CN-121977157-A - Underground compressed gas energy storage sealing system and construction method

CN121977157ACN 121977157 ACN121977157 ACN 121977157ACN-121977157-A

Abstract

The invention provides an underground compressed gas energy storage sealing system and a construction method, the method comprises the following steps of firstly determining that a lining is a steel lining according to at least one of material toughness, material ductility, fatigue damage resistance, construction environment requirements and construction period of the lining, secondly coating solvent-free liquid epoxy coatings on two sides of the steel lining respectively, wherein the thickness of the solvent-free liquid epoxy coatings is more than or equal to 600 mu m, thirdly arranging a plurality of bolts on an embedded plate, enabling the embedded plate to meet the requirement of compressive stress, fourthly arranging a circular structure with a corrugated section of the lining along the length direction of the lining, and fifthly detecting the bearing capacity of welding seams between the embedded plates and between the lining to determine whether the sealing performance of the embedded plate and the lining is good. The sealing performance of the sealing system of the rock cavern can be ensured by the method of the embodiment.

Inventors

LI YIN
Xing Zepeng
XU JIE
NIU QUN
NISHIHARA
HE YANG
PENG CHANGFEI
CHEN XUEJIAN
CUI SHAODONG
BI GUANGHUI
MENG JIAN
Liang jiuzheng
GUO SHUTAI
DING CHAO

Assignees

中国石油天然气管道工程有限公司
中国石油天然气集团有限公司
中国石油管道局工程有限公司

Dates

Publication Date: 20260505
Application Date: 20241031

Claims (10)

1. A method of constructing an underground compressed gas energy storage seal system, the method comprising the steps of: step one, determining the lining to be a steel lining according to at least one of the toughness, the ductility, the fatigue failure resistance, the construction environment requirement and the construction period of the lining; Respectively coating solvent-free liquid epoxy coatings on two sides of the steel lining, wherein the thickness of the solvent-free liquid epoxy coating is more than or equal to 600 mu m; step three, arranging a plurality of bolts 30 on the embedded plate, wherein the embedded plate meets the requirement of compressive stress; arranging a compensation corrugated plate along the length direction of the lining, wherein the section of the compensation corrugated plate along the radial direction of the lining is of a corrugated circular structure; And fifthly, detecting the bearing capacity of welding seams between the embedded plates and between the inner liners, and determining whether the sealing performance of the embedded plates and the inner liners is good.
2. The method of constructing an underground compressed gas energy storage seal system of claim 1, wherein the determining the liner as a steel liner according to at least one of material toughness, material ductility, fatigue failure resistance, construction environment requirements, and construction cycle of the liner comprises: According to the method, the construction period of the glass fiber reinforced plastic lining is larger than that of the steel lining, and/or the construction cost of the glass fiber reinforced plastic lining is larger than that of the steel lining, and/or the toughness of the glass fiber reinforced plastic lining is smaller than that of the steel lining, and/or the ductility of the glass fiber reinforced plastic lining is smaller than that of the steel lining, and/or the steel lining is determined according to the fatigue failure resistance of the glass fiber reinforced plastic lining being smaller than that of the steel lining.
3. The method of constructing an underground compressed gas energy storage seal system according to claim 2, wherein the liner is determined to be a steel liner according to a construction period of the glass fiber reinforced plastic liner being 1.5 to 2.5 times a construction period of the steel liner and according to a construction cost of the glass fiber reinforced plastic liner being 2.5 to 3.5 times a construction cost of the steel liner.
4. The method of claim 1, wherein the thickness of the solvent-free liquid epoxy coating of the steel lining disposed at the bottom of the cavity is greater than the thickness of the solvent-free liquid epoxy coating of the steel lining disposed at the side wall of the cavity.
5. The method of constructing an underground compressed gas energy storage seal system of claim 1, wherein the pre-buried plate meets the compressive stress requirement, specifically comprising: the calculation formula of the circumferential compressive stress of the embedded plate is as follows: σ=Ε·ε wherein sigma is the compression stress of the embedded plate, MPa, E is the elastic modulus of the steel plate, MPa and epsilon is the strain.
6. The method of constructing an underground compressed gas energy storage seal system of claim 1, wherein the pre-buried plate meets the compressive stress requirement, specifically comprising: the axial compressive stress of the embedded plate is calculated as follows: wherein Cc is buckling slenderness ratio, E is elastic modulus of the steel plate, MPa, and m is intermediate coefficient; the calculation formula of the buckling slenderness ratio Cc is as follows: wherein K is an effective buckling length coefficient; wherein, the calculation formula of the intermediate coefficient m is as follows: S is the interval of bolts 30 on the embedded plate, and mm, r is the inertia radius of the embedded plate, and mm; The calculation formula of the section inertia radius r of the embedded plate is as follows: Wherein I is the moment of inertia of the embedded plate, mm 4 , A is the sectional area of the embedded plate, and mm 2 ; section inertia of embedded plate the moment calculation formula is as follows: Wherein b is the width of the embedded plate, mm, and h is the thickness of the embedded plate, mm.
7. The method of constructing an underground compressed gas energy storage seal system of claim 1, wherein compensating corrugated plates are provided along the length direction of the liner, and the compensating corrugated plates have a corrugated circular structure in cross section along the radial direction of the liner, and specifically comprising: The cross-section of compensation buckled plate sets up to circular structure along the length direction of perpendicular to inside lining, including a plurality of ripple on the circular structure, a plurality of the ripple is along circular structure's circumference interval and evenly arranged, and adjacent two contained angle between the ripple is 10, the ripple to the center of inside lining is evagination form.
8. The method of claim 7, wherein an analysis model of the liner with a corrugated circular structure is built, the stress condition of the analysis model of the liner under the action of the internal pressure is calculated, and the parameters of the corrugated circular shape of the liner are determined safely according to the stress condition.
9. The method for constructing an underground compressed gas energy storage sealing system according to claim 1, wherein the detecting the bearing capacity of the weld between the embedded plates and between the inner liners, determining whether the sealing performance between the embedded plates and the inner liners is good, specifically comprises: And judging that the sealing performance of the underground compressed gas energy storage sealing system is good according to the fact that each welding line is free of obvious flaws after visual inspection, the grade I of each welding line qualification grade of the butt welding line between the embedded plates and the lap welding line between the lining plates is detected according to penetration, and the minimum vacuum test pressure of the fillet welding line between the lining plates of the lining and the embedded plates is 53KPa (G).
10. An underground compressed gas energy storage seal system constructed according to the method of constructing an underground compressed gas energy storage seal system according to any one of claims 1 to 9, the underground compressed gas energy storage seal system comprising: The lining is arranged along the inner wall of the cave depot, the lining is made of flexible steel, solvent-free liquid epoxy coatings are respectively coated on two sides of the lining, and the thickness of the solvent-free liquid epoxy coatings is more than or equal to 600 mu m; The corrugated compensation plate is of a corrugated circular structure along the section of the length direction of the lining, a plurality of corrugations are formed on the corrugated compensation plate, and an included angle between two adjacent corrugations is 10 degrees; the embedded plate is arranged on one side of the lining, which is away from the hole warehouse; the bolts are connected with the embedded plates and the lining, and the bolts are evenly distributed along the circumferential direction of the lining at intervals.

Description

Underground compressed gas energy storage sealing system and construction method Technical Field The embodiment of the disclosure belongs to the technical field of underground energy storage, and particularly relates to an underground compressed gas energy storage sealing system and a construction method. Background Research on compressed air energy storage is gradually increased in recent years, research and development time is too short, mature cases are few, and although some research results are achieved, market tests are not passed, and systematic research is generally lacking. At present, only the national test demonstration project of salt cavern CAES of 60MW/300 MW.h of Jiangsu gold altar is put into commercial operation, but salt cavern type compressed air energy storage warehouse must select salt ores with proper burial depth, certain thickness and higher purity, and site selection is extremely limited. Although the salt mine resources in China are rich, the salt mine mainly comprises land-phase-caused salt mine, the salt mine has large burial depth, thin salt layers, more interlayers and high impurity content, the resources suitable for library construction are very limited, and currently, through multiple rounds of carding, the salt mine capable of library construction has only limited places such as gold jars and the like, and is pushed slowly except the gold jars, so that the rapidly-increased gas storage construction requirements in China cannot be met. The salt cavern cavity is matched with a certain halogen water treatment plant, so that the construction speed is limited to a great extent. The cave type compressed air energy storage warehouse only needs to select a hard and complete rock mass, but the tightness of the compressed air energy storage warehouse is difficult to ensure. In view of the foregoing, there is a need to create an underground compressed air energy storage seal system and method of constructing the same that ensures the tightness of the compressed air energy storage reservoir. Disclosure of Invention Embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide an underground compressed gas energy storage sealing system and a construction method thereof. An embodiment of an aspect of the present disclosure provides a method of constructing an underground compressed gas energy storage seal system, the method comprising the steps of: step one, determining the lining to be a steel lining according to at least one of the toughness, the ductility, the fatigue failure resistance, the construction environment requirement and the construction period of the lining; Respectively coating solvent-free liquid epoxy coatings on two sides of the steel lining, wherein the thickness of the solvent-free liquid epoxy coating is more than or equal to 600 mu m; Arranging a plurality of bolts on the embedded plate, wherein the embedded plate meets the requirement of compressive stress; arranging a compensation corrugated plate along the length direction of the lining, wherein the section of the compensation corrugated plate along the radial direction of the lining is of a corrugated circular structure; And fifthly, detecting the bearing capacity of welding seams between the embedded plates and between the inner liners, and determining whether the sealing performance of the embedded plates and the inner liners is good. In some embodiments of the present disclosure, the determining that the liner is a steel liner according to at least one of material toughness, material ductility, fatigue failure resistance, construction environment requirements, and construction cycle of the liner specifically includes: According to the method, the construction period of the glass fiber reinforced plastic lining is larger than that of the steel lining, and/or the construction cost of the glass fiber reinforced plastic lining is larger than that of the steel lining, and/or the toughness of the glass fiber reinforced plastic lining is smaller than that of the steel lining, and/or the ductility of the glass fiber reinforced plastic lining is smaller than that of the steel lining, and/or the steel lining is determined according to the fatigue failure resistance of the glass fiber reinforced plastic lining being smaller than that of the steel lining. In some embodiments of the present disclosure, the liner is determined to be a steel liner according to a construction period of the glass fiber reinforced plastic liner being 1.5-2.5 times a construction period of the steel liner, and according to a construction cost of the glass fiber reinforced plastic liner being 2.5-3.5 times a construction cost of the steel liner. In some embodiments of the present disclosure, the thickness of the solvent-free liquid epoxy coating of the steel lining disposed at the bottom of the cavity is greater than the thickness of the solvent-free liquid epoxy coating of the