Numerical simulation for water deoxygenation in rotating packed bed

doi:10.3969/j.issn.0438-1157.2014.07.040

CIESC Journal ›› 2014, Vol. 65 ›› Issue (7): 2785-2792.DOI: 10.3969/j.issn.0438-1157.2014.07.040

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Numerical simulation for water deoxygenation in rotating packed bed

XIANG Yang¹, LIU Liang¹, CHU Guangwen¹, ZOU Haikui¹, CHEN Jianfeng^1,2

1. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
2. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China

Received:2014-03-31 Revised:2014-04-04 Online:2014-07-05 Published:2014-07-05
Supported by:
supported by the National Natural Science Foundation of China (21206003) and the National High Technology Research and Development Program of China (2012AA063104).

超重力旋转填充床氧解吸过程的数值模拟

向阳¹, 刘良¹, 初广文¹, 邹海魁¹, 陈建峰^1,2

1. 北京化工大学教育部超重力工程研究中心, 北京 100029;
2. 北京化工大学有机无机复合材料国家重点实验室, 北京 100029

通讯作者: 陈建峰, 向阳
基金资助:
国家自然科学基金项目（21206003）；国家高技术研究发展计划项目（2012AA063104）。

Abstract

Abstract: A mathematical model for gas-liquid interphase mass transfer was established based on the visual study of fluid flow in a rotating packed bed (RPB). The effects of model parameters on liquid mass transfer coefficient k_L, as well as the effect of operation parameters on overall volumetric mass transfer coefficient K_La in gas-liquid mass transfer process of water deoxygenation by a nitrogen stream were studied via numerical simulations with the mathematical model. Simulation results indicated that k_L increased with decreasing liquid residence time and increasing liquid molecular diffusivity. K_La increased with increasing higee (high gravity) factor, temperature and liquid flow rate but influenced hardly by pressure, and decreased slightly with increasing gas flow rate. Additionally, the mass transfer contribution of cavity zone diminished with increasing higee factor, as well as decreasing cavity zone volume. According to numerical simulation results, the nature of process intensification for gas-liquid mass transfer process in RPB lay in transient liquid residence time. Deoxygenation efficiency E calculated from this model agreed well with experimental E extracted from literatures with deviations within ±16%, which verified the mass transfer model.

Key words: rotating packed bed, model, numerical simulation, mass transfer coefficient, water deoxygenation

摘要： 基于旋转填充床流体流动的可视化结果，建立了超重力旋转填充床气液传质过程的数学模型，模拟氮气解吸水中溶解氧的传质过程。模拟结果表明，缩短液相停留时间、提高液相扩散系数都能增大液相传质分系数k_L；总体积传质系数K_La随超重力因子的增加而增大、随温度的上升而增大、随气相流率的增加略有下降、随液相流率的增加明显增大；空腔区传质贡献率随空腔区的增大而增大，随超重力因子的增大而减小；且短暂的停留时间是超重力旋转填充床对传质过程强化的本质原因。模型较好地符合文献的实验数据，误差在±16%以内。

关键词: 旋转填充床, 模型, 数值模拟, 传质系数, 氧解吸

CLC Number:

TQ028.8

XIANG Yang, LIU Liang, CHU Guangwen, ZOU Haikui, CHEN Jianfeng. Numerical simulation for water deoxygenation in rotating packed bed[J]. CIESC Journal, 2014, 65(7): 2785-2792.

向阳, 刘良, 初广文, 邹海魁, 陈建峰. 超重力旋转填充床氧解吸过程的数值模拟[J]. 化工学报, 2014, 65(7): 2785-2792.

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Numerical simulation for water deoxygenation in rotating packed bed

超重力旋转填充床氧解吸过程的数值模拟

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