Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed

›› 2011, Vol. 19 ›› Issue (5): 738-746.

Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed

许闽, 刘辉, 李成岳, 周媛, 季生福

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2011-06-11 修回日期:2011-08-25 出版日期:2011-10-28 发布日期:2011-10-28
通讯作者: LIU Hui,E-mail:hliu@mail.buct.edu.cn
基金资助:
Supported by the State Key Development Program for Basic Research of China (2006CB202503)

Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed

XU Min, LIU Hui, LI Chengyue, ZHOU Yuan, JI Shengfu

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2011-06-11 Revised:2011-08-25 Online:2011-10-28 Published:2011-10-28
Supported by:
Supported by the State Key Development Program for Basic Research of China (2006CB202503)

摘要/Abstract

摘要： With a particular focus on the connection between liquid flow distribution and gas-liquid mass transfer in monolithic beds in the Taylor flow regime, hydrodynamic and gas-liquid mass transfer experiments were carried out in a column with a monolithic bed of cell density of 50 cpsi with two different distributors (nozzle and packed bed distributors). Liquid saturation in individual channels was measured by using self-made micro-conductivity probes. A mal-distribution factor was used to evaluate uniform degree of phase distribution in monoliths. Overall bed pressure drop and mass transfer coefficients were measured. For liquid flow distribution and gas-liquid mass transfer, it is found that the superficial liquid velocity is a crucial factor and the packed bed distributor is better than the nozzle distributor. A semi-theoretical analysis using single channel models shows that the packed bed distributor always yields shorter and uniformly distributed liquid slugs compared to the nozzle distributor, which in turn en-sures a better mass transfer performance. A bed scale mass transfer model is proposed by employing the single channel models in individual channels and incorporating effects of non-uniform liquid distribution along the bed cross-section. The model predicts the overall gas-liquid mass transfer coefficient with a relative error within ±30%.

关键词: monoliths, flow distribution, gas-liquid mass transfer, Taylor flow, single-channel

Abstract: With a particular focus on the connection between liquid flow distribution and gas-liquid mass transfer in monolithic beds in the Taylor flow regime, hydrodynamic and gas-liquid mass transfer experiments were carried out in a column with a monolithic bed of cell density of 50 cpsi with two different distributors (nozzle and packed bed distributors). Liquid saturation in individual channels was measured by using self-made micro-conductivity probes. A mal-distribution factor was used to evaluate uniform degree of phase distribution in monoliths. Overall bed pressure drop and mass transfer coefficients were measured. For liquid flow distribution and gas-liquid mass transfer, it is found that the superficial liquid velocity is a crucial factor and the packed bed distributor is better than the nozzle distributor. A semi-theoretical analysis using single channel models shows that the packed bed distributor always yields shorter and uniformly distributed liquid slugs compared to the nozzle distributor, which in turn en-sures a better mass transfer performance. A bed scale mass transfer model is proposed by employing the single channel models in individual channels and incorporating effects of non-uniform liquid distribution along the bed cross-section. The model predicts the overall gas-liquid mass transfer coefficient with a relative error within ±30%.

Key words: monoliths, flow distribution, gas-liquid mass transfer, Taylor flow, single-channel

许闽, 刘辉, 李成岳, 周媛, 季生福. Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed[J]. , 2011, 19(5): 738-746.

XU Min, LIU Hui, LI Chengyue, ZHOU Yuan, JI Shengfu. Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed[J]. , 2011, 19(5): 738-746.

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Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed

Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed

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