中文摘要：

采用热重分析仪研究了云南玉溪煤和新疆准东煤的加氢热解煤焦二氧化碳气化反应性,考察了成焦压力、停留时间及气氛对煤焦气化反应性的影响,并利用均相模型计算了各煤焦的非等温气化动力学参数。采用实验室固定床反应器,研究了上述两种煤加氢热解煤焦的水蒸气气化特性,考察了成焦气氛对煤焦气化速率和气体产物组成的影响。热重气化实验表明,准东煤焦的气化反应性明显好于玉溪煤焦,前者的反应活化能远小于后者的反应活化能;无论哪种煤,加氢热解煤焦的气化反应性随加氢过程碳转化率的增大呈下降趋势;在相近的碳转化率下,加氢热解煤焦的气化反应性明显好于氮气气氛热解所得煤焦。在水蒸气气化的情况下,准东煤焦的气化反应性同样好于玉溪煤焦。总体上准东加氢热解煤焦的产氢率相比氮气气氛热解所得煤焦有所增加,不过对于这两种煤焦,随着气化温度提高,H2与CO的物质的量之比均逐渐接近于热力学平衡所得的计算值。

英文摘要：

The gasification reactivities of the hydropyrolytic chars obtained from Yunnan Yuxi coal and Xingjiang Zhundong coal were investigated by TGA using carbon dioxide as a gasifying agent.The influences of pyrolysis pressure,residence time and atmosphere on the char reactivities were studied,and the kinetic parameters of non-isothermal char gasification were calculated by the homogeneous model.The gasification characteristics of the hydropyrolytic chars obtained from the above mentioned two coals were further investigated on a laboratory fixed bed reactor using steam as a gasifying agent,focusing on the effects of coke atmosphere on the gasification rate and gas compositions.TGA results showed that the hydropyrolytic chars derived from Zhundong coal had considerably better reactivity with lower activation energy than those from Yuxi coal.For both coals,the gasification reactivities of hydropyrolytic chars decreased as the carbon conversion obtained in the hydropyrolysis increased.The hydropyrolysis was beneficial to promote the reactivity of char compared to the pyrolysis under N2 atmosphere with a close carbon conversion.In the case of steam gasification,the gasification reactivity of Zhundong coal char was better than that of Yuxi coal char.Overall the Zhundong hydropyrolytic char had a higher hydrogen yield than that obtained under N2 atmosphere.However,for both chars,the molar ratio of H2 to CO approached to the calculated data under thermodynamic equilibrium with increasing the gasification temperature.