F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
122/18
F22B 35/10 (2006.01) F01K 3/22 (2006.01)
Patent
CA 1211324
-11- CONTROL SYSTEM FOR VARIABLE PRESSURE ONCE-THROUGH BOILER ABSTRACT OF THE DISCLOSURE A system for the operation of once-through boilers which utilizes variable throttle pressure over a very wide load opera- ting range is disclosed. The system utilizes a valving arrange- ment permitting the turbine valve (22) to be opened to a prede- termined 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 main- tained substantially constant. In this manner, the boiler is operated at a variable output pressure over a very wide load operating range.
402639
Russell Thomas D.
Walker Robert R.
Babcock & Wilcox Company (the)
Ridout & Maybee Llp
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