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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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co2气氛下生物焦气化反应动力学参数的实验研究：ⅰ.活化能
, PP. 329-335
Keywords: 生物质,co2气化,等转化率法,活化能
Abstract:
？利用热重分析仪在750~1000℃对四种生物质进行了co2等温气化实验。结果表明，各生物质焦的气化反应性随气化温度的升高而增加。用碳转化率为20%时的瞬时气化反应速率r0.2对反应速率r进行无量纲化，发现在实验温度范围内，各焦炭的无量纲气化反应速率-碳转化率曲线均存在两种变化趋势。利用等转化率法求取了四种生物焦在碳转化率达到20%后的气化反应活化能，发现同一种焦炭的气化反应活化能受碳转化率的影响较小，而不同种类焦炭的活化能主要受到焦中无机矿物成分的影响。各焦炭的活化能与焦中碱金属含量与固定碳含量的比值wc/wfc存在近似的线性关系：e=233.9-1005.7×（wc/wfc）。若忽略催化效应的影响，焦炭本征气化反应的活化能趋于某一定值，约为234kj/mol。
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