High-Pressure Boilers With Reheaters

When power generating equipment is designed to operate within the reheat steam cycle, the steam generating unit includes a reheat section in which partly expanded steam, returned from the turbine, is reheated before final expansion takes place. Reheat boiler units which have been in service for more than 20 years are described, together with some modern high-pressure high-temperature units. Comparison of reheat with nonreheat steam generating units to generate the same kilowatt capacity at the same boiler efficiency and draft loss is shown, together with estimated cost increase of the reheat boilers.