Novel cement kiln denitration reactor device

The utility model provides a novel cement kiln denitration reactor device. The novel cement kiln denitration reactor device comprises a preheating decomposition reaction unit, a denitration reaction unit, a denitration reaction furnace body, a decomposition furnace and a rotary kiln, a smoke outlet of a kiln tail smoke chamber of the rotary kiln extends upwards and is provided with a kiln tail smoke chamber throat, the upper end of the kiln tail smoke chamber throat is communicated with a denitration reaction unit, the upper end of the denitration reaction unit is communicated with a first inlet of a denitration reaction furnace body, and a first fuel inlet and a first raw material inlet are formed in the side wall of the denitration reaction unit. A tertiary air pipe is arranged on the inlet side of the preheating decomposition reaction unit, the preheating decomposition reaction unit is vertically arranged, the top end of the preheating decomposition reaction unit is communicated with a second inlet of the