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- W805770477 abstract "The aim of this thesis is to investigate the possibility to improve the separation ofHCl and SO2 in the dry ue-gas treatment for boiler #3 at Fortum's thermal powerplant in Hogdalen; by using a model predictive control instead of a PID controllerto govern the slaked lime injection.To achieve this an ARMAX model was derived using MATLAB's System Identication Toolbox and measurements of the incoming and outgoing levels of HCl,SO2 and the speed of the injection motor. The ARMAX model was then convertedto a state space model which will be used as the internal model for the MPC predictions.The cost function was a quadratic problem which included the error betweenthe output and the set points, the change rate of the input and the inputs deviationfrom a default value. The MPC uses both a feedforward and a feedback loop to estimatethe error over the prediction horizon. The controller also utilizes the abilityto set constraints and tuning of the cost function weights.In conclusion, the thesis shows that a MPC controlled lime injection is possibleand would o er some unique possibilities such as: natural constraints handling,more intuitive live tuning for the operator and prioritized input control. Howeverthe dry scrubber still struggles to suppress high amounts of incoming SO2 and sincethe project lacked a measuring unit for incoming HCl concentration the resultsshowing an improvements in pollution separation was not conclusive." @default.
- W805770477 created "2016-06-24" @default.
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- W805770477 date "2015-01-01" @default.
- W805770477 modified "2023-09-26" @default.
- W805770477 title "Simulating MPC Controlled Lime Injection for the Flue-gas Treatment at Fortum's Thermal Power Plant" @default.
- W805770477 hasPublicationYear "2015" @default.
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