Cycle analysis of combined power generation by planar SOFC and gas turbine considering cell temperature and current density distributions

Kazuo Onda, Toru Iwanari, Nobuhiro Miyauchi, Kohei Ito, Takahiro Ohba, Yoshinori Sakaki, Susumu Nagata

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The planar solid oxide fuel cell (SOFC) with a Y2O3-stabilized ZrO2 electrolyte is expected to be a candidate for distributed power sources in the next generation due to its high efficiency of power generation. In this study, we analyzed the system performance of a SOFC/gas turbine combined cycle of about 500 kW electrical output, using our two-dimensional simulation code for the planar SOFC with internal reformer. The effects of cell temperature, cell pressure, recirculation rations of fuel and air, utilization ratios of fuel and air, and average current density of SOFC on both the system efficiency and the cell temperature and current density distributions, were calculated under typical operating conditions taking account of realistic efficiencies and heat losses for auxiliary equipment. The addition of a Cheng cycle to the SOFC/gas turbine combined cycle improved system efficiency by 1-3%. The combined SOFC/gas turbine/Cheng cycle gave a high efficiency of 61.2% (based on a higher heating value) even under a small power generation scale of 500 kW class at 2.0 MPa SOFC pressure. We also discussed the possibility of carbon deposition at both external and internal reformers by calculating the chemical equilibrium carbon activities for estimated carbon deposition reactions.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume150
Issue number12
DOIs
Publication statusPublished - Dec 1 2003
Externally publishedYes

Fingerprint

Gas fuels
gas turbines
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Power generation
Gas turbines
density distribution
Current density
current density
cycles
cells
Carbon
Temperature
temperature
carbon
Auxiliary equipment
rations
air
Air
Heat losses

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Cycle analysis of combined power generation by planar SOFC and gas turbine considering cell temperature and current density distributions. / Onda, Kazuo; Iwanari, Toru; Miyauchi, Nobuhiro; Ito, Kohei; Ohba, Takahiro; Sakaki, Yoshinori; Nagata, Susumu.

In: Journal of the Electrochemical Society, Vol. 150, No. 12, 01.12.2003.

Research output: Contribution to journalArticle

Onda, Kazuo ; Iwanari, Toru ; Miyauchi, Nobuhiro ; Ito, Kohei ; Ohba, Takahiro ; Sakaki, Yoshinori ; Nagata, Susumu. / Cycle analysis of combined power generation by planar SOFC and gas turbine considering cell temperature and current density distributions. In: Journal of the Electrochemical Society. 2003 ; Vol. 150, No. 12.
@article{ef83d9a03bff474798dbc98cb8a9c842,
title = "Cycle analysis of combined power generation by planar SOFC and gas turbine considering cell temperature and current density distributions",
abstract = "The planar solid oxide fuel cell (SOFC) with a Y2O3-stabilized ZrO2 electrolyte is expected to be a candidate for distributed power sources in the next generation due to its high efficiency of power generation. In this study, we analyzed the system performance of a SOFC/gas turbine combined cycle of about 500 kW electrical output, using our two-dimensional simulation code for the planar SOFC with internal reformer. The effects of cell temperature, cell pressure, recirculation rations of fuel and air, utilization ratios of fuel and air, and average current density of SOFC on both the system efficiency and the cell temperature and current density distributions, were calculated under typical operating conditions taking account of realistic efficiencies and heat losses for auxiliary equipment. The addition of a Cheng cycle to the SOFC/gas turbine combined cycle improved system efficiency by 1-3{\%}. The combined SOFC/gas turbine/Cheng cycle gave a high efficiency of 61.2{\%} (based on a higher heating value) even under a small power generation scale of 500 kW class at 2.0 MPa SOFC pressure. We also discussed the possibility of carbon deposition at both external and internal reformers by calculating the chemical equilibrium carbon activities for estimated carbon deposition reactions.",
author = "Kazuo Onda and Toru Iwanari and Nobuhiro Miyauchi and Kohei Ito and Takahiro Ohba and Yoshinori Sakaki and Susumu Nagata",
year = "2003",
month = "12",
day = "1",
doi = "10.1149/1.1619986",
language = "English",
volume = "150",
journal = "Journal of the Electrochemical Society",
issn = "0013-4651",
publisher = "Electrochemical Society, Inc.",
number = "12",

}

TY - JOUR

T1 - Cycle analysis of combined power generation by planar SOFC and gas turbine considering cell temperature and current density distributions

AU - Onda, Kazuo

AU - Iwanari, Toru

AU - Miyauchi, Nobuhiro

AU - Ito, Kohei

AU - Ohba, Takahiro

AU - Sakaki, Yoshinori

AU - Nagata, Susumu

PY - 2003/12/1

Y1 - 2003/12/1

N2 - The planar solid oxide fuel cell (SOFC) with a Y2O3-stabilized ZrO2 electrolyte is expected to be a candidate for distributed power sources in the next generation due to its high efficiency of power generation. In this study, we analyzed the system performance of a SOFC/gas turbine combined cycle of about 500 kW electrical output, using our two-dimensional simulation code for the planar SOFC with internal reformer. The effects of cell temperature, cell pressure, recirculation rations of fuel and air, utilization ratios of fuel and air, and average current density of SOFC on both the system efficiency and the cell temperature and current density distributions, were calculated under typical operating conditions taking account of realistic efficiencies and heat losses for auxiliary equipment. The addition of a Cheng cycle to the SOFC/gas turbine combined cycle improved system efficiency by 1-3%. The combined SOFC/gas turbine/Cheng cycle gave a high efficiency of 61.2% (based on a higher heating value) even under a small power generation scale of 500 kW class at 2.0 MPa SOFC pressure. We also discussed the possibility of carbon deposition at both external and internal reformers by calculating the chemical equilibrium carbon activities for estimated carbon deposition reactions.

AB - The planar solid oxide fuel cell (SOFC) with a Y2O3-stabilized ZrO2 electrolyte is expected to be a candidate for distributed power sources in the next generation due to its high efficiency of power generation. In this study, we analyzed the system performance of a SOFC/gas turbine combined cycle of about 500 kW electrical output, using our two-dimensional simulation code for the planar SOFC with internal reformer. The effects of cell temperature, cell pressure, recirculation rations of fuel and air, utilization ratios of fuel and air, and average current density of SOFC on both the system efficiency and the cell temperature and current density distributions, were calculated under typical operating conditions taking account of realistic efficiencies and heat losses for auxiliary equipment. The addition of a Cheng cycle to the SOFC/gas turbine combined cycle improved system efficiency by 1-3%. The combined SOFC/gas turbine/Cheng cycle gave a high efficiency of 61.2% (based on a higher heating value) even under a small power generation scale of 500 kW class at 2.0 MPa SOFC pressure. We also discussed the possibility of carbon deposition at both external and internal reformers by calculating the chemical equilibrium carbon activities for estimated carbon deposition reactions.

UR - http://www.scopus.com/inward/record.url?scp=0346390739&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0346390739&partnerID=8YFLogxK

U2 - 10.1149/1.1619986

DO - 10.1149/1.1619986

M3 - Article

VL - 150

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 12

ER -