In the process of solid biomasses combustion

fuel nitrogen will transform into nitrogen oxides(NOx)

resulting in environment pollution. To reveal the conversion mechanism of NOx

the authors summarize the relevant literatures. The previous studies show that

the main components of nitrogen contained in solid biomass fuel are protein

and the distribution of amino acids in the protein presents a high degree of consistency. The fuel nitrogen will pyrolyze at first during the solid biomass combustion

of which the productions would be distributed in the volatiles

tar and coke. Then

the volatiles and tar will further crack to form gaseous nitrogen materials such as NOxprecursor. Finally

the coke nitrogen and gaseous nitrogen burns to produce NOx. The formation of NOx is related to the biomass species

thermal factors(temperature

heating rate)

reaction atmosphere and other conditions(additives). The current research only found some common experimental rules

and did not confirm the detail transformation mechanism of fuel nitrogen. It is a new trend to study the conversion of fuel nitrogen by using model compound pyrolysis coupled with computational chemistry.