Simultaneous imaging of polycyclic aromatic hydrocarbons (PAHs), soot, and the flame zone formed around a single coal particle was conducted to investigate the flame structure of a single coal particle. The spatial distribution of PAHs, soot, and the flame zone was illuminated using PAHs and CH\(\mathrm {_2}\)O laser-induced fluorescence (LIF) and laser-induced incandescence (LII), respectively. Additionally, the spatial distribution of the primary soot particle size was evaluated using a combination of LII and laser-induced scattering (LIS). The results showed that the CH\(\mathrm {_2}\)O-LIF imaging was successful for the volatile flame of a single pulverized coal particle. The PAHs-LIF signal was found inside the region where the LII signal was measured, while the CH\(\mathrm {_2}\)O-LIF signal was detected outside of the LII signal. The size of soot particles increased, and the soot number density decreased from the interior to the exterior of the volatile flame. Furthermore, the structure of the volatile flame of a single coal particle was found to be identical to that of a diffusion flame.

对多环芳烃（PAH）、烟灰和单个煤颗粒周围形成的火焰区域进行同步成像，以研究单个煤颗粒的火焰结构。分别使用 PAH 和 CH \(\mathrm {_2}\) O 激光诱导荧光 (LIF) 和激光诱导白炽光 (LII) 照明 PAH、烟灰和火焰区域的空间分布。此外，还结合 LII 和激光诱导散射 (LIS) 评估了初级烟灰颗粒尺寸的空间分布。结果表明，CH \(\mathrm {_2}\) O-LIF 对单个煤粉颗粒的挥发火焰成像成功。PAHs-LIF 信号位于测量 LII 信号的区域内，而 CH\(\mathrm {_2}\)在 LII 信号之外检测到 O-LIF 信号。从挥发火焰内部到外部，烟尘颗粒尺寸逐渐增大，烟尘数密度逐渐减小。此外，发现单个煤颗粒的挥发火焰的结构与扩散火焰的结构相同。