Some recent advances in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal
Some recent advances in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal
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DOI：
10.1016/j.fuel.2007.01.008
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发表时间：
2007-08-01
期刊：
影响因子：
7.4
通讯作者：
Li, Chun-Zhu
中科院分区：
文献类型：
--
作者：
Li, Chun-Zhu
澳大利亚维多利亚拉特罗布山谷的褐煤具有许多独特的结构特征和性质。褐煤具有非常低的灰分产率，并且含有高度分散的碱金属和碱土金属（AAEM）物质，作为形成其有机物质的一部分的羧酸盐或作为溶解在其水分中的NaCl。由于其独特的结构特征和性质，褐煤的行为与许多其他固体燃料如生物质，烟煤和无烟煤非常不同。例如，其挥发物的高活性性质、其新生炭的脆弱性质以及精细分布的AAEM物质的存在意味着挥发物-炭相互作用（在所有气化器中，特别是在流化床气化器中的常见现象）将影响其热解和气化行为的几乎每个方面。本文综述了近年来维多利亚褐煤热解和气化特性研究的一些进展。在简要介绍AAEM物种对热解产率的影响后，将总结影响AAEM物种挥发的因素。随后将讨论影响褐煤焦的反应性的因素以及通过焦负载催化剂催化重整/净化挥发分和气化产物。脱水/干燥对维多利亚褐煤的热解行为和污染物形成元素的转化的影响将被简要提及。对维多利亚褐煤热解和气化行为的基本认识的进展为进一步开发先进的气化技术，以清洁和有效地利用这种廉价但重要的资源奠定了坚实的基础。(c)2007爱思唯尔有限公司保留所有权利。
The brown coal in the Latrobe Valley, Victoria, Australia, has many unique structural features and properties. The brown coal has a very low ash yield and contains highly dispersed alkali and alkaline earth metallic (AAEM) species, either as carboxylates forming part of its organic matter or as NaCl dissolved in its moisture. Owing to its unique structural features and properties, the brown coal behaves very differently from many other solid fuels such as biomass, bituminous coals and anthracites. For example, the highly reactive nature of its volatiles, the vulnerable nature of its nascent char and the presence of finely distributed AAEM species mean that the volatile-char interactions, a common phenomenon in all gasifiers, especially in the fluidised-bed gasifiers, would influence almost every aspect of its pyrolysis and gasification behaviour. Some recent progress in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal will be reviewed in this paper. After a brief account of the effects of AAEM species on the pyrolysis yields, the factors influencing the volatilisation of AAEM species will be summarised. This will be followed by the discussion of the factors influencing the reactivity of brown coal char and the catalytic reforming/cleaning of volatiles and gasification products by char-supported catalysts. The effects of dewatering/ drying on the pyrolysis behaviour of Victorian brown coal and the conversion of pollutant-forming elements will be mentioned briefly. The progress in the fundamental understanding of the pyrolysis and gasification behaviour of Victorian brown coal has laid solid foundation for the further development of advanced gasification technologies for the clean and efficient utilisation of this cheap but important resource. (c) 2007 Elsevier Ltd. All rights reserved.