中文摘要：

尝试利用电子顺磁共振（EPR）法观察不同产地的中低阶煤在不同温度（350℃～600℃），不同停留时间（0min～30min）下煤热解过程中产生的自由基各参数的变化情况，研究中低阶煤热解过程中自由基的演变．结果表明，用EPR法研究煤热解机理快速直接；依据建立的标准曲线法测定煤热解过程中自由基的浓度更为准确；不同产地的中低阶煤热解过程其自由基的变化趋势基本一致，但其绝对值不同，胜利煤初始自由基浓度3．0346×10^18／g，温度为550℃，停留时间10min时达到最大值26．6860×10^18／g，新疆煤初始自由基浓度为15．2830×10^18／g，温度为600℃，停留时间10min时达到最大值57．5370×10^19／g；该方法为进一步探讨煤热解机理和提高轻质焦油产率的工艺提供理论依据．

英文摘要：

ABSTRACT In order to study the rule of free radical changes, free radicals in coal at diffe- rent temperatures （350 ℃-600 ℃）, different holding times（0 min-30 min） were measured by u- sing EPR. The results show that the EPR method is rapid and direct; the determination of free radical concentration in coal based on standard curve method is more accurate; the radical change rule of coals that from different places is consistency, but its absolute value of initial free radicals concentration is difference, the initial free radical concentration of Shengli coal is 3. 034 6 ×10^18/g, and reached the maximum value 26. 686 0×10^18/g at 550 ℃, 10 min, Xinjiang coal initial free radical concentration is 15. 283×10^18/g, and reached the maximum value of 57. 537×10^19/g at 600 ℃, 10 min; this method can provide theoretical basis for the further study of coal pyrolysis mechanism and improvement of the light tar yield.