High-blast-temperature energy-saving and emission-reducing combined type preheating system for blast furnace

Abstract

The invention relates to a high-blast-temperature energy-saving and emission-reducing combined type preheating system for a blast furnace, which belongs to the technical fields of energy saving, emission reduction and iron and steel smelting equipment. The high-blast-temperature energy-saving and emission-reducing combined type preheating system for the blast furnace comprises a cold coal gas inlet pipeline, a cold air inlet pipeline, a hot air furnace, a combustor, a preposed combustion furnace, a preposed furnace blower, an air preheating combined type heat pipe heat exchanger, a coal gas preheating combined type heat pipe heat exchanger, a draught fan and a chimney. The high-blast-temperature energy-saving and emission-reducing combined type preheating system for the blast furnace has the advantages of economic operation, energy saving and wide application to the iron and steel smelting industry.

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 system 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 temperature of ...

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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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