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Numerical Study on the Flow Field Effect in Methanol-Steam Reforming Performance
|關鍵字:||methanol-steam reforming;甲醇-水蒸汽重組器;annulus tube;baffle plate;shell-and-tube heat exchanger;填充床法;反應器;重組器;熱交換器||出版社:||機械工程學系所||引用:||. 王啟川等人和著，2007年能源科技研究發展白皮書，經濟部能 源局，2007。 . James A. Baker Ⅲ, Energy and nanotechnology: Strategy for the future Conference, Rice University, 2005. . S.Ahmed and M. Krumpelt, Hydrogen from hydrocarbon fuels for fuel cell, Int. J. Hydrogen Energy 26 (2001) 291- 301. . J. C. Brown and E. Gulari, Hydrogen production from methanol decomposition over Pt/Al2O3 and ceria promoted Pt/Al2O3 catalysts, J. Catalysis Communications 5 (2004) 431-436. . J. C. Amphlett, K. A. M. Creber, J. M. Davis, R. F. Mann, B. A. Peppley, and D. M. Stokes, Hydrogen production by steam reforming of methanol for polymer electrolyte fuel cells, Int. J. Hydrogen Energy 19 (1994) 131-137. . A. Karim, J. Bravo, D. Gorm, T. Conant, A. Datye, Comparison of wall-coated and packed-bed reactors for steam reforming of methanol, J. Catalysis Today 110 (2005) 86-91. . R. Y. Chein, L. C. 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Harriot, Unit operations of chemical engineering, fifth ed. New York: McCraw-Hill, 1993, ch. 7. . A. F. Mills, Mass Transfer, Prentice Hall, Upper Saddle River, N. J., 2001.||摘要:||
This study numerically investigates methanol-steam reforming in various types of miniature reactors. All of the reactor designs in this study are based on the heat exchanger theory. First, performances of the reactor designs based on the annulus type heat exchanger are investigated. To increase heat and mass transfer effectiveness, reactant flow is disturbed by placing baffle plates into an inner tube packed with catalyst particles and heated using hot gas flow in the gap between the inner and outer annulus tubes. It was found that the baffle plate creates flow fluctuation inside the catalyst bed which enhances the convective heat transfer between the hot gas and reactant flows and mass transfer between the catalyst particles and reactant flow stream. The reactant flow temperature can be increased closer to the hot gas flow temperature and the enhanced mass transfer between the catalyst particles and reactant flow stream lead to improved methanol conversion in the reformer. The pressure drop across the reactor was found to be not significantly influenced by the baffle plate in a small scale reactor. It was also found that reducing the thermal resistance between the hot gas flow and reactant flow can further improve the methanol conversion.
Secondly, the performance of the reactor design based on shell-and-tube heat exchanger is investigated and compared with the performance of annulus type reactor without introducing the baffle plates. The heat required for the reforming is supplied by the hot gas flowing in the shell side of the reactor while the reactant flow is introduced to the reformers that can be regarded as the inner tubes of the heat exchanger. It was found that the performance of shell-and-tube reactor has better performance than the annulus type reactor because of more effective heat exchanging between the heating gas and reactant flows.
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