Page 20 - Advanced Mine Ventilation

Underground Coal Mine 1

Atmosphere

Chapter Outline

1.1 Introduction to Coal Mining 4
1.2 Underground Mine Atmosphere 5
1.3 Properties of Air 6
1.3.1 Gas Laws Related to Air 8
1.3.1.1 Boyle’s Law 8
1.3.1.2 Charles’ Law 8
1.3.1.3 Dalton’s Law of Partial Pressure 8
1.3.1.4 Graham’s Law of Diffusion 9
1.3.1.5 Air Density at Higher Altitude 9
1.3.1.6 Pressure Versus Fluid Head 10
1.4 Pollutant Control Strategy 10
1.5 Enforcement of Ventilation Standards 11
1.5.1 Mine Ventilation Regulations 11
1.5.1.1 US Federal Regulations 11
1.5.2 Maximum Concentration of Explosive Gases in Coal Mine Air 12
1.5.3 Some Highlights of Code of Federal Regulations 30, Parts 70 and 75 12
1.5.3.1 Respirable Dust Measurement 12
1.5.3.2 Methane Measurements 13
1.5.3.3 Minimum Air Requirements 13
1.5.3.4 Permissible Electrical/Diesel Equipment 13
1.6 Definition of Air (Gas) Properties 13
1.6.1 Atomic Weight 13
1.6.2 Avogadro’s Number 14
1.6.3 British Thermal Unit 14
1.6.4 Critical Temperature and Pressure 14
1.6.5 Density 14
1.6.6 Dew Point 14
1.6.7 Enthalpy or Heat Content 14
1.6.8 Entropy 14
1.6.9 Mole Volume 15
1.6.10 Relative Humidity 15
1.6.11 Specific Heat 15
1.6.12 Viscosity 15
Problems 15
References 16

Advanced Mine Ventilation. https://doi.org/10.1016/B978-0-08-100457-9.00001-8
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