Modelação da transferência de calor em reactor de reformação tubular (original) (raw)
With the work developed for the present thesis, a numerical model was prepared to analyze the behavior of a reforming reactor, for methane or methanol as fuels. The developed model is based on the numerical resolution of transport of mass, energy and momentum equations. The steady state is considered and the domain is axissimetric. The resolution of the equations was performed by using a discretization method consisting in finite volumes, with the terms being solved by a hybrid upwind /central differences scheme. The kinetics of reformation was simulated with kinetic models from the literature. The reaction zone, where reforming occurs, was considered to be filled with two types of catalysts: monoliths or fixed-bed of spheres. A study was carried out for these porous media, consisting in the analysis of heat and mass transfer and pressure drop. This analysis was performed using some correlations present in the literature and by estimating those that were not available, with some simplifications. The model validation was made by four experimental test cases. The catalysts characteristics were unknown, so it was used a parameter to represent the internal diffusion in the catalyst particles. This parameter had to be fitted for each test case. The model and experimental results comparison took into account the outlet composition, the conversion of the fuel and temperature profiles. The model proved to be able to calculate consistent results with what was expected. So the model can be used in future investigations in the reforming field, for both methane and methanol.
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