提出喷吹煤粉有效热的概念，推导出其计算公式，并选用3种典型的唐钢喷吹煤粉进行计算。计算结果表明：3种煤粉的有效热与煤比呈非线性关系，其有效热值都比通常计算煤粉在回旋区燃烧放出的热量要大。因此，对过去的理论燃烧温度计算公式中煤粉项热量进行了修正。修正结果表明：当煤比小于120 kg/t时，修正前后的理论燃烧温度值几乎一致，但当煤比继续升高，修正后的理论燃烧温度大于修正前，并且其差值越来越大。这可能意味着煤粉大喷吹时，过去理论燃烧温度计算值偏低。

The concept of PCI effect calorific value was presented, and its formula was derived to discuss its relationship with the theoretical combustion temperature and other factors. Three typical PCI in Tangshan Steel were selected for calculation, the result shows that the effective calorific value and PCR are into a non-linear relationship, and the three coals’ effect calorific values are larger than the heat usually considered, which indicates that the pulverized coal heat in theoretical flame temperature formula in the last needs to be corrected. When PCR is less than 120kg/t the theoretical flame temperature before and after revised are almost in consistent with each other, but with the PCR continue to rise, the revised theoretical flame temperature is bigger than the pre-revised and the difference is growing.