In this study, numerical simulation of the removal process of CO₂ using aqueous solutions of piperazine (PZ) in a bubble column has been done. The main focus of this work is to investigate the applicability of the space-time conservation element and solution element (CESE) method for the numerical solution of the coupling of hydrodynamics, mass transfer and chemical reactions. The reactive absorption process has been investigated by means of experiments and numerical simulation. A two-dimensional computational fluid dynamics (CFD) model in the Eulerian framework has been used to describe the gas-liquid system. To obtain the numerical solution, the CESE method based on a uniform rectangular mesh has been implemented by developing a computer code. Experimental study and CFD simulations have been carried out at different conditions of CO₂ partial pressure (20 and 36 kPa) and solution concentration (0.1, 0.3 and 0.5 M). The simulation results were in reasonable agreement of 5.226 % and 4.575 % with the experimental values for gas holdup and mass transfer flux, respectively. The comparisons prove that the CESE method can be considered as a proper numerical method for the simulation of complex multiphase flows due to its simplicity, accuracy and low computational costs.

在这项研究中，CO ₂去除过程的数值模拟已经完成了在鼓泡塔中使用哌嗪（PZ）水溶液的操作。这项工作的主要重点是研究时空守恒元素和解元素（CESE）方法在流体动力学，传质与化学反应耦合的数值解中的适用性。通过实验和数值模拟研究了反应吸收过程。欧拉框架中的二维计算流体动力学（CFD）模型已用于描述气液系统。为了获得数值解，已经通过开发计算机代码实现了基于均匀矩形网格的CESE方法。在不同的CO ₂条件下进行了实验研究和CFD模拟分压（20和36 kPa）和溶液浓度（0.1、0.3和0.5 M）。模拟结果与气体滞留量和传质通量的实验值分别合理地吻合了5.226％和4.575％。比较结果表明，CESE方法具有简单，准确，计算成本低等优点，因此可以作为模拟复杂多相流的合适数值方法。