通过喷雾干燥器系统中Ca(OH)₂溶解度的变化提高二氧化硫的去除率。
Improvement of SO2 removal by the solubility change of Ca(OH)2 in the spray dryer system.
作者信息
Song H C, Park J W
机构信息
Department of Chemical Engineering, Yonsei University, Seodaemoon-gu, Seoul, Korea.
出版信息
Environ Technol. 2001 Sep;22(9):1001-6. doi: 10.1080/09593332208618217.
Experiments were carried out to verify the effect of the solubility change of the Ca(OH)2 sorbent on the removal of SO2 in a lab-scale spray dryer system. First, to identify the solubility effect, HNO3 was added into Ca(OH)2 slurry to increase the solubility of Ca(OH)2 by neutralization. The improvement of SO2 removal by 5-10% occurred under the condition of both 50% relative solubility and constant pH of slurry. But SO2 removal efficiency decreased steeply when the relative solubility approached 100% and the pH of the slurry decreased rapidly. For the practical application of the solubility effect, NH4Cl and NH4OH were selected as additives. Ammonium chloride (NH4Cl) which could improved Ca(OH)2 solubility removed more SO2 by 5-10% than NH4OH which showed no change in solubility. The optimal result was obtained when the slurry was fed at the ratio of 0.25mol NH4Cl/mol Ca(OH)2. The Ca(OH),/NH4Cl sorbent could remove more SO2 and improve Ca(OH)2 utilization than Ca(OH)2 sorbent in the Ca/S stoichiometric range of 1.0-1.4. It was concluded that the increase of sorbent solubility made the improvement in SO2 removal efficiency and Ca(OH)2 utilization.
进行了实验以验证实验室规模喷雾干燥器系统中Ca(OH)₂吸附剂溶解度变化对SO₂脱除的影响。首先，为了确定溶解度的影响，向Ca(OH)₂浆液中加入HNO₃，通过中和作用提高Ca(OH)₂的溶解度。在浆液相对溶解度为50%且pH值恒定的条件下，SO₂脱除率提高了5%-10%。但当相对溶解度接近100%且浆液pH值迅速下降时，SO₂脱除效率急剧下降。为了实际应用溶解度效应，选择NH₄Cl和NH₄OH作为添加剂。能提高Ca(OH)₂溶解度的氯化铵（NH₄Cl）比溶解度无变化的NH₄OH多脱除5%-10%的SO₂。当以0.25mol NH₄Cl/mol Ca(OH)₂的比例进料浆液时，可获得最佳结果。在Ca/S化学计量比为1.0-1.4的范围内，Ca(OH)₂/NH₄Cl吸附剂比Ca(OH)₂吸附剂能脱除更多的SO₂并提高Ca(OH)₂的利用率。得出结论：吸附剂溶解度的增加使得SO₂脱除效率和Ca(OH)₂利用率得到提高。
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