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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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微型流化床反应分析仪中原位/非原位煤焦气化动力学研究
, PP. 393-401
Keywords: 微型流化床,原位气化,非原位气化,反应动力学,等温反应
Abstract:
？利用新开发的微型流化床反应分析仪(micro-fluidizedbedreactionanalysis,mfbra)考察了义马烟煤半焦的原位以及两种非原位半焦气化行为并测定了其动力学参数,其中,原位半焦气化是指煤热解温度和气氛与半焦气化过程一致,非原位半焦1气化是指煤在ar气氛下热解,热态条件下直接在co2气氛下气化;非原位半焦2气化是指煤在ar气氛下热解,冷却收集后再在co2气氛下气化。研究发现,原位半焦具有最大的比表面积和最小的平均孔径,石墨化程度最弱,且对co2的化学吸附能力最强,表面活性位点最多。在最小化气体扩散的实验条件下,原位半焦气化反应的反应速率明显比非原位半焦气化反应快,且求取的活化能数据较小。实验揭示了原位半焦和非原位半焦结构和反应性的差异,也证明了mfbra对原位等温气化反应的适用性。
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