An MS5000 gas turbine is now being redesigned for integrated operation on low Btu Lurgi coal gas in the Powerton Gasification Combined Cycle Test Facility. Air is extracted from the machine to provide process air for the gasifiers, and a heat recovery steam generator provides steam for the gas plant. This paper describes the design modifications to the gas turbine and its control system to accommodate such operation. Since the facility will demonstrate operation in a variety of control modes using gas produced from a wide range of domestic coals, the gas turbine control system emphasizes flexibility and incorporates several functions unique to low Btu gas applications. Major modifications to the fuel and combustion systems are also required. Test results on the resulting new combustor design are reported in a companion paper (1).

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