Abstract
Bath movement in two kinds of coal gasifier filled with molten iron was studied by a tracer response method. One is an LD converter type and the other is a cylinder placed in horizontal.
Bath movement in a cylindrical vessel placed in horizontal was more irregular than that of LD converter. Two kinds of time averaged recirculations were observed in a region of larger amount of liquid for the lance placed at the position of 3 : 1 division of the length of a vessel. This phenomenon was dependent on the ratio of diameter to length of a vessel.
The relation between mixing time and energy density of agitation was described byτ∝ε-O.52, which was different from the conventional behavior observed in LD converter, where τ is mixing time and ε is energy density of agitation. The difference of the mechanism of energy dissipation was considered from dimensional analysis.
An addition of liquid paraffin as pseudo slag in LD converter resulted in the remarkable decrease in the flow velocity near the wall. Beyond a critical thickness of pseudo slag, the direction of flow near the wall has reversed from the bottom of the vessel to the surface. With an increase in the thickness of pseudo slag, a considerable prolongation of mixing time was observed. The phenomenon agreed well with a mathe matical simulation under the presence of pseudo slag.
