CN115467710A - System and method for storing energy by utilizing compressed air in scrapped coal mine - Google Patents
System and method for storing energy by utilizing compressed air in scrapped coal mine Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 9
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- 238000012544 monitoring process Methods 0.000 claims abstract description 67
- 238000003860 storage Methods 0.000 claims abstract description 57
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005065 mining Methods 0.000 claims abstract description 6
- 239000011435 rock Substances 0.000 claims description 22
- 238000004146 energy storage Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
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- 230000008859 change Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002689 soil Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
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- 238000006386 neutralization reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/007—Underground or underwater storage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- General Engineering & Computer Science (AREA)
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Abstract
The system comprises a plugging mechanism, an air inlet mechanism, an air outlet mechanism, a pressure monitoring mechanism, a hydrological observation hole and a gas pressure monitoring hole, wherein the plugging mechanism plugs available space of the scrapped coal mine to form a sealed air storage space, the air inlet mechanism and the air outlet mechanism can respectively control air inlet and air outlet of the air storage space, the pressure monitoring mechanism can monitor the pressure of underground abandoned space adjacent to the air storage space, the hydrological observation hole is arranged in a water-bearing stratum of a mining area, and the gas pressure monitoring hole is arranged in a related coal seam adjacent to a mine. The invention has the advantages that: the large-capacity compressed air storage and release are realized, and the safety influence of formation pressure transmission on the occurrence of gas close to a mine and hydrology can be judged.
Description
Technical Field
The invention relates to the technical field of compressed air energy storage, in particular to a system and a method for storing compressed air energy by utilizing a scrapped coal mine.
Background
The energy storage technology is one of key technologies influencing future energy patterns, and has great significance for improving energy efficiency, promoting the development of new energy related industries, promoting energy strategic transformation and accelerating the realization of carbon peak-reaching and carbon neutralization strategic targets. Compressed air energy storage is a technology which is considered to be suitable for GW-level large-scale electric energy storage after pumped storage.
Compressed air storage is one of the core links in a compressed air energy storage system. The scheme of several domestic implementations at present utilizes discarded underground salt deposit mine hole or high-pressure gas holder to store compressed air, and the not enough of existence has: salt mine holes which are abandoned in China and have proper geological conditions are few and extremely unbalanced in distribution, so that the salt mine holes are difficult to popularize and use; at present, the maximum volume of domestic medium-high pressure storage tanks is about 100m 3 Obviously, the system is far from shortage when being used for a high-capacity compressed air energy storage system, and the manufacturing cost is high.
At present, the technology of storing compressed air by using underground space of a coal mine is still in a starting stage, generally, waste rock roadways of a production mine are considered to be utilized and blocked to form a closed space for energy storage, and the key point is that a space closing technology and a reinforcing and pressure-bearing technology are considered. For example, patent document CN109356650A discloses a method for storing compressed air energy by using a coal mine underground tunnel, which comprises the steps of firstly reforming a tunnel section, then plugging two end faces of the tunnel, finally placing a flexible air storage bag into the processed tunnel, and storing and calling the compressed air through an air inlet pipe and an air outlet pipe connected to the flexible air storage bag. Patent document No. CN110057121B discloses a method and device for high-efficiency compressed air energy storage by using waste underground coal mine geothermal energy, wherein heat-conducting gas storage bags are fixed in roadways with different depths, and each heat-conducting gas storage bag is connected with an inflation compression system and an exhaust power generation system through a gas pipe.
The technical defects of the prior art for storing compressed air by using underground space of a coal mine include: (1) the space of the waste rock roadway of the production mine is relatively small; (2) The safety influence of formation pressure transmission caused by high-pressure gas leakage on the occurrence of gas and hydrology of an adjacent mine is not considered; (3) monitoring of gas concentration in and out of the gas is not considered; (4) The control of a large amount of heat energy carried by high-pressure gas is not considered, and certain hidden danger exists.
Disclosure of Invention
The invention aims to solve the technical problems of how to realize the storage and release of large-capacity compressed air and can judge the safety influence of formation pressure transmission on the occurrence of gas and hydrology near a mine.
The invention solves the technical problems through the following technical means: the utility model provides an utilize scrapped coal mine to carry out system of compressed air energy storage, includes shutoff mechanism, mechanism of admitting air, mechanism of giving vent to anger, pressure monitoring mechanism, hydrology observation hole and gas pressure monitoring hole, shutoff mechanism will scrap the usable space shutoff of coal mine and form inclosed gas storage space, the mechanism of admitting air with the mechanism of giving vent to anger can be right respectively gas storage space air admission control and give vent to anger control, pressure monitoring mechanism can monitor adjacent to the pressure in gas storage space's abandonment space in the pit, hydrology observation hole sets up in mining area water-bearing stratum, gas pressure monitoring hole sets up in the relevant coal seam of neighbouring mine.
The economic and social problems after the abandoned mine exits can be effectively solved by utilizing the abandoned coal mine to store compressed air energy, and the huge underground space of the abandoned coal mine can realize the storage and release of large-capacity compressed air; monitoring the change condition of underground hydrology through the hydrology observation hole, monitoring the gas pressure of the relevant coal seam of neighbouring mine through the gas pressure monitoring hole, combine together the monitoring data of pressure monitoring mechanism with the change condition of underground hydrology and the gas pressure of the relevant coal seam of neighbouring mine, the pressure that can the integrated analysis gas storage space is to the transmission condition of surrounding rock stratum, correspondingly judge the safety influence of formation pressure transmission to near on mine gas occurrence and hydrology to in time take corresponding measure, the protection is close to mine safety production.
Preferably, the air inlet mechanism comprises an air inlet pipe and an air inlet monitoring unit, the air inlet pipe penetrates into the air storage space, and the air inlet monitoring unit comprises a first flow sensor, a first pressure sensor and a first temperature sensor which are arranged on the air inlet pipe; the mechanism of giving vent to anger includes outlet duct and the monitor cell of giving vent to anger, the outlet duct penetrates in the gas storage space, the monitor cell of giving vent to anger is including setting up second flow sensor, second pressure sensor, second temperature sensor and gas concentration sensor on the outlet duct. The device can monitor the conditions of flow, pressure, temperature, gas concentration and the like of inlet and outlet air, and ensures energy storage safety.
Preferably, still be provided with first electric gate valve and first manual gate valve in the intake pipe, still be provided with second electric gate valve and third manual gate valve on the outlet duct. And the automatic control and maintenance are convenient.
Preferably, the air inlet pipe is further provided with a first pressure relief valve, and the air outlet pipe is further provided with a second pressure relief valve. Overpressure protection is carried out through the pressure relief valve, the first pressure relief valve or the second pressure relief valve can be dismounted during maintenance, and the unmanned aerial vehicle carries the camera to enter the gas storage space through the gas inlet pipe or the gas outlet pipe for observation and inspection.
Preferably, the air inlet mechanism further comprises a vent pipe and a second manual gate valve; one end of the emptying pipe is connected with the middle section of the air inlet pipe, and the other end of the emptying pipe is communicated with outside air; and a third manual gate valve is arranged on the emptying pipe. When the internal condition of the air storage space needs to be checked, the air inlet is closed, the air outlet is opened, the second manual gate valve is opened, and compressed air can be released.
Preferably, a filtering device is further arranged on the air outlet pipe. The filtering device can filter dust, water vapor and the like in the well and protect power generation devices such as a steam turbine and the like.
Preferably, the pressure monitoring mechanism comprises a pressure monitoring pipe, a third pressure sensor and a fourth manual gate valve, the pressure monitoring pipe penetrates into the underground waste space adjacent to the gas storage space, and the third pressure sensor and the fourth manual gate valve are arranged on the pressure monitoring pipe. The third pressure sensor can monitor the pressure change condition of the underground waste space, and the fourth manual gate valve is used for overhauling the pressure monitoring pipe.
Preferably, the plugging mechanism comprises a plugging wall body and an anchor rod; the plugging wall body is of a truncated cone-shaped reinforced concrete structure, the large-diameter bottom surface of the plugging wall body faces to the low-pressure side, and the small-diameter bottom surface of the plugging wall body faces to the high-pressure side; a plurality of layers of anchor rods are arranged along the height direction of the plugging wall body at intervals, and a plurality of anchor rods on each layer are arranged into a circle along the circumferential direction of the plugging wall body; one part of the anchor rod is fixedly connected in the plugging wall body, and the other part of the anchor rod is fixedly connected in the surrounding rock. Has better plugging and pressure-bearing effects.
Preferably, the system further comprises a heat exchange means connected upstream of said air intake means. The heat exchange mechanism can store high-temperature compressed air into a downhole space after heat exchange is carried out to normal temperature, safety risks caused by high temperature are eliminated, meanwhile, the influence of large-amplitude change of air temperature on rock wall sealing quality is avoided, and the exchanged heat can be used for heating when gas is released.
The method for storing energy by utilizing the compressed air of the scrapped coal mine comprises the following steps of:
selecting available space of a scrapped coal mine;
analyzing the surrounding rock condition of the available space, and grouting and reinforcing the surrounding rock weak area;
step three, after the reinforcement is finished, firstly lining the anti-seepage concrete in the available space, and then lining a stainless steel plate for sealing;
after sealing is finished, plugging the available space through a plugging mechanism to form a sealed gas storage space, and arranging a gas inlet mechanism, a gas outlet mechanism, a pressure monitoring mechanism, a hydrological observation hole and a gas pressure monitoring hole;
step five, storing compressed air by using the air storage space, and continuously monitoring the safety influence of formation pressure transmission on the occurrence of gas and hydrology near a mine;
step six, when the internal condition of the air storage space needs to be checked, compressed air in the air storage space is released first, and then the unmanned aerial vehicle carries a camera to enter the air storage space for observation and checking;
and seventhly, when the surrounding rock needs to be locally processed at the later stage, grouting from the ground to perform reinforcement processing.
The invention has the advantages that:
1. the compressed air energy storage is carried out by utilizing the abandoned coal mine, so that the economic and social problems after the abandoned mine exits can be effectively solved, and the huge underground space of the abandoned coal mine can realize the storage and release of large-capacity compressed air.
2. The underground hydrographic change condition is monitored through the hydrographic observation hole, the gas pressure of the related coal bed of the adjacent mine is monitored through the gas pressure monitoring hole, the monitoring data of the pressure monitoring mechanism is combined with the underground hydrographic change condition and the gas pressure of the related coal bed of the adjacent mine, the pressure of a gas storage space can be comprehensively analyzed to transmit the condition to the surrounding rock stratum, and the safety influence of formation pressure transmission on the gas occurrence and the hydrographic of the adjacent mine is correspondingly judged, so that corresponding measures are taken in time, and the safety production of the adjacent mine is protected.
3. The device can monitor the conditions of flow, pressure, temperature, gas concentration and the like of inlet and outlet air, and ensures energy storage safety.
4. Overpressure protection is carried out through the pressure relief valve, the first pressure relief valve or the second pressure relief valve can be dismounted during maintenance, and the unmanned aerial vehicle carries the camera to enter the gas storage space through the gas inlet pipe or the gas outlet pipe for observation and inspection.
5. When the internal condition of the air storage space needs to be checked, the air inlet is closed, the air outlet is opened, the second manual gate valve is opened, and compressed air can be released.
6. The heat exchange mechanism can store high-temperature compressed air into a downhole space after heat exchange is carried out to normal temperature, safety risks caused by high temperature are eliminated, meanwhile, the influence of large-amplitude change of air temperature on rock wall sealing quality is avoided, and the exchanged heat can be used for heating when gas is released.
Drawings
Fig. 1 is a schematic diagram of the overall arrangement of a system for storing energy by compressed air in a coal mine shaft and a roadway according to an embodiment of the invention.
FIG. 2 is a schematic partial view of a wellbore portion of a system for compressed air energy storage using a depleted coal mine in accordance with an embodiment of the present invention.
Fig. 3 is a schematic front view of a plugging mechanism according to an embodiment of the present invention.
Fig. 4 is a schematic top view of a plugging mechanism according to an embodiment of the present invention.
FIG. 5 is a partial schematic view of an upper section of an air intake mechanism according to an embodiment of the present invention.
Fig. 6 is a partial schematic view of an upper section of an air outlet mechanism according to an embodiment of the invention.
Fig. 7 is a partial schematic view of an upper section of a pressure monitoring mechanism according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention discloses a system for storing energy by compressed air using a scrapped coal mine, which includes a plugging mechanism 1, an air inlet mechanism 2, an air outlet mechanism 3, a pressure monitoring mechanism 4, a hydrological observation hole 5, a gas pressure monitoring hole (not shown), and a heat exchange mechanism (not shown).
The site selection of the plugging mechanism 1 is determined according to the roadway section, the rock stratum condition, the pressure and the like, in the embodiment, one plugging mechanism 1 is respectively arranged in a main well 6, an auxiliary well 7, a return air well 8, a first roadway 9, a second roadway 10, a third roadway 11, a fourth roadway 12 and a fifth roadway 13, the available space of a scrapped coal mine is plugged to form a closed gas storage space, the gas storage space comprises a bedrock section shaft located below a surface soil layer 14, a vehicle yard, a roadway, a chamber and the like arranged in the rock stratum, and the space which is difficult to use such as the surface soil section shaft, the roadway, the chamber and the like arranged in the coal seam or the space with safety risk is abandoned.
The gas inlet mechanism 2, the gas outlet mechanism 3 and the pressure monitoring mechanism 4 selectively enter from a main well 6, an auxiliary well 7 or a return air well 8 according to roadway sections, rock stratum conditions, pressure and the like; the air inlet mechanism 2 and the air outlet mechanism 3 can respectively inlet air and outlet air to the air storage space; the pressure monitoring mechanism 4 can monitor the pressure of the underground waste space adjacent to the gas storage space; well covers 15 are arranged on the well mouths of the main well 6, the auxiliary well 7 and the return air well 8, so that rainwater can be prevented from entering a shaft; the heat exchange mechanism is connected in the upper reaches of mechanism 2 that admits air, can carry out the heat exchange with high temperature compressed air and save into the space in the pit after to the normal atmospheric temperature, has eliminated the safety risk that the high temperature brought, has avoided air temperature to change the influence to the rock wall sealing quality by a wide margin simultaneously, and the heat of exchanging out can be used for heating when the gas release.
The hydrological observation holes 6 are arranged in the water-bearing stratum of the mining area, and one or more hydrological observation holes are arranged according to the distribution of the water-bearing stratum of the mining area; the gas pressure monitoring hole is arranged in a coal bed adjacent to a mine, namely the coal bed adjacent to the mine within the possible range of formation pressure transmission caused by high-pressure gas leakage; can monitor the underground hydrology situation of change through hydrology observation hole 6, through the gas pressure monitoring hole can monitor the gas pressure of the relevant coal seam of neighbouring mine, combines together the monitoring data of pressure monitoring mechanism 4 with the underground hydrology situation of change and the gas pressure of the relevant coal seam of neighbouring mine, can the comprehensive analysis store up the pressure in gas space and to the condition of transmitting of surrounding rock stratum, correspondingly judge the safety influence of formation pressure transmission to neighbouring mine gas occurrence and hydrology to in time take corresponding measure, the protection is close to mine safety production.
As shown in fig. 3 and 4, the plugging mechanism 1 includes a plugging wall 101 and an anchor rod 102; the plugging wall body 101 is of a truncated cone-shaped reinforced concrete structure, the large-diameter bottom surface of the plugging wall body faces to a low-pressure side, and the small-diameter bottom surface of the plugging wall body faces to a high-pressure side; the height of the plugging wall body 101 is determined according to the roadway section, lithology, pressure and the like, and is generally 5-10 m; a plurality of layers of anchor rods 102 are arranged at intervals along the height direction of the plugging wall body 101, and a plurality of anchor rods 102 on each layer are arranged in a circle along the circumferential direction of the plugging wall body 101; one part of the anchor rod 102 is fixedly connected in the plugging wall body 101, and the other part is fixedly connected in the surrounding rock.
As shown in fig. 2 and 5, the intake mechanism 2 includes an intake pipe 21, an intake monitoring unit 22, a first electric gate valve 23, a first manual gate valve 24, a first pressure release valve 25, a vent pipe 26, and a second manual gate valve 27; the gas inlet pipe 21 penetrates into the shaft from the top soil layer section, then penetrates through the plugging mechanism 1 in the shaft to enter the gas storage space, and the part of the gas inlet pipe 21 above the plugging mechanism 1 is fixedly connected with the shaft through the pipe supporting beam 16 and the bracket; the intake monitoring unit 22 comprises a first flow sensor 221, a first pressure sensor 222 and a first temperature sensor 223 which are arranged on the intake pipe 21, and is used for monitoring the intake flow, the intake pressure and the intake temperature, so that the energy storage safety is ensured; the air inlet pipe 21 is also provided with a first electric gate valve 23, a first manual gate valve 24 and a first pressure release valve 25, the first electric gate valve 23 is used for automatically controlling air inlet, the first manual gate valve 24 is used for overhauling the air inlet pipe 21, and the first pressure release valve 25 is used for performing overpressure protection on the air inlet pipe 21; one end of the emptying pipe 26 is connected with the middle section of the air inlet pipe 21 through a three-way joint, and the other end is communicated with the outside air; the second manual gate valve 27 is arranged on the emptying pipe 26, and when the internal condition of the air storage space needs to be checked, the air inlet is closed, the air outlet is opened, and the second manual gate valve 27 is opened, so that compressed air can be released.
As shown in fig. 2 and 6, the air outlet mechanism 3 includes an air outlet pipe 31, an air outlet monitoring unit 32, a second electric gate valve 33, a third manual gate valve 34, a second pressure release valve 35, and a filtering device 36; the gas outlet pipe 31 penetrates into the shaft from the top soil layer section, then penetrates through the plugging mechanism 1 in the shaft to enter the gas storage space, and the part of the gas outlet pipe 31 above the plugging mechanism 1 is fixedly connected with the shaft through the pipe supporting beam 16 and the bracket; the outlet monitoring unit 32 includes a second flow sensor 321, a second pressure sensor 322, a second temperature sensor 323, and a gas concentration sensor 324, which are arranged on the outlet pipe 31, and is used for monitoring the outlet flow, the outlet pressure, the outlet temperature, and the outlet gas concentration, so as to ensure energy storage safety; a second electric gate valve 33, a third manual gate valve 34 and a second pressure relief valve 35 are further arranged on the gas outlet pipe 31, the second electric gate valve 33 is used for automatically controlling gas outlet, the third manual gate valve 34 is used for overhauling the gas outlet pipe 31, and the second pressure relief valve 35 is used for performing overpressure protection on the gas outlet pipe 31; the gas outlet pipe 31 is further provided with a filtering device 36 for filtering dust, water vapor and the like in the well and protecting power generation devices such as a steam turbine and the like.
As shown in fig. 1, 2, and 7, the pressure monitoring mechanism 4 includes a pressure monitoring pipe 41, a third pressure sensor 42, and a fourth manual gate valve 43; the pressure monitoring pipe 41 penetrates into a shaft from a surface soil layer section, then penetrates through the plugging mechanism 1 in the shaft to enter the gas storage space, is divided into five branches, and respectively penetrates through the plugging mechanisms 1 in a first roadway 9, a second roadway 10, a third roadway 11, a fourth roadway 12 and a fifth roadway 13 to enter an underground waste space adjacent to the gas storage space, and the part, above the plugging mechanism 1 in the shaft, of the pressure monitoring pipe 41 is fixedly connected with the shaft through a pipe supporting beam 16 and a bracket; the pressure monitoring pipe 41 is provided with a third pressure sensor 42 which can monitor the pressure change condition of the underground waste space; the pressure monitoring pipe 41 is further provided with a fourth manual gate valve 43 for maintenance of the pressure monitoring pipe 41.
The embodiment of the invention also discloses a method for storing energy by utilizing the compressed air of the scrapped coal mine, and the system for storing energy by utilizing the compressed air of the scrapped coal mine comprises the following steps:
selecting available space of a scrapped coal mine, and selecting a bedrock section shaft below a topsoil layer 14 and a parking lot, a roadway, a chamber and the like arranged in a rock stratum;
analyzing the surrounding rock condition of the available space, and grouting and reinforcing the weak region of the surrounding rock;
step three, after the reinforcement is finished, the usable space is firstly lined with anti-seepage concrete and then is sealed by a stainless steel plate with the thickness of 0.5-2 mm;
after sealing is finished, blocking the shaft and roadways such as main transportation, auxiliary transportation, air return and the like leading to the mining area through the blocking mechanism 1, and blocking the available space to form a sealed air storage space; the plugging point in the shaft is arranged at the position of 10-50 m entering the bedrock section, and the plugging point in the roadway is arranged at the position of 50-100 m away from the coal roadway; the method comprises the following steps of arranging an air inlet mechanism 2, an air outlet mechanism 3, a pressure monitoring mechanism 4, a hydrological observation hole 5 and a gas pressure monitoring hole, and installing a well cover 15 at a well mouth;
step five, storing compressed air by using the air storage space, and continuously monitoring the safety influence of formation pressure transmission on the occurrence of gas and hydrology near a mine;
step six, when the internal condition of the air storage space needs to be checked, compressed air in the air storage space is released, then the first pressure release valve 25 or the second pressure release valve 35 is removed, and the unmanned aerial vehicle carries a camera and enters the air storage space through the air inlet pipe 21 or the air outlet pipe 31 for observation and checking;
and seventhly, when the surrounding rock needs to be locally processed at the later stage, grouting from the ground to perform reinforcement processing.
China is a big coal producing country, has a large number of coal mines which are scrapped or are about to be scrapped due to resource exhaustion, is relatively widely distributed, and particularly in northern plain areas inconvenient for pumping water and storing energy, the utilization of the abandoned coal mines for compressed air energy storage can effectively solve the economic and social problems after the mine is scrapped and withdrawn, and can eliminate abandoned light and abandoned wind, thereby providing key support for the stable wind of a power grid and the healthy development of light power generation; in addition, the huge underground space of the abandoned coal mine can realize long-time and high-power storage and release, and the investment and operation cost can be saved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a system for utilize scrapped coal mine to carry out compressed air energy storage which characterized in that: the underground coal mine gas pressure monitoring device comprises a plugging mechanism, a gas inlet mechanism, a gas outlet mechanism, a pressure monitoring mechanism, a hydrological observation hole and a gas pressure monitoring hole, wherein the plugging mechanism plugs available space of scrapped coal mines to form a closed gas storage space, the gas inlet mechanism and the gas outlet mechanism can respectively control gas inlet and gas outlet of the gas storage space, the pressure monitoring mechanism can monitor pressure of underground abandoned space adjacent to the gas storage space, the hydrological observation hole is formed in a water-bearing stratum of a mining area, and the gas pressure monitoring hole is formed in a related coal seam of an adjacent mine.
2. The system of claim 1 for storing energy in compressed air from a coal mine end-of-life, wherein: the air inlet mechanism comprises an air inlet pipe and an air inlet monitoring unit, the air inlet pipe penetrates into the air storage space, and the air inlet monitoring unit comprises a first flow sensor, a first pressure sensor and a first temperature sensor which are arranged on the air inlet pipe; the gas outlet mechanism comprises a gas outlet pipe and a gas outlet monitoring unit, the gas outlet pipe penetrates into the gas storage space, and the gas outlet monitoring unit comprises a second flow sensor, a second pressure sensor, a second temperature sensor and a gas concentration sensor which are arranged on the gas outlet pipe.
3. The system for storing energy in compressed air using a scrapped coal mine of claim 2, wherein: still be provided with first electric gate valve and first manual gate valve in the intake pipe, still be provided with second electric gate valve and third manual gate valve on the outlet duct.
4. The system for storing energy in compressed air using a scrapped coal mine of claim 2, wherein: the air inlet pipe is further provided with a first pressure relief valve, and the air outlet pipe is further provided with a second pressure relief valve.
5. A system for storing energy in compressed air using a coal mine end-of-life as claimed in claim 2, wherein: the air inlet mechanism also comprises a blow-down pipe and a second manual gate valve; one end of the emptying pipe is connected with the middle section of the air inlet pipe, and the other end of the emptying pipe is communicated with outside air; and a third manual gate valve is arranged on the emptying pipe.
6. The system for storing energy in compressed air using a scrapped coal mine of claim 2, wherein: and the air outlet pipe is also provided with a filtering device.
7. The system of claim 1 for storing energy in compressed air from a coal mine end-of-life, wherein: the pressure monitoring mechanism comprises a pressure monitoring pipe, a third pressure sensor and a fourth manual gate valve, the pressure monitoring pipe penetrates into the underground waste space adjacent to the gas storage space, and the third pressure sensor and the fourth manual gate valve are arranged on the pressure monitoring pipe.
8. The system for storing energy in compressed air using a scrapped coal mine of claim 1, wherein: the plugging mechanism comprises a plugging wall body and an anchor rod; the plugging wall body is of a truncated cone-shaped reinforced concrete structure, the large-diameter bottom surface of the plugging wall body faces to the low-pressure side, and the small-diameter bottom surface of the plugging wall body faces to the high-pressure side; a plurality of layers of anchor rods are arranged at intervals along the height direction of the plugging wall body, and a plurality of anchor rods on each layer are arranged into a circle along the circumferential direction of the plugging wall body; one part of the anchor rod is fixedly connected in the plugging wall body, and the other part of the anchor rod is fixedly connected in the surrounding rock.
9. The system for storing energy in compressed air using a scrapped coal mine of claim 1, wherein: the system also includes a heat exchange mechanism connected upstream of the air intake mechanism.
10. A method for storing energy by utilizing compressed air of a scrapped coal mine is characterized by comprising the following steps: a system for storing energy in compressed air using a scrapped coal mine as claimed in any one of claims 1 to 9, comprising the steps of:
selecting available space of a scrapped coal mine;
analyzing the surrounding rock condition of the available space, and grouting and reinforcing the surrounding rock weak area;
step three, after the reinforcement is finished, firstly lining the usable space with anti-leakage concrete, and then lining the usable space with a stainless steel plate for sealing;
after sealing is finished, plugging the available space through a plugging mechanism to form a sealed gas storage space, and arranging a gas inlet mechanism, a gas outlet mechanism, a pressure monitoring mechanism, a hydrological observation hole and a gas pressure monitoring hole;
step five, storing compressed air by using the air storage space, and continuously monitoring the safety influence of formation pressure transmission on the occurrence of gas and hydrology near a mine;
step six, when the internal condition of the air storage space needs to be checked, compressed air in the air storage space is released first, and then the unmanned aerial vehicle carries a camera to enter the air storage space for observation and checking;
and seventhly, when the surrounding rock needs to be locally processed at the later stage, grouting from the ground to perform reinforcement processing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116312188A (en) * | 2023-03-10 | 2023-06-23 | 中国矿业大学 | Model device for simulating operation of abandoned mine compressed air energy storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116312188A (en) * | 2023-03-10 | 2023-06-23 | 中国矿业大学 | Model device for simulating operation of abandoned mine compressed air energy storage system |
| CN116312188B (en) * | 2023-03-10 | 2023-10-20 | 中国矿业大学 | Model device for simulating operation of abandoned mine compressed air energy storage system |
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