摘要
针对燃煤电厂超低排放机组,研究了固相产物中的铬和砷两种痕量元素的含量及其赋存和浸出特性。结果表明,超低排放机组飞灰中铬和砷含量均高于底渣。对于飞灰,1#、2#、3#机组铬和砷占比最大的形态分别为可交换态和可氧化态,而4#机组铬和砷占比最大的形态均为残渣态。砷的浸出量低于地下水环境标准(GB 14848—2017)中规定的0.01 mg/L,而2#和3#机组飞灰中铬的浸出量高于排放限值,应予以高度关注。
The content and state and leaching characteristics of the two trace elements,viz.,chromium(Cr)and arsenic(As),in the solid product of ultra-low emission units in the coal-fired power plants are investigated.The results show that the contents of chromium and arsenic in the fly ash are in general higher than those in the bottom slag.In the fly ash samples of units 1#,2#,and 3#,the most abundant chromium and arsenic species appear in the exchangeable state and oxidizable state,respectively,whereas in the ash sample of unit 4#,the residues account for the most chromium and arsenic species.The leaching concentration of arsenic is lower than 0.01 mg/L as specified in the groundwater environmental standard(GB 14848—2017);however,the leaching concentration of chromium in the fly ash of 2#and 3#units is higher than the emission limit,to which close attention should be paid.
作者
崔向峥
魏书洲
张军峰
赵永椿
张军营
郑楚光
CUI Xiang-zheng;WEI Shu-zhou;ZHANG Jun-feng;ZHAO Yong-chun;ZHANG Jun-ying;ZHENG Chu-guang(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan430074,China;Sanhe Power Generation Co.,Ltd.,Sanhe065201,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2020年第12期1506-1512,I0007,共8页
Journal of Fuel Chemistry and Technology
基金
国家重点研发计划项目(2018YFB0605104)
国家自然科学基金(42030807)
湖北省重点研发计划项目(2020BCA076)资助。
关键词
超低排放
铬
砷
含量
形态
浸出特性
ultra-low emission
chromium
arsenic
content
speciation
leaching characteristics
