DOI: 10.16597/j.cnki.issn.1002-154x.2024.06.004
二级氢氰化搅拌釜反应器的CFD模拟
作者： 黄蓉，王欣怡，殷文萱，李扬，焦亮，李成胜
单位： 东南大学成贤学院，南京 210088；江苏省林业资源高效加工利用协同创新中心，南京林业大学，南京 210037
摘要： 采用计算流体力学（CFD）技术，以丁二烯直接氢氰化法制备己二腈中的二级氢氰化反应器为研究对象，通过模拟速度分布、湍动能分布，分析功耗来研究桨叶类型、挡板类型对反应釜内流场的影响。结果表明：圆盘涡轮式搅拌桨（DT桨）与四斜叶开启涡轮式搅拌桨（FD桨）的流场相似，产生的湍流程度不高；锚框式搅拌桨（AF桨）釜内流体最紊乱，搅拌效果最好。DT桨功率为2.68 W、FD桨为2.64 W、AF桨为5.08 W。挡板宽度25 mm，带孔挡板孔径为12 mm，带孔挡板增强了近壁面流速，有效改善了搅拌槽内流体的流动状态，提高了搅拌槽功率有效利用率。因此，反应器宜选用AF桨和带孔直挡板。
关键词： 二级氢氰化反应，流体力学，湍流模型，湍动能
CFD Simulation of a Two-stage Hydrocyanide Stirred Kettle Reactor
Authors: HUANG Rong, WANG Xinyi, YIN Wenxuan, LI Yang, JIAO Liang, LI Chengsheng
Affiliation: Chengxian College, Southeast University, Nanjing 210088, China; Jiangsu Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources, Nanjing Forestry University, Nanjing 210037, China
Abstract: Using computational fluid dynamics (CFD) technology, the secondary hydrocyanidation reactor in the direct hydrocyanidation of butadiene for the preparation of adiponitrile was studied. The velocity distribution, turbulent kinetic energy distribution, and power consumption were simulated to investigate the effects of blade type and baffle type on the flow field inside the reactor. By reducing the areas with poor flow in the flow field and making the flow field distribution inside the reactor more uniform, the yield of adiponitrile can be improved. The results showed that the flow field of the disc turbine impeller (DT impeller) was similar to that of the four oblique blade open turbine impeller (FD impeller), and the turbulence generated was not high. The anchor frame impeller (AF impeller) had the most turbulent fluid in the reactor and the best stirring effect. The power of DT propeller was 2.68 W, FD propeller was 2.64 W, and AF propeller was 5.08 W. The width of the baffle was 25 mm, and the aperture of the perforated baffle was 12 mm. The perforated baffle enhanced the near-wall flow velocity, effectively improved the flow state of the fluid in the mixing tank, and increased the effective utilization rate of the mixing tank's power. Thus, the reactor used AF paddles and perforated straight baffles.
Keywords: secondary hydrocyanidation reaction, fluid dynamics, turbulence model, turbulent kinetic energy