Soot blower lance tube corrosion in recovery boilers

摘要

Severe internal corrosion of soot blower lances in two recovery boilers was likely a result of flue gas infiltration into the lance tubes,which formed an acidic condensate that rapidly attacked the lance material.The problem was rectified by improvements to the low pressure air system that ensure continuous purging of the soot blower lances to keep the flue gases out.The experience highlights the importance of a properly functioning purge air system for soot blowers.