Packed distillation columns are key equipment in natural gas pre-treatment process within LNG production process train operated at offshore. In this work, the impact of offshore operating conditions and that of divided wall column shape were explored via developing transient three-dimensional CFD model for a divided wall distillation column filled with structured packing. Inter-phase drag force, porous resistance force, mass transfer, and liquid dispersion were incorporated into volume averaged equations to map the distortion in liquid distribution in response to column oscillatory motion. The results show that introducing a dividing-wall into distillation column affects fluids partition and distribution. Column motions induce complex fluid flows in radial direction that result in oscillatory patterns around the steady-state solution of vertical column. Furthermore, liquid distributions in a divided wall column under influence of column motion differ with respect to column system positions throughout rotational axes, mass transfer also fluctuates according to column oscillations. A position with a dividing wall making an angle of 45˚ with rotational axis gives a scenario in which rolling motion resembles to pitching motion. The thereof position leads to moderate liquid maldistribution in comparison to liquid maldistribution from scenario with dividing wall parallel to rotational axis.

填充式蒸馏塔是海上作业的液化天然气生产工艺流程中天然气预处理过程中的关键设备。在这项工作中，通过为填充规整填料的分隔壁蒸馏塔开发瞬态三维CFD模型，探索了海上作业条件和分隔壁塔形状的影响。将相间阻力，多孔阻力，传质和液体分散度合并到体积平均方程中，以绘制响应于列振荡运动的液体分布畸变图。结果表明，在蒸馏塔中引入分隔壁会影响流体的分配和分布。色谱柱运动会引起径向上复杂的流体流动，从而导致垂直色谱柱的稳态解周围出现振荡模式。此外，在壁运动的影响下，在分隔壁塔中的液体分布在整个旋转轴上随塔系统位置的不同而不同，传质也随塔振动而波动。分隔壁与旋转轴成45°角的位置提供了一种滚动运动类似于俯仰运动的情况。与来自分隔壁平行于旋转轴的情形的液体分布不均相比，其位置导致液体分布不均。分隔壁柱在柱运动的影响下的液体分布在整个旋转轴上随柱系统位置的不同而不同，传质也随柱振动而波动。分隔壁与旋转轴成45°角的位置提供了一种滚动运动类似于俯仰运动的情况。与来自分隔壁平行于旋转轴的情形的液体分布不均相比，其位置导致液体分布不均。分隔壁柱在柱运动的影响下的液相分布在整个旋转轴上随柱系统位置的不同而不同，传质也随柱振动而波动。分隔壁与旋转轴成45°角的位置提供了一种滚动运动类似于俯仰运动的情况。与来自分隔壁平行于旋转轴的情形的液体分布不均相比，其位置导致液体分布不均。