Measurement of Permeability for a Packed Bed of Coal During Carbonization Process

Abstract

Permeability of a packed bed of coal and coke, which is very impor-tant property for the analysis of pyrolyzed gas flow behavior within the packed bed or porous media, is measured in the room temperature after the carbonization process. Below the softening temperature (Tsf), the packed bed of coals is heated up in the vessel which is made to be able to set directly in the measurement section. On the other hand, a semicoke which is produced by heating up to an arbitrary temperature over T_sf, in the vessel is cut off to a length of 2cm, its side is coated with a thermosetting resin and then the coke is fixed in the test section. Permeability for a packed bed of every coals is increased gradually with the carbonization temperature below Tsf and decreased drastically near T_sf being the minimum value. The tendency has no relation to the coal type and the heating rate. Over Tsf, permeability of Saraji coal (V.M.=18.6%) is once increased and then decreased with an in-crease of temperature having the maximum value at 930K. In case of Gregg River coal (23.8%) permeability is increasing up to 1100K.