Dust collection particle capture mechanisms

It has been argued that the theories behind these mechanisms may be valid for certain air filtration applications, where total-particle capture is vital however, for the purposes of industrial dust collection, they are of limited value. A sieving mechanism is probably more appropriate wherein the size of the apertures in the medium assumes a more dominant role, at least until the fibres have accumulated a layer of dust which then takes over the sieving action. 

In these conditions, due to the high relative velocity of the liquid and gas phases, a decisive influence on the effect of dust collection have mechanisms inertial and direct capture of particles. This process is implemented in a shock-inertial dust collector, which include investigated apparatus. 

Scrubbers make use of a combination of the particulate collection mechanisms listed in Table 5. It is difficult to classify scrubbers predominantly by any one mechanism but for some systems, inertial impaction and direct interception predominate. Semrau (153,262,268) proposed a contacting power principle for correlation of dust-scrubber efficiency the efficiency of collection is proportional to power expended and more energy is required to capture finer particles. This principle is applicable only when inertial impaction and direct interception are the mechanisms employed. Furthermore, the correlation is not general because different parameters are obtained for differing emissions collected by different devices. However, in many wet scrubber situations for constant particle-size distribution, Semrau s power law principle, roughly applies ... 

Like many original methods of mechanical process technology, an old technique for the successful removal of airborne dust was first observed in nature. The capacity of rain to clear the air has been used since ancient times to remove suspended dust particles by passing the contaminated gas through a water spray (wet scrubbers). The liquid droplets capture the solid (and some of the gaseous) pollutants and collect them in a sump. While this reduces air pollution it transfers part of the separation problem to a secondary cleaning process the removal of fine particulate solids from a liquid. 

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