GB190720003A - Improvements in Apparatus for Condensing, Evaporating, Concentrating, Distilling, Heating and the like. - Google Patents

Abstract

20,003. Dunn, J., and Dunn, F. M. Sept. 7. Condensers; evaporators, - Relates to vacuum pans of the tubular type for the evaporation or concentration of liquids, or to be used for condensing, heating, and distilling purposes. In apparatus in which the liquid to be heated flows in thin films between pairs of concentric tubes which are heated by steam and are fitted in perforated partitions, an unrestricted return flow for the liquid is provided. In the arrangement shown in Fig. 1, the liquid flows from the chamber C<2> up the annular space between the concentric heating-tubes G, H, and returns by the large central circulating- pipe E. The outer tubes G are heated externally by steam in the chamber C<1>. The inner tubes H, which extend upwards from the steam chamber C<3>, may be closed at their upper ends, or they may have a small opening therein for the escape of non- condensible gases. In a modification, the upper ends of the inner tubes terminate in a steam dome which may be provided with a pipe to permit a free flow of steam. Fig. 3 shows an arrangement in which the inner steam pipes H extend from side chambers C<6> through outer pipes which traverse a steam chamber G.