有催化重整反应时热球点燃预混气的理论研究

Analysis of the Ignition of Premixed Gases by a Hot Spherical Surface with Catalytic Reform Reaction

进行了催化性热球和非催化性热球点燃静止 CH4和水蒸气预混气非稳态问题的计算研究 ,并与实验结果对比。热球表面平行地生成 CO、CO2 以及相应的 H2 ;同时空间还存在 CH4、H2 和 CO的氧化反应。实验和计算结果都表明 ,与传统的氧化反应同步发生的催化重整反应所生成的少量 H2 大大降低了着火温度 ,H2

A study of the unsteadiness of the ignition of static premixed gases that contain CH 4 and steam with a catalytic hot sphere and a non catalytic hot sphere was conducted.A comparison between the calculated and experimental results was given in the paper.The catalytic reform reaction of CH 4 with steam on the surface of the sphere produced a small amount of H 2,CO and CO 2,and at the same time there occurred oxidizing reactions of CH 4,H 2 and CO in the space.Both experimental and calculated results show that a small quantity of H 2 produced in the catalytic reform reaction can greatly reduce the ignition temperature.In traditional catalytic combustion precious metals are applied to catalyse the oxidizing reaction between oxygen and fuel to reduce the ignition temperature.Calculations indicate that the high reactivity and high diffusivity of H 2 affect the ignition remarkably.[WT5”HZ]