Induction Furnace Lining Thickness

Induction furnace lining is a relatively important component of medium-frequency furnaces. The induction furnace lining thickness has a significant impact on its effectiveness and quality of furnace lining, so what are the requirements for the thickness of induction furnace lining? What factors will affect the thickness of the intermediate frequency furnace?

1. Requirements for Induction Furnace Lining Thickness

The thickness of the furnace bottom of the medium frequency furnace lining is about 280 mm, and sand filling is performed four times respectively. When manual tying is performed, it is necessary to prevent uneven density at various places, and the furnace lining is not dense after baking and sintering. Therefore, it is necessary to strictly control the feeding thickness, with each sand filling thickness not greater than 100mm, and the furnace wall thickness controlled within 60mm. Try to implement multi-person shift operations to avoid uneven density.

When tying the furnace wall, the thickness of the furnace lining is about 110-120mm. Add dry binding material to it in batches, with a filler thickness of no more than 60mm, and tie for 15 minutes until it is flush with the induction coil.

During the normal use of the furnace lining, the thickness of the furnace lining will gradually become thinner due to the continuous erosion of molten iron. A more intuitive manifestation is the increase in the content of the furnace. Generally, after the furnace lining is eroded by 30% to 50%, it is necessary to knock it off again and build a new intermediate-frequency furnace.

2. Factors Affecting the Induction Furnace Lining Thickness

(1) Chemical erosion

The chemical attack refers to the reaction of newly added furnace charges and alloys with the materials in the furnace lining during the production process, resulting in erosion of the furnace lining materials. In sintering furnace lining, it is necessary to pay attention to the C, Si ratio of the molten iron component to the furnace lining component, and the same considerations should be taken into account during the production process. For example, in production, if a carburetor is added too early to supplement the C component in molten iron, it will cause the C content in the molten iron to be too high. At this time, in order to balance, Si is added, which in turn will cause the furnace lining to absorb a large amount of Si, resulting in premature erosion of the slope.

(2) Mechanical erosion

Mechanical erosion is generally related to the operation of personnel. Usually, during dissolution, there is a phenomenon of bridging the furnace charge, which means that molten iron has been dissolved from the slope at the bottom of the furnace, but the charge above is still in the middle of the electric furnace without contacting the molten iron. This situation is usually not directly visible, so the input power has not decreased, which leads to an increase in the temperature of the furnace bottom above 1600 degrees Celsius, which will accelerate the erosion rate of the furnace lining. The higher the temperature, the faster the erosion rate. When the temperature of molten iron continuously rises to a larger temperature, the furnace lining will not be able to withstand the phenomenon of overheating the sintering layer of the furnace lining material, and the overheated furnace lining material is more likely to be washed away.

The above is a complete introduction to the requirements and influencing factors of the induction furnace lining thickness. There are also certain requirements for the thickness of the furnace lining during the use of the induction furnace. It is also necessary to pay attention to various reasons that affect the thickness of the furnace lining during the use process to avoid causing losses.

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