| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 98 === The development of microtechnology has made possible the micro fuel processing system for in-situ hydrogen supply to portable fuel cells. The design of the micro devices of the micro fuel processing system is crucial to the fuel utilization efficient. In this thesis, the plate-fin catalyst coated microreactor for methanol steam reforming is simulated using Computational Fluid Dynamics (CFD) software FLUENT. The simulation results indicate that the heat and mass transfer coefficients are different from that predicted by the correlations for traditional devices. An integrated optimization scheme, involving design of experiment, computational fluid dynamics simulation, response surface model and genetic algorithm, is further adopted for the multiobjective optimization analysis. For the device design parameters, the objective functions considered are the pressure drop and the hydrogen yield. For the operating conditions, the objective functions considered are the hydrogen yield, the hydrogen production rate and the carbon monoxide concentration in the product. The optimal solutions show clear effects of the catalyst coating thickness on the two objective functions, on the other hand, the effects of the number of channels is unclear. For the operating conditions, the optimal solutions show obvious trade-off relation on the hydrogen production and the carbon monoxide concentration, but not so for the other two pairs of the objective functions.
|
|---|
