›› 2019, Vol. 21 ›› Issue (4): 103-111.

• Simulation and Optimization • 上一篇    下一篇

Comparison of mass transfer characteristics between countercurrent-flow and crosscurrent-flow rotating packed bed

祁贵生1,郭林雅2,刘有智3,张栋铭3   

  1. 1. 超重力化工过程山西省重点实验室
    2. 山西省太原市中北大学
    3. 中北大学
  • 收稿日期:2019-02-25 修回日期:2019-04-24 出版日期:2019-12-30 发布日期:2019-12-30
  • 通讯作者: 祁贵生 E-mail:67486707@qq.com
  • 基金资助:
    燃煤工业锅炉超低排放控制技术;燃煤工业锅炉烟气超低排放技术与装备研发

1,Lin-Ya GUO2, 1,dongming dmzhang1   

  1. 1.
    2. The North University of China
  • Received:2019-02-25 Revised:2019-04-24 Online:2019-12-30 Published:2019-12-30

摘要: Rotating packed bed (RPB), mainly including countercurrent-flow RPB (Counter-RPB) and crosscurrent-flow RPB (Cross-RPB) classified from the perspective of gas-liquid contact style, is a novel process intensification device. A significant measure standard to evaluate performance of RPB is mass transfer effect. In order to contrast the mass transfer characteristics of Counter-RPB and Cross-RPB that with the same size, liquid volumetric mass transfer coefficient (klae) and effective interfacial area (ae) were measured under identical operation conditions. Meanwhile, comparison of comprehensive mass transfer performance was conducted with ΔP (pressure drop)/klae as the standard. Experimental results indicated that klae and ae increased with increase of liquid spray density q, gas velocity u and high gravity factor β. Furthermore, compared with Cross-RPB, Counter-RPB has higher liquid volumetric mass transfer coefficient and slightly larger effective interfacial area. The experimental results of comprehensive mass transfer performance showed that the Counter-RPB had higher ΔP/klae than the Cross-RPB with changes of liquid spray density and high gravity factor, and there exists a turning point at 0.71 m/s accompanied by a variation with gas velocity. Moreover, the relative error of experimental values to calculated values calculated by the correlative expressions of klae was less than 5%. In conclusion, the mass transfer characteristics of RPB are deeply impacted by the manner in which the flows are established and Cross-RPB would have a great potential for industrial scale-up applications.

关键词: rotating packed bed, mass transfer, crosscurrent-flow, countercurrent-flow, process intensification

Abstract: Rotating packed bed (RPB), mainly including countercurrent-flow RPB (Counter-RPB) and crosscurrent-flow RPB (Cross-RPB) classified from the perspective of gas-liquid contact style, is a novel process intensification device. A significant measure standard to evaluate performance of RPB is mass transfer effect. In order to contrast the mass transfer characteristics of Counter-RPB and Cross-RPB that with the same size, liquid volumetric mass transfer coefficient (klae) and effective interfacial area (ae) were measured under identical operation conditions. Meanwhile, comparison of comprehensive mass transfer performance was conducted with ΔP (pressure drop)/klae as the standard. Experimental results indicated that klae and ae increased with increase of liquid spray density q, gas velocity u and high gravity factor β. Furthermore, compared with Cross-RPB, Counter-RPB has higher liquid volumetric mass transfer coefficient and slightly larger effective interfacial area. The experimental results of comprehensive mass transfer performance showed that the Counter-RPB had higher ΔP/klae than the Cross-RPB with changes of liquid spray density and high gravity factor, and there exists a turning point at 0.71 m/s accompanied by a variation with gas velocity. Moreover, the relative error of experimental values to calculated values calculated by the correlative expressions of klae was less than 5%. In conclusion, the mass transfer characteristics of RPB are deeply impacted by the manner in which the flows are established and Cross-RPB would have a great potential for industrial scale-up applications.