The cement plant burns 100% anthracite, the self-denitrification effect is poor, the initial emission concentration of NOx is high, the CO concentration at the outlet of the calciner is high, and the SNCR denitrification efficiency is low. By installing new ammonia injectors at different heights of the calciner, ammonia mist droplets are sprayed into the flue gas to accelerate the mixing of ammonia and NOx. And an intelligent control model is established to dynamically adjust the amount of ammonia injected in different temperature ranges of the pyro system to reduce the total amount of ammonia injection. It tests the denitrification effect of different layers of spray guns, and determines the inlet and outlet of C6 as the best spray points for denitrification of spray guns, etc. After the transformation, the high-efficiency SNCR denitrification efficiency of T cement plant can reach 75%. Compared with the denitrification efficiency of burning anthracite and bituminous coal, if the burning anthracite is adjusted to burning bituminous coal, the denitrification efficiency of T cement plant can be further improved.