Method to produce natural gas liquids NGLs at gas Pressure Reduction Stations
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United States of America Patent
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Feb 4, 2014
Grant Date -
Nov 19, 2009
app pub date -
May 15, 2008
filing date -
May 15, 2008
priority date (Note) -
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Abstract
A method to recover NGL's at gas Pressure Reducing Stations. A first step involve providing at least one heat exchanger having a flow path for passage of high pressure natural gas with a counter current depressurized lean cold gas. A second step involves passing the high pressure natural gas stream in a counter current flow with the lean cold gas and cooling it before de-pressurization. A third step involves the expansion of the high pressure cooled gas in a gas expander. The expansion of the gas generates shaft work which is converted into electrical power by the power generator and the expanded low pressure and cold gas enters a separator where NGL's are recovered. This process results in the recovery NGL's, electricity and the displacement of a slipstream of natural that is presently used to pre-heat gas at Pressure Reduction Stations.
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