Influence of pulsing-air injection distance on pressure drop in a coke dust bagfilter

Abstract

The effect of the pulsing-air injection distance between the nozzle and venturi on total pressure drop was investigated in a pilot-scale pulse-jet bagfilter for coke dust of a steel mill factory. Theoretical and empirical models were used to predict the pressure drop. The empirical model contains two parameters--dust cake resistance and exponent of areal mass density--to be estimated by experiment. The optimum injection distance for minimizing the total pressure drop was evaluated by 64 experimental data at a fixed filtration velocity and pulse pressure in the practical ranges of dust concentration and pulse interval time. The dust cake resistance shows a minimum value at the optimum injection distance. The empirical model is in good agreement with the experimental data, showing a correlation coefficient of 0.952.

Design of pulse-jet systems for milk powder baghouses

“…The type of nozzle used here should therefore be positioned at least 0.7 m above the bag opening for a bag diameter of 200 mm. Comparing this optimum height with previous results for open-tube nozzles [24,28] shows that the nozzle and flow diverter used here produce a jet with a low expansion angle and a relatively high optimum height.…”

“…Consequently, there is an optimum nozzle position that strikes a balance between these effects, maximizing the entrainment of secondary air into the pulse jet while avoiding the partial jet occlusion that can occur at high nozzle positions. Several authors have experimentally determined the optimum nozzle positions for a range of baghouse designs [17,28]. For a plain circular nozzle, the optimum position can be predicted by using jet spreading angles from the literature to find the distance at which the jet width matches the bag opening diameter [24].…”

Preparation and filtration property of hemp-based composite nonwoven

“…Das et al [8] assessed the influence of filtration time on filtration efficiency and pressure drop, and the results indicated that filtration time had smaller effect on filtration efficiency while higher effect on pressure drop. Moreover, the pressure drop increased with the increasing of filtration time [9]. Yeo et al [10] reported that pressure drop increased with the increasing of flux as the liquid flowing through porous nonwoven and filtration efficiency for different particles increased with the increase of particle diameter.…”