Abstract: In order to reduce the quantity of scrap stainless steel folding wave pre-filter in the air supply system of a thermal machinery repair building of a nuclear power plant, and to increase the service life, a reuse process of stainless steel folding wave pre-filter was studied through experiments. The experiments include washing, ultrasonic vibration, high temperature dust removal, drying and other processes. The filtration resistance and weight efficiency of the pre-filter with 15 times reuse were studied. The results show that: The composite process of washing, ultrasonic vibration, high temperature dust removal and drying can effectively remove the artificial dust and fiber flocculent pellets accumulated in the stainless steel folding wave pre-filter, and the processed and reused pre-filter can restore the resistance of the clean pre-filter and the parameter requirements of the weight efficiency. When the number of reuse is less than 15 times, the weight efficiency is maintained above 86.11%. The number of reuse can reach more than 15 times. It is found that artificial dust tends to accumulate and clog the metal fiber pores on the surface of the filter, and this phenomenon gradually decreases as it extends to the inside of the filter layer.

Key words: pre-filter, reuse, artificial dust, weighing efficiency, resistance