Heat transfer model analysis of residual thickness of carbon composite brick on the sidewall of blast furnace hearth and thickness of protective layer at hot surface
Since the No.1 blast furnace of Shandong Taishan Iron and Steel Group Co.,Ltd.was put into operation in October 2019,the temperature of the cylinder thermocouple has remained consistently low.To calculate the residual thickness of the carbon composite brick and the thickness of the protective layer at the hot surface,a one-dimensional steady-state heat transfer model was established.The results show that the erosion of carbon composite bricks on the bottom sidewalls of the hearth is low,while the erosion of carbon composite bricks near the center line of the taphole of the hearth is high.Additionally,there is no evidence of"elephant foot"erosion in the hearth area of the blast furnace.The thickness of the protective layer in the blast furnace increases with height.An iron-rich protective layer is easily formed below the center line of the taphole,while a slag-rich protective layer is easily formed above it.The carbon composite brick's main component,alumina,hardly reacts with molten iron,while silica does react with it.The molten iron's critical radius that penetrates the carbon composite brick is 2.030 μm,while is much larger than its average pore size of 0.238 μm.This characteristic helps to resist the erosion of iron.
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