METHOD FOR THE OPERATION OF A ONCE-THROUGH STEAM GENERATOR WITH LOW LOAD RECIRCULATION

摘要

The steam generator of the present invention is connected to a feed pump (5), economizer (1), vaporizer (2), water separator (3) and at least one super heater (4), and also to the water outlet of the water separator (3). At the same time there is provided a circulation line 20 for discharging the flow of the working medium between the feed pump and the economizer. Between the discharge point 19 of the circulation line 20 and the economizer 1, the circulation pump 23 and the level control valve 24 thereafter are arranged. The method of operating such a steam generator is to adjust the water supply above the minimum flow rate of the economizer 1 in accordance with the steam temperature downstream of the water separator 3, and disposed between the circulation pump 23 and the economizer 1 By driving the level control valve 24, the water level of the water separator 3 is controlled to be equal to or less than the minimum flow rate of the economizer 1.;Therefore, the water level control for supplying water in the steam temperature control does not require the normal switching of the steam temperature control or the reverse switching thereof.