煤粉及碳氢燃料火焰富氧与空气燃烧相比，化学反应和热辐射有较大区别，因此影响火焰结构及温度分布，从而影响碳黑（Soot）的生成转化行为。本项目拟采用数值模拟与实验室试验揭示O2/CO2气氛下碳烟颗粒物的形成机制。对煤粉挥发份中含量较大的碳氢混合物详细化学反应机理，建立适用于CO2 气氛的模型并发展简化模型，基于简化模型模拟研究扩散火焰中碳烟颗粒群尺度分布、表面积、分形维数、形貌特性、组分浓度等多个特征量的动力学演变过程，并采用光学检测结合先进的热泳取样与电镜扫描法探寻火焰温度、热流及碳黑浓度分布、微观结构及驻留时间等关键参数，阐明化学反应、火焰结构及热辐射对碳黑生成产生影响的根本原因；进一步，基于简化模型，耦合简单双方程烟黑模型，模拟煤粉火焰中与挥发份反应耦合的碳黑成核、生长和氧化，并求解煤焦油、烟黑质量分数和颗粒数密度输运方程。本研究对降低燃烧污染物排放具有重要科学意义和应用价值。

The soot formation of oxyfuel combustion is quite different compared with air combustion in pulverized coal and hydrocarbon fuel flames due to the difference of thermal radiation and chemical reaction. This project uses a combined theoretical modeling simulation and experimental investigation to explore the soot formation in O2/CO2 atmosphere. The chemical reaction model in CO2 atmosphere is established for the main hydrocarbon mixture of pulverized coal volatile. Based on this full updating mechanism mechanism, the reduced mechanism of semi-empirical model of soot is developed. The dynamics evolution of soot particles size distribution, surface area, fractal dimension, morphology characteristics, species concentration and other characteristic quantities in-depth study is conducted in CO2 atmosphere for diffusion flame. The optical measurement, advanced thermophoretic sampling and electron microscopy scanning methods are used to explore the key parameters such as flame temperature, radiation heat flux distribution, carbon black concentration distribution, microscopic structure and dwell time of soot, and clarify the root causes of influence of chemical reaction, the flame structure and thermal radiation on the soot generating. Further, the simplified model and the simple two-equation soot model are coupled to simulate the nucleation, growth and oxidation of soot, and solving the coal tar, soot volume fraction and particle number density transport equation. The study has important scientific significance and application value for reducing pollutant emissions of combustion.