Based on characters of boiler capacity variation and the influence of low NOx staged burning technology for air upon the burn-away process of puvlerized coal with air flow

the matchability of said staged burning technology with the boiler capacity

as well as the feasibility and limiting factors for adopting the said staged burning technology to medium and small capacity boilers

have been analysed.Study shows that the said staged burning technology of air

including measures for separating the over-fired air

is better matched with large-capacity boilers for untis above 600 MW

however

for boilers of units with capacity 300 MW

the problem of said staged burning technology affecting the burn-away process of pulverized coal should be solved.