蒙古国典型煤种水蒸气气化性能及其动力学特性

Steam gasification performance and kinetic characteristic of Mongolia typical coals

利用固定床装置对来自蒙古国的巴嘎诺尔煤(BN)、纳赖呼煤(NL)、阿拉格陶盖煤(AT)和塔本陶勒盖煤(TT)进行程序升温水蒸气气化实验,考察了4种煤样气化合成气主要组分H_2,CO和CO_2的生成规律,着重研究了煤样气化反应动力学和合成气各组分生成动力学特性,并对2种动力学特性进行分析。研究发现,BN,NL和AT3种煤样气化合成气中H_2和CO_2主要在较低温区(900—1 050 K)生成,CO则在较高温区(>1 000 K)生成,而TT煤气化反应H_2,CO和CO_2均需要在较高温区(>1 000 K)生成。AT和TT煤水蒸气气化反应动力学所选取的模型与其气化合成气各组分生成动力学所选取的模型一致,分别为均相模型和缩核模型。BN和NL煤气化生成H_2,CO_2的生成动力学适宜采用均相模型,而CO的生成动力学适宜采用缩核模型,但这2种煤样的水蒸气气化反应动力学均可采用均相模型。

The temperature programmed steam gasification of four kinds of Mongolian coals （ BN, was tested on a fixed bed reactor. The evolution rates of H2, CO and CO2 were investigated NL, AT and TT） . Meanwhile, the kinetic characteristic of reaction or gas generation was studied emphatically. The results show that H2 and CO2 of BN, NL and AT are produced mainly at 900-1 050 K and CO above 1 000 K during steam gasification process. However, H2, CO and CO2 of TT are produced by steam gasification above 1 000 K. The homogeneous model and the nucleation model are applied to describe the kinetics of steam gasification of AT and TT and the kinetics of gasification synthesis gas formation. The kinetic of H2 and CO2 from BN or NL follows the homogeneous model, CO follows the shrinking model. The reaction kinetics of BN or NL can be used in the homogeneous model.