The Experts below are selected from a list of 78 Experts worldwide ranked by ideXlab platform
Fuchen Wang - One of the best experts on this subject based on the ideXlab platform.
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Simulation of non-catalytic partial oxidation and scale-up of Natural Gas Reformer
Fuel Processing Technology, 2012Co-Authors: Wenyuan Guo, Liang Dong, Caixia Chen, Fuchen WangAbstract:Abstract Computational Fluid Dynamics (CFD) has been applied in the simulation of non-catalytic partial oxidation (NC-POX) of methane and scale up of Natural Gas Reformers. An industrial reference Reformer and a large scale virtual prototype were considered in this study. Benchmark simulations were performed using the presumed PDF model and the Eddy-Dissipation-Concept (EDC) model, respectively. The results show that the PDF model is sufficient and more suitable for an engineering level estimation and trend prediction of the reactions in a NC-POX Reformer. Simulations of a large scale prototype Reformer were performed using the PDF approach. The predicted peak Gas temperature and its relation to the burner parameters were examined numerically. The results suggest that decreasing the temperature of input streams does not necessarily delay the ignition of methane/oxygen mixture. It is verified that a relatively small nozzle can effectively shift the flame downward, and generate a strong recycle flow field in the Reformer.
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multi dimensional modeling of non catalytic partial oxidation of Natural Gas in a high pressure Reformer
International Journal of Hydrogen Energy, 2010Co-Authors: Xinwen Zhou, Caixia Chen, Fuchen WangAbstract:Abstract A three-dimensional simulation model for non-catalytic partial oxidation of Natural Gas in a high pressure Reformer has been developed. In the model, the numerical methods and submodels conventionally used in turbulent reacting flows are used. The GRI-Mech 3.0 mechanism and a tabulated chemistry approach are applied to model the non-catalytic oxidation of Natural Gases under high pressures and temperatures. The reactions are assumed to be fast, hence only the equilibrium states of the multi-step reactions are read in an off-line generated chemistry table. This chemistry table has been created using the equilibrium solver EQUIL from the CHEMKIN II package, and the equilibrium values are functions of the initial mixture compositions and the temperatures at a constant pressure. A presumed PDF model is applied to simulate the interactions between turbulent mixing and the multi-step chemical reactions. Simulations have been performed for a commercial Natural Gas Reformer at various O2/CH4 and O2/H2O ratios and pressures in order to investigate the effect of these parameters on the synGas yields. The results have provided some insights into the strategies of solving the hot-spot problem in industrial Reformers.
Caixia Chen - One of the best experts on this subject based on the ideXlab platform.
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Simulation of non-catalytic partial oxidation and scale-up of Natural Gas Reformer
Fuel Processing Technology, 2012Co-Authors: Wenyuan Guo, Liang Dong, Caixia Chen, Fuchen WangAbstract:Abstract Computational Fluid Dynamics (CFD) has been applied in the simulation of non-catalytic partial oxidation (NC-POX) of methane and scale up of Natural Gas Reformers. An industrial reference Reformer and a large scale virtual prototype were considered in this study. Benchmark simulations were performed using the presumed PDF model and the Eddy-Dissipation-Concept (EDC) model, respectively. The results show that the PDF model is sufficient and more suitable for an engineering level estimation and trend prediction of the reactions in a NC-POX Reformer. Simulations of a large scale prototype Reformer were performed using the PDF approach. The predicted peak Gas temperature and its relation to the burner parameters were examined numerically. The results suggest that decreasing the temperature of input streams does not necessarily delay the ignition of methane/oxygen mixture. It is verified that a relatively small nozzle can effectively shift the flame downward, and generate a strong recycle flow field in the Reformer.
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multi dimensional modeling of non catalytic partial oxidation of Natural Gas in a high pressure Reformer
International Journal of Hydrogen Energy, 2010Co-Authors: Xinwen Zhou, Caixia Chen, Fuchen WangAbstract:Abstract A three-dimensional simulation model for non-catalytic partial oxidation of Natural Gas in a high pressure Reformer has been developed. In the model, the numerical methods and submodels conventionally used in turbulent reacting flows are used. The GRI-Mech 3.0 mechanism and a tabulated chemistry approach are applied to model the non-catalytic oxidation of Natural Gases under high pressures and temperatures. The reactions are assumed to be fast, hence only the equilibrium states of the multi-step reactions are read in an off-line generated chemistry table. This chemistry table has been created using the equilibrium solver EQUIL from the CHEMKIN II package, and the equilibrium values are functions of the initial mixture compositions and the temperatures at a constant pressure. A presumed PDF model is applied to simulate the interactions between turbulent mixing and the multi-step chemical reactions. Simulations have been performed for a commercial Natural Gas Reformer at various O2/CH4 and O2/H2O ratios and pressures in order to investigate the effect of these parameters on the synGas yields. The results have provided some insights into the strategies of solving the hot-spot problem in industrial Reformers.
Silvio Carlos Anibal De Almeida - One of the best experts on this subject based on the ideXlab platform.
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Performance analysis of a 5 kW PEMFC with a Natural Gas Reformer
International Journal of Hydrogen Energy, 2010Co-Authors: José Geraldo De Melo Furtado, George Cassani Gatti, Eduardo Torres Serra, Silvio Carlos Anibal De AlmeidaAbstract:Power systems based on fuel cells have been considered for residential and commercial applications in energy Distributed Generation (DG) markets. In this work we present an experimental analysis of a power generation system formed by a 5 kW proton exchange membrane fuel cell (PEMFC) unit and a Natural Gas Reformer (fuel processor) for hydrogen production. The performance analysis developed simultaneously the energy and economic viewpoints and enabled the determination of the best technical and economic conditions of this energy generation power plant, and the best operating strategies, enabling the optimization of the overall performance of the stationary cogeneration fuel cell unit. It was determined the electrical performance of the cogeneration system in function of the design and operational power plant parameters. Additionally, it was verified the influence of the activation conditions of the fuel cell electrocatalytic system on the system performance. It also appeared that the use of hydrogen produced from the Natural Gas catalytic reforming provided the system operation in excellent electrothermal stability conditions resulting in increase of the energy conversion efficiency and of the economicity of the cogeneration power plant.
P. V. Aravind - One of the best experts on this subject based on the ideXlab platform.
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Fuel cell electric vehicle as a power plant and SOFC as a Natural Gas Reformer: An exergy analysis of different system designs
Applied Energy, 2016Co-Authors: A Fernandes, Leendert A. Verhoef, A.j.m. Van Wijk, T. Woudstra, Linda Verhoef, Ad Van Wijk, P. V. AravindAbstract:Delft University of Technology, under its "Green Village" programme, has an initiative to build a power plant (car parking lot) based on the fuel cells used in vehicles for motive power. It is a trigeneration system capable of producing electricity, heat, and hydrogen. It comprises three main zones: a hydrogen production zone, a parking zone, and a pump station zone. This study focuses mainly on the hydrogen production zone which assesses four different system designs in two different operation modes of the facility: Car as Power Plant (CaPP) mode, corresponding to the open period of the facility which uses fuel cell electric vehicles (FCEVs) as energy and water producers while parked; and Pump mode, corresponding to the closed period which compresses the hydrogen and pumps to the vehicle's fuel tank. These system designs differ by the reforming technology: the existing catalytic Reformer (CR) and a solid oxide fuel cell operating as Reformer (SOFCR); and the option of integrating a carbon capture and storage (CCS).Results reveal that the SOFCR unit significantly reduces the exergy destruction resulting in an improvement of efficiency over 20% in SOFCR-based system designs compared to CR-based system designs in both operation modes. It also mitigates the reduction in system efficiency by integration of a CCS unit, achieving a value of 2% whereas, in CR-based systems, is 7-8%. The SOFCR-based system running in Pump mode achieves a trigeneration efficiency of 60%.
Wenyuan Guo - One of the best experts on this subject based on the ideXlab platform.
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Simulation of non-catalytic partial oxidation and scale-up of Natural Gas Reformer
Fuel Processing Technology, 2012Co-Authors: Wenyuan Guo, Liang Dong, Caixia Chen, Fuchen WangAbstract:Abstract Computational Fluid Dynamics (CFD) has been applied in the simulation of non-catalytic partial oxidation (NC-POX) of methane and scale up of Natural Gas Reformers. An industrial reference Reformer and a large scale virtual prototype were considered in this study. Benchmark simulations were performed using the presumed PDF model and the Eddy-Dissipation-Concept (EDC) model, respectively. The results show that the PDF model is sufficient and more suitable for an engineering level estimation and trend prediction of the reactions in a NC-POX Reformer. Simulations of a large scale prototype Reformer were performed using the PDF approach. The predicted peak Gas temperature and its relation to the burner parameters were examined numerically. The results suggest that decreasing the temperature of input streams does not necessarily delay the ignition of methane/oxygen mixture. It is verified that a relatively small nozzle can effectively shift the flame downward, and generate a strong recycle flow field in the Reformer.
