In our previous experimental study, a novel multistage moving bed air reactor was proposed for chemical looping combustion; some operating mechanisms including the gas flow carrying capacity and gas leakage performance were investigated. In this paper, a quasi-2D computational fluid dynamics–discrete element model cold flow model is developed for the experimental air reactor. Effects of the operating parameters, geometric parameters, and internals on solids’ flow characteristics and residence time distributions are studied by using the tracer particles. Results show that with increase in the loop seal gas velocity, the solids’ mass flux increases and the average solids’ residence time decreases. The reactor angle has more influence in solids’ movements in the near-wall region, while the wedge angle has more effect on the solids’ movements in the lower part of the reactor. With decrease of the reactor angle, increase of the wedge angle, or increase of the down-comer diameter, the solids’ flow gets closer to ideal plug flow in the reactor. The internals can accelerate the particles in the near-wall region; internals in triangular arrays are better than those in square arrays to slow down the central particles.

中文翻译：

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化学循环燃烧移动床空气反应器中流动特性和固体停留时间分布的计算流体动力学离散元模型模拟

在我们之前的实验研究中，提出了一种用于化学循环燃烧的新型多级移动床空气反应器。研究了气体流动能力和气体泄漏性能的一些运行机理。在本文中，为实验空气反应堆开发了准二维计算流体动力学离散元模型冷流模型。使用示踪剂颗粒研究了操作参数，几何参数和内部参数对固体流动特性和停留时间分布的影响。结果表明，随着回路密封气体速度的增加，固体的质量通量增加，平均固体的停留时间减少。反应堆角度对固体在近壁区域的运动有更大的影响，而楔角对反应器下部固体的运动影响更大。随着反应器角度的减小，楔角的增加或下导管直径的增加，固体的流量更接近于反应器中的理想塞流。内部结构可以加速近壁区域中的颗粒；三角形阵列的内部比方形阵列的内部要好，以减慢中心粒子的速度。