摘要
采用氢化物发生器和原子荧光光谱法联用 (HG AFS)和电感耦合等离子发射光谱法 (ICP AES) ,测定了常压流化床煤气化产物中As、Cd、Co、Cr、Cu、Mn、Mg、Ni、Hg、Pb、V、Se、Sr、Zn 1 4种痕量元素含量 ,分析了空煤比对痕量元素在气化产物中迁移规律的影响。结果表明 :在旋风高温焦中 ,Cd、Ni富集 ,As、Co、Cu、V、Se、Hg耗散 ;空煤比对Mn、Sr、Hg、Se、As影响不大 ;随着空煤比增加 ,Pb、Zn、Cu、Co、Ni的相对富集系数 (REs)略微增加 ,Cd、Mg的REs减少 ;V、Cr在低空煤比条件下有较高的REs。在布袋低温焦中 ,Cd、As、Cu、Cr、Ni、Pb、Zn富集 ,Co、V、Se、Hg耗散 ;随着空煤比增加 ,Pb、Cu、Ni的REs增加 ;Cd、As、Cr、Se的REs减少。底渣中的Mn和Sr相对于高、低温焦而言有轻微的富集。随着空煤比增加 ,Cu、Zn在煤气中含量增加 ,Cr、Co、As、Hg在煤气中含量减小。
By the combined use of a hydrogenate generator and atomic fluorescence spectrum method as well as an inductance-coupled plasma emission spectrum method measurements were taken of the content of 14 trace elements in gasification products of a constant-pressure fluidized bed. These trace elements are: As, Cd, Co, Cr, Cu, Mn, Mg, Ni, Hg, Pb, V, Se, Sr, Zn. An analysis was conducted of the influence of air/coal ratio on the migration mechanism of trace elements in the gasification products. It has been found that in the high-temperature coke from a cyclone, Cd and Ni have been enriched, and As Co, Cu V, Se and Hg dissipated. Air/coal ratio does not have any significant influence on Mn, Sr, Hg, Se and As. With an increase in the air/coal ratio the relative enrichment factor of Pb, Zn, Cu and Ni will slightly increase, while that of Cd and Mg will decrease. Under a low air/coal ratio V and Cr will have a comparatively high relative enrichment factor. In the low-temperature coke from a cloth bag, Cd, As, Cu, Cr Ni Pb and Zn will be enriched while Co, V Se, and Hg dissipated. With an increase in the air/coal ratio the relative enrichment factor of Pb, Cu and Ni will increase, while that of Cd, As Cr and Se decrease. Relative to high and low-temperature coke the Mn and Sr in the bottom slag will be slightly enriched. An increase in the air/coal ratio will lead to a higher content of Cu and Zn in the gas, and a lower content of Cr, Co, As and Hg in the gas.
出处
《热能动力工程》
CAS
CSCD
北大核心
2004年第4期402-407,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家重点基础研究发展规划项目子课题 (G19990 2 2 10 5 3 )
教育部跨世纪优秀人才基金资助项目 (K980 0 2 6)
关键词
痕量元素
迁移规律
空煤比
流化床
气化炉
相对富集系数
trace element, migration law, air/coal ratio, fluidized bed, gasification furnace, relative enrichment factor.
