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Method for determining optimal value of at least one parameter for implementing method for cooling watertight and thermally insulating tank

A thermal insulation and optimal value technology, applied in the direction of container discharge method, container filling method, outer wall of container structure, etc., can solve the problem of a large amount of liquefied gas and the reduction of transportation capacity of liquefied gas, and achieve the effect of ensuring safety

Active Publication Date: 2020-06-26
GAZTRANSPORT & TECHNIGAZ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prior art cooling procedures require large quantities of liquefied gas
The amount of liquefied gas that must remain in tanks now reduces transport capacity

Method used

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  • Method for determining optimal value of at least one parameter for implementing method for cooling watertight and thermally insulating tank
  • Method for determining optimal value of at least one parameter for implementing method for cooling watertight and thermally insulating tank
  • Method for determining optimal value of at least one parameter for implementing method for cooling watertight and thermally insulating tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] exist figure 1 In , a tank 1 for storing liquefied gases is presented. A tank 1 of this type may in particular be installed on a floating structure, for example on a ship for transporting liquefied natural gas, such as a methane storage tank or an ethane storage tank.

[0049] Tank 1 is a membrane tank for storing liquefied gas. The tank 1 has a multilayer structure comprising, from the outside to the inside: a second-level thermal insulation barrier 2, comprising insulating elements not shown, resting against a support structure 3; a sealing film 4, which rests against the second-level thermal insulation barrier 2; a first-level thermal insulation barrier 5, which comprises insulating elements not shown, is sealed against the second-level membrane 4 rest; and a primary sealing membrane 6 intended to come into contact with the liquefied gas contained in tank 1 . The primary sealing membrane 6 defines an internal space 11 intended to receive liquefied gas. Such membr...

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Abstract

The invention relates to a method for determining an optimal value of at least one first parameter for implementing a method for cooling an internal space (11) of a tank (1), the method comprising: successively testing a plurality of different values of the first parameter, each test phase for one of the values of the first parameter comprising: cooling the internal space (11) of the tank (1); thecooling capacity Pf or the final target temperature Tc being representative of the tested value of the first parameter; o loading the liquefied gas into the internal space (11) of the tank (1) aftercooling; measuring a variable P1 which is representative of the pressure inside the thermally insulating barrier (5) and comparing said variable to at least one predetermined threshold; and o detecting a fault when the variable P1 crosses the at least one predetermined threshold; and choosing, from among the plurality of values tested, as an optimal value of the first parameter, the value for which, during the corresponding test phase, the time [delta] needed to cool the internal space (11) is the shortest and no fault has been detected.

Description

technical field [0001] The present invention relates to the field of liquid-tight thermally insulated tanks for storing liquefied gas cargoes, such as liquefied natural gas (LNG). [0002] More particularly, the invention relates to a method for determining an optimal value of at least one parameter for performing a cooling of a liquid-tight thermally insulated tank. Background technique [0003] In the prior art it is known to cool the tanks of a ship intended to transport liquefied natural gas before loading cargo into the tanks. The purpose of this cooling is to reduce the temperature inside the tank, in particular to prevent excessive vaporization of the liquefied gas during loading, to limit the intensity of thermal stress on certain components housed in the tank and to prevent the safety and / or Integrity degradation situations. This cooling step is carried out by spraying and vaporizing liquefied gas on the upper part of the tank. [0004] In some applications, liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C6/00
CPCF17C6/00F17C2201/052F17C2203/0379F17C2203/0604F17C2203/0624F17C2205/0323F17C2221/033F17C2221/035F17C2223/0153F17C2223/0161F17C2223/033F17C2225/0161F17C2225/033F17C2225/044F17C2227/0339F17C2227/0369F17C2227/04F17C2260/021F17C2260/025F17C2270/0105F17C13/025F17C2225/0153F17C2227/0376
Inventor 法布里斯·隆巴尔马克西姆·科延
Owner GAZTRANSPORT & TECHNIGAZ
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