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Apparatus for the liquefaction of a gas and methods relating to same

United States Patent

December 29, 2009
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Apparatuses and methods are provided for producing liquefied gas, such as liquefied natural gas. In one embodiment, a liquefaction plant may be coupled to a source of unpurified natural gas, such as a natural gas pipeline at a pressure letdown station. A portion of the gas is drawn off and split into a process stream and a cooling stream. The cooling stream may sequentially pass through a compressor and an expander. The process stream may also pass through a compressor. The compressed process stream is cooled, such as by the expanded cooling stream. The cooled, compressed process stream is expanded to liquefy the natural gas. A gas-liquid separator separates the vapor from the liquid natural gas. A portion of the liquid gas may be used for additional cooling. Gas produced within the system may be recompressed for reintroduction into a receiving line.
Turner; Terry D. (Idaho Falls, ID), Wilding; Bruce M. (Idaho Falls, ID), McKellar; Michael G. (Idaho Falls, ID)
Battelle Energy Alliance, LLC (Idaho Falls, ID)
11/ 536,477
September 28, 2006
GOVERNMENT RIGHTS This invention was made with government support under Contract No. DE-AC07-05ID14517awarded by the U.S. Department of Energy. The United States Government has certain rights in this invention.