By using FTIR SO2-detecting system of tube-type furnace

the SO2-releasing regularity during mixedly burning Shenhua coal

cornstalk

and bark with different proportioning ratio has been studied.Results show that the SO2-releasing amount was decreased as the proportioning ratio was increased

the cause is that the sulphur content in mixed fuel of coal and biomass has somewhat reduced

in addition

during the time of mixedly burning coal and biomass

the self-desulphurization(SD) is made up of three parts

namely SD of coal

SD of biomass

and SD in coordination

and the effectiveness of SD in coordination is remarkable.Along with the increase of proportioning ratio

the contribution ratio of SD in coordination is firstly increased

and then being decreased

existing a maximum value;the transform ratio of fuel into sulphur in flue gas is firstly decreased and then being increased

existing a minimum value.In case of mixedly burning Shenhua coal with cornstalk or bark

the optimal proportioning ratio is 50%.Along with the increase of proportioning ratio

the begining time of SO2-releasing is gradually moved up

and the time needing for releasing is also gradually reduced.