Blast furnace runners
Over the past decades the performance of blast furnaces has gradually increased. This development has had a massive impact on the profile of requirements placed on the refractory linings of runner systems.
RHI’s installation concepts for blast furnace runner systems are based on state-of-the-art technical standards, taking into consideration individual customer wishes and requirements.
The RHI product program is optimally keyed to the two main functions, the separation of pig iron from slag and its transport to the subsequent transport vessels or other facilities.
The operation parameters of the blast furnace (performance, size, metallurgy, tapping practice, etc.), as well the different stresses on the refractory linings caused by pig iron and slag, lead to a product program which is optimally suited to the different customers’ operating parameters.
Each part of the runner is exposed to different stress factors, which influence the selection of the right refractory products.
Blast furnace runner wear mechanisms and lining concepts
The main wear areas in the main runner are located in the impact area, the slag zone and the transition zone between slag and hot metal. Depending on the geometry of the runner and the flow rates of pig iron and slag, the hot metal and slag discharge areas as well as the lower edge of the skimmer block show premature wear. The geometry and slope of the runners and chemical attack are the decisive wear factors in the secondary runners (hot metal and slag runner) as well.
Today the state of the art is to use ULC (Ultra low cement) – castables based on Al2O3 – SiC – C – for wear lining. RHI offers a wide variety of standard products in different qualities. In some cases products are also tailored to specific customer requirements.