Investigation of Fume Formation During Pyrolysis of Black Liquor Drops, 1991 Forest Products Symposium Proceedings
Recent studies indicate that sodium evolution during black liquor devolatilization may produce a significant amount of the fume in an operating recovery-furnace. In this investigation, single drops of industrial black liquor were exposed to a flowing gas stream of 95% N2 with 5% CO or 02 over a temperature range of 500-900 degrees Celsius.
After 3-30 seconds in the pyrolytic environment, the char particles were withdrawn and quenched in a nitrogen stream. Sodium mass loss was determined from the measured amount of residual sodium in the char particles. Approximately 10-20% of the sodium present in the black liquor solids was released during swelling and devolatilization of single drops of black liquor. Continued sodium release only occurred after swelling was complete at 900°C. Additional experiments are planned to investigate the nature of the fugitive sodium.
Investigation of Fume Formation During Pyrolysis of Black Liquor Drops, 1991 Forest Products Symposi
