Combined with the situation of using air-staging low NOx burners on boilers with different combustion modes for two 600 MW units

the serious problems

such as bad combustion efficiency

slagging

and corrosion etc.

resulted from air-staging combustion have been analysed.Analysis show that the air-staging combustion technology is easily to result in slagging on main combustion area

high-temperature corrosion on heating surface

bad economy in combustion

and decreasing of boiler's thermal efficiency.For these

the air-staging degree can be suitably reduced

or adopting special measures to prevent slagging and high-temperature corrosion

so as to avoid the decreasing of safety and economy of boilers at the same time of reducing NOx emission.