本文用数值模拟的方法对大型电站锅炉然烧室进行了三维全模拟计算，给出了数学模型和解法，并把计算值和实测值进行了对比。在全面预报燃烧室性能的基础上，对四角切圆燃烧锅炉炉膛出口存在的左右温度和速度偏差问题进行了探讨。 In this paper, a three-dimensional full simulation of the natural combustion chamber of a large power station boiler is carried out by numerical simulation. The mathematical model and solution method are given, and the calculated and measured values ​​are compared. On the basis of comprehensively forecasting the performance of the combustion chamber, the problems about the left and right temperature and speed deviation existing in the furnace exit of the tangentially fired boiler were discussed.