Stacked-Air System Improves Recovery Boiler Operation, 2004 International Chemical Recovery Conference

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Interstate Paper, Riceboro, Georgia, installed a Stacked-Air combustion air system on their recovery boiler in May 2003. The new combustion air system improved run time, through put, emissions, reduction efficiency, auxiliary fuel usage, and char bed control. Instrumental to the success of the system was the use of computational fluid dynamic (CFD) modeling of the recovery boiler. Five potential solutions were examined and compared to the base case condition. Extensive data was collected of the before and after conditions including interior gas temperatures, physical carryover and operational data. The historical operation of the boiler is described and the benefits of the new combustion air system are reviewed. The before and after conditions predicted by the CFD modeling are compared. The boiler performance data is compared to the modeling predictions to illustrate the accuracy of “best practice” CFD modeling. The boiler performance data is also used to document the improved operation of the boiler. This case study illustrates the benefits of innovative combustion air systems and CFD modeling for improving the operation of recovery boilers.