STEAM GENERATOR HEATING SURFACE COMPRISING A MULTITUDE OF APPROXIMATELY PARALLEL HEATING TUBES THROUGH WHICH A COOLING AGENT PASSES

摘要

The invention relates to a heating surface of a steam generator comprising a multitude of approximately parallel heating tubes through which a cooling agent passes. Said heating tubes are arranged in the flow channel of the steam generator by means of mountings. The aim of the invention is to embody the heating surfaces of the steam generator in such a way as to prevent the continuous build-up of deposits in the form of slagging, and the disadvantages associated therewith, in the area through which the flue gases pass. To achieve this, the heating surface tubes are surrounded by protective sleeves which rest loosely on the surface of the heating surface tubes between the mountings thereof. The ends of the protective sleeves exhibit an expansion distance to the mountings of the heating surface tubes. The heat expansion coefficient of the material forming the protective sleeves is higher than that of the material forming the heating surface tubes.