Study On The Removal Of Soot Particles By Co-current Rotating Packed Bed

In the treatment of atmospheric environmental pollution,the removal of soot particles in diesel vehicle exhaust has always been a research hotspot.At present,the traditional diesel vehicle exhaust purification technology at home and abroad is mainly exhausting catalytic oxidation technology（DOC）and particulate filter capture technology（DPF）.DOC technology can remove about 90%of soluble organic matter（SOF）in the particulate matter but has little purification effect on other components（such as carbon black and sulfate）in particulate matter.DPF technology is one of the most widely used purification technologies,and its regeneration has always been a problem.When the diesel vehicle is working,the exhaust gas temperature is difficult to reach the regeneration temperature,so it is necessary to add a catalyst or external energy（such as electric heating,microwave heating,etc.）.A large number of researchers also use low-temperature plasma to purify exhaust gas.Compared with DOC technology and DPF technology,this technology has low and unstable particulate matter purification efficiency,and measures must be taken to improve the purification capacity（adding precious metal catalysts,etc.）.High gravity is the force exerted by a substance tens or even hundreds of times the gravitational acceleration of the Earth itself.High gravity technology is widely used in environmental protection fields such as dust removal,desulfurization,and denitrification.In this paper,the research on the removal of soot particles in diesel vehicle exhaust by the concurrent rotating bed was carried out.The effects of gas velocity,high gravity factor,and liquid spray volume on the removal rate of soot particles were studied by self-made co-current rotating bed equipment.It is found that the removal rate can reach 98.1%when the high gravity factor is 580,the liquid spray volume is 16 m³/（m²·h）and the gas velocity is 2.43 m/s.Using response surface analysis,the model was obtained by experimental data fitting and the best experimental results were obtained by optimization.The interaction between every two factors on the removal rate of soot particles was not significant.The gas pressure drop of high gravity rotating bed can directly reflect the energy consumption of the equipment,so its characteristic research has application significance and environmental protection significance.In this paper,the co-current rotating packed bed was selected as the main equipment,and the air-water system was used.The static bed pressure drop,centrifugal pressure drop,dry bed pressure drop,and wet bed pressure drop of the co-current rotating packed bed were studied in the range of high gravity factor from 0 to 580,the gas velocity from 3.42 to 7.05 m/s and liquid spray density from 4 to19 m³/（m²·h）.Combined with the experimental data fitting,the gas phase pressure drop model was established,and the correlation of gas phase pressure dropΔp _T=2.21u²+0.258β^1.27u^-0.51+1.05β^0.83q^-0.01u^1.11 was obtained.The relative error between the calculated simulation value and the experimental data value is within±14%,which provides a theoretical and practical basis for the calculation of the gas phase pressure drop of the co-current rotating packed bed.Figure[29]Table[18]Reference[67]...