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

doi:10.16085/j.issn.1000-6613.2022-1213

摘要/Abstract

摘要：

在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

中图分类号:

TQ02

陈伟良, 高鑫, 李洪, 李鑫钢. 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[J]. 化工进展, 2023, 42(5): 2289-2297.

CHEN Weiliang, GAO Xin, LI Hong, LI Xingang. Influence mechanism of skeleton structure of foamed SiC corrugated structured packing on the mass transfer performance[J]. Chemical Industry and Engineering Progress, 2023, 42(5): 2289-2297.

图/表 11

表1 泡沫碳化硅波纹规整填料的结构参数

名称	填料尺寸 /mm	填料片尺寸 /mm	类型	通孔率 /%	泡棉厚 /mm
SCFP-1-71*6.5	ϕ100×100	200×100	富硅型	71	6.5
SCFP-1-65*6.5	ϕ100×100	200×100	富硅型	65	6.5
SCFP-1-61*6.5	ϕ100×100	200×100	富硅型	61	6.5
SCFP-2-71*6.5	ϕ100×100	200×100	纯质	71	6.5
SCFP-2-65*6.5	ϕ100×100	200×100	纯质	65	6.5
SCFP-2-61*7.5	ϕ100×100	200×100	纯质	61	7.5

图1 填料示意图

图2 传质性能实验测试流程1—塔釜压力表；2—空塔段；3—填料段；4—塔顶热电偶；5—塔顶真空表；6—冷凝器进水口；7—不凝性气体排出阀；8—冷凝器出水口；9—回流热电偶；10—转子流量计；11—回流液采样阀；12—塔顶液体分布器；13—塔釜采样阀；14—塔釜热电偶；15—回流采出阀；16—回流采出罐

图3 单片波纹填料片上液体流动行为装置1—水槽；2—蠕动泵；3—调节阀；4—转子流量计；5—高速摄影机；6—紫外光灯；7—滴管；8—铁夹；9—波纹填料片；10—铁架台

图4 HETP随气相负荷因子F的变化趋势

图5 两种不同类型填料的HETP随气相负荷因子F的变化趋势

图6 两种不同压缩比的纯质碳化硅填料的HETP

图7 6种填料的操作压降

图8 液体横向扩散长度

图9 不同流量下5种填料的横向润湿长度

图10 不同流量下填料的表面润湿面积

参考文献 16

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