This paper reports results of experimental and numerical studies of NOx formation in a 30 kW_th lab-scale bubbling fluidized bed running in oxy-fuel mode. The numerical model is based on the GRI-mech 3.0 mechanism to compute the kinetics of homogeneous reactions of volatiles and char combustion products and takes into account the flue gas recirculation. The impact of the oxygen excess and of the fluidized bed temperature was examined. Both the numerical simulations and the experiments shown a significant correlation of NO_X formation with the excess of oxygen, where a higher oxygen concentration enhances the fuel-bound nitrogen oxidation to NO_X. It was also found that there is no correlation of the NOx formation and resulting emissions with the fluidized bed temperature in temperature range typical for bubbling fluidized bed combustors (840–960 °C), but the numerical simulations showed an increased NO_X concentration when the temperature raised more (up to 1360 °C). The agreement of experimental and numerical results shows that the numerical model can provide useful insight into the mechanism of NO_X formation.

的NOx的形成实验和数值研究本文报道的结果在一个30千瓦_个实验室规模的鼓泡流化床中氧-燃料模式下运行。该数值模型基于GRI-mech 3.0机理来计算挥发物和焦炭燃烧产物的均相反应动力学，并考虑了烟气再循环。检查了氧气过量和流化床温度的影响。数值模拟和实验均表明，NO _X的形成与氧气过量之间存在显着的相关性，其中较高的氧气浓度增强了燃料结合的氮氧化为NO _{X的能力。}。还发现存在与产生的排放的NOx形成的无相关性随着温度的流化床温度范围典型为鼓泡流化床燃烧器（840-960℃），但数值模拟显示增加NO _X浓度的时温度升高更多（最高1360°C）。实验和数值结果的吻合表明，该数值模型可以为深入了解NO _X的形成机理提供有用的见识。