Re: Fluidization In Silo Design
Since you have not built the silos yet, why not actually design them to discharge reliably by gravity alone (possibly using a small amount of air to aid dilation)? Your discharge rate would be considerably easier to control than it would if you were to inject large quantities of air (implied by your reference to fluidising). I would strongly suggest that as a minimum requirement you should al least get the wall angles determined from shear testing of the powders that you intend to use - prefereably have a full design for reliability (i.e. including outlet sizing and time consolidation effects). You should also consider carefully the design of the discharge metering equipment to ensure full activation of the outlet.
Money invested at the start of the project on obtaining reliable mass flow discharge will pay dividends in the long run (and save you energy and compressed air!).
Regards
Richard Farnish
The Wolfson Centre for Bulk Solids Handling Technology
Chatham
Kent, UK
r.j.farnish@gre.ac.uk
www.bulksolids.com ■
Re: Fluidization In Silo Design
200 kg/hr. That's not a very great rate for the size of silo? You may want to think of feeding a higher rate to a small buffer hopper and then extract the low rate from this. ■
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Re: Fluidization In Silo Design
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Fluidization in silo design
Hi everybody,
we are developing a system for injecting activated carbon in a sinter plant.
The design implies the installation of two silos of 120 m3 of capacity, one for activated carbon (20 micrometer particle size) and one for limestone (about 150 micrometer particle size). We still haven´t designed the silos, but our idea aims at helping the discharge by means of a fluidization system (with nitrogen for the carbon and compressed air for the limestone).
The discharge rate will be around 110 kg/h for activated carbon and 200 kg/h for limestone.
I would like your support for finding out an approximated figure of the design flow values of air and nitrogen that we should consider, since we would like to check that our existing nitrogen system is able to cope with the new consumption, by one hand, and, by the other hand, to get an initial idea of the air compressor size that we should install.
Besides, I would be much interested in any other help or comments that you could provide regarding this matter of silo fluidization
Best regards ■