KR20210034741A - Cargo tank - Google Patents

Abstract

A cargo tank is disclosed. According to one embodiment of the present invention, the cargo tank comprises: a cargo tank main body in which liquefied natural gas (LNG) is stored; and a vacuum type insulation panel insulated and installed in at least a partial section of the wall forming the cargo tank main body and suppressing heat transmission between the inside and the outside of the cargo tank main body based on a vacuum method.

Description

Cargo hold {CARGO TANK}

The present invention relates to a cargo hold, and more particularly, to a cargo hold capable of maximizing a heat shielding effect through a vacuum wall structure different from the conventional one.

The cargo tank, which is applied to a carrier that carries gases such as liquefied natural gas (LNG), is insulated on the wall to store LNG in cryogenic (atmospheric pressure ??162 degrees) condition. It is installed by adding panels.

For example, the wall of the cargo hold is insulated by attaching a panel having an insulating function, such as polyurethane, to a wall frame made of aluminum alloy. For reference, there are various types of cargo holds depending on the shape and structure, the type of insulation panel and the construction method, but the specific structure is omitted.

As described above, in order to safely store LNG in cryogenic conditions without evaporation, the walls of the cargo hold are insulated, but the heat transfer due to the difference between the external temperature and the LNG temperature in the cargo hold cannot be prevented by 100% with the existing heat insulation structure.

Therefore, as relatively high external heat is transferred into the cargo hold, the LNG temperature in the cargo hold increases. In this process, some of the LNG vaporizes and changes to gas. The gas generated by vaporizing in this way is called BOG (Boil Off Gas).

The more BOG is generated, the more LNG that is thrown away, which inevitably decreases the amount of LNG that can be transported by the ship.

Therefore, when manufacturing a cargo hold, it can be seen that the insulation performance of the cargo hold together with the degree of occurrence of BOG becomes the most important measure. Accordingly, as high external heat is transferred into the cargo hold, research and development on the so-called cargo hold that can increase the heat shielding effect, which can reduce the situation of vaporizing LNG in the cargo hold as much as possible, is ongoing.

However, in the case of the existing cargo hold, as previously described, the thermal insulation structure of the cargo hold wall is only about the method of constructing a panel having an insulating function such as polyurethane on a wall frame made of aluminum alloy, so the heat shielding effect against cost is not so good. Considering that it is not excellent, it is necessary to develop a technology for a new concept of cargo hold that is not known before.

Korean Intellectual Property Office Application No. 10-2011-0101004 Korean Intellectual Property Office Application No. 10-2012-0050928

Therefore, the technical problem to be achieved by the present invention is to provide a cargo hold capable of maximizing a heat shielding effect through a vacuum wall structure different from the prior art, and thereby significantly lowering the amount of BOG generation.

According to an aspect of the present invention, a cargo hold body in which liquefied natural gas (LNG) is stored therein; And a vacuum-type thermal insulation panel that is insulated in at least some section of the wall forming the cargo hold body and blocks heat transfer between the inside and outside of the cargo hold body based on a vacuum method.It may be provided.

The vacuum-type thermal insulation panel may include a vacuum honeycomb member for reinforcing rigidity to a wall of the cargo hold body while allowing a plurality of vacuum chambers to be formed therein; A first vacuum side plywood (Plywood) having one side supported by the wall of the cargo hold body and the other side disposed on the vacuum honeycomb member; A second vacuum-side plywood disposed opposite the first vacuum-side plywood so that the vacuum honeycomb member is disposed therebetween and supporting the vacuum honeycomb member together with the first vacuum-side plywood; And a vacuum-side membrane made of a thin plate made of stainless steel or nickel, and provided on an outer wall of the second vacuum-side plywood.

It is manufactured in a non-vacuum method, and may further include a non-vacuum type insulation panel installed on the wall of the cargo hold body together with the vacuum type insulation panel to prevent heat transfer between the inside and outside of the cargo hold body, and the non-vacuum type insulation panel, Insulation plate applied with a relatively low heat transfer coefficient perlite (Perlite) or glass wool (Glass Wool); A first non-vacuum side plywood (Plywood) having one side supported by the wall of the cargo hold body and the other side disposed on the heat insulating plate; A second non-vacuum side plywood disposed opposite the first non-vacuum side plywood so that the heat insulation board is disposed therebetween and supporting the heat insulation plate together with the first non-vacuum side plywood; And a non-vacuum side membrane which is made of a thin plate made of stainless steel or nickel and is provided on an outer wall of the second non-vacuum side plywood.

The vacuum-type insulation panel may be concentrated and constructed on the upper wall where BOG (Boil Off Gas) is relatively more generated in the wall constituting the cargo hold body, and the non-vacuum insulation panel may be installed on the remaining walls.

After the vacuum-type insulation panel is firstly installed on the wall of the cargo hold body, the non-vacuum-type insulation panel may be secondly overlapped on the vacuum-type insulation panel to be constructed.

According to the present invention, it is possible to maximize the heat shielding effect through a vacuum wall structure different from that of the prior art, and thereby, the amount of BOG generated can be significantly lower than that of the prior art.

1 is a structural diagram of a liquefied natural gas (LNG) carrier with a cargo hold according to an embodiment of the present invention.
2 is a schematic cross-sectional structural diagram of a cargo hold applied to FIG. 1.
3 is a perspective view of a vacuum insulation panel of a cargo hold.
4 is a partially cut-away perspective view of FIG. 3.
5 is a cross-sectional structural diagram of a non-vacuum insulation panel of a cargo hold.
6 and 7 are a modified embodiment of a cargo hold.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the implementation of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing a preferred embodiment of the present invention with reference to the accompanying drawings. The same reference numerals shown in each drawing indicate the same members.

1 is a structural diagram of a liquefied natural gas (LNG) carrier with a cargo hold according to an embodiment of the present invention.

For reference, the cargo hold 110 of this embodiment includes a gas carrier (100, carrier) for transporting gas such as liquefied natural gas (LNG) shown in FIG. 1, LNG FPSO (Floating, Production, Storage and Offloading) or floating offshore structures such as LNG FSRU (Floating Storage and Regasification Unit), and an LNG regasification vessel that regasifies the stored LNG and unloads it in natural gas after it arrives at the required land by sailing the sea with LNG ( It can be applied to LNG RV, LNG Regasification Vessel), etc. However, in the following, for convenience of explanation, the LNG carrier 100 of FIG. 1 will be described as an example.

Referring to Figure 1, the LNG carrier 100 includes a hull 101. One side of the hull 101 is provided with a dwelling unit 102 where sailors reside.

A propulsion propeller 103 is provided at the rear of the hull 101 to generate a propulsion force of the LNG carrier 100. The propulsion propeller 103 is connected to a power system (not shown) in the hull 101, and generates a propulsion force of the LNG carrier 100 by a rotational motion.

A rudder 104 (Rudder) for adjusting the navigation direction of the LNG carrier 100 is disposed around the propeller propeller 103. The rudder 104 may be deformed into other shapes and structures other than those shown.

Meanwhile, a cargo hold 120 is provided in the hull 101. The cargo hold 120 is provided in most spaces within the hull 101 except for the power system. Liquefied natural gas (LNG, liquefied natural gas) may be stored and stored in the cargo hold 120.

Between the cargo hold 120, a cofferdam 106 is disposed. The cofferdam 106 partitions the cargo holds 120. The cofferdam 106 has a device for heating air therein to protect the wall of the hull 101 from cold air transmitted from the cargo hold 120 storing cryogenic LNG.

2 is a schematic cross-sectional structural view of a cargo hold applied to FIG. 1, FIG. 3 is a perspective view of a vacuum insulation panel of a cargo hold, FIG. 4 is a partially cut-away perspective view of FIG. 3, and FIG. 5 is a non-vacuum insulation panel of the cargo hold. It is a cross-sectional structure diagram for

Referring to these drawings, the cargo hold 120 of the present embodiment is a kind of tank for storing and storing LNG, and it is possible to maximize the heat shielding effect through a vacuum wall structure different from the conventional one.

In other words, in the cargo hold 120 of this embodiment, a vacuum (Vacuum) wall structure as a means to prevent the phenomenon of vaporizing LNG as much as possible by transferring heat from the outside of the cargo hold 120, which is relatively high temperature, into the cargo hold 120 Is applied. In this case, the amount of BOG (Boil Off Gas) generated as LNG is vaporized by heat transferred from the outside can be significantly reduced.

The cargo hold 120 according to the present embodiment capable of providing such an effect may include a cargo hold body 111, a vacuum type insulation panel 120, and a non-vacuum type insulation panel 130. For reference, in the drawings, the vacuum-type insulation panel 120 and the non-vacuum insulation panel 130 are shown as being each one body, but this is only shown for convenience, and the vacuum-type insulation panel 120 and the non-vacuum insulation panel 130 ) May be a multi-piece assembly structure in unit size. Therefore, the scope of the present invention is not limited to the shape of the drawings.

The cargo hold body 111 forms the skeleton of the cargo hold 120 according to this embodiment. LNG is stored and stored in the space 112 in the cargo hold body 111. The cargo hold body 111 is excellent in strength and strong in corrosion resistance, and may be made of a light metal or a composite metal.

The vacuum insulation panel 120 is insulated in at least some section of the wall forming the cargo hold body 111, but serves to prevent heat transfer between the inside and outside of the cargo hold body 111 based on a vacuum method. .

In particular, in this embodiment, the vacuum-type insulation panel 120 is locally installed only in at least some section of the wall forming the cargo hold body 111. This will be described later.

The vacuum insulation panel 120 may include a vacuum honeycomb member 121, a first vacuum-side plywood 122 (Plywood), a second vacuum-side plywood 123, and a vacuum-side membrane 124.

The vacuum honeycomb member 121 is a structure in which a plurality of vacuum chambers 121a are formed.

In particular, in this embodiment, the vacuum honeycomb member 121 allows the heat shielding effect through vacuum to be maximized, while also reinforcing the rigidity of the cargo hold body 111 against the wall due to its structural characteristics. do.

More specifically, by making the vacuum-type insulation panel 120, that is, the vacuum cell constituting the vacuum room 121a, into a honeycomb-shaped structure, while properly supporting the vertical load applied to the vacuum-type insulation panel 120, It makes it possible to flexibly respond to the transformation to the lateral transformation.

Therefore, while being able to effectively support the LNG's own weight in the cargo hold 120 or the load due to sloshing, it is possible to shrink/expand according to the LNG temperature change, and even in the deformation situation of the hull 101 (see FIG. 1) occurring during operation. It can provide several advantages that can maintain the airtightness in the cargo hold 120.

The first vacuum side plywood 122 is a structure having one side supported by the wall of the cargo hold body 111 and the other side disposed on the vacuum honeycomb member 121.

In addition, the second vacuum-side plywood 123 is disposed on the opposite side of the first vacuum-side plywood 122 so that the vacuum honeycomb member 121 is disposed therebetween, and the vacuum honeycomb member together with the first vacuum-side plywood 122 It is a structure that supports 121.

These first and second vacuum-side plywoods 122 and 123 are a generic term for attaching a thin plate of wood with an adhesive so that the directions of the wood grain are perpendicular to each other, and other materials other than simple wood may be included.

The vacuum side membrane 124 is made of a thin plate made of stainless steel or nickel, and is a portion provided on the outer wall of the second vacuum side plywood 123. The vacuum side membrane 124 is a portion substantially in contact with the LNG. Therefore, the vacuum side membrane 124 is applied as a stainless steel or nickel material so as not to be corroded.

The non-vacuum insulation panel 130 is manufactured in a non-vacuum manner, but is installed on the wall of the cargo hold body 111 together with the vacuum insulation panel 120 to prevent heat transfer between the inside and outside of the cargo hold body 111.

The non-vacuum type insulation panel 130 may include an insulation plate 131, a first non-vacuum side plywood 132, a second non-vacuum side plywood 133, and a non-vacuum side membrane 134.

The insulation plate 131 provides a practical insulation function. In this embodiment, the heat insulating plate 131 may be made of pearlite or glass wool having a relatively low heat transfer coefficient.

The first non-vacuum side plywood 132 is a structure in which one side is supported by the wall of the cargo hold body 111 and the other side is disposed on the heat insulating plate 131.

And, the second non-vacuum side plywood 133 is disposed on the opposite side of the first non-vacuum side plywood 132 so that the heat insulation plate 131 is disposed therebetween, and the heat insulation plate 131 together with the first non-vacuum side plywood 132 It is a structure that supports.

The non-vacuum side membrane 134 functions like the previous vacuum side membrane 124. That is, the non-vacuum side membrane 134 is made of a thin plate made of stainless steel or nickel, and is a plate provided on the outer wall of the second non-vacuum side plywood 133.

Since the non-vacuum side membrane 134 is in contact with LNG, it is applied with stainless steel or nickel to prevent corrosion.

On the other hand, in applying the above-described vacuum insulation panel 120 and non-vacuum insulation panel 130 to the wall constituting the cargo hold body 111, in the present embodiment, in the entire wall constituting the cargo hold body 111 as shown in FIG. The portion where BOG is relatively more generated, that is, the vacuum-type insulation panel 120 is concentrated and constructed on the upper wall, and the non-vacuum-type insulation panel 130 is constructed on the remaining wall.

In this case, it is possible to reduce the BOG by providing a substantially equivalent heat shielding effect, while reducing the vacuum-type insulation panel 120, which is relatively expensive to manufacture, thereby reducing the increase in the construction cost of the LNG vessel (100, see FIG. 1). I can.

In addition, there is an advantage in that there is no fear of damage to the vacuum cell constituting the vacuum honeycomb member 121 even in the event of a collision of the vessel 100, thereby reducing the possibility of LNG leakage.

According to the present embodiment, which functions as a structure as described above, it is possible to maximize a heat shielding effect through a vacuum wall structure different from the conventional one, and thus, the amount of BOG generation can be significantly lowered than in the prior art.

6 and 7 are a modified embodiment of a cargo hold.

The cargo holds 210 and 310 shown in these drawings are also equipped with a vacuum-type insulation panel 120 and a non-vacuum insulation panel 130 on the wall of the cargo hold body 111 to maximize the heat shielding effect for the cargo holds 210 and 310. To be there.

However, the location where the vacuum-type insulation panel 120 and the non-vacuum insulation panel 130 are installed differs from the above-described embodiment.

In the case of the cargo hold 210 shown in FIG. 6, after the vacuum type insulation panel 120 is firstly constructed on the wall of the cargo hold body 111, the non-vacuum type insulation panel 130 on the vacuum type insulation panel 120 It has a structure that is constructed by overlapping this second order.

In addition, in the case of the cargo hold 310 shown in FIG. 7, a plurality of vacuum insulation panels 120 and non-vacuum insulation panels 130 are alternately arranged with each other to form an insulation structure.

Although the modified embodiment of FIGS. 6 and 7 may be slightly higher in terms of manufacturing cost than the embodiment of FIG. 2, it is more advantageous in maximizing the heat shielding effect for the cargo holds 210 and 310.

Even if the present embodiment is applied, it is possible to maximize the heat shielding effect through a vacuum wall structure different from the conventional one, and thus, the amount of BOG generation can be significantly lower than the conventional one.

As described above, the present invention is not limited to the described embodiments, and it is apparent to those of ordinary skill in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such modifications or variations belong to the claims of the present invention.

100: ship 101: hull
110: cargo hold 111: cargo hold body
112: space 120: vacuum insulation panel
121: vacuum honeycomb member 121a: vacuum room
122: 1st vacuum side plywood 123: 2nd vacuum side plywood
124: vacuum side membrane 130: non-vacuum type insulation panel
131: heat insulation plate 132: first non-vacuum side plywood
133: second non-vacuum side plywood 134: non-vacuum side membrane

Claims (5)

A cargo hold body in which liquefied natural gas (LNG) is stored therein; And
A cargo hold comprising a vacuum insulation panel that is insulated in at least some section of the wall forming the cargo hold body and blocks heat transfer between the inside and outside of the cargo hold body based on a vacuum method. The method of claim 1,
The vacuum insulation panel,
A vacuum honeycomb member for reinforcing stiffness against the wall of the cargo hold body and allowing a plurality of vacuum chambers to be formed therein;
A first vacuum side plywood (Plywood) having one side supported by the wall of the cargo hold body and the other side disposed on the vacuum honeycomb member;
A second vacuum-side plywood disposed opposite the first vacuum-side plywood so that the vacuum honeycomb member is disposed therebetween and supporting the vacuum honeycomb member together with the first vacuum-side plywood; And
A cargo hold made of a thin plate made of stainless steel or nickel, and including a vacuum-side membrane provided on the outer wall of the second vacuum-side plywood. The method of claim 1,
It is manufactured in a non-vacuum method and is installed on the wall of the cargo hold body together with the vacuum type insulation panel, and further comprises a non-vacuum type insulation panel to prevent heat transfer between the inside and outside of the cargo hold body,
The non-vacuum type insulation panel,
Insulation plate applied with a relatively low heat transfer coefficient perlite (Perlite) or glass wool (Glass Wool);
A first non-vacuum side plywood (Plywood) having one side supported by the wall of the cargo hold body and the other side disposed on the heat insulating plate;
A second non-vacuum side plywood disposed opposite the first non-vacuum side plywood so that the heat insulation board is disposed therebetween and supporting the heat insulation plate together with the first non-vacuum side plywood; And
A cargo hold made of a thin plate made of stainless steel or nickel, and including a non-vacuum side membrane provided on the outer wall of the second non-vacuum side plywood. The method of claim 3,
A cargo hold in which the vacuum-type insulation panel is concentrated and constructed on an upper wall where BOG (Boil Off Gas) is relatively more generated in the wall constituting the cargo hold body, and the non-vacuum insulation panel is constructed on the remaining wall. The method of claim 3,
After the vacuum-type insulation panel is firstly constructed on the wall of the cargo hold body, the non-vacuum-type insulation panel is secondly overlapped on the vacuum-type insulation panel to be constructed.

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