Abstract: Specific surface area and mass transfer rate in spray tower were studied by considering the forces acting on a droplet. Absorption region was divided into accelerating segment and constant speed segment, and a segmentation calculation model for the height of absorption region was developed, which was verified by the data of four industrial desulfurization systems. The effects of operating parameters on the height of absorption region were investigated. The results show that height of absorption region decreases with the decrease of spray density and pH value of absorbent, and increases with the decrease of droplet diameter, superficial gas velocity and inlet SO₂ concentration. The desulfurization efficiency increases with the height of absorption region. When the desulfurization efficiency reaches above 90%, the height of absorption region only has a slightly influence on the efficiency.

Key words: design, mass transfer, model, spray tower, wet flue gas desulfurization, height

摘要： 从液滴受力分析入手，建立了喷淋塔的比表面积和传质速率方程，将吸收区划分为变速段与恒速段，推导了吸收区高度的计算模型，引用工业脱硫塔实际的工艺数据验证了模型的正确性，讨论了操作参数对吸收区高度的影响。结果表明，增加喷淋密度、提高吸收液pH值、减小液滴直径，均可降低吸收区高度；提高操作气速、增大烟气入口SO₂浓度，吸收区高度增加；脱硫率随塔高而增加，但当脱硫率超过90%以后，增加塔高对脱硫率的影响不大。

关键词: 设计, 传质, 模型, 喷淋塔, 湿法脱硫, 高度