Abstract
The functions of hot blast stoves are to transfer the waste heat in the exhaust gas from a blast furnace to checker bricks in the center of a hot blast stove, then transfer the heat from the elevated checker bricks to newly input fresh air. After that, the heated fresh air is sent back to the blast furnace to continue the chemical reaction. Heat exchange is performed by the checker bricks and the refractory silica bricks at inner layer of linings. The middle layer of the linings is composed of refractory insulation bricks and outer layer is covered with a steel shell to maintain structural stability. Refractory bricks are brittle materials, and their allowable tensile strength is low. A finite element software ANSYS APDL is used to analyse heat transfer in the multi-layer refractory bricks. The temperature distribution in the refractory bricks in the radial direction are obtained. Thermal stress and strain in the refractory linings are investigated to design the layout of the refractory bricks and the space width between the insulation bricks. The results show that if the gas temperature near the inner surface of the linings is 1250°C, the total thickness of the insulation bricks in the radial direction should be larger than 420 mm to make the surface temperature of the steel shell lower than 120°C. The simulation results can be used as a guideline for the refractory linings design.
Published Version
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