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煤中痕量元素在循环流化床锅炉中的迁移行为与富集特性

陈冠益 ,  王钦 ,  颜蓓蓓

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引用本文: 陈冠益, 王钦, 颜蓓蓓. 煤中痕量元素在循环流化床锅炉中的迁移行为与富集特性[J]. 燃料化学学报, 2013, 41(9): 1050-1055. shu
Citation:  CHEN Guan-yi, WANG Qin, YAN Bei-bei. Mobility and enrichment of trace elements in a coal-fired circulating fluidized bed boiler[J]. Journal of Fuel Chemistry and Technology, 2013, 41(9): 1050-1055. shu

煤中痕量元素在循环流化床锅炉中的迁移行为与富集特性

    通讯作者: 颜蓓蓓, 女, 讲师, 从事生物质燃气/煤的燃烧与气化研究, Tel: 022-87401929。
  • 基金项目:

    国家重点基础研究发展规划(973计划, 2012CB214906) (973计划, 2012CB214906)

    国家科技支撑计划(2012BAA09B02)。 (2012BAA09B02)

摘要: 对天津市某电厂循环流化床(CFB)锅炉燃用的原煤及燃烧产物底灰、飞灰、细飞灰(≤50 μm)进行痕量元素含量的测定,分析了Be、Zn、Hg、V、Cr、Mn、Co、Ni、Cu、As、Se、Cd、Pb 13种痕量元素在燃烧过程中的迁移行为,揭示了痕量元素在CFB锅炉中的分配、富集特性。结果表明,CFB锅炉中,较低的炉温对于痕量元素的迁移富集产生了较大的影响。由相对富集系数得知,Be、V、Co、Se在底灰中耗散,在飞灰中富集,Zn、Mn倾向于在底灰中富集,元素Cd、Pb、Ni、Cu挥发性较强,在底灰和飞灰中均是耗散。As受钙氧化物影响,挥发性表现并不明显。Hg在底灰和飞灰中相对富集系数均很低,表明Hg在整个燃烧过程中以气态形式排放;Hg、As、Se、V、Cr、Mn、Co、Ni、Cu、Zn、Pb均有向小颗粒物中富集的趋势。根据相对富集系数以及研究的13种元素在低温CFB锅炉中的迁移行为,将这些元素分为三类:A类(ER<0.1),主要是以气态形式排放元素Hg;B类(0.1<ER≤0.85),较易挥发元素As、Be、Ni、Cu、Se、Cd、Pb、Co、V;C类(ER>0.85),主要残留在固体产物中元素Zn、Mn、Cr。

English

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  • 收稿日期:  2013-01-11
  • 网络出版日期:  2013-04-01
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