4.7 Article

Effect of hetero-/homogenous combustion on energy conversion performances and flame stability of methane/air-fueled micro-combustors with heat-recirculating structure and platinum-coated

Journal

FUEL
Volume 349, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2023.128610

Keywords

Catalytic combustion; Hetero-; homogeneous chemistry; Heat recirculation; Thermal performance; Flame stability

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In this study, the joint effect of applying Pt catalyst and heat-recirculating structure on flame stability and thermal performance in methane-air-fueled micro-combustors was numerically investigated. The results showed that these strategies improved the outer wall temperature by 14.4% and extended the blowout limit by a factor of 0.6 compared to a non-catalytic combustor. The intensified heat transfer due to heterogeneous combustion chemistry and heat-recirculating effect contributed to these enhancements. The effectiveness of the heat recirculation structure on combustion performance was more significant than that of the catalytic combustion effect.
In this work, the joint effect of applying Pt catalyst and heat-recirculating structure on the flame stability and thermal performance has been numerically investigated in methane-air-fueled micro-combustors by a detailed three-dimensional computational model. Numerical results indicate that such strategies contribute to improving outer wall temperature by 14.4% and extending the blowout limit by a factor of 0.6 compared to those in the straight non-catalytic combustor. Such enhancements are due to the intensified heat transfer, thus highlighting the contributions of heterogeneous combustion chemistry and heat-recirculating effect. Homogeneous chemistry in the presence of a Pt catalyst is shown to be self-sustained over wide-ranging conditions. Meanwhile, the effectiveness of heat recirculation structure on combustion performance is more significant as compared to that of the catalytic combustion effect, as evidenced by a 4% and 17.6% improvement in the wall mean temperature and blowout limit respectively. Further analysis of the heat recirculation catalytic combustors is conducted to obtain the optimal geometry. There exists a critical flow rate corresponding to the maximum outer wall temperature and radiation energy. In general, this work demonstrates the viability of applying a Pt catalyst and heatrecirculating structure to extend the flame stability limit and energy conversion performance in micro-power systems.

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