Dust Extraction and Handling in the Wood Industry

Description

This book examines a topic which is an indispensable part of any production line in the wood industry: the extraction, separation, handling of dust and chips, ensuring clean air in the workrooms, and avoiding health, fire and explosion risks. All scientific backgrounds of these problems are not fully known today, and efforts should be made to fill this gap. The work contains significant new derivations and calculation methods and experimental results to support design and evaluation methods such as particle size distributions depending on wood species and machining, terminal velocity of small wood particles, aerodynamics of suction hoods, a detailed analysis of particle separation in cyclones, selection and evaluation of separation efficiency for appropriate filter selection, energy consumption and transportation efficiency of pneumatic conveying, a comprehensive theory of transport ventilators. Several new details of dust explosion are also included. The calculation methods, practical solutions and recommendations are supported by physically well-established explanations providing long-lasting knowledge. Preface Introduction References Contents 1 Physical Properties of Dust and Chips 1.1 Origin of Dust and Chips 1.2 Particle Size Distribution 1.3 Effect of Machining and Wood Species 1.4 Friction Coefficient 1.5 Side Pressure on Vertical Wall 1.6 Terminal Velocity 1.7 Particle Motion in Air Stream References 2 Behavior of Dust and Chips in Bulk 2.1 State Diagram of Loose Granular Bulk Materials 2.2 Stress State of Granular Bulk Materials 2.3 Flow Properties of Bulk Materials 2.4 Compaction of Bulk Material References 3 Dust and Chip Collection 3.1 Aerodynamics of Suction Devices 3.2 Dust Collectors on Woodworking Machines References 4 Pneumatic Conveying 4.1 State Diagram for Pneumatic Transport 4.2 Operational Characteristics 4.3 Resistance to Airflow 4.4 Resistance of Material Transportation 4.4.1 Resistance Due to Impact 4.4.2 Resistance Due to Friction 4.4.3 Other Resistance Components of the System 4.5 Energy Consumption and Efficiency References 5 Separation of Particles from the Airflow 5.1 Principles of Dust Separation 5.2 Separation Efficiency 5.3 An Analysis of Fractional Separation Efficiency 5.4 Air Recirculation References 6 Auxiliary Equipments 6.1 Ventilators 6.2 Feeding Devices 6.3 Layout of Conveying System References 7 Health and Safety 7.1 Health Hazards of Wood Dust 7.2 Fire and Explosion Protection References 8 System Optimization 8.1 Methods of Optimization 8.2 Characteristic Features of Optimization in Dust Extraction and Handling References Index