Telescopic multi-layer cavity compressed air energy storage underground chamber

Abstract

The utility model provides a telescopic multi-layer cavity compressed air energy storage underground chamber. The telescopic multi-layer cavity compressed air energy storage underground chamber comprises a reinforced concrete lining and a partial pressure diaphragm system. Wherein the partial pressure diaphragm system comprises a flexible diaphragm I and a flexible diaphragm II; a telescopic corrugated steel lining and a thermoplastic elastic sealing film are sequentially arranged in an inner cavity of the reinforced concrete lining from outside to inside, and the first flexible diaphragm and the second flexible diaphragm are arranged in the vertical direction of the chamber. The edges of the first flexible diaphragm and the second flexible diaphragm are each provided with an electromagnetic valve. And each electromagnetic valve is connected with an external control system. Through the telescopic lining layer and the pressure response device, the volume of the cavity can be dynamically adjusted along with air pressure, and the energy storage density is improved; the airflow path is controlled through the partition diaphragm, and the energy release efficiency is optimized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compressed air energy storage technical field, concretely relates to a telescopic multilayer cavity compressed air energy storage underground chamber. BACKGROUND

[0002] In prior art, the compressed air energy storage chamber of fixed form has the following defects: low energy storage density: the cavity volume is not variable, cannot adapt to the pressure fluctuation in the process of charging / discharging, resulting in limited effective energy storage space; the sealing structure is easy to fail: the traditional steel lining or concrete lining is easy to produce fatigue cracks under high pressure circulation; serious heat loss: the compression heat is not effectively recovered, and the overall efficiency of the system is reduced. SUMMARY

[0003] To solve the above problems, the application discloses a telescopic multilayer cavity compressed air energy storage underground chamber, which realizes dynamic adjustment of cavity volume with air pressure through telescopic inner lining and pressure response device, and improves energy storage density; the airflow path is controlled by partitioning diaphragm, and the energy release efficiency is optimized.

[0004] A telescopic multilayer cavity compressed air energy storage underground chamber, comprising a reinforced concrete lining and a pressure separation membrane system; wherein the pressure separation membrane system comprises a flexible diaphragm one and a flexible diaphragm two; the inner cavity of the reinforced concrete lining is provided with a telescopic corrugated steel bushing and a thermoplastic elastic sealing film from outside to inside in sequence, and the flexible diaphragm one and the flexible diaphragm two are arranged along the vertical direction of the chamber respectively; the edges of the flexible diaphragm one and the flexible diaphragm two are provided with electromagnetic valves; and each electromagnetic valve is connected with an external control system.

[0005] Further, the outer surface of the reinforced concrete lining is embedded with a plurality of anchor rods fixed with surrounding rock, thereby providing overall support.

[0006] Further, the telescopic corrugated steel bushing realizes axial telescoping through a hydraulic drive device.

[0007] Further, the corrugation depth of the telescopic corrugated steel bushing is 50-100mm, and the corrugation spacing is 200mm.

[0008] Further, the thermoplastic elastic sealing film is pre-embedded with microcapsules at the joint with the telescopic corrugated steel bushing.

[0009] Further, the hydraulic drive device is arranged axially along the telescopic corrugated steel bushing, and each telescopic corrugated steel bushing corresponds to an independent hydraulic unit.

[0010] Working principle of the utility model:

[0011] 1. The telescopic corrugated steel liner realizes axial telescoping through a hydraulic drive device; wherein a thermoplastic elastomeric sealing film is bonded with the telescopic corrugated steel liner to form an airtight layer; a flexible diaphragm; the cavity is divided into high-pressure, medium-pressure and low-pressure zones; the flexible diaphragm edge is installed with an electromagnetic valve, and the opening degree is adjusted through an external control system to control the airflow path.

[0012] 2. Microcapsules 10 are embedded at the joint between the thermoplastic elastomeric sealing film and the telescopic corrugated steel liner, and the microcapsules contain low-melting repair agents (such as modified asphalt); when the friction temperature rises to 80-100℃ due to air pressure fluctuation, the microcapsules rupture to release the repair agent to fill the microcracks.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. Dynamic cavity adjustment system: through the telescopic inner liner and the pressure response device, the cavity volume is dynamically adjusted with the air pressure, and the energy storage density is improved;

[0015] 2. Multi-layer pressure distribution structure: the chamber is divided into high-pressure, medium-pressure and low-pressure zones, the airflow path is controlled through the partition diaphragm, and the energy release efficiency is optimized;

[0016] 3. Self-repairing sealing technology: thermoplastic elastomer material is embedded between the telescopic layers, and the air pressure change triggers local melting to fill the microcracks. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The utility model discloses a longitudinal section structure schematic diagram;

[0018] Fig. 2 The utility model discloses a transverse section structure schematic diagram.

[0019] LIST OF REFERENCE NUMERALS

[0020] Wherein 1 is reinforced concrete lining; 2 is anchor rod; 3 is telescopic corrugated steel liner; 4 is hydraulic drive device; 5 is thermoplastic elastomeric sealing film; 6 is flexible diaphragm one; 7 is flexible diaphragm two; 8 is electromagnetic valve; 9 is external control system. DETAILED DESCRIPTION

[0021] The application will be further illustrated below in conjunction with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the application and not to limit the scope of the application. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "in" and "out" refer to the directions towards or away from the geometric center of a particular component.

[0022] As Figs. 1-2As shown, the embodiment of the scalable multi-layer cavity compressed air energy storage underground chamber includes a reinforced concrete lining 1 and a pressure separation membrane system; wherein the pressure separation membrane system includes flexible membrane one 6 and flexible membrane two 7; the inner cavity of the reinforced concrete lining 1 is sequentially provided with a scalable corrugated steel liner 3 and a thermoplastic elastic sealing film 5 from outside to inside, and the flexible membrane one 6 and the flexible membrane two 7 are arranged along the vertical direction of the chamber respectively; the edges of the flexible membrane one 6 and the flexible membrane two 7 are both provided with electromagnetic valves 8; each of the electromagnetic valves 8 is connected with an external control system 9.

[0023] The outer surface of the reinforced concrete lining 1 is embedded with a plurality of anchor rods 2 fixed with surrounding rock; the scalable corrugated steel liner 3 realizes axial expansion and contraction through a hydraulic drive device 4. The thermoplastic elastic sealing film 5 is pre-embedded with microcapsules 10 at the joint with the scalable corrugated steel liner 3.

[0024] The specific test scheme is as follows:

[0025] I. Chamber main structure

[0026] Layered lining design: outer layer: reinforced concrete lining 1, thickness 1.5-2m, embedded with anchor rods 2 fixed with surrounding rock, providing overall support; middle layer: scalable corrugated steel liner 3 made of high-strength alloy steel, corrugated depth 50-100mm, corrugated pitch 200mm, realizing axial expansion and contraction through a hydraulic drive device 4 (expansion and contraction stroke is 10%-15% of the total length of the cavity); inner layer: thermoplastic elastic sealing film 5, thickness 10mm, melting point 120-150℃, bonded with the corrugated steel liner, forming an airtight layer.

[0027] Pressure separation membrane system: two layers of flexible membranes 6, 7 are arranged in the vertical direction of the chamber, made of aramid fiber reinforced rubber material, tensile strength ≥50MPa; the membranes divide the cavity into high-pressure, medium-pressure and low-pressure zones; the edges of the membranes are provided with electromagnetic valves 8, and the opening degree is adjusted through an external control system 9 to control the airflow path.

[0028] II. Dynamic adjustment process

[0029] Hydraulic drive module: hydraulic drive devices 4 are arranged along the axial direction of the corrugated steel liner, and each section of corrugated steel liner corresponds to an independent hydraulic unit; when inflated, the hydraulic cylinder pushes the corrugated steel liner to expand (volume increases), and when deflated, the hydraulic cylinder contracts (volume decreases).

[0030] Pressure response control logic: inflation stage: when the air pressure in the high-pressure zone reaches the set threshold (such as 8MPa), the control system opens the electromagnetic valves in the medium-pressure zone, and the airflow gradually expands; deflation stage: the air in the low-pressure zone is preferentially extracted, and the output air pressure is maintained stable (fluctuation ≤±0.5MPa) by adjusting the opening degree of the membranes.

[0031] III. Self-repairing sealing and thermal management

[0032] Self-repairing sealing technology: embedding microcapsules 10 containing low-melting repair agent (such as modified asphalt) at the joint between the thermoplastic elastomer sealing film 5 and the stretchable corrugated steel liner 3; when the air pressure fluctuation causes the temperature to rise to 80-100℃, the microcapsules break and release the repair agent to fill the microcracks.

[0033] Heat recovery system: applying a layer of phase change material on the outer wall of the stretchable corrugated steel liner 3, using paraffin / expanded graphite composite material with a phase change temperature of 60-80℃; the compression heat is stored by the phase change material, and the heat is recovered by the heat exchanger during the air release stage to preheat the expander inlet air.

[0034] Four, implementation process

[0035] Construction phase: excavate the chamber and pour the outer layer of reinforced concrete lining 1; segmentally hoist the prefabricated stretchable corrugated steel liner 3, connect the hydraulic drive device 4, spray the thermoplastic elastomer sealing film 5, install the flexible diaphragm 1 6, the flexible diaphragm 2 7 and the electromagnetic valve 8.

[0036] Operation phase: air charging and energy storage: the compressor injects air into the high-pressure area, the hydraulic drive expands the corrugation, and the volume expands to 110%-115%; when the air pressure reaches 8MPa, the low-pressure area diaphragm opens, and the air continues to be filled to 12MPa; the sealing film friction temperature triggers the release of the microcapsule repair agent. Air release and energy release: the low-pressure area diaphragm is opened first, the expander extracts air to generate electricity; the hydraulic drive corrugation shrinks to the initial volume of 80%, maintaining stable air pressure; the phase change material releases heat to preheat the expander inlet air temperature to 40-50℃.

[0037] The technical means disclosed in the present application scheme are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A retractable multi-cavity compressed air energy storage underground chamber, characterized in that: It includes a reinforced concrete lining (1) and a pressure-distributing diaphragm system; wherein the pressure-distributing diaphragm system includes a flexible diaphragm one (6) and a flexible diaphragm two (7); the inner cavity of the reinforced concrete lining (1) is provided with a retractable corrugated steel bushing (3) and a thermoplastic elastic sealing membrane (5) from the outside to the inside; the flexible diaphragm one (6) and the flexible diaphragm two (7) are respectively arranged along the vertical direction of the chamber; the edges of the flexible diaphragm one (6) and the flexible diaphragm two (7) are each equipped with a solenoid valve (8); each of the solenoid valves (8) is connected to an external control system (9).

2. The retractable multi-cavity compressed air energy storage underground chamber according to claim 1, characterized in that: Several anchor rods (2) fixed to the surrounding rock are embedded in the outer surface of the reinforced concrete lining (1).

3. The retractable multi-cavity compressed air energy storage underground chamber according to claim 1, characterized in that: The retractable corrugated steel bushing (3) achieves axial extension and retraction through a hydraulic drive device (4).

4. A retractable multi-cavity compressed air energy storage underground chamber according to claim 1, characterized in that: The corrugated depth of the retractable corrugated steel bushing (3) is 50-100mm, and the corrugation spacing is 200mm.

5. A retractable multi-cavity compressed air energy storage underground chamber according to claim 1, characterized in that: Microcapsules (10) are pre-embedded at the joint between the thermoplastic elastic sealing film (5) and the stretchable corrugated steel bushing (3).

6. A retractable multi-cavity compressed air energy storage underground chamber according to claim 3, characterized in that: A hydraulic drive device (4) is arranged along the axial direction of the retractable corrugated steel bushing (3), with each section of the retractable corrugated steel bushing (3) corresponding to an independent hydraulic unit.

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