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標題: 氨氣熱裂解產氫之數值探討
Numerical study of Hydrogen Production by Ammonia Decomposition
作者: 張嘉軒
Chang, Chia-Hsuan
關鍵字: 重組器;NH3 decomposition;氨氣熱裂解反應;填充床法;氨氣轉換率;packed-bed reactor;partially filled reactor;decomposition efficiency;volumetric feed rate
出版社: 機械工程學系所
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The goal of this study aims to explore more understanding regarding the hydrogen production from NH3 decomposition for fuel cell applications. A numerical model based on the commercial computational fluid dynamics package Fluent is developed to solve the governing equations simultaneously. The numerical model is verified using the available experimental data reported in the literature using packed Ni-Pt/Al2O3 particles as the catalyst in a cylindrical reactor.
Based on the good agreement between the numerical and experimental data, the established numerical model is extended to investigate the NH3 decomposition efficiency using partially filled catalyst layer inside the reactor. It is intended to examine the flow effect on the NH3 decomposition. Under the same catalyst loading and NH3 feed rate, it is found that the packed bed reactor has better performance as compared with those with partially filled catalyst layers under the isothermal reaction. The reason may be attributed to that the decomposition is essentially temperature governed and flow plays insignificant role during the isothermal chemical reaction.
Since heat flux is usually applied at the reactor wall in practical operation of reactor, the present study also investigate the NH3 decomposition efficiency with heat flux applied at the reactor wall. Under such thermal condition, it is found that the reactor with partially filled catalyst layer has better performance as compared with the packed bed reactor. This is because of large temperature gradient generated by the fast flow outside the catalyst layer.
For both isothermal and applied heat flux operated reactors, the present study also shows that NH3 volumetric feed rate is an important factor that determining the decomposition efficiency in addition to the type of catalyst.

Keywords: NH3 decomposition, packed-bed reactor, partially filled reactor, decomposition efficiency, and volumetric feed rate.
其他識別: U0005-2108200911142200
Appears in Collections:機械工程學系所

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