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GAS TURBINES—1: Supersonic ejector captures, reinjects leaked vent gases

01/14/2008
A two-stage supersonic ejector can capture low-pressure gas such as that being vented from a typical first stage dry-gas seal, and discharge it for re-injection into a higher-pressure stream at 3,400 kPa (atmospheric) for fuel-gas utilization.The ejector device seeks to capture gas leakage from a dry-gas seal at low pressure and reinject it into the fuel-gas line to the gas generator (without the use of compressors or rotating elements), allowing the use of gas that would otherwise be vented to atmosphere. This device eliminates costs associated with gas loss and reduces greenhouse gas emitted by the dry-gas seal to the atmosphere.Leakage gas pressure of 70-340 kPa (gauge) presents one of...
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