Maximum Injection Rate of Fine Ore into Blast Furnace through Tuyeres.

Abstract

In order to obtain the maximum fine ore injection rate, an experimental apparatus capable of simulating the heat transfer and reaction in the lower part of the blast furnace was built. This apparatus is 0.90m3 in inner volume, is a 90° sector in cross-section, is one-fifth of the actual blast furnace in height and is equipped with one tuyere.As a result of the fine ore injection through the burner which was inserted through the blow pipe, the maximum fine ore injection rates at which the desired deadman temperature can be maintained were experimentally determined as shown below. The maximum fine ore injection rate in the actual blast furnace is expected to be higher than those measured here.• The injection of the 0% prereduced fine ore alone is difficult.• About 70g/Nm3 for injection of the 0% prereduced fine ore mixed with the same amount of pulverized coal.• 175g/Nm3 for injection of the 60% prereduced fine ore alone.• About 115g/Nm3 for injection of the 60% prereduced fine ore mixed with the same amount of pulverized coal.