Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model
Three-dimensional simulation of dense suspension upflow regime in high-density CFB risers with EMMS-based two-fluid model
复制标题
基于 EMMS 的双流体模型三维模拟高密度 CFB 立管中的浓悬浮液上流流态
DOI：
10.1016/j.ces.2013.12.020
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发表时间：
2014-04
影响因子：
4.7
通讯作者：
Li, Jinghai
中科院分区：
文献类型：
--
作者：
Zhou, Quan;Wang, Junwu;Li, Jinghai
高密度循环流化床（CFB）中的密相悬浮上升流（DSU）与传统的快速流化相比，具有无向下颗粒通量和高平均固含率的显著优点，如固体返混少、固含率高。以往的CFD模拟大多局限于低密度循环流化床的快速流化区，难以再现DSU区的流体力学特性。在这项研究中，最近提出的基于EMMS的双流体模型（Wang等人，2012.化学工程科学75，349-358），其中富含颗粒的密相和富含气体的稀相被处理为两个互穿的连续体，而不是像标准的双流体模型中那样将气相和固相处理为互穿的连续体。大量的模拟已经进行，并与实验数据的比较表明，EMMS为基础的双流体模型有能力正确捕捉的DSU制度的主要特征。因此，本研究不仅进一步验证了基于EMMS的双流体模型的思想和可行性，而且为探索高密度循环流化床中DSU区域的流体动力学特性提供了新的可能性。
Dense suspension upflow (DSU) regime in high-density circulating fluidized bed (CFB) risers, featuring no downward particle flux and high mean solid holdup, offers significant advantages over conventional fast fluidization, such as much less solid backmixing and higher solid holdup. While most of the previous CFD simulations are limited to the regime of fast fluidization in low-density CFB risers, it is difficult to reproduce the hydrodynamics of DSU regime using CFD simulation. In this study, a recently proposed EMMS-based two-fluid model (Wang et al., 2012. Chem. Eng. Sci. 75, 349–358), where the particle-rich dense phase and gas-rich dilute phase are treated as the two interpenetrating continua instead of treating gas and solid phases as interpenetrating continua as in standard two-fluid models, is first modified and then used to study the hydrodynamics of high-density CFB risers. Extensive simulations have been performed, and the comparison with experimental data indicated that the EMMS-based two-fluid model had the ability to correctly capture main features of the DSU regime. Therefore, present study not only provided further validation of the idea and feasibility of EMMS-based two-fluid model, but also offered new possibility to explore the hydrodynamic characteristics of DSU regime in high-density CFB risers.
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