Experimental study of SOFC system heat-up without safety gases

Matias Halinen (Corresponding Author), Olivier Thomann, Jari Kiviaho

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Premixed safety gas is conventionally used to keep the anode of a solid oxide fuel cell (SOFC) under reducing conditions during heat-up. This article presents the results of an experimental study to heat up a SOFC system and stack without the said premixed safety gases, i.e. by utilizing a natural gas pre-reformer and anode off-gas recycling (AOGR). Firstly, ex-situ experiments were conducted to investigate the operability of a pre-reformer during system heat-up. It was found that any oxygen fed to the reformer hinders the reforming reactions at low temperatures. Secondly, based on the ex-situ findings, series of heat-up cycles were conducted with a complete 10 kW system using AOGR and a planar SOFC stack. In these experiments it was found that the system heat-up is possible with fuel gas and steam only, without the need for premixed reducing safety gases. Use of the fuel gas instead of a premixed safety gas did not result in a significant performance loss in the SOFC stack. Therefore, such a heat-up strategy was developed for SOFC systems that reduces the need of premixed safety gas storage space and thus decreases the system cost.
Original languageEnglish
Pages (from-to)552-561
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number1
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
safety
heat
Gases
gases
Anodes
Gas fuels
Recycling
anodes
recycling
Reforming reactions
space storage
Hot Temperature
Natural gas
Steam
Experiments
natural gas
steam
Oxygen

Keywords

  • anode off-gas recycling
  • heat-up
  • reformer
  • solid oxide fuel cell
  • start-up
  • system

Cite this

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title = "Experimental study of SOFC system heat-up without safety gases",
abstract = "Premixed safety gas is conventionally used to keep the anode of a solid oxide fuel cell (SOFC) under reducing conditions during heat-up. This article presents the results of an experimental study to heat up a SOFC system and stack without the said premixed safety gases, i.e. by utilizing a natural gas pre-reformer and anode off-gas recycling (AOGR). Firstly, ex-situ experiments were conducted to investigate the operability of a pre-reformer during system heat-up. It was found that any oxygen fed to the reformer hinders the reforming reactions at low temperatures. Secondly, based on the ex-situ findings, series of heat-up cycles were conducted with a complete 10 kW system using AOGR and a planar SOFC stack. In these experiments it was found that the system heat-up is possible with fuel gas and steam only, without the need for premixed reducing safety gases. Use of the fuel gas instead of a premixed safety gas did not result in a significant performance loss in the SOFC stack. Therefore, such a heat-up strategy was developed for SOFC systems that reduces the need of premixed safety gas storage space and thus decreases the system cost.",
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Experimental study of SOFC system heat-up without safety gases. / Halinen, Matias (Corresponding Author); Thomann, Olivier; Kiviaho, Jari.

In: International Journal of Hydrogen Energy, Vol. 39, No. 1, 2014, p. 552-561.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimental study of SOFC system heat-up without safety gases

AU - Halinen, Matias

AU - Thomann, Olivier

AU - Kiviaho, Jari

PY - 2014

Y1 - 2014

N2 - Premixed safety gas is conventionally used to keep the anode of a solid oxide fuel cell (SOFC) under reducing conditions during heat-up. This article presents the results of an experimental study to heat up a SOFC system and stack without the said premixed safety gases, i.e. by utilizing a natural gas pre-reformer and anode off-gas recycling (AOGR). Firstly, ex-situ experiments were conducted to investigate the operability of a pre-reformer during system heat-up. It was found that any oxygen fed to the reformer hinders the reforming reactions at low temperatures. Secondly, based on the ex-situ findings, series of heat-up cycles were conducted with a complete 10 kW system using AOGR and a planar SOFC stack. In these experiments it was found that the system heat-up is possible with fuel gas and steam only, without the need for premixed reducing safety gases. Use of the fuel gas instead of a premixed safety gas did not result in a significant performance loss in the SOFC stack. Therefore, such a heat-up strategy was developed for SOFC systems that reduces the need of premixed safety gas storage space and thus decreases the system cost.

AB - Premixed safety gas is conventionally used to keep the anode of a solid oxide fuel cell (SOFC) under reducing conditions during heat-up. This article presents the results of an experimental study to heat up a SOFC system and stack without the said premixed safety gases, i.e. by utilizing a natural gas pre-reformer and anode off-gas recycling (AOGR). Firstly, ex-situ experiments were conducted to investigate the operability of a pre-reformer during system heat-up. It was found that any oxygen fed to the reformer hinders the reforming reactions at low temperatures. Secondly, based on the ex-situ findings, series of heat-up cycles were conducted with a complete 10 kW system using AOGR and a planar SOFC stack. In these experiments it was found that the system heat-up is possible with fuel gas and steam only, without the need for premixed reducing safety gases. Use of the fuel gas instead of a premixed safety gas did not result in a significant performance loss in the SOFC stack. Therefore, such a heat-up strategy was developed for SOFC systems that reduces the need of premixed safety gas storage space and thus decreases the system cost.

KW - anode off-gas recycling

KW - heat-up

KW - reformer

KW - solid oxide fuel cell

KW - start-up

KW - system

U2 - 10.1016/j.ijhydene.2013.10.043

DO - 10.1016/j.ijhydene.2013.10.043

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SN - 0360-3199

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