【作者】 徐宏建； 王书芳； 潘卫国；

【Author】 XU Hong-jian,WANG Shu-fang,PAN Wei-guo (Department of energy and environment engineering,Shanghai University of Electric Power,Shanghai 20090,China)

【机构】 上海电力学院能源与环境工程学院；

【摘要】 在WFGD条件下对二水硫酸钙晶体特性的影响研究表明:pH在3.5～6.5范围内,随着pH的增大,二水硫酸钙结晶诱导时间略呈滞后趋势,但总体变化不大。石膏结晶与溶解是一个动态平衡的过程,结晶过程受分子扩散及晶体生长等的综合作用影响。正交试验表明,各因素对石膏结晶成核诱导时间的影响显著性排序为:温度>钙离子浓度>铝离子浓度>搅拌强度>铁离子浓度>镁离子浓度>pH。其中温度对结晶的影响最显著,钙离子浓度较显著,pH对石膏结晶诱导时间变化不显著。更多还原

【Abstract】 In this paper,the characteristics of gypsum crystallization in wet flue gas desulphurization were researched.And it is important to improve the system operation and the economy of by-product in WFGD.The results can be conclude that in the range of pH 3.5 to 6.5,the induction time of crystallization of calcium sulfate dehydrate is slightly retarded as the pH increase.The crystallization and dissolution of gypsum is a dynamic equilibrium.Combined effected by molecular diffusion and crystal growth etc.,in this study,the stirring speed of 300rpm is appropriate selected.Orthogonal test shows that the significant ordering of various factors on Gypsum crystals induction time of nucieation is:temperature>Ca²⁺>Al³⁺>stirring intensity>Fe³⁺>Mg²⁺>pH.The impact of temperature on the crystallization is the most significant,more significant is concentrations of calcium,and with the impact of pH,induction time of gypsum crystals did not change significantly.更多还原