Mathematical model of high-humidity dust peeling during pulse-jet cleaning

In order to make the vibration characteristics of the filter material and the parameters of the dust remover cooperate optimally, and investigate the condition of dust peeling off from filter material, the mathematical model of high-humidity dust peeling off from the filtration material by pulse-jet cleaning was established:adhesion force< peeling force.The adhesion force of fine dust attached to the surface of the filtration material and the peeling force produced by the vibration of filter material during pulse-jet cleaning were studied.For the fine dust with a diameter of less than 50 μm, the adhesion force is mainly influenced by van der Waals force and liquid bridge force.The opposite acceleration generated by pulse-jet vibration affects the magnitude of the peeling force.By establishing the vibration equation of filter material under pulse-jet cleaning, which was solved by Laplace transform technique, the relationship between the peak pressure of the wall and the opposite acceleration was obtained.According to the mathematical model of dust peeling, the range of peak pressure on the wall surface was solved when dust peeling off.Finally, the model was verified by the pulse-jet experiment under different working conditions at injection pressure of 0.15, 0.2, 0.25 MPa respectively.The results show that when the peeling force is greater than the adhesion force, the high-humidity dust peels off from the filter material, and the flaking of dust affects the effect of ash cleaning.According to the mathematical model of dust peeling, the variation of the maximum opposite acceleration was obtained by calculating the peeling force, and then the variation law of the wall peak pressure at the time of dust spalling was obtained, and it was calculated according to the given parameters that the peak pressure of the wall is 306 Pa when the peeling force is greater than the adhesion.Comparing with the experimental results of different working conditions in the pulse injection test of 0.15, 0.2, 0.25 MPa, it was found that the peak pressure of the wall at 0.2 and 0.25 MPa was greater than 306 Pa.Meanwhile, in the pulse jetting test on the powder filter material, the dust removal rate is 92.55% and 92.8%.The research results have theoretical and practical significance for improving the pulse cleaning effect of high-humidity dust.