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EP-4545838-B1 - SEALED UNDERGROUND ENERGY STORAGE CHAMBER AND SEALED UNDERGROUND ENERGY STORAGE CHAMBER SYSTEM COMPRISING THE SAME

EP4545838B1EP 4545838 B1EP4545838 B1EP 4545838B1EP-4545838-B1

Inventors

  • LIU, FUCAI
  • XIAO, MIN
  • CUI, Haibo
  • OU, Mingfu

Dates

Publication Date
20260513
Application Date
20240326

Claims (14)

  1. A sealed underground energy storage chamber, comprising a sealed underground energy storage chamber body (2); the sealed underground energy storage chamber body (2) has a compound sealing layer; the compound sealing layer comprises, sequentially along a radial direction from a perimeter of the sealed underground energy storage chamber body (2) towards a central axis of the sealed underground energy storage chamber body (2), a compound concrete sealing layer (10) and a sealing liner layer (300); the compound concrete sealing layer (10) at least comprises one casted ultra-high-performance concrete layer (200); the sealing liner layer (300) is attached to an inner surface of the casted ultra-high-performance concrete layer (200); a thickness of the casted ultra-high-performance concrete layer (200) is 40-80 mm, a compressive strength of the casted ultra-high-performance concrete layer (200) is greater than 150 Mpa, a gas permeability of the casted ultra-high-performance concrete layer (200) is 1 × 10 -18 m 2 to 5 × 10 -19 m 2 , and an initial cracking strain of the casted ultra-high-performance concrete layer(200) is greater than 1000 µε; characterized in that : the compound concrete sealing layer (10) further comprises a self-stressing sprayed concrete layer (100); the self-stressing sprayed concrete layer (100) and the casted ultra-high-performance concrete layer (200) are sequentially laminated layers laminated along the radial direction from the perimeter of the sealed underground energy storage chamber body (2) towards the central axis of the sealed underground energy storage chamber body (2).
  2. The sealed underground energy storage chamber of claim 1, wherein a plurality of first fasteners (400) are provided in the compound concrete sealing layer (10).
  3. The sealed underground energy storage chamber of claim 2, wherein the first fasteners (400) are anchoring members which are in rod shape; each of the anchoring members has a diameter of 20-30 mm, and/or each of the anchoring members has a length of 920-1520 mm, and/or the anchoring members are spaced apart from one another by an interval of 1000-2000 mm.
  4. The sealed underground energy storage chamber of claim 2, wherein a plurality of second fasteners (500) are provided between the sealing liner layer (300) and the casted ultra-high-performance concrete layer (200).
  5. The sealed underground energy storage chamber of claim 4, wherein the second fasteners (500) are V-shaped anchoring members; the V-shaped anchoring members pass through the sealing liner layer (300) and then being embedded into the casted ultra-high-performance concrete layer (200), such that the sealing liner layer (300) is attached to the inner surface of the casted ultra-high-performance concrete layer (200).
  6. The sealed underground energy storage chamber of claim 1, wherein a thickness of the self-stressing sprayed concrete layer (100) is 80-400 mm, and/or self-stressing of the self-stressing sprayed concrete layer (100) is not less than 1 Mpa, and/or a compressive strength of the self-stressing sprayed concrete layer (100) is not less than 40 Mpa.
  7. The sealed underground energy storage chamber of claim 1, wherein the self-stressing sprayed concrete layer (100) is formed as an ultra-high-performance self-stressing sprayed concrete layer (700).
  8. The sealed underground energy storage chamber of claim 7, wherein a thickness of the ultra-high-performance self-stressing sprayed concrete layer (700) is 80-120 mm.
  9. The sealed underground energy storage chamber of any one of claims 1, 6-8, wherein a first steel reinforcing mesh layer (110) is provided inside the self-stressing sprayed concrete layer (100); a volume of the first steel reinforcing mesh layer (110) being used is not less than 1.5% of a volume of the self-stressing sprayed concrete layer (100), and/or the first steel reinforcing mesh layer (110) comprises a plurality of first steel reinforcement bars (111) where a diameter of each of the first steel reinforcement bars (111) is 8-12 mm, and/or the first steel reinforcing mesh layer (110) is formed as a first grid where each side length of each grid unit (112) of the first grid is 100-300 mm; and/or a thickness of a protective layer (120) of the first steel reinforcing mesh layer (110) is 30-50 mm, wherein the protective layer (120) of the first steel reinforcing mesh layer (110) is a portion of the self-stressing sprayed concrete layer (100) extending from the first steel reinforcing mesh layer (110) to an outer side surface of the self-stressing sprayed concrete layer (100).
  10. The sealed underground energy storage chamber of claim 9, wherein a second steel reinforcing mesh layer (210) is provided inside the casted ultra-high-performance concrete layer (200); a volume of the second steel reinforcing mesh layer (210) being used is not less than 1.5% of a volume of the casted ultra-high-performance concrete layer (200), and/or the second steel reinforcing mesh layer (210) comprises a plurality of second steel reinforcement bars (211) whereas a diameter of each of the second steel reinforcement bars (211) is 4-10 mm, and/or the second steel reinforcing mesh layer (210) is formed as a second grid where each side length of each grid unit (212) of the second grid (212) is 100-300 mm, and/or a thickness of a protective layer (211) of the second steel reinforcing mesh layer (210) is 25-40 mm, wherein the protective layer (211) of the second steel reinforcing mesh layer (210) is a portion of the casted ultra-high-performance concrete layer (200) extending from the second steel reinforcing mesh layer (210) to an outer side surface of the casted ultra-high-performance concrete layer (200).
  11. The sealed underground energy storage chamber of any one of claims 1 to 10, wherein the sealing liner layer (300) is formed as a high-density polyethylene layer.
  12. The sealed underground energy storage chamber of claim 11, wherein a thickness of the high-density polyethylene layer is 4-6 mm, and/or a yield strength of the high-density polyethylene layer is not less than 30 Mpa, and/or a maximum tensile strength of the high-density polyethylene layer is not less than 50 Mpa, and/or a thermal resistance range of the high-density polyethylene layer is from -50 °C to 90 °C.
  13. The sealed underground energy storage chamber of any one of claims 1 to 10, wherein the sealed underground energy storage chamber body (2) comprises a hollow cylindrical portion (21) and a hemispherical end portion (22) at each of two ends of the hollow cylindrical portion (21); the hollow cylindrical portion (21) and each hemispherical end portion (22) are provided with the compound sealing layer.
  14. A sealed underground energy storage chamber system, comprising at least two sealed underground energy storage chambers each being defined in any one of claims 1 to 10; said at least two sealed underground energy storage chambers are arranged parallel to each other and are mutually spaced apart from each other along radial directions of cross sections of said at least two sealed underground energy storage chambers; a connecting member (600) is provided between sealed underground energy storage chamber bodies (2) of every two adjacent sealed underground energy storage chambers to connect the two adjacent sealed underground energy storage chambers.

Description

Technical Field The present invention relates to the technical field of energy storage, and in particular, to a sealed underground energy storage chamber and a sealed underground energy storage chamber system comprising the same. Background Art Energy is the driving force for the development of human society. In the evolution of human society, with the continuous progress of productivity and the use of modern high technologies, the demand for energy is also increasing. Yet, human society is threatened by energy crises and energy exhaustion due to excessive exploitation, and the environment of the earth is further worsened by pollution caused by the increasing use of dirty energies. These problems have aroused people's attention since a long time ago. The development of new environment-friendly energies becomes important in applied science, and the method of energy storage is also people's main focus of concern. Air, hydrogen, and natural gas can be used as an energy storage medium. Compressed gas energy storage is a means for electrical power energy storage having advantages such as large capacity, long storage period, cost-efficiency, and a large number of charge-discharge cycles, so it is a practical way to help achieve deep de-carbonization in different fields such as energy, transportation, and petrochemistry. However, the storage of compressed gases is technologically challenging, especially in large quantities. At present, conventional compressed gas storage can be mainly divided into overground storage and underground storage. Overground storage mainly involves small-scale steel tank storage, disadvantageous in limited capacity, high cost, and high safety risk. An underground storage tank comprises a concrete liner layer and a steel plate sealing layer, but with greater diameter of the storage tank, a thicker wall for bearing pressure is required, thereby increasing the difficulties and costs of manufacturing and welding the steel plates; further, there is a risk of explosion when the steel plate sealing layer fails to perform its proper functions. Prior art US2022325852 discloses a tank for storing pressurized gas. The tank comprises at least one tubular element having a wall comprising a layer of prestressed concrete, at least one circumferential mechanical reinforcing layer, at least one axial mechanical reinforcing layer and a sealing layer. The concrete from which the layer of prestressed concrete is made is chosen from ultra-high performance fiber-reinforced concretes. Non-patent literature "Numerical simulation on cavern support of compressed air energy storage(CAES) considering thermos-mechanical coupling effect" by LIU XINYU et al. published 2 September 2023 in ENERGY, ELSEVIER, AMSTERDAM, NL, Vol. 282 discloses ultra-high performance concrete (UHPC) and high-temperature resistant polyethylene being used for structural support and tightness of caverns excavated in hard rock. Laboratory experiments were conducted to investigate the fatigue tensile and compressive behavior of UHPC, and a fatigue damage constitutive model for UHPC was established. A two-dimensional precise thermal-mechanical coupled dynamic model of long-term CAES was developed by the finite element method. Stress and damage evolution of the UHPC lining for both short and long term have been stated, and the extent of crack propagation was evaluated. The numerical result proves that the qualities of rock have significant effect on stabilities of CAES. Also, transient heat transfer equations and energy balance were used to analyze the heat transfer for CAES, which showed that the thermal stress caused by temperature variation would cause an increment of tensile stress in UHPC lining, and the energy loss rate would decrease to a certain level during CAES cycles. The literature provides a method for the design of CAES. Disclosure of the Invention The present invention is intended to overcome at least one defect of the prior arts, and it is an object of the present invention to provide a sealed underground energy storage chamber for solving the problems of excessive thickness and poor airtightness of the sealing structure layer in a prior art underground energy storage chamber. The present invention adopts the following technical solutions: A sealed underground energy storage chamber, comprising a sealed underground energy storage chamber body; the sealed underground energy storage chamber body has a compound sealing layer; the compound sealing layer comprises, sequentially along a radial direction from a perimeter of the sealed underground energy storage chamber body towards a central axis of the sealed underground energy storage chamber body, a compound concrete sealing layer and a sealing liner layer; the compound concrete sealing layer at least comprises one casted ultra-high-performance concrete layer; the sealing liner layer is attached to an inner surface of the casted ultra-high-performance concrete layer; a thickness of the