Heat-treating particles to harden them in continuous flow - by uniformly passing through tubes with closed walls and extending through chamber with inlet and outlet for steam or hot gas

摘要

The method is for heat treating hardenable particles (9), pref. in the form of a continuous flow, in a hardening space (1) by the action of a heating medium. The heating medium, e.g., steam or hot gas (in tube (5) with inlet (6) and outlet (7)), is sepd. from the particles by a closed wall (15). The particles are pref. uniformly distributed over a number of parallel spaces (tubes (1)) and, after passing through these, are subjected to final heat treatment in a heated (e.g. via tube (11) and/or tubes (10a)), pref. insulated (20) chamber (10). After passing through this chamber (10), heat may be recovered from the hardened particles (in (12)), e.g. by spraying (13) water thereon.