板翅式甲醇水蒸汽重整制氢反应器的研究
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摘要
本论文目的是研发大能量密度的氢源系统,特别是小规模的分散制氢氢源系统和燃料电池车载氢源系统。
    论文提出了温度均匀分布的甲醇水蒸汽重整反应器的设计思路,并根据此思路,借鉴板翅式换热器的优点,创新研制了全新结构的集成板翅式甲醇重整制氢反应器(简称重整器),集催化燃烧反应、甲醇和水蒸发以及重整反应为一体,使得整个系统的能量效率较高,可实现完全自供热。考察了不同条件对甲醇重整制氢过程和床层温度分布的影响,验证了反应器具有良好的稳定性。
    为了反应器的优化和放大提供理论依据,论文建立了板翅式重整器内多反应耦合过程的三维数学模型,对重整器内部的温度分布和浓度分布进行了数值计算。计算结果表明:该板翅式重整器各腔的温度分布均匀,无热点分布;模型能较准确地预测重整腔内的CO 和H_2的浓度分布。同时,还利用数学模型对反应器的结构参数进行了专门的研究,得到了结构参数影响板翅式重整器性能的初步规律。
    在实验和理论的基础上,论文研究了板翅式重整器在放大过程中涉及的问题和解决技巧,成功设计了5kW 重整器。并以此重整器为核心,联合CO 选择氧化的净化反应器,通过多段换热器对整个系统的能流、物流进行宏观管理与微观调控,成功研制了5kW 的氢源系统样机。
This paper is to develop the fuel processing system with high energy density. Thefocus is on small on-site hydrogen generation system and on-board hydrogengeneration system for the proton exchange membrane fuel cell (PEMFC).
    The methanol steam reforming system, which is adopted in the reformer, has beenthermodynamically analyzed and calculated. A compact plate-fin reactor (PFR)consisting of closely spaced plate-fins, in which endothermic and exothermicreactions take place in alternate chambers, has been studied. In the PFR, which wasbased on a plate-fin heat exchanger, catalytic combustion of the reforming gas, as asimulation of the fuel cell anode off gas (AOG), supplied the necessary heat for thereforming reaction. One reforming chamber, which was for hydrogen production,was integrated with two vaporization chambers and two combustion chambers toconstitute a single unit of PFR. The PFR is very compact, easy to be placed on boardand to scale up. The effect of the ratio of water/methanol on the performance of thePFR has been investigated, and temperature distributions in different chambers werestudied. Besides, the stationary behavior of the plate-fin reactor was also investigated.Heat transfer of the reactor was enhanced by internal plate-fins as well as by externalcatalytic combustion, which offer both high methanol conversion ratio and low COconcentration.
    A model describing the reaction process in the PFR was derived using athree-dimensional numerical model for crossflow arrangement. Temperaturedistributions in different chambers and composition distributions in reformingchamber have been caculated, and the effect of the ratio of water/methanol on theperformance of the PFR has also been calculated. Theoretical predictions of thetemperature distributions in the PFR were in good agreement with experimentalvalues. In addition, the numerical model was able to accurately predict the methanol
    conversion and the reformate composition in reforming chamber. The numericalmodel was also used to describe the effect of configuration parameter on methanolreforming in PFR. The computational results indicate that the combined flowarrangement, which include crossflow, coflow and counterflow, should be adopted inpractical reactor design. The material with higher thermal conductivity should beselected preferentially. In order to minimize the heat transport resistance, small finspace and height should be applied in the reactor design. Based on the PFR, a scale-up reactor was designed and operated continuously for1000 hours, with high methanol conversion ratio and low CO concentration. Acompact integrated fuel processing system consisting of a 5kW PFR and multi-stagepreferential oxidation reactor is designed in this paper. Both internal plate-fins andexternal catalytic combustion were used to enhance heat transfer of the reformer,which offer both high methanol conversion ratio and low CO concentration. So thatthe water–gas shift reactor, which provides primary CO cleanup, is not necessary inthis fuel processing system. It will result in simplification of the fuel processingsystem design and capital cost reduction. The performance of the main componentsin the fuel processing system has been investigated. The axial temperatures of thedifferent chamber in 5kW PFR were uniform, and the temperatures at the inlet andoutlet of the PROX reactors were controlled strictly by plate-fin exchangers so that itcan minimize parasitic hydrogen oxidation. In addition, the results indicated that thisfuel processing system can provide a high concentration of hydrogen and the systemefficiency is always kept above 75%. It is further demonstrated that the fuelprocessing system could be operated autothermally and exhibited good test stability.
引文
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