Abstract
Through the examination of blast furnace tuyers failed and replaced by new one, it was found that 43% of the failure occured at upper wall, 45% at lower wall, 12% at side wall and 73% at outer wall of tuyer. The ablated failure occured at the upper and lower part of outer wall and edge wall of tuyer, and the failure of this type exceeded almost 80% of the total failures.
The experimental studies of ablation failure of the blast furnace tuyer were made by the model tuyers of wall thickness 15mm which made from Cu, PBC, BS materials and the cooling water velocity was kept to 3-4m/sec at the inner surface of model tuyers, and molten iron was poured onto the side wall of model tuyers.
On the basis of the experimental ablation data of model tuyers, the heat transfer simulation model of ablation was established, in which the heat transfer coefficients were determined by the results of electronic computer calculations.
By this heat transfer simulation model, the cooling water velocity must be over 13m/sec by the consideration of burn-out data already published by MCADAMS.
Further, an investigation was also made on the effects of thickness of tuyer wall and its thermal conductivity effect on the ablation speed of tuyer.
