In order to meet the environmental protection requirements of ultra-low emissions

the selective noncatalytic reduction(SNCR) system of some circulating fluidized bed(CFB) units needs to be adjusted by excessive injection of ammonia

resulting in excessive ammonia escape and ash accumulation blockage in tail duct. This article introduces three ways to reduce the consumption of reducing agents in engineering applications

including low-nitrogen combustion in furnace

optimization of denitration lances

and model predictive control

as well as the operation strategies and transformation directions of these three corresponding methods. Against the development and deficiencies of the existing technologies

a new technology for suppressing CFB pollutants based on gas composition partitioning is proposed. This technology can accurately control different areas of the CFB boiler

optimize the combustion process

deeply inhibit the original generation of NO_x

and reduce the consumption of denitrification reducing agent. It has the advantages of simple construction and low investment. It is suitable for the optimization and transformation of newly-built units and in-service units.