When the hot blast stove is working, the insulation ceramic fiber board lining is affected by the rapid temperature change during the heat exchange process, the chemical erosion of the dust brought by the blast furnace gas, the mechanical load, and the scour of the combustion gas, etc. The main causes of damage to the lining of the hot blast stove are:
Effect of thermal stress. When the hot blast stove is heating, the temperature of the combustion chamber is very high, and the temperature of the top of the furnace can reach 1500-1560 ° C. From the top of the furnace along the furnace wall and the checker bricks to the down side, the temperature gradually decreases; When blowing air, high-speed cold air blows in from the bottom of the regenerator and is gradually heated. Due to the continuous heating and air supply of the hot blast stove, the lining of the hot blast stove and the checker bricks are often in the process of rapid cooling and rapid heating, and the masonry will crack and peel off.
(2) Chemical attack. The gas and combustion-supporting air contain a certain amount of basic oxides, and the ash after combustion contains 20% iron oxide, 20% zinc oxide and 10% basic oxides, and most of these substances are expelled out the furnace , but a small number of components adhere to the surface of the gun body and penetrate into the body of the gun brick. Over time, it will lead to damage to furnace lining insulation ceramic fiber board etc, and lead to shedding, and reducing strength of furnace lining..
Next isse we will continue to introduce causes of damage to the ceramic fiber board of hot blast stove lining. Please stay tuned!
Post time: May-22-2023
