Re: Pick Up Velocity
Pick up velocities are calculated at solid feed point. This point has the maximum conveying line pressure and lowest air velocity. ■
Re: Pick Up Velocity
Dear Mr giraldo,
The pick-up velocity is the air velocity at the location where the material-air mixture is formed.
Normally this is at the intake of the system, f.i. under a rotary lock.
The velocity at the intake of the blower is not important for the pneumatic conveying calculation. (there is no material there)
BUT, you should consider the air velocity at any location in the pipeline.
As the air expands along the pipeline, the velocity increases, if the pipeline diameter si kept constant.
If the air velocity becomes too high, the pipeline diameter can be increased (Stepped pipeline)
The air velocity at any location in the pipeline must be sufficiently above the local suspension velocity of the material, to prevent sedimentation, but low enough to prevent damaging the particles or using excessive energy.
This is the case for pressure conveying as well as vacuum conveying.
Best regards
teus ■
Teus
Thanks
Thanks a lot Mantoo
Originally posted by Mantoo
Pick up velocities are calculated at solid feed point. This point has the maximum conveying line pressure and lowest air velocity.
■
Thanks
So I have to find an operation point which assure that I overcome the minimal velocity of sedimentation not expending too much energy, nor damaging the particles or the pipes and equipment... Am I right ?
Thanks for your help
Originally posted by Teus Tuinenburg
Dear Mr giraldo,
The pick-up velocity is the air velocity at the location where the material-air mixture is formed.
Normally this is at the intake of the system, f.i. under a rotary lock.
The velocity at the intake of the blower is not important for the pneumatic conveying calculation. (there is no material there)
BUT, you should consider the air velocity at any location in the pipeline.
As the air expands along the pipeline, the velocity increases, if the pipeline diameter si kept constant.
If the air velocity becomes too high, the pipeline diameter can be increased (Stepped pipeline)
The air velocity at any location in the pipeline must be sufficiently above the local suspension velocity of the material, to prevent sedimentation, but low enough to prevent damaging the particles or using excessive energy.
This is the case for pressure conveying as well as vacuum conveying.
Best regards
teus
■
Pick up velocity
Dear all
I'd like to know when I perform calculations, I should consider the pick-up velocity at which point:
1. At the inlet of the system ?
2. At the inlet of the blower ?
3. At the rotary valve feeder ?
4. At the end of the line ?
Thanks in advance
Daniel Giraldo ■