METHOD TO PRODUCE NATURAL GAS LIQUIDS (NGL'S) AT GAS PRESSURE REDUCTION STATIONS
First Claim
1. A method to recover Natural Gas Liquids (NGL'"'"'s) at Pressure Reduction Stations, comprising the steps of:
- providing at least one heat exchanger, each heat exchanger having a flow path for passage of a high pressure natural gas stream and a counter current passage for a depressurised cold lean gas stream;
passing the high pressure natural gas stream along the heat exchanger in order to cool the high pressure natural gas stream through a heat exchange with the depressurized cold lean gas stream before pressure reduction, such that hydrates are condensed out of the high pressure natural gas stream;
removing hydrates from the high pressure natural gas stream;
passing the high pressure natural gas stream, which has had hydrates removed, through a gas expander to reduce pressure of the natural gas stream;
passing the natural gas stream, which has been reduced in pressure through a separator to produce a first stream of depressurized cold lean natural gas and a second stream of NGL'"'"'s.
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Accused Products
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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Citations
6 Claims
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1. A method to recover Natural Gas Liquids (NGL'"'"'s) at Pressure Reduction Stations, comprising the steps of:
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providing at least one heat exchanger, each heat exchanger having a flow path for passage of a high pressure natural gas stream and a counter current passage for a depressurised cold lean gas stream; passing the high pressure natural gas stream along the heat exchanger in order to cool the high pressure natural gas stream through a heat exchange with the depressurized cold lean gas stream before pressure reduction, such that hydrates are condensed out of the high pressure natural gas stream; removing hydrates from the high pressure natural gas stream; passing the high pressure natural gas stream, which has had hydrates removed, through a gas expander to reduce pressure of the natural gas stream; passing the natural gas stream, which has been reduced in pressure through a separator to produce a first stream of depressurized cold lean natural gas and a second stream of NGL'"'"'s. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification