In recent years the constructors as well as the users of municipal and industrial power plants have shown a rising interest in the closed-cycle gas turbine. Because of its ability to deliver a large amount of heat without restrictions to the electric power generation, the closed-cycle gas turbine is most favorably qualified for central district heating of large residential quarters. In this paper these aspects of the closed-cycle will be illustrated in the frame of five closed air turbine plants, being in operation in the FRG. The layout of and the operation experience gained with these plants will be discussed. These municipal and industrial power plants are fueled by coal, oil, gas, or even mixtures of these. The special items in the layout of the heaters with respect to the different fuels are shown; the perspectives for further design are discussed.

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