Method and device for improving reduction efficiency of furnace stack by using high-reactivity coke

The invention relates to a method and a device for improving reduction efficiency inside a blast furnace by using high-reactivity coke. A method for improving reduction efficiency of a furnace stack of the blast furnace is characterized in that the iron-containing furnace charge of the blast furnace contains sintered ore, pellet and lump ore, high-reactivity coke is used in the blast furnace, and the sintered ore is disposed at the periphery of the high-reactivity coke. According to the invention, on the premise of not increasing process flow and equipment complexity, started from the clue of improving the reaction efficiency inside the blast furnace, the method for improving reduction efficiency inside the furnace by using the high-reactivity coke, namely the traditionally conceptual poor-quality coke, is developed. The promotion effect of coke reactivity to iron ore reduction and the condition that the effect of the high-reactivity coke can be better exerted by matching the high-reactivity coke with which ore type are researched by experiments, thereby laying the foundations for use of the high-reactivity coke in the blast furnace. The method not only can improve the reduction efficiency of the furnace stack, but also effectively expand the coke use range of the blast furnace.