Comparison of filtration performances of cleanable fabric filters measured by VDI and JIS testing rigs

The VDI type 1 rig and JIS rig are two of the major testing rigs for cleanable fabric filters. We measured the filter performance using these rigs and compared the results in order to characterize the two testing rigs. The filter performance tests showed that the filter cleaning efficiency measured with the VDI type 1 rig is higher than that with the JIS rig. The difference in cleaning efficiency led to the different residual pressure drop after the aging of the filter. The difference in filter performance measured by the two rigs can be minimized by modifying the aging condition, i.e. either reducing the number of filtration cycles during the aging with the JIS rig or increasing it with the VDI type 1 rig so as to give the same residual pressure drop after aging. Furthermore, it is found that there is an optimum filtration cycle time to grow the residual pressure drop during the filter aging in order to minimize the time period of filter aging.