TY - GEN
T1 - Investigation of carbon deposition behavior on ferritic alloys in low S/C ratio using direct heating method
AU - Ito, Takuya
AU - Fujita, Kenjiro
AU - Matsuzaki, Yoshio
AU - Ueda, Mitsutoshi
AU - Maruyama, Toshio
N1 - Publisher Copyright:
Copyright © 2015 by The American Ceramic Society.
PY - 2014
Y1 - 2014
N2 - Preventing the deposition of carbon is one of the main challenges to achieving highly efficient operation of solid oxide fuel cell (SOFC) systems in low steam/carbon (S/C) environments. The carbon deposition can easily occur in the fuel gas supply line, when humidified methane with a S/C ratio of less than 1 is used as a fuel. By preventing this carbon deposition, it should be possible to develop robust SOFC systems with a high fuel to electricity conversion efficiency. Typically, ferritic Cr2O3- and Al2O3-forming alloys are the materials of choice for fuel gas supply lines in SOFC stacks and systems. This study therefore investigates the carbon deposition behavior on the oxide scale formed on me surface of such alloys, in order to clarify the mechanism of the carbon deposition. To achieve this, samples of ZMG232L and NCA-1 were directly heated up to 1173 K in the stream of a CH4-H2O gas mixture (S/C=0.02). The results show the A12O3 scale on NCA-l has a higher tolerance for the carbon deposition than the Cr2O3 scale on ZMG232L. On the basis of this, it is proposed that the optimized oxide scale on the alloy surface can effectively restrict carbon deposition in the low S/C environments.
AB - Preventing the deposition of carbon is one of the main challenges to achieving highly efficient operation of solid oxide fuel cell (SOFC) systems in low steam/carbon (S/C) environments. The carbon deposition can easily occur in the fuel gas supply line, when humidified methane with a S/C ratio of less than 1 is used as a fuel. By preventing this carbon deposition, it should be possible to develop robust SOFC systems with a high fuel to electricity conversion efficiency. Typically, ferritic Cr2O3- and Al2O3-forming alloys are the materials of choice for fuel gas supply lines in SOFC stacks and systems. This study therefore investigates the carbon deposition behavior on the oxide scale formed on me surface of such alloys, in order to clarify the mechanism of the carbon deposition. To achieve this, samples of ZMG232L and NCA-1 were directly heated up to 1173 K in the stream of a CH4-H2O gas mixture (S/C=0.02). The results show the A12O3 scale on NCA-l has a higher tolerance for the carbon deposition than the Cr2O3 scale on ZMG232L. On the basis of this, it is proposed that the optimized oxide scale on the alloy surface can effectively restrict carbon deposition in the low S/C environments.
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M3 - Conference contribution
AN - SCOPUS:84922532094
SN - 9781119040439
T3 - Ceramic Engineering and Science Proceedings
SP - 33
EP - 40
BT - Advances in Solid Oxide Fuel Cells X
A2 - Bansa, Narottam P.
A2 - Kusnezoff, Mihails
PB - American Ceramic Society
T2 - 11th International Symposium on Solid Oxide Fuel Cells: Materials, Science and Technology, SOFC 2014 - 38th International Conference on Advanced Ceramics and Composites, ICACC 2014
Y2 - 26 January 2014 through 31 January 2014
ER -