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为了研究微尺度催化燃烧可燃极限的变化规律,使用计算流体软件FLUENT和化学动力学软件DETCHEM对甲烷空气预混气体在微通道内催化燃烧进行了数值模拟。计算结果表明,微通道的导热壁对火焰的稳定性有重要的影响。较低的流速造成燃气在微通道内停留的时间过长,大量的热量通过导热壁散失到环境中导致熄火;较高的流速使燃烧区域往下游移动,导致吹熄。熄火特征与导热壁面温度以及铂和氧的表面覆盖率之比有关。
In order to study the variation law of combustibility limit of micro-scale catalytic combustion, numerical simulation of catalytic combustion of methane-air premixed gas in microchannels was performed by using FLUENT software and DETCHEM software. The calculation results show that the microchannel thermal wall has an important influence on the flame stability. The lower flow rate causes the gas to stay in the microchannel for too long and a large amount of heat dissipates into the environment through the heat-conducting walls, resulting in flameout. Higher flow rates cause the combustion area to move downstream, resulting in blown-out. The flameout characteristics are related to the thermal wall temperature and the ratio of surface coverage of platinum and oxygen.