Research On The Performance Of Pulse Jet Cleaning Of Filter Cartridge Dust Collector Based On Collecting Adhesive Dust

Pleated filter cartridges are widely used in industrial production to control particulate matter emissions and recover valuable particulate matter.Pulse jet cleaning is a major method for filter regeneration.However,for pleated filter cartridges to collect highly hygroscopic and viscous dust(such as polyacrylamide),the compressed air source that is conventionally processed by the refrigerated compressed air dryer will form a low temperature area at the nozzle during spraying,which will release moisture into the environment,causing the particles to adhere to the filter after absorbing moisture,and the resistance of the filter cartridge dust collector will increase drastically during operation.Therefore,this article proposes a drier gas source(i.e.nitrogen)for collecting polyacrylamide dusts to improve the performance of dust cleaning.In this paper,numerical simulation,theoretical analysis and industrial dust cleaning experiment were used to verify that the cleaning performance of dry air source injection is better than that of compressed air injection.Numerical simulations have calculated that a low temperature area will be formed at the nozzle during pulse jet cleaning,and the temperature of the low temperature area has been reduced by nearly half compared to the set temperature.Therefore,the compressed air source processed by the conventional refrigerated compressed air dryer will release moisture into the environment due to the decrease in temperature.In addition,the industrial dust cleaning experiment obtained by changing the filtration velocity and injection air source,it was concluded that when the filtration velocity was 0.7 m/min,the system running resistance during compressed air injection is 275 Pa higher than that of nitrogen,which verified the conclusions drawn by the numerical simulation.Then,through the industrial dust cleaning experiment,the conditions that affect the dust removal performance of the adhesive dust collection filter are specifically studied.Change the filtration velocity,dust concentration and injection gas source,and record the system operation resistance,ambient temperature and humidity during operation,the dust residual after operation.Finally,it can be concluded that the environmental humidity has no effect on the cleaning performance under low humidity conditions.At this time,the moisture content of the injection air source is the main reason for the cleaning performance;under high humidity conditions,the environmental humidity has two effects on the cleaning performance.When the absolute humidity is<10 g/m~3,the increase in the relative humidity of the environment will increase the resistance of the system and increase the dust residual.When the absolute humidity is>10 g/m~3,the dust will begin to dissolve due to the absorption of too much water,which will increase the liquid bridge force between the particles.Therefore,the dust residual and the state of the dust attached to the filter cartridge have a more intuitive effect on the performance of dust cleaning.The dust concentration is50,75,100 g/m~3,and the absolute humidity range under high humidity conditions is≥11.15 g/m~3,≥25.4 g/m~3,17.8～22.8 g/m~3.Finally,the pulse injection experiment platform was used to measure the peak pressure on the side wall of the filter cartridge using the same injection parameters as the industrial dust removal experiment to quantify the injection intensity.According to the experiment,the minimum peak pressure of the side wall of the filter cartridge is 768.6 Pa.Combined with the data obtained from industrial experiments,this peak pressure value can effectively remove dust under low humidity conditions,and under high humidity conditions,the dust adhesion force is much greater than the peeling force,therefore,it cannot effectively remove dust from filter surface.The above research results provide a new idea and reliable data references for industrial collection of adhesive dust.