Feed-forward automatic control method for ultralow emission of nitrogen oxide based on SCR (Selective Catalytic Reduction) method

The invention relates to an SCR method for removing nitrogen oxides NOX. A feedforward automatic control method for ultralow emission of nitrogen oxide based on an SCR method comprises the steps that the real-time concentration C1 and the real-time flow Q1 of nitrogen oxide NOx at an inlet of a denitration reactor are obtained, the real-time concentration C2 and the real-time flow Q2 of nitrogen oxide NOx at an outlet of the denitration reactor are obtained, the proportion of escape ammonia gas at the outlet of the denitration reactor in the actual value of the given amount of ammonia water is obtained, and the actual value of the given amount of ammonia water is calculated; the flow Q4 of the ammonia water nozzle at the inlet of the denitration reactor is obtained, and in the initial state, Q4 is the theoretical ammonia water flow for complete reaction of the real-time concentration C1 of the NOx at the inlet of the denitration reactor and the real-time flow Q1. After the new feedforward control method is ad