A Study of the Pulse Cleaning Process for Metal Fiber Filter Bags Based on a Discrete Phase Particle Deposition Model

Abstract

Emissions of airborne particulate matter are a major cause of air pollution. A numerical approach was used to establish a single-filter-bag cleaning model based on the discrete phase particle deposition distribution law to study the effect of pulse backflushing operation parameters on the cleaning performance of the specific structure of the dust collector. It was found that increasing the pulse blowing pressure (0.2 MPa to 0.6 MPa) and extending the pulse width (0.02 s to 0.1 s) resulted in an increase in the side wall pressure of the filter bag and, thus, improved its cleaning effect. The influence of the injection pressure on the side wall pressure peak of the filter bag was more obvious than that of the pulse width. However, it cannot be concluded that the greater the injection pressure and pulse width, the better the cleaning effect. Therefore, in the actual production application, the operating cost of the equipment needs to be taken into account, as well as the amount of dust on the surface of the filter bag.

Inhibition of Dust Re-Deposition for Filter Cleaning Using a Multi-Pulsing Jet

“…As the peak transient pulse pressure acting on the filter is commonly used as an indicator of the pulse-jet intensity [13,16,17,27], the peaks and durations of the changes in pressures with the pulse duration were analyzed, as shown in Figure 4. The peak pressure increased rapidly with the pulse duration t d when t d < 0.080 s, and remained almost the same value when t d > 0.080 s. The pressure duration exhibited a decelerating increase with the pulse duration without a clear critical value.…”