2020-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/683212摘要：本計畫使用計算流體力學耦合反應動力學以模擬生質物在流體化床中的熱裂解。藉由各種不同虛擬操作參數(包含氣體流速、生質物進料速率、反應爐溫度、床量等操作變因)找尋產製熱裂解化學油品之最佳操作。目前團隊已經熟悉軟體工具Ansys-Fluent，並有相關軟體使用版權。將以Eulerian Multiphase modeling進行研究，考慮系統內各相的差異性將系統分為氣體相、床質固相、生質物固相、焦碳固相等四相。使用standard k-epsilon turbulent 模型分析四相的流態與SIMPLE數值模擬耦合速度場與壓力場。在反應方面，則採用global reaction model: 以先活化(反應k1)、再裂解(反應k2、k3)並考慮二次裂解反應(反應k4)方式進行反應動力學分析，在不同操作條件下模擬分析流體化床的熱裂解行為與產物 tar, char, syngas 分率。 本二年期計畫，第一年建立模擬模型，並推得各模擬參數如何與可量測之物理性質聯結，相關結果並與本實驗室先前所得之實驗結果比較；第二年以虛擬操作尋找系統之最佳化操作參數，以產製最大產率之化學油品。 <br> Abstract: In the current project, Computational Fluid Dynamics (CFD) coupling reaction kinetics is used to study biomass pyrolysis in a fluidized bed reactor. The influences of the operating parameters, including the gas fluidization velocities, the biomass feeding rates, the pyrolysis temperatures and the amount of bed materials, on the production of bio-oils are studied. Four phases will be considered in the CFD Eulerian multiphase simulation. They are gas-mixture phase, solid bed phase, solid biomass phase and solid char phase. The standard k-epsilon turbulent model will be adopted to study the hydrodynamics of these 4 phases and SIMPLE method is used for the velocity-pressure coupling. CFD Eulerian multiphase model will couple with the global reaction model to realize the product distributions as, The model includes the activation reaction k1, the pyrolysis reactions k2 and k3, the secondary decomposition reaction k4. Different operating conditions will be applied to predict the distributions of the biomass fluidized bed pyrolyzed tar (bio-oil), char and syngas. This is a two-year project. In the first year, the results from previous experimental work will be used to validate our simulation models. The simulation parameters will be determined based on physical measurable parameters. In the second year, the optimized operation conditions for such a system will be approached.計算流體力學模擬反應動力學模擬流體化床生質物熱裂解CFD simulationReaction kinetics simulationfluidized bedbiomass pyrolysis