煤-富钾生物质共转化催化煤焦气化反应的研究

Study of catalytic gasification of co-pyrolysis char derived from coal and K-riched biomass

在喷动-载流床中制备了不同比例煤与麦秸的共热解焦,在热天平中考察了共热解焦CO2气化反应性,分析了原料比率、热解温度等对共热解焦气化反应特性的影响.结果表明,20%生物质添加比例下,煤-麦秸共热解焦的气化反应性即明显高于煤焦,且共热解焦反应性随生物质比例增加而增大,脱碱金属麦秸与煤共热解焦的反应性则与煤焦相近;试验条件下,热解温度750℃制备的共热解焦中碱金属钾含量最高,并具有最高的气化反应性.动力学分析表明,与煤焦相比,煤-麦秸共热解焦的气化反应活化能显著降低.

The co-pyrolysis chars of coal and straw were prepared in a spout-entrained reactor with different ratios of coal to straw. The CO2 gasification characteristics of co-pyrolysis char was investigated using a thermogravimetric analysis （TGA）. The results show that the gasifi- cation reactivity of copyrolysis chars derived from coal and straw is obviously higher than that of coal char even at 20% blending ratio of straw. The co-pyrolysis char of coal and demineralized straw has the similar reactivity with coal char. The experimental results show that the copyrolysis char prepared at 750 °C has the highest potassium concentration and gasification reactivity. The kinetic analysis reveals that the copyrolysis char shows obviously lower activation energy than coal char.