SLOTTED FILTER REGENERATION EFFICIENCY

Abstract

This aim of this research was to study the mechanism and efficiency of the regeneration of filtering walls by means of reverse jet blasting with a rotating nozzle during dusty gas treatment by a slotted filter. Within a series of experiments, the rotational speed of the blowing nozzle and its distance to the filtering wall, the number of wire layers and the gaps between them were varied. Air consumption for filtration and purging was measured along with the hydraulic resistance of a clean filtering wall, a wall with dust sedimentation and one following regeneration. The balance of the forces acting on the dust sediment during regeneration and the conditions for the separation of the sediment from the filtering wall were analysed, allowing the minimum velocity of the blowing jet to be mathematically defined. A dependency relation is proposed for calculating the effective working speed of the jet, which ensures efficient regeneration and minimum purging costs. The efficiency of regeneration is found to be exponentially related to the residual creep resistance index determined by the conditions of filtration and regeneration. A dependency relation is derived to calculate the regeneration coefficient, which can be recommended for determining the total hydraulic resistance of the slotted filter, taking into account the resistance of the clean filtering wall, the resistance of the dust sediment and the residual resistance of the filtering wall after regeneration.