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Function and principle of holding furnace
There are many kinds of holding furnaces, such as coke oven, gas oven, resistance furnace, and induction furnace. However, resistance heating furnace is widely used, followed by electric reverberatory furnace. This furnace has the advantages of simple structure, convenient temperature control and good working conditions. The heat preservation capacity of the furnace can only make up for the total heat loss. In order to improve production efficiency or ensure continuous production, generally large furnace groups are equipped with holding furnaces. Generally, melting furnace is used to melt raw materials. After the chemical composition is adjusted to be qualified, the melt is transferred to the holding furnace. The power design of holding furnace is lower than that of melting furnace. As the name implies, the main function of the holding furnace is to keep the melt temperature within the range of casting temperature and ensure the stability of continuous or semi-continuous casting production process.
Holding furnace is also called "static furnace" because it objectively has the function of static degassing and homogenization.
According to different brands and specifications of main products, there is a certain matching relationship between the capacity of holding furnace and melting furnace. In some continuous casting production, two melting furnaces correspond to one holding furnace.
The holding furnace is actually the continuation of the igniter. Some holding furnaces are not equipped with burners, but only a cover, which can prevent the heat from the material surface from radiating into the atmosphere, keep high temperature of the material surface for a period of time, and reduce the quenching effect. Some holding furnaces are equipped with burners to heat the material surface to strengthen the mineralization effect of surface sinter, improve the yield of surface sinter, and reduce the amount of return ore.
When the burner is installed in the holding furnace, the higher temperature in the furnace is 800-900 ℃; when the burner is not installed, the temperature in the furnace is 250-350 ℃. The former surface sinter FeO is increased by 1% - 2% on average, the drum index is increased by 2% - 3%, but the ignition heat consumption is increased by 12% - 18%. The production practice of many sintering plants has also proved that if the sintered material layer is thicker than 700 Ram and has a complete classification system, heating in the holding furnace can improve the strength of surface sinter. It is of little significance to reduce the return rate.
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