Air Flow for Dense Phase Conveying System
Air Flow for Dense Phase Conveying System
(OP)
Hi,
I have 2 pellet lines utilizing dense phase positive-pressure conveying systems. Both lines have the same conveying distance.
Line 1:
Products: 95% are surface lubricated
Conveying line geometry: after exiting from RV, the 4" pipeline travels horizontally for 10 metres before making a vertical upward 90deg turn (approx 1m radius)
An approx plan view is below: "O" means out of paper
(RV)xxxxxxO
Air flow rate: 100 m3/hr to maintain conveying pressure of about 1 bar at the air supply side
Line 2:
Products: 50% are surface lubricated
Conveying line geometry: after exiting from RV, the 4" pipeline travels horizontally for 8 metres, then makes a horizontal 90deg turn (approx 1m radius), then travels approx 30cm before making a vertical upward 90deg turn (approx 1m radius). The downstream thereafter is the same as Line 1.
An approx plan view is below: "O" means out of paper
(RV)xxxx
x
x
x
x
O
Air flow rate: 150~200 m3/hr to maintain conveying pressure of about 1 bar at the air supply
My question is: Given the same pellet loading, why does Line 2 need more air flow than Line 1?
I'm trying to rationalize along the factors of
a) Product mix (only 50% surface lubricated in Line 2)
b) Conveying line geometry.
Is this correct and/or are there any other factors that I should look into?
Many thanks.
I have 2 pellet lines utilizing dense phase positive-pressure conveying systems. Both lines have the same conveying distance.
Line 1:
Products: 95% are surface lubricated
Conveying line geometry: after exiting from RV, the 4" pipeline travels horizontally for 10 metres before making a vertical upward 90deg turn (approx 1m radius)
An approx plan view is below: "O" means out of paper
(RV)xxxxxxO
Air flow rate: 100 m3/hr to maintain conveying pressure of about 1 bar at the air supply side
Line 2:
Products: 50% are surface lubricated
Conveying line geometry: after exiting from RV, the 4" pipeline travels horizontally for 8 metres, then makes a horizontal 90deg turn (approx 1m radius), then travels approx 30cm before making a vertical upward 90deg turn (approx 1m radius). The downstream thereafter is the same as Line 1.
An approx plan view is below: "O" means out of paper
(RV)xxxx
x
x
x
x
O
Air flow rate: 150~200 m3/hr to maintain conveying pressure of about 1 bar at the air supply
My question is: Given the same pellet loading, why does Line 2 need more air flow than Line 1?
I'm trying to rationalize along the factors of
a) Product mix (only 50% surface lubricated in Line 2)
b) Conveying line geometry.
Is this correct and/or are there any other factors that I should look into?
Many thanks.





RE: Air Flow for Dense Phase Conveying System
The additional 90deg turn itself should hardly increase the pressure drop to such extent, but there could be large scales there due to some local back flow in it.
m777182