Question
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FCC regenerator flue gas line refractory repeated failure is being experienced. Exact location of failure is at immediate downstream of the flue gas slide valve (Double disc type). Even after replacing the refractory in turnaround, hotspots developed early into unit operation. The dryout was carried out as per standard procedure and there were no thermal shocks due to sudden feed outage. Kindly suggest the reasons for this failure and if any modification in refractory type of design may help to avoid this in future.
Mar-2022
Answers
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Jeffrey Bolebruch, Blasch Precision Ceramics, Inc., jbolebruch@blaschceramics.com
As a supplier of prefired net shapes, I cannot speak to the dryout schedule. It sounds as though you are cognizant of the need to properly dry out/cure out the material, so the odds that it is related to improper placement are smaller, although not zero. Perhaps there is some non-homogeneity in the material, or some reason why specific area(s) failed to fill. Perhaps it is a tight/difficult area to fill. You might consider a precast shapes if it is a complex area or a small diameter, that could hinder your ability to place the material.
Mar-2022
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