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System and method for utilizing lng for fuel to liquefy lpg boil-off gas

A technology for evaporating gas and fuel supply systems, applied in the direction of gas processing/storage purposes, liquefaction, refrigeration and liquefaction, etc., can solve the problem of not describing the evaporation and reliquefaction system

Active Publication Date: 2016-03-16
WARTSILA OIL & GAS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US2795937 teaches that the heat exchange prevents any evaporative gas from the surface of the liquid and therefore does not describe an evaporative reliquefaction system

Method used

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  • System and method for utilizing lng for fuel to liquefy lpg boil-off gas
  • System and method for utilizing lng for fuel to liquefy lpg boil-off gas
  • System and method for utilizing lng for fuel to liquefy lpg boil-off gas

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Embodiment Construction

[0028] LPG is to be understood as a range of different varieties or products of petroleum gas stored and transported as a liquid cargo. Of the various petroleum gases, propane and butane are prime examples; propane typically includes ethane in any concentration from 0% to 5% by volume; butane in propane can be present in any concentration from 0% to 20% by volume . This mixture consisting mainly of propane (typically 70% to 98% by volume) is called commercial propane, and is hereinafter referred to as propane.

[0029] Butane can be any mixture of n-butane and isobutane with possible fractions of unsaturated hydrocarbons and is referred to hereinafter as butane.

[0030] In addition to propane and butane, LPG shall at least include the following varieties:

[0031] ammonia,

[0032] Butadiene,

[0033] butane-propane mixture (any mixture),

[0034] Butene,

[0035] ether,

[0036] Propylene,

[0037] vinyl chloride.

[0038] LPG stored and transported at sub-ambient t...

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Abstract

The present invention relates to a method and system for liquefying LPG boil-off gas (BOG), said system comprising an LNG fuel supply system and an LPG cargo system, wherein said LNG fuel system comprises at least one LNG fuel tank 23, an LNG fuel pipeline 5 and a second Two LNG fuel pipelines 13, wherein the LPG cargo system includes at least one LPG cargo tank 20, BOG pipeline 1, at least one reliquefaction unit 100 and condensation pipeline 3; wherein the system also includes: provided between the LNG fuel tank 23 and the second At least one vaporizer 15, 22 on the LNG fuel pipeline 5 between the two LNG fuel pipelines 13, wherein the at least one vaporizer 15, 22 performs heat exchange with the LPG cargo system.

Description

technical field [0001] The present invention relates to systems and methods for utilizing LNG for fuel to liquefy LPG boiloff. Background technique [0002] current technology [0003] KR20100102872 discloses a method for simultaneous reception of LPG and LNG streams on complex vessels or floating production storage and offloading vessels. The invention described in KR20100102872 solves how to utilize the low temperature of the LNG boil-off gas to condense the LPG boil-off gas before compression and liquefaction to reduce the complexity of the LPG reliquefaction system. [0004] KR20100102872 uses sensible heat of LNG boil-off gas to condense LPG boil-off gas in contrast to the present invention which uses a combination of latent and sensible heat of LNG in combination with an LNG fuel gas system to condense LPG boil-off gas. [0005] US5860294 describes a method for condensing gaseous hydrocarbons from a mixture of inert gases and gaseous hydrocarbons, in particular as f...

Claims

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Application Information

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IPC IPC(8): F25J1/02F17C1/00F25J1/00
CPCF17C2201/052F17C2205/0323F17C2221/033F17C2221/035F17C2223/0123F17C2223/0153F17C2223/0161F17C2223/033F17C2225/0153F17C2225/0161F17C2225/0169F17C2225/033F17C2227/0157F17C2227/0171F17C2227/0185F17C2227/0337F17C2227/0341F17C2227/0355F17C2227/0388F17C2227/0393F17C2260/021F17C2260/031F17C2265/032F17C2265/033F17C2265/034F17C2265/035F17C2265/05F17C2270/0105F25J1/0025F25J1/0045F25J1/0202F25J1/0224F25J1/0277F25J1/0292F25J2210/06F25J2210/62F25J2215/64F25J2215/66F25J2290/34F17C1/00F25J1/00F25J1/02
Inventor 卡尔·约根·鲁梅尔霍夫
Owner WARTSILA OIL & GAS SYST
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