脱硫石膏附着水影响因素研究

Influencing factors on free moisture of flue gas desulfurization gypsum

影响烟气脱硫石膏附着水含量的主要因素有氯离子含量和颗粒粒度分布,如果氯离子含量较高,颗粒粒度分布宽泛,那么脱硫石膏的附着水含量势必较高;而脱硫石膏中半水亚硫酸钙与附着水含量没有明显的相关关系。探讨了脱硫石膏中附着水、氯离子、可溶性氧化镁和氧化钠含量之间的关系,发现氯离子与可溶性氧化镁和氧化钠含量之间存在很好的相关性,即可溶性氧化镁含量较高的样品,其中的氯离子和可溶性氧化钠含量也较高。氯离子、可溶性氧化镁、可溶性氧化钠含量与电厂真空皮带脱水、水洗环节密切相关。

Content of chloride ion and particle size distributions are the two main decisive factors influencing the free moisture of FGD gypsum. If content of chloride ion is high and its particle size distribution is wide,the content of free moisture of a FGD gypsum sample should be relatively high. However, content of CaSO3·1/2H2O doesn＇t have an obvious relationship with free moisture. In this paper, the relationship between free moisture,chloride ion,content of soluble MgO and soluble Na2O in the FGD gypsum is discussed. It is found that the chloride iron has good correlativity with content of soluble MgO and soluble Na2O,i.e. for sample with relatively higher soluble MgO content,the content of chloride ion and soluble Na2O are also higher. They all have tight relationship with process of vacuum belt dewatering and washing, in power plant.