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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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含氧/蒸汽气氛中煤高温分解产物分布及反应性
, PP. 660-665
Keywords: 高温热解,水蒸气热解,部分氧化热解,产物分布,半焦气化
Abstract:
？在流化床反应器中考察了含氧/水蒸气气氛中煤在850℃下的热解特性,包括产物分布特性及生成的半焦与焦油的反应性,研究了温度、过量空气比(equivalenceratio:er)和水蒸气/煤比(s/c,质量比)的影响。结果表明,随热解温度、er和s/c质量比的增加,气体产率增加,而半焦和焦油产率减少。o2的加入使co2、co含量明显增加,h2含量降低。o2和水蒸气的加入使半焦的比表面积显著增加,半焦气化活性增强,但半焦在900℃和er为0.22的条件下出现轻微石墨化,降低了其气化活性。同时,反应气氛中含有o2和水蒸气对焦油的性质有显著影响,与单纯的n2气氛相比,o2和水蒸气的存在使热解焦油中单环芳烃、酮类、酚类、脂肪烃都明显减少,这对于焦油的进一步裂解及重整更加有利。
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