The automatic control system of flue gas denitrification for 2×300 MW units in Sanhe Power Plant has been presented

the control strategy of said control system not only has simple algorithm process

but also uses the mole ratio corresponding to the follow-up relation and the proportional control mode

solving the difficult problem of controlling the concentration of NOx at exit of flue gas due to its large inertia.Through inspection of actual operation parameters

it shows that the said control system has strong robustness

satisfying better the requirements of automatic control in flue gas denitrification

having stronger universality and practicality for selective catalystic reduction(SCR)denitrification system.