CN117672068B - Abandoned mine water storage and energy storage experimental system and experimental method thereof - Google Patents
Abandoned mine water storage and energy storage experimental system and experimental method thereof Download PDFInfo
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- 238000002474 experimental method Methods 0.000 title claims abstract description 37
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Abstract
The invention discloses a waste mine water storage and energy storage experimental system and an experimental method thereof, wherein the experimental system comprises the following steps: the water bath box seals the box body and is used for simulating the stratum temperature; the underground chamber simulation component is provided with an air inlet well simulation pipeline, an air return well simulation pipeline, a roadway simulation pipeline and a goaf simulation box with broken stones inside; the water storage and pumping component is provided with a water injection tank for simulating water storage temperature and a pipe assembly, one end of which is movably positioned in a simulated pipeline of the air inlet well and used for storing water and pumping water; the monitoring component is provided with a temperature monitor, a flow monitor and a water pressure monitor which are connected with the controller; according to the invention, the water bath tank is used for simulating the stratum temperature, the underground chamber simulation component is used for simulating the structures of an underground roadway, an air inlet well, an air return well and a goaf, the water storage and pumping component is used for simulating different water storage and pumping working conditions, the simulation of the abandoned mine water storage and energy storage experimental system is realized, the reliability and the accuracy of the calculation result are higher, and experimental data support is provided for abandoned mine water storage and energy storage.
Description
Technical Field
The invention relates to an energy storage experimental technology, belongs to the field of mine energy storage utilization, and in particular relates to a waste mine water storage and energy storage experimental system and an experimental method thereof.
Background
Most of abandoned mines are closed because mining activities are not performed due to resource exhaustion, excessive mining cost, huge potential safety hazards and the like; proper management and disposal, such as filling, sealing, monitoring, are required for abandoned mines; the waste mine contains abundant mine water resources, geothermal resources and space resources, and the available energy resources in the waste mine are reasonably utilized and developed, so that the continuous water resource supply can be provided, the dependence on the traditional energy sources is reduced, the environmental impact is reduced, and the method has important significance for economic development and environmental protection;
The waste mine water storage and energy storage is an effective mode of utilizing the waste mine, namely, on one hand, the waste mine space is utilized to store water resources in the underground mine space, energy storage mine water is formed after heat exchange with a rock mass with a temperature difference between the underground mine water and the water resources for a certain time and is stored in the underground mine, the energy storage mine water is extracted to the ground for social production and living after a certain time, on the other hand, ground power resources can be temporarily stored on the ground through potential energy conversion with the water resources, and the water resources are stored in the mine to realize energy conversion when electricity is needed;
The key point of the waste mine water storage and energy storage lies in the water storage capacity and the energy storage heat exchange efficiency, and the data such as the temperature, the water pressure and the flow rate of the underground chamber are monitored, but as the underground chamber is often scrapped for a long time, the surrounding rock has poor supporting capability or has lost supporting capability, part of the position is filled with toxic and harmful gases such as acid mine water, gas and the like, and the monitoring data from the on-site in-situ scale arrangement equipment has great challenges and extremely high economic maintenance cost, so the current research method is mainly limited to numerical simulation and theoretical calculation and lacks the simulation of a waste mine water storage and energy storage experimental system;
At present, numerical simulation and theoretical calculation have the problem that the actual mine situation is simplified to cause deviation between a simulation result and the actual situation, namely, the experiment and the on-site data support are lacked, for example, the situation that the abandoned mine space or the caving area caused by excavation of the abandoned mine cavity is completely filled with water resources is often assumed, the area incapable of being filled in the actual process is ignored, and the study on the water storage state in the water storage and pumping process is lacked; for example, when calculating energy storage and heat transfer efficiency, it is also assumed that the water storage resources are in complete contact with the wall surface of the underground chamber, however, in the actual energy storage process, frequent water storage and production can make the underground space full of a large amount of gas, and it is difficult to realize complete filling of the underground space by the water resources during each water production cycle.
Disclosure of Invention
The invention aims to provide a water storage and energy storage experimental system for a abandoned mine, which has a simple and compact structure, monitors the temperature, flow and pressure during water storage and pumping in the abandoned mine, realizes simulation of different experiments in the water storage and pumping state, has higher reliability and accuracy of calculation results, provides support for water storage and energy storage of the abandoned mine, and avoids the lack of data support of experiments and sites due to the fact that numerical simulation and theoretical calculation are adopted in the prior art.
In order to achieve the above purpose, the waste mine water storage and energy storage experimental system comprises:
the water bath box seals the box body and is used for simulating the stratum temperature;
the underground chamber simulation component is provided with an air inlet well simulation pipeline, an air return well simulation pipeline, a roadway simulation pipeline and a goaf simulation box with broken stones inside;
One end of the air inlet well simulation pipeline is fixed on the water injection tank, and the other end of the air inlet well simulation pipeline is connected with a plurality of roadway simulation pipelines; each roadway simulation pipeline is connected with a corresponding goaf simulation box, and a water permeable pad is arranged at the joint; the goaf simulation box is hung in the water bath box at different angles and positions;
one end of the return air well simulation pipeline is connected with the goaf simulation box;
The water storage and pumping component is provided with a water injection tank for simulating water storage temperature and a pipe assembly, one end of which is movably positioned in a simulated pipeline of the air inlet well and used for storing water and pumping water;
The other ends of the water injection tank and the return air well simulation pipeline are subjected to height adjustment through the lifting assembly;
the monitoring component is provided with a temperature monitor, a flow monitor and a water pressure monitor which are connected with the controller;
The temperature monitors are arranged on the water bath tank, the water injection tank and the underground chamber simulation component and are used for monitoring water temperatures at different positions; the flow monitor is arranged on the pipe assembly and is used for monitoring the flow of water storage and pumping; the hydraulic pressure monitor is arranged on the underground chamber simulation component and is used for monitoring the hydraulic pressures at different positions.
Further, the pipe assembly is provided with a water storage pipe, a water suction pipe, a three-way electromagnetic valve controlled by a controller and a vacuum pump;
one end of the water storage pipe is positioned in the air inlet well simulation pipeline, and the other end of the water storage pipe is communicated with the water injection tank after passing through the three-way electromagnetic valve;
the other port of the three-way electromagnetic valve is back flowed into the water injection tank through a water pumping pipe, and a vacuum pump is arranged on the water pumping pipe.
Further, the middle part of the goaf simulation box is positioned at the lower end of the telescopic bracket through adjusting the angle of the support;
The adjusting support is a spherical hinge structure with a damping structure;
The upper end of the telescopic bracket is arranged on the inner side of a transparent cover plate on the upper part of the water bath box.
Further, the adjusting support is provided with a ball rod arranged on the goaf simulating box and a support seat positioned at the lower end of the telescopic support;
The support seat is provided with a blind hole for placing a spring and an adjusting screw rod which is installed in a threaded manner;
The ball head of the ball rod is rotatably positioned in the supporting seat, and the spring is extruded and acted on the ball head under the action of the adjusting screw.
Further, a plurality of transverse guide rails and longitudinal guide rails are arranged on the inner side of the transparent cover plate;
The cross sections of the transverse guide rail and the longitudinal guide rail are sliding grooves with T-shaped structures; the supporting blocks at the upper end of the telescopic bracket are matched and slide in the transverse guide rail or the longitudinal guide rail.
Further, a plurality of internal threaded holes are formed in the inner side of the transparent cover plate;
the supporting block at the upper end of the telescopic bracket is in threaded installation with the internal threaded hole.
Further, the broken stone is a sandstone fragment, and phenolphthalein liquid is smeared outside the broken stone;
the water injection tank is internally provided with an acidic water storage solution; one side of the water bath box is a transparent plate, and a camera for recording the color-changing distribution characteristics of the broken stone under different water storage parameter conditions is arranged on the corresponding outer side.
Further, the lifting assembly is provided with a hanging rod which is vertically arranged, a pulley which is rotatably arranged at the upper end of the hanging rod and a hanging rope;
one end of the lifting rope is connected with the return air well simulation pipeline or the water injection tank, and the other end of the lifting rope is wound on the outer side of the pulley and then connected to the suspender.
The invention also aims to provide an experimental method for storing and storing water in the abandoned mine, which is used for simulating the stratum temperature through the water bath box, the underground chamber simulation component is used for simulating the structures of an underground roadway, an air inlet well, an air return well and a goaf, the water storage and pumping component is used for simulating different water storage and pumping working conditions, the temperature monitor, the water pressure monitor and the flow monitor in the monitoring component correspondingly monitor the temperature, the water pressure and the flow of different places, so that the simulation of the experimental system for storing and storing water in the abandoned mine is realized, the reliability and the accuracy of the calculation result are higher, and experimental data support is provided for storing and storing water in the abandoned mine.
The waste mine water storage and energy storage experimental method specifically comprises the following steps:
s1, cleaning and drying a downhole chamber simulation component and a water storage and pumping component, smearing a litmus solution on broken stone in a goaf simulation box, and drying;
s2, analyzing geological information of abandoned mine production, determining the size, space geometric position and chamber damage condition of each mining chamber of the mine, and arranging underground chamber simulation components, wherein the underground chamber simulation components comprise the size, position and angle of goaf simulation boxes and the grading and quantity of internal broken stones; simulating the height and angle of a pipeline in a roadway;
Installing a temperature monitor, a flow monitor and a water pressure monitor in the monitoring component to monitor the temperature, the flow and the water pressure of different positions and transmitting the monitored real-time data to the controller;
S3, storing the meta-acid solution in a water injection tank;
the lifting assembly lifts the other ends of the water injection tank and the return air well simulation pipeline to a proper position, and records that the average height difference between the water bath tank and the roadway simulation pipeline is h;
s4, when water storage is carried out, the three-way electromagnetic valve is started to achieve the target flow velocity Time isPerforming water storage simulation of the abandoned mine for the first time, and monitoring the water pressure, the temperature and the flow rate of each monitoring point in real time;
The calculation formula of the real-time water storage is:
；
the water in the water injection tank enters a plurality of roadway simulation pipelines and corresponding goaf simulation boxes from the pipe assembly, when the acidic water storage solution contacts with crushed stone in the goaf simulation boxes, the crushed stone becomes red, and the color change distribution characteristics of the crushed stone under the condition of different water storage parameters are recorded through a camera;
when the water storage pressure of the roadway simulation pipeline meets After stopping water storage, after stabilizing for a certain time, the controller controls the port of the three-way electromagnetic valve positioned on the water suction pipe to be opened, and then the target flow rate is theTime isPerforming pumping simulation on waste mines for the first time, and recording the water pressure, water temperature and flow rate of each monitoring point in the pumping process;
The calculation formula of the real-time water pumping amount is as follows:
s5, when a simulation experiment of the waste mine pumped storage power station is carried out, the water bath box before water storage is kept dry;
the calculation formula of the real-time potential energy reduction of the waste mine water storage capacity is as follows:
wherein, For the density of water in the water filling tank (50) in the water storage processGravitational acceleration;
the calculation formula for generating electric energy in real time by water storage is as follows:
wherein, The conversion rate of gravitational potential energy and electric energy in the water storage process is used;
The calculation formula of the real-time potential energy increment of the waste mine water pumping amount is as follows:
the calculation formula of the pumping consumption electric energy is as follows:
wherein, The ratio of the pumping electricity consumption to the potential energy increment of water in the pumping process is calculated;
The calculation formula of the energy storage efficiency of the abandoned mine water storage is as follows:
When the waste mine water storage heat storage/cold experiment is simulated, tap water is fully stored in the water bath tank before water storage, and the water bath tank temperature and the water injection tank temperature are correspondingly simulated according to a certain temperature change;
The calculation formula of the real-time water storage heat/cold quantity of the abandoned mine is as follows:
wherein, Gravitational acceleration; /(I)、Time/>, respectivelyCorresponding temperature isSpecific heat capacity and density of water in the water injection tank;
the calculation formula of the real-time pumping heat/cold quantity of the abandoned mine is as follows:
wherein, 、RespectivelyThe time-dependent temperature isSpecific heat capacity and density of water in the water injection tank;
the calculation formula of the heat/cold energy of the waste mine water storage volume after being utilized in the environment of the water pumping time period is as follows:
The calculation formula of the heat/cold energy of the waste mine water pumping volume after being utilized in the environment of the water pumping time period is as follows:
wherein, The average air temperature in the local season when the waste mine heat/cold energy is utilized after water pumping;
The average water specific heat capacity in the local season when the waste mine heat/cold energy is utilized after water pumping;
the average water density in the local season when the waste mine heat/cold energy is utilized after water pumping;
The calculation formula of the available heat/cold energy of the waste mine water storage capacity in the water pumping time period environment is as follows:
the calculation formula of the available heat/cold energy of the waste mine water pumping quantity in the water pumping time period environment is as follows:
the calculation formula of the water storage efficiency of the abandoned mine is as follows:
the calculation formula of the water storage and energy storage efficiency of the abandoned mine is as follows:
The calculation formula of the utilization efficiency of the water storage and energy storage of the abandoned mine is as follows:
When the characteristic experiment of the change of the water pressure, the flow rate and the temperature in the underground chamber in the process of storing and storing the water in the abandoned mine is simulated, tap water is fully stored in the water bath tank before storing the water, and the temperature of the water bath tank and the temperature of the water injection tank correspondingly simulate the formation temperature and the initial temperature of storing the water according to certain temperature changes;
The temperature of the wind well simulation pipeline is The water pressure isThe simulated pipeline temperature of the return air well isThe water pressure isRoadway simulation pipeline temperature isThe water pressure isGoaf simulation box temperature isThe water pressure is；
Acquiring the measured temperature, water pressure and flow rate to obtain a variation characteristic observation experiment of the water pressure, the flow rate and the temperature in the underground chamber in the process of storing water and energy of the abandoned mine;
s6, repeating the steps S1-S5, and completing multiple simulation experiments under multiple circulation;
And S7, when the variation characteristic experiment of the water pressure, the flow rate and the temperature in the underground chamber in the water storage and energy storage process of the abandoned mine is simulated, all the liquid in the water bath tank, the water injection tank and the underground chamber simulation component is discharged, the temperature and the water injection flow rate in the water injection tank are changed, and the steps S1-S6 are repeated, so that the variation characteristic observation experiment of the water pressure, the flow rate and the temperature in the underground chamber in the water storage and energy storage process of the abandoned mine under the conditions of different water injection temperatures and water injection flow rates is completed.
Further, in step S5, the temperature of the water bath box is simulated at the target stratum temperature at +5 ℃/h or-5 ℃/h, and the water bath box is kept at a constant temperature for one hour;
the water injection tank temperature is simulated at the target water storage initial temperature with the temperature change of +5 ℃/h or-5 ℃/h, and the water injection tank is kept at the constant temperature for one hour.
Compared with the prior art, the waste mine water storage and energy storage experimental system is used for simulating formation temperature through the water bath box, the underground chamber simulation component is used for simulating structures of underground roadways, the air inlet well, the air return well and the goaf, the water storage and pumping component is used for simulating different water storage and pumping working conditions, the temperature monitor, the water pressure monitor and the flow monitor in the monitoring component correspondingly monitor temperatures, water pressures and flows at different places, simulation of the waste mine water storage and energy storage experimental system is realized, the reliability and accuracy of calculation results are higher, and experimental data support is provided for waste mine water storage and energy storage;
By monitoring the flow in the water storage and pumping states and simulating the corresponding temperature and water pressure, the experimental simulation of the waste mine pumped storage power station, the experimental simulation of the waste mine water storage heat storage/cold, and the experimental simulation of the change characteristics of the water pressure, the flow rate and the temperature in the underground chamber in the water storage and energy storage process are realized, so that the lack of experiments and on-site data support in the traditional method is avoided;
The water storage pipe is connected between the water injection tank and the goaf simulation box, one end of the water storage pipe is movably positioned in the air inlet well simulation pipeline, and the influence of different water storage points on water storage and energy storage can be simulated by changing the position of the tail end of the pipe assembly in the air inlet well simulation pipeline or the roadway simulation pipeline; in addition, the meta-acid solution is stored in a water injection tank, the litmus solution is smeared on the broken stone in the goaf simulation box, and when water in the water injection tank enters a plurality of roadway simulation pipelines from a pipe assembly and contacts with the broken stone in the corresponding goaf simulation box, the broken stone becomes red, and the color change distribution characteristics of the broken stone under the condition of different water storage parameters are recorded through a camera.
Drawings
FIG. 1 is an overall schematic of the present invention;
FIG. 2 is a schematic diagram of a downhole chamber simulation component of the present invention;
FIG. 3 is a schematic view of a water holding and pumping unit according to the present invention;
FIG. 4 is a bottom view of the assembled cross rail and longitudinal rail of the present invention;
FIG. 5 is a left side view of the transverse rail and longitudinal rail assembly of the present invention;
FIG. 6 is a schematic view of an adjustment support of the present invention;
FIG. 7 is a schematic view of the interior of the goaf simulation cartridge of the present invention;
In the figure: 10. the water bath box comprises a water bath box body 11, a first heater 12, a first condenser 13, a transparent cover plate 131, a first opening 132, a second opening 14, a transverse guide rail 15, a longitudinal guide rail 16, a telescopic bracket 17, an adjusting support seat 171, a ball rod 172, a supporting seat 173, an adjusting screw rod 174 and a spring; 18. a support block;
21. The air inlet well simulation pipeline comprises an air inlet well simulation pipeline body 22, a water storage pipe body 23, a pipeline connector 24, a roadway simulation pipeline body 25 and an air return well simulation pipeline body;
30. Goaf simulation box 31, broken stone 32 and water permeable pad;
41. Boom, 42, lifting rope, 43, pulley;
50. a water injection tank 51, a second heater 52, a second condenser 53, a vacuum pump 54 and a water pumping pipe;
61. a temperature monitor 62, a flow monitor 63, a water pressure monitor;
70. And a controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1,2,3 and 7, the water storage and energy storage experimental system for a abandoned mine comprises:
a water bath 10 sealing the tank and for simulating the formation temperature;
A downhole chamber simulation member having an air inlet well simulation pipe 21, an air return well simulation pipe 25, a roadway simulation pipe 24, and a goaf simulation box 30 having a crushed stone 31 therein;
one end of the air inlet well simulation pipeline 21 is fixed on the water injection tank 50, and the other end is connected with a plurality of roadway simulation pipelines 24; each roadway simulation pipeline 24 is connected with a corresponding goaf simulation box 30, and a water permeable gasket 32 is arranged at the connection part; the goaf simulation box 30 is suspended inside the water bath 10 at different angles and positions;
One end of the return air well simulation pipeline 25 is connected with a goaf simulation box 30;
a water storage and pumping part having a water injection tank 50 simulating a water storage temperature and a pipe assembly having one end moved to be positioned in the air inlet well simulation pipe 21 for water storage and pumping;
the other ends of the water injection tank 50 and the return air well simulation pipeline 25 are respectively subjected to height adjustment through a lifting assembly;
A monitoring unit having a temperature monitor 61, a flow monitor 62, and a water pressure monitor 63 connected to the controller 70;
The temperature monitor 61 is arranged on the water bath tank 10, the water filling tank 50 and the underground chamber simulation component and is used for monitoring the water temperatures at different positions; a flow monitor 62 is provided on the pipe assembly for monitoring the flow of the water stored and pumped; the water pressure monitor 63 is arranged on the underground chamber simulation component and is used for monitoring water pressures at different positions;
Specifically, the water bath 10 is used for simulating the formation temperature, and a first heater 11 and a first condenser 12 connected with the controller 70 are arranged in the water bath 10, namely, the first heater 11 is used for rapidly increasing the temperature in the water bath 10, the first condenser 12 is used for reducing the temperature in the water bath 10, and the first heater 11 and the first condenser 12 can be arranged at the bottom of the water bath 10 and are subjected to sealing treatment;
The water bath box 10 can be a cubic box body with the length of 100cm, the width of 100cm and the height of 50cm, which is formed by mutually bonding acrylic transparent plates through acrylic shadowless glue, and the outer sides of the strip edges of the water bath box 10 can be wrapped by a frame made of angle steel V to ensure the integral tightness; the transparent cover plate 13 at the upper part of the water bath tank 10 can be an acrylic transparent plate and is detachably installed, for example, the transparent cover plate is connected through a plurality of bolts;
the underground chamber simulation component is used for simulating structures of underground roadways, air inlet shafts, air return shafts and goafs, and the influence on water storage and energy storage is simulated through the arrangement of the geometric dimensions and physical parameters of the underground chamber simulation component; the goaf simulation box 30 is hung below the transparent cover plate 13, a first opening 131 for arranging the air inlet well simulation pipeline 21 is arranged in the middle of the transparent cover plate 13, and a second opening 132 for arranging the air return well simulation pipeline 25 is arranged on the periphery of the transparent cover plate;
one end of the air inlet well simulation pipeline 21 is fixed on the water injection tank 50 and is not communicated with the water injection tank 50, and the other end of the air inlet well simulation pipeline 21 can be connected with the plurality of roadway simulation pipelines 24 through the pipeline interface 23, namely the air inlet well simulation pipeline 21 is in an open state, and the air pressure in the pipeline is equal to the atmospheric pressure; the water bath 10 can regulate the temperature of the roadway simulation pipeline 24 and the goaf simulation box 30, namely, the simulation of water storage and energy storage is realized through the hydrothermal conduction in the water bath 10; PVC transparent plastic hoses are selected as the air inlet well simulation pipelines 21 and the air return well simulation pipelines 25, polyurethane is adopted for heat preservation outside the hoses, and geometric parameters such as the length, the inner diameter and the like of the air inlet well simulation pipelines 21 and the air return well simulation pipelines 25 can be selected according to experimental requirements; the roadway simulation pipeline 24, the pipeline interface 23 and the water permeable gasket 32 are all made of PVC materials and do not keep warm, and geometric parameters such as the length, the inner diameter and the like can be selected according to experimental requirements and meet sealing requirements;
The water permeable gasket 32 is positioned at the joint of the roadway simulation pipeline 24 and the goaf simulation box 30, and the water permeability of the water permeable gasket depends on the size of the porosity and is used for simulating the water inlet condition of the water storage entering the goaf simulation box 30 from the roadway simulation pipeline 24;
the water storage and pumping component is used for simulating different water storage and pumping working conditions; the second heater 51 and the second condenser 52 in the water injection tank 50 are used for temperature adjustment, and the elevation adjustment is performed through the lifting assembly to realize simulated injection water pressure, so that the conditions of unstable water pressure, temperature loss and the like under the well caused by adopting the lifting gravity water pressure can be avoided by adopting the pressurizing pump; the water filling tank 50 can be a cube tank structure which adopts an acrylic transparent plate and adopts polyurethane for heat preservation outside, such as polyurethane with the thickness of 1cm, the length of 30cm, the width of 30cm and the height of 40 cm;
The pipe assembly is used for storing and pumping water between the water injection tank 50 and the goaf simulation box 30, one end of the pipe assembly is movably positioned in the air inlet well simulation pipeline 21, and the influence of different water storage points on water storage and energy storage can be simulated by changing the position of the tail end of the pipe assembly in the air inlet well simulation pipeline 21 or the roadway simulation pipeline 24;
In the monitoring components, the temperature monitor 61 can be positioned in the water bath 10, the water injection tank 50, the air inlet well simulation pipeline 21, the air return well simulation pipeline 25, the roadway simulation pipeline 24 and the goaf simulation box 30 for monitoring water temperatures at different places in real time; the water pressure monitor 63 is arranged in the air inlet well simulation pipeline 21, the air return well simulation pipeline 25, the roadway simulation pipeline 24 and the goaf simulation box 30 and is used for monitoring water pressure of different places in real time; the flow monitor 62 is disposed in the pipe assembly, i.e., the water storage pipe 22, the water pumping pipe 54, for monitoring the water storage and water pumping flow in real time;
the monitoring part records the monitored data in the controller 70, the controller 70 is a computer control console with data analysis and processing capability, and the computer control console can feed back the data, switch and control corresponding water storage and pumping modes and calculate the water storage capacity, the water pumping capacity and the energy variation; the temperature monitor 61, the water pressure monitor 63 and the flow monitor 62 are all wire-type sensing, and corresponding wires pass through the structures such as the air inlet well simulation pipeline 21, the air return well simulation pipeline 25, the roadway simulation pipeline 24 and the goaf simulation box 30 through special pressure-resistant holes; the temperature monitor 61 adopts a waterproof design, the temperature measuring range is within the range of 0-100 ℃, and the model of the temperature monitor 61 can be selected according to a specific simulation scheme; when the model similarity ratio of the experimental system is 1:1000, the accuracy of the water pressure monitor 63 can reach the purpose of monitoring the change of the water level of 1m in the field, namely the pressure measuring accuracy of the water pressure monitor 63 is 10Pa, the accuracy of the flow monitor 62 needs to monitor the change of the field scale of 1m 3/h in real time, and the measuring accuracy of the flow monitor 62 is 1 multiplied by 10 < -4 > mm 3/s; the controller 70 can monitor the temperature, water pressure and flow, calculate the accumulated water storage amount, the water pumping amount and the energy variation after water storage and control the temperature of the water injection tank 50; the arrangement positions of the temperature monitor 61, the water pressure monitor 63 and the flow monitor 62 in multiple experiments are almost unchanged, so that the temperature monitor 61, the water pressure monitor 63 and the flow monitor 62 can be integrally formed in the manufacturing process of the water storage and energy storage experimental system, and the trouble of secondary assembly is avoided.
The proportion of the model of the abandoned mine water storage and energy storage experimental system to an actual chamber is 1:1000;
In an initial state, cleaning and drying the underground chamber simulation component and the water storage and pumping component;
Analyzing production geological information of abandoned mines, determining the size, space geometric position and chamber damage condition of each mining chamber of the mines, and arranging underground chamber simulation components, wherein the underground chamber simulation components comprise physical characteristic parameters such as the size, position and angle of a goaf simulation box 30, the grading of internal broken stones 31 and the like; physical characteristic parameters such as the height, the angle and the like of the roadway simulation pipeline 24; the positions and angles of the goaf simulation boxes 30 can be adjusted through the telescopic support 16 and the adjusting support 17, and physical parameters of the roadway simulation pipelines 24 and the broken stones 31 can be manually processed;
Installing a temperature monitor 61, a flow monitor 62, and a water pressure monitor 63 in the monitoring part to monitor temperatures, flows, and water pressures at different locations and to transmit the monitored real-time data to the controller 70;
the controller 70 controls the temperature in the water bath 10 to simulate the formation temperature, and controls the temperature in the water injection tank 50 to simulate the water temperature at the time of water storage; the lifting assembly lifts the water injection tank 50 and the other end of the return air well simulation pipeline 25 to a proper position;
When water is stored, water in the water injection tank 50 enters the plurality of roadway simulation pipelines 24 and the corresponding goaf simulation boxes 30 from the pipe assembly until the goaf simulation boxes 30 are injected with water or the water storage pressure of the roadway simulation pipelines 24 reaches a set pressure; when pumping water, one end of the pipe assembly generates negative pressure and starts a water pumping flow according to target water pumping parameters;
during the water storage and pumping process, the temperature monitor 61, the flow monitor 62 and the water pressure monitor 63 monitor the temperature, the flow and the water pressure at different positions correspondingly, and transmit the monitoring data to the controller 70;
After water storage and water pumping are completed, multiple circulation experiments can be performed under the same condition environment, variation characteristic observation experiments of water pressure, flow speed and temperature in a downhole chamber in the water storage and energy storage process are completed, and the water storage and energy storage efficiency of the abandoned mine, the water storage and energy storage efficiency of the mine and the water storage and energy storage utilization efficiency of the abandoned mine are calculated according to the monitoring data.
In a preferred embodiment, the pipe assembly has a water storage pipe 22, a water suction pipe 54, and a three-way electromagnetic valve and a vacuum pump 53 controlled by a controller 70;
one end of the water storage pipe 22 is positioned in the air inlet well simulation pipeline 21, and the other end of the water storage pipe is communicated with the water injection tank 50 after passing through a three-way electromagnetic valve;
The other port of the three-way electromagnetic valve is refluxed into the water injection tank 50 through the water pumping pipe 54, and the water pumping pipe 54 is provided with a vacuum pump 53;
Specifically, the three-way electromagnetic valve, the vacuum pump 53 and the controller 70 are connected to perform water storage and pumping switching and control of water storage and pumping flow; wherein the controller 70 is used for controlling the opening size of the three-way electromagnetic valve through the flow monitor 62, and when water storage is carried out, the controller 70 controls the three-way electromagnetic valve and the opening of the water pumping pipe 54 to be closed; when pumping water, the controller 70 controls the opening of the three-way electromagnetic valve between the water storage pipe 22 and the water injection tank 50 to be closed, and the water pumping pipe 54 is opened and the vacuum pump 53 is started.
In this case, the flow monitor 62 is mounted on both the water storage pipe 22 and the water suction pipe 54.
As shown in fig. 4 to 6, in a preferred embodiment, the middle part of the goaf simulating box 30 is positioned at the lower end of the telescopic bracket 16 through the angle adjustment of the adjusting support 17;
the adjusting support 17 is a spherical hinge structure with a damping structure;
the upper end of the telescopic bracket 16 is arranged on the inner side of the transparent cover plate 13 at the upper part of the water bath 10;
Specifically, the telescopic bracket 16 may employ a conventional telescopic rod for adjusting the heights of the plurality of goaf simulation boxes 30;
The telescopic bracket 16 and the adjusting support 17 are made of stainless steel; the adjusting support 17 is positioned at the lower end of the telescopic bracket 16 and connected with the goaf simulation boxes 30, and adopts a spherical hinge structure for adjusting different angles of the goaf simulation boxes 30;
as shown in fig. 6, as an example, the adjustment stand 17 has a ball bar 171 mounted on the goaf-simulating box 30, and a support base 172 at the lower end of the telescopic bracket 16;
the support seat 172 is provided with a blind hole for placing a spring 174 and an adjusting screw 173 in threaded installation;
the ball head of the ball rod 171 is rotatably positioned in the supporting seat 172, and the spring 174 is extruded and acted on the ball head under the action of the adjusting screw 173;
namely, the adjusting screw 173 is rotated to compress the spring 174, so that the spring 174 acts on the ball head of the ball rod 171, the friction force is increased to realize the angular positioning of the ball rod 171, namely, the goaf simulation box 30 is regulated in angle;
One embodiment 1 mounted as a telescopic bracket 16;
the inner side of the transparent cover plate 13 is provided with a plurality of transverse guide rails 14 and longitudinal guide rails 15;
The cross sections of the transverse guide rail 14 and the longitudinal guide rail 15 are sliding grooves with T-shaped structures; the supporting block 18 at the upper end of the telescopic bracket 16 is positioned in the transverse guide rail 14 or the longitudinal guide rail 15 in a matched sliding manner;
Specifically, the supporting blocks 18 can freely move in the transverse guide rail 14 and the longitudinal guide rail 15 so as to ensure the position adjustment of the plurality of goaf simulation boxes 30 in the water bath 10;
The transverse guide rail 14 and the longitudinal guide rail 15 can be of a traditional structure or have a T-shaped chute in section, and the support blocks 18 can be transitionally switched from the transverse guide rail 14 to the longitudinal guide rail 15;
one embodiment 2 mounted as a telescopic bracket 16;
The inner side of the transparent cover plate 13 is provided with a plurality of internal threaded holes;
The support block 18 at the upper end of the telescopic bracket 16 is in threaded installation with the internal threaded hole;
specifically, according to experimental requirements, the telescopic bracket 16 can be installed on the transparent cover plate 13 in a threaded manner, so that quick assembly is realized;
in a preferred scheme, the broken stone 31 is a common sandstone fragment, and phenolphthalein liquid is smeared outside;
The water injection tank 50 is filled with acidic water storage solution; one side of the water bath 10 is a transparent plate, and a camera for recording the color-changing distribution characteristics of the broken stone 31 under different water storage parameter conditions is arranged at the corresponding outer side;
Specifically, when the acidic aqueous solution in the water injection tank 50 enters the plurality of roadway simulation pipes 24 and the corresponding goaf simulation boxes 30 from the water storage pipe 22, the acidic aqueous solution contacts the phenolphthalein rubble 31, so that the rubble 31 forms red color;
the outside camera records the color-changing distribution characteristics of the crushed stone 31 under the condition of different water storage parameters so as to facilitate personnel to observe the flowing condition of the water storage entering the plurality of goaf simulation boxes 30.
As shown in fig. 2, the lifting assembly preferably has a vertically arranged boom 41, a pulley 43 rotatably disposed at the upper end of the boom 41, and a hoist rope 42;
One end of the lifting rope 42 is connected with the return air well simulation pipeline 25 or the water injection tank 50, and the other end is wound on the outer side of the pulley 43 and then connected to the lifting rod 41;
Specifically, the boom 41 is made of a seamless steel pipe, is welded with a steel frame of the water bath 10, the pulley 43 is made of cast iron, and the lifting rope 42 is made of a steel wire rope;
Preferably, the water injection tank 50 is slidably positioned on the hanging rod 41, a plurality of positioning holes are arranged on the hanging rod 41, and one end of the hanging rope 42 is fixed in the positioning holes for adjusting the height of the water injection tank 50; or the suspender 41 is provided with a chute which is arranged up and down, a positioning slide block is matched in the chute, a bolt is arranged on the positioning slide block in a threaded manner, and the positioning slide block is locked in the chute, so that the adjustment of each height of the water injection tank 50 can be realized;
accordingly, the return air well simulation pipe 25 may employ the same lifting structure.
Example 1
When simulating abandoned mine pumped storage power station experiments, the abandoned mine water storage and energy storage experimental system specifically comprises the following steps:
S1, cleaning and drying a downhole chamber simulation component and a water storage and pumping component, smearing a litmus solution on broken stones 31 in a goaf simulation box 30, and drying;
S2, analyzing geological information of abandoned mine production, determining the size, space geometric position and chamber damage condition of each mining chamber of the mine, and arranging underground chamber simulation components including physical characteristic parameters such as the size, position and angle of a goaf simulation box 30, grading, quantity and the like of internal broken stones 31; physical characteristic parameters such as the height, the angle and the like of the roadway simulation pipeline 24;
Installing a flow monitor 62 in the monitoring component to monitor flow at different locations and communicating the monitored real-time data to the controller 70;
S3, keeping the water bath 10 dry; storing the meta-acidic solution in a water injection tank 50;
The lifting assembly lifts the water injection tank 50 and the other end of the return air well simulation pipeline 25 to a proper position, and records the average height difference between the water bath tank 10 and the roadway simulation pipeline as h;
S4, starting the three-way electromagnetic valve to achieve the target flow rate Performing waste mine water storage simulation for the first time, monitoring the flow rate of each monitoring point in real time, and calculating the water storage quantity;
Specifically, the water storage time is The water storage pressure of the roadway simulation pipeline 24 isThe calculation formula of the real-time water storage amount is as follows:
the calculation formula of the real-time potential energy reduction of the waste mine water storage capacity is as follows:
wherein, To the density of water in the water filling tank 50 during water storageGravitational acceleration;
the calculation formula for generating electric energy in real time by water storage is as follows:
wherein, The conversion rate of gravitational potential energy and electric energy in the water storage process is used; /(I)
When water is stored, water in the water injection tank 50 enters the plurality of roadway simulation pipelines 24 and the corresponding goaf simulation boxes 30 from the pipe assemblies, when the acidic water storage solution is in contact with the crushed stone 31 in the goaf simulation boxes 30, the crushed stone 31 becomes red, and the color change distribution characteristics of the crushed stone 31 under the condition of different water storage parameters are recorded through a camera;
s5, when the water storage pressure of the roadway simulation pipeline 24 meets After that, stopping water storage and waiting for stabilizationAfter the time, the controller 70 controls the water pumping pipe 54 to be opened, and then the water pumping flow is started according to the target water pumping parameters;
Specifically, the pumping flow rate is Pumping time isThe calculation formula of the real-time water pumping quantity is as follows:
The calculation formula of the real-time potential energy increment of the waste mine water pumping amount is as follows:
the calculation formula of the pumping consumption electric energy is as follows:
wherein, The ratio of the pumping electricity consumption to the potential energy increment of water in the pumping process is calculated;
The calculation formula of the waste mine water storage and electric energy storage efficiency is as follows:
S6, repeating the steps S1-S5 to finish simulation experiments of the waste mine pumped storage power station under multiple cycles;
All liquid in the water injection tank 50 and the underground chamber simulation component is discharged, experimental equipment is cleaned, and the relation between the cycle times and the electric energy storage efficiency of the waste mine water storage is analyzed;
When the multiple-cycle experiment is carried out, the average value of the water storage and electric energy storage efficiency of the abandoned mine is taken as the final water storage and electric energy storage efficiency of the abandoned mine under the annular condition of the parameter.
Example 2
When simulating abandoned mine water storage heat storage/cold experiment, the abandoned mine water storage heat storage experiment system specifically comprises the following steps:
S1, cleaning and drying a downhole chamber simulation component and a water storage and pumping component, smearing a litmus solution on broken stones 31 in a goaf simulation box 30, and drying;
S2, analyzing geological information of abandoned mine production, determining the size, space geometric position and chamber damage condition of each mining chamber of the mine, and arranging underground chamber simulation components including physical characteristic parameters such as the size, position and angle of a goaf simulation box 30, grading, quantity and the like of internal broken stones 31; physical characteristic parameters such as the height, the angle and the like of the roadway simulation pipeline 24;
Installing a temperature monitor 61, a flow monitor 62, and a water pressure monitor 63 in the monitoring part to monitor temperatures, flows, and water pressures at different locations and to transmit the monitored real-time data to the controller 70;
S3, fully storing tap water in the water bath tank 10, simulating the temperature of the water bath tank 10 at a target stratum temperature at a temperature change flow rate of +5 ℃/h or-5 ℃/h, keeping the constant temperature for one hour, and performing a waste mine water storage and heat storage experiment when the temperature is changed at +5 ℃/h, and performing a waste mine water storage and heat storage experiment when the temperature is changed at-5 ℃/h;
The meta-acid solution is stored in a water injection tank 50, the temperature of the water injection tank 50 is simulated at the target initial water storage temperature at the temperature change flow rate of +5 ℃/h or-5 ℃/h, and the constant temperature is maintained for one hour;
the lifting assembly lifts the water injection tank 50 and the other end of the return air well simulation pipeline 25 to a proper height;
S4, starting the three-way electromagnetic valve to achieve the target flow rate Performing waste mine water storage simulation for the first time, monitoring the water pressure, temperature and flow rate of each monitoring point in real time, and calculating the water storage quantity;
Specifically, the water storage temperature is The water storage time isThen
The calculation formula of the real-time water storage capacity is as follows:
the calculation formula of the real-time water storage heat/cold quantity is as follows:
wherein, Gravitational acceleration; /(I)、Time/>, respectivelyCorresponding temperature isThe specific heat capacity and density of water in the water injection tank 50, when the acidic water storage solution contacts with the crushed stone 31 in the goaf simulation box 30, the crushed stone 31 turns red, and the color change distribution characteristics of the crushed stone 31 under different water storage parameter conditions are recorded through a camera;
s5, when the water storage pressure of the roadway simulation pipeline 24 meets After that, stopping water storage and waiting for stabilizationAfter the time, the controller 70 controls the three-way electromagnetic valve to be positioned at the opening of the port of the water pumping pipe 54, then starts the water pumping flow according to the target water pumping parameter, records the water pressure, the water temperature and the flow rate of each monitoring point in the water pumping process and calculates the water pumping volume and the energy difference after water storage;
Specifically, the pumping flow rate is Pumping time isThe pumping temperature isThe calculation formula of the real-time water pumping quantity is as follows:
the calculation formula of the real-time pumping heat/cold quantity of the abandoned mine is as follows:
wherein, 、RespectivelyThe time-dependent temperature isSpecific heat capacity and density of water in the water injection tank 50;
The calculation formula of the heat/cold energy of the waste mine water storage volume after being utilized in the environment of the water pumping time period is as follows:
The calculation formula of the heat/cold energy of the waste mine water pumping volume after being utilized in the environment of the water pumping time period is as follows:
wherein, The average air temperature in the local season when the waste mine heat/cold energy is utilized after water pumping;
The average water specific heat capacity in the local season when the waste mine heat/cold energy is utilized after water pumping; /(I)
The average water density in the local season when the waste mine heat/cold energy is utilized after water pumping;
The calculation formula of the available heat/cold energy of the waste mine water storage capacity in the water pumping time period environment is as follows:
the calculation formula of the available heat/cold energy of the waste mine water pumping quantity in the water pumping time period environment is as follows:
the calculation formula of the water storage efficiency of the abandoned mine is as follows:
the calculation formula of the water storage and energy storage efficiency of the abandoned mine is as follows:
The calculation formula of the utilization efficiency of the water storage and energy storage of the abandoned mine is as follows:
S6, repeating the steps S1-S5 to finish the waste mine water storage heat storage/cold simulation experiment under multiple cycles;
All the liquid in the water injection tank 50 and the underground chamber simulation component is discharged, the experimental equipment is cleaned, and the relation between the cycle times and the water storage efficiency of the abandoned mine, the water storage and energy storage efficiency of the abandoned mine and the water storage and energy storage utilization efficiency of the abandoned mine are analyzed;
when the cyclic experiment is carried out for a plurality of times, the average value of the water storage efficiency of the abandoned mine, the average value of the water storage energy storage efficiency of the abandoned mine and the average value of the water storage energy storage utilization efficiency of the abandoned mine can be calculated.
Example 3
When the variation characteristic experiment of water pressure, flow speed and temperature in the underground chamber in the process of simulating the waste mine water storage and energy storage, the waste mine water storage and energy storage experimental system specifically comprises the following steps:
S1, cleaning and drying a downhole chamber simulation component and a water storage and pumping component, smearing a litmus solution on broken stones 31 in a goaf simulation box 30, and drying;
S2, analyzing geological information of abandoned mine production, determining the size, space geometric position and chamber damage condition of each mining chamber of the mine, and arranging underground chamber simulation components including physical characteristic parameters such as the size, position and angle of a goaf simulation box 30, grading, quantity and the like of internal broken stones 31; physical characteristic parameters such as the height, the angle and the like of the roadway simulation pipeline 24;
Installing a temperature monitor 61, a flow monitor 62, and a water pressure monitor 63 in the monitoring part to monitor temperatures, flows, and water pressures at different locations and to transmit the monitored real-time data to the controller 70;
S3, fully storing tap water in the water bath tank 10, simulating the temperature of the water bath tank 10 at a target stratum temperature at a temperature change flow rate of +5 ℃/h or-5 ℃/h, keeping the constant temperature for one hour, and performing a waste mine water storage and heat storage experiment when the temperature is changed at +5 ℃/h, and performing a waste mine water storage and heat storage experiment when the temperature is changed at-5 ℃/h;
The meta-acid solution is stored in a water injection tank 50, the temperature of the water injection tank 50 is simulated at the target initial water storage temperature at the temperature change flow rate of +5 ℃/h or-5 ℃/h, and the constant temperature is maintained for one hour;
the lifting assembly lifts the water injection tank 50 and the other end of the return air well simulation pipeline 25 to a proper height;
S4, starting the three-way electromagnetic valve to achieve the target flow rate And target temperaturePerforming primary water storage, performing waste mine water storage simulation, monitoring the water pressure, temperature and flow rate of each monitoring point in real time, and calculating the water storage quantity;
Specifically, the water storage time is The calculation formula of the real-time water storage is as follows:
The temperature of the wind well simulation pipeline is The water pressure isThe return air well simulates the temperature of the pipe 25 to beThe water pressure isRoadway simulation pipeline 24 temperature isThe water pressure isGoaf simulation box 30 temperature isThe water pressure isWhen the acidic water storage solution is in contact with the crushed stone 31 in the goaf simulation box 30, the crushed stone 31 turns red, and the color change distribution characteristics of the crushed stone 31 under different water storage parameter conditions are recorded through a camera;
s5, when the water storage pressure of the roadway simulation pipeline 24 meets After that, stopping water storage and waiting for stabilizing timeThen, the controller 70 controls the three-way electromagnetic valve to be positioned at the opening of the port of the water pumping pipe 54, then starts the water pumping flow according to the target water pumping parameters, records the water pressure, the water temperature and the flow rate of each monitoring point in the water pumping process and calculates the energy difference of the pumped volume of water before and after water storage and energy storage;
Specifically, the pumping flow rate is Pumping time isThe calculation formula of the real-time water pumping quantity is as follows:
s6, repeating the steps S1-S5, and completing a characteristic observation experiment of changes of water pressure, flow speed and temperature in a downhole chamber in the process of storing water and energy of the abandoned mine in multiple cycles;
s7, discharging all the liquid in the water bath tank 10, the water injection tank 50 and the underground chamber simulation component, changing the temperature and the water injection flow rate in the water injection tank 50, repeating the steps S1-S6, and completing the observation experiment of the variation characteristics of the water pressure, the flow rate and the temperature in the underground chamber in the water storage and energy storage process of the abandoned mine under the conditions of different water injection temperatures and water injection flow rates
Finally, all the liquid in the water injection tank 50 and the underground chamber simulation component is discharged, experimental equipment is cleaned, the relation between the temperature and the pressure of the underground chamber along with the storage and extraction time is counted, and data support is provided for researching the analysis of the stability of the surrounding rock of the underground chamber of the cyclic load abandoned mine water storage and energy storage well.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Claims (7)
1. An abandoned mine retaining energy storage experimental system, which is characterized by comprising:
A water bath box (10) for sealing the box body and simulating the stratum temperature;
A downhole chamber simulation component having an air inlet well simulation pipe (21), an air return well simulation pipe (25), a roadway simulation pipe (24), and a goaf simulation box (30) having crushed stones (31) inside;
One end of an air inlet well simulation pipeline (21) is fixed on the water injection tank (50), and the other end of the air inlet well simulation pipeline is connected with a plurality of roadway simulation pipelines (24); each roadway simulation pipeline (24) is connected with a corresponding goaf simulation box (30), and a water permeable pad (32) is arranged at the joint; the goaf simulation box (30) is hung in the water bath box (10) at different angles and positions;
one end of the return air well simulation pipeline (25) is connected with the goaf simulation box (30);
a water storage and pumping part provided with a water injection tank (50) for simulating water storage temperature and a pipe assembly with one end moving and positioned in a ventilation well simulation pipeline (21) for water storage and pumping;
the other ends of the water injection tank (50) and the return air well simulation pipeline (25) are subjected to height adjustment through a lifting assembly;
A monitoring unit having a temperature monitor (61), a flow monitor (62), and a water pressure monitor (63) connected to the controller (70);
The temperature monitor (61) is arranged on the water bath tank (10), the water injection tank (50) and the underground chamber simulation component and is used for monitoring water temperatures at different positions; a flow monitor (62) is disposed on the pipe assembly for monitoring the flow of the water stored and pumped; the water pressure monitor (63) is arranged on the underground chamber simulation component and is used for monitoring water pressures at different positions;
the pipe assembly is provided with a water storage pipe (22), a water suction pipe (54), a three-way electromagnetic valve controlled by a controller (70) and a vacuum pump (53);
One end of the water storage pipe (22) is positioned in the air inlet well simulation pipeline (21), and the other end of the water storage pipe is communicated with the water injection tank (50) after passing through the three-way electromagnetic valve;
The other port of the three-way electromagnetic valve is refluxed into the water injection tank (50) through the water pumping pipe (54), and the water pumping pipe (54) is provided with a vacuum pump (53);
the middle part of the goaf simulation box (30) is positioned at the lower end of the telescopic bracket (16) through angle adjustment of the adjusting support (17);
the adjusting support (17) is a spherical hinge structure with a damping structure;
The upper end of the telescopic bracket (16) is arranged at the inner side of a transparent cover plate (13) at the upper part of the water bath box (10);
The adjusting support (17) is provided with a ball rod (171) arranged on the goaf simulation box (30) and a supporting seat (172) positioned at the lower end of the telescopic bracket (16);
the support seat (172) is provided with a blind hole for placing a spring (174) and an adjusting screw (173) in threaded installation;
The ball head of the ball rod (171) is rotatably arranged in the supporting seat (172), and the spring (174) is pressed on the ball head under the action of the adjusting screw (173).
2. The abandoned mine water storage and energy storage experimental system according to claim 1 is characterized in that a plurality of transverse guide rails (14) and longitudinal guide rails (15) are arranged on the inner side of the transparent cover plate (13);
The cross sections of the transverse guide rail (14) and the longitudinal guide rail (15) are sliding grooves with T-shaped structures; the upper end of the telescopic bracket (16) is provided with a supporting block (18), and the supporting block (18) slides in the transverse guide rail (14) or the longitudinal guide rail (15).
3. The abandoned mine water storage and energy storage experimental system according to claim 1, wherein a plurality of internal threaded holes are formed in the inner side of the transparent cover plate (13);
The supporting block (18) at the upper end of the telescopic bracket (16) is in threaded installation with the internal threaded hole.
4. A abandoned mine water and energy storage test system according to claim 1, characterized in that the crushed stone (31) is a sandstone fragment and is externally coated with a litmus liquid;
The water injection tank (50) is internally provided with an acidic water storage solution; one side of the water bath box (10) is a transparent plate, and a camera for recording the color-changing distribution characteristics of the broken stone (31) under different water storage parameter conditions is arranged on the corresponding outer side.
5. A abandoned mine water storage and energy storage experiment system according to claim 1, characterized in that the lifting assembly has a vertically arranged boom (41), a pulley (43) turned at the upper end of the boom (41), and a lifting rope (42);
one end of the lifting rope (42) is connected with the return air well simulation pipeline (25) or the water injection tank (50), and the other end is wound on the outer side of the pulley (43) and then connected to the suspender (41).
6. The abandoned mine water storage and energy storage experimental method according to claim 4 is characterized by comprising the following steps:
S1, cleaning and drying a downhole chamber simulation component and a water storage and pumping component, smearing a litmus solution on broken stones (31) in a goaf simulation box (30), and drying;
S2, analyzing geological information of abandoned mine production, determining the size, space geometric position and chamber damage condition of each mining chamber of the mine, and arranging underground chamber simulation components, wherein the underground chamber simulation components comprise the size, position and angle of a goaf simulation box (30) and the grading and quantity of internal broken stones (31); simulating the height and angle of a pipeline (24) in a roadway;
installing a temperature monitor (61), a flow monitor (62), and a water pressure monitor (63) in the monitoring part to monitor temperatures, flows, and water pressures at different locations and transmitting the monitored real-time data to a controller (70);
S3, storing the meta-acid solution in a water injection tank (50);
The lifting assembly lifts the other ends of the water injection tank (50) and the return air well simulation pipeline (25) to proper positions, and records the average height difference between the water bath tank (10) and the roadway simulation pipeline as h;
s4, when water storage is carried out, the three-way electromagnetic valve is started to achieve the target flow velocity Time isPerforming water storage simulation of the abandoned mine for the first time, and monitoring the water pressure, the temperature and the flow rate of each monitoring point in real time;
The calculation formula of the real-time water storage is:
The water in the water injection tank (50) enters a plurality of roadway simulation pipelines (24) from the water storage pipe (22) and the corresponding goaf simulation boxes (30), when the acidic water storage solution is in contact with the crushed stone (31) in the goaf simulation boxes (30), the crushed stone (31) can turn red, and the color change distribution characteristics of the crushed stone (31) under the condition of different water storage parameters are recorded through a camera;
When the water storage pressure of the roadway simulation pipeline (24) is satisfied After the water storage is stopped, after the water storage is stabilized for a certain time, the controller (70) controls the port of the three-way electromagnetic valve positioned on the water suction pipe (54) to be opened, and the target flow rate is taken asTime isPerforming pumping simulation on waste mines for the first time, and recording the water pressure, water temperature and flow rate of each monitoring point in the pumping process;
The calculation formula of the real-time water pumping amount is as follows:
S5, when a simulation experiment of the waste mine pumped storage power station is carried out, the water bath box (10) before water storage is kept dry;
the calculation formula of the real-time potential energy reduction of the waste mine water storage capacity is as follows:
Wherein ρ is the density of water in the water filling tank (50) in the water storage process, g is the gravity acceleration;
the calculation formula for generating electric energy in real time by water storage is as follows:
Wherein eta QE is the conversion rate of gravitational potential energy and electric energy in the water storage process;
The calculation formula of the real-time potential energy increment of the waste mine water pumping amount is as follows:
the calculation formula of the pumping consumption electric energy is as follows:
Wherein eta EQ is the ratio of the pumping electricity consumption to the potential energy increment of water in the pumping process;
The calculation formula of the energy storage efficiency of the abandoned mine water storage is as follows:
When the waste mine water storage heat storage/cold experiment is simulated, tap water is fully stored in the water bath tank (10) before water storage, and the temperature of the water bath tank (10) and the temperature of the water injection tank (50) are correspondingly simulated to the stratum temperature and the initial water storage temperature according to certain temperature changes;
The calculation formula of the real-time water storage heat/cold quantity of the abandoned mine is as follows:
wherein g is gravitational acceleration;
Respectively/> The time-dependent temperature isSpecific heat capacity and density of water in the water filling tank (50);
the calculation formula of the real-time pumping heat/cold quantity of the abandoned mine is as follows:
wherein, RespectivelyThe time-dependent temperature isSpecific heat capacity and density of water in the water filling tank (50);
the calculation formula of the heat/cold energy of the waste mine water storage volume after being utilized in the environment of the water pumping time period is as follows:
The calculation formula of the heat/cold energy of the waste mine water pumping volume after being utilized in the environment of the water pumping time period is as follows:
wherein, The average air temperature in the local season when the waste mine heat/cold energy is utilized after water pumping;
The average water specific heat capacity in the local season when the waste mine heat/cold energy is utilized after water pumping;
the average water density in the local season when the waste mine heat/cold energy is utilized after water pumping;
The calculation formula of the available heat/cold energy of the waste mine water storage capacity in the water pumping time period environment is as follows:
the calculation formula of the available heat/cold energy of the waste mine water pumping quantity in the water pumping time period environment is as follows:
the calculation formula of the water storage efficiency of the abandoned mine is as follows:
the calculation formula of the water storage and energy storage efficiency of the abandoned mine is as follows:
The calculation formula of the utilization efficiency of the water storage and energy storage of the abandoned mine is as follows:
when the characteristic experiment of the change of the water pressure, the flow rate and the temperature in the underground chamber in the process of storing and storing the water in the abandoned mine is simulated, tap water is fully stored in the water bath tank (10) before storing the water, and the temperature of the water bath tank (10) and the temperature of the water injection tank (50) correspondingly simulate the stratum temperature and the initial temperature of storing the water according to certain temperature changes;
The temperature of the wind well simulation pipeline is The water pressure isThe temperature of the return air well simulation pipeline (25) isThe water pressure isThe temperature of the roadway simulation pipeline (24) isThe water pressure isGoaf simulation box (30) temperature isThe water pressure is
Acquiring the measured temperature, water pressure and flow rate to obtain a variation characteristic observation experiment of the water pressure, the flow rate and the temperature in the underground chamber in the process of storing water and energy of the abandoned mine;
s6, repeating the steps S1-S5, and completing multiple simulation experiments under multiple circulation;
And S7, when the variation characteristic experiment of the water pressure, the flow rate and the temperature in the underground chamber in the water storage and energy storage process of the abandoned mine is simulated, all the liquid in the water bath tank (10), the water injection tank (50) and the underground chamber simulation component are discharged, the temperature and the water injection flow rate in the water injection tank (50) are changed, the steps S1-S6 are repeated, and the variation characteristic observation experiment of the water pressure, the flow rate and the temperature in the underground chamber in the water storage and energy storage process of the abandoned mine under different water injection temperatures and water injection flow rates is completed.
7. The method according to claim 6, wherein in step S5, the temperature of the water bath (10) is simulated at the target formation temperature with a temperature change of +5 ℃/h or-5 ℃/h, and kept at a constant temperature for one hour;
The temperature of the water injection tank (50) is simulated at the target initial water storage temperature by the temperature change of +5 ℃/h or-5 ℃/h, and the water injection tank is kept at the constant temperature for one hour.
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