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Effectiveness for Irregular Shape Methane Steam Reforming Catalyst

Author: ChengShi
Tutor: LiangBin
School: Sichuan University
Course: Industrial Catalysis
Keywords: Alien catalyst Methane steam reforming Efficiency factor Mathematical model Finite Element
CLC: O643.32
Type: Master's thesis
Year: 2004
Downloads: 35
Quote: 0
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Abstract


In recent years, the methane steam reforming catalyst shaped Research made great progress and its main purpose is to improve the efficiency factor of the catalyst, reducing the pressure drop in a fixed bed reactor. But shaped catalyst performance data is still mainly rely on measured, but with universality and regularity of the research is still lacking. Conversion catalyst efficiency factor for the conventional shape, the literature has relatively complete data available, but still very difficult to accurately calculate profiled steam reforming catalyst efficiency factor. Suitable for contour conversion catalyst mass transfer - heat transfer coupling mathematical model, the complexity of the resulting partial differential equations to obtain accurate concentration and temperature distribution, and other algorithms difficult, complex process, and strong skills. Article solved using the finite element method, the solution method is simple, rapid, precise, balancing dead profiled reforming catalyst complex domain particularity little difficult to model solution readily be extended to a variety of complex shape reforming catalyst . In order to test the mathematical model, the magnetic stirring inner loop gradient reactor, 570 ~~ 770 ° C, 3.0MPa experimental conditions, spherical and three-hole ellipsoid seven holes into the intrinsic kinetics of the catalyst and macro dynamics establish the power function of the intrinsic kinetic equation. Application of the model catalyst macroscopic kinetic experiments point calculations, concentration, temperature, and other parameters of the distribution within the catalyst, and further calculated the efficiency factor, calculated value is in good agreement with the experimental values ??prove that the model is reliable . The simulation results show that the the the spherical catalyst efficiency factor of seven holes from .2369 to 0.3550 between the experimental value compared to an average relative error of 8.22%; three-hole spheroidal catalyst efficiency factor from 0.2136 to .3209, the average relative error of 10.71%. Compared to spherical traditional catalyst, has greatly improved the efficiency factor of abnormal. The seven-hole ellipsoid catalyst grain memory at a temperature difference of 10 ~ 16 ℃, three-hole ellipsoid catalyst particles memory at 10 ~ 20 ℃ temperature difference, the temperature difference can not be considered isothermal. Concentration and temperature in the catalyst particles rely on the outer surface of Sichuan University, a master's degree thesis in recent catalyst change, while the flat near the catalyst at the center of change, there is a big dead. Keywords: Alien catalyst; methane steam reforming; efficiency factor; mathematical model; finite element

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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