The main trench of the blast furnace serves as a channel for transporting molten iron and slag during the ironmaking process,and the refractory material of the main trench is corroded by slag and iron.With the increase of iron flow and the tem-perature drop of the iron tapping interval in the blast furnace,cracks and peeling occur in the upper part of the iron storage main trench.The temperature within a distance of 4 mm～50 mm from the heating surface is 1100℃.The refractory material gradually sinter and shrinks from the working surface,while the back part remains unsintered with minimal volume change.Tensile stress occurs at the interface between the sintered layer and the unsintered layer,causing parallel cracks to appear on the working surface.The repeated heating and cooling of the main trench causes crack propagation,erosion by slag,and peel-ing of refractory materials,resulting in thinning of the refractory materials in the working layer of the blast furnace main trench.How to ensure the safe and stable operation of the main channel online and extend its service life is worth further research and exploration by ironworkers.
维普
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