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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.