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Hoppers & Silos Sound housekeeping


Eliminate material side wall build-up and bridging with a sound solution


Photo 2: P


rimasonics Acoustic Cleaners are widely employed wherever ash, dust and powders are generated, processed, stored or transported. This range of acoustic cleaners has been of tremendous benefit in both preventing material hang-up and ensuring maximum, continuous material flow in silos and hoppers. Indeed some of Primasonics most challenging but successful applications were within silos which contained dry materials such as cement, chemicals, carbon black gypsum and food. Primasonics have solved silo storage problems in over 50 countries worldwide.


The two main problem areas within hoppers and silos are:- • Ratholing – where the material builds up on the sidewalls causing severely reduced “funnel flow”, which also restricts the silo being used to its full storage capacity. • Bridging – where the material bridges


26 September 2014 Solids and Bulk Handling


over the outlet area either severely restricting flow or stopping it completely. Irrespective as to whether the bulk material storage facility is under 500 kg or over 30,000 kg capacity Primasonics Audiosonic Acoustic Cleaners have eliminated both of these problems. Typical examples range from small 20 tonne capacity internal pre-packing hoppers right up to 30,000 tonne capacity cement silos. Where the problem is ratholing with the material building up on the sidewalls, a low frequency, larger Primasonics Acoustic Cleaner model such as the PAS-60 or PAS-75 is mounted on top of each silo to prevent material wall and thus ensure that the full capacity of the silo is utilised. These units can be located at any position on top of the silo, as sound waves travel at over 344 metres per second and in a 360° radius. Generally speaking they are mounted on top of an existing inspection hatch, thus installation is


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Photo 1: One of two PAS 75 on silo CIM Haiti


simple and inexpensive. A typical example is shown in Photograph 1. Moving on to silo and hopper discharge, in such applications one of the smaller Primasonics Audiosonic Acoustic Cleaners model such as the PAS-350 or PAS-420 with higher frequencies is employed. The higher the frequency the shorter the wavelength and so all the acoustic power created by the Wave Generator is concentrated over a much shorter range – say between 1 and 5 m. Therefore a higher frequency Primasonics Audiosonic Acoustic Cleaner mounted just above the discharge will prevent material bridging and ensure even maximum


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