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Investigation on the relationship between the fine particle emission and crystallization characteristics of gypsum during wet flue gas desulfurization process

查看全文 作　　者：Danping [1]Pan;Hao [1]Wu;Linjun [1]Yang 高影响力作者 机构地区：[1]Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 210096, Jangsu Province, China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2017年第29卷第5期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(No.21276049);the National Basic Research Program of China(973 Program)(No.2013CB228505);the Science and Technology Support Program of Jiangsu(No.BE2014856) for their financial support 摘　　要：The relationship between the fine particles emitted after desulfurization and gypsum crystals in the desulfurization slurry was investigated,and the crystallization characteristics varying with the operation parameters and compositions of the desulfurization slurry were discussed.The results showed that the fine particles generated during the desulfurization process were closely related to the crystal characteristics in the desulfurization slurry by comparison of their morphology and elements. With the higher proportion of fine crystals in the desulfurization slurry,the number concentration of fine particles after desulfurization was increased and their particle sizes were smaller,indicating that the optimization of gypsum crystallization was beneficial for the reduction of the fine particle emission. The lower p H value and an optimal temperature of the desulfurization slurry were beneficial to restrain the generation of fine crystals in the desulfurization slurry. In addition,the higher concentrations of the Fe^(3+)ions and the F^- ions in the desulfurization slurry both promoted the generation of fine crystals with corresponding change of the morphology and the effect of the Fe^(3+) ions was more obvious.With the application of the desulfurization synergist additive,it was beneficial for the inhibition of fine crystals while the thinner crystals were generated. 关 键 词：弄湿烟道气体 desulfurization 好粒子 石膏结晶化 排放
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