Page 10 - Advanced Mine Ventilation

Contents ix

8 Characteristics of Respirable Coal Dust Particles 105
8.1 Settling Velocity of Small Particles Due to Gravity
(Stoke’s Formula) 106
8.2 Aerodynamic Shape Factor for Dust Particles 109
8.3 NonSettling Fraction of Respirable Dust 110
8.4 Size Distribution of Respirable Dust Particles 112
8.5 Determination of Mass Distribution for Fine Coal Dust Particles 116
8.6 Chemical Composition of Respirable Coal Dust 119
References 122

9 Generation of Respirable Coal Dust 123
9.1 A Mathematical Model for Respirable Dust Generation 124
9.2 Sample Preparation and Experimental Details 125
9.3 Yield of Respirable Dust 128
9.4 Dependence of Respirable Dust Index on the Properties of Coal 130
9.5 Statistical Analysis of Data 133
9.6 Results of Similar, Subsequent Studies 134
9.7 Impact of Cutting Bit Wear on Respirable Dust Production 135
References 136

10 Respirable Dust Control 137
10.1 Theory of Dust Suppression and Collection 138
10.2 Collection of Dust Particles by Filters 141
10.3 Dust Control in Continuous Miner Section 142
10.4 Dust Control in Longwall Faces 145
10.5 Dust Control for Roof Bolters 147
10.6 Personal Protective Equipment 147
10.7 Optimization of Water Sprays 148
10.8 Use of Surfactant to Improve Dust Control 149
10.9 Electrostatic Charging of Water Particles for Improved Dust
Collection 150
References 155

11 Diesel Exhaust Control 157
11.1 Health Hazards of Diesel Particulate Matter 158
11.2 Diesel Particulate Matter Standards 159
11.3 Diesel Exhaust Control Strategy 161
11.4 Diesel Exhaust Dilution 167
11.5 Diesel Equipment Maintenance and Training of Personnel 182
11.6 West Virginia Diesel RegulationsdA Model for Coal Industry 183
References 186

12 Respirable Dust Sampling and Measurement 189
12.1 Early Dust Measuring Instruments 190
12.2 Gravimetric Personal Dust Samplers 192