以附加压降法为基础，对整套宝钢4号高炉喷煤系统的压降作了模型计算。分别对水平管、上升管、以及不同曲率半径的弯管等建立了相应的固相摩擦因数经验式，得到了一整套计算喷吹管路压降的模型。与生产装置的运行结果相比，该模型的预测精度较好。这一模型的建立不仅对高炉喷煤系统的设计计算提供了有效的参考，而且还对现有的宝钢4号高炉喷煤系统的节能降耗给予了一定的理论支持。

A pressure drop model of PCI system was developed for Baosteel No.4 blast furnace based on the additional pressure drop.The empirical expressions of solid phase friction coefficient for horizontal pipe, rising pipe and bends with different radius of curvature were established. The predicted pressure drop was in good agreement with the production data. The model provides not only effective reference for designing blast furnace PCI system but also theoretical support for energy saving on Baosteel No.4 blast furnace system.