Dilute Rate
Your post did not state the reason for wanting to change the system to dilute-phase. It must be compelling, for if indeed you can reliably get 120,000 lb/hr through the existing 4" system in dense-phase, I can list several reasons why you may want to reconsider the change.
1) The dust conveying rate will be reduced in dilute-phase, i.e. expect the solids loading ratio (lb of solid / lb of air) to be reduced by a factor of, say, 10.
2) The conveying air flow requirement will increase by a factor of approximately 2.0. You might have to install a new blower or air compressor.
3) Doubling the conveying air flow may well mean that the end-of-the-line filters are undersized. These may have to be replaced.
These are my thoughts.
Dennis Hauch PE ■
Re: Material Flow Rate For Dense Phase System
I agree wholeheartedly with Dennis on this one. To convert to dilute phase suspension flow you will need approximately three times the air flow rate. This then equates to three times the power and three times the size of the reception filter unit. The new material flow rate will be about one-third at 40,000 lb/h. If the material is abrasive you will have twelve time the erosive wear rate to contend with. Do you have any compelling advantages on the plus side? ■
Material flow rate for Dense Phase System
Want to replace a Dense Phase System with a Dilute Phase System for transporting dust.
Considering the following information for the current Dense Phase System:
Bore pipeline: 4-inch
Conveying line pressure: 30-psig
Free air flow rate: 210-cfm (cubic feet per minute)
It will give a correspoing material flow rate : 120 lb/h x 1000 (Dense)
Therefore, after the Dense Phase is replaced with a Dilute Phase, what will the material flow rate be? (Dilute)
Can some one please answer my question?
Thanks a lot! ■