In unit 2 of Anhui Qianyingzi Power Generation Co.

Ltd.

before optimization on the analog control system

the main steam pressure deviation was large and the convergence of main steam pressure control was slow under steady-state condition. Meanwhile

the main steam temperature in the low and medium load section could not reach the rated temperature. Under variable load condition

the main steam pressure deviation was large and the feed water automatic tracking was poor. Under high load condition

due to the input of coal slime

the main parameters of the unit changed more violently

and the overpressure of the main steam pressure was serious

which affected the safe and stable operation of the unit. The whole process of the air and smoke system cannot be put into automatic mode

as a result

the load change rate of the unit was only 2 MW/min

which can not meet the relevant provisions of the power grid. In order to solve the problems existing in unit 2

the main analog control system of the unit was optimized. The water supply setting curve and the superheat setting curve of the intermediate point were modified. The oxygen control

primary air volume control and secondary air volume control strategies were modified. The variable load feed forward was increased

and the fuel volume

water supply flow and total air volume entering the furnace were dynamically coordinated. After optimization

the actual load change rate of unit 2 under AGC mode reached 5.25 MW/min

and the main parameters of the unit changed smoothly under steady-state and variable load conditions.