Abstract
The Central Electricity Generating Board's current plans for new generating capacity using fossil fuels are based on the use of large boiler-turbine units in which reheating of the steam after initial expansion is employed. The background to the development of these units is reviewed and the ways in which the use of reheat affects the design of the main items of plant, the significance of unit rating and its influence on design, and the special requirements imposed by the need for the plant to be suitable for two-shift operation are considered. Reference is also made to certain aspects of the design of generators and of some items of auxiliary equipment which, although not related to the use of reheat, are very much a part of current practice. Some of the problems encountered in the evolution of the latest designs are discussed, and the solutions to them currently adopted described.
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