The development of lean-premixed catalytic reactors for ultra-low emissions combustors in gas turbines presents many design and operability challenges that are not addressed with conventional steady-state reactor models with one-step chemistry mechanisms. These challenges include transient light-off from low temperatures, catalyst deactivation, and hysteresis in catalytic activity. To address these issues, a transient 1-D reactor model with a validated multi-step surface chemistry mechanism has been developed to explore such behavior in catalytic combustors. The surface chemistry sub-model has been incorporated for investigating lean catalytic combustion of CH4 on Pd-based catalysts. The current study investigated the effects of operating conditions — such as pressure, inlet temperature, and velocity — on catalytic reactor ignition and deactivation. The transient modeling provides curves for reactor light-off for a range of inlet pressures and velocities and reveals conditions wherein Pd-catalyst undergoes reduction/deactivation. Model results are compared with some experimental measurements and implications for catalytic combustor design and operation for gas turbine applications are discussed.
- International Gas Turbine Institute
Transient Modeling for Assessing Catalytic Combustor Performance in Small Gas Turbine Applications
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Zhu, H, & Jackson, GS. "Transient Modeling for Assessing Catalytic Combustor Performance in Small Gas Turbine Applications." Proceedings of the ASME Turbo Expo 2001: Power for Land, Sea, and Air. Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations. New Orleans, Louisiana, USA. June 4–7, 2001. V002T02A063. ASME. https://doi.org/10.1115/2001-GT-0520
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