rfahren for operating a with a steam temperature of more than 650°C. operating forced once-through steam generator as well as forced-circulation steam generator

摘要

A method for operating a in the sliding or variable pressure and with a steam temperature of more than 650°C. and the lowering of the operating forced once-through steam generator through the barrel at least load, wherein the forced-circulation steam generator into the water / steam, leading to the working medium - circuit of a power plant is bound and the economizer of the forced once-through steam generator, as seen in the working medium - circulating direction upstream of at least one hd - preheater and / or a heat shifting system for the preheating of the working medium, wherein the working medium within the / the hd - preheater, heat from the bled steam turbines can be supplied current and in the heat shifting the system heat from a supplied externally heat current, characterized in that when the pressure falls below a predetermined part load point (l_T) the heat absorption of the working medium within at least one hd - preheater and / or the heat shifting system is reduced such that the temperature of the operating medium, water / steam at the outlet of the economizer in the distance of a predetermined temperature difference (t_D) below the on the corresponding economizer outlet pressure is related.