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化工学报  2015 

O2/CO2燃烧对神华煤Ca和Fe交互反应影响

DOI: 10.11949/j.issn.0438-1157.20141162, PP. 753-758

Keywords: 燃料,煤燃烧,交互反应,CCSEM,CO2

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Abstract:

选用高Ca、高Fe含量的神华煤,在沉降炉系统中进行空气以及O2/CO2燃烧实验。利用X射线荧光探针(XRF)、X射线衍射仪(XRD)、先进计算机控制扫描电镜(CCSEM)分别对总灰元素、晶相组成以及主要矿物元素的共生特性进行深入表征。结果表明氧/燃料燃烧促进了Fe、Ca与其他矿物元素的交互反应,总灰中Fe在Fe-rich类矿物分布减少,而在铁铝硅酸盐(Fe-alsil),尤其是在Fe与Ca发生交互反应的Fe+Ca类矿物的分布增加,同时Ca也存在类似的分布规律。对总灰中Fe+Ca类矿物深入分析发现,氧/燃料燃烧条件下总灰中Fe+Ca类矿物结渣倾向更严重(Fe2O3/CaO摩尔比为0.5~3)。

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