A three-dimensional numerical simulation was performed to investigate the physics and combustion characteristics of a two-phase reacting turbulent flow in a pilot-scale pulverized coal combustion furnace. This included an elementary reaction mechanism using an extended flamelet/progress variable (EFPV) method. The simulation was validated via comparison with an experiment in terms of the gaseous temperature and distribution of the gas mole fraction. The EFPV method predicted the flame structure and combustion characteristics of the pulverized coal. In the main reaction zone where the released gas combustion was dominant, two separate combustion regions were observed, and they were attributed to hydrocarbons and CO combustion. Gas flow characteristics such as mixing of low temperature gas and hot burnt gas were well described in the inner recirculation zone. The CO₂ conversion reaction to CO occurred slowly and decreased the gaseous temperature beyond the main reaction zone in the low and zero oxygen environments. The simulation predicted the unburned CO combustion correctly beyond the flame when staged air was injected; however, the combustion rate was overestimated due to the fundamental assumption of the EFPV method, attributable to the limitations of the steady state flamelet approach.

进行了三维数值模拟，以研究中试规模粉煤燃烧炉中两相反应湍流的物理特性和燃烧特性。这包括使用扩展小火焰/进展变量（EFPV）方法的基本反应机理。通过与实验比较，在气体温度和气体摩尔分数的分布方面验证了该模拟。EFPV方法可预测煤粉的火焰结构和燃烧特性。在释放气体燃烧占主导的主反应区中，观察到两个单独的燃烧区域，它们归因于碳氢化合物和一氧化碳燃烧。在内循环区中很好地描述了诸如低温气体和热燃烧气体的混合之类的气体流动特性。一氧化碳在低氧和零氧环境中，向CO _2的转化反应缓慢发生，并使气态温度降低至超出主要反应区的范围。该模拟预测，当注入分段空气时，未燃烧的CO燃烧将正确地超出火焰。但是，由于稳态小火焰方法的局限性，由于EFPV方法的基本假设，燃烧率被高估了。