SCR denitration ammonia spraying control method and system based on mechanism and data driving

One or more embodiments of the invention provide an SCR denitration ammonia injection control method and system based on mechanism and data driving. The SCR denitration ammonia injection control method comprises the following steps: acquiring operation data of a selective catalytic reduction SCR denitration reactor, based on a pre-established mechanism model, obtaining a first prediction value ofthe nitrogen oxide concentration at the outlet of the SCR denitration reactor according to the operation data, based on a trained neural network model, calculating according to the operation data to obtain a second prediction value of the nitrogen oxide concentration at the outlet of the SCR denitration reactor, correcting the first predicted value by using the second predicted value to obtain a corrected nitrogen oxide concentration value, calculating a difference value between the corrected nitrogen oxide concentration value and a nitrogen oxide concentration value set in the SCR denitrationreactor, and controlling