Effect of circular pulse injection on uniformity of dust cleaning in filter cartridges

YANG Guanghui; ZHOU Meiyibai; LIN Tao; HUANG Wanlan; XIE Zhiyu; LIN Longyuan; CHEN Haiyan

doi:10.13732/j.issn.1008-5548.2023.06.012

Abstract：In order to investigate the effect of circular pulse injection on the uniformity of dust cleaning in filter cartridge,the distribution characteristics of side wall pressure along the axial and horizontal circumferential directions of filter cartridge were studied by changing injection pressure under two different pulse injection methods,namely the nozzle and the built-in rotator,at the optimal injection distance.The results show that when using a regular nozzle,the pressure on the side wall from top to bottom along axial direction of filter cartridge gradually increases,and the pressure in the lower part is greater than that in the middle and upper parts.When using a built-in rotator,the pressure distribution on side wall of filter cartridge is small in the upper part,and the pressure difference between the middle and lower parts is not significant.In the horizontal circumferential direction of the filter cartridge,the peak pressure on side wall is not completely symmetrical.Compared with ordinary nozzles,the difference in peak pressure on the side wall of the built-in rotator in the horizontal circumferential direction does not exceed 100 Pa,and the standard deviation of pressure at each measuring point is significantly reduced by 48.14％～95.38％compared to ordinary nozzles indicating that the uniformity of circular pulse injection is better.Circular pulse injection can significantly improve the cleaning intensity in the middle of filter cartridge and the uniformity of cleaning in axial and horizontal circumferential directions of filter cartridge,while reducing the impact of pulse airflow on the bottom and improving the problem of filter material damage in the lower part of filter cartridge.