Multiple boiler steam blending control system for an electric po

Details Multiple boiler steam blending control system for an electric po Multiple boiler steam blending control system for an electric po

1979-11-28

1981-12-22

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Power system involving change of state

F01K 1302

Patent

active

043064175

ABSTRACT:
A steam blending control is provided for two or more boilers in an electric power plant. To blend an oncoming boiler with an on-line boiler, the oncoming boiler is fired to a pressure ramp setpoint and outlet steam is isolated from the plant turbine and directed through position controlled bypass valve means. When steam temperature and pressure conditions are matched, the oncoming boiler isolation valve is opened and the bypass flow then existing is stored in a memory. The oncoming boiler bypass flow is cut back with total oncoming boiler steam flow controlled to the memorized flow valve as a setpoint. Flow from the on-line boiler is cut back under load control as the oncoming boiler flow to the plant turbine is increased. Deblending is implemented in a similar manner.

REFERENCES:
patent: 2918798 (1959-12-01), Schroder
patent: 4060990 (1977-12-01), Guido et al.

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