Abstract: With the stricter national standards on NO_x emissions set in China, the low NO_x combustion technology will be much more widely adopted in boiler combustion optimization. In this paper, a series of study on the closed loop control system for low NO_x combustion and the state controller of SCR spraying ammonia grille tone is conducted in consideration of the optimization of low NO_x combustion technique and SCR denitration system. In the study, the optimization strategies are proposed and the comprehensive optimization system for boiler combustion and denitration operation is developed. The engineering practice shows that, under different load conditions, by virtue of the comprehensive optimization system in practice, the denitration efficiency is improved while the NO_x emission concentration and ammonia escape rate are lowered down at the outlet of SCR reactor. In this way the national standard requirements of gas turbine emissions can be met.

Key words: NOx, low nitrogen combustion, SCR, ammonia escape