Patent ID: 7870718
Filing Date: 2011-01-18
Classification: F02C,F02M

Abstract:
1. A method of purging an exhaust stream from an exhaust gas recirculation (EGR) system, wherein the exhaust stream exits a gas turbine; the method comprising: providing the gas turbine comprising: an inlet, an external combustion system, and an exhaust section; wherein the gas turbine operatively produces an exhaust stream; providing the EGR system comprising: a first zone, a second zone; an EGR skid, an EGR inlet damper, and an EGR outlet damper; wherein the EGR system reduces the level of constituents within the exhaust stream and facilitates the sequestration and removal of concentrated CO2; providing an EGR purge system comprising: a first purge flow modulation device located within the first zone, and a second purge flow modulation device located within the second zone; operating the EGR purge system operatively with a benign fluid to remove remnants of the exhaust stream remaining in the EGR system when the EGR system is not in operation; establishing a pressure balance within the EGR system between the first purge flow modulation device and the second purge flow modulation device as the EGR system operates; and establishing a pressure drop between the first zone and the second zone of the EGR system.