Heat exchanger - concentric tube arrangement provides anuli of optimum crossectional areas for both the heat transfering an

摘要

A tubular heat-exchanger comprising a jacket with a number of parts and a number of horizontal tube plates, through which a multitude of tube bundles are passed vertically, each tube bundle consisting of an external tube with both ends open and a concentric inner tube forming an annular opening for a first medium. The inner tube with an upper open and a lower closed end. accommodates a further concentric tube with both ends open, thus the tube is passed sideways through the wall of the inner tube, providing over its remaining length an annulus for a second medium. Both first-and second concentric tube carry distance pieces, which are used as scrapers during tube removal operations. The relative small crossectional area between the individual tubes improved the overall heat transfer. efficiency.