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摘要: 通过乌兰木伦煤和哈拉沟煤在沉降炉中的燃烧实验,采用57Fe Mssbauer谱仪,对煤中含铁矿物质及其在O2/N2和O2/CO2燃烧条件下生成的灰中含铁成分进行分析和比较,研究了O2/CO2煤粉燃烧时含铁矿物质的转化行为。结果表明,与O2/N2燃烧相比,O2/CO2燃烧对灰中生成的主要含铁矿物相种类没有影响,但显著地改变了灰中含铁矿物相的相对含量;O2/CO2燃烧更有利于内在黄铁矿和菱铁矿生成硅酸盐玻璃体而不是氧化成铁氧化物。灰中含铁矿物相的相对含量变化表明O2/CO2燃烧影响煤的结渣趋势,对于含内在含铁矿物较多的煤,O2/CO2燃烧会增加其结渣的趋势。
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关键词:
- 煤粉 /
- O2/CO2燃烧 /
- 含铁矿物质 /
- 转化行为 /
- 57Fe Mssbauer谱
Abstract: The transformation behaviors of ironbearing minerals during O2/CO2 combustion of pulverized coal usere studied through combustion experiments of by burning wulanmulun coal and halagou coal in a drop tube furnace. 57Fe Mssbauer spectroscopy was employed to characterize and compare in detail the ironbearing components present in the ashes formed in O2/N2 and O2/CO2 combustion as well as those occurring in the parent coals. It was found that, in comparison with O2/N2 combustion, O2/CO2 combustion does not affect the ironbearing phases formed, however, it does affect their relative amounts in the ashes. O2/CO2 combustion favors the included pyrite and siderite to form ironcontaining glass silicates rather than oxidizing to form iron oxides. The changes of the relative amounts of the ironbearing phases in the ashes imply that O2/CO2 combustion may affect the potential of slagging. For the coals highly containing included ironbearing minerals, O2/CO2 combustion may enhance the slagging potential.
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