摘要
采用欧拉法对环流反应器中气-液-固三相流动进行计算流体力学模拟研究,通过氧气-水-催化剂冷态实验体系的实验数据验证模型与参数。实验结果表明,反应器环隙区域液相环流的主要推动力为反应器中心气流上升造成的套管内外压力差。从操作条件优化和反应器设计角度,提出提高环隙区域气含率的两种方法——增大环隙套管内外压力差和降低气泡直径。结合实验工况探索了不同气流量下反应器内流体流动状态,为优化热态反应器操作提供理论依据。
Computational fluid dynamics(CFD) simulation was conducted to study hydrodynamic behaviors of gas-liquid-solid flow in a loop reactor by Euler method. Models and parameters were validated by the experimental data of oxygen-water-catalyst cold experimental system. It was showed that the liquid circulation in the annulus zone of the reactor was mainly driven by the difference of the pressure inside and outside the sleeve,which was caused by the gas upflow in the core zone. From reactor design and operation optimization,two methods were put forward to improve gas holdup of annular zone,which were increasing difference of annular sleeve interior pressure and exterior pressure and decreasing the bubble diameter. Furthermore,gas flow conditions with different gas flow were explored combining with the experiment to provide theoretical basis for optimizing the operation of thermal reactor.
引文
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