污染控制技术及原理
侯全辉,骆仲泱,王鹏,徐飞,余春江,岑可法.流化床煤焦混烧飞灰富集污染物的研究[J].环境科学学报,2008,28(9):1848-1853
流化床煤焦混烧飞灰富集污染物的研究
- Enrichment of heavy metals and organic pollutants in fly ash emitted from CFB during the combustion of coal blended with petroleum coke
- 基金项目:教育部科学技术研究重大项目资助(No.0305);教育部科学技术研究重点项目资助(No.03087)
- 侯全辉
- 浙江大学热能工程研究所, 能源清洁利用国家重点实验室, 杭州 310027
- 骆仲泱
- 浙江大学热能工程研究所, 能源清洁利用国家重点实验室, 杭州 310027
- 王鹏
- 浙江大学热能工程研究所, 能源清洁利用国家重点实验室, 杭州 310027
- 徐飞
- 浙江大学热能工程研究所, 能源清洁利用国家重点实验室, 杭州 310027
- 余春江
- 浙江大学热能工程研究所, 能源清洁利用国家重点实验室, 杭州 310027
- 岑可法
- 浙江大学热能工程研究所, 能源清洁利用国家重点实验室, 杭州 310027
- 摘要:针对310t·h-1煤焦混烧循环流化床锅炉,研究了不同工况下飞灰的粒径分布、孔隙结构及重金属、有机物的富集规律.结果表明,煤焦混烧情况下只有不到30%的飞灰粒径大于70μm.随着供氧量的增加、负荷降低、Ca/S比增大,小颗粒飞灰的体积分数增大.不同重金属的转移特性不同,锅炉负荷对重金属分布影响较大.飞灰中3环、4环多环芳烃含量较大,不同因素对各环数多环芳烃分布的影响不同.
- Abstract:The size distribution,pore structure,trace heavy metals and organic pollutants contained in fly ash produced under different combustion conditions were studied using a 310 t·h-1 circulating fluidized bed(CFB)boiler during the combustion of coal blended with petroleum coke.The results demonstrated that the fly ash which was larger than 70 μm is less than 30% during the combustion of coal blended with petroleum coke.With increased O2,Ca/Sratio and decreased boiler load,the number of small particles increased.Different heavy metals had different migration characteristics and boiler load had a large influence on the distribution of heavy metals.The PAHs in the fly ash were dominated by three and four ring structures.Different factors had different influences on different ring PAHs.
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