High wind temperature energy saving and emission reduction combined preheating method for blast furnace

Abstract

The invention relates to a high wind temperature energy saving and emission reduction combined preheating method for a blast furnace, and belongs to the technical field of energy saving and emission reduction and steel smelting equipment. The method comprises the steps of: mixing hot smoke from a hot blast furnace and a front combustion furnace; then exchanging the heat of the mixed smoke with that of cold air and cold gas respectively; supplying the hot air and the hot gas formed after the heat exchange to the hot blast furnace; meanwhile, supplying the hot gas and air which is from a blower of a front furnace to a burner. By the preheating method, a secondary air turbolator heat exchanger is not needed, and control valves and connection pipelines which are used in the method are greatly reduced, so that installation is facilitated, cost is reduced, the probability of reducing leakage is facilitated and maintenance is convenient.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction and iron and steel smelting equipment, and in particular relates to a combined preheating technology method used in an ironmaking blast furnace hot blast stove. Background technique [0002] Among the existing iron and steel production equipment, there is a "blast furnace high air temperature combined heat exchange system" (patent number: ZL200420024014.9), which is mainly composed of a hot blast stove, a front combustion furnace, an air spoiler heat exchanger, and a gas heat pipe for heat exchange. It is composed of heat exchanger, air heat pipe heat exchanger, smoke exhaust fan, pre-furnace blower, cold gas main pipe, cold air main pipe and proper pipelines and valves. When working, multiple hot blast stoves are used to provide hot blast to the blast furnace in turn. Under the same premise, the higher the temperature of the hot blast stove vault, the higher the temp...

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Problems solved by technology

[0003] (1) Due to the installation of a turbulent heat exchanger for secondary air preheating in the system, the total weight of the equipment is still too large;

[0004] (2) The flow resistance on the air side and the flue gas side is relatively large;

[0005] (3) The number of valves in the system is too large;

[0006] (4) The spoiler heat exchanger is arranged vertically, and the heat exchange tube is arranged horizontally. When the temperature of the flue gas in the smoke mixing tube is improperly controlled and exceeds 650°C, the heat exchange tube is easily deformed and burned, and air leakage occurs Phenomenon

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