Air classification combined with high temperature ammonia-injection denitrification has high denitrification efficiency and no ammonia escape

which provides a new way to realize denitrification in furnace. The experiment of air classification combined with high temperature ammonia-injection denitrification was carried out in a liquid slag-discharging cyclone furnace. The results show that

the NO_x generation mass concentration can be reduced by 35% when the excess air coefficient of main combustion zone is 0.8. The temperature window of high temperature ammonia-injection is 1 200～1 600 ℃. The optimum ammonia-injection point is at the outlet of cyclone. When the ammonia-nitrogen ratio is 2.0

the denitrification efficiency reaches 20%(the maximum). When the bituminous was burned and air classification combined with high temperature ammonia-injection denitrification was adopted in the cyclone furnace

the mass concentration of NO_x emission can be reduced to 490 mg/m~3.