In this study

the NO_x emission characteristics of the combustion of low calorific value gasification gas of nitrogen-containing solid materials such as biomass are studied. Ammonia is added into flue gas as a nitrogencontaining component

and then mixed with multiple component gases with a certain proportion to form artificial gas. The effects of ammonia concentration

combustion temperature and excess air coefficient on NO_x emission are investigated under premixed combustion and forced convection diffusion combustion of nitrogen-containing gas. The results show that NO_x produced by the combustion of nitrogen-containing gas is mainly NO

and the small amount of generated NO_2 is mainly formed by the oxidation of NO. With the increase of ammonia concentration

the concentration of NO emission increases

but the ratio of NH_3 converted to NO decreases. And the conversion rate of ammonia to NO is higher under premixed combustion than under forced convection diffusion combustion. Under premixed combustion

the higher the temperature is

the higher the concentration of NO emission is. However

under forced convection diffusion combustion

the concentration of NO emission increases with the increase of temperature at the low temperatures

but decreases at the high temperatures. The excess air coefficient has greater influence on NO emission under forced convection diffusion combustion than that under premixed combustion

and the excess air coefficient promotes NO_2 emission under two combustion conditions. At a certain combustion temperature and ammonia concentration

there is a suitable premixed ratio of 40% in the staged combustion organization

which makes the NO emission minimum.