Effects of SO2 on Super Heater Fouling in Kraft Recovery Boilers, 2006 Engineering, Pulping, and Environmental Conference

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A study was carried out using an Entrained Flow Reactor (EFR) to examine the effect of SO₂ concentration in the combustion gas on the deposition rate, composition and adhesion strength of carryover deposits produced from burning dried black liquor. The results imply that SO₂ is not the main cause of fouling in the superheater region of recovery boilers. High SO₂ may even be beneficial, as it helps produce deposits that are easier to be removed by sootblowers. In recovery boilers where high SO₂ and excessive carryover fouling are observed at the same time, it is likely that they are a result of other boiler operating factors.