Analysis of the design of a pressurized SOFC hybrid system using a fixed gas turbine design

Park, S.K.; Oh, K.S.; Kim, T.S.

doi:10.1016/j.jpowsour.2007.03.067

Cited by 65 publications

(19 citation statements)

References 7 publications

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“…The programming environment was MATLAB. Simplified models similar to the ones used in references [26][27][28] have been used for the turbo machines as well as for heat exchangers, since the focus was given to compare the exergetic performance of a SOFC alone or incorporated with a GT rather than to investigate part load behavior of a SOFC-GT system.…”

Section: System Modelingmentioning

confidence: 99%

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

et al. 2012

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Abstract:In the present work, an ethanol fed Solid Oxide Fuel Cell-Gas Turbine (SOFC-GT) system has been parametrically analyzed in terms of exergy and compared with a single SOFC system. The solid oxide fuel cell was fed with hydrogen produced from ethanol steam reforming. The hydrogen utilization factor values were kept between 0.7 and 1. The SOFC's Current-Volt performance was considered in the range of 0.1-3 A/cm 2 at 0.9-0.3 V, respectively, and at the intermediate operating temperatures of 550 and 600 °C, respectively. The curves used represent experimental results obtained from the available bibliography. Results indicated that for low current density values the single SOFC system prevails over the SOFC-GT hybrid system in terms of exergy efficiency, while at higher current density values the latter is more efficient. It was found that as the value of the utilization factor increases the SOFC system becomes more efficient than the SOFC-GT system over a wider range of current density values. It was also revealed that at high current density values the increase of SOFC operation temperature leads in both cases to higher system efficiency values.

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Section: System Modelingmentioning

confidence: 99%

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

et al. 2012

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“…Scupita et al [17] studied the effect of fuel composition limited to varying the composition between CH 4 ,CO, CO 2 , N 2 , and H 2 mainly targeting biomass derived gas streams. Some authors have focused on a fixed GT design as commercially available "off the shelf" designs may not be able to perform optimally in the hybrid system not specifically designed for a particular turbine [18,19].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Solid Oxide Fuel Cell Gas Turbine Systems Operating with Various Biofuels

2012

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Solid oxide fuel cell–gas turbine (SOFC‐GT) systems provide a thermodynamically high efficiency alternative for power generation from biofuels. In this study biofuels namely methane, ethanol, methanol, hydrogen, and ammonia are evaluated exergetically with respect to their performance at system level and in system components like heat exchangers, fuel cell, gas turbine, combustor, compressor, and the stack. Further, the fuel cell losses are investigated in detail with respect to their dependence on operating parameters such as fuel utilization, Nernst voltage, etc. as well as fuel specific parameters like heat effects. It is found that the heat effects play a major role in setting up the flows in the system and hence, power levels attained in individual components. The per pass fuel utilization dictates the efficiency of the fuel cell itself, but the system efficiency is not entirely dependent on fuel cell efficiency alone, but depends on the split between the fuel cell and gas turbine powers which in turn depends highly on the nature of the fuel and its chemistry. Counter intuitively it is found that with recycle, the fuel cell efficiency of methane is less than that of hydrogen but the system efficiency of methane is higher.

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“…Different methods are given in the literature to calculate the system pressure losses. The common one is considering constant pressure losses for the components and adding them up to build the system pressure losses [46][47][48][49][50]. However, this method can lead to improper system characteristics evaluation as can be seen from the review of some literature where the same constant pressure losses were considered for SOFC systems of different sizes, ranging from 2 to 250 kW e .…”

Section: Balance Of Plants Componentsmentioning

confidence: 99%

Modelling and Performance Evaluation of Solid Oxide Fuel Cell for Building Integrated Co‐ and Polygeneration

2010

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Models of fuel cell based combined heat and power systems, used in building energy performance simulation codes, are often based on simple black or grey box models. To model a specific device, input data from experiments are often required for calibration. This paper presents an approach for the theoretical derivation of such data. A generic solid oxide fuel cell (SOFC) system model is described that is specifically developed for the evaluation of building integrated co‐ or polygeneration. First, a detailed computational cell model is developed for a planar SOFC and validated with available numerical and experimental data for intermediate and high temperature SOFCs with internal reforming (IT‐DIR and HT‐DIR). Results of sensitivity analyses on fuel utilisation and air excess ratio are given. Second, the cell model is extended to the stack model, considering stack pressure losses and the radiative heat transfer effect from the stack to the air flow. Third, two system designs based on the IT‐DIR and HT‐DIR SOFCs are modelled. Electric and CHP efficiencies are given for the two systems, as well as performance characteristics, to be used in simulations of building integrated co‐ and polygeneration systems.

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Analysis of the design of a pressurized SOFC hybrid system using a fixed gas turbine design

Cited by 65 publications

References 7 publications

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

Exergy Analysis of an Intermediate Temperature Solid Oxide Fuel Cell-Gas Turbine Hybrid System Fed with Ethanol

Thermodynamic Analysis of Solid Oxide Fuel Cell Gas Turbine Systems Operating with Various Biofuels

Modelling and Performance Evaluation of Solid Oxide Fuel Cell for Building Integrated Co‐ and Polygeneration

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