INTRODUCTION


   The main classes of separators of particulates from gases comprise inertial separators, filters, (wet) scrubbers and electrostatic precipitators, each technique having its proper niche and each having its advantages and disadvantages.

   There is a new class of equipment available today. The Turbulent Flow Precipitator (TFP) for Mist and dust collection. These systems are rapidly gaining popularity because they have advantages over each and every known type of separator and they have very few limitations. The ELIMINATOR series TFP is far more efficient for the removal of fine particles than inertial separators, unlike filters they do not plug up, they do not present secondary disposal problems and they require less maintenance than electrostatic precipitators.They are equally suitable for the removal of solid and liquid particles from gases.

       The Turbulent Flow Precipitator (TFP) is a mechanical dust collector in which turbulence is used to collect even sub-micron particles with a high efficiency. TFP technology has been tested with solid particulates such as powder pigment dust, fibreglass particles, cotton lint, wood, aluminum and ambient household dusts. Dust particles can be removed from indoor air hence reducing the need for intake of fresh outdoor air; this translates into energy savings for the factory, office or home. Industrial-size TFPs of various designs can treat process air that has source-captured dusts or liquid droplets to improve factory working conditions, provide energy savings by reducing ventilation requirements and increase safety by reducing oil contamination. In research conducted at the University of Waterloo by Dr. Francis Dullien, turbulence has been exploited to advantage in various gas-cleaning systems, but the TFP, his latest invention, utilizes turbulence in a novel and different way. Particulates, when deposited on the collectors of a TFP by turbulent deposition are not re-entrained by the flow since the flow velocity at the collector surface is significantly reduced.

       The Turbulent Flow Precipitator (TFP) does not restrict the passage of air as all pass-through filters must; it operates continuously at full efficiency and constant pressure differential. The Figure above  illustrates the TFP principle. Inside the TFP there are two air spaces. One allows free flow of the dusty gas while the other consists of quiet zones where there is no net flow. Particles are ejected from the gas stream by turbulent velocity fluctuations and are deposited on collector surfaces. In the larger industrial models, dust is removed by vibrators from the TFP via a shuttered bottom gate at the base of a trough hopper (lower section), then to the final discharge point by a conveyor. In the case of oil mist eliminators, the liquid collected drains from the front of the oil mist eliminator TFP unit.
 


 

The aim of this MCIP is the study of a turbulent flow precipitator using STARCD. It was the occasion to use this CFD tool in an industrial problem.