EFFECT OF SILICON FINISH ON THE BEHAVIOUR OF REGENERATED SURFACE FILTERS AT DIFFERENT DUST CONCENTRATION

摘要

This paper discusses the effect of two different filter media, viz. polyester filter fabric treated with silicone finish and polyester fabric filter without treatment, and two different dust concentrations (50 and 90 g/m3) on the performance of pulse-jet filtration. The fabrics were tested based on cleaning at fixed peak pressure drop for an equal number of test cycles during the first three phases (i.e. conditioning, ageing and stabilis-ing) and for the same time duration during the final measuring phase. Silicone treated filter fabric showed better filtration efficiency compared to untreated fabric. At higher dust concentration, the reduction in effi-ciency was much lower in the case of the treated filter. A light scattering aerosol spectrometer system was used for analysing the emitted particles from the filter media. Particulate parameters like PM2.5 and PM10 emissions, number concentration and mass concentration of particles were less for the treated filter fabric. After the ageing process, the silicone treated filter showed a smaller rise in pressure drop compared to the filter without treatment. The silicone treated fabric also showed more or less the same pattern of particle size distribution for emitted particles when tested at both higher and lower dust levels, but for the untreated fabric the distribution curve was much broader at the lower dust concentration. However, the difference in the particle size distribution pattern of emitted particles was marginal among the two fabrics when tested at a higher dust concentration. Experimental work was also carried out by analysing the residual pressure drop pattern with time for both fabric types, but no clear pattern was observed for the residual pressure drop. It was found that the treated fabric showed more predictable results compared to the untreated fabric.