| 摘要 |
This invention relates to a heating device consisting of at least one burner for the combustion especially of a gaseous fuel, at least one radiant tube connecting to the burner, at least one fan generating a negative pressure or an excess pressure in the radiant tube, and at least one exhaust gas recirculation system with at least one exhaust gas recirculation passage through which an exhaust gas produced during the combustion of the primary fuel can be recirculated from the radiant tube to a transition zone from the burner into the radiant tube. In order to further develop a heating device of this type as well as a method for its operation the burner is adapted for being operated in at least two power stages and the exhaust gas recirculation system is controlled in dependence of the power stages of the burner in such a way that the volume flow of the recirculated exhaust gas is reduced with an increasing power stage of the burner.
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