煤焦燃烧NO释放规律研究

Study on NO Release from a Char Combustion

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 conversion of Char N to NO during the char combustion was studied with a single particle model.The variance of temperature and species concentrations within and around the particle in the model has considered.Sources of the equations were calculated by using chemical reaction mechanism.The Finite Difference Method was used to discretize the temperature and species concentration equations.The Gauss Seidel Iterations Method was used to solve the discretization equations within and around the particle.Results of the calculations determined the particle diameter,environmental NO and O 2 concentrations around the particle have important effect to the release of NO.