Simulation of a 250 kW diesel fuel processor/PEM fuel cell system
ABSTRACT Polymer-electrolyte membrane (PEM) fuel cell systems offer a potential power source for utility and mobile applications. Practical fuel cell systems use fuel processors for the production of hydrogen-rich gas. Liquid fuels, such as diesel or other related fuels, are attractive options as feeds to a fuel processor. The generation of hydrogen gas for fuel cells, in most cases, becomes the crucial design issue with respect to weight and volume in these applications. Furthermore, these systems will require a gas clean-up system to insure that the fuel quality meets the demands of the cell anode. The endothermic nature of the reformer will have a significant affect on the overall system efficiency. The gas clean-up system may also significantly effect the overall heat balance. To optimize the performance of this integrated system, therefore, waste heat must be used effectively. Previously, we have concentrated on catalytic methanol-steam reforming. A model of a methanol steam reformer has been previously developed and has been used as the basis for a new, higher temperature model for liquid hydrocarbon fuels. Similarly, our fuel cell evaluation program previously led to the development of a steady-state electrochemical fuel cell model (SSEM). The hydrocarbon fuel processor model and the SSEM have now been incorporated in the development of a process simulation of a 250 kW diesel-fueled reformer/fuel cell system using a process simulator. The performance of this system has been investigated for a variety of operating conditions and a preliminary assessment of thermal integration issues has been carried out. This study demonstrates the application of a process simulation model as a design analysis tool for the development of a 250 kW fuel cell system.
SourceAvailable from: Maohong Fan[Show abstract] [Hide abstract]
ABSTRACT: Hydrogen has been widely considered a clean fuel of the future, with the highest mass based energy density of known fuels. Water gas shift (WGS) and steam reforming (SR) are the major reactions used for hydrogen production, and improved catalysts are essential to the future of the WGS and SR processes. Much progress in the different aspects of these fields has been made recently, which includes approaches to preparation and characterization, doping and promotion, as well as evaluation of catalysts, especially nanocatalysts. Significant improvements have been realized in increasing the stability of the catalysts, the overall conversion of raw materials, and the hydrogen production selectivity. This review aims to introduce these hydrogen production processes, to present developments in these areas, and discusses recent improvements that have made noteworthy impacts. CopyrightInternational Journal of Hydrogen Energy 10/2014; 39(30):16983–17000. DOI:10.1016/j.ijhydene.2014.08.041 · 2.93 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: Steam reforming of n-hexadecane, a major component of diesel over Ni-based hydrotalcite-like catalyst was carried out at at atmospheric pressure with space velocity of and feed molar ratio of steam/carbon=3.0. Ni-based hydrotalcite catalyst was prepared by a solid phase crystallization (spc) method and characterized by -physisorption, CO chemisorption, TPR., XRD, and TEM techniques. It was found that spc Ni/MgAl catalyst showed higher catalytic stability and inhibition of carbon formation than Ni/ catalyst under the tested conditions. The results suggest that the modified spc-Ni/MgAl catalyst after optimization may be applied for the SR reaction of diesel.01/2010; 21(5).
[Show abstract] [Hide abstract]
ABSTRACT: Off-grid electricity generation creates a number of environmental, social and economic concerns for remote communities. This represents an opportunity for deployment of SOFC systems in remote areas for distributed power generation. In this paper, a simulation of a 1 kW diesel-fed SOFC system using an auto-thermal reformer is developed and studied using a sensitivity analysis. The influence of key design and operating variables on system performance, where system performance is characterized by the net system efficiency, gross stack efficiency and the final system exhaust temperature is examined. Selected paired variable sensitivities are also examined based on the ranking of individual sensitivities, where two variables at a time are adjusted simultaneously. Of the variables studied, it is observed that variability in the air utilization, fuel utilization and the steam to carbon ratio have the greatest impact on system performance. Overall, an insight is provided into the nature of operating variable interactions as well as those operating variables that require more rigorous process control. The work presented in this study is to be used as a tool by the SOFC Canada NSERC Strategic Network for the design and development of a demonstration small-scale diesel-fed SOFC system.Journal of Power Sources 10/2013; 239:527–537. DOI:10.1016/j.jpowsour.2013.03.107 · 5.21 Impact Factor