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Energies 2016, 9(6), 421;

The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion

Key Laboratory of Low-Grade Energy Utilization Technologies and Systems of Ministry of Education, Chongqing University, Chongqing 400044, China
College of Power Engineering, Chongqing University, Chongqing 400044, China
Author to whom correspondence should be addressed.
Academic Editors: Antonio Ficarella and Maria Grazia De Giorgi
Received: 23 March 2016 / Revised: 6 May 2016 / Accepted: 15 May 2016 / Published: 30 May 2016
(This article belongs to the Special Issue Combustion and Propulsion)
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The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of protuberances leads to a significant increase of the Arrhenius reaction rate of CH4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular protuberances), the micro-tube reactor with five rectangular protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight protuberances > five rectangular protuberances > five trapezoidal protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular protuberances has the peak efficiency and is therefore recommended for high efficiency reactors. View Full-Text
Keywords: micro-tube reactor; slight protuberances; methane/moist air; catalytic combustion micro-tube reactor; slight protuberances; methane/moist air; catalytic combustion

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Wang, R.; Ran, J.; Du, X.; Niu, J.; Qi, W. The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion. Energies 2016, 9, 421.

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