The atomizing particle size of a Y-jet partial-inner-mixed pneumatic atomizing selective non-catalytic reduction(SNCR) lance is decreasing along with the increase of gas loss rate

and with the increase of atomizing medium in case of the gas loss rate being the same.The moving locus of atomizing pariticles injected into a 100 MW four-corner tangential firing pulverized coal boiler has been studied by using CFD software platform and adopting numerical simulation method.It is obtained that the best injected atomizing particle size is between 0.3~0.5 mm in the case of injection rate being equal to 25 m/s.A denitrification test with injection of urea solution into boiler has been carried out

the denitrification efficiency is inceasing at first

and then decreasing along with the increase of atomizing particle size.In the event of the chemical equivalence of ammoniacal nitrogen being equal to 1.5

the maximum denitrification efficiency can reach 58%.