摘要
以我国西南地区典型燃煤电厂为对象,研究砷在煤和飞灰中的分布,从煤粉—静电除尘器(ESP)前飞灰—静电除尘器(ESP)飞灰—静电除尘器(ESP)后飞灰,砷的浓度逐渐上升,在ESP后烟气中浓度达到最大值;随着粒级的减小,砷在不同粒级可吸入颗粒物中的浓度总体上表现出上升趋势;认为飞灰对砷的富集作用主要有4种:硅酸盐熔体对砷的溶解作用;飞灰中的化学成分与砷的化合物反应生成稳定的化合物;飞灰对砷化合物的吸附作用;气相砷化合物在飞灰表面的凝结作用.
The distribution characteristics of arsenic in fly ash from typical coal-fired power plants in the southwest of China is studied, and find that the concentration of arsenic increase in the order of coal particles-fly ash at ESP inlet-ESP fly ash-fly ash at ESP outlet and reach its climax in fly ash at ESP outlet. The concentration of arsenic in inhalable particulates with different size-grade takes on a increasing trend overall with the decrease of the size-grade; concluded that the distribution characteristics of arsenic is a direct reaction result between fly ash and arsenic; there are four probable reaction mechanisms: arsenic is dissolved by silicate melting-mass, reacts with some chemical components in fly ash and produces stable substance, adsorbed by fly ash and condensed on the surface of fly ash.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2004年第1期78-82,共5页
Journal of China Coal Society
基金
国家自然科学基金资助项目(40102013)
国家重点基础研究发展计划资助项目(2002CB211600)
关键词
砷
可吸入颗粒物
分布特征
富集机理
arsenic, inhalable particulates, distribution characteristic, enrichment mechanism
