G - Physics – 05 – B
Patent
G - Physics
05
B
60/43, 322/6.4
G05B 13/02 (2006.01) F01D 17/08 (2006.01) F01K 23/10 (2006.01) G05B 15/00 (2006.01)
Patent
CA 1078014
COMBINED CYCLE ELECTRIC POWER PLANT WITH A STEAM TURBINE HAVING A SLIDING PRESSURE MAIN BYPASS AND CONTROL VALVE SYSTEM ABSTRACT OF THE DISCLOSURE A combined cycle electric power plant includes two gas turbines, a steam turbine, and a digital control system with an operator analog or manual backup. Each of the gas turbines has an exhaust heat recovery steam generator con- nected to a common header from which the steam is supplied by one or both of the steam generators for operating the steam turbine. The control system is of the sliding pressure type and maintains a predetermined steam pressure as a function or steam flow according to a predetermined characterization de- pending on the number of steam generators in service to limit the maximum steam velocity through the steam generators, and reduce the probability of water carryover into the steam tur- bine. Such control is always maintained by the bypass valve. The turbine control valve responds to the speed/load demand only, except when the bypass valve is closed and the rate of steam generation is insufficient to maintain a predeter- mined pressure flow relationship.
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