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首页> 外文期刊>International Journal of Heat and Mass Transfer >High-speed contactless measurements of temperature evolution during ignition and combustion of coal-based fuel pellets
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High-speed contactless measurements of temperature evolution during ignition and combustion of coal-based fuel pellets

机译：煤基燃料颗粒点火和燃烧期间的高速非接触式测量温度演变

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摘要

The temperature evolution of coal pellets, ignited and burned in an initially motionless high-temperature air medium, was analyzed. The fuel pellet surface temperature was recorded using contactless two-color pyrometry with a time increment of 2 ms by means of a high-speed color video camera and an original video frame processing algorithm developed in Wolfram Mathematica. The obtained results made it possible to explore the patterns and characteristics of coal ignition, considering the detected contribution that the gas-phase combustion of released volatiles makes to the pellet heating. The effect of the heating source temperature on the intensity of the fuel surface temperature evolution during the induction period was shown. When the fuel was heated to temperatures above 1073 K, local extrema were identified on the corresponding temperature trend. These characterize the emergence of hot spots - the sites of volatile ignition, preceding the heterogeneous ignition of the solid carbonaceous residue forming as a result of the thermal decomposition of the near-surface layer of the fuel pellet. The time intervals between consecutive local flashes of volatiles in their series from the first recorded occurrence to the last one, corresponding to the moment of the fuel's heterogeneous ignition, reduce five- to sixfold. The uniformity of temperature distribution over the surface of the fuel pellet at the moment of its heterogeneous ignition allows us to determine the moment when the gas-phase spot ignition of volatiles changes to the heterogeneous combustion of the solid carbonaceous residue at heating source temperatures over 1100 K.
机译：分析了煤颗粒的温度演变，在最初的一动不动的高温空气介质中被点燃和燃烧。通过高速彩色摄像机和Wolfram Mathematica开发的原始视频帧处理算法，使用非接触式双色热测定法记录燃料颗粒表面温度。所获得的结果使得考虑到释放挥发物的气相燃烧对颗粒加热的检测到的贡献，可以探讨燃煤点火的图案和特征。示出了加热源温度对诱导期间燃料表面温度演化强度的影响。当将燃料加热至1073k的温度时，鉴定在相应的温度趋势上鉴定出局部极值。这些表征了热点的出现 - 由于燃料颗粒的近表面层的热分解而形成的固体碳质残留物的异质点火之前的挥发性点火。从第一个记录发生的序列中挥发物的连续局部闪烁之间的时间间隔，对应于燃料异构点火的时刻，减少五到六倍。在其异质点火的速度下，燃料颗粒表面上的温度分布的均匀性允许我们确定当挥发物的气相点点火时，挥发物的气相点火变为在加热源温度下的固体碳质残留物的异质燃烧。 K.

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