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Table of Contents
Intro; Forewords; Preface; Acknowledgements; Contents; Chapter 1: Importance and Characteristics of Underground Mine Gas Explosions; 1.1 Mine Gas Explosion Accidents; 1.2 Recognition of Mine Gas Explosions Hazard in Underground Coal Mine; 1.2.1 Underground Working Faces; 1.2.2 Tunnels with Electrical Equipment; 1.2.3 Mine Gob Areas; 1.3 Complexities in Mine Gas Explosion; 1.4 Outline of This Book; References; Chapter 2: A Historical Review of Identifying and Mitigating Mine Gas Explosions; 2.1 Techniques to Analyze or Control the Sealed Mine Volume; 2.1.1 Theoretical Analysis Approach
2.1.2 Numerical Simulation2.1.3 Mine Seal Practices; 2.1.4 Pressure Chamber; 2.1.5 Positive Pressure Chamber; 2.2 Classical Methods for Determining Mine Gas Explosibility; 2.2.1 Tertiary Diagram; 2.2.2 Revised Le Charterlierś Method; 2.2.3 Maximum Allowable Oxygen (MAO) Analysis; 2.2.4 USBM Method; 2.2.5 Kukuczka Method; 2.2.6 Discussion; 2.3 Underground Mine Gas Explosion Prevention Techniques; 2.3.1 Rock Dusting; 2.3.2 Stonedust and Water Barriers; 2.3.3 Water Mist Curtain; 2.3.4 Closed Vacuum Chamber; 2.3.5 ExploSpot Active Suppression System; 2.3.6 Porous Medium Materials
2.3.7 Suppression Powders2.3.8 Discussion; References; Chapter 3: Modelling Mine Atmosphere in a Sealed Coal Mine Volume; 3.1 Factors Controlling the Mine Atmospheric Compositions; 3.1.1 Barometric Pressure Change; 3.1.2 Coal Mine Seals; 3.1.3 Gas Compositions in a Sealed Mine Volume; 3.2 Coal Mine Sealed Atmosphere Modeling; 3.3 Mathematical Model Approach; 3.3.1 Control Volume Approach; 3.3.2 Ideal Gas Law; 3.3.3 Mathematical Derivation; 3.3.4 Discussion of Model Assumptions; 3.3.5 Parameter Estimates; 3.3.6 Verification Case Study; 3.3.6.1 Background Information
3.3.6.2 Simulation Strategy3.3.6.3 Results Comparison; 3.4 Physical and Numerical Modelling Approach; 3.4.1 Physical Modelling; 3.4.2 Physical Simulation Experiments; 3.4.2.1 Physical Model Frame and Similarity Ratios; Rock Strata Similarity; Ventilation Flow Field Similarity; 3.4.2.2 Model Description; 3.4.2.3 Experimental Plans; 3.4.2.4 Results and Discussions; Gas Distribution Within the Gob; Gas Distribution Within Overlying Strata; 3.4.3 Numerical Modelling; 3.4.3.1 Numerical Model and Validation; Selection of Model; Mathematical Model; Numerical Model and Boundary Conditions
Numerical Results in the GobValidation of Number Results; 3.4.3.2 Ventilation Conditions; Out-Flow Rate of Methane; Ventilation Rate at Working Face; 3.4.4 Numerical Studies for Various Ventilation Systems; 3.4.4.1 Numerical Models and Boundary Conditions; 3.4.4.2 Methane Concentration in the Gob; W Type Ventilation System; U + L Type Ventilation System; Y Type Ventilation System; J Type Ventilation System; 3.4.4.3 Results and Discussions; References; Chapter 4: Improved Explosibility Diagram Method; 4.1 Gas Explosion; 4.2 The Coward Explosibility Diagram
2.1.2 Numerical Simulation2.1.3 Mine Seal Practices; 2.1.4 Pressure Chamber; 2.1.5 Positive Pressure Chamber; 2.2 Classical Methods for Determining Mine Gas Explosibility; 2.2.1 Tertiary Diagram; 2.2.2 Revised Le Charterlierś Method; 2.2.3 Maximum Allowable Oxygen (MAO) Analysis; 2.2.4 USBM Method; 2.2.5 Kukuczka Method; 2.2.6 Discussion; 2.3 Underground Mine Gas Explosion Prevention Techniques; 2.3.1 Rock Dusting; 2.3.2 Stonedust and Water Barriers; 2.3.3 Water Mist Curtain; 2.3.4 Closed Vacuum Chamber; 2.3.5 ExploSpot Active Suppression System; 2.3.6 Porous Medium Materials
2.3.7 Suppression Powders2.3.8 Discussion; References; Chapter 3: Modelling Mine Atmosphere in a Sealed Coal Mine Volume; 3.1 Factors Controlling the Mine Atmospheric Compositions; 3.1.1 Barometric Pressure Change; 3.1.2 Coal Mine Seals; 3.1.3 Gas Compositions in a Sealed Mine Volume; 3.2 Coal Mine Sealed Atmosphere Modeling; 3.3 Mathematical Model Approach; 3.3.1 Control Volume Approach; 3.3.2 Ideal Gas Law; 3.3.3 Mathematical Derivation; 3.3.4 Discussion of Model Assumptions; 3.3.5 Parameter Estimates; 3.3.6 Verification Case Study; 3.3.6.1 Background Information
3.3.6.2 Simulation Strategy3.3.6.3 Results Comparison; 3.4 Physical and Numerical Modelling Approach; 3.4.1 Physical Modelling; 3.4.2 Physical Simulation Experiments; 3.4.2.1 Physical Model Frame and Similarity Ratios; Rock Strata Similarity; Ventilation Flow Field Similarity; 3.4.2.2 Model Description; 3.4.2.3 Experimental Plans; 3.4.2.4 Results and Discussions; Gas Distribution Within the Gob; Gas Distribution Within Overlying Strata; 3.4.3 Numerical Modelling; 3.4.3.1 Numerical Model and Validation; Selection of Model; Mathematical Model; Numerical Model and Boundary Conditions
Numerical Results in the GobValidation of Number Results; 3.4.3.2 Ventilation Conditions; Out-Flow Rate of Methane; Ventilation Rate at Working Face; 3.4.4 Numerical Studies for Various Ventilation Systems; 3.4.4.1 Numerical Models and Boundary Conditions; 3.4.4.2 Methane Concentration in the Gob; W Type Ventilation System; U + L Type Ventilation System; Y Type Ventilation System; J Type Ventilation System; 3.4.4.3 Results and Discussions; References; Chapter 4: Improved Explosibility Diagram Method; 4.1 Gas Explosion; 4.2 The Coward Explosibility Diagram