Numerical simulation of mono-disperse droplet spray dryer under influence of swirling flow

doi:10.11949/j.issn.0438-1157.20180483

CIESC Journal ›› 2018, Vol. 69 ›› Issue (9): 3814-3824.DOI: 10.11949/j.issn.0438-1157.20180483

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Numerical simulation of mono-disperse droplet spray dryer under influence of swirling flow

YANG Shujun¹, WEI Yucong¹, WOO Meng Wai², WU Winston Duo¹, CHEN Xiao Dong^1,2, Xiao Jie¹

1. China-Australia Joint Research Center in Future Dairy Manufacturing, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China;
2. Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton Campus, Victoria, Australia

Received:2018-05-07 Revised:2018-06-24 Online:2018-09-05 Published:2018-09-05
Supported by:
supported by the Natural Science Foundation of Jiangsu Province (BK20170062), the National Key Research and Development Program of China (ISTCP, 2016YFE0101200, 2017YFD0400905), the National Natural Science Foundation of China (21406148), the Jiangsu ShuangChuang Program the Jiangsu Specially-Appointed Professors Program, and the Jiangsu PAPD.

入口旋流对均一粒径液滴喷雾干燥塔影响的数值模拟

杨树俊¹, 魏玉聪¹, Woo Meng Wai², 吴铎¹, 陈晓东^1,2, 肖杰¹

1. 苏州大学材料与化学化工学部化工与环境工程学院, 中澳乳品未来技术联合研究中心, 江苏苏州 215123;
2. 莫纳什大学化工系, 澳大利亚

通讯作者: 肖杰
基金资助:
江苏省自然科学基金优秀青年基金项目（BK20170062）；国家重点研发计划项目（2016YFE0101200，2017YFD0400905）；国家自然科学基金青年项目（21406148）；江苏双创计划项目；江苏特聘教授计划项目；江苏优势学科PAPD。

Abstract

Abstract:

Monodisperse droplet spray dryer (MDSD) has demonstrated great advantages in the production of uniform sized particle products. The drying performance of such facility is improved. By resorting to the discrete phase model (DPM) and the reaction engineering approach (REA) based on drying model, a 3D CFD model is developed to describe a complete MDSD consisting of a small droplet pre-dispersion chamber and a big drying chamber. The model allows to investigate the influence of introducing swirling flows in the pre-dispersion chamber and the drying chamber on particle trajectory and drying dynamics. It is shown that the introduction of the swirling flow at an air inlet angle of 30° can offer decent performance. When both chambers have swirling flows, the co-current scheme is 2% better than the counter-current scheme in terms of reaching lower particle moisture content. Compared with the case without any swirling flow, the particle moisture content can be 30% lower. To achieve the same moisture content, with the introduction of the swirling flow, the dryer can be shortened by nearly 12%.

Key words: mono-disperse droplet spray dryer, discrete phase model, reaction engineering approach based drying model, optimization, multiphase flow

摘要：

均一粒径液滴喷雾干燥塔（MDSD）在生产均匀尺寸颗粒产品中发挥着较大优势，进一步优化其干燥过程操作尤为重要。集成离散相（DPM）和反应工程法（REA）干燥方法，通过耦合分散室和主干燥室模型，本研究开发了完整的MDSD三维计算流体力学模型。并系统探究了在干燥过程中分散气旋流、热空气旋流以及二者共同旋流对颗粒运动和最终干燥效果的影响。模拟结果表明，在30°入射角下加入旋流效果最优。同时引入分散室和干燥室旋流后发现，同向旋流比反向旋流带来的干燥效果提升2%，更比无旋流操作下的干燥效果提升30%。欲达到同样的干燥效果，引入同向旋流，塔身可缩短近12%。

关键词: 均一粒径液滴喷雾干燥塔, 离散相模型, 反应工程法干燥模型, 优化, 多相流

CLC Number:

TQ02

YANG Shujun, WEI Yucong, WOO Meng Wai, WU Winston Duo, CHEN Xiao Dong, Xiao Jie. Numerical simulation of mono-disperse droplet spray dryer under influence of swirling flow[J]. CIESC Journal, 2018, 69(9): 3814-3824.

杨树俊, 魏玉聪, Woo Meng Wai, 吴铎, 陈晓东, 肖杰. 入口旋流对均一粒径液滴喷雾干燥塔影响的数值模拟[J]. 化工学报, 2018, 69(9): 3814-3824.

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Numerical simulation of mono-disperse droplet spray dryer under influence of swirling flow

入口旋流对均一粒径液滴喷雾干燥塔影响的数值模拟

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