System for reducing coal gas consumption and ultra-low smoke emission of blast furnace hot blast stove

The invention belongs to the technical field of flue gas emission systems of hot blast stoves, and particularly relates to a system for reducing coal gas consumption and ultra-low flue gas emission of a blast furnace hot blast stove. According to the technical scheme, the system for reducing the coal gas consumption and the ultra-low smoke emission of the blast furnace hot-blast stove comprises a smoke pipeline and a plurality of hot-blast stoves, smoke outlets of the hot-blast stoves are connected with the smoke pipeline through smoke branch pipes, and the smoke pipeline is sequentially connected with a denitration device, a heat exchanger set, a desulfurizing tower, a dust remover and an induced draft fan through pipelines; the system further comprises a combustion-supporting air pipeline and a gas pipeline, the combustion-supporting air pipeline is connected with the hot-blast stove through a combustion-supporting air branch pipe, the gas pipeline is connected with the hot-blast stove through a gas branch