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对高温复杂介质微纳米尺度含碳固体颗粒成分进行快速检测研究。以高纯氢气火焰中淮南烟煤未完全燃烧为例,采用高能脉冲激光束照射火焰中的碳粒子,提出多段式指数函数拟合不同尺度受热粒子激光诱导辐射光谱时域混合信号的方法,同时结合Kn数判断受热粒子所处的流动区域,确定燃煤氢气火焰中初始碳烟、成熟碳烟以及焦炭或未燃尽煤粒的平均粒径分别为7,25,3×103 nm。并根据不同火焰高度含碳颗粒成分的粒径与相对浓度变化,探索煤粉燃烧过程中微纳米尺度碳粒组分的演变特性。为高温复杂介质中超细颗粒物尺寸分布提供了一种快速、有效的检测手段。
Rapid Detection of Micro-Nano-Scale Carbonaceous Solid Particles at High Temperatures in Complex Media. Taking incomplete combustion of Huainan bituminous coal in high purity hydrogen flame as an example, a high-energy pulsed laser beam was used to irradiate the carbon particles in the flame and a multi-step exponential function was proposed to fit the time-domain mixed signal of laser radiation spectrum induced by heated particles of different scales. Kn number to determine the flow of heated particles in the region to determine the initial coal-fired hydrogen flame carbon soot, mature soot and coke or unburned coal particle average particle size of 7,25,3 × 103 nm. According to the variation of particle size and relative concentration of carbonaceous particles with different flame height, the evolution characteristics of micro-nano scale carbon components in coal combustion process were explored. It provides a fast and effective detection method for the size distribution of ultrafine particles in high temperature complex media.