The efficiency of an integrated coal gasification-combined cycle powerplant can be improved above that of conventional coal-fired steam powerplants by increasing the gas turbine component firing temperature and pressure ratio while limiting component cooling requirements. A stage of the development of a transpiration-air-cooled turbine for operation at 2600 F (1427 C) and above in a combusted coal-derived fuel environment is presented. Results are presented from 300 hr of turbine cascade and 400 hr of rig-engine tests conducted at up to 3000 F (1649 C) using a jet fuel “doped” with aluminum oxide or fly ash to simulate the potentially erosive and corrosive nature of coal derived fuels. The metallographic examinations and flow permeability discussed in terms of the effects from particle deposition.

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