Liquid heaters and vaporizers – Feeders – Automatic
Patent
1985-08-14
1986-10-28
Yuen, Henry C.
Liquid heaters and vaporizers
Feeders
Automatic
122488, 122451S, F22D 526
Patent
active
046192247
ABSTRACT:
An apparatus for controlling the drum water level of a drum boiler prevents the boiler system from being tripped off which would otherwise be caused by an excessive fall in the drum water level immediately after the start of load runback, by increasing the real feed water flow rate in such a manner that a feed water flow rate demand signal obtained from the drum water level deviation is corrected by a feed water flow rate increment signal obtained from the amount of load reduction (load demand--load reference after load runback) at the time of load runback. In addition, the fact that the drum water level stops falling and starts to rise is detected, and the feed water flow rate demand signal is adjusted so as to take a medium value between the real feed water flow rate and the real main steam flow rate, thereby preventing the boiler system from being tripped off which would otherwise be caused by an excessive rise in the drum water level.
REFERENCES:
patent: 3518974 (1970-07-01), Bradley
patent: 3780705 (1973-12-01), LeFebue de Vivy
patent: 4242989 (1981-01-01), Chamberlain
patent: 4258668 (1981-03-01), Bekedam
patent: 4465027 (1984-08-01), Steinegger
patent: 4520762 (1985-06-01), Martin
Honda Naganobu
Sugano Akira
Takita Atsushi
Hitachi , Ltd.
Yuen Henry C.
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