Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1976-01-28
1977-07-19
Croyle, Carlton R.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
137599, 13762528, F02C 702, F01B 1714
Patent
active
040360113
ABSTRACT:
In a combined cycle plant, a process flow demand signal is applied to multiple sequentially operated boiler feedwater valves through a single manual/automatic (M/A) station. Each valve is positioned in accordance with its position/flow characterization so that the total feedwater flow to the boiler satisfies the flow demand. To provide for bumpless manual to automatic transfer, valve position signals are characterized with the inverse of the respective valve characterizations in the flow region not covered by a lower order valve. The characterized outputs are set to zero in flow regions covered by a lower order valve. A high selection of the characterized outputs is performed and the selected signal corresponds to the process flow demand value which will enable a manual to automatic transfer without causing an upset in steam generator process flow or electric power generation.
REFERENCES:
patent: 3135282 (1964-06-01), Gray
patent: 3205907 (1965-09-01), Reese
patent: 3357359 (1967-12-01), Schaub
patent: 3879616 (1975-04-01), Baker et al.
patent: 3919839 (1975-11-01), Aguet
Casaregola L. J.
Croyle Carlton R.
Possessky E. F.
Westinghouse Electric Corporation
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