In this paper, the main results of an experimental study on SO₂ absorption in a bench-scale θ-ring packed tower using 0.3 mol·L⁻¹ ethylenediamine-phosphoric acid solution was reported, and the effects of main technological parameters on the desulfurization efficiency were investigated. To uncover the mechanism behind the experimental observation, a one-dimensional model incorporated with equations of vapor-liquid equilibrium, heat, and mass transfer for simulating chemical absorption of SO₂ with packed tower was also presented. Furthermore, the parameter distributions associated with heat and mass transfer characteristics along the absorber were also investigated. The results indicated that the relative errors of desulfurization efficiency between predicted and experimental values are less than 18.5% under different conditions and the model had depicted the tendency quite well. In addition, the desulfurization efficiency has positive correlation with increasing liquid-gas ratio, packing height, and ethylenediamine concentration, and declines with the increasing of inlet SO₂ concentration, S(IV) concentration of lean amine, and operating temperature, respectively. Insights are given on the contribution of liquid chemistry reaction and interphase mass transfer on effective utilization of packing layer. Especially, enhancement factor and mass-transfer driving force along the absorber impact directly the SO₂ absorption efficiency. Furthermore, the temperature rise has multiple effects on SO₂ flux distribution, as mainly reflected in gradual accumulation of SO₂(free) and decreasing of SO₂ solubility in amine solution. This model can provide engineering guidance to design a packed tower as well as desulfurization process optimization.

本文报道了使用0.3mol·L ^-1的乙二胺-磷酸溶液在台式规模的θ环填料塔中吸收SO ₂的实验研究的主要结果，以及主要工艺参数对脱硫的影响。效率进行了调查。为了揭示实验观察背后的机理，建立了一个一维模型，该模型结合了气液平衡，热量和传质方程，用于模拟SO _2的化学吸收还介绍了带有挤满塔的建筑。此外，还研究了与沿吸收器的传热和传质特性相关的参数分布。结果表明，在不同条件下，脱硫效率的预测值与实验值之间的相对误差小于18.5％，该模型很好地反映了该趋势。另外，脱硫效率与液气比，堆积高度和乙二胺浓度的增加呈正相关，而随着进口SO ₂的增加而下降。浓度，稀胺的S（IV）浓度和工作温度。给出了关于液相化学反应和相间传质对填料层有效利用的贡献的见解。特别地，沿着吸收器的增强因子和传质驱动力直接影响SO ₂吸收效率。此外，温度升高对SO _2的通量分布具有多种影响，这主要体现在SO ₂（游离）的逐渐积累和胺溶液中SO ₂溶解度的降低。该模型可以为填料塔的设计以及脱硫工艺的优化提供工程指导。