摘要
烟气干法脱硫工艺是目前主流的烟气脱硫工艺,在运行过程中会产生大量的脱硫副产物。汞是干法脱硫副产物中主要的重金属成分,且具有较强的环境迁移能力。该研究采集了来自GZ电厂与JL电厂应用相同干法脱硫工艺(CFB-FGD)的燃煤锅炉所产生的脱硫灰渣样品,使用自行搭建的双通道管式炉热解-吸收系统收集样品中的汞,并应用原子荧光光谱仪(AFS)与多通道接收MCICP/MS分别测定了其中汞的含量以及汞同位素特征。结果表明,双通道管式炉热解-吸收系统比单通道节约40%的处理时间,标准参考物质NIST 2692c的回收率为(100.7±4.7)‰。样品中汞的含量范围在31.5~406.5μg/kg之间,均值为168.9μg/kg(n=20)。脱硫灰中δ^(202)Hg数值范围为-1.95‰~1.00‰,Δ^(199)Hg与Δ^(201)Hg则分别为-0.26‰~0.12‰与-0.27‰~0.05‰。Δ^(199)Hg/Δ^(201)Hg的值约为1.032,接近报道中原煤的数值((1.07±0.04),2SE),表明在干法脱硫工艺过程中,汞元素未发生明显的非质量分馏现象。
As one of the most effective methods for controlling sulfur dioxide emission, circulating fluidized bed flue gas desulphurization（CFB-FGD） provide a large amount of residues when being operated. Mercury is one of the major heavy metals in desulfurization residues, having good ability to transfer in the environment. In this study, the samples of desulphurization residues which were collected from the typical coal-fired boilers with CFB-FGD systems of GZ power plant and JL power plant, are analyzed with AFS and MC-ICP/MS to determinate the mercury content and its isotopic signature, respectively.The results show that the double-channel system cut the working time of 40% according to the single-channel method. The recoveries of the standard reference material NIST 2692 c was（100.7±4.7）%. The mercury concentration ranged from 31.5 to406.5 μg/kg with the mean value of 168.9 μg/kg（n=20）. The δ^202Hg, Δ^199Hg, and Δ^201Hg values of residues ranged from-1.95‰ to 1.00‰,-0.26‰ to 0.12‰ and-0.27‰ to 0.05‰, respectively. The value of Δ^199Hg/Δ^201Hg was about 1.032, closed to the value of world coal deposits（1.07 ± 0.04, 2 SE）, indicating no significant mass independent fractionation（MIF） occurred during the transformation of mercury upon coal combustion and processes of desulphurization.
作者
宋庆勇
孙鲁闽
倪少伟
陈永庆
林佩玲
林珊珊
SONG Qingyong1,2, SUN Lumin1,2, NI Shaowei1, CHEN Yongqing1, LIN Peiling1, LIN Shanshan3(1.Key Laboratory of Estuarine Ecological Security and Environmental Health, Xiamen University Tan Kah Kee College, Zhangzhou 363105, China; 2.State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China; 3. Longjing Environment Technology Co. Ltd., Xiamen 361015, Chin)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第1期64-70,共7页
Environmental Science & Technology
基金
国家自然科学基金(41406120)
福建省教育厅科技项目(JA14352)
福建省高校青年人才计划(FJJQJH)
关键词
脱硫灰渣
汞同位素
热解吸收法
desulfurization residues
mercury isotopes
pyrolytic-absorption
