Abstract： To solve the cleaning difficulty for collecting the pesticide fungicide of 64 % (mass fraction) difenoconazole-mancozeb wettable powders due to the characteristics of high adhesion, according to the theory of fluid dynamics and using peak pressure as an index to evaluate the cleaning effect, the average peak pressures along the filter test with three different jet conditions were measured in a self-built pulse-jet cartridge filter test equipment. The results show that the peak pressures along the filter cartridge are respectively 2.016 2, 3.815 4 and 5.480 7 kPa with three different jet conditions. The cleaning system can operate steadily only when the average peak pressure reaches 5.480 7 kPa, and the pressures drop of the cartridge filter is about 1 400 Pa, which achieves a good cleaning effect and ensures better collection of the pesticide powders.

Keywords: cartridge filter; pesticide powder; wall pressure of cartridge; nozzle; cleaning effect