Superheated steam temperature control optimization for a boiler after low NO_x combustion retrofitting

Overhigh or overlow superheated steam temperature in boiler will significantly affect safety and economy of power plants.The superheated steam temperature control system has such characteristics as large delay,multiple disturbance factors and high requirements for control precision and stability.On the basis of the actual operation parameters and superheated steam temperature characteristics of a sub-critica1600 MW unit boiler after low NOxcombustion transformation,the superheated steam temperature control strategy was optimized.The improved control system can regulate the superheated steam temperature fluctuation within±4.5℃,indicating the control quality of the system has been dramatically enhanced.