Thermal function analysis of cast iron

During severe changes in the heat load (high-temperature air flow or poor furnace conditions), the slag skin may fall off and then bond. The detachment and adhesion of the slag skin can cause significant fluctuations in the thermal load of the furnace wall and its peak value. The design of linings and cooling methods must consider such heat loads to prevent premature burn-in. Detailed studies have shown that the higher the cooling efficiency of the cooling unit, the more stable the slag skin is on the cooler, and the longer it is, the better it is to maintain its isolation and protection. As a result, an efficient cooling system usually brings about the blast furnace. Less heat loss. Burning mechanism of cast iron stave under frequent heat load fluctuations The cooling effect of cast iron staves is worse than that of copper stave because cast iron has lower thermal conductivity than copper, and there is also a thermal insulation coating between steel water cooled tubes and cast body.

This coating can cause a gap between the water-cooled tube and the cast body, resulting in a poor heat exchange effect, which causes the temperature of the hot surface of the cast iron stave to increase (above 70° C.), causing frequent thermal deformation of the cast iron wall (banana shape). At high temperatures, the metallurgical structure and volume of the casting also change, fatigue cracks occur, the wall material falls, and the steel cooling water pipe is directly exposed to the high temperature of the blast furnace. Monel alloy tubes are nickel and copper alloys, containing approximately 62% nickel and 35% copper, tightly integrated with cast copper. It is important to note that the combination of Monel tube and cast copper reduces (or minimizes) the heat exchange loss at the boundary, thus creating a continuous metal bond, thus eliminating all heat transfer obstructions. Any cracks that extend in the cast copper of the soft structure during the furnace do not affect the hard Monel tube.

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