Abstract: A method for conveying a chemical solution containing a phosphonic acid as an iron dissolving agent through the quaternary annulus chambers in forward combustion cans of a gas turbine to dissolve the iron oxide deposits and thereby facilitate cleaning of the internal fuel pathways. The method uses a cleaning flange attached to the quaternary fuel flange that has a flow directing baffle that enters the quaternary fuel orifice and directs the flow of cleaning solution in one direction in the quaternary annulus chamber.

Abstract: A gas turbine combustor structure having improved cooling effectiveness and increased life as well as a method for improving the cooling effectiveness is disclosed. The gas turbine combustor incorporates a unique flow sleeve configuration for directing air to more effectively cool a combustion liner. The flow sleeve geometry is configured to incorporate a conical aft portion having a plurality of air feed holes that reduce pressure loss to the incoming air and flow separation effects from the surrounding combustor hardware, thereby resulting in improved combustor performance.