蒙古国煤水蒸气气化制合成气及其热力学特性

摘要

对来自蒙古国不同地区的4种煤样的水蒸气气化性能进行系统研究, 考察了4种煤样水蒸气气化合成气的组成与生成规律;讨论了热力学平衡对4种煤样气化反应的影响.研究发现, 巴嘎诺尔煤 (BN) 、纳赖呼煤 (NL) 和阿拉格陶盖煤 (AT) 的水蒸气气化反应性能明显高于塔本陶勒盖煤 (TT) .BN、NL和AT煤可通过水蒸气气化反应制高H2含量、低CO含量的合成气, 而TT煤水蒸气气化合成气中CO的含量相对较高.造成这种现象的原因是BN、NL和AT煤气化过程中水煤气变化反应 (WGSR) 进行的较为彻底, 消耗了煤与水蒸气直接气化反应所生成的CO, 生成更多的H2, 而TT煤WGSR进行程度较低, 故其合成气中CO含量较高, 因此认为热力学平衡是造成不同种类蒙古国煤水蒸气气化特性存在差异的重要因素.%Steam gasification of coal is one of the efficient ways to produce syngas from coal.Steam gasification performance of four kinds of Mongolia coal was comprehensively investigated in this paper.The composition and the evolution rates of syngas were studied during steam gasification.The influence of thermodynamic equilibrium on the gasification reaction of four coal samples was also discussed.As research shown that the steam gasification performance of Baganuur coal (BN) , Nalaik coal (NL) and Alagtogoo coal (AT) were significantly higher than that of Tawantolgoi coal (TT).The syngas contained high H2 and low CO contents producing by BN, NL and AT, however, TT produced the syngas which contain high CO content, since the watergas shift reaction (WGSR) was carried out completely with high H2 and low CO production rates in steam gasification process of BN, NL and AT.Syngas of high CO content was produced from steam gasification of TT due to its low WGSR.Moreover, the thermodynamic equilibrium was one of the main factors led to the differences of steam gasification characteristics for the four kinds of Mongolia coal.