The blast furnace components affect the performance of blast furnace production
(1) the hearth. On the hearth, middle and bottom tuyere, slag and iron mouth mouth, there are more than two iron mouth in large blast furnace without slag on the mouth. Upper part of the hearth tuyere zone is where the fuel combustion, is the birthplace of the gas source of calories and refining process. Hearth bottom is also called the hearth, is slag iron storage area, for the slag iron reaction, is an important link to ensure the quality of cast iron. So the hearth is has a decisive position on blast furnace production.
(2) the bosh. Bosh is inverted frustum of a cone, the contraction to adapt to changes in the volume of ore after the drop, but also make the burning zone of high temperature gas away from the wall, is conducive to the formation of slag skin, extend the service life of blast furnace. Slag skin is the best lining in the process of blast furnace production, copper cooling stave can form solid slag skin quickly, so don't have to use expensive in areas such as the furnace body of silicon carbide quality high-grade refractory, masonry and a thin layer (such as 100 ~ 120 mm) of common refractory material or coating thickness corresponding not stereotypes refractories.
(3) the furnace waist. Bosh is one of the biggest diameter of blast furnace, its diameter determines the size of the blast furnace in high ratio relationship. Its height not decisive, belong to the transition section of blast furnace. After using the production practice shows that copper cooling stave, furnace the heat loss is reduced, rather than wallow in misery as copper coefficient of thermal conductivity is big, will take a lot of heat and increase the heat loss.
(4) shaft. Shaft is a frustum of a cone, furnace charge in the furnace body preheating and prereduction, shaft diameter from top to bottom gradually expanded to accommodate thermal expansion in the charge and to reduce the friction between the furnace wall, and the burden of shaft Angle size have obvious effects on blanking, but also has effect on the shaft height on gas utilization. It is only in blast furnace oxidation reaction zone, the high temperature can reach 1900 ~ 2400), high temperature and thermal stress caused by damage to brick lining, and high temperature gas scour, iron slag erosion, alkali metal erosion and scouring circular motion of coke, and so on. Modern blast furnace adopts the combination of brick masonry hearth tuyere area, materials for high alumina, corundum mullite and corundum and silicon nitride combined with silicon carbide, etc., also useful compression carbon block.
(5) the throat. Throat is the burden in blast furnace entrance, also is the guide of export gas, to control and adjust the effect to the furnace charge and gas distribution.