Forced once-through steam generator

Details Forced once-through steam generator Forced once-through steam generator

1994-11-04

1996-06-25

Bennett, Henry A.

Liquid heaters and vaporizers

Automatic control of fluid fuel and water

1224484, F22B 3742

Patent

active

055290213

ABSTRACT:
A forced once-through steam generator with an evaporator heating surface has a control device for a furnace which is controlled by a setpoint value L assigned to the steam generator power and a control device for a feed-water mass flow M into the evaporator heating surface. In order to avoid an overshoot of a specific enthalpy at an outlet of the evaporator heating surface, a device is superimposed on the feedwater control device which serves to derive a variable Q(L1)/,[h.sub.sA (L2)-h.sub.iE) as a setpoint value M.sub.s for the feed-water mass flow. In this case h.sub.iE is the specific enthalpy at an inlet of the evaporator heating surface, Q(L1) is a value derived by a first power value L1 from a function generator for a heat flow into the evaporator heating surface and h.sub.sA (L2) is a setpoint value derived by a second power value L2 from the function generator for the specific enthalpy at the outlet of the evaporator heating surface. L1 is a first power value which is delayed with respect to the setpoint value L assigned to the steam generator power, and L2 is a second power value which is delayed with respect to the first power value L1.

REFERENCES:
VGB Kraftwerkstechnik 65, No. 1, Jan. 1985, pp. 25-33 (Lausterer et al.) "Temperature or Enthalpy as Main Control Variable for Benson Boilers";.

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