Method of cooling boil off gas and apparatus therefor

Method of cooling boil off gas and apparatus therefor

  • CN 103,717,959 A
  • Filed: 04/03/2012
  • Published: 04/09/2014
  • Est. Priority Date: 04/19/2011
  • Status: Active Grant
First Claim
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1. a method for the boil-off gas stream (01) that the goods of the liquefaction in cooling unsteady ships that transport produces, the goods of described liquefaction has and under 1 barometric pressure, is greater than the boiling point of-110 ℃

  • and comprises various ingredients, and described method comprises at least following steps;

    -in two or more stages that comprise at least compression of first stage (65) and final stage (75), compress boil-off gas stream (01) that the goods of described liquefaction produces so that the BOG discharge stream (06) of compression to be provided, wherein the described final stage (75) with first stage discharge pressure and compression of the described first stage (65) of compression has final stage suction pressure and one or more centres, selectively cooling, the BOG stream (02,03,04) of compression is provided between the successive stages of compression;

    The BOG discharge stream (06) of-cooling described compression is to provide the BOG stream (08) of cooling aeration flow (51) and cooling compression;

    -expand, selectively after further cooling, a part for the BOG of described cooling compression stream (08) to the pressure between the pressure of described first stage discharge pressure and the pressure of described final stage suction pressure so that the cooling BOG stream (33) of expansion to be provided;

    -make the cooling BOG stream (33) of described expansion carry out heat exchange so that further cooling aeration flow (53) to be provided near described cooling aeration flow (51).

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