Liquefied natural gas carrier B type independent liquid cargo tank thermal insulation system and construction method thereof

Abstract

The invention relates to a liquefied natural gas carrier B type independent liquid cargo tank thermal insulation system with a sealing secondary screen wall. The liquefied natural gas carrier B type independent liquid cargo tank thermal insulation system comprises a thermal insulation layer, wherein the thermal insulation layer comprises a splash-proof screen, a secondary screen wall layer, a thermal insulation plate, an upper plate piece and a protection layer, the secondary screen wall layer is continuously bonded on the upper surface of the splash-proof screen, the thermal insulation plate is arranged between the splash-proof screen and the upper plate piece in a clamped mode, and the protection cover covers the outer surface of the upper plate piece. The thermal insulation layer of the thermal insulation system is continuously installed on and fixed to the periphery of a liquid cargo tank main screen wall, so that a thermal insulation enclosure layer for an LNG liquid cargo tank is formed. By means of the structure of the thermal insulation system, it is ensured that a communication interval passageway is formed between the main screen wall and the splash-proof wall, and when leakage happens to the main screen wall, liquefied natural gas which leaks can flow into a collection container through an interval space. The thermal insulation system further comprises a fixing mechanism of the thermal insulation layer, wherein the fixing mechanism can stably support the whole thermal insulation layer and fix the whole thermal insulation layer to the main screen wall.

Description

technical field [0001] The present invention relates to the technical field of a liquefied natural gas ship, in particular to a type B independent liquid cargo tank thermal insulation system of a liquefied natural gas ship with a sealed secondary barrier and a construction method thereof. The thermal insulation system is continuously installed and fixed on the main barrier of the liquid cargo tank Around, form a thermal insulation envelope for LNG liquid cargo. Background technique [0002] Liquefied natural gas refers to a colorless, transparent low-temperature liquid that cools natural gas whose main component is methane to about -163°C and compresses it to 1 / 600 of its gas volume. It is an important clean energy. The liquefied natural gas ship is the main means of transportation of liquefied natural gas at sea. It is a high-tech, high-difficulty and high-value-added ship, known as the "crown jewel" of the world's shipbuilding. [0003] During the voyage of LNG ships, th...

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Problems solved by technology

[0006] Aiming at the problem that the existing LNG ship insulation system is not suitable for installation on IMO B-type liquid cargo tanks, the problem to be solved by the present invention is the construction and installation of the new LNG ship insulation system, and provides a B-type independent LNG ship Cargo Tank Thermal Insulation System and Method of Construction

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