4.7 Article

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

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DOI: 10.1016/j.jtice.2023.104723

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Fine particles; Cross-flow RPB; Wet dust removal

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The traditional wet dust removal technology is ineffective in removing fine particles with low concentration. Therefore, it is vital to explore a purification technology for low concentration of fine particles. A pilot-scale experimental system employing a cross-flow rotating packed bed was set up to explore the purification capacity of high gravity wet dust removal technology for low concentration fine particles.
Background: The 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. Methods: Coal-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 Findings: The obtained results suggested that under the operating conditions of inlet dust concentration of 50 mg/m(3), high gravity factor of 138.36, gas velocity of 1.71 m/s and liquid spray density of 4.8 m(3)/(m(2)center dot h), the dust removal efficiency was 99.46%. The cut-off particle size of RPB was 0.09 mu m, and the fine particles removal efficiency with particle size above 0.2 mu m 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.

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