The problem of pollutant emission in the process of developing large-scale power generation by burning directly the biomass have drawn more and more attention.The sulphide and nitrogen oxides are two kinds of main atomospheric pollutants

seriously threatening the natural environment.Combined with the existed form of sulphur in the biomass

the influence of conditions

such as temperature and ash composition etc.

upon sulphur migration in burning process of biomass

as well as sulphur-solidifying behavior in the biomass proper

have been far more discussed in the studies already made.With regard of formation for nitrogen oxides

the studies are mainly concentrated on the formation of prodromal matters (i.e.NH3

HCN

and HNCO etc.) for nitrogen oxides in the process of pyrolysis.For this

combined with existing form of nitrogen in the biomass

the influence of conditions

such as temperature

fuel sort

and temperature rise rate etc.upon teh formation of prodromal matters for nitrogen oxides

as well as the formation mechanisms of nitrogen oxides in the process of burning volatile matters have been summarized up.