Compensation process of high furnace iron-making air blast system

Abstract

the invention discloses a compensating method of high-furnace melting blowing system in the pig-iron smelting domain, which is characterized by the following: the smelting hot wind is blown in the high-furnace through pipe and vent, which adopts multiple-vent correlating adjusting and single-vent compensating pattern separately to compensate oxygen-rich air flow; the oxygen-rich air flow is sent in the high-furnace through gradation pipe, aerating detector and straight-blowing pipe; the wind quantity of oxygen-rich air flow is controlled by aerating detector, single-vent processor and CPU, which is moulded by dynamic valve to make each vent and combusting strength approach balance.

Description

technical field [0001] The invention belongs to pig iron smelting, in particular to an air supply method for blast furnace ironmaking. Background technique [0002] In blast furnace smelting, according to the furnace condition model and operation requirements, air is continuously supplied to the blast furnace to ensure the production and operation of the blast furnace. At present, the blast furnace air supply adopts centralized air supply. The cold air is blown into the hot blast furnace by the blower, and the hot air is generated through heat exchange. The hot air is sent into the blast furnace through the blast furnace surrounding pipe and each tuyere. This process is relatively simple in terms of the blast kinetic energy adjustment method. The air volume, air temperature, oxygen enrichment and even coal injection are adjusted as a whole. Although the theoretical calculation and design of the blast furnace air supply system are based on the premise that the blast kinetic e...

AI Technical Summary

Problems solved by technology

At present, the blast furnace air supply adopts centralized air supply. The cold air is blown into the hot blast furnace by the blower, and the hot air is generated through heat exchange. The hot air is sent into the blast furnace through the blast furnace surrounding pipe and each tuyere. This process is relatively simple in terms of the blast kinetic energy adjustment method. The air volume, air temperature, oxygen enrichment and even coal injection are adjusted as a whole. Although the theoretical calculation and design of the blast furnace air supply system are based on the premise that the blast kinetic energy of each tuyere is equal, in the actual smelting process, due to the performance of the furnace material and the The structure is different, the chemical and physical changes of gas, solid and liquid phases are complicated, and the influence of operation and other factors causes some tuyere to be active and some tuyere to be less active, resulting in inconsistent kinetic energy of blasting required by each tuyere and unbalanced furnace conditions.

The defect of this air supply system is that the overall adjustment cannot well adapt to the changing and complex furnace conditions, and the blast furnace production is difficult to operate; pipeline strokes are prone to occur, resulting in material collapse and sitting, affecting product quality and technical and economic indicators of blast furnace smelting

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