China's Refractories

Abstract: To reduce the burning loss and the spalling and to improve energy efficiency, the mullite composite lining plates were used to replace cast steel or alloy lining in rotary coke tanks for coke dry quenching equipment. The results show that: the dense mullite composite lining plate in the cone part has the density of 2.20 g·cm^-3 and the wear test,s volume loss of 4.08 cm³, and the light weight mullite composite lining plate in the straight cylinder part has the density of 1.95 g·cm^-3 and the wear test,s volume loss of 17.6 cm3. After using, there is no shrinkage gap, no burn loss or holes in the plates, indicating good sealing of the mullite composite lining plates. The lining plate for the cone part has low burning loss, without spalling for more than half a year. The outer surface temperature of coke tanks adopting the cast steel or the alloy lining is 480 to 570 ℃, while that of the ones adopting mullite composite lining plates is 120 to 170 ℃, showing a largely improved insulating property. Adopting mullite composite lining plates on the basis of the current coke tank cage, the lining plates can be timely treated and wholly replaced, improving the service life and reducing the maintenance workload.

Key words: coke tank, mullite composite lining plate, coke dry quenching, insulating property