Evaporation Plant And Recovery Boiler Optimization Utilizing Model Predictive Control Technology – A Case Study At Suzano Três Lagoas Mill, 19PEERS



The Evaporation Plant and Recovery Boiler Optimization project has revealed a potential to increase energy revenues. By using a predictive control model in an evaporation plant, it was possible to reduce the dry solids content variations of the heavy black liquor by 50 % and increase the content average from 81.2 % to 82.0 %. By controlling the inflow of the high secondary and tertiary air flows to the recovery boiler, the residual oxygen was reduced from 3.0 to 2.3 %, with a standard deviation reduction from 0.32 to 0.14 %, i.e. a 56 % reduction. Overall, this resulted in an increase of 2.7% high pressure steam generation on the recovery boiler. This increase correlated to a gain in revenue and estimated delivery of electricity to the grid, worth about 2 million USD per year. 

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