To prevent high temperature corrosion of water walls in boiler furnace and reduce NOxemission from a Russian-made 530 MW unit coal fired boiler

the non-symmetrical high speed closing-to-wall air system was designed and applied.Moreover

the corresponding combustion adjusting tests were carried out.The results show that

after the technical transformation and the combustion adjusting tests

the atmosphere close to the water wall was improved obviously

the high temperature corrosion on the water wall was dramatically prevented

the NOxconcentration at the SCR reactor inlet can be kept between 150mg/m~3 and 170mg/m~3

and the boiler efficiency can be increased by 0.2%.The operating security

economy and environmental protection performance of the boiler improved obviously.The results have a demonstration function for NOxemission control and prevention of high temperature corrosion on water walls of the wall type opposed firing boilers.