extension section and the turbine generator;
each flexible air storage bag (5) is connected with a pressure detection device A, the pressure detection devices A are used for detecting pressure signals in the flexible air storage bags (5) in real time, each roadway chamber (1) is internally provided with a pressure detection device B, and the pressure detection devices B are used for detecting pressure signals in the roadway chamber (1) in real time;
the system also comprises a control system, wherein the input end of the control system is respectively connected with the pressure detection device A and the pressure detection device B, and the output end of the control system is respectively connected with the electromagnetic valve (9), the air compressor and the turbine generator;
the method is characterized by comprising the following steps of;
step one: preparing;
selecting a abandoned mine meeting gas storage conditions, dividing and determining the position of a tunnel portal (1) serving as a gas storage space and the mounting position (2) of a flexible gas storage bag;
step two: reforming the gas storage space;
according to the divided flexible air storage bag installation positions (2), flexible air storage bags (5) are installed in the waste mine roadway, the roadway is divided into space by the flexible air storage bags (5), and a plurality of roadway chambers (1) and a plurality of flexible air storage bags (5) are staggered to form a multi-chamber combined air storage space;
step three: building a compressed air energy storage system;
constructing a compressed air energy storage power station (10) on the ground, wherein an air compressor and a turbine generator are arranged in the compressed air energy storage power station (10);
installing a high-pressure gas transmission pipeline (7) in a roadway through a gas inlet well (3) and a gas outlet well (4), and establishing connection between the high-pressure gas transmission pipeline (7) and a compressed air energy storage power station (10), wherein the high-pressure gas transmission pipeline (7) is provided with a transverse extension section extending in the roadway and a vertical extension section extending in the gas inlet well (3) and the gas outlet well (4) respectively, the transverse extension sections of the high-pressure gas transmission pipeline (7) sequentially penetrate through a plurality of flexible gas storage bags (5), a plurality of pipeline outlets (8) are arranged along the length direction of the high-pressure gas transmission pipeline, and an electromagnetic valve (9) is installed at each pipeline outlet (8); simultaneously, a plurality of pipeline outlets (8) are utilized to respectively establish communication channels between the high-pressure gas pipeline (7) and each roadway chamber (1) and each flexible gas storage bag (5);
step four: inflating the flexible gas storage bag and plugging a roadway;
s41: closing electromagnetic valves (9) of the high-pressure gas pipelines (7) in each roadway chamber (1), and opening the electromagnetic valves (9) of the high-pressure gas pipelines (7) in each flexible gas storage bag (5);
s42: the air compressor is driven to work by utilizing surplus wind power and surplus photoelectricity, compressed air (11) is filled into each flexible air storage bag (5) through a high-pressure air transmission pipeline (7) in the air inlet well (3) until the volume of the flexible air storage bags (5) is fully expanded, the air in the flexible air storage bags (5) reaches a set pressure, meanwhile, the outer sides of the flexible air storage bags (5) are fully attached to a roadway wall surface (6), the inner sides of the flexible air storage bags (5) are fully attached to the high-pressure air transmission pipeline (7), and then a fifth step is executed;
step five: storing gas in a tunnel chamber;
s51: closing electromagnetic valves (9) of the high-pressure gas pipelines (7) in the flexible gas storage bags (5), and opening the electromagnetic valves (9) of the high-pressure gas pipelines (7) in the roadway chambers (1);
s52: filling compressed air (11) into each tunnel and cavern (1) by using the surplus wind power and the surplus light, and closing electromagnetic valves (9) of the high-pressure gas transmission pipeline (7) in each tunnel and cavern (1) when the air in the tunnel and cavern (1) reaches a set pressure so as to jointly perform gas storage operation through the expanded flexible gas storage bags (5) and the inflated tunnel and caverns (1);
step six: compressed air power generation;
s61: during the electricity consumption peak period, firstly, keeping the closing state of an electromagnetic valve (9) of a high-pressure gas pipeline (7) in each flexible gas storage bag (5), opening the electromagnetic valve (9) of the high-pressure gas pipeline (7) in each tunnel portal (1), releasing compressed air (11) in the tunnel portal (1), enabling the compressed air (11) to enter a compressed air energy storage power station (10) through the high-pressure gas pipeline (7) in a gas outlet well (4), driving a turbine generator in the compressed air energy storage power station (10) to generate electricity, and executing S62 after the compressed air (11) in each tunnel portal (1) is released;
s62: firstly closing electromagnetic valves (9) of the high-pressure gas transmission pipelines (7) in each roadway cavern (1), then opening the electromagnetic valves (9) of the high-pressure gas transmission pipelines (7) in each flexible gas storage bag (5), releasing the compressed air (11) in the flexible gas storage bags (5), continuing to generate electricity by utilizing the compressed air (11) stored in each flexible gas storage bag (5), and executing the step seven after the compressed air (11) in each flexible gas storage bag (5) is released;
step seven: circulating charging and discharging operation of compressed air;
repeating the fourth to sixth steps, and repeating the cyclic charging and discharging operation of the waste mine compressed air.
2. The method for storing compressed air in a multi-chamber combined abandoned mine according to claim 1, wherein in the first step, the available air storage space of the abandoned mine is 3 x 10 5 m 3 The above.
3. The multi-chamber combined abandoned mine compressed air energy storage method according to claim 2, wherein in the second step, the gas storage pressure of the flexible gas storage bag (5) is not lower than 10MPa.
4. The method for storing the compressed air in the abandoned mine combined with the multiple chambers according to claim 3, wherein in the fifth step, the set pressure of the air in the tunnel chamber (1) is 2-3 MPa lower than the set pressure of the air in the flexible air storage bag (5).
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| US4282444A (en) * | 1979-03-21 | 1981-08-04 | Ramer James L | Method for deep shaft pumpback energy generation |
| DE202013001987U1 (en) * | 2013-02-28 | 2013-04-24 | Friedrich Gütlhuber | Gas storage system |
| CN108916105B (en) * | 2018-07-09 | 2020-12-29 | 中国矿业大学 | Constant-pressure compressed air energy storage device |
| CN108895017B (en) * | 2018-07-09 | 2021-01-26 | 中国矿业大学 | Multistage constant voltage compressed air energy memory |
| CN110057121B (en) * | 2019-04-24 | 2020-01-14 | 中国矿业大学 | Method and device for efficient air compression energy storage by utilizing waste underground coal mine terrestrial heat |
| CN113882900B (en) * | 2021-09-28 | 2024-05-10 | 宁波大学 | Natural water seal compressed air energy storage system for manually excavating underground cavern under lake |
| CN216811786U (en) * | 2021-10-29 | 2022-06-24 | 势加透博（上海）能源科技有限公司 | Compressed air energy storage system |
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