The invention relates to a dry desulfurization, denitration and dust removal device for low-
sulfur flue gas in
cement kiln tail. The dry desulfurization, denitration and dust removal device includes acement
kiln, a decomposing furnace, a suspension preheater, a cooling device, a desulfurization
tower, a dust remover and a medium-temperature SCR denitration device, wherein the
cement kiln, the decomposing furnace, the suspension preheater and the cooling device are successively connected, an air inlet pipeline of the desulfurization
tower is connected with a
flue gas outlet of the cooling device, and the desulfurization
tower is a circulating
fluidized bed dry desulfurization tower with the
low density, a low
bed and no water spraying; the air inlet pipeline is provided with a high-temperature fan, and connected with a raw mill, a desulfurizer bin and a
smoke dust return device; a
flue gas inlet of the dust remover is connected with a
flue gas outlet of the desulfurization tower, and aby-product outlet of the dust remover communicates with the air inlet pipeline through the
smoke dust return device, and is connected with a
raw material warehouse through a by-product conveying device; and a
flue gas inlet of the medium-temperature SCR denitration device is connected with a
flue gas outlet of the dust remover, an air outlet pipeline of the medium-temperature SCR denitration device is successively provided with a
waste heat boiler and an induced draft fan, and discharges purified gas through a
chimney. According to the dry desulfurization, denitration and dust removal device,synergistic removal of multi-component contaminants can be achieved while high-efficiency desulfurization, denitration and dust removal are achieved,
corrosion prevention is not needed,
zero waste water discharge and transparent
chimney discharge are achieved, and meanwhile long-term stable operation can be achieved.