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Slag formation in incinerator

Q: I am working for a local oil refinery to find a solution to a problem they are having with their off-gas incinerator at the end of a rotary kiln calciner. When it is necessary to perform maintenance on the unit, it must cool down. Therefore, during the cooling process, the slag that has accumulated within the incinerator has nowhere to go, resulting in deformation of the incinerator structure. What is a suitable solution in this matter?

A: It is not completely clear as what exactly is happening. But I have two suggestions:

1. Remove the cause of slag formation from the source. Evaluate if there is a way to prevent slag formation.
2. Strengthen the incinerator structure such that the deformation does not occur?