Chemical Engineering November 2014 - 62

Solids Processing
3
Round outlet
2
1
Slotted outlet
FIGURE 9. Improved gas uniformity can be achieved by injecting
gas via crossbeams and an annulus, such as those
shown here
15
�'
FIGURE 8. The function H (') is used ito calculate the outlet
dimensions that will prevent arching in mass flow hoppers
through the material top surface.
If the permeability and the compressibility
(that is, the bulk den30
45
s
i t y - pr es sur e
relationship)
of the powder
are known, the
pressure gradient
can be calculated
by an
analysis given by Ref. 4. The permeability
of a powder is determined by
passing air through a bed of volume
and measuring the resultant
pressure drop.
Gas distribution
With direct bulk-solids coolers that
operate in counterflow mode, the
gas must be distributed evenly
throughout the moving bed of solids.
Mass flow is essential, otherwise,
stagnant material - with a
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62 ChemiCal engineering www.Chemengonline.Com noVemBer 2014
H (�')

http://WWW.LOADCONTROLS.COM http://adlinks.che.com/50982-20 http://www.Chemengonline.Com

Chemical Engineering November 2014

Table of Contents for the Digital Edition of Chemical Engineering November 2014

Contents
Chemical Engineering November 2014 - Cover1
Chemical Engineering November 2014 - Cover2
Chemical Engineering November 2014 - Contents
Chemical Engineering November 2014 - 2
Chemical Engineering November 2014 - 3
Chemical Engineering November 2014 - 4
Chemical Engineering November 2014 - 5
Chemical Engineering November 2014 - 6
Chemical Engineering November 2014 - 7
Chemical Engineering November 2014 - 8
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Chemical Engineering November 2014 - Cover3
Chemical Engineering November 2014 - Cover4
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