Cement kiln hot raw material dechlorination system

The utility model relates to a cement kiln hot raw material dechlorination system which comprises a constant feeder, a suspension cooling device, a gas-solid separation device, an exhaust device and an air cannon, and the constant feeder is suitable for quantitatively conveying part of hot raw materials in a fifth-stage cyclone into the suspension cooling device; the gas-solid separation device is used for carrying out gas-solid separation on the hot raw material cooled by the suspension cooling device; the air exhaust device is suitable for exhausting the gas filtered by the gas-solid separation device into an external environment; the air cannon is arranged on the portion, between the suspension cooling device and the constant feeder, of the feeding pipe and suitable for blowing air into the feeding pipe regularly to prevent material accumulation. A certain amount of the chlorine-containing hot raw material is taken out from the fifth-stage cyclone cylinder in the preheater system, so that the chlorine circ