The homogeneous ignition and volatile combustion of pulverized solid fuel in single-particle and particle group configurations were studied numerically in a laminar flat flame burner. Simulations with increasing particle streams were performed to investigate the influence of the interactions in particle groups on homogeneous ignition and combustion. An extensive set of simulations are conducted considering models with different levels of detail for both the gas-phase and solid fuel chemistry. The reference simulations employ the chemical percolation devolatilization model coupled with a detailed chemistry model for gas-phase reactions. The particle-fluid interactions were modeled with a fully coupled Eulerian-Lagrangian framework. Increased ignition delay times for higher particle streams were successfully validated against available experimental measurements. Furthermore, the transition from single-particle ignition to a conically shaped volatile flame with suppressed reactions near the flame base in particle group combustion was observed in both experiments and simulations. The subsequent detailed investigations revealed that the increased heat transfer to particles and, therefore, lower gas temperature for higher particle number densities together with the local oxygen depletion are the primary reasons for this transition. Based on the reference simulation, different simplified model combinations were assessed. The systematic model reduction investigation started with assessing the fixed volatile composition as a required assumption for flamelet models. Finally, the effects of gas-phase chemistry and different simple devolatilization models on ignition and combustion chemistry were studied. Overall, all model combinations provide reasonable predictions of volatile combustion with minor local deficits in the studied conditions.

在层流扁平火焰燃烧器中对单颗粒和颗粒组构型的粉状固体燃料的均质点火和挥发燃烧进行了数值研究。进行了增加粒子流的模拟，以研究粒子群中的相互作用对均匀点火和燃烧的影响。考虑到气相和固体燃料化学具有不同详细程度的模型，进行了大量模拟。参考模拟采用化学渗透脱挥发分模型以及气相反应的详细化学模型。粒子-流体相互作用采用完全耦合的欧拉-拉格朗日框架进行建模。更高粒子流的点火延迟时间的增加已通过可用的实验测量成功验证。此外，在实验和模拟中都观察到了从单粒子点火到锥形挥发性火焰的转变，在粒子群燃烧中火焰底部附近的反应受到抑制。随后的详细研究表明，对颗粒的热传递增加，因此，较高颗粒数密度的较低气体温度以及局部氧耗竭是这种转变的主要原因。基于参考模拟，评估了不同的简化模型组合。系统模型简化调查首先评估固定的挥发性成分，作为小火焰模型的必要假设。最后，研究了气相化学和不同的简单脱挥发分模型对点火和燃烧化学的影响。总体而言，所有模型组合都提供了对挥发性燃烧的合理预测，在研究条件下具有较小的局部缺陷。