Flue gas denitration treatment device of cement grinding system

The invention discloses a flue gas denitration treatment device of a cement grinding system. The device comprises a GGH flue gas heat exchanger, a low-temperature catalyst SCR reactor and a variable-frequency fan, wherein the GGH flue gas heat exchanger is provided with a first input end, a first output end, a second input end and a second output end; an outlet flue gas pipeline of a bag-type dustcollector of the cement grinding system is communicated with the first input end; the first output end is communicated with a gas inlet end of the low-temperature catalyst SCR reactor; a gas outlet end of the low-temperature catalyst SCR reactor is communicated with the second input end; and the second output end is communicated with the variable-frequency fan. The low-temperature catalyst SCR reactor adopts a low-temperature catalyst and is further matched with the GGH flue gas heat exchanger for use, so that the denitration function is effectively realized and the operation cost of the device is reduced; the indepe