(57) The utility model discloses a cement kiln flue gas self-denitration device, relates to the technical field of cement production, and solves the technical problem that in the prior art, pulverized coal combustion space of a decomposing furnace is reduced, so that pulverized coal is post-burnt. The cement kiln flue gas self-denitration device comprises a decomposing furnace, a denitration furnace and a tertiary air pipe, the bottom of the denitration furnace is communicated with the kiln tail of the cement kiln; two ends of the decomposing furnace are respectively communicated with the top of the denitration furnace and an inlet of the C5 cyclone; and the tertiary air pipe is communicated with the decomposing furnace. CO generated in the denitration furnace serves as a reducing agent of nitric oxide, the denitration furnace provides sufficient reduction reaction space, the residence time of the cement kiln flue gas is long enough and reaches 10-20 times of the given time in the specification, then the nitric oxide in the cement kiln flue gas is reduced by CO to tend to zero, the self-denitration process of the cement kiln is achieved, and the self-denitration effect of the cement kiln is improved. And the effect of low emission of nitric oxide of the cement kiln is achieved.
(71) Shaanxi Boneng Industrial Tech Co Ltd; Li Xiangdong (CN)