Book contents
- Frontmatter
- Contents
- Preface
- Part I Basic Relationships
- Part II System Characteristics
- 7 Gas–Solid Separation
- 8 Hopper and Standpipe Flows
- 9 Dense-Phase Fluidized Beds
- 10 Circulating Fluidized Beds
- 11 Pneumatic Conveying of Solids
- 12 Heat and Mass Transfer Phenomena in Fluidization Systems
- Appendix: Summary of Scalar, Vector, and Tensor Notation
- Index
11 - Pneumatic Conveying of Solids
from Part II - System Characteristics
Published online by Cambridge University Press: 27 October 2009
- Frontmatter
- Contents
- Preface
- Part I Basic Relationships
- Part II System Characteristics
- 7 Gas–Solid Separation
- 8 Hopper and Standpipe Flows
- 9 Dense-Phase Fluidized Beds
- 10 Circulating Fluidized Beds
- 11 Pneumatic Conveying of Solids
- 12 Heat and Mass Transfer Phenomena in Fluidization Systems
- Appendix: Summary of Scalar, Vector, and Tensor Notation
- Index
Summary
Introduction
In solids processing systems, it is commonly required to transport solids from one location to another. Solids can be transported via various means, including (1) pneumatic conveying, in which solids are transported in a pipe or channel by gas flow through blowing or suction; (2) gravity chutes, where solids transport downward by gravitational force; (3) air slides, where solids, partially suspended in a channel by the upward flow of air through a porous wall, flow at a small angle to the horizontal; (4) belt conveyors, where solids are conveyed horizontally, or at small angles to the horizontal, on a continuous moving belt; (5) screw conveyors, in which solids are transported in a pipe or channel by a rotating helical impeller; (6) bucket elevators, in which solids are carried upward in buckets attached to a continuously moving vertical belt; and (7) vibratory conveyors, where solids flow is activated by jigging action provided by angled spring supports.
This chapter focuses on pneumatic conveying as the means for solids transport. Examples of solid materials that are commonly transported via pneumatic conveying are flour, granular chemicals, lime, soda ash, plastic chips, coal, gunpowder pellets, ores, and grains [Stoess, 1983; Williams, 1983; Konrad, 1986; Soo, 1990; Marcus et al., 1990]. Materials to be conveyed are usually dry and readily free-flowing. Some sluggish and damp materials can also be free-flowing with proper aeration. The advantages of pneumatic conveying include extreme flexibility in routing and spacing, safe working conditions, and low maintenance cost.
- Type
- Chapter
- Information
- Principles of Gas-Solid Flows , pp. 461 - 498Publisher: Cambridge University PressPrint publication year: 1998