Formation of blue deposits in kraft recovery boilers, TAPPI JOURNAL March 2016

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ABSTRACT: Fireside deposits in recovery boilers are typically white, red, pink, grey, black, or occasionally yel-low, depending on where they are in the boiler, the mechanisms by which they are formed, and the environment to which they are exposed. Although rare, blue deposits have been reported, and some were “bluer” than others. This study systematically examines the cause of the blue coloration of deposits in recovery boilers. The results show that for a deposit to become blue, it must a) contain sodium carbonate, b) contain a small amount of manganese, c) be molten or partially molten, and d) have exposure to an oxidizing atmosphere. Because deposits always contain sodi-um carbonate and manganese, these requirements suggest that blue deposits can form only in the superheater region of the recovery boiler when oxidizing conditions prevail. Blue coloration is thus more likely to be observed in boilers operating at a reduced firing load with a high excess oxygen target.

Application: Blue deposits have more or less the same chemical and thermal properties as normal pink or white deposits, and should be treated in the same way.