A worn furnace hood does not have to be built anew. How to tell whether the steel structure underneath will still carry a second lining.
When the lining of a furnace hood has reached its end, talk quickly turns to a new build. That is rarely necessary. The hood consists of two parts with very different lifespans: a steel structure that lasts for decades, and a refractory lining that wears out considerably sooner. In one project we separated exactly those two — the steel structure stayed, only the lining was renewed.
The decision is not made on the condition of the lining — by definition that is worn out — but on the condition of the steel underneath. This check belongs at the start of the discussion, not at the end.
Worn hood of an aluminium melting furnace: the steel structure was retained and only the refractory lining selectively renewed – at a fraction of the cost of a new hood.
Complete refractory lining of the furnace hood on an aluminium melting furnace – executed monolithically for dense, dimensionally stable surfaces.
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