In order to effectively solve the high temperature corrosion problem of water wall of a 600 MW swirl opposed fired boiler

a new type of combined closing-to-wall air device based on secondary air and compressed air was proposed

and a numerical simulation model was established to study the flow

combustion and component concentration in the furnace before and after installing the new type of combined closing-to-wall air. The results show that

after installing the new combination closing-to-wall air

the O_2 mole fraction in the area near the water wall on side wall increases substantially

while the CO mole fraction and flue gas temperature decrease significantly

which effectively improves the reducing atmosphere in the area near the water wall and solves the problem of hightemperature corrosion

but the NO_x emission increases slightly.