In allusion to a 660MW supercritical boiler after the transformation of low NOx swirl burner

through the variable conditions (different oxygen

different air distri-bution mode

the secondary air opening

the central air opening

different air swirl intensity of the tertiary air and the quartic air

etc.)

the NOx emission characteristics and burner economy were measured.The test results showed that there are oxygen

the operation of air distribution of different layers burner and burner adjustment has certain in-fluence on the emission of NOx.The Operation suggestions were given:1) the oxygen should be controlled at about 2.3%

the environmental protection and economic of boiler could get balance; 2) the air distribution of different layers of burner should adopt as tower form

i.e.the upper burn-er throttle opening 40%

middle opening 60%

the lower opening 80%; 3) the burner adjustment should following this settings:the central air burner and secondary air holds a small opening

tertiary air vane angle of 30 degrees

quar-tic air vane angle of 45 degrees.