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The paper evaluates air flow management and control in a fuel cell gas turbine hybrid power system using the Hybrid Performance hardware simulation facility. The study focuses on improving thermal management in the fuel cell component, especially during load transients, through cathode air flow control. Two methods for air flow control are presented, including diverting air around the fuel cell system.

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Abstract

Air flow management and control in a fuel cell gas turbine hybrid power system is evaluated using the Hybrid Performance (Hyper) hardware simulation facility at the National Energy Technology Laboratory (NETL), U.S. Department of Energy. The Hyper facility at NETL is a hardware simulation of a fuel cell gas turbine hybrid power system capable of emulating systems in the range of 300kW to 900kW. The hardware portion is comprised of a modified single-shaft gas turbine, a high performance exhaust gas recuperator, several pressure vessels that represent the volumes and flow impedances of the fuel cell and combustors, and the associated integration piping. The simulation portion consists of a real time fuel cell model that is used to control a natural gas burner which replicates the thermal output of a solid oxide fuel cell. Thermal management in the fuel cell component of the hybrid system, especially during an imposed load transient, is improved through the control of cathode air flow. This can be accomplished in a fuel cell turbine hybrid by diverting air around the fuel cell system. Two methods for air flow control are presented in the paper. In this paper, the use of bleed air by-pass and cold air by-pass are characterized quantitatively in terms of compressor inlet flow, process limits, system efficiency and system performance.

Key findings

  • Cathode air flow control improves thermal management in the fuel cell component during load transients
  • Diverting air around the fuel cell system is an effective method for air flow control
  • The use of bleed air can also be used to control air flow in the system

Keywords

Gas compressorAutomotive engineeringTurbineCombustorHybrid systemSolid oxide fuel cell

Identifiers

DOI
10.1115/pwr2005-50127
Journal
ASME 2005 Power Conference
Year
2004