Blast furnace ironmaking hot blast furnace is an important core kiln in the ironmaking process, and high alumina refractory bricks are widely used in hot blast furnaces as a basic product in refractory materials. Due to the extreme temperature difference between the upper and lower sides of the hot blast stove, the refractory materials used in each section vary greatly. The parts where high alumina bricks are applied mainly include the vault area of the hot blast stove, the large wall, the regenerator, and the combustion chamber. details as follows:
The vault is the space connecting the combustion chamber and the regenerator, including the working layer bricks, the filler layer and the thermal insulation layer. Because the temperature in the vault area of the hot blast stove is very high, exceeding 1400 ℃, the high alumina bricks used in the working layer are low creep high alumina bricks, and silica bricks, mullite bricks, sillimanite, and andalusite can also be used in this part. Brick;
The large wall of the hot blast stove refers to the wall part of the hot blast stove body, including the working layer brick, the filling material layer and the heat insulation layer. The working layer bricks choose different refractory bricks according to the upper and lower temperatures, and the high alumina bricks are mainly used in the middle and lower parts.
The regenerator is a space filled with checkered bricks, and its main function is to use the checkered bricks inside to exchange heat with high-temperature flue gas and combustion-supporting air. In this part, low-creep high-alumina bricks are used, mainly in the middle position.
The combustion chamber is the space where the gas burns. The setting of the combustion chamber space has a great relationship with the furnace type and structure of the hot blast stove. High alumina bricks are often used in this part. Low creep high alumina bricks are used in high temperature areas, and ordinary high alumina bricks can be used in medium and low temperature areas.