| 微型流化床反应动力学分析仪的研制与应用 |
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| 引用本文： | 余剑,朱剑虹,岳君容,孙立鑫,刘新华,许光文. 微型流化床反应动力学分析仪的研制与应用[J]. 化工学报, 2009, 60(10): 2669-2674 |
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| 作者姓名： | 余剑 朱剑虹 岳君容 孙立鑫 刘新华 许光文 |
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| 作者单位： | 中国科学院过程工程研究所多相复杂系统国家重点实验室,北京,100090;湘潭大学化工学院,湖南,湘潭,411105;北京恒久科学仪器厂,北京,101400 |
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| 基金项目： | 国家自然科学基金，中国科学院仪器装备研制项目 |
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| 摘 要： | 本文首次研发了一种用于测定气固反应速度、求算反应动力学参数的微型流化床反应分析仪器（MFBK）。该仪器利用流化床强化反应过程的热量与质量传递过程，通过气体脉冲输送在给定温度下瞬时进样，根据在线监测的气体组分浓度变化，测试反应速度、推导反应动力学参数和分析反应机理。利用该仪器测定氩气气氛中碳酸钙的分解反应表明：其表观活化能与指前因子分别为142.73kJ.mol-1和399777s-1，活化能在文献报道范围之内，且小于热重分析仪测定的184.3kJ.mol-1，并建立了反应模式函数f(α)=(1-α)0.86，对应的拟合线性相关系数达到0.99。测定煤和生物质热解反应过程表明：MFBK测试的反应完成时间在15s左右，且揭示了生成气关键组分具有不同的释放时间和生成量，为深入探讨热解反应机理提供了新的证据。
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| 关 键 词： | 微型流化床 反应动力学 热分解 气固反应 |
| 收稿时间： | 2009-04-17 |
| 修稿时间： | 2009-7-21 |
Development and application of micro kinetic analyzer for fluidized bed gas-solid reactions |
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| YU Jian,ZHU Jianhong,YUE Junrong,SUN Lixin,LIU Xinhua,XU Guangwen. Development and application of micro kinetic analyzer for fluidized bed gas-solid reactions[J]. Journal of Chemical Industry and Engineering(China), 2009, 60(10): 2669-2674 |
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| Authors: | YU Jian ZHU Jianhong YUE Junrong SUN Lixin LIU Xinhua XU Guangwen |
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| Abstract: | A novel micro kinetic analyzer (MFBK) for fluidized bed gas-solid reactions is developed With this MFBK analyzer, the reaction rate and kinetic parameters can be deduced via measuring the time dependent composition changes of its evolved gas.By using a micro fluidized bed reactor, it is expected to enable the on-line feed of particle reactant based on a pulse solid conveying mechanics and the effective suppression of external gas diffusion in the reactor.This MFBK analyzer is evaluated through the decomposition of CaCO3 powder, giving an apparent activation energy of 142.73 kJ.mol-1 and a preexponential factor of 399777 s-1 .This activation energy value is much lower then the TG-measured one of 184.3 kJ.mol-1 and within the literature reported range of 120—280 kJ.mol-1.The measurement also provides a kinetic- model function with a correlation linearity of above 0.99.With this MFBK analyzer, the pyrolysis of coal and biomass at 800℃ is studied.The measured pyrolysis reaction finished in about 15 s, which is very close to the theoretically anticipation.This pyrolysis measurement with the MFBK analyzer can also identify a definite gas release order for typical gas species contained in the pyrolysis formed gas products, which actually can provide a strong evidence for the deep insight in the pyrolysis reaction mechanism. |
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| Keywords: | micro fluidized bed kinetics pyrolysis gas-solid reaction |
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