CAJ | 학술논문

为了了解现有C5装置所用中空管式反应器内的流场是否为反应所期望的平推流，文中结合理论分析及计算流体力学模拟软件ANSYS CFX 14．5，采用SST湍流模型，发现其入口处存在边界层分离及再附现象。分别对在入口处增加挡板、筛板等轴向阻尼内件和旋转进料的径向阻尼内件进行CFX模拟，并引进一个与速度有关的物理量Jk 来表征返混的程度。结果表明：轴向阻尼内件形式在减少返混程度作用上效果不理想，甚至有加重反混的现象，在所研究的轴向阻尼内件中，迷宫式进料效果最优。结果同时表明采用径向阻尼内件旋转进料器可以较大幅度减小反应器内返混程度。
위료료해현유C5장치소용중공관식반응기내적류장시부위반응소기망적평추류，문중결합이론분석급계산류체역학모의연건ANSYS CFX 14．5，채용SST단류모형，발현기입구처존재변계층분리급재부현상。분별대재입구처증가당판、사판등축향조니내건화선전진료적경향조니내건진행CFX모의，병인진일개여속도유관적물리량Jk 래표정반혼적정도。결과표명：축향조니내건형식재감소반혼정도작용상효과불이상，심지유가중반혼적현상，재소연구적축향조니내건중，미궁식진료효과최우。결과동시표명채용경향조니내건선전진료기가이교대폭도감소반응기내반혼정도。
In order to know whether the flow field in hollow tubular reactor used in the existing C5 device is plug flow which is expected by the reaction,based on the theory analysis and simulation by computational fluid dynamics (CFD)software package ANSYS CFX 14.5,and using SST model,the phenomenon of boundary layer separation and reattachment was found at the entrance of the reactor.Several axial damped internals (baffle,sieve plate)and radial damped internal (feeding screw)were added at the entrance of the reactor for CFX simulation to improve the flow condition,and a physical quantity named Jk which is related to velocity was used to show the extent of the back-mixing.The results show the performance on reducing the extent of back-mixing is not very good by adding axial damped internals,which may even aggravate the problem.Labyrinthic baffle performs best in these axial damped internals.The results also show that the extent of back-mixing can be reduced greatly by adding feeding screw.