HD低温蒸发系统中填料蒸发器传质传热的分析

doi:10.16085/j.issn.1000-6613.2018-1462

化工进展 ›› 2019, Vol. 38 ›› Issue (05): 2132-2141.DOI: 10.16085/j.issn.1000-6613.2018-1462

HD低温蒸发系统中填料蒸发器传质传热的分析

袁惠新^1,²(),雒维文^1,²,付双成^1,²,陆明佳^1,²,丁南华³

1. 常州大学机械工程学院，常州大学-新纪元环保装备研究院，江苏常州 213164
2. 江苏省绿色过程装备重点;实验室(常州大学)，江苏常州 213164
3. 江苏新纪元环保有限公司，江苏宜兴 214214

收稿日期:2018-07-14 修回日期:2018-10-18 出版日期:2019-05-05 发布日期:2019-05-05
作者简介:信作者：<named-content content-type="corresp-name">袁惠新</named-content>（1957—），男，教授，博士生导师，研究方向为分离工程。E-mail: <email>yuanhuixin2016@163.com</email>。
基金资助:
中小企业发展专项资金中欧国际合作项目(国科外[2014]163号-49);江苏省科技支撑计划(SBE201470489)

Analysis of mass and heat transfer process of packing evaporator in HD low temperature evaporation system

Huixin YUAN^1,²(),Weiwen LUO^1,²,Shuangcheng FU^1,²,Mingjia LU^1,²,Nanhua DING³

1. School of Mechanical Engineering and Institute of New Epoch Environmental Protection Equipment Research of Changzhou University，Changzhou 213164，Jiangsu，China
2. Jiangsu Key Laboratory of Green Process Equipment，Changzhou University，Changzhou 213164，Jiangsu，China
3. Jiangsu New Epoch Environmental Protection Company Limited，Yixing 214214，Jiangsu，China

Received:2018-07-14 Revised:2018-10-18 Online:2019-05-05 Published:2019-05-05

摘要/Abstract

摘要：

通过研究系统中填料蒸发器的蒸发传质传热过程以及两相流动特性，采用计算流体力学（computational fluid dynamics，CFD）中离散相与连续相耦合的方法来模拟规整填料内部通道的蒸发传质传热过程，实现了填料蒸发器中两相传质传热的过程以及液滴流动的可视化，为研究气液两相在规整填料内的流动提供了一种模拟方法。通过与实验结果的比较，最终选用RNG k-ε湍流模型来分析规整填料内部气液两相传质传热以及流动情况。数值模拟研究了规整填料板间距对填料内部气液两相传质传热以及液滴运动影响，发现随着板间距的增大，填料内部压力降逐渐降低，出口空气中水蒸气的含量不断减小，液滴蒸发速率降低，液滴进出口质量差减小，气相出口温度逐渐降低，蒸发传质传热效率降低。随着气速的增大，出口空气中水蒸气的含量不断减小，液滴蒸发速率增加，气相出口温度降低，气液两相传质传热效率降低。

关键词: 填料蒸发器, 规整填料, 数值模拟, 板间距, 传质传热

Abstract:

In this paper, the evaporative mass and heat transfer process and the two-phase flow characteristics of the packing evaporator were studied. The method of coupling discrete and continuous phases in computational fluid dynamics (CFD) was used to simulate mass and heat transfer of the evaporative process in the internal channels of the structured packing. The two-phase mass and heat transfer process in the packing evaporator and visualization of the droplet flow were realized. A new simulation method for studying the flow of gas-liquid two-phase in structured packing was provided. By comparing with the experimental results, the turbulence model of RNG k-ε was determined, and the mass and heat transfer and flow of gas-liquid two-phase inside the structured packing were analyzed. By changing the plate spacing of structured packing, the effect of gas-liquid two-phase mass and heat transfer and droplet movement inside the packing was simulated and analyzed. It was found that with the increase of plate spacing, the pressure drop inside the packing was gradually reduced, the content of water vapor in the outlet air was continuously reduced, the evaporation rate of the droplets was reduced, the difference between the droplet inlet and outlet quality was reduced, and the temperature at the outlet of the gas phase decreased. The efficiency of evaporation of mass transfer and heat transfer decreased. As the gas velocity increases, the content of water vapor in the outlet air decreased, the evaporation rate of the droplet increased, and the temperature at the outlet of the gas phase decreased. The efficiency of evaporation of mass transfer and heat transfer in gas-liquid two-phase decreased.

Key words: packing evaporator, structured packing, numerical simulation, plate spacing, mass and heat transfer

中图分类号:

TQ028

袁惠新, 雒维文, 付双成, 陆明佳, 丁南华. HD低温蒸发系统中填料蒸发器传质传热的分析[J]. 化工进展, 2019, 38(05): 2132-2141.

Huixin YUAN, Weiwen LUO, Shuangcheng FU, Mingjia LU, Nanhua DING. Analysis of mass and heat transfer process of packing evaporator in HD low temperature evaporation system[J]. Chemical Industry and Engineering Progress, 2019, 38(05): 2132-2141.

图/表 18

图1 规整填料三维物理模型

图2 规整填料流体通道

表1 波纹板填料尺寸

波纹板填料参数	尺寸数值
填料长度/mm	250
填料宽度/mm	250
板间距/mm	1.25
波宽2B/mm	8
波高h/mm	5

图3 气液两相逆流模型图

图4 6种模拟结果和实验结果对比

表2 6种模拟值误差比较

水蒸气含量/g?kg^-1	误差/%
水蒸气含量/g?kg^-1	standard $k - ε$ +SWF	RNG $k - ε$ +SWF	realizable $k - ε$ +SWF	standard $k - ε$ +EWT	RNG $k - ε$ +EWT	realizable $k - ε$ +EWT
2.65	3.958	3.278	3.927	3.293	3.233	3.293
2.77	0.287	0.014	0.287	0.086	0.086	0.086
2.98	0.304	0.359	0.331	0.470	0.414	0.470
3.11	3.179	3.179	3.179	3.207	3.207	3.207
3.69	1.455	1.350	1.479	1.338	1.338	1.362
平均误差	1.837	1.636	1.841	1.679	1.656	1.683

表2 6种模拟值误差比较

水蒸气含量/g?kg^-1	误差/%
水蒸气含量/g?kg^-1	standard $k - ε$ +SWF	RNG $k - ε$ +SWF	realizable $k - ε$ +SWF	standard $k - ε$ +EWT	RNG $k - ε$ +EWT	realizable $k - ε$ +EWT
2.65	3.958	3.278	3.927	3.293	3.233	3.293
2.77	0.287	0.014	0.287	0.086	0.086	0.086
2.98	0.304	0.359	0.331	0.470	0.414	0.470
3.11	3.179	3.179	3.179	3.207	3.207	3.207
3.69	1.455	1.350	1.479	1.338	1.338	1.362
平均误差	1.837	1.636	1.841	1.679	1.656	1.683

图5 填料通道内的相对湿度分布云图

图6 x=5mm面通道内压力分布云图

图7 x=5mm横截面波纹通道面上速度云图

图8 z=125mm纵截面通道内部局部速度云图

图9 填料内部气相温度云图

图10 x中间面不同板间距的填料通道内气相速度云图

图11 不同板间距的填料通道内液滴质量迹线图变化

图12 不同板间距与液滴进出口质量差的关系

图13 不同气相速度下填料内部压力降随板间距的变化

图14 不同气相速度下出口空气中水蒸气含量随板间距变化

图15 不同气相速度下填料内液滴蒸发速率随板间距的变化

图16 不同气相速度下填料内空气出口温度随板间距的变化

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HD低温蒸发系统中填料蒸发器传质传热的分析

Analysis of mass and heat transfer process of packing evaporator in HD low temperature evaporation system

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