Analysis of gasification reactivity of different coke optical texture
The optical texture of coke is an internal factor affecting its reactivity.The analysis of gasification reactivi-ty of different optical texture of cokes can better guide coal blending for coke production,that is,by controlling and improving coke reactivity index through reasonable coal blending,the cost of coal blending can be reduced,and the quality of coke can be stabilized and improved.Ten coking coals with different rank,were selected to quantitatively analyze the relative reactivity of each optical texture.The petrographic analyses and coke reactivity experiments were conducted.A prediction equation of coke reactivity was established based on the vitrinite reflectance and the rel-ative reaction rate of optical texture.The results have shown that the reaction rate(absolute value)of different opti-cal texture in different cokes varied significantly,but the relative reaction rates were basically constant,independent of the coke types.The relative reaction rates of isotropic texture,mosaic texture,flow texture,fusinite and fragmen-tal texture were KISO:KM:KF:KFF=2.5 ∶ 1.0 ∶ 0.6 ∶ 2.6.The impact of relative reaction rate of optical texture was higher on coke reactivity index(CRI)than the rank.The prediction equation for coke reactivity based on the vitrinite reflectance and the relative reaction rate of coke optical texture was CRI=-14.73Romax+17.21K+30.78.
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