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Fuel Cell Temperature Control with a Pre-Combustor in SOFC Gas Turbine Hybrids during Load Changes
U.S. Department of Energy, US. (Future Energy Center)ORCID-id: 0000-0001-6101-2863
Arizona State University, USA.
U.S. Department of Energy, US.
2017 (engelsk)Inngår i: Journal of electrochemical energy conversion and storage, ISSN 2381-6872, Vol. 14, s. 031006-031014Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The use of high temperature fuel cells, such as Solid Oxide Fuel Cells (SOFCs), for power generation is considered a very efficient and clean solution to conservation of energy resources. When the SOFC is coupled with a gas turbine, the global system efficiency can go beyond 70% on natural gas LHV. However, durability of the ceramic material and system operability can be significantly penalized by thermal stresses due to temperature fluctuations and non-even temperature distributions. Thermal management of the cell during load following is therefore essential.The purpose of this work was to develop and test a pre-combustor model for real-time applications in hardware-based simulations, and to implement a control strategy to keep constant cathode inlet temperature during different operative conditions. The real-time model of the pre-combustor was incorporated into the existing SOFC model and tested in a hybrid system facility, where a physical gas turbine and hardware components were coupled with a cyber-physical fuel cell for flexible, accurate, and cost-reduced simulations.The control of the fuel flow to the pre-combustor was proven to be effective in maintaining a constant cathode inlet temperature during a step change in fuel cell load. With a 20 A load variation, the maximum temperature deviation from the nominal value was below 0.3% (3K). Temperature gradients along the cell were maintained below 10 K/cm. An efficiency analysis was performed in order to evaluate the impact of the pre-combustor on the overall system efficiency.

sted, utgiver, år, opplag, sider
2017. Vol. 14, s. 031006-031014
Emneord [en]
SOFC, hybrid system, control, dynamics
HSV kategori
Forskningsprogram
energi- och miljöteknik
Identifikatorer
URN: urn:nbn:se:mdh:diva-37169DOI: 10.1115/1.4036809OAI: oai:DiVA.org:mdh-37169DiVA, id: diva2:1153985
Tilgjengelig fra: 2017-11-01 Laget: 2017-11-01 Sist oppdatert: 2018-01-26bibliografisk kontrollert

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