Liquid heaters and vaporizers – Feeders – Automatic
Patent
1997-05-14
1998-09-22
Bennett, Henry A.
Liquid heaters and vaporizers
Feeders
Automatic
1224512, 60 39182, F22D 526, F02C 600
Patent
active
058099433
ABSTRACT:
The device for precontrolling the feedwater quantity of a cooling-air temperature controller (1) for a once-through cooling-air cooler (2) in combined power plant systems comprises a function element which has as inputs the signals corresponding to the air-outlet desired temperature (.THETA..sub.a soll), the air-inlet temperature (.THETA..sub.e), the air volume flow (M), the main steam pressure (p) and the water-inlet temperature (.theta..sub.e), and as outputs the signals of the approximated precontrolled feedwater volume flow (m.sub.FFO) and the controller gain (VR). A correcting quantity depending on the load (L) and the ambient temperature (T.sub.U) is additionally introduced for operation in the unsaturated temperature range.
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Asea Brown Boveri AG
Bennett Henry A.
Wilson Gregory A.
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