The development direction of refractory materials for blast furnace

   Date:2021-03-26     Browse:44    
Core tips:Iron-making blast furnaces are mainly developed in the direction of large-scale. At present, there are 21 blast furnaces
 Iron-making blast furnaces are mainly developed in the direction of large-scale. At present, there are 21 blast furnaces with a volume greater than 4000 m3 in the world, with a maximum furnace capacity of 5,070 m3. Among them, Japan has 15 large blast furnaces. The top pressure of modern blast furnaces is 2~3kg/cm2, the hot air temperature can reach 1200~1300℃, and the air supply pressure is 3~4kg/cm2. At the same time, technical measures such as oxygen-enriched blast and fuel injection are adopted. , The iron output of the blast furnace is increased, and the cost is also reduced.
In 30 years, the maximum volume of Japanese blast furnaces has increased from about 1,000 m3 to more than 5,000 m3, the air supply temperature of hot blast stoves has increased from nearly 430° to over 1200°C, and the air supply pressure has increased from about 0.8 kg/cm to 3 kg. /Cm2 or more. This shows that with the large-scale blast furnace, the smelting intensity has increased, and the operating conditions have become increasingly harsh, and the life of the blast furnace has dropped from about 10 years to 5 to 7 years.
   The structure of the blast furnace hot blast stove has developed from an internal combustion type to an external combustion type or a top combustion type. At present, the most widely used is the external combustion type hot blast stove, that is, the regenerator and the combustion chamber are separated and are respectively arranged in two cylinders. Connect with bridge channel. The top temperature of this kind of hot blast stove is 1500~1560℃, and the average temperature of hot blast is about 1200℃. In this case, the upper part of the checker brick and its wall and dome will work under high temperature conditions for a long time. Therefore, refractory materials with good high temperature creep characteristics and volume stability should be selected.
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