Verfahren zum thermischen Behandeln von Fluessigkeiten, Loesungen, Schlamm oder Feststoffen, die vergasbare oder verdampfbare Bestandteile enthalten

摘要

Finely divided particles such as droplets of aqueous solution or particles of bark are dried by passage through the heated zone of a vertical vessel closed at the top and having an outlet at the bottom, the particles being heated by radiation and being supplied at such a rate that the steam evolved flows towards the outlet and entrains the particles of substantially the velocity of the flow to expose them to heat treatment for substantially identical times. As shown, the particles are supplied by a suitable device 220 to the top of a vertical tube 218 heated by a suitable medium such as hot gases admitted at 228 and emerging at 230. The particles are heated by radiation to evolve steam which flows downwards and in which the particles are entrained when carried past the heated zone 232. A gas such as air may be admitted at 264 to the partially heat-treated mixture of particles and steam, for example to produce calcination. The final product may be drawn off at outlet 222, the solid particles being separated by a cyclone 236 and the steam passing to a heat exchanger 242. The inlet 264 may be omitted, the whole of the vessel 218 being heated by a single heating jacket.