Experimental Research of Dust Power of Filtering Materials for Anti-Dust Respirators

Abstract

The purpose is to carry out experimental investigations of the physicochemical properties of filtering materials for the manufacture of two-layer filters of high dust capacity of dust respirators for operating conditions of coal mines. The dust capacity of filter materials for the manufacture of two-layer filters was determined at a dust concentration of about 400 mg/m3, with a final pressure drop of 500 Pa (according to the requirements of DSTU EN 143 for filters of the 2nd class of protection). "AFA VP-10" filters with a diameter of 36 mm were used; "VLO 200" laboratory scales; "HS43" electronic stopwatch; the pressure drop on the filter boxes was monitored using an "MKV 250" compensation micro manometer. It is established that in order to increase the dust capacity of dust filter respirators, their filter should be combined with filter materials with different physicochemical properties to ensure a uniform distribution of dust sediment over the thickness of the filter layer. It is proved that the increase in the duration of the protective action of dust suppressors is possible due to the effect of aftofiltration, when the settled dust layer on the filter surface independently delays aerosol particles. The dependence of the differential pressure on the filter of the dust respirator on the change in the density of packing of fibres with dust is obtained, which allows determining the rational physicochemical properties of the materials of the filter layers of the filter for maximum dust intensity. It was found that the smallest increase in the air flow resistance of the multilayer filter was recorded by combining the filter layers with the fibre packing density of 30 and 60 g/cm3, respectively. The experimental dependences are established that will allow finding a rational combination of filter layers to ensure maximum dust capacity of the filter.