In order to verify the effects of swirl intensity on miniature cone stationary combustion burner(EV burner)

the flue gas analyzer was used to detect the concentration of NOxin flue gas under different working conditions

and the computational fluid dynamics software Fluent was applied to carry out the simulation.Experimental results show that

under rated condition

strong swirl intensity stabilized the combustion and reduced the NOxconcentration by 21.2%.However

when the flow rate was low

with strong swirl intensity the combustion became instable

and the NOxconcentration increased by 6.2%

the mixing degree of the air and fuel decrased to about 0.42×10-5 when the back-flow weakened.Therefore

during the EV burner's design

for different flow rates

different swirl intensities should be adopted.