Prestressed gas storage container

Abstract

The utility model belongs to the technical field of civil engineering and energy engineering, and particularly relates to a prestressed gas storage container which comprises a steel lining, a buffer layer, a concrete layer and prestressed tendons, the steel lining is a closed inner cavity, the buffer layer is wrapped outside the steel lining, and the concrete layer is wrapped outside the buffer layer. The steel lining, the buffer layer and the concrete layer are of capsule-shaped structures; prestressed tendons are embedded in the concrete layer. The container has a good stress form and can bear higher gas storage pressure; compared with a gas storage container formed by a pure steel lining or steel lining coated with reinforced concrete, the gas storage container can greatly reduce the use amount of the steel lining or the reinforced concrete, and can bear higher internal pressure at the same time.

Description

Technical Field

[0001] This utility model patent belongs to the technical field of civil engineering and energy engineering, and specifically relates to a prestressed gas storage container. Background Art

[0002] In recent years, China has been vigorously developing a new power system with a growing proportion of renewable energy. Compressed air energy storage technology has rapidly gained popularity due to its advantages of large storage capacity, long discharge time, long service life, high safety, and wide-ranging utilization of heat, cooling, and electricity. Currently, containers used to store high-pressure air are mostly above-ground steel tanks or underground caverns. The former requires high steel lining thickness, resulting in high costs, while the latter relies on salt caverns or has strict geological conditions, which limits construction locations.

[0003] Therefore, it is necessary to design a gas storage container that is economical and can be built at any location. Utility Model Content

[0004] In order to solve the problems raised in the background technology, the utility model provides a prestressed gas storage container, which has the advantages of good economy, convenient layout and high safety.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A prestressed gas storage container comprises a steel lining, a buffer layer, a concrete layer and prestressed tendons, wherein: the steel lining is a closed inner cavity, the buffer layer is wrapped around the steel lining, and the buffer layer is wrapped around the concrete layer; the steel lining, buffer layer and concrete layer have a capsule-like structure; and prestressed tendons are embedded in the concrete layer.

[0007] Specifically, the thickness of the steel lining is 20 mm to 30 mm.

[0008] Specifically, the buffer layer is made of polyurethane rubber and has a thickness of 10 mm to 30 mm.

[0009] Specifically, the thickness of the concrete layer is 2m~4m.

[0010] Specifically, the prestressed tendons are composed of at least two steel strands, which are named the first prestressed tendon, the second prestressed tendon and the third prestressed tendon due to their different locations. The first prestressed tendon is arranged in the middle of the concrete layer, and several first prestressed tendons are arranged equidistantly along the circumferential direction; the second prestressed tendon is arranged radially at the end of the concrete layer; the third prestressed tendon is arranged axially and passes through the capsule-shaped structure, and anchor ribs are provided at both ends of the third prestressed tendon.

[0011] Furthermore, the first prestressed tendons of the same height are divided into 3-5 sections, and the multiple sections are enclosed to form a ring. Anchor ribs are provided at the junction of the ends of the two sections of the first prestressed tendons, and two first prestressed tendons are provided in each section.

[0012] As an implementation mode of the present utility model, when each ring of the first prestressed tendons of the same height is divided into 3 sections, the wrap angle of each section is 120°; the end joints of the first prestressed tendons of two adjacent layers are staggered, and the wrap angle between the end joints of the upper layer and the end joints of the lower layer is 60°.

[0013] As another embodiment of the present invention, when each ring of the first prestressed tendons of the same height is divided into 5 sections, the wrap angle of each section is 72°; the end joints of the first prestressed tendons of two adjacent layers are staggered, and the wrap angle between the end joints of the upper layer and the end joints of the lower layer is 36°.

[0014] Furthermore, the second prestressed tendons are arranged at equal central angles, and anchor ribs are provided at both ends of the second prestressed tendons.

[0015] Furthermore, at least three third prestressed tendons are provided, and the third prestressed tendons are arranged at equal intervals.

[0016] Beneficial effects of the utility model:

[0017] The prestressed gas storage container composed of steel lining, prestressed tendons, buffer layer and concrete designed in this utility model has a good stress form and can withstand higher gas storage pressure; compared with gas storage containers composed of pure steel lining or steel lining wrapped with reinforced concrete, the amount of steel lining or reinforced concrete used can be greatly reduced, and at the same time it can withstand higher internal pressure, and is a gas storage container with more reasonable stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional view of the utility model.

[0019] Figure 2 This is a cross-sectional view of the utility model.

[0020] Figure 3 It is a top view of the utility model.

[0021] Figure 4 This is a schematic diagram of the arrangement of the first prestressed tendons in two adjacent rings of the utility model.

[0022] In the figure, 1 is steel lining, 2 is buffer layer, 3 is concrete layer, 4 is first prestressed tendon, 5 is second prestressed tendon, and 6 is third prestressed tendon. DETAILED DESCRIPTION

[0023] Example 1: A prestressed gas storage vessel comprises a steel liner, a buffer layer, a concrete layer, and prestressed tendons. The steel liner forms a closed inner cavity, surrounded by a buffer layer, which in turn is surrounded by a concrete layer. The steel liner, buffer layer, and concrete layer form a capsule-like structure, and prestressed tendons are embedded within the concrete layer. The completed prestressed gas storage vessel has a capacity of 1000 m³. The steel liner is a cylindrical shell with an inner diameter of 6.4 m and a length of 33.2 m, 30 mm thick, and made of Q345. The buffer layer is made of 20 mm thick polyurethane. The concrete layer is 2 m thick and made of C50. The steel liner can withstand internal pressures of 10 MPa / 7 MPa. The prestressed tendons consist of multiple bundles of 7As15.2 steel strands, designated as primary, secondary, and tertiary tendons according to their location. The primary tendons are located in the middle of the concrete layer, with several equidistantly spaced circumferentially, and a 1m spacing between adjacent layers. Secondary tendons are radially positioned at the ends of the concrete layer, with equal central angles and anchor ribs at each end. Third tendons are axially positioned throughout the capsule-shaped structure, with anchor ribs at each end. Each ring of primary tendons at the same height is divided into five segments, forming a ring. Anchor ribs are installed at the junction of the two segments, with each segment forming a 72° wrap angle. The junctions between the ends of the primary tendons in adjacent layers are staggered, with a 36° wrap angle between the junctions of the upper and lower layers. The prestressed gas storage vessel disclosed in this utility model is used to store high-pressure gas. Due to the high internal pressure, prestressed tendons must be distributed throughout the entire structure. Theoretically, the more segments the first prestressed tendons have, the more uniform the stress distribution. The ideal generalized model is a single, unsegmented, annular prestressed tendon. Considering the construction difficulty, a five-segment layout of the first prestressed tendons is recommended.

[0024] The general finite element software ABAQUS is used to calculate the stress of prestressed gas storage container.

[0025] Concrete layer, steel lining, and cushion unit types: eight-node linear hexahedral unit C3D8; prestressed tendon unit type: three-node quadratic three-dimensional truss unit T3D3; constitutive model: an isotropic linear elastic constitutive model is adopted; coordinate system: the X-axis is horizontal, the Y-axis is vertical, and the Z-axis is horizontal. The coordinate system conforms to the right-hand screw rule.

[0026] In the model, it is assumed that each component is made of elastic material, and the material parameter values ​​are shown in the following table.

[0027]

[0028] Calculate the strength of the prestressed gas storage tank when the internal pressure of the prestressed gas storage tank is 10Mpa.

[0029] The steel lining deforms outwardly under internal pressure, and the whole is subjected to tensile stress, the maximum tensile stress being 156.3 MPa, the safety factor being 2.21, >1.35, the strength of the steel lining meeting the requirements; the tensile stress of the concrete layer is all less than the design value of the tensile strength of C50 concrete (1.89 MPa), the maximum tensile stress being 0.93 MPa, the safety factor being 2.03, >1.35, the strength of the concrete layer meeting the requirements; the maximum stress of the whole cushion layer is 1.7 MPa, less than the design value of the tensile strength (35 MPa), the safety factor being 20.59, >1.35, the strength of the cushion layer meeting the requirements; the maximum tensile stress of the prestressed tendon is 1221 MPa, less than the strength value of the steel strand (1860 MPa), the safety factor being 1.52, >1.35, the strength of the prestressed tendon meeting the requirements.

[0030] The engineering quantity and cost are as follows:

[0031]

[0032] The cost of each 1 cubic meter of the prestressed gas storage tank is about 5980 yuan (not including the steel lining), plus the steel lining, which is estimated to be about 10,000 yuan, while the cost of each 1 cubic meter of the steel gas storage tank currently used is as high as 20,000 yuan, which greatly saves the cost.

Claims

1. A prestressed gas storage container, characterized in that It includes a steel lining, a buffer layer, a concrete layer and prestressed tendons, wherein: the steel lining is a closed inner cavity, the buffer layer is wrapped outside the steel lining, and the buffer layer is wrapped outside the concrete layer; the steel lining, buffer layer and concrete layer have a capsule-like structure; prestressed tendons are embedded in the concrete layer.

2. A prestressed gas storage container as claimed in claim 1, characterized in that The prestressed tendons are composed of at least two steel strands, which are named the first prestressed tendon, the second prestressed tendon and the third prestressed tendon due to their different locations. The first prestressed tendon is arranged in the middle of the concrete layer, and several first prestressed tendons are arranged equidistantly along the circumferential direction; the second prestressed tendons are arranged radially at the end of the concrete layer; the third prestressed tendons are arranged axially and pass through the capsule-shaped structure, and anchor ribs are provided at both ends of the third prestressed tendons.

3. A prestressed gas storage container as claimed in claim 2, characterized in that The first prestressed tendons at the same height are divided into 3-5 sections, and multiple sections are enclosed to form a ring. Anchor ribs are set at the junction of the ends of the two sections of the first prestressed tendons, and two first prestressed tendons are set in each section.

4. A prestressed gas storage container as claimed in claim 3, characterized in that When each ring of the first prestressed tendons at the same height is divided into three sections, the wrap angle of each section is 120°; the end joints of the first prestressed tendons of two adjacent layers are staggered, and the wrap angle between the end joints of the upper layer and the end joints of the lower layer is 60°.

5. A prestressed gas storage container as claimed in claim 3, characterized in that When the first prestressed tendons at the same height are divided into 5 sections per circle, the wrap angle of each section is 72°; the end joints of the first prestressed tendons of two adjacent layers are staggered, and the wrap angle between the end joints of the upper layer and the end joints of the lower layer is 36°.

6. A prestressed gas storage container as claimed in claim 2, characterized in that The second prestressed tendons are arranged at equal central angles, and anchor ribs are provided at both ends of the second prestressed tendons.

7. A prestressed gas storage container as claimed in claim 1, characterized in that At least three third prestressed tendons are provided, and the third prestressed tendons are arranged at equal intervals.

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