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Arrangement and method for the production of liquid natural gas

  • US 4,456,459 A
  • Filed: 01/07/1983
  • Issued: 06/26/1984
  • Est. Priority Date: 01/07/1983
  • Status: Expired due to Term
First Claim
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1. In a liquid natural gas manufacturing facility, an arrangement for improving liquid natural gas production, reducing flash gas production and conserving energy, comprising:

  • means operating to reduce the pressure of a super-cooled stream of liquid natural gas feed from a main exchanger of the liquid natural gas manufacturing facility, to extract work from both a liquid phase and a vapor phase formed during the reduction in pressure, and to separate the liquid and vapor phases into streams of liquid natural gas and flash gas;

    said means consisting of a hydraulic expander designed to extract work from both the liquid phase and vapor phase formed during the reduction in pressure, a low pressure flash means for separating the liquid and vapor phases, and a first flow conduit for feeding the super-cooled stream of liquid natural gas from the main exchanger to the hydraulic expander and for feeding the liquid and vapor phases exiting from an outlet of the hydraulic expander directly to an inlet of the low pressure flash means.

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