Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2485
標題: 甲醇─水蒸汽重組器流場對產氫增益之數值探討
Numerical Study on the Flow Field Effect in Methanol-Steam Reforming Performance
作者: 朱宏健
Chu, Hung-Chien
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: [1]. 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。 [2]. James A. Baker Ⅲ, Energy and nanotechnology: Strategy for the future Conference, Rice University, 2005. [3]. S.Ahmed and M. Krumpelt, Hydrogen from hydrocarbon fuels for fuel cell, Int. J. Hydrogen Energy 26 (2001) 291- 301. [4]. 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. [5]. 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. [6]. 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. [7]. R. Y. Chein, L. C. Chen, Y. C. Chen, J. N. Chung, Heat transfer effects on the methanol-steam reforming with partially filled catalyst layers, Int. J. Hydrogen Energy 34 (2009) 5398-5408. [8]. 陳立昌,熱傳對甲醇-水蒸汽重組影響之數值探討,碩士論文, 中興大學機械工程研究所,2008。 [9]. M. T. Lee, R. Greif, C. P. Grigoropoulos, H. G. Park, F. K. Hsu, Transport in packed-bed and wall-coated steam- methanol reformers, J. Power Sources 166 (2007) 194-201. [10]. R. Tang, P. Erickson, H. C. Yoon, C. H. Liao, Application of heat flux as a control variable in small- scale packed-bed steam reforming, J. Power Sources 195 (2010) 1182-1189. [11]. J. Park, S. Lee, S. Lim, J. Bae, Heat flux analysis of a cylindrical steam reformer by a modified Nusselt number, Int. J. Hydrogen Energy 34 (2009) 1828-1834. [12]. C. Y. Hsueh, H. S. Chu, W. M. Yan, C. H. Chen, M. H. Chang, Numerical study of heat and mass transfer in the plate methanol steam micro-reformer channels, J. Applied Thermal Engineering 30 (2010) 1426-1437. [13]. J. S. Suh, M. T. Lee, R. Greif, C. P. Grigoropoulos, A study of steam methanol reforming in a microreactor, J. Power Sources 173 (2007) 458-466. [14]. J. S. Suh, M. T. Lee, R. Greif, C. P. Grigoropoulos, Transport phenomena in a steam-methanol reforming microreactor with internal heating, Int. J. Hydrogen Energy 34 (2009) 314-322. [15]. W. L. Perry, A. K. Datye, A. K. Prinja, Microwave heating of endothermic catalytic reactions: reforming of methanol, J. AIChE 48 (2002) 820-831. [16]. Y. Matsumura and H. Ishibe, High temperature steam reforming of methanol over Cu/ZnO/ZrO2 catalysts, J. Applied Catalysis B: Environmental 91 (2009) 524-532. [17]. W. Zhou, Y. Tang, M. Pan, X. Wei, H. Chen, J. Xiang, A performance study of methanol steam reforming microreactor with porous copper fiber sintered felt as catalyst support for fuel cells, Int. J. Hydrogen Energy 34 (2009) 9745-9753. [18]. S. R. Segal, K. B. Anderson, K. A. Carrado, C. L. Marshall, Low temperature steam reforming of methanol over layered double hydroxide-derived catalysts, J. Applied Catalysis A: General 231 (2002) 215-226. [19]. P. A. Erickson, C. H. Liao, Heat transfer enhancement of steam reformation by passive flow disturbance inside the catalyst bed, J. Heat transfer 129 (2007) 995-1003. [20]. C. Liao, P. A. Erickson, Characteristic time as a descriptive parameter in steam reformation hydrogen production processes, Int. J. Hydrogen Energy 33 (2008) 1652-1660. [21]. P. A. Erickson, C. H. Liao, Statistical validation and an empirical model of hydrogen production enhancement found by utilizing passive flow disturbance in the steam- reformation process, J. Experiment Thermal and Fluid Science 32 (2007) 467-474. [22]. B. Moghtaderi, I. Shames, L. Djenidi, Microfluidic characteristics of a multi-holed baffle plate micro- reactor, Int. J. Heat and Fluid Flow 27 (2006) 1069-1077. [23]. T. Kim, S. Kwon, MEMS fuel cell system integrated with a methanol reformer for a portable power source, J. Sensors and Actuators A: Physical, xxx (2008) xxx-xxx. [24]. T. Kim, Micro methanol reformer combined with a catalytic combustor for a PEM fuel cell, Int. J. Hydrogen Energy 34 (2009) 6790-6798. [25]. G. Arzamendi, P. M. Dieguez, M. Montes, M. A. Centeno, J. A. Odriozola, L. M. Gandia, Integration of methanol steam reforming and combustion in a microchannel reactor for H2 production : A CFD simulation study, J. Catalysis Today 143 (2009) 25-31. [26]. G. G. Park, S. D. Yim, Y. G. Yoon, C. S. Kim, D. J. Seo, K. Eguchi, Hydrogen production with integrated microchannel fuel processor using methanol for portable fuel cell systems, J. Catalysis Today 110 (2005) 108-113. [27]. P. J. de Wild and M. J. F. M. Verhaak, Catalytic production of hydrogen from methanol, J. Catalysis Today 60 (2000) 3-10. [28]. H. G. Park, J. A. Malen, W. T. Piggott, Ⅲ, J. D. Morse, R. Greif, C. P. Grigoropoulos, M. A. Havstad, R. Upadhye, Methanol steam reformer on a silicon wafer, J. Microelectromechanical Systems 15 (2006) 976-985. [29]. W. L. McCabe, J. C. Smith, P. Harriot, Unit operations of chemical engineering, fifth ed. New York: McCraw-Hill, 1993, ch. 7. [30]. A. F. Mills, Mass Transfer, Prentice Hall, Upper Saddle River, N. J., 2001.
摘要: 
本研究以數值模擬進行在各種不同加熱方式及反應流場型態,對甲醇-水蒸汽重組產氫性能之探討。
其分析結果,在不同的流場中會影響重組器的效能,其熱傳與質傳的增加,使得整體重組器的轉換效率及產氫率提高,當隔板數增加到8p時,轉換率可接近100%,但其在不同的隔板形狀與供熱方式下並無太明顯之差異。
而在不同供熱部分,其內部供熱轉換率僅限於在0p時高於外部供熱之轉換率,當反應器內皆具有隔板時,則外部供熱重組器轉換率會高於內部供熱重組器之轉換率。
熱交換器形式的供熱,則較適合實際上的應用,雖其內部的填充式反應器具有較高的熱阻,但仍具有不低的效能。本次研究主要憑藉著流場變化與供熱方式,進行研究及討論。

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.
URI: http://hdl.handle.net/11455/2485
其他識別: U0005-2008201016254900
Appears in Collections:機械工程學系所

Show full item record
 

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.