Gasification of a South Australian low-rank coal with carbon dioxide and steam: kinetics and reactivity studies
Gasification of a South Australian low-rank coal with carbon dioxide and steam: kinetics and reactivity studies
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DOI：
10.1016/s0016-2361(98)00014-3
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发表时间：
1998-09
期刊：
影响因子：
7.4
通讯作者：
D. Ye;J. Agnew;Dongke Zhang
中科院分区：
文献类型：
--
作者：
D. Ye;J. Agnew;Dongke Zhang
报道了在大气压和714 - 892°C温度下，在单颗粒反应器中对高活性南澳大利亚低阶煤Bowmans煤与水蒸气和二氧化碳进行的实验气化研究。在给定温度下的气化速率被发现是独立的颗粒尺寸，这表明气化速率遵循均匀模型。观察到的气化速率常数如下。对于CO2气化：【配方：对于H2O气化：[公式：见正文]已发现，由于其固有的高无机物含量，鲍曼斯煤的反应性远高于文献中报道的其它煤。酸洗Bowmans煤具有与其他低无机含量的低阶煤相似的反应性。在相同阴离子条件下，气化反应活性为Na > K > Ca > Ni。不同阳离子的组合效果被发现是小于单个阳离子的总和。在离子交换之前对酸洗煤进行热处理，由于羧基官能团的损失，导致反应性大大降低。反应性可以通过去除或添加活性阳离子来改变。气化反应性和总Na + Ca阳离子含量之间存在合理的良好相关性。
Experimental gasification studies are reported for a highly reactive South Australian low-rank coal, Bowmans coal, with steam and with carbon dioxide in a single-particle reactor operating at atmospheric pressure and at temperatures between 714 and 892°C. Gasification rate at a given temperature is found to be independent of particle size, suggesting that the gasification rate follows the homogeneous model. The observed gasification rate constants are as follows. For CO2gasification: [Formula: see text] For H2O gasification: [Formula: see text] It is found that the reactivity of Bowmans coal is far higher than for other coals reported in the literature, because of to its high inherent content of inorganic matter. Acid-washed Bowmans coal has similar reactivity to other low-inorganic-content low-rank coals. Gasification reactivity follows the other Na > K > Ca > Ni with the same anions. The combined effect of different cations is found to be less than for the sum of the individual cations. Heat treatment of acid-washed coal prior to ion exchange results in greatly reduced reactivity due to loss of carboxylic functional groups. Reactivity can be varied by removing or adding active cations. A reasonably good correlation is found to exist between gasification reactivity and total Na + Ca cation content.