HOW IS DUST TACKLED?
Dust is the fine dispersion of airborne particles of matter caused by mechanical processes or air turbulence.
The atomized mist generated by dust-binding sprayers dampens and weighs down the particulate matter. The weight gain forces the dust particles to settle quickly.
DOES THE DUST REDUCTION DEPEND ON THE SIZE OF THE WATER DROPLETS?
Yes. Water droplets which are too big, such as those produced with a hose, are inefficient at binding the dust. The available surface area of the droplet is smaller in comparison to water mist and the droplets are heavier. Therefore they only remain in the air for a short time and this significantly reduces their dust-binding potential.
By contrast, very small droplets of water (e.g. steam) have a higher degree of efficiency but are heavily dependent on the wind and cannot easily be steered by the turbine. In any given case the ideal droplet size depends on the application.
As a result, for optimum dust management, it is essential to be able to select the droplet size.
WHY IS THERE NOT A STANDARD SOLUTION FOR ALL DUST PROBLEMS?
Dust is generated in all kinds of areas by many different sources. There are different demands in terms of dust control depending on the operating conditions and the material being processed. Every single source of dust must therefore be analyzed in order to find the right way to bind and minimize it. The questions to ask might include the following: is the dust coming from a fixed or moving source? Can the material be made wet or will this affect the manufacturing process? What volumes of dust are being generated?
In order to find the right solution to every individual dust problem, Englo can supply various models of its standard dust-binding sprayers as well as customized spray systems.
HOW MUCH WATER DOES A DUST-BINDING SPRAYER USE?
The water consumption of a dust-binding sprayer can be adjusted according to requirements. The standard consumption in routine cases of demolition is 40 to 70 l/min. This corresponds to roughly one tenth of the water used for demolition work using the conventional C hose.
The ideal rate of consumption for recycling applications is 15 to 30 l/min. The amount of water deposited in this way is less than 1 mm per hour – insufficient for puddles to form on the ground, for the material to get wet and for its weight to change.
In less frequent cases (e.g. leaching and scrubbing processes), greater water throughput rates are required and these can also be guaranteed by the EmiControls dust-binding sprayers.
DO DUST-BINDING SPRAYERS GENERATE SNOW AT SUB-ZERO TEMPERATURES?
The EmiControls dust-binding sprayers do not generate ice droplets or snow at air temperatures as low as -10 °C (they would need an air compressor and nucleation nozzles to be able to do this). Therefore dust-binding sprayers can also be used at sub-zero temperatures to control dust emissions.