The performance of SCR denitrification system is depend on the uniformity of mixing the nitrogen oxides entered into the denitrification reactor with the reducing agent ammonia and the distribution of flue gas velocity.A new type vortex ammonia-spraying and mixine facility has been put forward

and the three dimensional numerical simulation of its flow field being carried out.The analysis shows that the vortex ammonia-spraying and mixing facility can uniformly mixing the flue gas entered into the first layer of catalyst with the ammonia

the deviation of ammonia concentrat in cross-section of the catalyst inlet is less than 10%

boasting good mixing effectiveness.After arranging four baffle plates at equal distance into two bends of the flue duct and arranging eleven baffle plates at equal distance on upper part of the reactor

the deviation of flue gas velocity field is less than the designed requirement 15%.Therefore

the new type vortex ammonia-spraying and mixing facility can fully substitute the conventional ammonia-spraying grate.