Liquid heaters and vaporizers – Feeders – Automatic
Patent
1996-03-22
1998-06-30
Bennett, Henry A.
Liquid heaters and vaporizers
Feeders
Automatic
60 39182, 60665, F22D 530
Patent
active
057718466
ABSTRACT:
In a method for feed water control in waste heat steam generators, in particular drum boilers with a circulating pump (9) and drum boilers with natural circulation employed in combination power plants, wherein, by a three-component control by means of a superordinated level regulator (13) and a flow-through regulator (14) subordinated to the level regulator (13), the set value (S.sub.in) of the flow-through regulator (14) is displaced by the level regulator (13) in such a way that the level in the drum (6) is always regulated to the set value (S), regardless of interfering effects, the flow-through regulator (14) for the feed water flow (m.sub.s) is guided by the heat amount (Q.sub.AG) in the exhaust gas flow. The output signal of the flow-through regulator (14) for the feed water flow (m.sub.s) is limited, wherein as the function of the heat amount (Q.sub.AG) in the exhaust gas flow a selection is made between a limit value (m.sub.1) for the start-up operation and a limit value (m.sub.2) for normal control operation and the switch from (m.sub.1) to (m.sub.2) takes place via a time function element (16) with an idle time (T).
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Karl Joachim Thome-Kozmiensky, "Thermische Abfallbehandlung", pp. 404-405, 1994.
Asea Brown Boveri AG
Bennett Henry A.
Wilson Gregory A.
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