Automatic logic optimization of denitrifying ammonia system for supercritical unit

Abstract

Abstract Based on the optimization of the automatic logic of the supercritical unit denitrifying ammonia system in a power plant, a cascade control system with the output NOx concentration as the main control loop and the supply ammonia flow as the secondary control loop is proposed, and on the basis of the cascade control system, the control strategy for eliminating system interference is added. Increase the response rate of the system. In particular, when the NOx concentration at the entrance fluctuates considerably, the optimized ammonia injection system quickly issues instructions to the ammonia flow regulator to adjust the NOx concentration at the flue gas outlet so that it tends to set values in a short period of time.