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电厂中广泛应用的湿法脱硫系统在脱硫的同时会捕集烟气中的部分痕量元素,并将其转移到石膏浆液中,这对脱硫石膏的综合利用带来潜在的影响。该文以典型的湿法脱硫系统为研究对象,通过现场取样测量的方法,分别对石膏浆液脱水系统及废水处理系统中As、Be、Co、Cr、Hg、Mn、Ni、Pb、Sb和Se共10种痕量元素的分布进行了考察,检测了湿法脱硫系统捕获的痕量元素在脱硫石膏等产物中的分布情况,并探讨了脱硫石膏对浆液中痕量元素的富集机理。结果表明:石膏浆液经过脱水后,As、Be、Co、Cr、Hg、Ni、Pb、Sb和Se主要进入石膏中,Mn则主要进入废水中;废水经过处理后,Se主要存在于处理后的中水中,其他元素则都主要进入污泥中。这些痕量元素在石膏和污泥中的赋存形态稳定性不高,因而需要对石膏和污泥进行稳定化处理。
The wet FGD system widely used in power plants, while desulfurization, will capture some of the trace elements in the flue gas and transfer it to the gypsum slurry, which has a potential impact on the comprehensive utilization of FGD gypsum. In this paper, a typical wet desulfurization system was taken as the research object. The samples of As, Be, Co, Cr, Hg, Mn, Ni, Pb, Sb and Se in gypsum slurry dewatering system and wastewater treatment system A total of 10 trace elements were investigated. The distribution of trace elements trapped in the desulfurization gypsum was detected. The enrichment mechanism of trace elements in the slurry by desulfurized gypsum was also discussed. The results show that As, Be, Co, Cr, Hg, Ni, Pb, Sb and Se mainly enter the gypsum after the gypsum slurry is dehydrated, while Mn mainly enters the waste water. After the wastewater is treated, Se mainly exists in the treated In the water, other elements are mainly into the sludge. These trace elements in the gypsum and sludge in the form of stability is not high, so the need for gypsum and sludge stabilization.