Bucket elevators and en-masse conveyors are widely used to handle fly ash.

Fly ash can easily be fluidised which can create difficulties when handling it mechanically.

Question, why do you want your system overdesigned by 50%■

Dear ppquintal,

Dosing can be done with rpm control of the screw, whereby the screw is always 100% filled.

Dosing with a valve can result in irregular flow through the screw.

The airslide requires the extraction of the dusty fluidization air, requiring an appropriate filter assembly with fan. This is easier when the airslide is replaced by another screw.

Using a pneumatic system requires extensive dust control around the mixer bin.

Therefore, a pneumatic conveying system might not be the best choice.

Obviously, the lay out will depend on the local situation.

success

Teus ■

Dear ppquintal,

I read your thread also on the “Powder and Bulk Dot Com Help Forums” and noticed that the conveying length is 64m horizontal and 75m vertical, including 10 bends.

This is a rather long and complicated routing for a mechanical conveying system.

A pneumatic conveying pipeline is much easier to install and much easier to operate.

I have now changed my opinion in favour of the pneumatic conveying system, unless the mechanical system is already in place. (You state that you have the equipment available, suggesting that it still has to be mounted)

Best regards

Teus ■

Mechanical system of conveying requires much less power than pnumatic system with vent air dust collection system. In emerging economies, power is costly and maintenance labour relatively cheap. You have to do cost benefit analysis before selecting a system. Bucket elevetors are very reliable so are conveyors as well as airslides. You also have an option of using a pipe conveyor. ■

For such a low rate, use pne. transport as suggested before....

You will not have the payback for the extra Capital cost for the mech system

Be carefull of "flooding" from the silo and even quaking if the fly ash is settled for 4 weeks or so.....

Thanks

James ■

Our sister company, MAC Equipment, is a US-based provider of Pneumatic Conveying and Air Filtration solutions and could provide you with locally based support to assist you with this application.

If this is of interest please visit their website - www.macequipment.com or contact sales@macequipment.com

Best regards,

Clyde Materials Handling Ltd

www.clydematerials.com

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In a cement plant where I was associated, fly ash was received in lorries and was conveyed to silo by pneumatic pump. In Indian monsoon conditions, it is not easy to maintain bag type dust collectors when humidity is high. This reason and high power cost made us change the system to a screw conveyor, belt bucket elevator system. The system has worked well for years. ■

Due to the unique design of the LamiFlo System, Flyash can be transported up to 500m, and is extremely cost effective to operate.

www.lfpumping.com ■