Heat insulation structure of B-type liquefied natural gas cargo hold

Abstract

The invention discloses a heat insulation structure of a B-type liquefied natural gas cargo hold, and the heat insulation structure comprises an inner layer which comprises a plurality of first heat insulation plates which are independently installed outside a tank body through locking assemblies; the middle layer comprises a plurality of second heat insulation plate blocks, the second heat insulation plate blocks are bonded to the side, away from the tank body, of the inner layer, and a second abutted seam between every two adjacent second heat insulation plate blocks and a first abutted seam of the first heat insulation plate blocks are arranged in a staggered mode; the outer layer comprises a plurality of third heat insulation plates, the third heat insulation plates are bonded to the side, away from the inner layer, of the middle layer, and a third abutted seam is formed between every two adjacent third heat insulation plates; the heat insulation caulking pieces are embedded in the first abutted seam and the second abutted seam respectively; the heat insulation foam is poured into the third abutted seam and blocks the seam opening of the second abutted seam; and the waterproof sealing tape is sealed at a seam opening of the third abutted seam. The heat preservation structure solves the problem that a cold bridge is prone to occurring due to the fact that a penetrable joint is formed in an existing heat preservation structure of the B-type independent liquid cargo tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquefied natural gas ships, in particular to a heat insulation structure of a B-type liquefied natural gas cargo tank. BACKGROUND

[0002] Liquefied natural gas refers to a colorless and transparent cryogenic liquid obtained by cooling natural gas mainly composed of methane to about -163 DEG C and compressing it to 1 / 600 of its gas volume, and is an important clean energy. The liquefied natural gas ship is a main transport tool for the sea transportation of liquefied natural gas, and is a ship with high technology, high difficulty and high added value. The independent type liquid cargo containment system is a self-supporting liquid cargo containment system, wherein the B-type independent liquid cargo tank has the advantages of large space, small LNG daily evaporation, convenient installation and maintenance, etc., and has been used for transporting liquefied natural gas for a long time. The temperature difference between the liquid cargo and the external environment of the ship for transporting liquefied natural gas is as high as nearly 200 DEG C during navigation. The traditional heat preservation structure of the B-type independent liquid cargo tank forms a penetrating joint, which is easy to have a cold bridge, and a large amount of heat will flow into the tank through the joint of the heat preservation structure, causing the evaporation of the liquid cargo. On the one hand, it causes the loss of goods, and on the other hand, a large amount of liquid cargo evaporation will cause the pressure in the liquid cargo tank to rise, endangering the safety of the ship navigation. SUMMARY

[0003] In order to overcome the defects of the prior art, the present application provides a heat insulation structure of a B-type liquefied natural gas cargo tank to solve the problem that the heat preservation structure of the existing B-type independent liquid cargo tank forms a penetrating joint and is easy to have a cold bridge.

[0004] In order to achieve the above-mentioned purpose, a heat insulation structure of a B-type liquefied natural gas cargo tank is provided, which comprises: an inner layer comprising a plurality of first heat insulation plate blocks, the first heat insulation plate blocks being independently installed on the outside of the tank body through a locking assembly, and a first joint being formed between two adjacent first heat insulation plate blocks; an intermediate layer comprising a plurality of second heat insulation plate blocks, the second heat insulation plate blocks being bonded to the side of the inner layer away from the tank body, a second joint being formed between two adjacent second heat insulation plate blocks, and the second joint being disposed in a staggered manner with the first joint; an outer layer comprising a plurality of third heat insulation plate blocks, the third heat insulation plate blocks being bonded to the side of the intermediate layer away from the inner layer, a third joint being formed between two adjacent third heat insulation plate blocks, and the position of the third joint corresponding to the position of the second joint; a heat insulation caulking piece, the first joint and the second joint each being embedded with the heat insulation caulking piece; a heat insulation foam, the heat insulation foam being filled in the third joint and being sealed in the joint opening of the second joint; a waterproof sealing tape, the waterproof sealing tape being bonded to the side of the outer layer away from the intermediate layer and being sealed in the joint opening of the third joint.

[0005] Further, the locking assembly comprises.

[0006] A wall-attached rod connected to the outer wall of the tank body; A heat insulation pressing plate adjustably installed on the wall-attached rod, the heat insulation pressing plate being pressed against the first heat insulation plate.

[0007] Further, a gasket is arranged between the first heat insulation plate and the outer wall of the tank body, the gasket being formed with a through hole, the wall-attached rod being arranged in the through hole, and a gap being formed between the wall-attached rod and the hole wall of the through hole.

[0008] Further, an outer thread is formed on the end of the wall-attached rod away from the tank body, a screwing piece being screwed on the end of the wall-attached rod, the screwing piece being pressed against the side of the heat insulation pressing plate away from the tank body.

[0009] Further, the heat insulation caulking piece is glass wool, aerogel or melamine foam.

[0010] Further, the heat insulation foam is polyurethane foam or polystyrene foam.

[0011] Further, the second joint comprises two straight joint sections and a diagonal joint section arranged in a staggered manner, the two straight joint sections being arranged on opposite sides of the intermediate layer respectively, the two ends of the diagonal joint section being connected to the two straight joint sections respectively, and the third joint being aligned with the straight joint section on the side of the intermediate layer away from the inner layer.

[0012] Further, the third joint has a first side close to the intermediate layer and a second side away from the intermediate layer, and the width of the third joint gradually decreases from the first side to the second side.

[0013] Further, the side of the outer layer close to the intermediate layer is provided with a reinforcing anti-cracking net arranged along the length direction of the third joint, the two sides of the reinforcing anti-cracking net being overlapped on the adjacent two third heat insulation plates, and the reinforcing anti-cracking net being covered on the joint opening of the third joint.

[0014] The B-type liquefied natural gas cargo tank of the present application has the following advantages: three layers of heat insulation plates, i.e., the inner layer, the intermediate layer and the outer layer, are arranged on the outer wall of the tank body, the first joint of the inner layer and the second joint of the intermediate layer are arranged in a staggered manner to avoid the formation of a through joint and the occurrence of a cold bridge, and the heat insulation performance of the heat insulation structure is improved. On the other hand, each first heat insulation plate of the inner layer is independently installed on the outer wall of the tank body through the locking assembly, the on-site construction and installation difficulty of the heat insulation structure is reduced, the precision requirements for the tank body, the calibration position of the locking assembly and the installation precision of the heat insulation plate are low, and the construction efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the drawings: Figure 1 A structural schematic diagram of a B-type liquefied natural gas cargo tank according to an embodiment of the present application.

[0016] Figure 2 A structural schematic diagram of an insulation structure of a B-type liquefied natural gas cargo tank according to an embodiment of the present application.

[0017] Figure 3 A sectional view of an insulation structure of a B-type liquefied natural gas cargo tank according to an embodiment of the present application.

[0018] Figure 4 A structural schematic diagram of a third joint according to an embodiment of the present application. Figure 3

[0019] Figure 5 A structural schematic diagram of a third joint according to an embodiment of the present application.

[0020] Figure 6 A structural schematic diagram of a third joint according to an embodiment of the present application. Figure 3

[0021] Figure 7 A structural schematic diagram of a third joint according to an embodiment of the present application. Figure 3

[0022] A structural schematic diagram of a third joint according to an embodiment of the present application. Figure 8

[0023] A structural schematic diagram of a third joint according to an embodiment of the present application. Figure 9 Figure 8 A structural schematic diagram of a third joint according to an embodiment of the present application.

[0024] Figure 10 A structural schematic diagram of a third joint according to an embodiment of the present application.

[0025] Figure 11 A structural schematic diagram of a third joint according to an embodiment of the present application.

[0026] Figure 12 A structural schematic diagram of a third joint according to an embodiment of the present application.

[0027] Figure 13 A structural schematic diagram of a third joint according to an embodiment of the present application.

[0028] Figure 14 A structural schematic diagram of a third joint according to an embodiment of the present application.​​​

[0029] Reference signs: Inner layer 1, first joint 10, first insulating plate 11, first glass fiber mesh 12, transition plate 13; Middle layer 2, second joint 20, straight joint section a, oblique joint section b, second insulating plate 21, second glass fiber mesh 22; Outer layer 3, third joint 30, third insulating plate 31, reinforced anti-cracking mesh 32, aluminum sheet 33; Insulating caulking 4; Insulating foam 5; Waterproof sealing tape 6; Locking assembly 7, wall-attached rod 71, heat-insulating pressing plate 72, gasket 73, screwing member 74, plunger 75; Tank body 8; Prefabricated insulation board 9. DETAILED DESCRIPTION

[0030] The application will be further described below in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.

[0032] Reference Figures 1 to 5 As shown in the drawings, the present application provides a heat-insulating structure of a B-type liquefied natural gas cargo tank, which comprises an inner layer 1, a middle layer 2, an outer layer 3, an insulating caulking 4, an insulating foam 5, and a waterproof sealing tape 6.

[0033] In the present embodiment, the heat-insulating structure of the B-type liquefied natural gas cargo tank of the present application is installed on the outside or outer wall of the tank body. The tank body is used to contain liquefied natural gas. The inner layer 1, the middle layer 2, and the outer layer 3 of the heat-insulating structure of the B-type liquefied natural gas cargo tank of the present application are sequentially installed on the outside of the tank body. The inner layer is installed on the outside of the tank body. The middle layer is installed on the outside of the inner layer. The outer layer is installed on the outside of the middle layer.

[0034] Specifically, the inner layer 1 comprises a plurality of first insulating plates 11. The first insulating plates 11 are independently installed on the outside of the tank body 8 through the locking assembly 7. The first joint 10 is formed between two adjacent first insulating plates 11.

[0035] A plurality of first insulating plate pieces 11 are arranged on the outside of the tank body, so that the inner layer is wrapped around the tank body. Each first insulating plate piece is independently arranged by a locking assembly. The inner layer of the B-type LNG cargo tank of the present application has low installation difficulty at the construction site, low precision requirements for the tank body, the locking assembly, and the installation of the first insulating plate pieces, and high construction efficiency.

[0036] The intermediate layer 2 comprises a plurality of second insulating plate pieces 21. The second insulating plate pieces 21 are bonded to the side of the inner layer 1 away from the tank body 8. A second joint 20 is formed between two adjacent second insulating plate pieces 21. The second joint 20 is arranged in a staggered manner with the first joint 10.

[0037] In this embodiment, the second insulating plate pieces of the intermediate layer are bonded to the outer side of the first insulating plate of the inner layer by adhesive.

[0038] The outer layer 3 comprises a plurality of third insulating plate pieces 31. The third insulating plate pieces 31 are bonded to the side of the intermediate layer 2 away from the inner layer 1. A third joint 30 is formed between two adjacent third insulating plate pieces 31. The position of the third joint 30 corresponds to the position of the second joint 20.

[0039] In this embodiment, the third insulating plate pieces of the outer layer are bonded to the outer side of the second insulating plate of the intermediate layer by adhesive.

[0040] Referring to FIGS. 1, 2, 3, and 4, the first joint 10 and the second joint 20 are respectively embedded with an insulating joint piece 4. Figure 3 Figure 4 As a preferred embodiment, the insulating joint piece 4 is a soft foam material such as glass wool, aerogel, or melamine foam.

[0041] As a preferred embodiment, the insulating joint piece 4 is a soft foam material such as glass wool, aerogel, or melamine foam.

[0042] The third joint 30 is filled with insulating foam 5. The insulating foam 5 seals the joint of the second joint 20.

[0043] As a preferred embodiment, the insulating foam 5 is polyurethane foam or polystyrene foam. After the third insulating plate is installed, the insulating foam is sprayed into the third joint to form a sealing structure with a shape and size that fit the inner cavity of the third joint.

[0044] A waterproof sealing tape 6 is bonded to the side of the outer layer 3 away from the intermediate layer 2. The waterproof sealing tape 6 seals the joint of the third joint 30.

[0045] After the insulating foam is cured and formed, the waterproof sealing tape 6 is pasted to the side of the outer layer 3 away from the intermediate layer 2. The opposite sides of the waterproof sealing tape 6 are respectively overlapped on the adjacent two third insulating plates.

[0046] ​As a preferred embodiment, the waterproof sealing tape 6 is a butyl aluminum foil tape.

[0047] The locking assembly 7 comprises a wall-attached rod 71 and a thermal insulation pressing plate 72.

[0048] The wall-attached rod 71 is connected to the outer wall of the tank body 8. The thermal insulation pressing plate 72 is adjustably mounted on the wall-attached rod 71. The thermal insulation pressing plate 72 is pressed against the first thermal insulation plate 11.

[0049] In the embodiment, one end of the wall-attached rod is welded to the outer wall of the tank body. The wall-attached rod is perpendicular to the outer wall of the tank body. Referring to Figure 3 illustrated, the side portion and the middle portion of the first thermal insulation plate are mounted on the outer wall of the tank body by the locking assemblies, respectively.

[0050] As a preferred embodiment, a gasket 73 is provided between the first thermal insulation plate 11 and the outer wall of the tank body 8. The gasket 73 is formed with a through hole. The wall-attached rod 71 is inserted into the through hole. A gap is formed between the wall-attached rod 71 and the hole wall of the through hole.

[0051] In the embodiment, the wall-attached rod is a threaded rod. Specifically, an outer thread is formed on the end of the wall-attached rod 71 away from the tank body 8. A screwing member 74 is screwed on the end of the wall-attached rod 71. The screwing member 74 is pressed against the side of the thermal insulation pressing plate 72 away from the tank body 8.

[0052] Referring to Figure 4 illustrated, Figure 4 illustrated, the locking assembly of the side portion of the first thermal insulation plate is a structure diagram. The side portion of the first thermal insulation plate is formed with a slot. The side of the thermal insulation pressing plate is inserted into the slot. The screwing member is pressed against the side of the thermal insulation pressing plate away from the tank body. In the embodiment, the thermal insulation pressing plate is a bakelite plate. A PTFE gasket is provided between the screwing member and the thermal insulation pressing plate. A stainless steel gasket is provided on the side of the PTFE gasket away from the thermal insulation pressing plate.

[0053] As a preferred embodiment, referring to Figure 9 and Figure 10 illustrated, the wall-attached rod comprises a segmented threaded rod and a lengthening sleeve. The segmented threaded rod comprises two rod segments. The two rod segments are coaxially arranged. One end of one rod segment is welded to the outer wall of the tank body. The two rod segments are formed with outer threads. The lengthening sleeve is formed with an inner thread. The other ends of the two rod segments are screwed into the two ends of the lengthening sleeve.

[0054] For the locking assembly of the middle portion of the first thermal insulation plate, the middle portion of the first thermal insulation plate is formed with a through hole. The locking member is arranged in the through hole. The hole opening of the end of the through hole close to the tank body is formed with a flange. The thermal insulation pressing plate is pressed against the flange. The through hole is filled with a caulking member.

[0055] Referring to Figure 4As shown, the second joint 20 comprises two straight joint sections a and a slant joint section b. The two straight joint sections a are arranged in staggered manner. The two straight joint sections a are arranged on opposite sides of the middle layer 2 respectively. The two ends of the slant joint section b are connected to the two straight joint sections a respectively. The third joint 30 is aligned to the straight joint section a of the middle layer 2 which is away from the inner layer 1.

[0056] In the present embodiment, the width of the second joint is smaller than the width of the third joint. In combination with the special design of the third joint, the polyurethane foam is filled in the third joint completely. Figure 4 and Figure 5 As shown, the third joint 30 has a first side close to the middle layer 2 and a second side away from the middle layer 2. The width of the third joint 30 gradually decreases from the first side to the second side. The width of the second joint is smaller than the width of the first side of the third joint. Preferably, the cross section of the third joint is isosceles trapezoidal.

[0057] Continuing to refer to Figure 5 As shown, the side of the outer layer 3 close to the middle layer 2 is paved with a reinforcing anti-cracking net. The reinforcing anti-cracking net is arranged along the length direction of the third joint 30. The two sides of the reinforcing anti-cracking net are overlapped on the two adjacent third insulation plate blocks 31. The reinforcing anti-cracking net covers the joint of the third joint 30.

[0058] As a preferred embodiment, the reinforcing anti-cracking net is steel wire net. The reinforcing anti-cracking net has the function of reinforcing the sprayed polyurethane foam. The reinforcing anti-cracking net is installed on the third insulation plate block by rivet.

[0059] After the polyurethane foam is sprayed in the third joint, the sprayed polyurethane foam is initiated, and at the same time, the special shape of the third joint forms pressure inside, which plays the role of a “mold”. The polyurethane foam fills the third joint between the third insulation plate blocks completely. The butyl aluminum foil tape protects the outer surface of the polyurethane foam.

[0060] Referring to Figure 3 and Figure 6 As shown, the middle part of the part of the first insulation plate block is independently installed on the outside of the tank body by the locking assembly. Specifically, the middle part of the part of the first insulation plate block, the second insulation plate block and the third insulation plate block is provided with a through hole. The size of the through hole on the first insulation plate block and the second insulation plate block is matched, and the size of the through hole on the third insulation plate block is larger than that of the through hole on the first insulation plate block. The locking assembly is arranged in the through hole of the first insulation plate block to fix the first insulation plate block on the outside of the tank body. After the locking assembly is installed, glass wool is filled in the through hole of the first insulation plate block. The plunger 75 is embedded in the through hole of the second insulation plate block, so that the end of the plunger 75 is inserted into the hole of the through hole of the first insulation plate block to reinforce the connection strength of the first insulation plate block and the second insulation plate block, and at the same time, to avoid the staggered arrangement of the first insulation plate block and the second insulation plate block. The polyurethane foam in the through hole of the third insulation plate block seals the insulation.

[0061] In this embodiment, combined with Figures 8 to 10 As shown, the upper opening of the perforation in the second insulation plate is sealed with reinforced crack-resistant mesh 32. The upper opening of the perforation in the third insulation plate is sealed with waterproof sealing tape 6.

[0062] See Figure 3 and Figure 7 As shown, to achieve the staggered arrangement of the second seam 20 and the first seam 10, a transition plate is provided between two adjacent first insulation panels. The first seam and the second seam between the transition plate and the two adjacent first insulation panels are staggered. Glass wool is embedded in the first seam between the transition plate and the adjacent first insulation panels.

[0063] During construction, the insulation structure of the Type B liquefied natural gas cargo tank of the present invention is constructed in the following order: inner layer, middle layer, and outer layer. Before constructing the inner layer, the surface of the tank is cleaned, marking lines are made, and the wall-mounted rods of the locking components are welded. Subsequently, the inner, middle, and outer layers are installed, and insulation caulking fittings are installed, insulation foam is sprayed, and waterproof sealing tape is pasted.

[0064] See Figure 6 As shown, Figure 6 This is an exploded structural diagram of the inner, middle, and outer layers of a Type B liquefied natural gas cargo tank according to an embodiment of the present invention. Specifically, the first insulating plate 11 of the inner layer has a first fiberglass mesh 12 bonded to the side facing the tank body; the second insulating plate 21 of the middle layer has a second fiberglass mesh 22 bonded to the side facing the inner layer; the third insulating plate 31 of the outer layer has a reinforcing crack-resistant mesh 32 bonded to the side facing the middle layer, the reinforcing crack-resistant mesh 32 being fully laid between the middle and outer layers, and an aluminum plate 33 bonded to the other side of the third insulating plate 31 of the outer layer facing away from the middle layer.

[0065] See Figure 1 As shown, the outer surface of the entire tank includes a planar area (such as...). Figure 11 As shown), dihedral regions (such as...) Figure 12 (as shown) and trihedral regions (such as) Figure 13 and Figure 14 (As shown), support area, tank top area, gas dome area, sump collection well area, and lifting lug area.

[0066] in, Figure 11 This is a schematic diagram of the structure of the thermal insulation node in the planar region of the tank body according to an embodiment of the present invention. Figure 12 This is a schematic diagram of the structure of the thermal insulation node of the dihedral region of the tank body according to an embodiment of the present invention. Figure 13 This is a schematic diagram of the structure of the thermal insulation node of the three-sided region of the tank body according to an embodiment of the present invention. Figure 14The sectional view is for the heat insulation node of the trihedral region of the tank body of the embodiment of the present application, in particular, the installation sequence of the heat insulation structures of the planar region, the dihedral region and the trihedral region of the tank body is the same.

[0067] The above description is merely preferred embodiments of the present application and a description of the technical principles of the application. It should be understood by those skilled in the art that the scope of the application disclosed in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An insulation structure for a type B liquefied natural gas cargo tank, characterized in that, include: The inner layer includes multiple first insulation panels, which are independently installed on the outside of the tank body by locking components, and a first joint is formed between two adjacent first insulation panels. The intermediate layer includes multiple second insulation panels. The second insulation panels are bonded to the side of the inner layer away from the tank body. A second seam is formed between two adjacent second insulation panels. The second seam is offset from the first seam. The outer layer includes multiple third insulation panels, which are bonded to the side of the middle layer away from the inner layer. A third seam is formed between two adjacent third insulation panels, and the position of the third seam corresponds to the position of the second seam. The thermal insulation caulking piece is respectively embedded in the first joint and the second joint; Insulating foam is injected into the third joint and sealed at the opening of the second joint; A waterproof sealing tape is adhered to the outer layer on the side away from the middle layer and seals the seam of the third seam.

2. The thermal insulation structure of the Type B liquefied natural gas cargo tank according to claim 1, characterized in that, The locking component includes: A wall-mounted rod is attached to the outer wall of the tank. A heat-insulating pressure plate is installed in an adjustable position on the wall-mounted rod, and the heat-insulating pressure plate presses against the first heat-insulating plate.

3. The insulation structure of the Type B liquefied natural gas cargo tank according to claim 2, characterized in that, A pad is provided between the first insulation plate and the outer wall of the tank. The pad has a perforation, and the wall-mounting rod passes through the perforation. A gap is formed between the wall-mounting rod and the wall of the perforation.

4. The thermal insulation structure of the Type B liquefied natural gas cargo tank according to claim 3, characterized in that, The end of the wall-mounted rod away from the tank body has an external thread, and a threaded engagement member is screwed onto one end of the wall-mounted rod. The threaded engagement member presses against the side of the heat-insulating plate away from the tank body.

5. The insulation structure of the Type B liquefied natural gas cargo tank according to claim 1, characterized in that, The thermal insulation sealant is made of glass wool, aerogel, or melamine foam.

6. The insulation structure of the Type B liquefied natural gas cargo tank according to claim 1, characterized in that, The insulation foam is either polyurethane foam or polystyrene foam.

7. The insulation structure of the Type B liquefied natural gas cargo tank according to claim 1, characterized in that, The second seam includes two straight seam segments and a diagonal seam segment that are staggered. The two straight seam segments are respectively located on opposite sides of the intermediate layer. The two ends of the diagonal seam segment are respectively connected to the two straight seam segments. The third seam is aligned with the straight seam segment on the side of the intermediate layer away from the inner layer.

8. The insulation structure of the Type B liquefied natural gas cargo tank according to claim 7, characterized in that, The third seam has a first side close to the intermediate layer and a second side away from the intermediate layer, and the width of the third seam gradually decreases from the first side to the second side.

9. The thermal insulation structure of the Type B liquefied natural gas cargo tank according to claim 1, characterized in that, The outer layer is provided with a reinforced crack-resistant mesh on one side near the middle layer, which is arranged along the length of the third joint. The two sides of the reinforced crack-resistant mesh overlap the two adjacent third insulation plates, and the reinforced crack-resistant mesh covers the joint of the third joint.

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