催化裂化气体分布器的CFD模拟及优化

CFD modeling and optimization of FCCU gas distributor

部分炼油厂催化裂化流化床气体分布器喷嘴磨损非常严重,环型气体分布器布气不均匀,不利于流化床内催化剂均匀流化。对传统气体分布器喷嘴及环型气体分布器进行CFD气体流场模拟,发现在传统喷嘴入口处气流相互碰撞,导致偏流,致使高压区一侧的内壁磨损严重。新构思的喷嘴,把传统喷嘴入口处改为圆锥形的结构,可以使气体分布更均匀,不易偏流。对新型半环型气体分布器进行了CFD气体流场模拟,结果表明,新型分布器比传统的圆环形气体分布器的气体分布压力更均匀。

The wearing of fluidized-bed gas distributor is very severe in operation in some refineries. The uneven distribution of ring gas distributor is unfavorable for the uniform fluidization of catalysts. CFD Fluid Fields Simulation on conventional gas distributor nozzle inlet and ring gas distributor indicates that air flow collision will cause deflected flow. As the result, the inlet wall at the high pressure area side suffers from severe wearing. To solve this problem, a new kind conical inlet nozzle is designed instead of the conventional type, the use of which makes more uniform flow rather than deflected flow. Furthermore, CFD Fluid Fields Simulation is also applied on the new type half-ring gas distributor. It indicates that the new type half-ring-shaped gas distributor performs better than the traditional ring-shaped one.