Liquefied gas treatment system

  • US 10,767,921 B2
  • Filed: 06/23/2016
  • Issued: 09/08/2020
  • Est. Priority Date: 05/30/2013
  • Status: Active Grant
First Claim
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1. A liquefied gas treatment system, comprising:

  • a boil-off gas supply line connected from a liquefied gas storage tank to a liquefied gas-consuming unit;

    a boil-off gas compressor provided on the boil-off gas supply line and pressurizing boil-off gas generated from the liquefied gas storage tank;

    a boil-off gas heat exchanger provided upstream of the boil-off gas compressor on the boil-off gas supply line and exchanging heat between the boil-off gas, pressurized by the boil-off gas compressor and recovered along the boil-off gas supply line branching off upstream of the liquefied gas-consuming unit, and the boil-off gas supplied from the liquefied gas storage tank;

    a boil-off gas decompressor provided downstream of the boil-off gas heat exchanger on a flow of the boil-off gas, recovered along the boil-off gas supply line, and decompressing the boil-off gas pressurized by the boil-off gas compressor;

    a vapor-liquid separator separating flash gas from the boil-off gas decompressed by the boil-off gas decompressor;

    a vapor recovery line connected from the vapor-liquid separator to the boil-off gas heat exchanger and supplying the flash gas to the boil-off gas heat exchanger;

    a flash gas recovery line extending the vapor recovery line from the boil-off gas heat exchanger to a mixer;

    the mixer provided upstream of the boil-off gas heat exchanger on the boil-off gas supply line, configured to mix the boil-off gas, supplied from the liquefied gas storage tank, with the flash gas, heat-exchanged by the boil-off gas heat exchanger, and supplying mixed gases to the boil-off gas heat exchanger;

    a first valve positioned between the boil-off gas heat exchanger and the mixer and configured to control flow of the flash gas supplied to the boil-off gas compressor by exhausting the flash gas to an outside of the liquefied gas treatment system;

    a flash gas bypass line branching off from the vapor recovery line and connected to a position between the first valve and the boil-off gas heat exchanger; and

    a second valve configured to control flow of the flash gas supplied to the position between the first valve and the boil-off gas heat exchanger through the flash gas bypass line.

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