WO2022089129A1

WO2022089129A1 - Lng ship and membrane type enclosure system thereof

Info

Publication number: WO2022089129A1
Application number: PCT/CN2021/121200
Authority: WO
Inventors: 徐岸南; 金燕子; 宋炜; 吴涛; 宋忠兵; 刘恒; 刘涛
Original assignee: 沪东中华造船(集团)有限公司
Priority date: 2020-10-30
Filing date: 2021-09-28
Publication date: 2022-05-05
Also published as: CN112498582B; CN112498582A

Abstract

An LNG ship and a membrane type enclosure system thereof, comprising a first seal shielding layer (1), a second seal shielding layer (4) provided outside the first seal shielding layer (1) and connected to the first seal shielding layer (1) by means of several pieces of supporting wood (2), and an insulation structure (12) provided outside the second seal shielding layer (4) and respectively fixed to the second seal shielding layer (4) and a ship body structure (8); a gap between the first seal shielding layer (1) and the second seal shielding layer (4) forms a primary shielding space (13), a pore inside the insulation structure (12) and a slot between the insulation structure (12) and the second seal shielding layer (4) form a secondary shielding space, and both the primary shielding space (13) and the secondary shielding space are filled with a protective gas and are installed with a sensor to detect whether there is natural gas leakage. According to the system, a double-channel sealed ultralow-temperature LNG storage carrier is built, and the problems of LNG storage and leakage prevention are solved.

Description

An LNG ship and its membrane type containment system

technical field

The invention relates to the technical field of ship construction, in particular to an LNG ship and a membrane type containment system thereof.

Background technique

As a kind of green, clean and high calorific value energy, the demand for liquefied natural gas in my country is growing rapidly, and the gap between supply and demand is expanding rapidly. Therefore, by importing natural gas resources from overseas, adjusting the energy structure, making up for energy shortages, and meeting the demand for emerging energy from the ever-accelerating national economic development have become an important decision for my country to implement its energy strategy. However, LNG is stored and transported at ultra-low temperature and minus 163°C. Therefore, the type of cargo tank enclosure that is in direct contact with LNG is very important.

At present, the liquid cargo containment systems of large LNG ships used in real ships include spherical tank type (MOSS), membrane type (Membrane) and SPB type. The spherical tank type cargo tank is developed by the Norwegian company Rosenberg. The shape of the cargo tank storage tank is spherical, and the cargo tank has no loading liquid level limit. The tank material is aluminum alloy A5083, and the periphery is covered with polyurethane insulating material, which is expensive and heavy. The film type cargo tank was developed by the French GTT company. There are NO.96 type, Mark III type and CS1 type. These three types all use 0.7 mm thick metal film as the lining of the cargo tank, and are equipped with insulating materials and secondary isolation layers. After each layer is fixed to each other, it is closely connected with the hull, but the metal film has a limited capacity to bear the sloshing load of liquid cargo, and the structure of the cargo tank is complex and the construction period is very long. The SPB type cargo hold is a form of cargo hold developed by Japan's Ishikawajima-Harima Heavy Industries (IHI). It is a rib structure constructed of 9-nickel steel. The cargo hold has a complex structure and a high cost. In addition, South Korea has also developed the KC-1 thin-film liquid cargo containment system. Both the primary and secondary layers are made of 1.5 mm thick metal materials, but the two layers are the same, with complex structures and difficult prefabrication.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an LNG ship and a film type containment system thereof. By arranging a support wood between the first sealing and shielding layer and the second sealing and shielding layer, the first sealing and shielding layer and the second sealing and shielding are used. The main shielding space formed between the layers, the pores inside the insulating structure and the secondary shielding space formed by the gap between the insulating structure and the second sealing shielding layer effectively build a double-sealed ultra-low temperature LNG storage carrier.

A membrane type containment system for an LNG ship, comprising:

The first sealing shield layer in direct contact with LNG;

a second sealing and shielding layer arranged outside the first sealing and shielding layer and connected with the first sealing and shielding layer through several supporting woods;

and an insulating structure arranged outside the second sealing and shielding layer and respectively fixed with the second sealing and shielding layer and the hull structure;

The gap between the first sealing and shielding layer and the second sealing and shielding layer forms a main shielding space, the pores inside the insulating structure and the gap between the insulating structure and the second sealing and shielding layer form a secondary shielding space, and the main shielding space Both the shielding space and the secondary shielding space are filled with protective gas and installed with sensors to detect whether there is natural gas leakage.

Preferably, the insulating structure includes several insulating layers arranged at equal distances and glass wool filled in the gaps between adjacent insulating layers.

Preferably, the insulating layer is composed of a first plywood, an insulating material and a second plywood which are arranged in sequence from the inside to the outside, the first plywood is provided with a groove, and the groove is provided with a tongue member, the card One end of the tongue piece is stuck in the groove, and the other end is stuck in the supporting wood after passing through the second sealing shielding layer;

The second plywood is bonded to the hull structure by epoxy resin.

Preferably, the tongue piece is an L-shaped invar strip, the horizontal section of the tongue piece is clamped in the groove, the vertical section is welded and fixed with the second sealing and shielding layer, and its end is clamped in the support wood;

The groove is a T-shaped groove.

Preferably, the insulating material is polyurethane foam.

Preferably, anchors are fixed on the inner end face of the support wood, and a slot for clamping the tongue member is defined on the outer end face, and the anchors are welded and fixed with the first sealing and shielding layer.

Preferably, the anchor is a plate-like structure with a plurality of threaded holes, and the anchor is fixed on the inner end surface of the supporting wood by means of bolts.

Preferably, the second sealing and shielding layer and the supporting wood are fixed by an adhesive.

Preferably, the first sealing and shielding layer is a corrugated stainless steel plate;

The second sealing and shielding layer is an invar plate.

An LNG ship includes the LNG ship membrane type containment system.

The beneficial effects of the present invention are:

1. In the film type enclosure system of the present invention, a support wood is arranged between the first sealing shielding layer and the second sealing shielding layer, and the first insulation formed by the gap between the first sealing shielding layer and the second sealing shielding layer is utilized. The space, the pores inside the insulating structure and the second insulating space formed by the gap between the insulating structure and the second sealing shielding layer effectively build a double-sealed ultra-low temperature LNG storage carrier, which solves the problems of LNG storage and leakage prevention.

2. A plurality of equally spaced supporting woods are arranged between the first sealing shield and the second sealing shield, which can support the first sealing shield. At the same time, anchors are preset on the supporting wood to connect the first sealing In addition, the support wood is also slotted, which can accommodate the tab pieces of the insulating structure, and can locate the insulating structure to prevent the insulating structure from moving and ensure the integrity of the enclosure system.

3. By filling glass wool between adjacent insulating layers, under the action of the elastic deformation of glass wool, the insulating layer can be moved within a certain range to absorb the energy of thermal expansion and contraction of the enclosure system, which greatly improves the The overall performance of the containment system can ensure the safety and reliability of the containment system.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of the film-type enclosure system of the present invention.

Figure 2 is a cross-sectional view of the film-type containment system of the present invention.

Figure 3 is a schematic diagram of the structure of the anchor.

FIG. 4 is a schematic diagram of the connection between the tongue piece and the insulating structure.

The meanings of the symbols in the figure are:

1 is the first sealing and shielding layer, 2 is the supporting wood, 3 is the tab piece, 4 is the second sealing and shielding layer, 5 is the first plywood, 6 is the insulating material, 7 is the second plywood, 8 is the hull structure, 9 It is epoxy resin, 10 is glass wool, 11 is an anchor, 12 is an insulating structure, 13 is a main shielding space, 14 is an insulating layer, and 15 is a groove.

Detailed ways

In order to better understand the technical solutions of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present application will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and should not be construed as indicating or implying relative importance; unless otherwise specified or explained , the term "multiple" refers to two or more; the terms "connection" and "fixed" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral Connection; either directly or indirectly through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The present invention provides an LNG ship and a film-type containment system thereof. The film-type containment system uses the first sealing and shielding layer by arranging a support wood 2 between the first sealing and shielding layer 1 and the second sealing and shielding layer 4. The first insulating space formed by the gap between 1 and the second sealing and shielding layer 4, the pores inside the insulating structure and the second insulating space formed by the gap between the insulating structure and the second sealing and shielding layer 4 effectively build a double The sealed ultra-low temperature LNG storage carrier solves the problems of LNG storage and leakage prevention.

The film-type enclosure system in this embodiment is specifically an A-type enclosure system.

The film type enclosure system of the present invention includes a first sealing and shielding layer 1 , a supporting wood 2 , a second sealing and shielding layer 4 and an insulating structure 12 .

The first sealing and shielding layer 1 is in direct contact with the liquefied natural gas, and is arranged on the innermost layer of the film-type containment system.

The second sealing and shielding layer 4 is disposed outside the first sealing and shielding layer 1 .

The second sealing and shielding layer 4 is connected to the first sealing and shielding layer 1 through a plurality of supporting woods 2, and the plurality of supporting woods 2 are equally spaced. Specifically, the supporting wood 2 is used to support the first sealing and shielding layer 1 , the inner end surface of the supporting wood 2 is fixed with an anchor 11 , and the outer end surface is provided with a clamping groove. The anchor 11 is used to fix the first sealing and shielding layer 1, that is, the first sealing and shielding layer 1 and the anchor 11 on the support wood 2 are welded and fixed. In this embodiment, the anchor 11 is a plate-shaped with a plurality of threaded holes. Structure, the anchor 11 is fixed on the inner end surface of the supporting wood 2 by means of bolts. The slot is used for positioning the insulating structure 12 to prevent movement of the insulating structure 12 and ensure the integrity of the enclosure system. The second sealing and shielding layer 4 is welded on the tab 3 of the insulating structure.

The gap between the first sealing and shielding layer 1 and the second sealing and shielding layer 4 forms a main shielding space 13. The main shielding space 13 is filled with protective gas and installed with a dangerous gas sensor to detect whether there is natural gas leakage. The gas filled in the space 13 can be selected from nitrogen. When the first sealing and shielding layer 1 leaks, the second sealing and shielding layer 4 can receive the leaked cryogenic liquid, so as to avoid brittle cracking of the hull steel plate due to the contact of the hull structure with the cryogenic liquid, thus ensuring the safety of the ship.

The insulating structure 12 is disposed outside the second sealing and shielding layer 4 and is respectively fixed with the second sealing and shielding layer 4 and the hull structure 8 .

The pores inside the insulating structure 12 and the gap between the insulating structure 12 and the second sealing and shielding layer 4 form a secondary shielding space, and the secondary shielding space is filled with protective gas and installed with sensors to detect whether there is natural gas leakage. The gas filled in the space can be selected from nitrogen.

The insulating structure 12 is fixed on the hull structure 8 by the epoxy resin 9, and the insulating structure 12 can prevent the conduction of most of the cold energy, ensuring that the temperature transmitted to the hull steel plate is within the working range of the hull steel plate, and further ensuring the safety of the enclosure system. Safety, further reducing the possibility of embrittlement of the hull steel plate.

Specifically, the insulating structure 12 includes a plurality of insulating layers 14 arranged at equal intervals and glass wool 10 filled in the spaces between adjacent insulating layers 14 . Due to the elasticity of the glass wool 10, when the enclosure system expands and contracts with heat, the insulating layer 14 can be moved within a certain range under the action of the elastic deformation of the glass wool 10 to absorb the energy of thermal expansion and contraction of the enclosure system. , greatly improving the overall performance of the containment system, so as to ensure the safety and reliability of the containment system.

The insulating layer 14 is composed of a first plywood 5 , an insulating material 6 and a second plywood 7 arranged in sequence from the inside to the outside. The first plywood 5 and the second plywood 7 are respectively bonded to the inner and outer end surfaces of the insulating material 6 , and the second plywood 7 is bonded to the hull structure 8 through epoxy resin 9 .

The insulating material 6 is polyurethane foam. The pores existing in the insulating material 6 itself, the pores existing in the glass wool 10 itself, and the gap between the entire insulating structure and the second sealing shielding layer 4 together constitute the secondary shielding space.

The first plywood 5 is provided with a groove 15, and the groove 15 is provided with a tab member 3. One end of the tab member 3 is stuck in the groove 15, and the other end passes through the second sealing shielding layer 4 and then is stuck in the groove. In the card slot of the support wood 2. In this embodiment, the groove 15 is a T-shaped groove, and the tab member 3 is an L-shaped invar strip. The horizontal section of the tab member 3 is clamped in the groove 15, and the vertical section passes through the second sealing and shielding layer 4 and is It is welded and fixed with the second sealing and shielding layer 4 , and the end of the vertical section is clamped in the clamping groove of the supporting wood 2 .

In order to ensure the stability of the connection between the second sealing and shielding layer 4 and the supporting wood 2 , the second sealing and shielding layer 4 and the supporting wood 2 may also be fixed by an adhesive.

Since liquid LNG is an ultra-low temperature liquid of -163°C, the material of the first sealing and shielding layer that is in direct contact with the LNG liquid is required to meet the requirements of low temperature plasticity, and can overcome the expansion and contraction problem from normal temperature to low temperature. The choice of the cargo tank structure type and the required evaporation rate should be considered. Therefore, in this embodiment, the first sealing and shielding layer 1 is made of stainless steel 304L, and is prefabricated into a corrugated shape, which strengthens the first sealing and shielding layer. 1 expansion and contraction capacity. The second sealing and shielding layer 4 is made of invar steel, which is not sensitive to changes in cold and heat, and is very suitable for use in low temperature liquids.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims

A membrane type containment system for an LNG ship, characterized in that it includes:

The first sealing shield layer in direct contact with LNG;

a second sealing and shielding layer arranged outside the first sealing and shielding layer and connected with the first sealing and shielding layer through several supporting woods;

and an insulating structure arranged on the outside of the second sealing shielding layer and fixed with the second sealing shielding layer and the hull structure respectively, the insulating structure includes a plurality of insulating layers arranged at equal distances and the gaps filled between the adjacent insulating layers glass wool inside;

The insulating layer is composed of a first plywood, an insulating material and a second plywood that are arranged in sequence from the inside to the outside. The first plywood is provided with a groove, and the groove is provided with a tongue piece, and the tongue piece has a groove. One end is stuck in the groove, and the other end is stuck in the supporting wood after passing through the second sealing shielding layer;

the second plywood is bonded to the hull structure by epoxy resin;

An anchor is fixed on the inner end surface of the supporting wood, and a slot for clamping the tongue is provided on the outer end surface, and the anchor is welded and fixed with the first sealing shielding layer;

The anchor is a plate-like structure with a plurality of threaded holes, and the anchor is fixed on the inner end face of the supporting wood by bolts;

The gap between the first sealing and shielding layer and the second sealing and shielding layer forms a main shielding space, the pores inside the insulating structure and the gap between the insulating structure and the second sealing and shielding layer form a secondary shielding space, and the main shielding space Both the shielding space and the secondary shielding space are filled with protective gas and installed with sensors to detect whether there is natural gas leakage.
The membrane type containment system for an LNG ship according to claim 1, wherein the tongue member is an L-shaped invar strip, the horizontal section of the tongue member is stuck in the groove, and the vertical section is sealed with the second seal The shielding layer is welded and fixed and its end is stuck in the supporting wood;

The groove is a T-shaped groove.
The membrane type containment system for an LNG ship according to claim 1, wherein the insulating material is polyurethane foam.
The film type containment system for an LNG ship according to claim 1, wherein the second sealing and shielding layer and the supporting wood are fixed by an adhesive.
The film type containment system for an LNG ship according to claim 1, wherein the first sealing and shielding layer is a corrugated stainless steel plate;

The second sealing and shielding layer is an invar plate.
An LNG ship is characterized by comprising the LNG ship membrane type containment system according to any one of claims 1-5.