Hot corner protection barrel of LNG (Liquefied Natural Gas) bimetal full-capacity tank

Abstract

The utility model provides a hot corner protection cylinder of an LNG (Liquefied Natural Gas) bimetal full-capacity tank, which comprises a plurality of sub-cylinders arranged along the height direction, and each sub-cylinder comprises a plurality of wallboards connected end to end; a whole circle of reinforcing rib structure is arranged on the inner wall of the sub-cylinder body and comprises an upper reinforcing rib and a lower reinforcing rib which are welded at a certain distance from the upper end and the lower end of the inner wall of each wall plate, and longitudinal reinforcing ribs welded on the left side and the right side of each wall plate; and all the upper reinforcing ribs and the lower reinforcing ribs of the same sub-cylinder body are welded end to end respectively to form an upper annular reinforcing rib and a lower annular reinforcing rib. According to the utility model, the upper annular reinforcing rib and the lower annular reinforcing rib are welded near the position of the annular welding seam of the hot corner protection barrel, the longitudinal reinforcing ribs are welded on the two sides of the longitudinal welding seam, and the two types of reinforcing ribs are connected to form a whole circle of annular frame reinforcing rib structure, so that the welding construction deformation of the wall plate of the subsequent hot corner protection barrel is controlled; the construction qualification rate and the construction efficiency are improved, and the low-temperature heat insulation performance of the storage tank is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-temperature storage tanks, and in particular relates to a thermal corner protection cylinder of an LNG bimetallic full-containment tank. Background Art

[0002] At present, the LNG bimetallic full-containment storage tank is equipped with a low-temperature resistant thermal corner protection structure on the inner lower part of the secondary container, which includes a thermal corner protection cylinder, a bottom plate, a sealing plate, etc. For details, please refer to the corner protection structure disclosed in CN202210367721.0. The thermal corner protection cylinder requires that the local concave-convex deformation of the wall panel after welding should not be greater than 3% of the deformation length, and should not be greater than 50mm. If the concave-convex deformation of the thermal corner protection cylinder exceeds this requirement, it will cause a large gap between it and the rear glass brick cold insulation material, affecting the low-temperature insulation performance of the storage tank.

[0003] The current practice of preventing deformation during construction of hot corner protection cylinders is as follows: first, the deformation in the welding of cylinder wall panels is controlled by selecting reasonable welding processes (such as small current, thin welding wire) and welding procedures; second, the deformation of the welded wall panels is checked to find out and mark the positions where the deformation exceeds the standard; finally, the welds at the positions where the deformation exceeds the standard are re-cut, and the excess gap between the cylinder wall panels and the glass bricks behind them is filled with cold insulation material glass wool to ensure the low-temperature insulation performance of the storage tank.

[0004] The prior art has the following technical problems: 1) Since the thickness of the thermal angle protection cylinder wall panel is thin and the size is long, the prior art solution cannot well control the concave and convex deformation of the thermal angle protection cylinder wall panel after welding. In order to meet the design and specification requirements, it is necessary to perform secondary rectification on the excessive parts of the welded cylinder wall panel or take remedial measures such as plugging cotton. Not only is the construction time-consuming and labor-intensive, but the effect is poor; 2) When the concave and convex deformation of the thermal angle protection cylinder wall panel exceeds the standard and appears far away from the weld of the thermal angle protection cylinder wall panel, it is often difficult or even impossible to rectify, which will affect the low-temperature insulation performance of the storage tank.

[0005] After searching, no similar technical solution to the present utility model has been disclosed. Utility Model Content

[0006] The utility model aims to solve the technical problems existing in the prior art and aims to provide a thermal corner protection cylinder of a LNG bimetallic full containment tank.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a thermal corner protection cylinder of an LNG bimetallic full containment tank, comprising a plurality of annular sub-cylinders arranged in sequence along the height direction, each sub-cylinder comprising a plurality of wall panels arranged in sequence in the circumferential direction and connected end to end; a full circle of reinforcing rib structure is provided on the inner wall of each sub-cylinder, the reinforcing rib structure comprising an upper reinforcing rib welded to the upper part of the inner wall of each wall panel at a certain distance from its upper surface, and a lower reinforcing rib welded to the lower part at a certain distance from its lower surface, all the upper reinforcing ribs of the same sub-cylinder are welded end to end to form an upper annular reinforcing rib, and all the lower reinforcing ribs of the same sub-cylinder are welded end to end to form a lower annular reinforcing rib; two adjacent wall panels of the same sub-cylinder are welded to form a longitudinal weld, and the upper end of the lower sub-cylinder is welded to the lower end of the upper sub-cylinder to form a circumferential weld.

[0008] The above technical scheme forms a full circle of reinforcement rib structure by installing upper and lower annular reinforcement ribs near the annular weld position of the thermal angle protection cylinder, so as to control the subsequent welding construction deformation of the wall panel of the thermal angle protection cylinder, improve the construction qualification rate, improve the construction efficiency, ensure that the installation construction deformation of the cylinder wall panel meets the design specification requirements, and ensure the low-temperature insulation performance of the storage tank.

[0009] In a preferred embodiment of the present invention, the reinforcing rib structure further includes longitudinal reinforcing ribs welded at a certain distance from the longitudinal weld on the left and right sides of the inner wall of each wall panel.

[0010] The above technical solution adds longitudinal reinforcing ribs on the left and right sides of the longitudinal weld position of the thermal angle protection cylinder to reduce the subsequent welding and installation deformation of the wall plate of the thermal angle protection cylinder.

[0011] In a preferred embodiment of the present invention, the longitudinal reinforcing ribs are welded on the inner wall of the wall panel at a position 250 mm away from the longitudinal weld position.

[0012] In a preferred embodiment of the present invention, the longitudinal reinforcing ribs are located between the upper reinforcing ribs and the lower reinforcing ribs, and the upper and lower ends of the longitudinal reinforcing ribs of each wall panel are welded to the upper reinforcing ribs and the lower reinforcing ribs respectively.

[0013] In the above technical solution, the longitudinal reinforcement ribs are welded together with the upper annular reinforcement ribs and the lower annular reinforcement ribs, and the formed reinforcement rib structure is a full-circle circular frame reinforcement structure, which further reduces the welding and installation deformation of the wall panels of the subsequent thermal angle protection cylinder.

[0014] In a preferred embodiment of the present invention, the upper reinforcing ribs and the lower reinforcing ribs are welded on the inner wall of the wall panel at a position 250 mm away from the circumferential weld position.

[0015] In another preferred embodiment of the present utility model, the wall panels of two adjacent sub-cylinder bodies are staggered, and the longitudinal welds of two adjacent sub-cylinder bodies are staggered.

[0016] Compared with the longitudinal weld alignment arrangement, the above technical solution adopts the longitudinal weld staggered arrangement, so that the installed thermal corner protection cylinder is more solid.

[0017] In another preferred embodiment of the present utility model, the wall panels of all the sub-cylinders are staggered, and the longitudinal welds of all the sub-cylinders are staggered.

[0018] Compared with the longitudinal weld alignment arrangement, the above technical solution adopts the longitudinal weld staggered arrangement, so that the installed thermal corner protection cylinder is more solid.

[0019] In another preferred embodiment of the utility model, the longitudinal weld and the circumferential weld are formed after the reinforcing rib structure is formed, and before the longitudinal weld and the circumferential weld are formed, the wall panel is tightly fitted to the glass brick behind it through a temporary diagonal brace.

[0020] The above technical solution first forms a full circle of reinforcing rib structure, and then welds each wall panel, and the reinforcing rib structure prevents welding deformation of the wall panel.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic structural diagram of a thermal corner protection cylinder of an LNG bimetallic full containment tank in an embodiment.

[0024] Figure 2 yes Figure 1 A partial enlarged view of point A in the figure.

[0025] Figure 3 It is a plan view of the unfolded thermal corner protection cylinder.

[0026] The reference numerals in the drawings of the specification include: a heat corner protection cylinder 10 , a sub-cylinder 11 , a wall panel 12 , a longitudinal weld 13 , a circumferential weld 14 , a reinforcing rib structure 20 , an upper reinforcing rib 21 , a lower reinforcing rib 22 , a longitudinal reinforcing rib 23 , and a glass brick 30 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] The utility model provides a thermal corner protection cylinder of a LNG bimetallic full containment tank, such as Figure 1-Figure 3 As shown, in a preferred embodiment, the thermal corner protection cylinder 10 includes a plurality of annular sub-cylinders 11 arranged in sequence along the height direction. For example, three identical sub-cylinders 11 are arranged, which are the first sub-cylinder, the second sub-cylinder and the third sub-cylinder from bottom to top. Each sub-cylinder 11 includes a plurality of wall panels 12 arranged in sequence in the circumferential direction and connected end to end, and the wall panels 12 are arc-shaped steel plates.

[0031] A full circle of reinforcing rib structures 20 are provided on the inner wall of each sub-cylinder 11, and the reinforcing rib structure 20 includes an upper reinforcing rib 21 welded at a certain distance from the upper surface of the upper portion of the inner wall of each wall plate 12, and a lower reinforcing rib 22 welded at a certain distance from the lower surface of the lower portion. Taking the hot corner protection cylinder of a 10,000 cubic meter LNG bimetallic storage tank as an example, the upper reinforcing rib 21 and the lower reinforcing rib 22 can be welded at a position 250mm away from the end face of the inner wall of the wall plate 12, and all the upper reinforcing ribs 21 of the same sub-cylinder 11 are welded end to end to form a full circle of upper annular reinforcing ribs, and all the lower reinforcing ribs 22 of the same sub-cylinder 11 are welded end to end to form a full circle of lower annular reinforcing ribs.

[0032] The two adjacent left and right wall panels 12 of the same sub-cylinder 11 are welded to form a longitudinal weld 13, and a plurality of wall panels 12 on the same circumference are welded end to end to form a sub-cylinder 11; the upper end of the lower sub-cylinder 11 is welded to the lower end of the upper sub-cylinder 11 to form a full-circle circumferential weld 14, and a plurality of sub-cylinders 11 are welded in sequence along the height direction to form a hot corner protection cylinder 10. Preferably, the wall panels 12 of two adjacent sub-cylinders 11 are staggered, and the longitudinal welds 13 of two adjacent sub-cylinders 11 are staggered; further preferably, the wall panels 12 of all sub-cylinders 11 are staggered, and the longitudinal welds 13 of all sub-cylinders 11 are staggered.

[0033] In another preferred embodiment, the reinforcing rib structure 20 further includes longitudinal reinforcing ribs 23 welded at a certain distance from the longitudinal weld 13 on the left and right sides of the inner wall of each wall panel 12, and two longitudinal reinforcing ribs 23 are welded on one wall panel 12, for example, the longitudinal reinforcing ribs 23 are welded at a position 250 mm away from the inner wall of the wall panel 12 from its side (the longitudinal weld 13). Preferably, the longitudinal reinforcing ribs 23 are located between the upper reinforcing ribs 21 and the lower reinforcing ribs 22, and the upper and lower ends of the longitudinal reinforcing ribs 23 of each wall panel 12 are respectively welded to the upper reinforcing ribs 21 and the lower reinforcing ribs 22, that is, the upper and lower ends of all the longitudinal reinforcing ribs 23 of the same sub-cylinder 11 are respectively welded to the upper annular reinforcing ribs and the lower annular reinforcing ribs to form a full circle of the reinforcing rib structure 20.

[0034] The construction process of the thermal corner protection cylinder 10 of the utility model is as follows:

[0035] 1) After all the wall panels 12 of the first sub-cylinder 11 at the bottom are assembled and their lower ends are fixed to the tank bottom, temporary diagonal braces are used to fix the wall panels 12 to prevent them from tipping over. On both sides of the length direction of the wall panels 12, 250 mm away from the longitudinal weld 13 and 256 mm away from the circumferential weld 14, longitudinal reinforcing ribs 23 (the longitudinal reinforcing ribs 23 are 60 mm wide and 6 mm thick, and the length of the longitudinal reinforcing ribs 23 is determined according to the width of the wall panels 12) are fixed to the wall panels 12 by an intermittent welding method of 200*10 mm and a welding angle height of 6 mm.

[0036] 2) After the two longitudinal reinforcing ribs 23 of the wall panel 12 are installed, multiple temporary diagonal braces are added in the length direction of the wall panel 12 to make the wall panel 12 fit tightly with the rear glass brick 30. After fitting, at the upper and lower ends of the wall panel 12, 250 mm away from the circumferential weld 14, the upper reinforcing rib 21 and the lower reinforcing rib 22 are fixed to the wall panel 12 by an intermittent welding method of 1000×10mm and a weld foot height of 6mm, and the upper and lower reinforcing ribs 21 and 22 are welded at the contact points with the longitudinal reinforcing rib 23, using full welding and a weld foot height of 6mm.

[0037] 3) Repeat the above steps 1) and 2) to weld the longitudinal reinforcing ribs 23 , the upper reinforcing ribs 21 and the lower reinforcing ribs 22 to the remaining wall panels 12 of the first sub-cylinder 11 .

[0038] 4) The upper reinforcing ribs 21 and the lower reinforcing ribs 22 at the same height of two adjacent wall panels 12 of the first sub-cylinder body 11 are butt-welded to form upper annular reinforcing ribs and lower annular reinforcing ribs, and finally the longitudinal reinforcing ribs 23, the upper annular reinforcing ribs and the lower annular reinforcing ribs on the first sub-cylinder body 11 are connected into a whole to form a reinforcing rib structure 20 of a complete circle of the circular ring frame.

[0039] 5) Using the same method as steps 1) to 4) above, complete the installation of the remaining two sub-cylinders 11 and the reinforcing rib structure 20, and the reinforcing rib structure 20 of each circular frame is formed on the inner wall of the three sub-cylinders 11.

[0040] 6) After the reinforcement rib structure 20 of all sub-cylinders 11 is installed, welding is performed between adjacent wall panels 12 at the same height to form a longitudinal weld 13, and welding is performed between each sub-cylinder 11 to form a circumferential weld 14. After the welding of all the welds of the sub-cylinders 11 is completed, the temporary diagonal braces on each wall panel 12 can be removed, and the reinforcement rib structure 20 on the sub-cylinder 11 is no longer removed. After the temporary diagonal braces are removed, the concave and convex deformation of the wall panel 12 of the thermal angle protection cylinder 10 is checked to see if it meets the design specification requirements.

[0041] It should be noted that when the longitudinal reinforcing ribs 23, the upper reinforcing ribs 21 and the lower reinforcing ribs 22 on the wall panel 12 are welded and fixed, it is strictly necessary to ensure that the reinforcing ribs are closely fitted to the wall panel 12 to avoid deformation of the wall panel 12 during welding and fixing. During construction, deformation of the wall panel 12 during welding and fixing is avoided, and at the same time, contraction seams of the wall panel 12 are set (one contraction seam is set for every three longitudinal seams), and then the longitudinal welds 13 are welded, and finally the contraction seams are welded.

[0042] In addition, when welding the upper reinforcing ribs 21 and the lower reinforcing ribs 22 of adjacent wall panels 12, if it is found that the gap between the wall panel 12 and the rear glass brick 30 is too large (such as 20 mm), temporary diagonal braces should be added in time to reduce the gap before welding the adjacent upper reinforcing ribs 21 and the lower reinforcing ribs 22.

[0043] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A thermal corner protection cylinder of a LNG bimetallic full containment tank, characterized in that: It comprises a plurality of annular sub-cylinder bodies arranged in sequence along the height direction, and each sub-cylinder body comprises a plurality of wall panels arranged in sequence in the circumferential direction and connected end to end; A full circle of reinforcing rib structure is provided on the inner wall of each sub-cylinder, the reinforcing rib structure comprising an upper reinforcing rib welded to the upper portion of the inner wall of each wall panel at a certain distance from its upper surface, and a lower reinforcing rib welded to the lower portion at a certain distance from its lower surface, all upper reinforcing ribs of the same sub-cylinder are welded end to end to form an upper annular reinforcing rib, and all lower reinforcing ribs of the same sub-cylinder are welded end to end to form a lower annular reinforcing rib; Two adjacent wall plates of the same sub-cylinder are welded to form a longitudinal weld, and the upper end of the lower sub-cylinder is welded to the lower end of the upper sub-cylinder to form a circumferential weld.

2. The thermal corner protection cylinder of a LNG bimetallic full containment tank according to claim 1, characterized in that: The reinforcing rib structure also includes longitudinal reinforcing ribs welded at a certain distance from the longitudinal weld on the left and right sides of the inner wall of each wall panel.

3. The thermal corner protection cylinder of a LNG bimetallic full containment tank according to claim 2 is characterized in that: The longitudinal reinforcing ribs are welded on the inner wall of the wall panel at a position 250 mm away from the longitudinal weld position.

4. The thermal corner protection cylinder of a bimetallic full containment tank for LNG according to claim 2, characterized in that: The longitudinal reinforcing ribs are located between the upper reinforcing ribs and the lower reinforcing ribs, and the upper and lower ends of the longitudinal reinforcing ribs of each wall panel are welded to the upper reinforcing ribs and the lower reinforcing ribs respectively.

5. A thermal corner protection cylinder of a LNG bimetallic full containment tank according to any one of claims 1 to 4, characterized in that: The upper reinforcing ribs and the lower reinforcing ribs are welded on the inner wall of the wall panel at a position 250 mm away from the circumferential weld position.

6. A thermal corner protection cylinder of a LNG bimetallic full containment tank according to any one of claims 1 to 4, characterized in that: The wall panels of two adjacent sub-cylinder bodies are staggered, and the longitudinal welds of two adjacent sub-cylinder bodies are staggered.

7. The thermal corner protection cylinder of a bimetallic full containment tank for LNG according to claim 6, characterized in that: The wall panels of all the sub-cylinders are staggered, and the longitudinal welds of all the sub-cylinders are staggered.

8. A thermal corner protection cylinder of a LNG bimetallic full containment tank according to any one of claims 1 to 4, characterized in that: The longitudinal weld and the circumferential weld are formed after the reinforcement structure is formed. Before the longitudinal weld and the circumferential weld are formed, the wall panel is tightly fitted with the glass bricks behind it through temporary diagonal braces.

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