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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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水蒸气对褐煤原位气化半焦反应性能及微观结构的影响
, PP. 546-553
Keywords: 褐煤,半焦,水蒸气,原位气化,反应性,微观结构
Abstract:
？为了揭示水蒸气对半焦反应性和微观结构的影响,在自制两段新型反应器上依次进行了褐煤干燥、热解及"热"焦的水蒸气原位气化研究。利用tga、bet和raman光谱仪,对原位气化半焦进行反应性和微观结构解析。结果表明,在反应温度为600℃时,水蒸气对半焦转化率、反应性及微观结构影响很小。温度达到700~900℃,在半焦与水蒸气接触的前2min,虽然半焦转化率变化不大,但其反应性、小环(3~5个芳环)与大环(≥6个环)体系之比及含氧官能团却急剧降低;大于2min,半焦转化率逐渐增大,反应性、小环与大环之比及含氧官能团缓慢降低;而半焦孔结构在2min前后却具有基本一致的变化趋势。半焦与水蒸气接触的前2min,小环与大环之比和含氧官能团急剧降低是导致反应性显著降低的重要因素,大于2min,芳环体系的变化是导致反应性进一步降低的原因。
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