WO2019091308A1

WO2019091308A1 - B-type lng hold containment system

Info

Publication number: WO2019091308A1
Application number: PCT/CN2018/112899
Authority: WO
Inventors: 金燕子; 徐岸南; 张汇平; 唐永生; 宋忠兵; 严磊
Original assignee: 沪东中华造船(集团)有限公司
Priority date: 2017-11-10
Filing date: 2018-10-31
Publication date: 2019-05-16
Also published as: KR20200060507A; CN108146583B; KR102128507B1; CN108146583A

Abstract

Disclosed is a B-type LNG hold containment system, comprising a B-type liquid cargo hold, a ship hull structure (5) provided outside the B-type liquid cargo hold, and a holding device and a pressure confining mechanism provided in an empty hold between the B-type liquid cargo hold and the ship hull structure. The B-type liquid cargo hold comprises an insulating layer (1), a leakage channel (2) and a liquid cargo hold body (3) provided successively from the outside to the inside. Support blocks (14) distributed equidistantly are fixed in the leakage channel (2). The top of the leakage channel (2) is provided with a vent pipe (13) communicating with a gas main pipe outside the ship hull structure, the bottom is provided with a bearing interface (15), and the holding device communicates with the bearing interface (15). The containment system has a simple structure, is low in cost, is reliable in terms of safety, and effectively solves the problems of storage and leakage prevention.

Description

B type LNG cabin enclosure system

Technical field

The invention relates to the technical field of liquefied natural gas storage and transportation equipment, in particular to a B-type LNG tank enclosure system.

Background technique

As a green, clean and high-calorific energy source, LNG demand is growing rapidly in China, and the gap between supply and demand is rapidly expanding. Therefore, by introducing natural gas resources from overseas, adjusting the energy structure, making up for energy shortages, and meeting the increasing demand for emerging energy in the national economy, it has become an important decision in China's energy strategy. However, liquefied natural gas is stored at an ultra-low temperature of minus 163 ° C. Therefore, the structural type of the cargo tank is very important.

The liquid cargo containment systems for large LNG ships currently used in real ships are spherical tank type (MOSS), membrane type (Membrane) and SPB type. The spherical tank type cargo tank is developed by Norwegian Rosenberg Company. The shape of the cargo tank is spherical, the cargo tank is not loaded with liquid level limitation, the storage tank material is aluminum alloy A5083, and the outer periphery is covered by polyurethane insulating material, which has high cost and low safety. The film-type cargo hold was developed by the French company GTT, and has the NO.96, Mark III and CS1 types. All three forms use a 0.7 mm thick metal film as the cargo lining, with insulation and secondary insulation. After the layers are fixed to each other, they are closely connected with the hull, but the metal film is limited in its ability to withstand sloshing loads, and the structure of the cargo hold is complex and the construction period is long. The SPB cargo tank is a kind of cargo tank developed by Ishikawashima Heavy Industries (IHI). It is made of aluminum alloy and has a complex structure and high cost.

Summary of the invention

It is an object of the present invention to overcome the deficiencies of the prior art and to design a B-type LNG tank containment system.

In order to achieve the above object, the technical solution adopted by the present invention is:

A type B LNG tank containment system comprising a type B cargo tank, a hull structure disposed outside the type B cargo tank, and a collecting device and a pressure receiving mechanism disposed in the empty space between the type B cargo tank and the hull structure The type B cargo tank comprises an insulation layer, a leakage passage and a cargo tank body arranged in order from the outside to the inside, wherein the leakage passage is fixed with an equally spaced support block, the upper end surface of the support block and the inner side wall of the insulation layer The phase fixing and the lower end surface are fixed to the outer side wall of the cargo tank body, and the pressure receiving mechanism comprises a plurality of pressure receiving units arranged at equal intervals, and the upper end faces of each pressure receiving unit are fixed to the outer side wall of the insulating layer The end faces are fixed with the hull structure; the top of the leakage passage is provided with a venting pipe which communicates with the gas main pipe outside the hull structure, and the bottom is provided with a bearing interface, and the collecting device is connected with the bearing interface.

Preferably, the pressure receiving unit comprises a base and a pressure receiving wood, the base comprises two cross-fixed support plates and a bearing plate, the support plate is vertically fixed on the inner side wall of the hull structure, The bearing plate is fixed on the top of the supporting plate, and the supporting wood is fixed on the upper surface of the bearing plate, and the upper end surface of the supporting wood is fixed to the outer side wall of the insulating layer.

Preferably, the two support plates are identical in shape and size, and each of the support plates has a rectangular plate provided with an inclined chamfered upper portion.

Preferably, the collecting device comprises a collecting box, a control valve, a receiving tube, an ejector, a discharge tube and a temperature sensor, wherein the top of the collecting box is provided with a collecting port, and a control valve is fixed at the collecting port The control valve is fixedly connected with the receiving pipe, and the receiving pipe is connected with the bearing interface at the bottom of the leakage channel; the lower end of the collecting box is provided with a discharge port, the injector is fixed at the discharge port, and the injector is fixedly connected with the discharge pipe to discharge The tube extends to the exterior of the hull structure and is in communication with the liquid manifold; the temperature sensor is attached to the tank of the collecting box.

Preferably, a hazardous gas detector is fixed to the vent tube.

Preferably, the cargo tank body includes an inner cavity having an octagonal longitudinal section and a dome structure extending from an upper end of the inner cavity.

Preferably, the shape of the leakage passage and the insulating layer are the same as the shape of the cargo tank body.

Preferably, the cargo tank body is made of 9% nickel steel.

Preferably, the collecting device is two or four, and the number of collecting devices is the same as the number of the receiving interfaces.

Positive beneficial effects of the invention:

1. The invention has the advantages of simple structure and low cost, and solves the problem of LNG storage and leakage prevention. By providing a hollow space between the B type cargo tank and the hull structure, the B type liquid cargo tank can be effectively prevented from being impacted after the collision occurs, and retained. There is enough cache space.

2. A plurality of equally spaced support blocks are arranged in the leakage channel between the insulating layer and the cargo tank body, and a pressure bearing mechanism is arranged in the empty space between the B type cargo tank and the hull structure, which can perform the B type liquid cargo tank Support, effectively prevent the movement of the B-type cargo tank and improve the anti-sloshing characteristics of the enclosure system.

3. Two or four collecting devices for preventing leakage of LNG are placed in the empty space between the type B cargo tank and the hull structure. Even if there is leakage, the leaked LNG will be transported to the deck through the ejector on the collecting device. In the liquid manifold, the safety of the hull structure is ensured, the reliability of the entire enclosure system is improved, and the utility model has high practical value.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

2 is a schematic structural view of a susceptor.

The specific meanings of the numbers in the figure are: 1 is the insulation layer, 2 is the leakage channel, 3 is the cargo tank body, 4 is the empty compartment, 5 is the hull structure, 6 is the receiving pipe, 7 is the control valve, 8 is the discharge pipe, 9 For the injector, 10 is the collecting box, 11 is the temperature sensor, 12 is the dangerous gas detector, 13 is the venting tube, 14 is the supporting block, 15 is the bearing interface, 16 is the pressure wood, 17 is the base, 18 is The dome structure, 19 is a pressure bearing unit, 20 is a support plate, 21 is a bearing plate, 22 is a collecting port, 23 is a discharge port, and 24 is an inner cavity.

Detailed ways

The present invention will be described below by way of specific embodiments shown in the accompanying drawings. However, it should be understood that the description is only illustrative, and is not intended to limit the scope of the invention. In addition, descriptions of well-known structures and techniques are omitted in the following description in order to avoid unnecessarily obscuring the inventive concept.

The present embodiment is described with reference to Figs. 1 and 2, and the B-type LNG tank enclosure system of the present invention includes a B-type cargo tank, a hull structure 5, a collecting device, and a pressure receiving mechanism. The hull structure 5 is arranged on the outer side of the B type cargo tank, and the empty tank 4 is arranged between the hull structure 5 and the B type cargo tank, and the collecting device and the pressure receiving mechanism are all arranged in the empty tank; the hull structure 4 and the B type cargo tank The empty compartment 4 is provided to effectively prevent the B-type cargo tank from being impacted after the collision, so that it has enough buffer space. The collecting device is mainly used to prevent leakage of LNG. When a leak occurs, the leaked LNG flows into the collecting device through the leaking passage inside the B-type cargo tank, and is transported to the liquid on the deck through the injector on the collecting device. In the main pipe, the safety of the hull structure is ensured and the reliability of the entire enclosure system is improved. The pressure-bearing mechanism is mainly used to support the B-type cargo tank and improve the anti-sloshing characteristics of the enclosure system.

The type B cargo tank includes an insulation layer 1, a leakage passage 2 and a cargo tank body 3 which are disposed in order from the outside to the inside. The shape of the leakage passage 2 and the insulation layer 1 are the same as the shape of the cargo tank body 3, and the leakage passage 2 The top portion is provided with a gas permeable pipe 13 communicating with a gas main pipe outside the hull structure, and a bottom portion is provided with a socket 15, and the collecting device is in communication with the socket 15 . The longitudinal section of the body cavity 24 of the cargo tank body is octagonal and the upper end of the inner cavity extends outwardly to have a dome structure 18. Since the shape of the leaking passage 2 is the same as the shape of the cargo tank body 3, the leakage passage is The top of 2 also has a dome structure. When a small amount of leakage occurs, the leaked natural gas evaporates and condenses to the dome structure at the top of the leak passage 2, and is discharged from the vent pipe 13 into the gas manifold. A plurality of equally spaced support blocks 14 are fixed in the leakage channel 2. The upper end surface of the support block 14 is fixed to the inner side wall of the insulating layer 1, and the lower end surface is fixed to the outer side wall of the cargo tank body 3. In order to increase the safety of the containment system, a hazardous gas detector 12 can be attached to the venting tube 13 for real-time detection of the leaked gas.

Since LNG is a cryogenic liquid of -163 ° C, the material of the cargo tank that requires direct contact with the LNG liquid can meet the requirements of low temperature plasticity, and can overcome the expansion and contraction problem from normal temperature to low temperature; and the selection of insulation materials should consider the cargo compartment. Structural types and required evaporation rates and other issues. In the embodiment, the cargo tank body 3 is made of 9% nickel steel, and the insulating material in the insulating layer is made of polyurethane foam. The heat insulating material is mainly installed at the bottom and the side of the cargo tank, which not only satisfies the high heat preservation performance, It can also withstand the strength and rigidity of the construction load.

In order to support the B-type cargo tank, a pressure-receiving mechanism may be provided at the bottom of the Type B cargo tank (ie, the pressure-bearing mechanism is fixed in the empty tank between the Type B cargo tank and the hull structure), the pressure-receiving mechanism includes several The pressure receiving units 19 are equally spaced, and the upper end faces of each of the pressure receiving units 19 are fixed to the outer side walls of the insulating layer 1, and the lower end faces are fixed to the hull structure 5. The pressure receiving unit 19 includes a base 17 and a pressure receiving wood 16, and the base 17 is composed of two cross-fixed support plates 20 and a bearing plate 21, and the shape and size of the two support plates 20 are completely In the same embodiment, in the embodiment, the two support plates 20 each adopt a rectangular plate provided with an inclined chamfer at the upper portion. The two support plates 20 are vertically fixed on the inner side wall of the hull structure 5, and the bearing plate 21 is fixed on the top of the two support plates 20. The bearing plate 21 and the two support plates 20 are perpendicular to each other, and the pressure is supported. The wood 16 is fixed to the upper surface of the pressure receiving plate 21, and the upper end surface of the pressure receiving wood 16 is fixed to the outer side wall of the insulating layer 1.

The bottom of the leakage channel 2 is provided with a plurality of receiving interfaces 15, the number of collecting devices being the same as the number of the receiving interfaces 15, and preferably, the receiving interfaces 15 can be arranged in two or four, each receiving port 15 A collecting device is fixed. The collecting device comprises a collecting box 10, a control valve 7, a receiving tube 6, an ejector 9, a discharge tube 8 and a temperature sensor 11, and a collecting port 22 is opened at the top of the collecting box 10, and the collecting port 22 is opened. A control valve 7 is fixed, the control valve 7 is fixedly connected with the receiving pipe 6, and the receiving pipe 6 is in communication with the bearing port 15 at the bottom of the leakage passage, and the control valve 7 can control the opening and closing of the collecting device. The lower end of the collecting box 10 is provided with a discharge port 23, and an ejector 9 is fixed at the discharge port 23, and the ejector 9 is fixedly connected with the discharge pipe 8, and the discharge pipe 8 extends to the outside of the hull structure and communicates with the liquid main pipe; The temperature sensor 11 is fixed to the casing of the collecting box 10. When there is a large amount of LNG leakage, the leaked liquid can flow to the bottom through the leak passage 2, and flow from the bearing port 15 into the collecting device, and then through the ejector 9 of the collecting device to the liquid manifold on the deck, thus ensuring The safety of the hull structure improves the reliability of the entire enclosure system and has high practical value.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand The invention is not limited to the spirit of the technical solutions of the present invention, and should be included in the scope of the technical solutions claimed in the present invention.

Claims

A type B LNG tank enclosure system comprising a type B cargo tank, a hull structure (5) disposed outside the type B cargo tank, and an empty space disposed between the type B cargo tank and the hull structure a collecting device and a pressure receiving mechanism, the type B cargo tank comprising an insulating layer (1), a leaking passage (2) and a cargo tank body (3) arranged in order from the outside to the inside, wherein the leaking passage (2) is fixed An equally spaced support block (14) having an upper end surface fixed to the inner side wall of the insulating layer (1) and a lower end surface fixed to the outer side wall of the cargo tank body (3), said bearing The mechanism comprises a plurality of equally spaced pressure receiving units (19), the upper end faces of each pressure receiving unit (19) are fixed to the outer side wall of the insulating layer (1), and the lower end faces are fixed to the hull structure (5) The top of the leakage passage (2) is provided with a gas permeable pipe (13) communicating with a gas manifold outside the hull structure, and a bottom receiving port (15), and the collecting device is in communication with the socket (15).
A type B LNG cabin containment system according to claim 1, wherein said pressure receiving unit (19) comprises a base (17) and a pressure receiving wood (16), said base (17) comprising two a cross-fixed support plate (20) and a bearing plate (21), the support plate (20) is vertically fixed on the inner side wall of the hull structure (5), and the bearing plate (21) is fixed on the support plate ( At the top of 20), the pressure-bearing wood (16) is fixed on the upper surface of the bearing plate (21), and the upper end surface of the pressure-bearing wood (16) is fixed to the outer side wall of the insulating layer (1).
The B-type LNG tank enclosure system according to claim 2, wherein the two support plates are identical in shape and size, and each of the support plates is formed by a rectangular plate having an inclined chamfered upper portion.
The B-type LNG tank enclosure system according to claim 1, wherein the collecting device comprises a collecting box (10), a control valve (7), a receiving tube (6), an injector (9), The discharge pipe (8) and the temperature sensor (11), the top of the collecting box (10) is provided with a collecting port (22), and the control valve (7) is fixed at the collecting port (22), and the control valve (7) ) is fixedly connected with the receiving pipe (6), and the receiving pipe (6) is connected with the bearing interface (15) at the bottom of the leakage passage; the lower end of the collecting box (10) is provided with a discharging port (23), and the discharging port (23) An ejector (9) is fixed, the ejector (9) is fixedly connected to the discharge pipe (8), and the discharge pipe (8) extends to the outside of the hull structure and communicates with the liquid manifold; the temperature sensor (11) is fixed On the box of the collection box (10).
The B-type LNG tank enclosure system according to claim 1, characterized in that the gas permeable pipe (13) is fixed with a dangerous gas detector (12).
The B-type LNG tank enclosure system according to claim 1, wherein the cargo tank body (3) comprises an inner cavity (24) having an octagonal longitudinal section and a dome extending from an upper end of the inner cavity Structure (18).
The B-type LNG tank enclosure system according to claim 6, wherein the leakage passage (2) and the insulating layer (1) have the same shape as the cargo tank body (3).
The B-type LNG tank containment system according to claim 7, characterized in that the cargo tank body (3) is made of 9% nickel steel.
The B-type LNG tank containment system according to claim 1, wherein the collecting device is two or four, and the number of collecting devices is the same as the number of the receiving interfaces.