The invention discloses an SCR (
selective catalytic reduction) denitration device and an SCR denitration method applied to high-dust-content
smoke from a
kiln tail of a
cement clinker
production line. The device comprises a
cement kiln decomposing furnace, a preheater, an afterheat boiler, a raw mill, an electric dust remover and a
kiln tail chimney which are connected in sequence along the
smoke direction, and further comprises an SCR reactor, wherein the SCR reactor comprises a reactor shell; an inlet divergent section is arranged at the top of the reactor shell, and an ash bucket is arranged at the bottom of the reactor shell; an inlet
flue of the SCR reactor is connected with the preheater and the inlet divergent section and is provided with a
reducer sprayer; a plurality of catalyst
layers are arranged in the reactor shell in sequence from top to bottom; a plurality of steam ash blowers correspond to the catalyst
layers one to one and are arranged above the corresponding catalyst
layers; an outlet
flue of the SCR reactor is connected with the bottom of the reactor shell and an upstream
flue or a downstream flue of the afterheat boiler and is additionally provided with a high-temperature fan. On the basis that a high-temperature dust remover is not arranged, the SCR denitration device can
handle with the
smoke characteristics of high
NOx load fluctuation, temperature fluctuation and high dust content.