The invention discloses a boiler
flue gas
denitrification control method based on a self-adaptive
fuzzy PID algorithm. The implementation processes comprises the following steps of collecting an actual measured value of the
nitrogen oxide at a
flue gas outlet, and calculating a deviation value and a change rate of the
nitrogen oxide at the
flue gas outlet; determining membership functions of
nitrogen oxide deviation, a deviation change rate, a proportion change value, an integral change value and a differential change value; outputting a new
fuzzy set membership function according to a fuzzy control rule, calculating the proportional change value, the integral change value and the differential change value according to the
fuzzy set membership function, and adjusting corresponding parameters in the PID in real time to obtain new PID parameters; and controlling the
ammonia spraying amount according to the new PID parameters. According to the
denitrification control method disclosed by the invention, the PID
control parameters can be adjusted by adopting a
fuzzy control algorithm, on one hand, the condition that the content of
nitrogen oxide at the outlet exceeds the standard irregularly can be avoided; on the other hand, the usage amount of
ammonia gas can be more reasonably and efficiently controlled.