Abstract: The support girders of the heat exchanger are connected at the ends to a tension band on an adjacent wall by a connection with transfers stress in a symmetric manner. A connecting element is welded to a tension band in a symmetric manner and carries pivot links which, in turn, are articulated to the end of a girder. Loads from the girder are transferred to the tension band in the central plane of the tension band.

Abstract: The heat exchanger has a cover which is formed by parallel groups of terminal tubes which connect with at least 80% of the wall tubes of the flue. In one embodiment, the terminal tubes of adjacent groups meet in a common zone and extend upwardly into a common header. In another embodiment, the terminal tubes of alternating groups are disposed in different layers with one layer covering over open triangular areas defined between adjacent tube groups of the other layer.

Abstract: The medium-carrying tubes of the vertical gas flue are bent outwardly of the boundary walls at the transverse gas flue and extend upwardly through the transverse gas flue in parallel groups. The medium-carrying tubes of the transverse gas flue are bent at the branch-off points of the vertical gas flue to fill the space in the planes of the vertical boundary walls left by the bent out tubes of the vertical flue and extend horizontally to common headers. The medium-carrying tubes of the vertical flue which pass through the transverse flue permit a uniform distribution of the temperature of the medium to be obtained at the outlet ends of the tubes.