2022 Volume 48 Issue 1 Pages 69-78
The purpose of this study is to evaluate the self-heating for the carbonized woody biomass, and to provide the essential information on storage management to contribute to the realization of co-firing at pulverized coal power station. In this study, the authors conducted two kinds of experiments for self-heating characteristics. (1) As a result of the isothermal self-heating experiment, the amount of heat generation was higher than that of bituminous coal and lower than that of subbituminous coal. It was found that there was little change in the self-heating property for consolidation of the samples. (2) As a result of the adiabatic experiment simulating storage in a silo, the temperature rising rate of carbonized woody biomass was about 1.2 to 2 times higher than that of bituminous coal, but about half that of subbituminous coal. The storage time of carbonized woody biomass can be referred/grasped from that of bituminous coal and subbituminous coal in the actual operation of the power plant. Since the rate of temperature rise due to self-heating tends to increase as the amount of fixed carbon increases, fixed carbon is an important control index when relatively evaluating self-heating.
