Performance evaluation of solid oxide fuel cell for exergy recuperation of exhaust heat by electrochemical partial oxidation

Takayuki Ozeki, Takao Nakagaki

Research output: Contribution to journalArticle

Abstract

Electrochemical partial oxidation (EPOx) of methane can convert exhaust heat into electricity as much as difference between change of Gibbs free energy and change of enthalpy. To quantify recuperated heat and converted electric power of EPOx, we simulated the performance of EPOx in the microtubular Solid Oxide Fuel Cell (SOFC) using Gadolinium Doped Ceria as electrolyte. The quasi-two dimensional and non-isothermal model applied to this SOFC simulation, which consisted of three solid layers and two gas layers, considering with mass, energy and chemical species conservation equations as well as detailed electrochemical reaction. The simulation computed temperature and current density distributions, and evaluated energy flow in SOFC. The simulation code was validated by consistency between the simulation result of power generation using H2 as fuel and the result of previous experimental report. The results showed that EPOx could convert 40% of theoretically recuperated heat into the electric power at the operation condition maximizing total regenerated heat.

Original languageEnglish
Pages (from-to)1583-1593
Number of pages11
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume79
Issue number804
DOIs
Publication statusPublished - 2013
Externally publishedYes

Fingerprint

exergy
Exergy
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
heat
Oxidation
oxidation
evaluation
electric power
Enthalpy
simulation
Gadolinium
conservation equations
Cerium compounds
Gibbs free energy
gadolinium
electricity
Power generation
density distribution
Conservation

Keywords

  • Electrochemical partial oxidation
  • Exergy recuperation
  • Numerical analysis
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

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title = "Performance evaluation of solid oxide fuel cell for exergy recuperation of exhaust heat by electrochemical partial oxidation",
abstract = "Electrochemical partial oxidation (EPOx) of methane can convert exhaust heat into electricity as much as difference between change of Gibbs free energy and change of enthalpy. To quantify recuperated heat and converted electric power of EPOx, we simulated the performance of EPOx in the microtubular Solid Oxide Fuel Cell (SOFC) using Gadolinium Doped Ceria as electrolyte. The quasi-two dimensional and non-isothermal model applied to this SOFC simulation, which consisted of three solid layers and two gas layers, considering with mass, energy and chemical species conservation equations as well as detailed electrochemical reaction. The simulation computed temperature and current density distributions, and evaluated energy flow in SOFC. The simulation code was validated by consistency between the simulation result of power generation using H2 as fuel and the result of previous experimental report. The results showed that EPOx could convert 40{\%} of theoretically recuperated heat into the electric power at the operation condition maximizing total regenerated heat.",
keywords = "Electrochemical partial oxidation, Exergy recuperation, Numerical analysis, Solid oxide fuel cell",
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AU - Ozeki, Takayuki

AU - Nakagaki, Takao

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N2 - Electrochemical partial oxidation (EPOx) of methane can convert exhaust heat into electricity as much as difference between change of Gibbs free energy and change of enthalpy. To quantify recuperated heat and converted electric power of EPOx, we simulated the performance of EPOx in the microtubular Solid Oxide Fuel Cell (SOFC) using Gadolinium Doped Ceria as electrolyte. The quasi-two dimensional and non-isothermal model applied to this SOFC simulation, which consisted of three solid layers and two gas layers, considering with mass, energy and chemical species conservation equations as well as detailed electrochemical reaction. The simulation computed temperature and current density distributions, and evaluated energy flow in SOFC. The simulation code was validated by consistency between the simulation result of power generation using H2 as fuel and the result of previous experimental report. The results showed that EPOx could convert 40% of theoretically recuperated heat into the electric power at the operation condition maximizing total regenerated heat.

AB - Electrochemical partial oxidation (EPOx) of methane can convert exhaust heat into electricity as much as difference between change of Gibbs free energy and change of enthalpy. To quantify recuperated heat and converted electric power of EPOx, we simulated the performance of EPOx in the microtubular Solid Oxide Fuel Cell (SOFC) using Gadolinium Doped Ceria as electrolyte. The quasi-two dimensional and non-isothermal model applied to this SOFC simulation, which consisted of three solid layers and two gas layers, considering with mass, energy and chemical species conservation equations as well as detailed electrochemical reaction. The simulation computed temperature and current density distributions, and evaluated energy flow in SOFC. The simulation code was validated by consistency between the simulation result of power generation using H2 as fuel and the result of previous experimental report. The results showed that EPOx could convert 40% of theoretically recuperated heat into the electric power at the operation condition maximizing total regenerated heat.

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