中空纤维膜极化系数影响因素分析

耿雷铭; 张瑞华; 刘卫华

doi:10.13224/j.cnki.jasp.20220087

中空纤维膜极化系数影响因素分析

doi: 10.13224/j.cnki.jasp.20220087

耿雷铭^1,,
张瑞华^2,,
刘卫华^2,*, ,

1.
中航通飞华南飞机工业有限公司，广东珠海 519030
2.
南京航空航天大学航空学院飞行器环境控制与生命保障工信部重点实验室，南京 210016

基金项目: 国家自然科学基金民航联合基金（U1933121）；江苏省科研与实践创新计划（KYCX19_0198）；中央高校基本科研业务费专项资金（NC2020001）；江苏高校优势学科建设工程

详细信息

作者简介:
耿雷铭（1987-），男，高级工程师，博士生，主要从事运输类飞机适航技术研究。E-mail：fredgeng@163.com

通讯作者:
刘卫华（1965-），男，教授，博士，主要从事飞行器环境与生命保障工程、飞行器燃油系统研究。E-mail：liuwh@nuaa.edu.cn

中图分类号: V217；TQ138
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出版历程
- 收稿日期: 2022-02-25
- 网络出版日期: 2024-12-04

Influencing factors of polarization coefficient of hollow fiber membrane

GENG Leiming^1
,,
ZHANG Ruihua^2
,,
LIU Weihua^{2,*
, ,}

1.
General Huanan Aircraft Industry Company Limited，Aviation Industry Corporation of China，Limited，Zhuhai Guangdong 519030，China
2.
Key Laboratory of Aircraft Environmental Control and Life Support Industry and Information Technology，College of Aerospace Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

摘要

摘要:
以氧氮分离为研究对象，通过建立中空纤维膜气体分离数学模型，分析丝内外压差、进气初始氧体积分数、进气流量、丝外侧背压等参数对极化系数的影响，以探究操作参数对浓差极化影响程度，并提出降低浓差极化技术方案。研究表明：在考虑丝内压降、浓差极化现象的情况下，所建立的中空纤维膜气体分离数学模型具有一定的可信度；丝内外压差、进气初始氧体积分数、进气流量、丝外侧背压等因素对极化系数有一定影响，其中极化系数与丝内外压差、进气初始氧体积分数、丝外侧背压呈正相关，与进气流量呈负相关；可采用渗透侧负压抽吸方式提高膜透过流量、降低浓差极化。
- 中空纤维膜 /
- 气体分离 /
- 浓差极化 /
- 极化系数 /
- 氧氮分离
Abstract:
The study of concentration polarization, and the analysis of its influencing factors and mechanism are theoretical basis for improving the performance of hollow fiber membrane and the separation efficiency. By establishing a mathematical model of hollow fiber membrane separation of oxygen and nitrogen, the influences of parameters, such as pressure difference between the inside and outside of the filament, initial oxygen concentration of intake air, intake air flow rate and back pressure outside the filament on the polarization coefficient, were analyzed to explore the influence degree of operating parameters on the concentration polarization, and a technical scheme was put forward to reduce the concentration polarization. Factors such as pressure difference between the inside and outside of the filament, initial oxygen concentration of intake air, intake air flow rate, and back pressure outside the filament had a certain effect on the polarization coefficient, among them, the polarization coefficient was positively correlated with pressure difference inside and outside of the filament, initial oxygen concentration of intake air, and back pressure outside the filament, and was negatively correlated with intake air flow. Negative pressure suction on the permeation side can be used to increase the membrane permeation flow rate and reduce the concentration polarization. The influence of concentration polarization on membrane performance was reduced by controlling various factors.
- hollow fiber membrane /
- gas separation /
- concentration polarization /
- polarization coefficient /
- separation of oxygen and nitrogen

HTML

图 1 中空纤维膜内部流型示意图

Figure 1. Schematic diagram of internal current models of hollow fiber membrane

下载: 全尺寸图片幻灯片

图 2 氧分压在膜组件截面轴向的分布

Figure 2. Axial distribution of oxygen partial pressure in the section of membrane module

下载: 全尺寸图片幻灯片

图 3 计算值与实测值对比结果

Figure 3. Comparison results of calculated values and measured values

下载: 全尺寸图片幻灯片

图 4 浓差极化系数随膜内外压差的变化规律

Figure 4. Variation of concentration polarization coefficient with the pressure difference inside and outside the filament

下载: 全尺寸图片幻灯片

图 5 浓差极化系数随组分1初始进气体体积分数的变化

Figure 5. Variation of concentration polarization coefficient with the initial intake concentration of component 1

下载: 全尺寸图片幻灯片

图 6 浓差极化系数随原料气流量的变化规律

Figure 6. Variation of concentration polarization coefficient with the feed gas flow rate

下载: 全尺寸图片幻灯片

图 7 浓差极化系数随丝外侧背压的变化规律

Figure 7. Variation of concentration polarization coefficient with the inlet pressure in filament

下载: 全尺寸图片幻灯片

表 1 实验数据与微分数学模型计算结果对比

Table 1. Comparison of experimental data with calculated results of differential mathematical model

序号	操作条件				x_l/%
序号	p_i/10⁵ Pa	T/K	u_l/（kg/h）	x₀/%	实验值	计算值1	计算值2
1	4	303.15	20	21	7.63	7.52	8.04
2	4	323.15	20	21	6.78	6.75	7.21
3	4	343.15	20	21	6.26	6.20	6.63
4	4	363.15	20	21	6.05	6.01	6.42
5	4	383.15	20	21	5.83	5.84	6.24
6	6	303.15	20	21	5.34	5.31	5.74
7	6	323.15	20	21	4.35	4.30	4.64
8	6	343.15	20	21	4.00	3.95	4.25
9	6	363.15	20	21	3.95	3.87	4.17
10	6	383.15	20	21	4.16	4.12	4.45
注：计算值1为考虑浓差极化的情况，计算值2为不考虑浓差极化的情况。

下载: 导出CSV

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