Re: Conveying Of Abrasive Powder
Dear Alex,
50 micron and 4500 kg/m3 gives a suspension velocity of approx. 2.2 m/sec.
The air velocity at atmospheric conditions will be then approx. 9 m/sec.
If you opt for a low pressure, it will be a dilute phase system
If you opt for a dense phase system, it will be a higher pressure system.
You can choose between a vacuum system and a pressure system.
A vacuum system would give an easier feeding device with receiving filter separator(s).
A pressure system would require a pressure feeder and also receiving filter separator(s).
The used equipment relates very much to the abrasiveness of and flow properties of the material.
Consult suppliers, who have relevant and proven experience.
mit freundlichen Gruessen
teus ■
Teus
Type Of Conveying System
Alex,
Your answer depends upon the abrasive properties of the material. If it is only mildly abrasive, you could use a properly designed dilute phase system, but if it is highly abrasive, the best choice would be a very low velocity dense phase system such as booster type with primary and secondary air.
Regards,
Amrit Agarwal
Consulting Engineer
Pneumatic Conveying Consulting
Email: polypcc@aol.com
Ph and fax: 304 346 5125 ■
Re: Conveying Of Abrasive Powder
Thank you for your answers, today i will get more information about the properties. If i have any further questions, i'll post them here.
best regards
Alex. ■
Re: Conveying Of Abrasive Powder
A common transfer of light particals by pnaumatic transport is to use ducting and low pressure high volume material handling fans.
For feeding into the transport line I suggest Zeppelin's MDS rotary valves design for higher pressure differnetials.
For discharge points, Zeppelin's T series or Y series diverter valves.
All of these valves are air purged at the seals or bushings.
www.zeppelin.com
2.5 pounds/cuft - is this correct? This is basically dust handling. ■
Re: Conveying Of Abrasive Powder
Mr. Agarwal is very wise. Years ago I was give some similar wise advice...first, understand the material, second, understand the process, and only after 1 and 2, apply a technology. Based on your clues, a) heavy bulk density, and b) abrasive nature of the powder, then it would seem that a high pressure (low velocity) dense phase system would be more suitable. Don't make the mistake of assuming high pressure = high velocity. At high pressure, there is more stored energy per unit mass of air, and therefore less air is required to do the same work as compared to a low pressure system.
As for flow speeds, the minimum velocity in a dense phase system depends on the material properties, usually the particle shape. If your material is abrasive, then chances are the shape is not spherical. However, as Mr. Agarwal pointed out, a booster type system will provide advantages. The biggest advantage is velocity control, and more specifically, the ability to convey at lower velocities than without boosters.
As for diverters, our philosophy if the material is the same grade going to all destinations, is to pipe the system with valves at the destinations, and laterals at the branches, and run the system "Full Line Concept" (you can see more at http://www.dynamicair.com/systems/hdp4000.html). We would use this design for the most abrasive materials.
Good luck! ■
Airslide
we are manufacturer and exporter of Air Slide Fabrics used in pneumatic conveying.
mail us at safilterpltd@vsnl.com
Regds,
mayank ■
Abrasive Powder Handling
Hi,
I have attached a pdf presentation that might be of interest.
Regards,
Mike.
Attachments
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Fluidization Media
Porvair Filtration Group manufacturers two kinds of fluidization media used for pneumatic conveying.
For low temperature applications, sintered VYON(R) polyethylene media provides an economical means to fluidize and mobilize powder, and is more durable than many types of filter fabrics.
For high temperature or other challenging applications, Porvair Filtration Group offers its SINTERFLO(R) sintered porous metal materials. These cost-effective materials can be of sintered metal powder, or layers of metal filter screen which are sintered (permanently bonded) together. These rugged materials offer the abrasion, chemical and temperature resistance of the metal alloy from which they are made- 316L and many other alloys are available. Porosity is controlled to impart the required flow vs pressure profile and to prevent ingress of fine particles into the medium. The metal fluidization media can be made into flat panels, discs, cones and custom shapes, and are easy to mount.
For more information, visit the company's website at porvairfiltration.com .
Joseph ■
Re: Conveying Of Abrasive Powder
Dear Alex,
If you still require support with this particular application we would be pleased to support you with it. One of our Pneumatic Conveying technology experts could contact you to discuss further?
Our e-mail address is solutions@clydematerials.co.uk
Best regards,
Clyde Materials Handling
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Conveying of abrasive powder
Hello folks,
after lurking for some time i'd like to ask a question, regarding a project for a customer, who wants to move from bucket elevator to pneumatic conveying:
2 entry points (1 bigbag, 1 bunker)
5 exit points (4 bunker, 1 bigbag)
powder is abrasive, approx 50 micrometer d50, bulk density 2.5, particle 4.5, temperature approx 100 °C
What kind of conveying system would you recommend ?
At the moment, i'm prefering a low pressure, dense phase or plug flow system, because of the lower speed (lesser wear on pipes) and more exit points than entry points.
The length of the line is a maximum of 40 m (including approx. 10 m difference in height) from entry to exit.
Can you give me some advices or an approximate computation of flow speeds, pipe diameter and compressor ?
Are several Y-diverters or a single multi-port diverter the better choice ?
thank you very much and best regards
Alex. ■