Denitration dilution air system and coking plant flue gas treatment system

The utility model provides a denitration dilution air system and a coking plant flue gas treatment system, and relates to the technical field of flue gas treatment systems.The denitration dilution air system comprises a denitration device, a mixer and a hot blast stove, and the inlet end of the mixer is connected with an ammonia supply pipeline and an air supply pipeline; the outlet end of the mixer is connected with the denitration device, the air outlet end of the hot-blast stove is connected with the air supply pipeline, the air inlet end of the hot-blast stove is connected with a desulfurized tail gas pipe, the desulfurized tail gas pipe is provided with a first air entraining power device, and the first air entraining power device is an air heater; the coking plant flue gas treatment system comprises the denitration dilution air system. The mixed gas in the mixer has high ammonia gas temperature, on one hand, the optimal reaction temperature range in the denitration process can be achieved, the denitrati