热溶对红柳林煤低温热解行为的影响

Effect of Thermal Dissolution on Low Temperature Pyrolysis Performance of Hongliulin Coal

以正己烷为溶剂,考察了热溶温度对红柳林煤(HL)热溶行为的影响,并研究了不同热溶温度下残渣的热解特性。结果表明:随着热溶温度从260℃升高至340℃,热溶萃取的小分子化合物(包括焦油和水的液相产物以及气相产物)的产率逐渐从7.10%增加至11.96%。热溶处理对原煤热解行为的影响显著,经过热溶处理后原煤热解析出的挥发分的产率则从28.02%降至10.49%~21.38%。随着热溶温度从260℃升高至340℃,热溶残渣热解过程中析出物质的产率从21.38%降至10.49%,液相产物的产率从12.01%降至3.72%,气相产物的产率稍有降低。煤中的小分子化合物是煤低温热解过程的"活性"物质,它不仅是化合物热解液相产物的组成部分,还可为煤的主体结构热解供氢,促进煤热解向焦油和气体的转化。

The effect of temperature on thermal dissolution of Hongliulin coal （HL） , which was carried out in the solvent of n-hexane , was studied. The results showed that the small molecular compounds extracted from coal （including tar and water） increased from 7. 10% to 11. 96 % as the temperature raised from 260 ℃ to 340 ℃ . Thermal dissolution had a significant influence on the pyrolysis of HL. The volatiles separated from coal pyrolysis reduced from 28. 02 % to 10. 49 % ＂21. 38%. As the dissolved temperature increased from 260 ℃ to 340 ℃ ’ the pyrolysis volatile materials from extracted residue decreasedsignificantly from 21. 38% to 10. 49%. Yield of products in liquid reduced from 12. 01% to 3.72% , and those in gasdecreased slightly. Small molecules in coal were “ active” materials in the process of coal pyrolysis at low temperature, which not only belonged to pyrolysis liquid producttransformation of coal to tar or gas by providing hydrogen to the main structure of coal.