INVESTIGATION OF THE INFLUENCE OF TEMPERATURE REGIME AND GASEOUS ENVIRONMENT ON THE SERVICEABILITY OF GRATE BARS DURING IRON ORE PELLET ROASTING

Abstract

The article examines the influence of temperature regime and gas composition on the serviceability of grate bars in roasting machines used for iron ore pellet production. It is shown that the operating elements are exposed to significant thermocyclic loads, particularly during short-term machine stoppages, which are accompanied by sharp temperature changes. These conditions lead to accelerated wear of the grate bars and a reduced service life. The study includes an analysis of temperature distribution and concentrations of key gas components (O2, CO, NOx, SO2) along the length of the roasting machine. Critical areas were identified where the combination of temperature fluctuations and an aggressive gaseous environment poses the greatest threat to the integrity of steel components. The article suggests strategies to reduce the negative impact of these factors through the optimization of operating conditions and minimization of unplanned downtime.