Relationships Between Electrostatic Charging Characteristics, Moisture Content, and Airborne Dust Generation for Subbituminous and Bituminous Coals

摘要

Small scale laboratory pulverizing experiments were performed on humidified coal material sieved to size 6.35mm (O.250 in) and below to eliminate effects due to inherent planes of weakness (Cleats or joints). Experimental factors studied include the coal seam proximate analysis constituents, the breakage-induced electrostatic field of airborne dust, and the specific airborne dust generated. Results of these pulverizing experiments show that only coals below 1-2% air dry loss (ADL) moisture content are in a highly charged state after pulverization and that the amount of charging decreases rapidly with increasing ADL up to 1-2%.