Independent cargo tank containment system and liquefied gas transport vessel

Abstract

The present invention provides an independent liquid cargo tank containment system and a liquefied gas transport ship, which relate to the field of ship technology. The independent liquid cargo tank containment system includes a heat insulation layer, a secondary barrier wall and a corrosion monitoring sensor; the secondary barrier wall is arranged on the outer side of the independent liquid cargo tank, and the corrosion monitoring probe of the corrosion monitoring sensor is installed between the inner side of the secondary barrier wall and the outer side of the independent liquid cargo tank; the heat insulation layer is installed on the outer side of the independent liquid cargo tank and is close to the secondary barrier wall. The liquefied gas transport ship includes the above-mentioned independent liquid cargo tank containment system. The present invention alleviates the technical problems in the prior art of the construction of the containment system of type A and type B independent liquid cargo tanks, such as the complex type of the containment system, the difficulty of construction, and the high construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to an independent liquid cargo tank containment system and a liquefied gas transport ship. Background Art

[0002] According to the regulations of the International Maritime Organization, the main types of liquid cargo tanks for ships transporting liquefied gases in bulk are membrane liquid cargo tanks and independent liquid cargo tanks. Independent liquid cargo tanks can be divided into three types: Type A, Type B and Type C; Type A requires a complete secondary barrier, Type B requires a partial secondary barrier, and Type C is a pressure vessel and does not require a secondary barrier. Since the IGC rules require that the secondary barrier be liquid-tight, when constructing the containment system of independent liquid cargo tanks of Type A and Type B, it is necessary to set up leakage channels or diversion spaces so that after cracks occur in the liquid tank, the leaked liquid can be detected in time and properly handled according to the process to avoid safety hazards, and support structures are set up to support the leakage channels or diversion spaces; then further insulation treatment is performed on the outer layer of the support structure, that is, the insulation material is prefabricated into a number of insulation blocks, and then the insulation blocks are assembled on the outer surface of the liquid tank by bolts, and buffer materials are used between the insulation blocks.

[0003] When constructing the enclosure system of type A and type B independent liquid cargo tanks in the above prior art, there are at least the disadvantages of complex enclosure system type, difficult construction and high construction cost. Summary of the invention

[0004] The object of the present invention is to provide an independent liquid cargo tank containment system and a liquefied gas transport ship to alleviate the technical problems existing in the prior art in the construction of the containment system of type A and type B independent liquid cargo tanks, such as complex containment system type, difficult construction and high construction cost.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides an independent liquid cargo tank containment system, which is installed on the outer side of an independent liquid cargo tank on a liquefied gas transport ship, and includes an insulation layer, a secondary barrier wall, and a corrosion monitoring sensor; wherein: the secondary barrier wall is arranged on the outer side of the independent liquid cargo tank, and the corrosion monitoring probe of the corrosion monitoring sensor is installed between the inner side of the secondary barrier wall and the outer side of the independent liquid cargo tank; the insulation layer is installed on the outer side of the independent liquid cargo tank and is close to the secondary barrier wall.

[0007] In an optional embodiment, the thermal insulation layer comprises a primary thermal insulation layer and a secondary thermal insulation layer, the primary thermal insulation layer is installed between the inner side of the secondary barrier wall and the outer side of the independent liquid cargo tank, and the secondary thermal insulation layer is installed on the outer side of the secondary barrier wall.

[0008] In an optional embodiment, the secondary heat insulation layer is bonded to the outer side surface of the secondary screen wall by adhesive.

[0009] In an optional embodiment, a reinforced skin is provided on the outer side surface of the primary thermal insulation layer and the outer side surface of the secondary thermal insulation layer.

[0010] In an optional embodiment, the independent liquid cargo tank containment system further comprises a bottom laminate block, wherein the bottom laminate block is disposed between the bottom inner side of the hull of the liquefied gas transport vessel and the outer side of the secondary insulation layer.

[0011] In an optional embodiment, the independent liquid cargo tank containment system further comprises a vertical support pad, wherein the vertical support pad is arranged between a side of the bottom laminate block close to the secondary insulation layer and an outer side surface of the independent liquid cargo tank.

[0012] In an optional embodiment, the independent liquid cargo tank containment system further includes a bottom anti-roll pad, which is arranged at the middle position of the bottom outer side surface of the independent liquid cargo tank and is clamped to the inner side surface of the hull; and / or, the independent liquid cargo tank containment system further includes a top anti-roll pad, which is arranged at the middle position of the top outer side surface of the independent liquid cargo tank and is clamped to the inner side surface of the hull. Among them, "and / or" means that the above-mentioned bottom anti-roll pad and top anti-roll pad are arranged at the same time or selectively.

[0013] In an optional embodiment, the independent liquid cargo tank containment system further comprises liquid cargo tank anti-buoyancy layer blocks and hull anti-buoyancy layer blocks;

[0014] The cargo tank anti-floating layer block is arranged on the outer side of the independent cargo tank, and the hull anti-floating layer block is arranged on the top inner side of the hull shell of the liquefied gas transport ship, and the cargo tank anti-floating layer block and the hull anti-floating layer block are spaced apart from each other in the vertical direction.

[0015] In a second aspect, an embodiment of the present invention provides a liquefied gas transport ship, comprising the independent liquid cargo tank containment system described in any one of the aforementioned embodiments.

[0016] In an optional embodiment, the hull of the liquefied gas transport vessel includes an outer hull and an inner hull, and the independent liquid cargo tank containment system is arranged inside the inner hull.

[0017] The embodiments of the present invention can achieve the following beneficial effects:

[0018] In a first aspect, an embodiment of the present invention provides an independent liquid cargo tank containment system, which is installed on the outer side of an independent liquid cargo tank on a liquefied gas transport ship, and includes an insulation layer, a secondary barrier wall, and a corrosion monitoring sensor; specifically, the secondary barrier wall is arranged on the outer side of the independent liquid cargo tank; the corrosion monitoring probe of the corrosion monitoring sensor is installed between the inner side of the secondary barrier wall and the outer side of the independent liquid cargo tank; the insulation layer is installed on the outer side of the independent liquid cargo tank and is close to the secondary barrier wall.

[0019] The embodiment of the present invention sets a corrosion monitoring probe of a corrosion monitoring sensor between the inner side of the secondary barrier wall and the outer side of the independent liquid cargo tank. Thus, the corrosion potential data obtained by the corrosion monitoring sensor can be used to monitor the corrosion condition of the independent liquid cargo tank in real time, and maintenance can be reasonably arranged before the cracks in the liquid tank penetrate, thereby avoiding the leakage of cargo from the root, thereby improving the safety of the A-type or B-type independent liquid cargo tank containment system. The above-mentioned technical scheme adopted in this embodiment changes the traditional A-type or B-type independent liquid cargo tank containment system, which adopts the concept of "drainage" for leaking cargo, and replaces it with a "plugging" strategy, canceling the design of the leakage channel or diversion space, thereby reducing the type complexity of the containment system, and then reducing the construction difficulty, which is conducive to reducing the construction period and reducing the construction cost.

[0020] In summary, the embodiments of the present invention at least alleviate the technical problems in the prior art of complex containment system types, difficult construction, and high construction costs when constructing the containment systems of type A and type B independent liquid cargo tanks; at the same time, this embodiment, by providing the above-mentioned corrosion monitoring instrument, can ensure the healthy operation of the liquid cargo tank and eliminate the hidden dangers of traditional liquid cargo tanks operating with cracks.

[0021] The second aspect of an embodiment of the present invention further provides a liquefied gas transport ship, comprising the independent liquid cargo tank containment system provided by the first aspect; since the liquefied gas transport ship provided by the embodiment of the present invention comprises the independent liquid cargo tank containment system provided by the first aspect, the liquefied gas transport ship provided by the embodiment of the present invention can achieve all the beneficial effects that can be achieved by the independent liquid cargo tank containment system provided by the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A cross-sectional view of the installation structure of the independent liquid cargo tank containment system provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the installation of the main thermal insulation layer of the independent liquid cargo tank containment system provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the installation of a secondary barrier wall of an independent liquid cargo tank containment system provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the installation of a secondary insulation layer of an independent liquid cargo tank containment system provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the installation of the bottom pad of the independent liquid cargo tank containment system provided by an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the installation of the top gasket of the independent liquid cargo tank containment system provided in an embodiment of the present invention.

[0029] Icons: 1-outer bottom plate; 2-side outer plate; 3-main deck; 4-inner bottom plate; 5-hopper tank inclined plate; 6-inner hull plate; 7-inner deck; 8-independent liquid cargo tank; 9-primary insulation layer; 10-secondary barrier; 11-secondary insulation layer; 12-corrosion monitoring probe; 13-bottom anti-roll pad; 14-vertical support pad; 15-bottom laminated block; 16-top anti-roll pad; 17-liquid cargo tank anti-floating laminated block; 18-hull anti-floating laminated block. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] Embodiment 1

[0038] This embodiment provides an independent liquid cargo tank containment system. Figure 1 and Figure 3 The independent liquid cargo tank containment system is installed on the outer side of the independent liquid cargo tank 8 on the liquefied gas transport ship, and includes a thermal insulation layer, a secondary barrier wall 10 and a corrosion monitoring sensor; specifically, the secondary barrier wall 10 is arranged on the outer side of the independent liquid cargo tank 8, and the secondary barrier wall 10 can be arranged at any position of the independent liquid cargo tank 8. The secondary barrier wall 10 shown in the figure is located in the bottom high stress area of ​​the independent liquid cargo tank 8; the corrosion monitoring probe 12 of the corrosion monitoring sensor is installed between the inner side of the secondary barrier wall 10 and the outer side of the independent liquid cargo tank 8; the thermal insulation layer is installed on the outer side of the independent liquid cargo tank 8 and is close to the secondary barrier wall 10.

[0039] Among them: the secondary screen wall 10 can be composed of glass cloth, stainless steel or aluminum alloy plate. The corrosion monitoring sensor refers to an instrument with a corrosion monitoring probe 12, which has a variety of application models. The corrosion monitoring probe 12 detects the corrosion situation and transmits data for corrosion monitoring. It is a relatively mature corrosion monitoring instrument at present, and is commonly seen but not limited to CST1808 coating impedance online corrosion monitor or other types of corrosion monitoring sensors; preferably, a corrosion monitoring sensor with a coating probe is used.

[0040] In this embodiment, a corrosion monitoring probe 12 of a corrosion monitoring sensor is arranged between the inner side of the secondary barrier wall 10 and the outer side of the independent liquid cargo tank 8. Thus, the corrosion potential data obtained by the corrosion monitoring sensor can be used to monitor the corrosion condition of the independent liquid cargo tank 8 in real time, and maintenance can be reasonably arranged before the cracks in the liquid tank penetrate, thereby avoiding the leakage of cargo from the root, thereby improving the safety of the A-type or B-type independent liquid cargo tank containment system. The above-mentioned technical scheme adopted in this embodiment changes the traditional A-type or B-type independent liquid cargo tank containment system, which adopts the concept of "drainage" for leaking cargo, and replaces it with a "plugging" strategy, canceling the design of the leakage channel or diversion space, thereby reducing the complexity of the containment system, and then reducing the construction difficulty, which is conducive to reducing the construction period and reducing the construction cost.

[0041] In summary, this embodiment at least alleviates the technical problems in the prior art of complex containment system types, difficult construction, and high construction costs when constructing the containment systems of type A and type B independent liquid cargo tanks; at the same time, this embodiment, by providing the above-mentioned corrosion monitoring instrument, can ensure the healthy operation of the liquid cargo tank and eliminate the hidden dangers of traditional liquid cargo tanks operating with cracks.

[0042] Reference Figure 1 , Figure 2 and Figure 4 In the optional implementation of this embodiment, it is more preferred that the above-mentioned thermal insulation layer includes a main thermal insulation layer 9 and a secondary thermal insulation layer 11, the main thermal insulation layer 9 is installed between the inner side of the secondary barrier wall 10 and the outer side of the independent liquid cargo tank 8, and the secondary thermal insulation layer 11 is installed on the outer side of the secondary barrier wall 10. By arranging two thermal insulation layers respectively located on the inner and outer sides of the secondary barrier wall 10, the thermal insulation effect is improved, wherein the thickness of the secondary thermal insulation layer 11 can be but is not limited to being set to about 120 mm, and the secondary thermal insulation layer 11 can be only set at the bottom of the ship and near the bottom of the ship, and other positions may not be set, and correspondingly, the thickness of the main thermal insulation layer 9 can be appropriately reduced at the position where the secondary thermal insulation layer 11 is set.

[0043] For ease of construction, in the optional implementation of this embodiment, it is more preferred that the secondary insulation layer 11 is bonded to the outer side of the secondary screen wall 10 by adhesive, eliminating the traditional bolt connection method, thereby further reducing the difficulty of installation and facilitating further saving of construction costs.

[0044] Preferably, reinforced skins are provided on the outer sides of the main insulation layer 9 and the secondary insulation layer 11. The reinforced skin on the outer side of the main insulation layer 9 supports the main insulation layer 9, and the reinforced skin on the outer side of the secondary insulation layer 11 supports the secondary insulation layer 11, the secondary screen wall 10 and the main insulation layer 9 as well as provides waterproofing.

[0045] In addition, refer to Figure 1 , Figure 5 and Figure 6 In an optional implementation of this embodiment, the independent liquid cargo tank containment system also includes a bottom pad and a top pad.

[0046] Specifically:

[0047] Reference Figure 1 and Figure 5 The bottom pads include a bottom laminate block 15, a vertical support pad 14 and a bottom anti-roll pad 13. The bottom laminate block 15 is arranged between the bottom inner side of the hull of the liquefied gas transport ship and the outer side of the secondary insulation layer 11; the vertical support pad 14 is arranged between the side of the bottom laminate block 15 close to the secondary insulation layer 11 and the outer side of the independent liquid cargo tank 8; in this way, the hull can not only support the independent liquid cargo tank 8, but also prevent the independent liquid cargo tank 8 from directly contacting the hull and enduring low temperature, thereby avoiding the hull structure from being brittlely damaged by low temperature. The bottom anti-roll pad 13 is arranged in the middle of the bottom outer side of the independent liquid cargo tank 8 and is clamped to the inner side of the hull, mainly bearing the lateral load generated when the hull moves.

[0048] Reference Figure 1 and Figure 6 The top pads include a top anti-roll pad 16, a liquid cargo tank anti-floating laminated block 17 and a hull anti-floating laminated block 18. The top anti-roll pad 16 is arranged at the middle position of the top outer side of the independent liquid cargo tank 8 and is clamped to the inner side of the hull shell, and mainly bears the lateral load generated when the hull moves; the liquid cargo tank anti-floating laminated block 17 is arranged on the outer side of the independent liquid cargo tank 8, and the hull anti-floating laminated block 18 is arranged on the top inner side of the hull shell of the liquefied gas transport ship, and the liquid cargo tank anti-floating laminated block 17 and the hull anti-floating laminated block 18 are spaced apart from each other in the vertical direction, and the spacing distance can be but is not limited to about 50 mm. By arranging the liquid cargo tank anti-floating laminated block 17 and the hull anti-floating laminated block 18, when the hull cargo tank is flooded, the independent liquid cargo tank 8 can be prevented from directly contacting the hull, and the hull structure can be prevented from being damaged by low temperature.

[0049] Embodiment 2

[0050] This embodiment provides a liquefied gas transport ship, which includes the independent liquid cargo tank containment system provided by any optional implementation manner in Example 1.

[0051] Preferably, the hull of the liquefied gas transport vessel comprises an outer hull and an inner hull, and the independent liquid cargo tank containment system is arranged inside the inner hull. Specifically, Figure 1 As shown, the outer hull includes an outer bottom plate 1, a side outer plate 2, and a main deck 3 connected in sequence; the inner hull includes an inner bottom plate 4, a hopper tank inclined plate 5, an inner shell plate 6, and an inner deck 7 connected in sequence; and an independent liquid cargo tank 8 is arranged in the hull cargo space inside the inner hull. By placing the independent liquid cargo tank 8 on the double-bottom and double-hull hull, the safety factor is large, which can effectively reduce the risk of collision and penetration.

[0052] Since the liquefied gas transport ship provided in this embodiment includes the independent liquid cargo tank containment system described in Example 1, the liquefied gas transport ship provided in this embodiment can achieve all the beneficial effects that the independent liquid cargo tank containment system in Example 1 can achieve, and its specific structure and achievable effects can be obtained by referring to the various optional or preferred implementations in Example 1.

[0053] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. An independent liquid cargo tank containment system, installed on the outer side of an independent liquid cargo tank (8) on a liquefied gas transport ship, characterized in that: The independent liquid cargo tank containment system comprises a thermal insulation layer, a secondary barrier (10) and a corrosion monitoring sensor; The secondary barrier (10) is arranged on the outer side of the independent liquid cargo tank (8); The corrosion monitoring probe (12) of the corrosion monitoring sensor is installed between the inner side surface of the secondary barrier wall (10) and the outer side surface of the independent liquid cargo tank (8); The heat insulation layer is installed on the outer side of the independent liquid cargo tank (8) and is in close contact with the secondary barrier wall (10).

2. The independent liquid cargo tank containment system according to claim 1, characterized in that: The thermal insulation layer comprises a main thermal insulation layer (9) and a secondary thermal insulation layer (11), wherein the main thermal insulation layer (9) is installed between the inner side of the secondary barrier wall (10) and the outer side of the independent liquid cargo tank (8), and the secondary thermal insulation layer (11) is installed on the outer side of the secondary barrier wall (10).

3. The independent liquid cargo tank containment system according to claim 2, characterized in that: The secondary heat insulation layer (11) is bonded to the outer side surface of the secondary screen wall (10) by adhesive.

4. The independent liquid cargo tank containment system according to claim 2, characterized in that: Reinforced skins are provided on the outer side of the primary heat insulation layer (9) and the outer side of the secondary heat insulation layer (11).

5. The independent liquid cargo tank containment system according to claim 2, characterized in that: The independent liquid cargo tank containment system further comprises a bottom laminate block (15), wherein the bottom laminate block (15) is arranged between the bottom inner side of the hull of the liquefied gas transport ship and the outer side of the secondary insulation layer (11).

6. The independent liquid cargo tank containment system according to claim 5, characterized in that: The independent liquid cargo tank containment system further comprises a vertical support pad (14), wherein the vertical support pad (14) is arranged between a side of the bottom laminate block (15) close to the secondary insulation layer (11) and an outer side surface of the independent liquid cargo tank (8).

7. The independent liquid cargo tank containment system according to claim 1, characterized in that: The independent liquid cargo tank containment system further comprises a bottom anti-roll pad (13), wherein the bottom anti-roll pad (13) is arranged at a middle position of the bottom outer side surface of the independent liquid cargo tank (8) and is clamped to the inner side surface of the hull; And / or, the independent liquid cargo tank containment system further comprises a top anti-roll pad (16), wherein the top anti-roll pad (16) is arranged at a middle position of the top outer side surface of the independent liquid cargo tank (8) and is clamped to the inner side surface of the hull.

8. The independent liquid cargo tank containment system according to claim 1, characterized in that: The independent liquid cargo tank containment system further comprises a liquid cargo tank anti-buoyancy layer block (17) and a hull anti-buoyancy layer block (18); The cargo tank anti-floating layer block (17) is arranged on the outer side of the independent cargo tank (8), and the hull anti-floating layer block (18) is arranged on the top inner side of the hull shell of the liquefied gas transport ship, and the cargo tank anti-floating layer block (17) and the hull anti-floating layer block (18) are spaced apart from each other in the vertical direction.

9. A liquefied gas transport ship, characterized in that: An independent liquid cargo tank containment system comprising any one of claims 1 to 8.

10. The liquefied gas transport ship according to claim 9, characterized in that: The hull of the liquefied gas transport ship comprises an outer hull and an inner hull, and the independent liquid cargo tank containment system is arranged inside the inner hull.

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