On the basis of a customized isothermal thermo-gravimetric test rig

the NO formation characteristics during pulverized coal combustion at high temperature and low oxygen atmosphere were investigated

by simulating the furnace flue gas atmosphere.The results show that

in flue gas atmosphere

with an increase in temperature

the combustion rate and peak increased

the burn-out time shortened

the NO instantaneous formation peak went forward and the NO emissions mainly concentrated in early reaction stage.The release of volatile was affected mainly by temperature

which makes the combustion rate increase slightly in the initial stage of combustion.High oxygen volume fraction resulted in more release of NO in early reaction

which means the proportion of volatile NO would increase.The higher the coal rank

the weaker the heterogeneous reduction function of NO and the larger the cumulative NO emissions.With an increase in water vapor concentration

the combustion rate increased and this influence was little in the initial combustion stage but dramatic in the late stage.At 1 300 ℃

it will go against the combustion rate if CO2 concentration was increased to 15%

but the presence of water vapor and CO2 with a certain concentration range can reduce NO emissions.