Abstract
Pulsed-jet cleaning is recognized as the most efficient method to regenerate bag dust collectors traditionally used in industrial processes to control the emission of particulates. In this study, non-woven needle felt filter bags with and without a film coating material have been analyzed considering different geometries (different number N of pairs of pleated filter bag sides) in the frame of dedicated low-pressure pulsed-jet cleaning experiments. The flow structure inside the bag and the response characteristics of its wall have also been analyzed numerically through a computational fluid-dynamics/structural-dynamics (CFD-CSD) unidirectional fluid-solid coupling method. As shown by the experiments, the peak pressure (P0) on the wall of the filter bag with N = 8 and 12 is higher, which indicates dust can be removed more effectively in these cases. The peak pressure on the wall increases first and then decreases along the direction of the bag length, while the peak pressure of the pleated filter bag with non-woven needled felt film coating is greater than that without film coating. A comprehensive analysis of the time variation of acceleration, deformation, strain, stress and other factors, has led to the conclusion that the pleated filter bag with N = 12 would be the optimal choice.
Highlights
Steel, cement, mining and other industrial processes can produce a large amount of dust, and the problem of severe air pollution caused by dust emissions has attracted great attention [1–3]
It can be seen that the instantaneous positive pressure peak appears and the negative pressure value appears at p1. This is mainly due to the rapid ejection of compressed air from the air bag under the control of the pulse controller to induce the surrounding air flow into the bag, which makes the filter bag appear instantaneous positive pressure, and the upper part of the pleated filter bag will generate a large negative pressure in a transient injection time due to the high air flow speed
It can be seen that the peak pressure value of non-woven needled pleated filter bag with film coating is higher than that without film coating because the coated filter material is a composite filter material covered the surface of needled felt with microporous film [43]
Summary
Cement, mining and other industrial processes can produce a large amount of dust, and the problem of severe air pollution caused by dust emissions has attracted great attention [1–3]. The results showed that the static pressure on the surface of trapezoidal filter cartridges was the most uniform, and the peak pressure near the pleat tip was the highest Their numerical study reported the effect of cylinder shape on dust cleaning performance of pulsed-jet pleated filter cartridges. For convenience, the previous numerical studies on pulsed-jet cleaning of pleated filters mostly assumed that the filter medium did not deform, which failed to fully reflect the changes in the dust cleaning process caused by deformation of filter bags. Numerical simulation calculation of airflow distribution inside the bag and transient structural dynamics calculation of pleated filter bag are conducted to analyze the flow structure inside bag and the response characteristics of its wall in the low-pressure pulsed-jet cleaning process. Experimental and Numerical Study on Dust Cleaning Performance of Pleated Filter Bag
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