Reduction Rate Control

Recovery boiler reduction rate can be controlled by stabilizing char bed conditions and then using an online
reduction efficiency measurement in a feedback control loop to maximize recovery boiler reduction efficiency.
Char bed stabilization is achieved by using a combination of feedforward and feedback controls for black liquor
firing and air distribution. Reduction efficiency measurement is used to optimize air distribution and black liquor
droplet size to maximize reduction efficiency on a continuous basis. Maximized reduction efficiency results in
increased efficiencies throughout the liquor cycle and can result in debottlenecking of the chemical recovery
process. This control strategy was first implemented at a European mill in 2016 and has since been deployed across
the globe. Data from these implementations demonstrate how the controller can regulate and maximize recovery
boiler reduction efficiency. North American mills have the same opportunity for recovery boiler and reduction
efficiency optimization.

Firing liquor, droplet trajectories, visual analysis, recovery boiler

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Author: Travis Conner
Reduction Rate Control, 2022PEERS/IBBC Conference (22PEE/22I

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