关键词: 可吸入颗粒物, 布袋除尘器, 清灰, 清灰力, 沉积量

Abstract: Fine particles with mean size of 3.31 mm were used to form cakes on PPS filter or PET membrane filter with different deposit loadings. With a slowly increased reverse flow, the cakes were slowly blown out and the cake cleaning stress curve was measured. Meanwhile a low pressure pulse cleaning method was used to simulate the real pulse cleaning in practice. The results by both methods were compared and exhibited the agreement in predicting cleaning stress. The cake detachment stress decreased as the cake loading increases for both filters. For instance, the detachment stress of PET membrane filter decreased from 350 to 100 N/m2 as the cake loading increased from 200 to 401 g/m2, which was 90 N/m2 lower than that of the PPS filter. The low pressure pulse cleaning efficiency of PPS filter cakes showed a linear relationship to the cake loading, while the efficiency of PET membrane filter increased much quickly when the cake loading was lower than 200 g/m2. The cake patches obviously became larger as the cake loading increases for both filters.

Key words: fine particle, fabric filter, cleaning, cake detachment stress, cake loading