| 摘要 |
Once-through steam generator 91), in which in channel of hot gas (6) through which substensially in horizontal direction hot gas (X) flows continuous heating surface of evaporator is placed, this surrounds large number of connected in parallel for passage of flow medium (W) steam generator tubes (12), is to have at especially small design losses high level of operation reliability and high effectiveness. That for continuous heating surface (8) of evaporator has according to the invention segment of heating surface (26) through which fluid medium flows (W) in opposite direction with respect to hot gas (6) outlet (16) of which on side of fluid medium with respect to heated gas direction (X) is positioned in such way that temperature of saturated steam which is adjusted during operation at exit from said continuous heating surface (8) of evaporator deviates from predetermined maximum value of the temperature of the hot gas prevailing during operation at the outlet (16) of the segment of the heating surface. That for entry collector or entry collectors (14), respectively, are placed on side of gas close from inlet of that heating surface (8) so that the speed of fluid medium (W) in first section of downpipe (22) is higher tham minimum speed needed for pulling of stem nascent bubbles. |
