用单颗粒模型研究了煤焦燃烧时焦碳氮转变成 NO的过程。模型中考虑了炭粒内部和外部温度和组分浓度的变化 ,在源项的处理上采用了简单的化学反应动力学机理模型。应用有限差分法对温度和组分浓度方程进行了离散化 ,并用 Gauss- Seidel迭代法对所得到的离散方程求解。计算结果表明 ,颗粒粒径、环境 NO和 O2 浓度对焦碳燃烧过程中 NO形成及还原都有重要的影响。 The single particle model was used to study the process of coke nitrogen transformation into NO during combustion of coal char. The model takes into account changes in temperature and component concentration inside and outside the char and uses a simple chemical reaction kinetic mechanism model for the source term. The temperature and component concentration equations were discretized using the finite difference method, and the resulting discrete equation was solved using the Gauss-Seidel iteration method. The calculated results show that the particle size, NO and O2 concentrations have an important effect on the formation and reduction of NO during the combustion of coke.