Gennemløbsdampgenerator og fremgangsmåde til en gennemløbsdampgenerators igangsætning

In a once-though steam generator having a double-flue configuration, a first gas flue is followed on the fuel-gas side, by way of a horizontal gas flue, by a second gas flue. In a once-through steam generator of this type, which is to have a particularly long lifetime even in the case of frequent start-up operations, according to the invention a number of steam generator tubes, connected in parallel for a flow medium to flow through them, are connected to one another to form an evaporator heating surface which is part of a containing wall of the first gas flue. The steam generator tubes which form the evaporator heating surface opening on an exit into an outlet header which is common to them and is disposed at a lower height in comparison with the bottom edge of the horizontal gas flue and which is followed, on the flow-medium side, by a bulkhead heating surface.