Abstract
On the combustion of charcoal which is important for heat treatment of steels, such as carburizing bright annealing, was investigated under various condition.
The results obtained are as follows : At any temperature, the oxidation of charcoal by air proceded rapidly, but reduction of produced gas in charcoal layer was gradual. Psedo-equilibrium state was easily reached at high temperature. The difference in behavior of combustion of charcoal layer comprising different particles was due to the velocity of gas flows passing through charcoal layer and also the effective area of the particles. Most of salts of Na, Ba and Ca are effective catalytically in the combustion of charcoal, but not Na2B4O7 and Na3PO4. Mg salts are slightly, Al2O3 and SiO2 are negatively and oxides of Fe, Co, Ni, Mn and Cr are not effective.
