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A systematic study was conducted to examine the cause of severe cracking of SS304L/SA210 composite waterwall tubes at primary air ports in the recovery boiler at the Irving Pulp & Paper - Saint John mill. The results show that the severity of the cracking problem was strongly related to the frequency and the magnitude of tube temperature excursions at the air ports. The cracking problem has been significantly reduced by operating the boiler at a lower black liquor solids content and at a higher primary air flow. These operating conditions appear to keep the char bed away from the air ports and help reduce tube temperature excursions.
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Modifying Boiler Operation to Reduce Primary Air Port Cracking in a Recovery Boiler, 2002 Fall Techn