Chapter 20: Pneumatic Conveying

20.1 Introduction 3
20.1.1 Related important references 4
20.2 Codes and Standards 4
20.3 Equipment comparison 4
20.4 Product grouping 5
20.4.1 Group I 5
20.4.2 Group II 5
20.5 Fluidization Characteristics 7
20.5.1 Flow Function 7
20.5.2 Important Flow Features 7
20.5.2.1 Factors influencing flow 7
20.6 Conveyors 7
20.6.1 Selection of mechanical conveyors 8
20.6.1.1 Belt conveyors 8
20.6.1.2 Screw conveyors 9
20.6.1.3 Pneumatic conveyors 10
20.7 Factors for Design and Use 17
20.7.1 Other Parameters involved in selection 22
20.7.1.1 Duty Requirement 22
20.7.1.2 Material Container and Pickup Point 22
20.7.1.3 Process Equipment 22
20.7.1.4 Headroom 22
20.7.1.5 Plant Site and Industry Environment 23
20.8 Pneumatic Conveying systems 24
20.8.1 Vacuum system 24
20.8.2 Pressure Mode 29
20.8.3 High Pressure Mode 29
20.8.4 Pneumatic Conveying System – Dilute versus Dense Phase 32
20.8.4.1 Lean Phase or Dilute Phase Conveying 35
20.8.4.2 Dense Phase Conveying System 37
20.9 Few recommended pneumatic conveying system configurations 41
20.10 Pneumatic conveying system components 56
20.11 Typical Calculation for Pneumatic Conveying 68
20.11.1 Estimating Pressure Drop in Dilute Phase Conveying System 68
20.12 Steps in System Design 74
20.12.1 Example of dilute phase sizing 74
20.13 References 78

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