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Method and system for inerting a wall of a liquefied fuel gas-storage tank

A liquefied gas fuel and tank wall technology, applied in fixed capacity gas storage tanks, container discharge methods, container filling methods, etc., can solve the problems that gas analyzers cannot provide reliable detection data, etc.

Active Publication Date: 2016-11-02
GAZTRANSPORT & TECHNIGAZ SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, most gas analyzers cannot provide reliable detection data at low pressures

Method used

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  • Method and system for inerting a wall of a liquefied fuel gas-storage tank
  • Method and system for inerting a wall of a liquefied fuel gas-storage tank
  • Method and system for inerting a wall of a liquefied fuel gas-storage tank

Examples

Experimental program
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Embodiment Construction

[0053] figure 1 A tank 1 for storing a gaseous fuel is shown. Each tank wall 1 comprises a multi-layer structure, from the outer layer to the inner layer, the multi-layer structure includes a load-bearing structure 2 defining the general shape of the tank 1, a secondary insulation layer 3 comprising a Insulating elements on the load-bearing structure 2, a secondary anti-seepage membrane 4, a primary thermal insulation layer 5, the primary thermal insulation layer 5 includes insulating elements resting on the secondary anti-seepage membrane 4, and a primary anti-seepage Membrane 6, the primary impermeable membrane 6 is used to contact the liquefied gaseous fuel in the tank 1.

[0054] The load-bearing structure 2 can in particular be a self-moving sheet metal and / or consist of the hull or double hull of a tanker.

[0055] The thermal insulation layer 3 and the thermal insulation layer 5 comprise insulating solid material and a gas phase. According to one embodiment, the ther...

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Abstract

The invention relates to a method for inerting a wall of a sealed and thermally insulating tank (1), said tank being intended to contain a liquefied fuel gas, wherein the wall has a multilayer structure comprising two sealed barriers (2, 4) and a thermally insulating barrier (3), said method including: implementing a first inerting mode in which the gaseous phase of the thermally insulating barrier (3) is placed under a relative pressure which is lower than a pressure limit of inflammability Pi of the fuel gas; detecting, during the first inerting mode, whether the pressure of the gaseous phase of the thermally insulating barrier (3) exceeds said threshold pressure Ps; and switching from the first inerting mode to a second inerting mode, the second inerting mode including sweeping the thermally insulating barrier (3) with an inert gas.

Description

technical field [0001] This invention relates to the inerting of the walls of a seepage-proof and insulated tank for holding liquefied gaseous fuels. [0002] The invention is especially suitable for the inertization of membrane tank walls for storing liquefied natural gas. Background technique [0003] The anti-seepage and heat-insulation tank used to store liquefied natural gas usually includes a tank wall. The tank wall is continuous from the inner side to the outer side of the tank in the thickness direction with a first-level anti-seepage film for contact with liquefied natural gas. Insulation, a secondary barrier membrane, a secondary insulation and a load-bearing structure defining the general shape of the tank. [0004] The tank's impermeable membrane could leak, and liquid would flow from the tank to the primary insulation and secondary insulation into the passageway for the LNG. However, when the gaseous fuel is an oxidizing gas, the concentration of the gaseous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C3/10F17C13/02F17C13/12
CPCF17C3/10F17C13/02F17C13/025F17C13/126F17C2250/032F17C2250/036F17C2250/0636F17C2250/072F17C2250/043F17C2250/0452F17C2250/0491F17C2260/042F17C2201/052F17C2201/0157F17C2203/0333F17C2203/0325F17C2203/0329F17C2203/035F17C2203/0341F17C2203/0631F17C2203/0358F17C2203/0379F17C2203/0391F17C2223/0161F17C2221/01F17C2221/035F17C2221/03F17C2223/033F17C3/085F17C13/001
Inventor 布鲁诺·德莱特雷法布里斯·隆巴尔
Owner GAZTRANSPORT & TECHNIGAZ SA