配入低阶煤对制得气化焦气化特性的影响

从7种煤样中筛选出3种制焦配煤,利用高温热解实验装置在不同热解温度条件下制备3种煤焦,分析了温度对热解产物分布的影响规律,测定了煤焦的比表面积、孔体积及孔径分布特征,并揭示了煤焦孔隙特性及煤种与煤焦的CO2气化反应活性的相互关系。结果表明,随热解温度的升高,3种煤焦收率下降,同等温度条件下,配煤CY/QM制得的煤焦收率最低;在制焦终温低于1 150℃时,煤焦的比表面积及孔体积随制焦温度的提高而增大,气化活性亦随之增加,不同配煤所制得的煤焦反应性大小顺序为:CY/QMCY/QM/JMCY/GSJM;而在制焦温度达到1 150℃之后,煤焦部分孔结构坍塌,其气化活性不再明显增加,3种配煤所制得煤焦的反应性亦相差不大。

Influence of blending low-rank coals on gasification characteristics of gasification coke

Three types of coal blending for coking were screened out from seven types of coal samples.The three types of coal chars were prepared under different pyrolysis temperatures by using high temperature pyrolysis test device.The effect of temperature on the distribution of pyrolysis products was studied.The parameters of the char surface area,pore volume and pore size distribution were investigated to reveal the relationship between coal species and coke reactivity as well as coal coke characteristics.The results show that the yields of the three coal chars decrease with the increase of pyrolysis temperature,and the coal char prepared by blending CY/QM has the lowest yield under the same temperature.The specific surface area and pore volume of coal char increase with the increase of pyrolysis temperature if the temperature is below 1 150 ℃,and the reactivity of coal increases as well.The order of reactivity for coal char samples with different coal blending follows CY/QM>CY/QM/JM>CY/GSJM.However,the partial structure of coal char was collapsed when the pyrolysis temperature reaches 1 150 ℃,and its reactivity was no longer increased.Moreover,the difference in the reactivity of the coal chars prepared by the three types of coal blending is not obvious.