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水热处理对我国典型褐煤气化特性的影响

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Keywords: 褐煤,脱水改性,水热,煤气化,煤阶

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Abstract:

选取我国主要褐煤产区不同煤阶的3种典型褐煤,用水热处理对其进行脱水改性并研究改性前后褐煤CO2气化特性的变化。结果表明,经过水热处理后,褐煤中的水分大幅度下降,最高降幅达87.31%,固定碳和热值上升,氧含量下降,煤阶参数(O/C原子比)下降,褐煤煤阶上升。水热处理过程中煤质结构的复杂重整导致煤焦孔径向微孔方向发展,先降低后增加,而比表面积和孔容呈现先上升后下降的趋势。煤质结构深度变化和煤阶的上升使得改性后褐煤的气化特性曲线向高温区移动,碳转化率达到50%时的气化温度上升。动力学计算结果表明,经过水热改性后气化反应活化能上升,反应级数发生变化。较高的水热处理终温和相对较低的原煤煤阶都使得水热脱水改性的效果更为显著。

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