The
ammonia spraying grid of the SCR denitration
system comprises an
ammonia spraying main
pipe,
ammonia spraying
branch pipes, spraying heads and a
rotational flow mixer, wherein the ammonia sprayingmain
pipe is provided with the multiple ammonia spraying
branch pipes, the ends, away from the ammonia spraying main
pipe, of the ammonia spraying
branch pipes are arranged upwards and connected withthe spraying heads, and the
rotational flow mixer is fixed to the spraying heads; the
rotational flow mixer comprises a
barrel, a support and rotational flow blades, the
barrel is of an up-down hollow structure, the inner wall of the
barrel is connected with the spraying head through the support, and the rotational flow blades are fixed to the portion, above the support, of the inner wall of thebarrel in a circumferential array mode. The
system has the advantages that through the arrangement of the rotational flow blades,
flue gas in the SCR denitration
system can generate strong rotationalmotion after flowing through the the rotational flow blades and can entrainment
ammonia gas sprayed out of the spraying heads at the upper parts of the ammonia spraying branch pipes, so that the
ammonia gas is strongly mixed with the
flue gas, the
mixing effect of the
flue gas and the
ammonia gas is enhanced, and the denitration reaction efficiency is improved.