Prediction of solids residence time distribution in cross-flow bubbling fluidized bed
Prediction of solids residence time distribution in cross-flow bubbling fluidized bed
复制标题
错流鼓泡流化床中固体停留时间分布的预测
DOI：
10.1016/j.powtec.2017.07.085
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发表时间：
2017-10
影响因子：
5.2
通讯作者：
Liu Xiaoxing
中科院分区：
文献类型：
--
作者：
Geng Shujun;Qian Yanan;Zhan Jinhui;Zhang Hongling;Xu Guangwen;Liu Xiaoxing
错流鼓泡流化床广泛应用于化工循环和热循环等双流化床系统。了解固体颗粒在反应器中的停留特性，对反应器的优化设计具有重要意义。在此之前，我们用煤粉颗粒作为示踪剂，对错流矩形流化床中的停留时间分布进行了实验测量。采用多流体欧拉方法结合组分输运方程对固体RTD进行了计算研究，结果表明，煤颗粒的RTD可以正确地表示，模拟结果与实验数据吻合较好。参数研究表明，在所考虑的操作条件下，示踪剂注入时间对预测的固体停留时间的影响几乎是可忽略的。模拟结果表明，在所研究的错流BFB中，固体RTD与固体存量和固体通量密切相关。通过适当的数据处理，发现固体RTD曲线的下降段可以用经验指数函数唯一拟合。因此，一个半经验的方法，并进一步验证，在文献中第一次，来预测固体RTD的整个轮廓，其中固体RTD的轮廓的上升部分是通过CFD模拟得到的，而下降部分是由拟合的经验指数函数。
Cross-flow bubbling fluidized beds (BFBs) have been widely used in dual fluidized bed systems such as chemical and heat looping. Understanding the residence characteristics of solids in such system is important for better design and optimization of reactors. Previously we experimentally measured the residence time distributions (RTDs) of sands in a cross-flow rectangular BFB by using coal particles as tracer. A computational investigation of solids RTD using multi-fluid Eulerian method combined with the species transport equation showed that the RTD of sands could be correctly represented by that of coal particles, and the simulation results well agreed with experimental data. Parametric studies demonstrated that, under the considered operation conditions, the influence of tracer injection time period on the predicted solid residence times was nearly ignorable. Simulation results revealed that in the investigated cross-flow BFB the solids RTD is closely related to solids inventory and solids flux. Through proper data processing, it was found that the descending part of solids RTD profile can be uniquely fitted by an empirical exponential function. A semi-empirical approach was thus developed and further validated, for the first time in the literature, to predict the entire profile of solids RTD, in which the ascending part of solids RTD profile is obtained through CFD simulation whereas the descending part is given by the fitted empirical exponential function.
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影响因子：
4.7
作者：
Junwu Wang;van der M.A. Hoef;J. Kuipers
通讯作者：
Junwu Wang;van der M.A. Hoef;J. Kuipers
影响因子：
3.7
作者：
Yingjie Liu;Xingying Lan;Chunming Xu;Gangxiao Wang;Jinsen Gao
通讯作者：
Yingjie Liu;Xingying Lan;Chunming Xu;Gangxiao Wang;Jinsen Gao
DOI：
10.1016/j.cep.2007.01.023
发表时间：
2008-03
期刊：
Chemical Engineering and Processing
影响因子：
--
作者：
R. Andreux;G. Petit;M. Hemati;O. Simonin
通讯作者：
R. Andreux;G. Petit;M. Hemati;O. Simonin
影响因子：
4.7
作者：
Harris, AT;Davidson, JF;Thorpe, RB
通讯作者：
Thorpe, RB
影响因子：
3.7
作者：
M. Rhodes;S. Zhou;T. Hirama;H. Cheng
通讯作者：
M. Rhodes;S. Zhou;T. Hirama;H. Cheng