CFD在丙烷脱氢流化床反应器中的应用

APPLICATION OF CFD IN FLUIDIZED BED REACTOR FOR PROPANE DEHYDROGENATION

针对某中试循环流化床装置中的丙烷脱氢反应器建立了三维多尺度CFD流动-传热-反应耦合模型,并采用该模型对丙烷脱氢反应器的操作工况进行了参数优化研究。所建立的三维多尺度CFD模型能够较准确地刻画丙烷脱氢在整个流化床反应器内的反应历程。通过参数优化研究获得丙烷脱氢反应器的最佳操作条件为:反应温度600℃,体积空速2 350h^(-1),催化剂装量0.8kg,催化剂平均粒径70μm。在此操作工况下,丙烷转化率为43.46%,丙烯选择性为85.66%,丙烯收率达37.24%。所建立的CFD模型能够用于丙烷脱氢流化床反应器的模拟、设计、放大与优化等过程。

A three-dimensional multi-scale CFD model was developed for a propane dehydrogenation reactor in a pilot-scale circulating fluidized bed device.By using the CFD model,sensitivity studies on operation conditions were conducted.Findings indicated that the 3D multi-scale CFD model could describe precisely the reaction paths occuring in the propane dehydrogenation reactor.Besides,the optimum operation conditions for the propane dehydrogenation was obtained:reaction temperature of 600℃,GHSV of 2 350 h-1,catalyst inventory of 0.8 kg,and the mean particle diameter is 70μm.Under the optimal conditions,the conversion of propane is 43.46%and the selectivity of propylene is 85.66%,the yield of propylene reaches up to 37.24%.CFD is proved to be capable of applications in the simulation,design,scale-up and optimizations of fluidized-bed reactors for propane dehydrogenation process.