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Hoppers & Silos

Photo 3: Prima Range

material flow. A typical example is shown in Photograph 2. It is important to note and understand several main advantages that Acoustic Cleaners have over alternative methods, which may have been tried in the past to try and aid material flow. Primasonics Acoustic Cleaners operate at frequencies very much higher than the resonance frequency of steel, ceramic lining, concrete etc. Therefore Primasonics Acoustic Cleaners are guaranteed not to cause vibrational damage to any vessel or structure. This is quite unlike vibrators, which by their

very nature and method of installation, cause vibration and stress weaknesses within the vessel or structure to which they are attached. The vibration resonances first have to pass through the vessel wall before reaching the material. With the Acoustic Cleaner, the higher frequencies are directly absorbed into material giving 100% efficiency. Air cannons/blasters seek to affect a very localised cure for a blockage problem, which has already occurred. In many cases the air cannon simply “blows” a localised hole through the blockage, necessitating the installation of many air cannons within the general problem area. It is generally true to say that one very rarely finds a single air cannon in effective operation. This is totally the opposite with Primasonics Acoustic Cleaners where a single Acoustic Cleaner can replace multi air cannons; however we then approach the problem with a totally different philosophy - by preventing the build up from occurring in the first place.


Acoustic cleaners are extremely simple in their operation, requiring only normal plant compressed air for their initial energy source.

Compressed air enters the Wave Generator and forces the only moving part, the ultra high- grade titanium diaphragm to oscillate very rapidly within its specially designed housing. These rapid oscillations create the base tone and the various different bell sections convert, amplify and distribute this base tone into a range of different key fundamental frequencies. Primasonics have selected seven such key fundamental frequencies for their Audiosonic Acoustic Cleaner range from 60 Hz to 420 Hz. The acoustic cleaners only require activating for a few seconds at periodical intervals. The Prima Range of Acoustic Cleaners is shown in Photograph 3. Primasonics Audiosonic Acoustic Cleaners are aiding material flow from hoppers and silos in such diverse industries as Cement, Gypsum, Flour, MDF Wood Products, Ceramics, Chemicals, Carbon Black, Petrochemicals and Power Plant. They are also employed in a range of ancillary plant such as filters, cyclones, fans, ductwork, SCRs. ESPs and steam/power generation plants. n For more information visit: and

Solids and Bulk Handling September 2014 27

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