Gas Turbine Assessment for Air Management of Pressurized SOFC/GT Hybrid Systems
Author:
Traverso Alberto1, Massardo Aristide1, Roberts Rory A.2, Brouwer Jack2, Samuelsen Scott2
Affiliation:
1. Thermochemical Power Group, University of Genova, via Montallegro 1, 16145 Genova, Italy 2. National Fuel Cell Research Center, University of California, Irvine, CA 92697-3550
Abstract
This paper analyzes and compares transient and steady-state performance characteristics of different types of single-shaft turbo-machinery for controlling the air through a pressurized solid oxide fuel cell (SOFC) stack that is integrated into a SOFC/GT pressurized hybrid system. Analyses are focused on the bottoming part of the cycle, where the gas turbine (GT) has the role of properly managing airflow to the SOFC stack for various loads and at different ambient conditions. Analyses were accomplished using two disparate computer programs, which each modeled a similar SOFC/GT cycle using identical generic gas turbine performance maps. The models are shown to provide consistent results, and they are used to assess: (1) the influence of SOFC exhaust composition on expander behavior for on-design conditions, (2) the off-design performance of the bypass, bleed, and variable speed controls for various part-load conditions and for different ambient conditions; (3) the features of such controls during abrupt transients such as load trip and bypass/bleed valve failure. The results show that a variable speed microturbine is the best option for off-design operation of a SOFC/GT hybrid system. For safety measures a bleed valve provides adequate control of the system during load trip. General specifications for a radial GT engine for integration with a 550kW pressurized SOFC stack are identified, which allow operation under a wide range of ambient conditions as well as several different cycle configurations.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Reference12 articles.
1. Roberts, R. A., and Brouwer, J., 2005, “Dynamic Simulation of a Pressurized 220kW Solid Oxide Fuel Cell-Gas Turbine Hybrid System: Modeled Performance Compared to Measured Results,” J. Fuel Cell Sci. Technol.1550-624X, in review. 2. Roberts, R. A., et al., 2005, “Development of Controls for Dynamic Operation of Carbonate Fuel Cell-Gas Turbine Hybrid Systems,” ASME Paper No. GT2005-68774. 3. Modelling of Pressurised Hybrid Systems Based on Integrated Planar Solid Oxide Fuel Cells (IP-SOFC) Technology,” Topical Issue “Modelling of Fuel Cell Systems;Magistri 4. Ferrari, M., Traverso, A., and Massardo, A. F., 2005, “Control System For Solid Oxide Fuel Cell Hybrid Systems,” ASME Paper No. 2005-GT-68102. 5. Litzinger, K. P., Veyo, S. E., Shockling, L. A., and Lundberg, W. L., 2005, “Comparative Evaluation of SOFC/Gas Turbine Hybrid System Options,” ASME Paper No. GT2005-68909.
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