Start-up behavior of a LaMnO3 partially coated monolithic combustor at high pressure
•Ignition of catalytic combustors at high pressure was studied by CFD simulations.•Two configurations (fully and partially coated) were simulated.•Wall thermal conductivity and external heat transfer effects were pointed out.•Fuel ignition occurs for both configurations.•High thermal conductivity and heat transfer are beneficial to reduce ignition duration.
In this work, a CFD model was used to investigate the transient behavior of a perovskite-based monolith during catalytic combustion of methane at high pressure. Two configurations were studied, the configuration of a fully coated monolith and that of a partially coated monolith (with only the external channels coated by the catalyst). Simulations were run at different heat transfer coefficients and wall thermal conductivities. The performance of the partially coated monolith was compared to that of the fully coated monolith. Numerical results have shown that, when setting high thermal conductivity and/or high heat transfer coefficient, the partially coated monolith, which provides complete fuel conversion with much lower catalyst load, can operate at low temperature and low ignition time and with reduced cold-start CH4 emissions.
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Journal: Catalysis Today - Volume 242, Part A, 15 March 2015, Pages 200–210