Gas Flow Investigations in a Model of the Imperial Smelting Blast Furnace

摘要

Velocity fields were measured for different types of tuyere arrangement. The flow behaviour can be properly described by using the present model. The investigations of the flow process in the IS-furnacc showed their advantages und disadvantages with regard to the accretion formation. In the present work 7 different positions of the tuyeres were studied: center, asymmetric, horizontal/asymmetric blowing, down bent 10°, down bent 20° and injection of 25% more and 25 % less air volume. On the basis of the above results and discussions, the following conclusion can be drawn: The configuration of the tuyeres has a great influence on the gas flow in the top zone of the furnace. An optimal configuration of tuyeres could not be proposed until now because some dead zones are remaining at the furnace walls, where accretions could form. The tendency for the mean velocity to increase with an increase of air volume is shown. The investigations indicated that the blast tuyere position 10° down bent with an air volume at 25 m~3/h showed the best results. The blast air stays longer in the top zone and doesn't leave the furnace immediately after the injection. A greater effect of the gas mixing with that tuyere position could improve the burning of CO. Based on the measured values a decrease of the accretion formation in the top zone of the furnace can be expected. Due to the results other bent tuyere positions in the model will be studied to further improve the gas flow in the top zone of the furnace.