【摘要】 采用激光多普勒测速仪(LDV)和计算流体力学(CFD)软件,对转盘萃取塔(RDC)内的单相流流场进行了测量和模拟。发现塔内存在沟流和级间的旋涡流动,级间返混严重,为此发明了一种装有级间转动挡板的新型转盘萃取塔(NRDC)。NRDC与传统的RDC的区别在于安装了设计独特的转动挡板。这些转动挡板安装在2个转盘之间,固定在转动轴上,并与固定环处于同一水平面。LDV测量和CFD模拟结果发现,NRDC可有效抑制沟流和级间旋涡流动。传质实验和流体力学表明,NRDC的传质效率比RDC高20%—40%,而液泛速度大致相当。成功地将NRDC用于引进RDC的扩能改造和新塔的设计中。更多还原

【Abstract】 A single phase velocity field was measured and simulated by laser doppler velocimetry(LDV) and computational fluid dynamic(CFD) software of Fluent respectively.Results show that there exist channel flow,swirl flow and severe back mixing between the stages of rotating disc contactor(RDC).A new rotating disc contactor(NRDC) was invented.The NRDC was constructed with additional perforated rotor discs installed inside stator rings and was used for hydrodynamic and mass transfer experiments.The results were compared with those of RDC operation under the same conditions.The LDV measurements and CFD simulations reveal that NRDC can effectively inhibit channel flow and swirl flow.Mass transfer and hydrodynamic experiments show that backing mixing can be suppressed and mass transfer efficiency of NRDC is 20%-40%,higher than that of RDC while the flooding throughput is nearly the same.NRDC was successfully applied in revamping a commercial caprolactam extraction column(RDC) and a new column design.更多还原