秸秆灰对煤焦气化反应性的影响

摘要

Potassium and calcium have an important effect on gasification reactivity of coal char. There are rich potassium and calcium in straw ash. The effect of straw ash on the gasification reactivity of Shenmu coal char was studied with thermal analyzer STA409PC,and specific surface area and pore structure of coal char were analyzed by measuring iodine adsorption value of coal char. The gasification reactivity of coal char from co-coking with coal and corn straw was superior to coal char alone,which was associated with the adding proportion of corn straw. The gasification reactivity of coal char from co-coking with coal and de-ashed corn straw was similar to pure coal char. When straw ash equivalent to corn straw ash was added to coal char,the gasification reactivity was superior to that of coal char from co-coking with coal and corn straw The iodine adsorption value determination of coal char showed that the iodine adsorption value of coal char from co-coking with coal and de-ashed corn straw was the maximum,and the iodine adsorption value of pure coal char was the minimum,which showed that corn straw and straw ash had an important influence on specific surface area and pore structure of coal char,basically identical with the gasification reactivity evaluation results.%钾、钙对煤焦气化反应性具有重要影响，秸秆灰中含有丰富的钾、钙。以神木煤为制焦原料，通过STA409PC同步热分析仪研究了秸秆灰对煤焦气化反应性的影响，并通过测定煤焦的碘吸附值对其比表面积及孔隙结构进行了分析。结果表明：煤与玉米秸秆共焦化所得煤焦的气化反应性明显优于单独煤焦，且与玉米秸秆的添加比例有关；采用脱灰玉米秸秆与煤共焦化所得煤焦的气化反应性与单纯煤焦相近；将与玉米秸秆等效的秸秆灰添加到煤焦中，煤焦的气化效果明显优于等效玉米秸秆与煤共焦化所得煤焦。煤焦碘吸附值测定结果表明，脱灰秸秆与煤共焦化所得煤焦的碘吸附值最大，单纯煤焦的碘吸附值最小，说明玉米秸秆及秸秆灰对煤焦的比表面积及孔隙结构具有重要的影响，与煤焦的气化反应性评价结果基本一致。