MICROWAVE DRYING OF MOIST COALS

Physical principles and examples of practical implementation of drying large bodies of coal by microwave radiation are
considered. It is shown that energy consumption in microwave drying of brown coals decreases to 1.5–1.8 (kW·h)/ kg
as compared with traditional types of drying, for which the expenditures of energy amount to 3.0 (kW·h)/kg. In using
microwave drying, the technological time of drying decreases to 4 h, whereas the time of convective drying, with
other things being equal, comes to 8–20 h. Parallel with microwave radiation drying, grinding of a fuel takes place,
as well as entrainment of such toxic and ecologically harmful elements as mercury, chlorine, phosphorus, sulfur, and
nitrogen. An analysis of the prospects of using a microwave energy for drying coal fuel has shown that microwave
radiation makes it possible to considerably economize in energy, increase explosional safety, improve the ecological
situation, and reduce the metal content and overall dimensions of the equipment.
   
Author:  Vl. V. Salomatov, V. A. Karelin, S. O. Sladkov, and Vas. V. Salomatov
Keywords:  coal, microwave radiation, drying, dispersion, dielectric heating
Page:  497