Thermal insulation system and construction method for type b liquid cargo tank of liquefied natural gas carrier

Abstract

A heat insulation system for a liquefied natural gas liquid cargo tank for a ship and a construction method thereof. The heat insulation system comprises: a main barrier wall (1), a heat insulation layer, and a protection layer (7). The heat insulation layer is installed on the main barrier wall (1), and the protection layer (7) covers an outer surface of the heat insulation layer. The heat insulation layer comprises, from the inside to the outside: a secondary barrier wall (3), a heat insulation plate, and a water resistance layer (6) in that order. The heat insulation plate comprises a foam glass plate (4) and a polyurethane foam plate (5). The foam glass plate (4) is attached to a surface of the secondary barrier wall (3) by an adhesive. The polyurethane foam plate (5) is attached to a surface of the foam glass plate (4) by an adhesive. The foam glass plate (4) is installed between the polyurethane foam plate (5) and the secondary barrier wall (3) made of metal, so that damage to the heat insulation layer caused by an expansion coefficient variation of thermal insulation materials when the temperature of the heat insulation system changes is avoided. Thermal stress change of the polyurethane foam due to temperature differences is also reduced and the heat insulation system is more safe and stable.

Description

technical field [0001] The invention belongs to the technical field of liquefied natural gas ships, and in particular relates to a thermal insulation system and a construction method of a B-type liquid cargo tank of a liquefied natural gas ship. Background technique [0002] Liquefied natural gas (LNG) is a low-temperature liquid formed by cooling gaseous natural gas at normal pressure to -163°C and condensing. Its main component is methane. LNG is colorless, odorless, non-toxic and non-corrosive, and emits less nitrogen oxides and sulfur dioxide during combustion. Therefore, it is recognized as a clean energy source, and its demand is increasing year by year. The volume of LNG is about 1 / 625 of the same amount of gaseous volume, and its weight is only about 45% of the same volume of water. Natural gas liquefaction can greatly save storage and transportation space and cost. LNG carrier is a special transport ship for liquefied natural gas. It is currently the most technica...

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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, what the present invention aims to solve is the problem of damage to the heat insulation layer that may be caused by the difference in the thermal expansion coefficient of the materials in the heat insulation system of the LNG ship and the problem of excessive PUR thermal stress caused by the large temperature difference between the inside and outside of the heat insulation board , providing a thermal insulation system for liquid cargo tanks of LNG ships and its construction method

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