化工进展 ›› 2023, Vol. 42 ›› Issue (5): 2289-2297.DOI: 10.16085/j.issn.1000-6613.2022-1213

• 化工过程与装备 • 上一篇    下一篇

泡沫碳化硅波纹规整填料骨架结构对其传质性能的影响机理

陈伟良1(), 高鑫1,2(), 李洪1,2, 李鑫钢1,2   

  1. 1.天津大学化工学院,精馏技术国家工程研究中心,天津 300350
    2.物质绿色创造与制造海河实验室,天津 300192
  • 收稿日期:2022-06-29 修回日期:2022-11-12 出版日期:2023-05-10 发布日期:2023-06-02
  • 通讯作者: 高鑫
  • 作者简介:陈伟良(1997—),男,硕士研究生,研究方向为分离过程强化。E-mail:liangweichen@163.com
  • 基金资助:
    国家自然科学基金(21336007)

Influence mechanism of skeleton structure of foamed SiC corrugated structured packing on the mass transfer performance

CHEN Weiliang1(), GAO Xin1,2(), LI Hong1,2, LI Xingang1,2   

  1. 1.School of Chemical Engineering and Technology, National Engineering Research Centre of Distillation Technology, Tianjin University, Tianjin 300072, China
    2.Material Green Creation and Manufacturing Haihe Laboratory, Tianjin 300192, China
  • Received:2022-06-29 Revised:2022-11-12 Online:2023-05-10 Published:2023-06-02
  • Contact: GAO Xin

摘要:

ϕ100mm×2000mm的常压精馏塔中使用乙醇-正丙醇作为标准物系,对6种不同骨架结构及表面性质的泡沫碳化硅波纹规整填料(SCFP)的传质性能及操作压降进行了实验测试,探究了结构对填料传质性能的影响。结果表明,6种填料都有着较优秀的传质性能表现,理论板最低可达每米5块。其中,纯质碳化硅型填料的整体传质性能要优于富硅型填料;随着孔隙率的增大,富硅型填料的传质性能有所下降,纯质碳化硅型填料的性能则有所提高;压缩比的增大有利于纯质碳化硅填料的传质性能。在压降表现方面,6种填料的操作压降均随着气相负荷的增大而有所增加,但彼此之间差异不大。同时采用紫外荧光示踪剂方法对单波纹片上液体的流动行为进行了观察,对不同填料表面液体的润湿面积、横向润湿长度进行了对比,结果表明,传质效率表现较高的填料其表面的液体润湿效果更好,有着更大的润湿面积、更长的横向润湿长度。

关键词: 碳化硅, 泡沫陶瓷, 精馏, 规整填料, 流体力学, 传质效率

Abstract:

Mass transfer performance and operating pressure drop of six structured corrugation foam packing (SCFP) were evaluated and compared using a ϕ100mm×2000mm packing performance test column with ethanol/n-propanol as the model system. The column was operated under atmospheric pressure and total reflux conditions. The results showed that the two types of packing had excellent mass transfer performance within the gas phase load measured by the experiment, and the theoretical plate was at least 5 pieces per meter. The SiC-SCFP displayed a better mass transfer performance than Si-SiC-SCFP. With the increase of porosity, the mass transfer performance of Si-SiC-SCFP decreased, while the performance of Si-SCFP was improved. The increase of compression ratio was beneficial to the mass transfer performance of Si-SCFP. In terms of pressure drop performance, the operating pressure drop of the six packings all increased with the gas phase load, but there was little difference between them. At the same time, the liquid flow on the surface of the SCFP packing sheet was conducted, and the wetting area and transverse wetting length of liquid on different packing surfaces were compared. The packing sheet with higher mass transfer efficiency had better liquid wetting effect on the surface, with larger wetting area and longer transverse wetting length.

Key words: silicon carbide (SiC), foam ceramic, distillation, structured packing, hydrodynamic, mass transfer efficiency

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