Implementation of convective heating in Companhia Siderúrgica Nacional Blast Furnace runners

This paper describes the main characteristics and advantages of convective heating system for refractory lining, compared with conventional heating systems. In addition the main results obtained are presented with its implementation in CSN Blast Furnace #2 and 3 Runners, in terms of cost and equipment availability, as well as the need for ceramic coating to protect the lining against oxidation, arising from excessive air combustion. ► We describe the main advantages of heating convective system of refractory lining. ► We developed a ceramic coating to protect the refractory lining against oxidation. ► We increase the availability of Blast-furnace Runners and reduce the natural gas consumption.