Method for operating a once-through steam generator and...

F - Mech Eng,Light,Heat,Weapons – 22 – B

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F22B 35/10 (2006.01)

Patent

CA 2727579

The invention relates to a method for operating a continuous flow steam generator comprising an evaporator heating surface (4), whereby a target value (Ms) for a supply water mass flow (M) is fed to a device for adjusting the supply water mass flow (M). In order to improve the quality of a predictive supply water or mass flow control and to maintain the enthalpy of the flow medium at the evaporator outlet particularly stable especially when load changes occur, a correction factor (K) is taken into consideration during production of the target value (Ms) for the supply water mass flow (M), said correction factor being characteristic of the temporal derivative of enthalpy or the density of the flow medium at the input of one or more heating surfaces (2, 4).

La présente invention concerne un procédé permettant de faire fonctionner un générateur de vapeur à circulation comprenant une surface de chauffe d'évaporateur (4). Selon l'invention, une valeur théorique (Ms) pour le débit massique d'eau d'alimentation (M) est transférée à un dispositif conçu pour régler le débit massique d'eau d'alimentation (M). L'objectif de l'invention est d'améliorer la qualité d'une régulation prédictive d'eau d'alimentation ou de débit massique et de maintenir l'enthalpie du milieu en circulation de façon particulièrement stable à la sortie de l'évaporateur, notamment en cas de variations de charge. A cette fin, une valeur de correction (K) caractéristique de la dérivation dans le temps de l'enthalpie ou de la densité du milieu en circulation à l'entrée d'une ou de plusieurs des surfaces de chauffe (2, 4) est utilisée lors du réglage de la valeur théorique (Ms) pour le débit massique d'eau d'alimentation (M).

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