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 balst furnace was built. This apparatus is 0.90 m3 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 lance 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.
·70 g/Nm3 for injection of the 0% prereduced fine ore mixed with the same amount of pulverized coal.
·175 g/Nm3 for injection of the 60% prereduced fine ore alone.
·115 g/Nm3 for injection of the 60% prereduced fine ore mixed with the same amount of pulverized coal.
