FREMGANGSMAATE FOR UTFOERELSE AV VARMEKREVENDE KJEMISKE OG/ELLER FYSIKALSKE PROSESSER

摘要

A material layer, e.g. a coke bed (14), having a resistivity of from 10<-4> to 10 ohm.m is heated in a reactor chamber by means of an induction coil (12) arranged outside the reactor chamber. The heating is produced by an induction current in the coke bed (14) itself, the current being generated by a low-frequency alternating current whose frequency corresponds to at most 10 times the mains frequency being passed through the induction coil (12). A ratio is maintained of from 0.2 to 2.5 between the smallest bed cross-section (d) and the penetration depth ( delta ) of the inductive field, said ratio being defined by the equation d DIVIDED delta =k(0.54 - 0.35 . <10>log rho ), where k is a number between 1.1 and 1.5 and rho represents the resistivity of the material layer, e.g. the coke bed. The method can be employed, for example, in the coking of coal, in the production of carbide, in the reduction of metal oxides, especially iron oxides, with coke, or in the smelting of scrap metal.