Deep purification of low concentration fine particles in a cross flow rotating packed bed

Abstract

BackgroundThe traditional wet dust removal technology is not effective in removing fine particles with low concentration, which is far from meeting the ultra-low emission and production requirements. However, national emission requirements for fine particles are becoming more stringent year by year. Therefore, it is vital to explore a purification technology for low concentration of fine particles. MethodsCoal-fired fly ash was used to simulate low concentration dust-containing gas and a pilot-scale experimental system was set up employing a cross-flow rotating packed bed (RPB) as the wet separation device to explore the purification capacity of high gravity wet dust removal technology for low concentration fine particles. Significant FindingsThe obtained results suggested that under the operating conditions of inlet dust concentration of 50 mg/m3, high gravity factor of 138.36, gas velocity of 1.71 m/s and liquid spray density of 4.8 m3/(m2·h), the dust removal efficiency was 99.46%. The cut-off particle size of RPB was 0.09 μm, and the fine particles removal efficiency with particle size above 0.2 μm was more than 95%. It can be seen that high gravity wet dust removal technology is a wonderful technology for deep purification of fine particles with strong industrial application potential.