Analysis of the influence of heat transfer on the stationary operation and performance of a solid oxide fuel cell/gas turbine hybrid power plant

Steilen, Mike; Saletti, Costanza; Heddrich, Marc P.; Friedrich, K. Andreas

doi:10.1016/j.apenergy.2017.11.038

Cited by 22 publications

(11 citation statements)

References 33 publications

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“…However, the high temperature exhaust gas from the SOFC off-gas combustor provides enough enthalpy for the turbine to not only power the compressor but also to power a generator with a maximum output of 3 kW el . The HyPP demonstrator model was created with the in-house simulation tool Micro Gas Turbine Steady State Simulator (MGTS 3 ). This is a modular Matlab/Simulink based tool which was introduced by Panne et.…”

Section: Simulation Setupmentioning

confidence: 99%

“…An important question regarding the use of biogas in a HyPP is the influence on the operating range. It is determined by several limits of process quantities [3]:…”

Section: Hypp Process Quantites Limitationsmentioning

confidence: 99%

“…Hence, they can be employed decentralized, wherever there is demand for waste heat. HyPP also support a wide operating range relying on natural gas [3]. Whether the same can be achieved with biogas and whether HyPP can handle the strongly fluctuating calorific value are decisive factors for the successful positioning of the technology in a future CO 2 -neutral energy market.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of operating range and SOFC-off-gas combustor requirements of a biogas powered SOFC-MGT hybrid power plant

et al. 2018

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Hybrid Power plants (HyPP) combining a micro gas turbine with a solid oxide fuel cell are projected to reach very high electric efficiency values. Powered by biogas, they have the potential to become an important pillar for a future CO 2-neutral energy mix. However, to compensate the fluctuating energy yield of wind turbines and photovoltaic power plants they should also provide a wide operating range. While previous numerical studies show that this is the case for natural gas powered HyPP, the impact of biogas utilization on the operating range was still unknown. In the present study, a detailed numeric model of the HyPP being constructed at DLR is presented. The model is used for an in-depth investigation of the operating limits using biogases with various methane contents. The influence of fuel cell operating limits, like the stack temperature, minimal cell voltage and maximal fuel utilization rate, on the HyPP operation range are discussed. While the results show a strong correlation between methane content and operation range, a power output reduction of 33 % is still feasible for methane contents as low as 60 vol%. Knowing the operating range of the HyPP is also crucial for the design of the plants components. Hence, in a final step the operating conditions for the fuel cell off-gas combustor are derived for the respective operating ranges.

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Section: Simulation Setupmentioning

confidence: 99%

“…An important question regarding the use of biogas in a HyPP is the influence on the operating range. It is determined by several limits of process quantities [3]:…”

Section: Hypp Process Quantites Limitationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of operating range and SOFC-off-gas combustor requirements of a biogas powered SOFC-MGT hybrid power plant

et al. 2018

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“…Recuperators and water heat exchangers are calculated assuming a constant efficiency [1,17]. Other components implemented in MGTS 3 are combustion chambers [3], piping, flow branchings and mixers with or without recirculation, fuel cell models [3,5] and generators [17].…”

Section: Components Overviewmentioning

confidence: 99%

“…Figure 2 shows the structure and most important components of the HyPP steady state model. The fuel cell is placed inside a pressure vessel which is purged by pressurized air [5]. The MGTS 3 model of the HyPP describes the compressor and the turbine with turbomachinery maps derived from measurement data.…”

Section: Hybrid Power Plantmentioning

confidence: 99%

A Highly Flexible Approach on the Steady-State Analysis of Innovative Micro Gas Turbine Cycles

Krummrein

Henke

Kutne

2018

Journal of Engineering for Gas Turbines and Power

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Steady-state simulation is an important method to investigate thermodynamic processes. This is especially true for innovative micro gas turbine (MGT)-based cycles as the complexity of such systems grows. Therefore, steady-state simulation tools are required that ensure large flexibility and computation robustness. As the increased system complexity result often in more extensive parameter studies also a fast computation speed is required. While a number of steady-state simulation tools for MGT-based systems are described and applied in literature, the solving process of such tools is rarely explained. However, this solving process is crucial to achieve a robust and fast computation within a physically meaningful range. Therefore, a new solver routine for a steady-state simulation tool developed at the DLR Institute of Combustion Technology is presented in detail in this paper. The solver routine is based on Broyden's method. It considers boundaries during the solving process to maintain a physically and technically meaningful solution process. Supplementary methods are implemented and described which improve the computation robustness and speed. Furthermore, some features of the resulting steady-state simulation tool are presented. Exemplary applications of a hybrid power plant (HyPP), an inverted Brayton cycle (IBC), and an aircraft auxiliary power unit (APU) show the capabilities of the presented solver routine and the steady-state simulation tool. It is shown that the new solver routine is superior to the standard Simulink algebraic solver in terms of system evaluation and robustness for the given applications.

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Modeling of a Novel Atmospheric SOFC/GT Hybrid Process and Comparison with State‐of‐the‐Art SOFC System Concepts

et al. 2020

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A novel concept for an atmospheric solid oxide fuel cell (SOFC) hybrid system applying a sub-atmospheric gas turbine is proposed. Based on a developed process model suitable operating conditions are studied. The resulting performance is compared to different state-of-the-art SOFC system concepts. The comparison shows that pressurized SOFC/GT systems offer the highest electric efficiency. The novel concept as well as a two-stage SOFC system offer lower efficiencies, but still well above 60%. However, avoiding the complex system requirements of pressurized SOFC/GT systems, these concepts are promising for highly efficient electricity generation.

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Analysis of the influence of heat transfer on the stationary operation and performance of a solid oxide fuel cell/gas turbine hybrid power plant

Cited by 22 publications

References 33 publications

Numerical analysis of operating range and SOFC-off-gas combustor requirements of a biogas powered SOFC-MGT hybrid power plant

Numerical analysis of operating range and SOFC-off-gas combustor requirements of a biogas powered SOFC-MGT hybrid power plant

A Highly Flexible Approach on the Steady-State Analysis of Innovative Micro Gas Turbine Cycles

Modeling of a Novel Atmospheric SOFC/GT Hybrid Process and Comparison with State‐of‐the‐Art SOFC System Concepts

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