William G Lopes

US Patent:

42088828, Jun 24, 1980

Filed:

Dec 15, 1977

Appl. No.:

5/860721

Inventors:

William F. Lopes - North Reading MA
William G. Carberg - Georgetown MA

Assignee:

General Electric Company - Schenectady NY

International Classification:

F01K 734

US Classification:

60653

Abstract:

In a combined cycle power plant comprising a steam turbine and gas turbine connected through a heat recovery steam generator, the start-up mode for a steam turbine is based upon the shell metal temperature of the steam turbine. In some combined cycle plants, the output of the gas turbine is reduced so as to more closely match the output steam temperature of the heat recovery steam generator to the steam turbine metal temperature. This arrangement can be disadvantageous for several reasons and so it is proposed that a spray attemperator or desuperheater be incorporated between the heat recovery steam generator outlet and the steam turbine inlet. Moreover, control means are indicated for controlling the fluid input into the attemperator.