Intelligent ammonia spraying control method and system for SCR (Selective Catalytic Reduction) denitration system

The invention discloses an intelligent ammonia injection control method and system for an SCR (Selective Catalytic Reduction) denitration system, which are used for predicting the concentration of nitrogen oxide at an inlet of a reactor through an NOX generation quantity prediction model based on historical operation data of the denitration reactor and solving the problem of prediction lag caused by insufficient consideration of time dimension in the existing method. A denitration efficiency function is established by integrating indexes which can be determined by boiler load, reactor inlet flue gas temperature, ammonia nitrogen molar ratio and the like, and dynamic response of the denitration reaction process to the load is realized; a denitration reaction model is established in combination with an efficiency function, global optimization is performed on the reaction model by using a differential evolution algorithm to determine denitration reaction model parameters, and the accurate ammonia injection amoun