Rohrelement fuer Waermeaustauscher

摘要

1,120,199. Tubular heat exchangers; steam generators. H. VORKAUF. 25 March, 1966 [26 March, 1965; 29 March, 1965; 19 Jan., 1966], No. 13371/66. Headings F4A and F4S. A heat exchange tube unit comprises a vertical supply tube 1 between a distributer 2 and a collector 3, lower and upper shut-off or throttling devices 5, 51 incorporated in the supply tube, and sinuous tubes 4 connected to the supply tube at points below the lower shutoff device 5 and above the upper shut-off device 51, the portion 111 of the supply tube lying between the shut-off devices being supplied with heat-exchange fluid by a U-tube 41 by-passing the lower shut-off device 5 and the fluid being removed therefrom by a second U-tube 411 bypassing the upper shut-off device 51. An unheated return flow tube 611 is connected to the supply tube 1 just above the distributer 2 and above the upper shut-off device 51. The portion 111 of the supply tube between the shutoff devices may be included in the return flow tube, the U-tubes 41, 411 then being omitted (Fig. 3). The upper connection of the return flow tube to the supply tube may be between the upper shut-off device 51 and the upper connection of the innermost sinuous tube 4, or it may be above the upper connection of the outermost sinuous tube. The tube unit may be used in a steam generator.