Analysis on the improvement of the performance of the ventilation element refractories

In addition to the use of high-temperature molten steel during the use of air-permeable components, thermal spalling caused by furnace cycles, air blowing, and cleaning often causes thermal spalling and fracture, which in turn causes the use of steel to fail. Excellent thermal shock resistance is the key to improving blow-through rate and life.

 

Based on numerical and high-temperature simulation of the use environment of the ventilation element at 1100 ～ 1600 ℃, combined with the flow field simulation of the blowing and stirring effect, the functionally partitioned ceramic core plate combined air channel with the best blowing and stirring efficiency and low thermal stress is optimized. The structure acts as a workspace.

The middle and lower parts do not directly contact the molten steel, and adopt high-temperature diffused and breathable ceramics that act as pre-heated cold gas and safety signs; the body uses spinel castable to ensure the high strength performance of the breathable components.

 

Compared with the traditional integral slit structure, the thermal ventilation stress of the new ventilation element of the functional partitioned composite structure is reduced by 64%. The high temperature simulation test shows that there are no cracks and fractures, and the ceramic core plate has good corrosion resistance, and the synchronous improvement of the material's thermal shock resistance, corrosion resistance and other resistance has been achieved.