当前位置: X-MOL 学术Fuel Process. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A process scaling approach for CFD-DEM modelling of thermochemical behaviours in moving bed reactors
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.fuproc.2020.106369
Qinfu Hou , Dianyu E , Shibo Kuang , Aibing Yu

Abstract Intensive heat and mass transfer between continuum fluids and discrete particulate materials plays a critical role in many chemical reactors. The residence and chemical reactions of particulate materials could span over hours. To understand and improve the operation of these reactors, discrete particle models are very helpful and computationally demanding. Different to the previous coarse grain model in reducing computational cost by reducing total particle number with large representative particles, a scaling approach by changing process parameters and thus the time scale is established to significantly reduce computational cost for the combined computational fluid dynamics (CFD) and discrete element method (DEM) modelling of moving bed reactors. The scaled model is first derived based on the governing equations of mass, momentum and energy for two-phase flow and then applied to a moving bed reactor. The results in terms of flow, heat and mass transfer and chemical reactions with different time scaling factors demonstrate that two-order acceleration in terms of computational time can be achieved while reliably representing the same physical process. The possible use of the scaling approach to other systems is discussed. The scaling approach represents a critical step forward towards establishing virtual real-time thermochemical reactors with discrete particle models.

中文翻译:

移动床反应器中热化学行为的 CFD-DEM 建模的过程缩放方法

摘要 连续流体与离散颗粒材料之间的强传热传质在许多化学反应器中起着至关重要的作用。颗粒材料的滞留和化学反应可能会持续数小时。为了理解和改进这些反应器的运行,离散粒子模型非常有用且计算量很大。与之前的粗粒模型通过减少具有大代表性粒子的总粒子数来降低计算成本不同,通过改变工艺参数和时间尺度的缩放方法被建立,以显着降低组合计算流体动力学(CFD)和移动床反应器的离散元方法 (DEM) 建模。比例模型首先是基于质量控制方程推导出来的,两相流的动量和能量,然后应用于移动床反应器。具有不同时间比例因子的流动、传热和传质以及化学反应方面的结果表明,可以在计算时间方面实现二阶加速,同时可靠地表示相同的物理过程。讨论了缩放方法对其他系统的可能用途。缩放方法代表了朝着建立具有离散粒子模型的虚拟实时热化学反应器迈出的关键一步。具有不同时间比例因子的传热和传质以及化学反应表明,可以在计算时间方面实现二阶加速,同时可靠地表示相同的物理过程。讨论了缩放方法对其他系统的可能用途。缩放方法代表了朝着建立具有离散粒子模型的虚拟实时热化学反应器迈出的关键一步。具有不同时间比例因子的传热和传质以及化学反应表明,可以在计算时间方面实现二阶加速,同时可靠地表示相同的物理过程。讨论了缩放方法对其他系统的可能用途。缩放方法代表了朝着建立具有离散粒子模型的虚拟实时热化学反应器迈出的关键一步。
更新日期:2020-06-01
down
wechat
bug