Analysis of a pressurized solid oxide fuel cell–gas turbine hybrid power system with cathode gas recirculation

Saebea, Dang; Patcharavorachot, Yaneeporn; Assabumrungrat, Suttichai; Arpornwichanop, Amornchai

doi:10.1016/j.ijhydene.2013.01.146

Cited by 36 publications

(9 citation statements)

References 27 publications

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“…𝜂 sys, 𝑡ℎ = 𝑃 Th 𝑛 𝑁𝐺 ⋅ LHV NG (9) 𝜂 sys, tot = 𝑃 AC,elec + 𝑃 Th 𝑛 𝑁𝐺 ⋅ LHV NG (10) where P AC, net represents the net AC output power, P th is the thermal power output, n NG is the molar flow rate of the external input fuel, and LHV NG is the low heating value of the fuel. The S/C is an important design parameter for the system, and the S/C can be defined by the following equation [20].…”

Section: System Performance Characterizationmentioning

confidence: 99%

Performance analysis of a natural gas‐fueled 1 kW solid oxide fuel cell‐combined heat and power system with off‐gas recirculation of anode and cathode

Zhu

Bai

et al. 2022

Fuel Cells

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Both anode off‐gas recirculation (AOGR) and cathode off‐gas recirculation (COGR) can increase the performance of solid oxide fuel cell‐combined heat and power (SOFC‐CHP) systems on their own, however, they both have unavoidable drawbacks. Thus, the combined effect of both on the system is worth investigating. The essential challenge is to figure out what the best AOGR and COGR ratios are under the combined situation. In this paper, the effects of varied AOGR ratios and COGR ratios on the system performance were investigated. A model of a 1 kW natural gas‐fueled SOFC‐CHP system was constructed which uses Cycle‐Tempo software. It is demonstrated that moderate AOGR can improve the net electrical efficiency, but too much AOGR will reduce the H2 concentration at the anode inlet and prevent the stack from working properly; moderate COGR can improve the thermal efficiency, but too much COGR can lead to large changes in current density variation and cause drastic changes in current, which affects the system and external electrical equipment. While, combining AOGR with COGR can improve both the net electrical and thermal efficiency, which results in higher total efficiency. As a result, the combined configuration of an AOGR ratio of 0.4 and a COGR ratio of 0.4 is recommended. In this scenario, the net electrical efficiency of the system is 47.38%, the thermal efficiency is 28.98%, the total efficiency is 76.37%, and the actual fuel utilization rate is 0.834.

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Section: System Performance Characterizationmentioning

confidence: 99%

Performance analysis of a natural gas‐fueled 1 kW solid oxide fuel cell‐combined heat and power system with off‐gas recirculation of anode and cathode

Zhu

Bai

et al. 2022

Fuel Cells

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“…Then, a high‐temperature exhaust gas produced from SOFC can be further supplied to the other required heat units in the integrated system. This can improve the thermal efficiency of the overall system 29 . Furthermore, the investigation of an integrated system can extend to the design of the heat integration or heat exchanger network to minimize the energy demand in the system 30 …”

Section: Introductionmentioning

confidence: 99%

“…This can improve the thermal efficiency of the overall system. 29 Furthermore, the investigation of an integrated system can extend to the design of the heat integration or heat exchanger network to minimize the energy demand in the system. 30 This study aims to propose a power system consisting of SOFC and SCWR-G.…”

mentioning

confidence: 99%

Performance assessment of a 10 kW pressurized solid oxide fuel cell integrated with glycerol supercritical water reforming

Patcharavorachot

Chatrattanawet

Saebea

et al. 2022

Intl J of Energy Research

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Summary In this work, the integrated system of pressurized solid oxide fuel cell (SOFC) and supercritical water reforming of glycerol was proposed. The syngas from the reforming process has high temperature and pressure and thus, it can be used as fuel for the SOFC. The performance of an integrated system was determined through the Aspen Plus simulator in which the electrochemical equations were also included. The developed model was employed to examine the performance of the integrated system with respect to the wider ranges of operation of the reformer and SOFC. In this work, the desired power output of an SOFC stack is set as 10 kW and thus, the area of an SOFC is determined. A smaller area is required as it normally leads to a lower fabrication cost for the SOFC. The simulation results revealed that the smallest SOFC area can be provided when the reformer is operated at 800°C and 240 atm with a ratio of supercritical water to glycerol as 50 whereas the SOFC operation is at 900°C and 4 atm with the current density as 7000 A/m2. Under these operating conditions, the integrated system can provide the cell voltage, required area, fuel utilization, and SOFC efficiency as 1 V, 1.42 m2, 75% and 61%, respectively. From the exergy analysis, it was found that the compressor, heater, and turbine are the highest exergy destruction units whereas the reformer has the lowest exergy destruction, followed by the SOFC stack.

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“…When considering a performance of the system, it is found that a heat input is highly required to preheat air before being fed to the SOFC stack. The recirculation of a high temperature cathode exhaust gas is probably an interesting option to reduce the requirement of an external heat for the SOFC-GT system (Saebea et al 2012;Saebea et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Comparison between conventional design and cathode gas recirculation design of a direct-syngas solid oxide fuel cell–gas turbine hybrid systems part II: Effect of temperature difference at the fuel cell stack

Azami

Yari

2018

Int. J. Renew. Energy Dev.

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This study focuses on the effect of the temperature difference at the fuel cell stack (ΔTcell) on the performances of the two types of SOFC–GT hybrid system configurations, with and without cathode gas recirculation system. In order to investigation the effect of matching between the SOFC temperature (TSOFC) and the turbine inlet temperature (TIT) on the hybrid system performance, we considered additional fuel supply to the combustor as well as cathode gas recirculation system after the air preheater. Simulation results show that the system with cathode gas recirculation gives better efficiency and power capacity for all design conditions than the system without cathode gas recirculation under the same constraints. As the temperature difference at the cell becomes smaller, the both systems performance generally degrade. However the system with cathode gas recirculation is less influenced by the constraint of the cell temperature difference. The model and simulation of the proposed SOFC–GT hybrid systems have been performed with Cycle-Tempo software.Article History: Received January 16th 2018; Received in revised form July 4th 2018; Accepted October 5th 2018; Available onlineHow to Cite This Article: Azami, V and Yari, M. (2018) Comparison Between Conventional Design and Cathode Gas Recirculation Design of a Direct-Syngas Solid Oxide Fuel Cell–Gas Turbine Hybrid Systems Part II: Effect of Temperature Difference at The Fuel Cell Stack. International Journal of Renewable Energy Development, 7(3), 263-267.http://dx.doi.org/10.14710/ijred.7.3.263-267

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Analysis of a pressurized solid oxide fuel cell–gas turbine hybrid power system with cathode gas recirculation

Cited by 36 publications

References 27 publications

Performance analysis of a natural gas‐fueled 1 kW solid oxide fuel cell‐combined heat and power system with off‐gas recirculation of anode and cathode

Performance analysis of a natural gas‐fueled 1 kW solid oxide fuel cell‐combined heat and power system with off‐gas recirculation of anode and cathode

Performance assessment of a 10 kW pressurized solid oxide fuel cell integrated with glycerol supercritical water reforming

Comparison between conventional design and cathode gas recirculation design of a direct-syngas solid oxide fuel cell–gas turbine hybrid systems part II: Effect of temperature difference at the fuel cell stack

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