Narayana Sarma, Rakesh and Shivapuji, Anand M and Srinivasaiah, Dasappa (2022) Solid oxide fuel cells fueled by carbonaceous fuels: A thermodynamics-based approach for safe operation and experimental validation. In: Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 44 (2). pp. 3509-3531. ISSN 1556-7036
Full text not available from this repository.Abstract
Solid Oxide Fuel Cells (SOFCs) can operate with carbonaceous fuels. However, experiments indicate possible carbon deposition or coking on Ni-based anodes. Thermodynamic equilibrium calculations with NASA computer program CEA (Chemical Equilibrium with Applications) for typical SOFC operating temperatures predict graphitic carbon (C(gr)) formation. While fuel humidification eliminates coking, excess steam degrades Ni-based anode, necessitating suitable steam supply for safe operation. Thermodynamic approach is validated using experiments on 25 mm diameter electrolyte-supported NextCell-HP SOFC button cell fueled by H2 and simulated syngas (CO and H2). The use of 1 SLPM H2 (fuel) with 4 SLPM air (oxidant) provides peak power density of ~1000 mW cm−2. With simulated syngas fuel, cell performance drops. In-situ diagnosis with steam supply to anode suggests carbon deposition based on detection of H2 and CO in tail gas. Equilibrium analysis suggests carbon-free operation by humidifying simulated syngas (CO:H2 = 1:3 molar ratio) with ~5% steam by volume, at 973 K and above. Further experiments are conducted on a fresh cell. Simulated syngas (CO:H2 = 1:3 volumetric ratio) with ~5% steam by volume provides safe cell operation. The study provides a pathway to safely utilize carbonaceous fuels in SOFC by suitable humidification, coupling thermodynamic analyses and experiments.
| Item Type: | Journal Article |
|---|---|
| Publication: | Energy Sources, Part A: Recovery, Utilization, and Environmental Effects |
| Publisher: | Taylor and Francis Ltd. |
| Additional Information: | The copyright of this article belongs to the Taylor and Francis Ltd. |
| Keywords: | carbon deposition; carbon monoxide; fuel humidification; hydrogen; Solid oxide fuel cell; syngas |
| Department/Centre: | Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA) |
| Date Deposited: | 23 May 2022 04:37 |
| Last Modified: | 23 May 2022 04:37 |
| URI: | https://eprints.iisc.ac.in/id/eprint/72414 |
Actions (login required)
 |
View Item |
