化工进展 ›› 2020, Vol. 39 ›› Issue (7): 2583-2589.DOI: 10.16085/j.issn.1000-6613.2019-1624

• 化工过程与装备 • 上一篇    下一篇

同心圈式旋转床的精馏实验

沈华峰1(), 李育敏1(), 计建炳1, 陈加齐2, 王炜2   

  1. 1.浙江工业大学化学工程学院,浙江省生物燃料利用技术研究重点实验室,浙江 杭州 310014
    2.浙江华科化工设备有限公司,浙江 湖州 313310
  • 出版日期:2020-07-05 发布日期:2020-07-10
  • 通讯作者: 李育敏
  • 作者简介:沈华峰(1995—),男,硕士研究生,研究方向为传质与分离技术。E-mail:sgenhuafeng@126.com

Distillation experiments in concentric-ring rotating bed

Huafeng SHEN1(), Yumin LI1(), Jianbing JI1, Jiaqi CHEN2, Wei WANG2   

  1. 1.Zhejiang Province Key Laboratory of Biofuel, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    2.Zhejiang Huake Chemical Equipment Limited Company, Huzhou 313310, Zhejiang, China
  • Online:2020-07-05 Published:2020-07-10
  • Contact: Yumin LI

摘要:

同心圈式旋转床是一种新型超重力旋转床,其转子由一组多孔板同心圈构成,相邻同心圈之间无填料或填充填料。液体在同心圈上存在滑移效应,滑移效应能够增大气液比表面积和改善液体在同心圈上的周向分布。本文采用乙醇-水物系对转子直径为1.0m的大型同心圈式旋转床进行全回流常压精馏实验,实验选用无丝网填料同心圈和填充丝网填料同心圈两种转子。实验结果表明,本大型同心圈式旋转床具有较大的处理量,其等板高度(HETP)随F因子和超重力因子的增大先减小后增大。填充丝网填料同心圈转子的HETP小于无丝网填料同心圈转子。在超重力因子为563.4和F因子为5.5(m/s)(kg/m3)0.5时,填充丝网填料同心圈转子的等板高度达到最小值51.5mm,每块理论板气相压降为1.5kPa。通过实验数据拟合得到了两种同心圈转子的HETP经验关联式。与折流式旋转床相比,同心圈式旋转床具有高通量和低压降的优点。

关键词: 同心圈式旋转床, 多孔板, 等板高度, 气相压降

Abstract:

A concentric-ring rotating bed, as a novel higee device, has a rotor consisting of several concentric rings made by perforated plates with and without packing between adjacent concentric rings. A liquid slip effect exists on the concentric rings, which, enhances the gas-liquid effective interfacial area and improves the liquid circumferential distribution. With ethanol-water system, total reflux distillation experiments were conducted in a concentric-ring rotating bed with a rotor of an outer diameter of 1.0m at atmospheric pressure. Two rotors with and without stainless steel wire mesh between adjacent concentric rings were used, respectively. The effects of F-factor and high-gravity factor on height equivalent of theoretical plate(HETP) and gas pressure drop across the concentric-ring rotating bed were analyzed. Experimental results showed that the large concentric-ring rotating bed has a large processing capacity. With increasing F-factor and high-gravity factor, HETP decreased first and then increased. The HETP values of the rotor with wire mesh were smaller than those of the rotor without wire mesh. The HETP minimum value of 51.5mm and the gas pressure drop per number of theoretical plate of 1.5kPa was obtained at a high-gravity factor of 563.4 and a F-factor of 5.5(m/s) (kg/m3)0.5 for the rotor with wire mesh. Correlations of HETP of rotors with and without wire mesh were proposed using experimental data. In comparison with rotating zigzag bed, the concentric-ring rotating bed has the advantages of high throughput and low pressure drop.

Key words: concentric-ring rotating bed, perforated plates, HETP, gas pressure drop

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