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Two or three times of converter dust removal is an important link in iron and steel smelting

Nov 09,2023

The second and third dust removal of the converter is an important link in the steel smelting process. The purpose is to remove slag and other impurities, improve the quality of slag and molten steel, and ensure the quality of steel products.

Converter dust removal is generally divided into two parts: secondary dust removal and tertiary dust removal. Secondary dust removal is to set up dust removal equipment above the converter body, through the exhaust fan to extract the flue gas at the top of the converter, after filtering by the dust removal equipment, discharge clean flue gas. The main function of secondary dust removal is to remove dust from slag and furnace dust and reduce environmental pollution.

The three dust removal is carried out in the molten steel pouring into the bag to remove the gas and impurities in the molten steel. When the converter is poured, a large amount of gas, such as CO, CO2, H2, etc., will be produced in the molten steel due to the high temperature. These gases will affect the quality and performance of molten steel, so dust removal treatment is required. In the process of dumping, molten steel flows into the bag from the converter, enters the bag through the mouth of the bag, and descends along the wall of the bag. Gas and impurities will be eliminated in this process, thus ensuring the quality of molten steel.

The specific operation steps of the converter two or three times dust removal are as follows:

1. Secondary dust removal: dust removal equipment is installed at the top of the converter, such as bag dust collector, electrostatic dust collector, etc., and the flue gas from the top of the furnace is extracted into the dust removal equipment. After the flue gas is filtered, clean flue gas is discharged.

2. Three times dust removal: pour the molten steel into the bag, enter the bag through the mouth of the bag, and descend along the wall of the bag. Gas and impurities will be eliminated in this process. This process needs to control the speed of the furnace and the gas flow in the bag, so that the gas and impurities can be discharged smoothly.

The key of three times dust removal is to ensure the smooth progress of the furnace and control the speed of the furnace. Tilting furnace speed is too fast will lead to gas and impurities can not be removed in time, affecting the quality of molten steel; Tilting furnace speed is too slow will extend the smelting time, affecting production efficiency. Therefore, in the converter two or three times dust removal, it is necessary to reasonably control the tilting speed according to the specific situation to ensure the dust removal effect and the quality of molten steel.

The second and third dedusting of converter is an important link in iron and steel smelting and a key step to ensure the quality of molten steel and iron and steel products. Through reasonable dust removal operation and control, slag and other impurities can be effectively removed, the quality of molten steel can be improved, and the quality of steel products can be guaranteed. At the same time, it can also reduce environmental pollution and protect the ecological environment. The implementation of secondary and tertiary dedusting of converter is of great significance to the sustainable development of iron and steel smelting industry.

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