In order to explore the high-temperature pyrolysis behavior and mechanism, two different rank coals (Shenhua bituminous coal and Baiyinhua lignite coal) were pyrolyzed in fixed-bed and drop tube furnace (DTF) reactors. Pyrolysis gas production was online quantified by a drainage method while the gas composition was detected by the gas chromatography. The physical and chemical characteristics of pyrolysis char were observed by N₂ absorption and FTIR. Results show that pyrolysis gas release rate and total production increase with the higher temperature. The gas production of SH coal (618∼749 ml/g) is always higher than that of BYH coal (418∼510 ml/g) due to its higher volatile content. The main high-temperature pyrolysis gas products are H₂ (∼50% vol), CO, CH₄ and CO₂. Carbon-reduction reaction at high temperatures can further form H₂ and CO while the rupture of aromatic heterocyclic ring can generate CH₄. High-temperature pyrolysis can greatly remove the coal moisture, develop their pore structures, crack the chemical functional groups (O-H, -CH₃, C=O, C-O, etc.) and upgrade the coal rank. Different coal structures and pyrolysis heating rates result in various gas evolution and char formation behaviors. Higher heating rate can help to quickly generate large amounts of free radicals and change the pyrolysis behaviors.

为了探索高温热解行为和机理，在固定床和落管炉（DTF）反应器中对两种不同等级的煤（神华烟煤和白银华褐煤）进行了热解。热解气产量通过排放法在线定量，而气体组成则通过气相色谱法检测。通过N ₂吸收和FTIR观察热解炭的理化特性。结果表明，高温下热解气体的释放速率和总产量增加。SH煤的产气量（618〜749 ml / g）始终高于BYH煤的产气量（418〜510 ml / g），因为其挥发物含量较高。高温热解气的主要产物是H ₂（〜50％vol），CO，CH ₄和CO ₂。高温下的碳还原反应可进一步形成H ₂和CO，而芳香族杂环的断裂可生成CH ₄。高温热解可以极大地去除煤中的水分，形成煤的孔结构，裂化化学官能团（OH，-CH ₃，C = O，CO等）并提高煤的等级。不同的煤结构和热解加热速率导致各种气体逸出和焦炭形成行为。较高的加热速率可以帮助快速生成大量自由基并改变热解行为。