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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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co2对褐煤热解行为的影响
, PP. 257-264
Keywords: co2气氛,热解行为,半焦性质
Abstract:
？利用热天平和快速升温固定床进行了co2气氛下褐煤热解特性的研究,考察了co2对半焦的产率和气体产物分布的影响。通过对半焦的比表面积、孔结构、官能团和元素含量的分析,确定了co2对煤热解过程的影响机制。co2对新生半焦的气化反应破坏了含氢的半焦结构,一方面,促进了羟基、甲基、亚甲基等基团的断裂和苯环的开裂;另一方面,减弱h与其依附本体的结合,增加了氢的流动性,引发了更多的氢自由基生成。这些氢自由基与煤大分子断裂生成的碎片自由基结合生成更多的挥发分,使半焦有较大的比表面积、孔容和开孔率。co2的引入促进了煤的热解和挥发分的生成,增大了h2、co、ch4和c2h6等小分子烃类物质逸出,降低了半焦的产率。
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