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采用大型冷模实验,结合多种现代多相流测试技术,考察了FCC提升管内催化剂和原料油的流动、混合状况。通过引入4个新参数:射流相无量纲特征浓度(反映射流的扩散速度)、颗粒密度分布均匀性指标(反映催化剂颗粒分布的均匀程度)、颗粒相返混比(反映催化剂颗粒的返混)和特征浓度剂油比(反映剂油的浓度“匹配”),定量比较了不同喷嘴出口射流速度对提升管内多相流场的影响。从优化提升管内油-剂流动、混合效果的角度出发,对进料雾化喷嘴的两个“外部矢量”进行了优化:一是喷嘴出口射流速度应控制在65~70 m/s,二是采用“气体内构件”来调控提升管内流场。工业应用的效果表明,进料雾化喷嘴“外部矢量”的优化切实有效。
A large-scale cold model test was used in combination with a variety of modern multi-phase flow test techniques to investigate the flow and mixing of catalyst and feedstock in the FCC riser. By introducing four new parameters, the non-dimensional characteristic concentration of the jet phase (reflecting the jet diffusion rate), the uniformity of the particle density distribution index (reflecting the uniformity of the catalyst particle distribution), the phase mixing ratio of the particles (reflecting the backmixing of the catalyst particles) And characteristic concentration ratio (reflectance oil concentration “match ”) were used to quantitatively compare the effect of jet velocity at different nozzle outlets on the multiphase flow field in the riser. From the perspective of optimizing the oil-agent flow and mixing effect in the pipe, the two “external vectors” of the atomizing atomizing nozzle are optimized: firstly, the jet velocity at the exit of the nozzle should be controlled at 65-70 m / s, The second is to use “gas components ” to regulate and enhance the flow field within the tube. The effect of industrial application shows that the optimization of feed atomizing nozzle “external vector ” is effective.