新型水旋風分離器之研究暨水旋風分離器粒子流動之模擬

Study of a new type hydrocyclone and simulation of particle fluid in a hydrocyclone

賴詠聖(Yung-Sheng Lai)

指導教授 ： 吳容銘

淡江大學/工學院/化學工程與材料工程學系碩士班/碩士(2010年)

https://doi.org/10.6846/TKU.2010.00725

摘要

本研究採用直徑45 mm之水旋風分離器，分別進行實驗和模擬的分析，實驗方面使用馬鈴薯澱粉為粉體，討論不裝葉片與加裝不同葉片大小之影響，採用分析溢流與底流之粒徑分佈及分級效率，模擬方面以多相流VOF模式與紊流LES模式模擬空氣核心並分析流場流態，並模擬粒子在不同壁厚的伸入水旋風分離器之溢流管的流動情形。 實驗結果顯示，葉片會將0-40 微米粒子掃向水旋風分離器之內壁，使0-40 微米粒子的分級效率有明顯提高，且在高分流比與高進口端壓力下，可以使用較長與較高之葉片，可獲得更好的小粒徑粒子之分級效率，模擬部分發現當伸入水旋風分離器之溢流管越薄有越好的分級效率，但分流比0.72時1.5 mm壁厚反而會使0-35 微米粒子的分級效率變差，根據模擬結果，欲收集澄清液可使用適當的薄壁，欲分離大小粒徑可使用適當的厚壁。

關鍵字

水旋風分離器 ； 粒子模擬

並列摘要

In this study, we use 45 mm diameter hydrocyclone to experiment and simulation. In the experiment, we used potato starch as particles to realize its classification. The effects of variations in overflow diameter and underflow diameter on particle size distribution and separation efficiency were analyzed. In the simulation, the air core was simulated successfully by VOF model and LES model, and simulation particle fluid situation in different thickness vortex finder wall which is entering the hydrocyclone.
According to experiment results, the experiment results show that the vane will sweep 0-40 micrometer particle size to the inside wall of hydrocyclone. Let will enable the 0-40 micrometer size of the separation efficiency to have the distinct enhancement. In high flow split to and high inlet pressure, use longer and higher vane, can enable the small particle size of the separation efficiency better. In the simulation, can find thinner vortex finder wall which is entering the hydrocyclone have better separation efficiency. But in flow split 0.72, the 1.5 mm wall will cause 0-35 micrometer particle size of the separation efficiency worse. According to simulation results, use the suitable thin wall to collect clear fluid, use the suitable thick wall to separate the size of particle.

並列關鍵字

Hydrocyclone ； CFD ； Simulation

參考文獻

吳文豪 (2005) “操作條件與幾何結構對水旋風分離器之分離效率的影響”，碩士學位論文，淡江大學化學工程與材料工程學系

陳怡任 (2008) “水旋風分離器流場測量與模擬暨新型水旋風分離器之研究”，碩士學位論文，淡江大學化學工程與材料工程學系

許智淵 (2008) “水旋風分離器之研究與薄膜水旋風分離之發展”，碩士學位論文，淡江大學化學工程與材料工程學系

呂信毅 (2006) “改進複合型水旋風分離器之分離效率”，碩士學位論文，淡江大學化學工程與材料工程學系

Ahmed, M. M., Ibrahim, G. A., and Farghaly, M. G. (2009) “Performance of a three-product hydrocyclone.” International Journal of Mineral Processing, 91, 34-40.