A kind of liquid collecting pan device for receiving B type cabin LNG leakage and installation method

Abstract

The application discloses a collecting pan device for receiving B-type cabin LNG leakage and a mounting method thereof, and the collecting pan device comprises a collecting pan body arranged below a B-type cabin structure and a collecting pan support seat fixed on a ship inner bottom structure, the collecting pan body is a cuboid structure with an open upper end, a collecting pipe on the B-type cabin structure is located in a space of the collecting pan body, the collecting pan body comprises a rectangular bottom plate and a surrounding plate vertically arranged around the bottom plate, a lower surface of the bottom plate is provided with a groove, a lower end of the groove is flush with the lower surface of the bottom plate, the groove can slide on a top end of the collecting pan support seat, when the collecting pan support seat supports the collecting pan body, the top end of the collecting pan support seat is inserted into the groove, and the collecting pan support seat is fixedly connected with the bottom plate. The average distance between the bottom plate of the collecting pan body and the ship inner bottom structure is determined, the volume of the collecting pan body is increased in the limited space, the heat exchange area of the collecting pan is increased, and the maintenance and replacement of the collecting pan are facilitated.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a liquid collection tray device and installation method for receiving LNG leaks in Type B tanks. Background Technology

[0002] During LNG carrier operations, the Type B independent cargo tanks are subject to significant sloshing and loads due to the combined effects of complex maritime weather, wave loads, and ship motion. Over time, this can cause varying degrees of fatigue damage and structural failure to the tank structure. Unlike other types of cargo tanks, Type B tanks are not part of the ship's structural framework. They are placed within the cargo hold area via bottom support blocks. The weight of the cargo tank itself and the cargo it carries are transferred to the main hull structure through the support structure. Therefore, a certain distance exists between the Type B tank and the hull structure. Under severe sea conditions and high wave loads, stress concentration can easily occur at the connection and support areas between the Type B tank and the hull. In extreme cases, this can damage the Type B tank, leading to cryogenic LNG leakage. The leaked cryogenic LNG is extremely cold and can cause severe cold damage to the hull structure, which lacks cryogenic resistance, directly threatening the ship's navigational safety.

[0003] Therefore, Type B compartments are usually equipped with partial secondary shielding structures. Their function is to protect the surrounding hull structure from low-temperature liquid corrosion and reduce the risk of low-temperature brittle fracture when a through-crack occurs and a small leak occurs in the Type B compartment, through the leak detection, collection and treatment system, and to be able to accommodate low-temperature leaked liquid for no less than 15 days under the expected leakage amount.

[0004] In the design and construction of LNG carriers, to address the risk of LNG leakage from the Type B tank, a sump device is typically installed at the bottom to collect any liquefied LNG leaking from the Type B tank. This device ensures that even under extreme conditions such as a 15° heel, the leaked liquid will not overflow the sump and cause fatal damage to the hull structure, thus guaranteeing the safe passage of the vessel to the nearest port for repairs.

[0005] However, to maximize LNG cargo capacity, existing LNG carriers are designed to minimize the cargo space between the Type B tank and the hull structure, resulting in extremely limited vertical installation space at the bottom. Simultaneously, to avoid interference with the bottom support and related structures, the arrangement of the sump tray in length, width, and height is also strictly limited. Under these multiple spatial constraints, effectively increasing the effective volume and heat exchange area of ​​the sump tray device, thereby improving the LNG evaporation rate in the event of a Type B tank leak, has become a critical technical problem that urgently needs to be solved to ensure the overall safety performance of LNG carriers. Summary of the Invention

[0006] To address the deficiencies in the existing technology, this application provides a collection tray device and method for receiving LNG leaks from Type B tanks, thereby solving the technical problems such as the limited volume of the collection tray devices for receiving LNG leaks from Type B tanks in the existing technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A collection tray device for receiving LNG leaks from a Type B LNG compartment includes a collection tray body and a collection tray support. The collection tray support is fixed to the hull bottom structure of the ship. The collection tray body is installed on the hull bottom structure via the collection tray support. The collection tray body is a cubic structure with an open top. The collection tray body is located below the Type B LNG compartment structure. The collection pipe on the Type B LNG compartment structure is located within the space of the collection tray body. The collection tray body includes a rectangular base plate and surrounding plates vertically arranged around the base plate. The lower surface of the base plate has two or more grooves. The lower end of the groove is flush with the lower surface of the base plate. The groove is parallel to the long side of the base plate, and the length of the groove is equal to the length of the long side of the base plate. The groove can slide on the top of the collection tray support. When the collection tray support supports the collection tray body, collection tray support is provided at both ends of the groove. The top of the collection tray support is inserted into the groove, and the collection tray support is fixedly connected to the base plate.

[0008] In one embodiment, the groove is symmetrically arranged about the central axis of the base plate.

[0009] In one embodiment, the cross-section of the groove is rectangular or trapezoidal with a longer upper base and a shorter lower base.

[0010] In one embodiment, the liquid collection tray support is fixed at the intersection of the strong frame of the ship's inner bottom structure.

[0011] In one embodiment, the liquid collection tray support includes a pressure-bearing wooden block and a support structure. The support structure is a U-shaped metal frame fixed to the ship's inner bottom structure. The lower end of the pressure-bearing wooden block is placed inside the support structure. Epoxy material is filled between the pressure-bearing wooden block and the support structure and the ship's inner bottom structure to fix the pressure-bearing wooden block to the ship's inner bottom structure. When the liquid collection tray support supports the liquid collection tray body, epoxy material is filled between the pressure-bearing wooden block and the groove to fix the pressure-bearing wooden block to the bottom plate.

[0012] In one embodiment, a limiting structure is fixedly provided at the end of the base plate. The limiting structure is a mounting plate. Limiting structures are provided on both the left and right sides of the end of the groove. The limiting piece is U-shaped. The limiting structure and the limiting piece are detachably connected. When the liquid collection tray support supports the liquid collection tray body, the end of the pressure wood is flush with the end of the base plate. The limiting piece and the limiting structure are fixedly connected, and the bottom of the limiting piece abuts against the end of the groove.

[0013] In one embodiment, the limiting structure is provided with mounting holes, and the side of the limiting piece is provided with mounting holes, and the limiting structure is bolted to the limiting piece.

[0014] In one embodiment, an insulating layer is provided between the ship's inner bottom structure and the liquid collection tray body. The insulating layer is located between the pressure-bearing timbers, and the perimeter of the insulating layer is aligned with the perimeter of the liquid collection tray body. The height of the insulating layer is the height difference between the liquid collection tray body and the ship's inner bottom structure.

[0015] This application also provides an installation method for the above-mentioned collection tray device for receiving LNG leaks in Type B tanks, including the following steps: Step 1: Set the position of the liquid collection pipe at the bottom of the B-type compartment structure, find the corresponding position of the liquid collection tray body on the bottom structure of the hull, locate the installation position of the liquid collection tray body, so that the support structure is located at the intersection of the strong frame of the hull structure, determine the position of the laminated wood, and carry out the welding of the corresponding components of the support structure. Step 2: Complete the fabrication of the LNG collection tray body, ensuring that the bottom plate of the LNG collection tray body is fabricated in strict accordance with the number and depth of the grooves to meet the evaporation of leaked LNG in the B-type compartment for 15 days. Position the limiting structure according to the position of the pressure-bearing wood at the bottom of the LNG collection tray. Step 3: Install the pressure-bearing timber into the supporting structure. Fill the space between the pressure-bearing timber and the supporting structure and the ship's inner bottom structure with epoxy material to secure the pressure-bearing timber to the ship's inner bottom structure. Fill the space between the pressure-bearing timber and the groove with epoxy material to secure the pressure-bearing timber to the bottom plate. Securely connect the limiting plate and the limiting structure, ensuring that the bottom of the limiting plate rests against the end of the groove. Step 4: If it is necessary to disassemble the liquid collection tray body, separate the limiting plate and the limiting structure, and slide the liquid collection tray body horizontally to separate the liquid collection tray body from the supporting structure.

[0016] In one implementation, in step three, after fixing the pressure-bearing timber to the ship's inner bottom structure and before filling the space between the pressure-bearing timber and the groove with epoxy material, an insulating layer is laid on the surface of the ship's inner bottom structure. The insulating layer is placed between the pressure-bearing timbers, and the perimeter of the insulating layer is aligned with the perimeter of the liquid collection tray body. The height of the insulating layer is the height difference between the liquid collection tray body and the ship's inner bottom structure.

[0017] Compared with the prior art, this application has at least the following beneficial effects: In this application, a groove is provided on the bottom plate of the sump body that can slide on the top of the sump support. Compared with the bottom plate located at the top of the sump support in the prior art, this application makes most of the bottom plate lower than the top of the sump support, reducing the average distance between the bottom plate of the sump body and the bottom structure of the ship's interior. This increases the volume of the sump body within a limited space, meeting the requirement that the sump can accommodate LNG leakage within 15 days. The bottom plate area with the groove in this application forms a protrusion, increasing the heat exchange area of ​​the sump and improving the LNG evaporation rate, providing sufficient time for the LNG ship to find a port for B-type tank maintenance. The groove in this application can slide on the top of the liquid collection tray support, which reduces the difficulty of loading and unloading the liquid collection tray body in a limited space. The installation time is not limited by the installation time of the B-type compartment, which facilitates the later inspection and replacement of the liquid collection tray. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the liquid collection tray device used to receive LNG leakage in the Type B tank in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the liquid collection tray in Embodiment 1 of this application; Figure 3 This is a top view of the liquid collection tray in Embodiment 1 of this application; Figure 4 This is a top view schematic diagram of the insulating layer in Embodiment 1 of this application; Figure 5 This is a side view schematic diagram of the insulating layer in Embodiment 1 of this application; Figure 6 This is a schematic diagram of the liquid collection tray device used to receive LNG leakage in the Type B compartment in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the liquid collection tray in Embodiment 2 of this application; Figure 8 This is a top view of the liquid collection tray in Embodiment 2 of this application; Reference numerals in the attached drawings: 1. Bottom structure of the hull; 2. Body of the liquid collection tray; 201. Bottom plate; 202. Cofferdam; 3. Pressure-bearing timber; 4. Support structure; 5. Epoxy material; 6. Groove; 7. Liquid collection pipe; 8. Insulation layer; 9. Type B compartment structure; 10. Limiting plate; 11. Limiting structure; 12. Insulation layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0020] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0022] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical connection or internal connection between two components. They can be direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. Example 1

[0024] This embodiment provides a collection tray device for receiving LNG leaks from a Type B tank, such as... Figure 1-3As shown, the system includes a collection tray body 2 and a collection tray support base. The collection tray support base is fixed to the hull bottom structure 1. The collection tray body 2 is installed on the hull bottom structure 1 via the collection tray support base. The collection tray body 2 is a cubic structure with an open top. The collection tray body 2 is located below the B-type compartment structure 9. The collection pipe 7 on the B-type compartment structure 9 is located within the space of the collection tray body 2. The collection tray body 2 includes a rectangular bottom plate 201 and surrounding plates 202 vertically arranged around the bottom plate. The lower surface of plate 201 is provided with two or more grooves 6. The lower end of the groove 6 is flush with the lower surface of the base plate 201. The groove 6 is parallel to the long side of the base plate 201. The length of the groove 6 is equal to the length of the long side of the base plate 201. The groove 6 can slide on the top of the liquid collection tray support. When the liquid collection tray support supports the liquid collection tray body 2, both ends of the groove 6 are provided with liquid collection tray support seats. The top of the liquid collection tray support seat is inserted into the groove 6. The liquid collection tray support seat is fixedly connected to the base plate 201.

[0025] The grooves 6 are symmetrically arranged about the central axis of the base plate 201, thereby ensuring uniform force on the liquid collection tray body 2. In this embodiment, two grooves 6 are provided on the lower surface of the base plate 201. The cross-section of the grooves 6 is rectangular to limit the displacement of the liquid collection tray body 2.

[0026] The sump support is fixed at the intersection of the strong frame of the ship's inner bottom structure 1 to prevent deformation of the ship's double bottom structure. The sump support includes a pressure-bearing timber 3 and a support structure 4. The support structure 4 is a U-shaped metal frame fixed to the ship's inner bottom structure 1. The lower end of the pressure-bearing timber 3 is placed inside the support structure 4. Epoxy material 5 is filled between the pressure-bearing timber 3 and the support structure 4, as well as between the ship's inner bottom structure 1, to fix the pressure-bearing timber 3 and the ship's inner bottom structure 1. When the sump support supports the sump body 2, epoxy material 5 is filled between the pressure-bearing timber 3 and the groove 6 to fix the pressure-bearing timber 3 and the bottom plate 201.

[0027] To enhance the stability of the connection between the liquid collection tray support and the liquid collection tray body 2 and improve the limiting effect on the liquid collection tray body 2, a limiting structure 11 is fixedly provided at the end of the base plate 201. The limiting structure 11 is a mounting plate. Limiting structures 11 are provided on both the left and right sides of the end of the groove 6. The limiting structure 11 is detachably connected to the limiting piece 10. The limiting piece 10 is U-shaped. When the liquid collection tray support supports the liquid collection tray body 2, the upper end of the pressure wood 3 is in the groove 6. The end of the pressure wood 3 is flush with the end of the base plate 201. The limiting piece 10 is fixedly connected to the limiting structure 11. The bottom of the limiting piece 10 abuts against the end of the groove 6.

[0028] An insulating layer 12 is provided between the ship's inner bottom structure 1 and the LNG collection tray body 2. The insulating layer 12 is located between the pressure-bearing timbers 3, and its perimeter is aligned with the perimeter of the LNG collection tray body 2. The height of the insulating layer 12 is the height difference between the LNG collection tray body 2 and the ship's inner bottom structure 1. By providing the insulating layer, the cold air inside the LNG collection tray is prevented from being transferred to the hull, thus preventing the LNG inside the LNG collection tray from being damaged by excessively low temperatures. The limiting structure 11 is provided with mounting holes, and the limiting plate 10 is provided with mounting holes on its side. The limiting structure 11 and the limiting plate 10 are bolted together.

[0029] This embodiment also provides an installation method for the above-mentioned liquid collection tray device for receiving LNG leaks in Type B tanks, including the following steps: Step 1: Set the position of the liquid collection pipe 7 at the bottom of the B-type compartment structure 9, and find the corresponding position of the liquid collection plate body 2 on the bottom structure 1 of the hull. Position the installation position of the liquid collection plate body 2 so that the support structure 4 is located at the intersection of the strong frame of the hull structure. Determine the position of the pressure-bearing timber 3 and carry out the welding of the corresponding components of the support structure 4. Step Two: Complete the fabrication of the LNG collection tray body 2, ensuring that the bottom plate 201 of the LNG collection tray body 2 is fabricated strictly according to the number and depth of its grooves 6 to meet the evaporation requirements of leaked LNG in the Type B tank for 15 days, based on the position of the pressure-bearing wood at the bottom of the LNG collection tray ( Figure 3 The limiting structure 11 is positioned within the range of the diagonal lines in the diagram. Step 3: Install the pressure-bearing timber 3 into the support structure 4. Fill the space between the pressure-bearing timber 3, the support structure 4, and the ship's inner bottom structure 1 with epoxy material 5 to fix the pressure-bearing timber 3 and the ship's inner bottom structure 1. Lay an insulation layer 12 on the surface of the ship's inner bottom structure 1. The insulation layer 12 is placed between the pressure-bearing timber 3, and its perimeter is aligned with the perimeter of the liquid collection tray body 2. The height of the insulation layer 12 is the height difference between the liquid collection tray body 2 and the ship's inner bottom structure 1. Fill the space between the pressure-bearing timber 3 and the groove 6 with epoxy material 5 to fix the pressure-bearing timber 3 and the bottom plate 201. Fix and connect the limiting plate 10 and the limiting structure 11 so that the bottom of the limiting plate 10 abuts against the end of the groove 6. Step 4: If it is necessary to disassemble the liquid collection tray body 2, separate the limiting plate 10 and the limiting structure 11, and slide the liquid collection tray body 2 horizontally to separate the liquid collection tray body 2 from the supporting structure 4. Example 2

[0030] This embodiment provides a collection tray device for receiving LNG leaks from a Type B tank, such as... Figure 4-5 As shown, unlike in Embodiment 1, the cross-section of the groove 6 is a trapezoid with a longer upper base and a shorter lower base. The upper part of the pressure-bearing wood 3 is a trapezoid that matches the shape of the groove 6. The trapezoidal groove 6 further enhances the stability of the connection between the liquid collection tray support and the liquid collection tray body 2. The other structures of the liquid collection tray device in this embodiment are the same as in Embodiment 1.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A collection tray device for receiving LNG leaks from a Type B tank, characterized in that, The system includes a collection tray body and a collection tray support. The collection tray support is fixed to the hull bottom structure, and the collection tray body is installed on the hull bottom structure via the collection tray support. The collection tray body is a cubic structure with an open top. The collection tray body is located below the B-type compartment structure. The collection pipe on the B-type compartment structure is located within the space of the collection tray body. The collection tray body includes a rectangular base plate and surrounding plates vertically arranged around the base plate. The lower surface of the base plate has two or more grooves. The lower end of the groove is flush with the lower surface of the base plate. The groove is parallel to the long side of the base plate, and the length of the groove is equal to the length of the long side of the base plate. The groove can slide on the top of the collection tray support. When the collection tray support supports the collection tray body, collection tray support is provided at both ends of the groove. The top of the collection tray support is inserted into the groove, and the collection tray support is fixedly connected to the base plate.

2. The liquid collection tray device for receiving LNG leaks from a Type B tank according to claim 1, characterized in that, The grooves are symmetrically arranged about the central axis of the base plate.

3. The liquid collection tray device for receiving LNG leaks from a Type B tank according to claim 2, characterized in that, The cross-section of the groove is rectangular or trapezoidal with a longer upper base and a shorter lower base.

4. The liquid collection tray device for receiving LNG leaks from a Type B tank according to claim 1, characterized in that, The liquid collection tray support is fixed at the intersection of the strong frame of the ship's inner bottom structure.

5. The liquid collection tray device for receiving LNG leaks from a Type B tank according to claim 1, characterized in that, The liquid collection tray support includes a pressure-bearing wooden block and a support structure. The support structure is a U-shaped metal frame fixed to the ship's inner bottom structure. The lower end of the pressure-bearing wooden block is placed inside the support structure. Epoxy material is filled between the pressure-bearing wooden block and the support structure and the ship's inner bottom structure to fix the pressure-bearing wooden block to the ship's inner bottom structure. When the liquid collection tray support supports the liquid collection tray body, epoxy material is filled between the pressure-bearing wooden block and the groove to fix the pressure-bearing wooden block to the bottom plate.

6. The collection tray device for receiving LNG leaks from a Type B tank according to claim 5, characterized in that, The bottom plate is fixedly equipped with a limiting structure, which is a mounting plate. Limiting structures are provided on both the left and right sides of the groove end. The limiting plate is U-shaped. The limiting structure and the limiting plate are detachably connected. When the liquid collection tray support supports the liquid collection tray body, the end of the pressure wood is flush with the end of the bottom plate. The limiting plate is fixedly connected to the limiting structure, and the bottom of the limiting plate abuts against the end of the groove.

7. The collection tray device for receiving LNG leaks from a Type B tank according to claim 6, characterized in that, The limiting structure is provided with mounting holes, and the side of the limiting piece is provided with mounting holes. The limiting structure and the limiting piece are bolted together.

8. The collection tray device for receiving LNG leaks from a Type B tank according to claim 6, characterized in that, An insulating layer is installed between the ship's inner bottom structure and the liquid collection tray body. The insulating layer is located between the pressure-bearing timbers, and its perimeter is aligned with the perimeter of the liquid collection tray body. The height of the insulating layer is the height difference between the liquid collection tray body and the ship's inner bottom structure.

9. The installation method of the sump tray device for receiving LNG leaks from a Type B tank according to any one of claims 6-8, characterized in that, Includes the following steps: Step 1: Set the position of the liquid collection pipe at the bottom of the B-type compartment structure, find the corresponding position of the liquid collection tray body on the bottom structure of the hull, locate the installation position of the liquid collection tray body, so that the support structure is located at the intersection of the strong frame of the hull structure, determine the position of the laminated wood, and carry out the welding of the corresponding components of the support structure. Step 2: Complete the fabrication of the LNG collection tray body, ensuring that the bottom plate of the LNG collection tray body is fabricated in strict accordance with the number and depth of the grooves to meet the evaporation of leaked LNG in the B-type compartment for 15 days. Position the limiting structure according to the position of the pressure-bearing wood at the bottom of the LNG collection tray. Step 3: Install the pressure-bearing timber into the supporting structure. Fill the space between the pressure-bearing timber and the supporting structure and the ship's inner bottom structure with epoxy material to secure the pressure-bearing timber to the ship's inner bottom structure. Fill the space between the pressure-bearing timber and the groove with epoxy material to secure the pressure-bearing timber to the bottom plate. Securely connect the limiting plate and the limiting structure, ensuring that the bottom of the limiting plate rests against the end of the groove. Step 4: If it is necessary to disassemble the liquid collection tray body, separate the limiting plate and the limiting structure, and slide the liquid collection tray body horizontally to separate the liquid collection tray body from the supporting structure.

10. The installation method according to claim 9, characterized in that, In step three, after fixing the pressure-bearing timber to the ship's inner bottom structure and before filling the space between the pressure-bearing timber and the groove with epoxy material, an insulation layer is laid on the surface of the ship's inner bottom structure. The insulation layer is placed between the pressure-bearing timbers, and the perimeter of the insulation layer is aligned with the perimeter of the liquid collection tray body. The height of the insulation layer is the height difference between the liquid collection tray body and the ship's inner bottom structure.

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