Abstract
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 CaSO4Ā·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 CaSO4Ā·2H2O precipitate in CaCl2 solution.
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