氧化钙含量对灰渣流体性质影响的研究  

Effect of lime addition on slag fluidity of coal ash

作　　者：孔令学[1,2] 白进[1] 李文[1] 白宗庆[1] 郭振兴[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100049

出　　处：《燃料化学学报》2011年第6期407-412,共6页Journal of Fuel Chemistry and Technology

基　　金：国家重点基础研究发展规划(973计划;2010CB227005-02);国家自然科学青年基金(21006121);山西省青年科技研究基金(2010021008-2);煤燃烧国家重点实验室开放基金(FSKLCC0909)

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。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.

关 键 词：灰渣流体性质 熔融温度 氧化钙 临界黏度温度 FACTsage 

分 类 号：TQ53[化学工程—煤化学工程]