Study on Catalytic Combustion Characteristics of Hydrogen inside Micro Scaled Tube

Abstract

Catalytic combustion of hydrogen/air mixture inside micro-tube was numerically investigated with detailed gas phase and surface catalytic chemical reaction mechanisms. Combustion characteristics for different reaction models, inlet velocity, tube diameter on surface catalytic combustion reaction, and comparison of numerical and experimental studies were discussed. The Computational results indicate that the surface catalytic combustion restrains the gas phase combustion. The effect of the surface catalytic reaction on the gas phase reaction can be divided to three types. The existence of catalytic wall will help to reach complete reaction in the micro-tube. Some theoretical evidences are provided for the application of catalytic combustion to Micro-electromechanical System (MEMS) and the extension of the combustion limits.

Experimental study on premixed methane-air catalytic combustion in rectangular micro channel

“…Including the use of special structure design by Wan J et al [10], Jiaqiang E et al [11], and Yang W M et al [12][13], adding porous media in the combustion chamber by Pan J F [14] and Yang W M et al [15], and using bluff body to improve the stability of combustion by Bagheri G et al [16]. Besides, catalytic combustion is also an effective and simple method to guarantee stable combustion [17][18][19][20]. The reason lies in that, the reduction in the size of combustor will result in insufficient and unstable combustion.…”