Patent ID: 7730711

Claim:
A nitrogen purge sub-system for a liquid fuel system for a dual fuel combustion turbine, the fuel system having at least one cavity, said nitrogen purge sub-system comprising a purge-air subsystem, a source of nitrogen coupled to a pipe in flow communication with the cavity, said nitrogen purge sub-system further comprising at least one three-way valve that controls flow of nitrogen from said source to the cavity via said pipe, said at least one three-way valve having an open condition, wherein nitrogen flows from said source through said pipe and into the cavity to facilitate removal of liquid fuel and air from the cavity such that a formation of a carbonaceous precipitate particulate is mitigated, said nitrogen purge subsystem further comprising a drain valve coupled in flow communication with said at least one three-way valve; and wherein the purge-air subsystem is in flow communication with the three-way valve to facilitate removal of liquid fuel in a combustor.