高炉熔渣中煤-CO2气化反应性的实验研究

利用STA409PC综合热分析仪以等温热重法对高炉熔渣中煤焦-CO2气化反应性进行了研究，主要考察了渣煤比、气化反应温度和煤种对气化反应的影响，并用反应速率方程法对其动力学参数进行求算.实验结果表明:煤焦的碳转化率、气化反应速率与渣煤比正相关；在煤焦的气化反应中，高炉熔渣具有一定的促进作用；在1673K以下，煤焦的碳转化率、气化反应速率峰值随温度的升高而上升，而当温度高于1673K后，煤焦的碳转化率、气化反应速率峰值随温度的上升呈现下降的趋势；不同煤种，其气化反应性有很大的差异，大同煤的气化反应性要好于阜新煤和焦炭；不同条件下，煤焦的气化反应动力学参数具有很大的差异，焦炭的表观活化能和指前因子随渣煤比的增大而升高，阜新煤的表观活化能和指前因子随渣煤比的增加先降低、后升高.

Experimental Study on Gasification Reaction Characteristics of Coal Char with CO2 in Molten Blast Furnace Slag

The char CO2 gasification reactivity in molten blast furnace slag was studied kinetically by the isothermal thermogravimetry using STA409PC thermal analyzer. The effects of the slag coal ratio， gasification temperature and coal types on the gasification reaction were investigated through the calculation of relevant kinetic parameters according to the reaction rate equation method. The results showed that both the char CO2 conversion rate and the peak value of the reaction rate were positively correlated with the slag coal ratio. The molten blast furnace slag had a certain promotion effect in the char CO2 gasification reaction. When the gasification temperature was lower than 1673K， the char CO2 conversion rate and the peak value of the gasification reaction rate both increased with the increase of the gasification temperature. When the gasification temperature was higher than 1673K， the carbon conversion rate and the peak value of the gasification reaction rate both appeared the tendency of decrease with the increase of the gasification temperature. The gasification reactivity with different types of coal char used differed from each other that the gasification reactivity of Datong coal was better than that of the Fuxin coal and even better than the coke. The dynamic parameters of the gasification reaction existed significant difference in different conditions. The apparent activation energy and pre exponential factor of the coke increased with the increase of the slag coal ratio; the apparent activation energy and pre exponential factor of Fuxin coal increased first and then decreased with the increase of the slag coal ratio.