1. Institute of Flow Induced Corrosion,Zhejiang Sci-Tech University,Hangzhou　 310018,China;2. Ordos Coal Oil Company of China Shenhua Oil-coal to Liquid and Chemical Company Limited,Shenhua Group Corporation Limited,Ordos　 017000,China

以煤直接液化工艺过程中热高压分离器(简称"热高分")内的颗粒漂移为研究对象,建立带静态分离挡板的热高分物理模型,并采用VOF(Volume of Fluid)模型和DPM(Discrete Phase Model)模型,数值分析静态分离挡板5种倾斜角度下热高分罐内部速度场、不同液位高度颗粒平均浓度及气相出口煤粉漂移率的分布规律。研究结果表明:静态分离挡板的倾斜角度对速度场的影响明显,在挡板附近区域形成小回流涡旋效应,产生对颗粒随气流夹带提升的抑制作用;颗粒平均浓度在气-液交界面区域最高,随着热高分罐内高度的增加而逐渐降低;与其余倾斜角度相比,α=45°时气相出口的颗粒漂移率达到最小,较未设置分离挡板时,颗粒漂移率降低50%以上。研究有望为热高压分离压力容器的设计和运行优化提供参考。

To study the pulverized coal drifting in high temperature and high pressure (HTHP) separator in coal lique- faction unit,the physical model of HTHP separator with static separation baffles was established. The volume of fluid (VOF) model and the discrete phase model (DPM) were used in this numerical simulation to analyze the distribution regularities of interior velocity field,the averaged particles concentration in different heights and the pulverized coal drifting ratio in gas phase outlet with five kinds of baffle tilt angles. The results show that the tilt angle of separation baffles has a great influence on the velocity field,the vortex effect occurs near the baffles;the mean particles concen- tration becomes maximum in the area of gas-liquid interface,then decreases gradually with the increase of height;the pulverized coal drifting ratio in gas phase outlet reaches minimum if the tilt angle is 45°,which can reduce more than 50% compared to no static separation baffles. The research results can provide a valuable reference for optimizing the design and operation in HTHP separator.

国家自然科学基金委员会-神华集团有限公司煤炭联合基金资助项目(U1361107)；高等学校博士学科点专项科研基金资助课题资助项目(20133318120004)；浙江理工大学521人才培养计划资助项目；

Jin Haozhe,Chen Xiaoping,Zheng Zhijian,et al. Numerical simulation on the effect of different baffle tilt angles on particle drifting in high temperature and high pressure separator[J]. Journal of China Coal Society,2016,41(8):2092-2096.