Multiple boiler steam blending control system for an electric power plant
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United States of America Patent
Stats
-
Dec 22, 1981
Grant Date -
N/A
app pub date -
Nov 28, 1979
filing date -
Nov 28, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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