KR20130128232A - Insulation panel for cryogenic liquid cargocontainment - Google Patents

Abstract

An insulation material for a cryogenic liquid cargo hold is disclosed. The insulation material for a cryogenic liquid cargo hold of the present invention comprises: foam; and multiple glass bubbles which are mixed with the foam and solidified to form a complex body. The insulation material for a cryogenic liquid cargo hold according to an embodiment of the present invention improves the insulation performance and strength of a cryogenic liquid cargo hold by mixing polyurethane foam with the glass bubbles.

Description

INSULATION PANEL FOR CRYOGENIC LIQUID CARGOCONTAINMENT}

The present invention relates to a low temperature liquid cargo hold heat insulating material, and more particularly, to a low temperature liquid cargo hold heat insulating material provided in a cargo hold in which a low temperature liquid containing liquefied natural gas is stored to insulate the low temperature liquid.

Natural gas is transported in a gaseous state through land or sea gas pipelines, or is transported to a remote location where it is stored in an LNG carrier in the form of liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

LNG transports for loading LNG on land with the LNG loaded on land, or LNG RV (Regasification for loading LNG on natural gas) Vessel includes a cryogenic storage tank (often referred to as a 'hold') of liquefied natural gas.

In recent years, demand for floating floating structures such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (Floating Storage and Regasification Unit) has been increasing steadily. LNG transport or LNG RV Includes a cargo hold to be installed.

The LNG FPSO is a floating offshore structure used to liquefy the produced natural gas directly from the sea and store it in the hold and, if necessary, to transport the LNG stored in the hold to the LNG Carrier. In addition, LNG FSRU is a floating offshore structure that stores LNG unloaded from LNG carriers in cargo holds at sea far from the land, and then vaporizes LNG as needed to supply land demand.

LNG carriers such as LNG carriers, LNG RVs, LNG FPSOs, and LNG FSRUs, which transport or store liquids such as LNG, are equipped with cargo holds to store LNG in cryogenic conditions.

The cargo hold can be classified into independent tank type and membrane type depending on whether the load directly affects the insulation. Membrane hold is usually divided into GTT NO 96 type, TGZ Mark III type and CS1 type, and independent tank type hold is divided into MOSS type and IHI-SPB type.

The GTT type and TGZ type cargo hold structures described above are disclosed in U.S. Patent Nos. 6,035,795, 6,378,722, 5,586,513, and U.S. Patent Publication No. 2003-0000949, Korean Patent Laid-open Nos. 10-2000-0011347 and 10-2000- 0011346 and the like. In addition, the CS1 type has a problem in that leakage occurs in the performance line due to a poor quality in the manufacturing process or a method made by collecting only the advantages of the NO 96 and Mark III type.

On the other hand, the cargo hold of the type described above is provided with a heat insulating material to insulate the low-temperature liquid to be stored. In particular, in the case of Mark III type or CS1 type, a closed cell type reinforced polyurethane foam is used as a heat insulating material. This reinforced polyurethane foam is a foam that has a high strength by adding a glass mat to the inside of the polyurethane foam in order to compensate for the disadvantages of the conventional polyurethane foam, that is, having a low compressive strength compared to good thermal conductivity. .

However, when the glass mat is added to increase the strength, the porosity decreases and the heat insulation effect decreases, thereby increasing the strength of the reinforced polyurethane foam.

Therefore, the development of a new and advanced type of insulation that can maintain the insulation performance while increasing the strength is required.

Korean Patent Registration Publication No. 10-0710981 (Hyundai Heavy Industries Co., Ltd.) 2007. 04. 17.

Therefore, the technical problem to be achieved by the present invention is to provide a low-temperature liquid cargo hold insulation that can increase the strength while maintaining the conventional thermal insulation performance, while ensuring the price competitiveness.

According to an aspect of the invention, the heat insulating material used for the cargo hold in which the low temperature liquid is stored, the foam (foam); And a plurality of glass bubbles mixed with the foam and then solidified to form a composite with the foam.

The foam may comprise a polyurethane foam or a PVC foam.

The glass bubble may be 3 to 15% by weight, and the polyurethane foam may be 85 to 95% by weight.

It may further include a finish provided on at least one of the upper side and the lower side of the foam.

The low temperature liquid may include liquefied natural gas (LNG), and the low temperature liquid cargo hold may include any one of NO 96 type, Mark III type, or CS1 type.

According to another embodiment of the present invention, in the low temperature liquid cargo hold in which the low temperature liquid is stored, a low temperature liquid cargo hold including the above-described heat insulating material may be provided.

Embodiments of the present invention, by mixing the glass bubble in the polyurethane foam to satisfy the excellent thermal insulation effect of the polyurethane foam and the excellent compressive strength of the glass bubble at the same time can improve the thermal insulation performance and strength of the cold liquid cargo hold.

1 is a view schematically showing a heat insulating material for a cold liquid cargo hold according to an embodiment of the present invention.
FIG. 2 is a graph showing thermal conductivity according to the vacuum pressure of the glass bubble and other particle type heat insulating materials used in the present embodiment.
FIG. 3 is a view schematically illustrating a low temperature liquid cargo hold to which the insulation for the low temperature liquid cargo hold shown in FIG. 1 is applied.
4 is an enlarged view of the "A" area in Fig.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a view schematically showing a heat insulating material for a cold liquid cargo hold according to an embodiment of the present invention, Figure 2 is a graph showing the thermal conductivity according to the vacuum pressure of the glass bubble and other particulate insulating material used in this embodiment to be.

As shown in these figures, the low-temperature liquid cargo hold insulation 1 according to the present embodiment is a plurality of foams (10), and mixed with the foam (10) and then solidified to form a composite with the foam (10) Glass bubble 20 and a finish 30 provided on at least one of the upper side and the lower side of the foam 10.

The foam 10 is provided with a plurality of voids therein and has a predetermined volume after solidifying. In this embodiment, the foam 10 includes a polyurethane foam and a PVC foam. And the glass bubble 20 to be described later is filled in the plurality of pores of the foam 10 in the manufacturing process, the compressive strength of the foam 10 is increased by the glass bubble 20 filled in the plurality of pores as will be described later in detail.

In addition, in the present embodiment, the voids of the foam 10 may increase the number of voids per unit area in order to increase the compressive strength, but may reduce the size of the voids. In this case, more void walls and struts are provided in the pores of the foam 10 per unit area, so that the void structures can be more efficiently supported under the compressive load, thereby increasing the compressive strength.

As shown in FIG. 1, the glass bubble 20 is filled in the voids of the foam 10 to increase the compressive strength of the foam 10 and maintain a thermal insulation performance. The glass bubble 20 is a three-dimensional hollow structure microsphere, and is a type of filler mainly composed of soda-lime borosilicate. The size of the particle is 14 ~ 135 탆, the specific gravity is 0.125 ~ 0.6 g / cm3.

In the present embodiment, the glass bubble 20 is filled to 3 to 15% by weight, rather than being filled entirely on the foam 10, and as a result, the polyurethane foam has 85 to 95% by weight. Recent studies have shown that the weight percent and compressive strength of the glass bubble 20 filled in the polyurethane foam are not always proportional, but there is a proportion by weight which is 3 to 15 weight percent described above. to be.

In other words, if the glass bubble 20 is filled with 3% by weight, increasing the weight% of the glass bubble 20, the compressive strength is lowered, and if the glass bubble 20 is filled from 3% by weight to 7% by weight of the glass bubble The compressive strength increases proportionally with the weight percentage of (20).

Specifically, the thermal insulation performance of the polyurethane foam is affected by the cell size of the foam and the thermal conductivity of the foaming agent. In general, the faster the reaction rate with the foaming agent, the smaller the average cell size in the foam.

Therefore, the catalyst that affects the reaction rate is also an important factor. In this embodiment, by adding the glass bubble 20 to the polyurethane foam, it is possible to increase the number of inner cells and reduce the size thereof. In other words, in the present embodiment, the glass bubble 20 may be regarded as a blowing agent.

Here, the correlation between the compressive strength and the thermal insulation performance can be optimized by the addition amount of the glass bubble 20, the number of which is 7% by weight, which can be changed to correspond to the required performance as described above.

On the other hand, the glass bubble 20, as shown in Figure 2, it can be seen that the excellent thermal insulation performance has a lower thermal conductivity than pearlite or aerogel other particle powder at vacuum pressure.

In addition, pearlite or aerogels can not have the same compressive strength as the glass bubble 20, so that there is a limit to replacing the glass bubble 20.

Finishing material 30, as shown in Figure 1, is provided in the upper and lower portions of the foam 10, respectively, in the present embodiment, the finishing material 30 may be made of plywood, foam 10 The upper and lower surfaces of the may be prepared by coating with a separate coating material.

In addition, in the present embodiment, the finishing material 30 may be provided only at any one of an upper side and a lower side of the foam 10.

Hereinafter, a brief description will be given of a method of mixing the glass bubble 20 in the polyurethane foam.

In order to efficiently mix the glass bubble 20 in the polyurethane foam, it is important to distribute the glass bubble 20 having a small specific gravity as uniformly as possible when it is in a liquid state before the polyurethane foam is cured. Therefore, the catalyst or ambient conditions may be controlled to add the glass bubble 20 to the polyol or isocyanate in the liquid state so that the glass bubble 20 is evenly mixed and cured before buoyancy of the glass bubble 20.

FIG. 3 is a view schematically illustrating a low temperature liquid cargo hold to which the insulator for the low temperature liquid cargo hold shown in FIG. 1 is applied, and FIG. 4 is an enlarged view of region “A” of FIG. 3.

The heat insulating material 1 according to the present embodiment may be provided at all of the bottom portion, side wall portion, and ceiling portion of the cold liquid cargo hold 100 shown in FIG. 3, and as shown in FIG. 4, without a conventional heat insulation box. The heat insulator 1 of the present embodiment may be used as a primary heat insulation wall that primarily insulates the low temperature liquid cargo and a secondary heat insulation wall that insulates the low temperature liquid cargo secondary.

Meanwhile, in the present embodiment, the low temperature liquid includes liquefied natural gas (LNG), and the low temperature liquid cargo hold 100 includes any one of NO 96 type, Mark III type, or CS1 type.

Reference symbol M1 denotes a primary sealing wall for primarily sealing liquefied natural gas, M2 is a secondary sealing wall for sealing secondary liquefied natural gas, and H is an inner wall of the hull.

As described above, the present embodiment can improve the thermal insulation performance and strength of the low temperature liquid cargo hold by mixing the glass bubble with the polyurethane foam to satisfy the excellent thermal insulation effect of the polyurethane foam and the excellent compressive strength of the glass bubble at the same time. There is an advantage.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

1: Insulation material for low temperature liquid cargo hold 10: Foam
20: glass bubble 30: finish
100: cargo hold M1: primary sealing wall
M2: secondary sealing wall

Claims (6)

Insulation material used for cargo hold in which low temperature liquid is stored,
Foam; And
And a plurality of glass bubbles mixed with the foam and solidified to form a composite with the foam. The method according to claim 1,
The foam is a low-temperature liquid cargo hold insulation comprising a polyurethane foam or PVC foam. The method according to claim 1,
The glass bubble is 3 to 15% by weight, the foam is insulated for cold liquid cargo hold, characterized in that 85 to 95% by weight. The method according to claim 1,
Insulating material for cold liquid cargo further comprises a finish provided on at least one of the upper and lower portions of the foam. The method according to claim 1,
The low temperature liquid includes liquefied natural gas (LNG),
The low temperature liquid cargo hold is a low temperature liquid cargo hold insulation comprising any one of the type NO 96, Mark III or CS1. A low temperature liquid cargo hold in which a low temperature liquid is stored,
A low temperature liquid cargo hold comprising the heat insulating material according to any one of claims 1 to 5.

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