O2/CO2煤粉燃烧时含铁矿物质转化行为的实验研究
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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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