大型DJ塔板弓形区的流场研究及工业应用

Study on flow field in arc zone of large-scale DJ tray and its industrial application

以空气-水为物系,在1600 mm×1400 mm的有机玻璃塔内,对大型DJ塔板弓形区进行气液两相流研究,着重考察了气液相共同作用下受液区流量分配和导流板结构对弓形区流场分布的影响,并从计算流体力学(CFD)模拟角度对实验结果进行理论分析。实验结果表明,溢流强度和空塔动能因子的增大有助于流场均匀;在较低溢流强度时,受液区的流量分配比为1∶0.5时的流场较1∶1时更均匀;贴合塔壁弧度设置的导流板也能使液相流场更均匀。通过CFD模拟进一步验证了实验结果,为CFD在大型塔板气液两相流场研究中的应用提供了基础,结构优化后的大型DJ塔板已经成功应用于中国石化某公司芳烃装置的二甲苯精馏塔中。

The gas-liquid two-phase flow in the arc zone of a large-scale DJ tray was studied with an air-water system in a 1600 mm×1400 mm organic glass tower,focusing on the effects of flow allocation in liquid receiving area and guide plate structure on flow field distribution in the arc zone under the combined action of gas and liquid.Theoretical analysis of experimental results was performed via the computational fluid dynamics(CFD)simulation.The experimental results show that the increase of liquid flow rate per unit weir length(L)and superficial kinetic factor of the empty tower contributes to the uniformity of the flow field.When the L is low,the flow field at a flow ratio of 1∶0.5 in liquid receiving area is more uniform than that at a ratio of 1∶1.The guide plates installed in accordance with the tower wall can also make the liquid phase flow field more uniform.The CFD simulation confirmed the experimental results,providing a foundation for the application of CFD in the gas-liquid two-phase flow field of large-scale tray.The large-scale DJ tray with optimized structure has been successfully applied to the xylene column of an aromatics plant of Sinopec company.