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首页> 外文期刊>Fuel >Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal/Part VI. Further investigation into the effects of volatile-char interactions
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Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal/Part VI. Further investigation into the effects of volatile-char interactions

机译：维多利亚褐煤的热解和气化过程中碱金属和碱土金属物质的挥发和催化作用/第六部分。进一步研究挥发炭相互作用的影响

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摘要

The purpose of this study is to further investigate the effects of volatile-char interactions on the volatilisation and dispersion of alkali and alkaline metallic species and changes in char structure during pyrolysis. Ion-exchanged (H-form, Na-form and Ca-form) Loy Yang brown coal samples were pyrolysed in a novel two-stage fluidised-bed/fixed-bed reactor over a wide temperature range of 500-930 deg C. Our results indicate that soot formation and destruction on char (pore) surface during volatile-char interactions could be catalysed by Na and, to a lesser extent, Ca on char. Volatile-char interactions caused additional volatilisation of Na at temperatures higher than 700 deg C although there are no effects on the volatilisation of Ca. The formation and simultaneous (catalytic) destruction of soot on char surface are closely linked to the volatilisation of Na from the char. Volatile-char interactions have also caused changes in char structure and/or changes in Na/Ca dispersion, as is reflected by the reduction in char reactivity. These results indicate that the volatile-char interactions are not limited on the char surface. It appears that H radicals must have penetrated into the char structure during volatile-char interactions.
机译：这项研究的目的是进一步研究挥发炭相互作用对碱金属和碱金属物质的挥发和分散以及热解过程中炭结构变化的影响。离子交换（H型，Na型和Ca型）的Loy Yang褐煤样品在新型两级流化床/固定床反应器中在500-930摄氏度的宽温度范围内热解。结果表明，在焦炭相互作用的过程中，炭（孔）表面炭黑的形成和破坏可以被碳酸钠催化，而焦炭上的钙催化程度较小。挥发炭相互作用使Na在700℃以上的温度下额外挥发，尽管对Ca的挥发没有影响。炭表面上烟灰的形成和同时（催化）破坏与炭中钠的挥发密切相关。挥发性炭的相互作用也引起了炭结构的变化和/或Na / Ca分散度的变化，如炭反应性的降低所反映。这些结果表明挥发性炭的相互作用不限于炭表面。看来H自由基在挥发-碳相互作用中必须已经渗透到碳结构中。

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