所述装置（1）包括热（2），该热交换器具有用于从介质入口（4）用于热交换器入口（5）的介质（16）的进料管线（3），和一个排出管线（6） 从热交换器出口（7）。 初级旁路提供（8），所有这些从介质入口到排出线形成，并且从进料线的二次旁路（9）至介质出口（10）和阀（11,12,13,14） ，检查了来自热交换器出口到热交换器入口做的介质流动。 因此独立claimsoft包括用于操作蒸汽发生单元的热交换器的方法。

A device (1) having a heat exchanger (2) with a feed line (3) for a medium (16) by a medium inlet (4) to the heat exchanger inlet (5) and an outlet (6) from the heat exchanger output (7) is characterized in, that it comprises a first bypass (8) of the medium inlet (4) for deriving (6) and a second bypass (9) of the feed line (3) to the medium outlet (10) and valves (11-14) so ​​that the medium (16 ) also from the heat exchanger output (7) to flow to the heat exchanger inlet (5).