Kingfisher resolves wear-liner problems at coal-fired power station
29 Nov 2010
Kingfisher Industrial has provided a ceramic wear-protection liner to a coal-fired power station, to replace two alternative systems that had failed.
Kingfisher was called in by the plant engineer at the power station following unsuccessful trials of both cast basalt and hi-chrome castings as lining materials for handling the hot clinker.
The problem was that, although the course clinker was suspended and conveyed hydraulically, the internal surface of the pipeline was subjected to severe abrasion and erosion.
“We know from experience that there is no ’one- size- fits- all’ solution in wear protection systems,” said Kingfisher MD, John Connolly. “Each application has to be considered individually; it has to be surveyed and considered before a tailored solution can be arrived at.”
Kingfisher recommended its 25mm thick K-ZAS ceramic lining system. The system was supplied in cylinder form, to ensure that internal concentricity was maintained, and that the impact and sliding wear resistant characteristics of the K-ZAS liners were employed to the full.
Rated nine on the MOHS hardness scale and having excellent thermal shock resistance, Kingfisher’s K-ZAS ceramic liner is said to handle the severe abrasion and corrosion resulting from conveying hot coarse clinker to an ash reception hopper.
The lining comprises three raw materials: zirconia, alumina and silicon. These are crushed, screened and fed into an electric arc furnace where they are smelted at 1450 degrees C. The molten material is cast in moulds, where the final components are annealed.
