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The composition of carryover particles is of great importance in determining to the ability of the particles to form fireside deposits on recovery boiler superheater tube surfaces. Field studies were performed on three recovery boilers using a specially-designed probe to determine the composition of carryover particles in the superheater region. The results show that carryover particles contain less chloride (Cl) and potassium (K) than black liquor from which they originate, and contained more total sulphate and less carbonate than oxidized smelt. The carbonate content of carryover deposits decreased only slightly with sampling time, suggesting that although some sulphation of the carbonate in carryover may have occurred after deposition, the majority of the sulphation occurred before deposition. Oxidized smelt does not give a reasonable first approximation of carryover composition.
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Field Studies on Composition of Carryover Particles in Recovery Boilers, 2005 Engineering, Pulping &