Comparison of compact reformer configurations for on-board fuel processing

被引:24
|
作者
Karakaya, Mustafa [1 ]
Avci, Ahmet K. [1 ]
机构
[1] Bogazici Univ, Dept Chem Engn, TR-34342 Istanbul, Turkey
关键词
Microchannel reactor; Cascade reactor; Methane combustion; Naphtha steam reforming; Auxiliary power unit; Computational fluid dynamics; WATER-GAS SHIFT; CATALYTIC PLATE REACTOR; MICROCHANNEL REACTOR; HYDROGEN-PRODUCTION; HEAT-TRANSFER; METHANE; CELL; KINETICS; DESIGN; COMBUSTION;
D O I
10.1016/j.ijhydene.2010.01.010
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two compact reformer configurations in the context of production of hydrogen in a fuel processing system for use in a Proton Exchange Membrane Fuel Cell (PEMFC) based auxiliary power unit in the 2-3 kW range are compared using computer-based modeling techniques. Hydrogen is produced via catalytic steam reforming of n-heptane, the surrogate for petroleum naphtha. Heat required for this endothermic reaction is supplied via catalytic combustion of methane, the model compound for natural gas. The combination of steam reforming and catalytic combustion is modeled for a microchannel reactor configuration in which reactions and heat transfer take place in parallel, micro-sized flow paths with wall-coated catalysts and for a cascade reactor configuration in which reactions occur in a series of adiabatic packed-beds, heat exchange in interconnecting microchannel heat exchangers being used to maintain the desired temperature. Size and efficiency of the fuel processor consisting of the reformer, hydrogen clean-up units and heat exchange peripherals are estimated for either case of using a microchannel and a cascade configuration in the reforming step. The respective sizes of fuel processors with microchannel and cascade configurations are 1.53 x 10(-3) and 1.71 x 10(-3) m(3). The overall efficiency of the fuel processor, defined as the ratio of the lower heating value of the hydrogen produced to the lower heating value of the fuel consumed, is 68.2% with the microchannel reactor and 73.5% with the cascade reactor mainly due to 30% lower consumption of n-heptane in the latter. The cascade system also offers advanced temperature control over the reactions and ease of catalyst replacement. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:2305 / 2316
页数:12
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