因微型燃烧器内微尺度燃烧易熄火,燃烧效率不高,存在催化重整过程中的积碳、微尺度等问题,可利用甲烷和湿空气中水蒸汽预混催化重整产氢来强化燃烧,对预混腔内催化重整,积碳及流动特性进行模拟,探讨了微型预混腔中甲烷、水蒸汽重整过程中水碳比、质量流量和催化壁面温度对催化重整、积碳、流动等的影响.

Generally,combustion of methane in micro chamber has some problems such as low efficiency and non-steady.In it has been proposed that the steady combustion in micro-scale could be achieved with catalyst method.The influence of molar ratio of CH4/air and catalytic temperature for combustion in annular micro-chamber have been studied when Pt was used as catalyst.The results suggest that these factors have important influences on the combustion of CH4/air mixture in annular micro-chamber,and the steady of combustion can be improved via catalysis approach.The ideal molar ratio of methane/air for combustion is obtained as 0.8～1.0.Catalytic temperature playsa key role on the combustion of methane in micro chamber.The higher temperature can accelerate catalytic combustion of CH4/air mixture as the molar ratio of CH4 is small.When flow rate of methane is 6.5 g/h,the maximal conversion efficiency of methane is 77%.

In order to improve the combustion property in the micro combustor,the problems in the micro combustor are analyzed and the relevant measures are put forward. Based on the characteristic of MEMS technology and micro combustors,the structure of the micro combustor is ameliorated by the methods of rotational flow,adding premixing channels and export channels and predigesting devices for pipe connection.The results show the premix time(efficiency) of fuel and air is enhanced in the premixed chamber.It can make full use of the gas heat and increase the initial temperature of premix gas and reduce heat emission of the micro combustor,which is be favorable for the fire of fuel.The burning time of fuel and air is prolonged and gas disturbance is intensified in the combustion chamber. The device connecting pipes of the micro combustor and gas sources is designed,which predigests the connect problems of pipes and is convenient for the installation of pipes and is easier to ensure gas tight.This research will lay the foundation for the next experimental investigation about premix、catalytic reforming and combustion of fuel and air in the micro combustor.