4 replies to this topic

[Dazzler]

Hi All
I'm interested in some simple design criteria that I could use to check if a proposed higher solids feed rate in future into an existing dilute phase pressure pneumatic conveying system will be ok.

I've found typcial carrying velocities, but I would like to know typical solids-to-gas ratio for various materials, including salts and crystaline inorganic chemicals.

Thanks in advance,
Dazzler

[breizh]

Hi Dazzler ,
Consider this resource ,it might helps .

Breizh

[Dazzler]

Thanks Breizh,
This reference from PDH seems to indicate that for dilute phase pneumatic conveying of solids that the solids/air ratio be less than 0.5 wt/wt.
I have found another reference that indicates that relatively speaking, for centrifugal blowers the ratio would be lower than when PD blowers or multistage centrifugal blowers are used.
Dazzler.

[breizh]

Let you get a copy of Bulk solid handling by Don Macglinchey -blackwell publishing .

it should support as Perry's handbook should do

Breizh

[Steve Hall]

Dazzler,

There is no simple rule of thumb that answers your question. This is because the performance of a dilute phase conveyor depends on many factors such as: particle density, particle diameter, gas density, pipe diameter, pipe length, and pipe inclination.

However, you may get an indication if you can calculate the Saltation velocity using the Rizk equation. See attached pages from my book, Rules of Thumb for Chemical Engineers, 5th Edition.

Steve

Attached Files

•  Saltation - from Rules of Thumb Chem Engineers 5th Edition.pdf   180.65KB   106 downloads