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

United States Patent

May 22, 2007
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
An apparatus and method for producing liquefied natural gas. 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 passes through a turbo expander creating work output. A compressor is driven by the work output and compresses the process stream. The compressed process stream is cooled, such as by the expanded cooling stream. The cooled, compressed process stream is divided into first and second portions with the first portion being expanded to liquefy the natural gas. A gas-liquid separator separates the vapor from the liquid natural gas. The second portion of the cooled, compressed process stream is also expanded and used to cool the compressed process stream. Additional features and techniques may be integrated with the liquefaction process including a water clean-up cycle and a carbon dioxide (CO.sub.2) clean-up cycle.
Wilding; Bruce M. (Idaho Falls, ID), Bingham; Dennis N. (Idaho Falls, ID), McKellar; Michael G. (Idaho Falls, ID), Turner; Terry D. (Ammon, ID), Raterman; Kevin T. (Idaho Falls, ID), Palmer; Gary L. (Shelley, ID), Klingler; Kerry M. (Idaho Falls, ID), Vranicar; John J. (Concord, CA)
Battelle Energy Alliance, LLC (Idaho Falls, ID)
11/ 124,589
May 5, 2005
GOVERNMENT RIGHTS The United States Government has rights in the following invention pursuant to Contract No. DE-AC07-99ID13727 and Contract No. DE-AC07-05ID14517 between the U.S. Department of Energy and Battelle Energy Alliance, LLC.