Re: Design Problem
Originally posted by controldesign
Hello,
I hope you find this an appropriate post for your forum. A reader has a question we've had trouble finding answers to. We don't want a product "plug", rather some suggestions about the appropriate technology application:
The reader writes:
"How Do We Measure Velocity of Fragile Solids?
We do control systems for pneumatic conveying systems. An upcoming project involves conveying very friable materials in a system designed to minimize particle denigration [degradation?]. We need to measure material velocity and flow rate at several key positions to ensure material isn't building up. System pressure doesn't tell us enough. I'm not sure we can put a probe inside the 2-in. stainless tube. Any suggestions for an internal or external
solution?"
You can reply here, or send it to CDTHeAnswer@putman.net.
Thanksvm
Joe Feeley
What you are dealing with is velocity of the air stream versus the weight of the material being moved.
You will need to blow a set amount of material in your system using the dilute phase of conveying the solids to measure time spent in the system from point to point-you can not overcome physics.
The only way you will reduce the degradation of material is using the dilute phase of blower movement of material. ■
Particle Velocity
It should be a straight forward application if it is research project.
about 26 years ago. this had been a interseting research topic for most. The various methods are
1Tracer technique. tag the partcles(based on the size if required) by
Dye
Radio active tracer
Anlyse the output to study residence time detsribution.
This was also done to study size reduction in ball mills
2 Or also assume a RTD pattern and correlate with other factors such as pressure drop or temeperature pattern or moisture or, reaction etc.
3..Photographic techniques: I think Warren Springs at Harwel had done this ■
Re: Design Problem
Simple enough.
use a strobe , and a camera .
either install a transparent section or at the discharge.
the second option use a lazer dopler velocimeter . they work with the dopler shift , and meanwhile you have a clear sight path to the particle in question it will work fine.
marco ■
Design problem
Hello,
I hope you find this an appropriate post for your forum. A reader has a question we've had trouble finding answers to. We don't want a product "plug", rather some suggestions about the appropriate technology application:
The reader writes:
"How Do We Measure Velocity of Fragile Solids?
We do control systems for pneumatic conveying systems. An upcoming project involves conveying very friable materials in a system designed to minimize particle denigration [degradation?]. We need to measure material velocity and flow rate at several key positions to ensure material isn't building up. System pressure doesn't tell us enough. I'm not sure we can put a probe inside the 2-in. stainless tube. Any suggestions for an internal or external
solution?"
You can reply here, or send it to CDTHeAnswer@putman.net.
Thanksvm
Joe Feeley ■