Reducing agent spraying gun is an important factor influencing denitrification efficiency of the SNCR system.Thus

denitration experiments were carried out on a 75t/h high temperature separation circulation CFB boiler

with different spray guns.Moreover

the effect of jet velocity and particle size on denitration efficiency of the SNCR system was experimentally studied in lab-scale.The engineering test results show that

under full load condition and the spray gun output of 80kg/h

the denitration efficiency of the fan gun was about 9%to 11% higher than that of the conical gun.Furthermore

with a constant ammonia nitrogen ratio

denitration efficiency of both guns increased with the gun output.The laboratory test results show that

compared with the conical gun

the fan gun's spray velocity was 2.8m/s higher and its atomized particle size was about 17μm to 28μm smaller

indicating it is more helpful to enhancing the denitration efficiency.