초록 ▼

A multi-pressure reheat combined cycle configuration in which the HP steam turbine exhaust temperature is colder than the HP steam saturation temperature and the coldest section of the reheater is placed downstream of the high pressure evaporation section in the heat recovery steam generator gas pat

A multi-pressure reheat combined cycle configuration in which the HP steam turbine exhaust temperature is colder than the HP steam saturation temperature and the coldest section of the reheater is placed downstream of the high pressure evaporation section in the heat recovery steam generator gas path with respect to the direction of exhaust gas flow. When configured in this manner, the optimum reheat pressure for the cycle is lower then for a cycle with all reheating taking place upstream of the HP evaporation section in the HRSG gas path, and the cycle output and efficiency are improved.

대표청구항 ▼

[ What is claimed is:] [1.]1. A combined cycle system comprising:a gas turbine;a steam turbine; anda heat recovery steam generator for receiving exhaust gas from the gas turbine for heating steam from the steam turbine, said gas turbine exhaust gas flowing along an exhaust gas flow path from an entr

[ What is claimed is:] [1.]1. A combined cycle system comprising:a gas turbine;a steam turbine; anda heat recovery steam generator for receiving exhaust gas from the gas turbine for heating steam from the steam turbine, said gas turbine exhaust gas flowing along an exhaust gas flow path from an entry end to an exit end of the heat recovery steam generator,wherein said heat recovery steam generator includes an evaporator arranged to supply steam to a superheater between the evaporator and the entry end of the heat recovery steam generator, a reheater disposed along said exhaust gas flow path, said reheater receiving cold reheat steam from the steam turbine and returning reheated steam to the steam turbine,wherein the reheater includes at least first and second sections, said first section being downstream of said second section along said exhaust gas flow path through said heat recovery steam generator,wherein said first section of said reheater is disposed downstream of said evaporator along said exhaust gas flow path and said second section of said reheater is disposed upstream of said evaporator along said exhaust gas flow path, andwherein said first and second sections of said reheater are disposed in series flow such that cool reheat steam from the steam turbine is received by said first section of said reheater and steam leaving the first section of the reheater is supplied to said second section of said reheater.