Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1985-08-21
1987-05-19
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60652, 60660, F01K 1302
Patent
active
046657061
ABSTRACT:
A system for the operation of once-through boilers which utilizes variable throttle pressure over a very wide load operating range is disclosed. The system utilizes a valving arrangement permitting the turbine valve (22) to be opened to a predetermined open position, typically 70 percent of its full open position, as soon as possible during the system loading process, maintaining the turbine valve (22) in this predetermined open position while the flow of steam from the boiler is being varied by a control valve (40) and the output pressure of the boiler is varying accordingly, and then allowing the turbine valve (22) to open further from the predetermined open position when the system reaches full design pressure so as to vary the flow of steam from the boiler while the output pressure thereof is maintained substantially constant. In this manner, the boiler is operated at a variable output pressure over a very wide load operating range.
REFERENCES:
patent: 3175367 (1965-03-01), Gorzegno et al.
patent: 3194217 (1965-07-01), Grabowski
patent: 3271961 (1966-09-01), Wiener
Russell Thomas D.
Walker Robert R.
Edwards Robert J.
Matas Vytas R.
Ostrager Allen M.
The Babcock & Wilcox Company
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