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Fluffy dust/fume deposits on tube surfaces in recovery boilers may sinter and become resistant to sootblowing if they are exposed to high temperature flue gases. The sintering tendencies of precipitator dusts from numerous kraft mills were examined using a novel technique and were ranked according to an index that relates closely to the dust sintered strength. The results show that chloride and potassium contents had the most significant effects on dust sintering, while highly sulfated dusts did not sinter appreciably below 600o C. The sintering tendency was strongly related to the dust first melting temperature and un-compacted bulk density. Black liquor firing load, solids content and sulfidity also had an effect on dust sintering tendencies.
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The Sintering Tendency of Recovery Boiler Precipitator Dusts, 2002 Fall Technical Conference