水素-空気予混合気の流路内触媒燃焼に関する素反応機構による数値解析(熱工学,内燃機関,動力など)

概要

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A catalytic combustion has remarkable advantages of the low temperature combustion without NO_x emission and the fuel-lean or fuel-rich combustion beyond flammability limit. Recently, the catalytic combustion is applied to treat the purge gas including hydrogen from fuel cell equipment, because hydrogen gas is very dangerous when it is accumulated in the enclosed space. The measurement of the physical quantity in the honeycomb, which is commonly used for catalytic combustion, is very difficult, because it is assembled with a lot of millimeter-sized channels. So, it is necessary to investigate by the numerical simulation and to understand the phenomenon in the honeycomb. We have carried out the numerical study on the catalytic combustion of platinum catalyst in a channel using detailed chemical kinetics for hydrogen-air combustion and platinum catalytic surface. Then, the details of catalytic combustion in a channel, such as temperature, mass fraction in the gas phase, surface temperature, surface coverage and reaction rate of the elementary reaction, have been obtained. Especially, the effects of fuel equivalence ratio, water vapor contained in hydrogen-air mixture and surface roughness have been estimated and the catalytic reaction mechanism have become clear.
一般社団法人日本機械学会の論文
2007-11-25