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Performance comparison of condensing furnace lining and holding furnace lining of submerged arc furnace
Dec 26, 2018

In the ferroalloy smelting ore furnace, the traditional lining is mainly composed of heat preservation. However, in recent years, the newly developed condensing furnace lining adopts refractory material with high heat conduction performance and water-cooled furnace wall. This new furnace lining transfers heat through the lining. The lining is cooled and is below the melting point of its own material. A layer of protective slag shell is wrapped around the refractory material. In turn, the refractory material is protected to reduce the damage of the lining by erosion, erosion and thermal shock, and prolong the service life of the lining.

The submerged arc furnace with condensing furnace lining has less heat loss than the traditional lining, but the heat loss at the bottom of the furnace is large. The reason for the analysis may be related to the arrangement of the electrodes, which may be caused by the polar circle factor. Further research is needed. .

The success of the condensing furnace lining depends on a stable cooling layer. The lining material has good thermal conductivity, small temperature gradient, and low temperature throughout the furnace wall. The slag phase is inside the furnace wall, and the slag phase encounters a low temperature, and the condensation is solid. At this time, although the temperature gradient at the inner wall is large, the slag shell plays a protective role. When the dynamic balance inside and outside the furnace wall is reached, the thickness of the slag shell is also constant, so the furnace wall theoretically has an infinitely extended life. That is, as long as the heat dissipation conditions are sufficient and the furnace wall is kept at a low temperature, regardless of the high temperature in the furnace, the inner wall of the lining always has a slag phase to form a protective furnace wall.

Compared with the traditional lining, there are several advantages:

(1) Under the same conventional power density, the traditional adiabatic insulation furnace lining has sufficient insulation conditions, the thermal conductivity is small, and the temperature gradient is large; while the new cooling furnace lining has large thermal conductivity, fast heat dissipation, small temperature gradient on the outer wall of the lining, and large gradient of the inner wall. Therefore, when the dynamic balance is reached, the heat loss of the two linings may actually differ little.

(2) If the traditional insulation furnace lining is limited by material properties at high power density, it will be gradually thinned by high temperature and some metallurgical reaction erosion and melting, and the cooling furnace lining has good thermal conductivity and external cooling effect, even in the furnace. The power density is 髙, but due to the large temperature gradient on the inner wall surface, there is always a slag lining to form, which has self-protection effect, and the advantages are obvious.

(3) If the power density is different, there is no comparability, and it is impossible to determine which lining consumes more power.

to sum up 

As can be seen from the above, the use of a condensing furnace lining has a great advantage over the conventional holding lining, especially in the service life of the submerged arc furnace. The condensing furnace lining is theoretically infinitely long-lived, which is more obvious first.

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