The invention relates to a steam generator in which the continuous heating
panel of an evaporator is arranged in a heating gas channel which can be
cross-flown in a more or less horizontal direction of a heating gas. Said
continuous heating panel of the evaporator comprises a plurality of pipes
of a steam generator which are connected in parallel to each other. Said
pipes are constructed in such a way that they cross a flow medium and are
provided with the part of a more or less vertical down pipe which can be
cross-flown by the flow medium in a downward direction and with the part
of a rising pipe connected downstream with respect to the down pipe on
the side of the flow medium and which is more or less vertical and can be
cross-flown by the flow medium in an upward direction. The continuous
heating panel of the evaporator is arranged in such a way that one pipe
of the steam generator which is hotter than the other pipe of the steam
generator of the same continuous heating panel of the evaporator has a
flow medium rate which is higher than that of the other pipe of the steam
generator. The aim of said invention is to operate said steam generator
in a relatively simple manner in association with a highly stable flow in
the continuous heating panel of the evaporator. For this purpose, the
flow medium of the continuous heating panel of the evaporator is supplied
in such a way that the flow velocity thereof is higher than a minimum
flow velocity predefined in the down pipe. The inventive steam generator
is extremely well adapted for carrying out said method and comprises
another continuous heating panel of the evaporator which is connected
downstream with respect to the continuous heating panel of the evaporator
on the side of the flow medium.