摘要
对某 3 0 0MW燃煤电厂锅炉进行煤、渣、飞灰取样后 ,测定煤和燃烧产物中砷的含量 ,计算了砷在燃烧产物中的分布 ,研究了电除尘 4个电场飞灰中砷含量与粒径的关系 .结果表明 ,通过除尘装置滞留下来的砷量占总砷量的 5 1.8% .飞灰中砷的含量随着粒度的降低而升高 .使用逐级化学浸提法研究了粒度不同的飞灰中砷的形态分布 .将飞灰中的砷分为水可浸出态、可交换态、碳酸盐 表面氧化物结合态、铁锰氧化物结合态以及残渣态 .不同粒径的飞灰形态分布相似 ,即残渣态 >碳酸盐 表面氧化物结合态 >铁锰氧化物结合态 >
Coal, slag and fly ashes were sampled from a 300 MW utility boiler at the rated load. The arsenic contents of those samples were analysed and the distribution of arsenic in combustion product was investigated. The influence of particle size on the arsenic concentration were also studied. The result shows that Arsenic quantity in fly ash to total combustion products is about 51.8% and arsenic was highly enriched in the smallest ash particle. The mobility of arsenic of fly ash was investigated using sequential extraction procedures. The results for four fly ashes are fairly similar that the content of arsenic bound in different forms of occurrence in the fly ash studied increase in the order residue > carbonate-bound, surface oxide-bound ions > readily exchangeable ions > water-extractable. However, the arsenic in small particles was more active and harmful.
出处
《燃烧科学与技术》
EI
CAS
CSCD
2004年第4期299-302,共4页
Journal of Combustion Science and Technology
基金
国家重点基础研究专项经费资助项目 (2 0 0 2CB2 1 1 60 2 )
关键词
砷
飞灰
粒度
形态
Arsenic
Boilers
Particle size analysis
