A pressure drop model of PCI system was developed for Baosteel No. 4 blast furnace based on the additional pressure drop.
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。
The spread range gets smaller because of threshold pressure gradient, and there will be a additional pressure drop in the bottom of the well because of the skin damage.
启动压力梯度使压力波传播范围变小，井底污染会造成一个附加压力降。
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