Power station SCR denitration modeling method based on selective integration model

Abstract

The invention belongs to the field of thermal automatic control, and discloses a power station boiler SCR denitration modeling method based on a selective integration model library. The method comprises the following steps: (a) acquiring parameter values of an inlet and an outlet of a power station SCR reactor for multiple days, dividing the parameter values into a training set and a test set, selecting a learner, and training by using data of the training set to obtain a plurality of models to form a model library; (b) predicting a predicted value at each moment in one day by using the modelin the model library; and (c) t = t + 1, returning to the step (b), after prediction of all moments of one day is completed, updating the model library, taking the updated model library as the currentmodel library, and returning to the step (b) until updating of the model library of the last day in the test set is completed, thereby obtaining the final required model library, namely completing modeling of power station SCR denitration. Through the method, the problems of data screening and parameter adjustment caused by model updating are greatly reduced, the manual action is reduced, and theintelligent degree is higher.

Description

technical field [0001] The invention belongs to the field of thermal automatic control, and more specifically relates to a modeling method for power plant SCR denitrification based on a selective integration model. Background technique [0002] With the increasingly stringent environmental protection regulations, flue gas denitrification technology has become an essential flue gas treatment device for coal-fired power plants. Selective Catalytic Reduction (SCR) technology has been widely used in coal-fired power plants due to its mature, high-efficiency and stable characteristics. Accurate and efficient ammonia injection control method is the key to improving the denitrification efficiency and ensuring the safe operation of the system. Insufficient ammonia injection will lead to lower denitrification efficiency and excessive NOx concentration at the flue gas outlet; excessive ammonia injection will cause additional ammonia escape, increase the formation of ammonium bisulfat...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a selective integration model-based SCR denitrification modeling method for power plants. By establishing a model library about the parameter values ​​at the inlet and outlet of the SCR reactor in the power plant, the current There is the problem of inaccurate control of ammonia injection amount due to model failure. By adopting the model library established by the present invention, the prediction of nitrogen oxides at the outlet under variable working conditions can be realized, so as to adjust the amount of ammonia injection and avoid NO X The problem of excessive ammonia escape when the emission exceeds the standard

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