Hybrid Fuel Cell Gas Turbine System Design and Optimization

McLarty, Dustin; Brouwer, Jack; Samuelsen, Scott

doi:10.1115/1.4024569

Cited by 33 publications

(17 citation statements)

References 23 publications

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“…Others have reported that hybrid performance is very sensitive to decreasing U f . McLarty et al [32] reported a 15% decrease in system efficiency when dropping from 80% to 60% U f despite large increases in T IT . However, they conducted their design analysis using a series of parametric tests in which the operating conditions were varied one at a time rather than designing an optimum system for each.…”

Section: Discussionmentioning

confidence: 99%

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Fuel utilization effects on system efficiency in solid oxide fuel cell gas turbine hybrid systems

et al. 2018

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A computational analysis was conducted to optimize the design of a solid oxide fuel cell-gas turbine hybrid power generator, focusing on the impact that fuel utilization within the fuel cell has on system efficiency and installed costs. This is the first ever design-study considering the effect of fuel utilization on performance, as well as on the optimum power split. This hybrid system attained high electric generation efficiencies (>70%) over a wide range of operating conditions (60% < fuel utilization < 90%) while the fuel cell stack size decreased in proportion to decreasing the fuel utilization. A one-dimensional fuel cell model was used to simulate the fuel cell while GateCycle® was used to simulate the performance of the associated recuperated turbine and various subsystems necessary for thermal management. For each test case, the size of the solid oxide fuel cell, gas turbine, and recuperator, as well as the fuel and air flow rates, hot-air bypass set point, and heat exchange effectiveness in the solid oxide fuel cell manifold were varied to obtain 550 MWe output. In addition, anode recycle, turbomachinery efficiency, and various thermal management options were tested. The maximum system efficiency (75.6%) was attained for the single-pass solid oxide fuel cell with highly efficient turbomachinery when the solid oxide fuel cell used 80% of the incoming fuel. Efficiency was essentially flat from 75% fuel utilization through 85% fuel utilization. Employing anode recycle starting at 65% resulted in roughly 1 percentage point efficiency decrease for each percent increase in fuel utilization. For minimized solid oxide fuel cell degradation, a near 50:50 power split case was studied resulting in 68.6% efficiency and the solid oxide fuel cell using 55% of the incoming fuel. Because of shifting half of the power generation to the gas turbine, the size of the fuel cell stack was reduced by 25% as compared to that at maximum efficiency (80% fuel utilization).

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Section: Discussionmentioning

confidence: 99%

“…McLarty et al [32] reported an initial design system efficiency of 66% for coal syngas. This can be consistent with the results presented here of 75.6%, because the final optimized design performance would include the incremental influences of individual parameters such as U f , P r , T FC , η t , η c .…”

Section: Discussionmentioning

confidence: 99%

Fuel utilization effects on system efficiency in solid oxide fuel cell gas turbine hybrid systems

et al. 2018

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“…Due to elevated operating temperatures, SOFCs are fuel flexible and can be combined with conventional gas turbine power plants (hybrid systems). Previous analysis show that hybridization of existing fuel cell and gas turbine technologies canyieldultrahigh electrical efficiencies, in the range of65-75% [7][8][9]. These SOFC features are suited for distributed generation application, which can lead to widespread utilization of glycerol for electricity generation purposes.…”

Section: Introductionmentioning

confidence: 99%

Aproveitamento Energético Eficiente Do Glicerol – Modelamento No Estado Estacionário De Sistema Híbrido De Células a Combustível Do Tipo Óxido Sólido E Turbina a Gás

Silva¹

2019

ABM Proceedings

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Hybrid solid oxide fuel cell/gas turbine systems (SOFC-GT) are promising innovative technology with the potential to boost distributed energy generation, due to high electrical efficiencies achieved, while keeping much lower environmental impact. In this context, the present study provides a steady-state model for a SOFC-GT architecture based on anode gas recirculation concept, with glycerol being used as a fuel. The developed code allows calculating heat and mass balance using system analysis by modeling each module, namely, reformer, SOFC stack, afterburner, heat exchanger, anode gas recirculation blower, turbine and air compressor. Adiabatic reformer was modeled according to entropy maximization technique, allowing a more straightforward integration with SOFC anode, ensuring a faster code execution. The whole process flowsheet diagram (PFD) is provided for a designed 200kW AC SOFC-GT system, yielding 66.6% electrical efficiency. Such a high efficiency is achieved for pressurized system (8 atm), SOFC stack composed of 500 cells, at a power density of 0.75 W cm −2 and single cell voltage of 0.842V. Enhanced electrochemical performance is obtained with the utilization of a new generation of metal-supported SOFC, based on optimized materials LSCM/YSZ/SDCN (lanthanum strontium manganite/yttria stabilized zirconia/samaria-doped ceria mixed with Ni). In addition, two-stage compression and expansion, with proper selection of rotor diameter sizes besides a fully electric technology, could result in compressors and turbines efficiencies of approximately 83% and 85%, respectively.

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“…Fossil fuel consumption and emissions may be reduced by using solar-based technologies. For electricity generation, solar energy may be used directly (photovoltaic panels) or indirectly utilizing biofuels [3][4][5] applying, for example, fuel cell technology which additionally features high efficiency due to the direct transformation of chemical energy into electricity [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, the largest market for solar energy is now connected with the absorption of solar radiation to heat up media that are flowing through solar collectors.…”

Section: Introductionmentioning

confidence: 99%

Identification of the objective function for optimization of a seasonal thermal energy storage system

Milewski¹,

Szabłowski²,

Bujalski³

2014

Archives of Thermodynamics

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The article shows the proposed solution of the objective function for the seasonal thermal energy storage system. In order to develop this function the technological and economic assumptions were used. In order to select the optimal system configuration mathematical models of the main elements of the system were built. Using these models, and based on the selected design point, the simulation of the entire system for randomly generated outside temperatures was made. The proposed methodology and obtained relationships can be readily used for control purposes, constituting model predicted control (MPC).

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Hybrid Fuel Cell Gas Turbine System Design and Optimization

Cited by 33 publications

References 23 publications

Fuel utilization effects on system efficiency in solid oxide fuel cell gas turbine hybrid systems

Fuel utilization effects on system efficiency in solid oxide fuel cell gas turbine hybrid systems

Aproveitamento Energético Eficiente Do Glicerol – Modelamento No Estado Estacionário De Sistema Híbrido De Células a Combustível Do Tipo Óxido Sólido E Turbina a Gás

Identification of the objective function for optimization of a seasonal thermal energy storage system

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