PNEUMATIC CONVEYING AND CLEANING Chapter 14

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PNEUMATIC CONVEYINGAND CLEANINGChapter 14

• MARKKU J. LAMPINEN

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Contents of Chapter 14

• INTRODUCTION
• BASIC PRINCIPLES OF PNEUMATIC CONVEYING
• Concepts and Notations
• Classification of Different Types of Flow
• Mathematical Analysis of the Free-Falling
  Velocity
• Modelling Falling Velocity in a Tube
• Estimation of Transportation Velocity of Solid
  Particles
• in Pipe Flow at Various Inclination Angles
• An Empirical Approach for Calculating the
  Pressure Drop in Pneumatic Transport
• References

• NEW PRESSURE-LOSS EQUATION
• A Theoretical Approach for Calculating the
  Pressure Drop in Pneumatic Transport
• Some Further Considerations and Development of
  the Pressure Loss Equation
• Evaluation of the Pressure-Loss Parameters on the
  Basis of Measured Data
• Example of Calculating the Pressure Losses in a
  Pneumatic Conveying System
• Calculating the Pressure Loss of an Ejector in a
  Pneumatic Conveying System
• References
• CONCLUSIONS

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INTRODUCTION

• Conveying systems normally use air as the
  transport medium to convey granular, crushed, or
  pulverized materials.
• Modelling the flow of pneumatic conveying and
  calculating its pressure loss is a problematic
  task.

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INTRODUCTION

• The greatest problem arises from the fact that
  different mass flow ratios, solid flow rate
  divided by the gas flow rate, imply different
  flow types in pneumatic conveying.
• Each of these flow types, which can be classified
  in many different ways, requires its own specific
  model in order to provide a concrete calculation
  method.

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FIGURE 14.2 State diagram of pneumatic conveying.
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FIGURE 14.3 Distinct phases of pneumatic
conveying.
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FIGURE 14.7 Falling of a solid particle in a tube.
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FIGURE 14.9 Different flow patterns in vertical
transport.
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FIGURE 14.15 The friction forces affecting the
flowing gas-solid mixture.
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FIGURE 14.16 Numerical solution principle of Eq.
(14.126).
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FIGURE 14.19 A pneumatic conveying system.
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FIGURE 14.20 Ejector for flue gas with ash.