The characteristics of self-denitrification in biobriquettes are studi
ed experimentally. To enhance effective utilization of low-grade coals
, and to control emission of environmental pollutants from combustion,
a new artificial solid fuel, a biobriquette with a self-denitrificati
on function, is developed. It was produced by the mixture of low-grade
coal, cornstalk as biomass and pulp black liquid as denitrificazer un
der a high compression pressure condition. Both experiments of pyrolys
is and combustion were performed in order to reveal the mechanism of n
itrogen-oxide formation and denitrification of the biobriquette.It is
found that the release fraction of fuel-N is raised with increasing py
rolysis temperature in both coal and biomass. The release fraction of
fuel-N in biomass is much higher than coal at the same pyrolysis tempe
rature. The conversion fraction of fuel-N to NO slightly ascends and t
he fraction to N2O slowly descends with increasing furnace temperature
, but the sum of conversion fraction of fuel-N to NO and N2O appears t
o be independent of furnace temperature. The denitrification process o
f the biobriquette with the pulp black liquid appears to proceed as tw
o stages, namely the volatile combustion stage and the char combustion
stage. Denitrification mainly happens in the char combustion stage. A
denitrification efficiency of 40% can be obtained in the biobriquette
combustion with a pulp black liquid of 10 mass%. Finally, it is confi
rmed for the first time that the pulp black liquid has significant den
itrification capabilities in the biobriquette combustion.