【摘要】 流体沿催化剂床层轴向高度均匀分布是丁烯氧化脱氢径向床反应器保持较高性能的必要条件。应用计算流体力学(CFD)软件对径向床反应器内的流场进行三维数值模拟计算,分别考察影响π型反应器和z型反应器内流场均布的关键因素。结果表明:高径比越小,π型反应器内流体分布越均匀,综合压降方面的考虑,高径比选10为最佳;内外流道截面积比对π型反应器的性能影响显著,当取值在1/3—1/2区间时,流场均布情况较好。提出了一种z型反应器内导流锥的设计方法,适当尺寸的导流锥引入明显改善了z型反应器内的流体均布程度。更多还原

【Abstract】 The operating efficiency of a radial flow reactor for the oxidative dehydrogenation of butane to butadiene largely depends on the fluid distribution over the catalyst bed height. The three-dimensional numerical simulation of the flow field within the radial flow reactor was calculated by CFD. The key factors that ensure a uniform flow distribution in the π-flow type and z-flow type reactors were studied. The results show that the small ratio of height to diameter can provide a better uniform distribution of the fluid in the π-flow type radial flow reactor,and the best ratio of height to diameter turns out to be 10 by taking both the theory and the engineering problems into consideration; the cross-sectional area ratio of central pipe to annular channel has a significant effect on the performance of the π-flow type reactor and the best value is in the range of 1/3-1/2. A guiding cone was designed which can significantly improve the uniformity of the flow distribution in the z-flow type reactor.更多还原