GB191319924A - Method of and Means for Drying Liquids, Damp Substances, and the like. - Google Patents

Abstract

19,924. T÷pfer, M., and M³ller, P. Sept. 3. Spray evaporators. - Liquids, damp substances, &c. are sprayed in a finely-divided condition in a chamber or passage, so as to form a flat layer of mist which is projected between two layers of drying-medium occupying almost the width of the chamber and moving closely above and below and parallel or slightly convergent on the layer and in the same direction; the process may be carried out at about 40‹ C. In the apparatus shown in Fig. 1, liquid from a tank 2 is supplied to a nozzle 3 through which it is sprayed by atomizing-medium, for example compressed air, supplied through a pipe 6. Drying - medium, for example air, is directed through nozzles 7 and, when exhausted, passes out through flues 12. The dried particles are carried by a belt 9 to a receptacle 11, into which they are directed by a scraper 10. Alternatively, a rotary centrally - arranged atomizer may be used, the material being removed by a rotary plate and a scraper. In the apparatus shown in Fig. 3, liquid trickles down a corrugated or smooth inclined or vertical wall, and air is blown through perforations or a slit in a pipe 18, whereby the liquid is driven in a layer through a slit in the chamber wall. Any escaping liquid is collected in a vessel 23 and may be returned to the supply vessel. In place of a pipe 18, a feed-chamber may be formed, as shown in Fig. 6, by plates 24 behind the corrugated wall. A feed-device may also be formed of a pair of walls 16, Fig. 9, forming a closed pipe or chest 27 at the bottom, through which air is driven. The liquid to be atomized may be sterilized or otherwise treated. For example, milk may be sterilized by the use of a source 29, Fig. 6, of ultra-violet rays. The wall down which the liquid flows may be placed in communication with different liquids, one or other of which may be allowed to flow as desired.