Partial auto-causticization using B has become an interesting option for de-bottle-necking the re-causticization department in the chem. recovery cycle of kraft pulp mills. Several full-scale trials in North America showed that the auto-causticization concept using B works efficiently in recovery boilers. However, more information is needed of the detailed influence of B on the operation of the recovery boiler. Some 1st information of the influence of the meta-borate addn. on the liquor burning properties, smelt bed melting behavior, and fireside deposit characteristics in super-heaters is presented. The information is based on multi-phase chem. equil. calcns. of the furnace processes and results obtained by using a single droplet burning test facility. The presence of B lowers the melting temp. range of the smelt and the carry-over liquor residue particles. Larger B addns. also changed the burning behavior of the black liquor studied. The characteristic swelling during the devolatilization stage decreased, which resulted in somewhat longer burning times. The measured release of C and the formation of NO and SO2 from the burning droplet were not changed significantly.
|Title of host publication||International Chemical Recovery Conference : changing recovery technology to meet the challenges of the pulp and paper industry|
|Publication status||Published - 2001|
|MoE publication type||A4 Article in a conference publication|
|Event||conference; 2001-06-11; 2001-06-14 - Château Whistler Resort, Whistler, British Columbia, Canada|
Duration: 11 Jun 2001 → 14 Jun 2001
|Conference||conference; 2001-06-11; 2001-06-14|
|Period||11/06/01 → 14/06/01|