The solution absorption system has great potential for recovery of water and latent heat from industrial gas. However, few investigations have been conducted on the synergistic removal of SO₂ and the treatment of the associated precipitation when the method is applied for flue gas from coal-fired power plants. To solve this problem, a falling-film reaction platform was established and the CaCl₂ solution was chosen as the liquid desiccant. The effects of solution temperature and concentration, solution pH, O₂ content and catalyst concentration on the efficiency of SO₂ removal were investigated. The solubility of the CaSO₄·2H₂O precipitates in the CaCl₂ solution was measured. The results revealed that the precipitated component was influenced by the O₂ content. The decrease in solution pH was responsible for the decrease in the efficiency of SO₂ removal. The highest SO₂ removal efficiency of 95.6% was obtained during the operation of solution circulation in this experiment. In addition, the solubility test showed that a higher temperature, a lower concentration and the addition of Ca(OH)₂ were conducive to reducing the solubility of the CaSO₄·2H₂O precipitate in CaCl₂ solution.

溶液吸收系统在回收工业气体中的水和潜热方面具有巨大潜力。然而，该方法应用于燃煤电厂烟气中SO ₂协同脱除和伴生沉淀处理的研究较少。为解决这一问题，搭建了降膜反应平台，选用CaCl ₂溶液作为液体干燥剂。研究了溶液温度和浓度、溶液pH、O ₂含量和催化剂浓度对SO ₂去除效率的影响。CaSO ₄ ·2H ₂ O在CaCl _{2 中}的溶解度溶液进行了测量。结果表明，析出组分受O ₂含量的影响。溶液 pH 值的降低是 SO ₂去除效率降低的原因。本实验在溶液循环操作过程中获得了最高的SO ₂去除效率，达到95.6%。此外，溶解度试验表明，较高的温度、较低的浓度和Ca(OH) _{2 的加入}有利于降低CaSO ₄ ·2H ₂ O沉淀物在CaCl ₂溶液中的溶解度。