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OALib Journal期刊
ISSN: 2333-9721
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不同气氛下煤连续热解产物的分配规律及产品品质分析
, PP. 1427-1436
Keywords: 煤热解,流化床,气氛影响,焦油产率,半焦活性
Abstract:
？在连续进出料的流化床中研究了热解温度为850℃时，含有o2、h2、co、co2、ch4的反应气氛对热解产物分配规律及产品组成的影响。采用raman、bet等测试方法对不同热解气氛下制得半焦的品质进行了评价，结合热重分析了影响半焦反应活性的因素。结果表明，无o2气氛下，h2与co2存在时降低了焦油产率，而co与ch4促进了焦油的生成。ch4的裂解析碳使半焦产率上升。o2的加入使co2、co含量明显增加，半焦及焦油产率降低。n2中引入o2时，pahs含量降低。ch4促进了烷基萘与苯类的生成，co则抑制酚类裂解生成苯类。co2的气化作用促进了微孔的生成，相应地，半焦的比表面积快速增加，半焦的反应活性也最高。co歧化与ch4热裂解产生的析碳堵塞了部分孔道，降低了比表面积。h2与ch4所产生的氢自由基能渗透到半焦内部，引起半焦结构的缩聚，进而影响氧化反应活性。
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