Effect of lime addition on slag fluidity of coal ash
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摘要: 考察添加不同比例氧化钙对三种不同煤灰的熔融特性（AFT）和灰渣黏温特性的影响，特别是对不同黏度下临界黏度温度（Tcv）变化进行考察。结果表明，在一定的添加范围内灰熔融温度随着氧化钙添加比例的增加呈先减小后增加的变化趋势，这与通过FACTsage计算得到的全液相温度随氧化钙含量变化的结果相符；灰渣黏度在温度大于临界黏度温度时，随着添加比例的增加不断减小；但研究发现，随着氧化钙添加比例的增加实验中的三种煤灰灰渣黏度的Tcv出现先减小后增加的变化趋势，并且当氧化钙含量约为15%时临界黏度温度Tcv出现最小值；利用FACTsage热力学软件对不同临界黏度温度Tcv处的灰渣熔体中液相组成进行考察发现，最小临界黏度温度下液相组成中的FeO含量出现最大值。Abstract: The ash fusibility temperature (AFT) and slag fluidity of three different coal ash samples through addition of CaO with different amounts were studied. Especially the variation of temperature at critical viscosity was examined at different viscosities. The results show that the fusibility temperatures of coal ashes decrease and then increase with increasing addition amount of CaO, which is consistent with the change of liquids temperature with CaO content calculated by FACTsage. Slag viscosity also decreases with increasing amount of CaO addition above the temperature of critical viscosity (Tcv). The temperature of critical viscosity firstly decreases with increasing addition of CaO, and then reaches a minimum value when the content of CaO is around 15%. FCATsage was employed to calculate the liquid composition at the temperature of critical viscosity. It indicates that high content of FeO of liquid leads to the low temperature of critical viscosity.
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Key words:
- slag fluidity /
- AFT /
- CaO /
- Tcv /
- FACTsage
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