Abstract: Good results have been obtained after reforming the pulverized coal system of #11 boiler in Wangting Power Plant. The maximum deviation of air and coal powder in deferent layer was less than ±10%, which is favorable for the balance of flue gas flow from two sides of furnace outlets, implementation of low NOx emission and steady combustion in boiler lowload. Now flue gas temperature deviations between two sides before hightemperature reheater are controlled in 15℃. No blockage in pulverized coal pipe, no overtemperature tubebursting and other bad phenomenon have been occurred until now, and unburned carbon content in the fly ash has decreased year by year.

Key words: concentration deviation, pulverized coal distributor, optimizing combustion