Biomass pyrolysis in a micro-fluidized bed reactor: Characterization and kinetics
Biomass pyrolysis in a micro-fluidized bed reactor: Characterization and kinetics
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DOI：
10.1016/j.cej.2011.01.097
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发表时间：
2011-04
影响因子：
15.1
通讯作者：
Jian Yu;Changbin Yao;Xi Zeng;S. Geng;Li Dong;Yin Wang;Shiqiu Gao;Guangwen Xu
中科院分区：
文献类型：
--
作者：
Jian Yu;Changbin Yao;Xi Zeng;S. Geng;Li Dong;Yin Wang;Shiqiu Gao;Guangwen Xu
开发了一种微流化床反应器（MFBR），以实现（1）颗粒反应物的在线脉冲进料和快速加热，（2）通过流化有效抑制界面扩散，（3）通过采用精细固体反应物最小化颗粒内扩散，以及（4）使用例如过程质谱仪在线监测流出产物气体的组成。将该反应器应用于生物质热解实验，结果表明，与热重实验相比，该反应器使生物质热解具有更高的气体产率和更少的残碳，在1173 K时，反应在10 s内完成。释放单个气体组分的时间跨度对于H2来说最长，对于CO2来说最短，并且对于CH 4和CO来说相当。反应动力学进行了研究，相对于形成单独的气体组分和热解气体混合物。反应的活化能和指前因子分别为11.77kJ/mol和1.45s-1。这些值明显低于用TG和固定床反应器测量的值，反映了MFBR能够实现的快速反应性质。随后的比较进一步揭示了影响动力学参数值的因素。
A micro-fluidized bed reactor (MFBR) was developed to enable (1) on-line pulse feeding and rapid heating of particle reactant, (2) effective suppression of the interfacial diffusion via fluidization, (3) minimization of intra-particle diffusion through adoption of fine solid reactants, and (4) on-line monitoring the composition of effluent product gas using, for example, process mass spectrometer. Application of the MFBR to biomass pyrolysis demonstrated that the reactor led the pyrolysis to have higher gas yield and less remaining carbon than the test in TG, and at 1173K the reaction finished in 10s. The time span to release an individual gas component appeared longest for H2, shortest for CO2and equivalent for CH4and CO in between. Reaction kinetics was investigated with respect to the formation of individual gas component and pyrolysis gas mixture. The resulting activation energy and preexponential factor with respect to gas mixture were 11.77kJ/mol and 1.45s−1, respectively. These values were obviously lower than those measured with TG and fixed bed reactors, reflecting the quick reaction nature enabled by the MFBR. A consequent comparison revealed further the factors that affect the values of the kinetic parameters.