Method for preventing dry dedusting system of semi-steel making converter from blowing and venting

Abstract

The invention provides a method for preventing blowing explosion venting of a dry dust-removing system of a semi-steel steelmaking converter. The method comprises the following steps: adding semi-steel into a 180-260T steelmaking converter; after the beginning of blowing, within 60s, controlling the oxygen blowing amount to be 18000-24000Nm<3> / h and controlling the position of an oxygen lance at 2-2.4m; after blowing for 60-90s, controlling the oxygen blowing amount to be 28000-32000Nm<3> / h; after blowing for 90s, controlling the oxygen blowing amount to be 40000-45000Nm<3> / h; after the beginning of blowing, within 30s, adding a combustion accelerator into the converter and controlling the bottom blowing gas supplying amount to be 400-600NL / h; within 30-600s of blowing, reducing the bottom blowing gas supplying amount and controlling the bottom blowing gas supplying amount to be 300-500NL / h; after blowing for 600s, controlling the bottom blowing gas supplying amount to be 800-1200NL / h. By the method, in the smelting process of the converter, the dry dust-removing system can be protected from explosion venting.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and more specifically relates to a method for reducing or preventing explosion venting of a dry dust removal system in the process of semi-steel making. Background technique [0002] In the existing technology, the dry dust removal system is mainly used to purify and recover the flue gas generated by the semi-steel steelmaking converter. When the CO, O in the electric field of the dust collector 2 When the gas content reaches a certain proportion, it may cause an explosion. Therefore, the electrostatic precipitator (EP) is equipped with an explosion venting device. Once an explosion occurs in the dust collector, it can be automatically opened to discharge the burning and expanding gas in time and can be automatically reset to reduce The degree of damage of the dust collector ensures the long-term operation of the dust collector, but each explosion vent will also cause damage to the equipment,...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, the dry dust removal system is mainly used to purify and recover the flue gas generated by the semi-steel steelmaking converter. When the CO, O in the electric field of the dust collector 2 When the gas content reaches a certain proportion, it may cause an explosion. Therefore, the electrostatic precipitator (EP) is equipped with an explosion venting device. Once an explosion occurs in the dust collector, it can be automatically opened to discharge the burning and expanding gas in time and can be automatically reset to reduce The degree of damage of the dust collector ensures the long-term operation of the dust collector, but each explosion vent will also cause damage to the equipment, so how to prevent explosion venting becomes an important factor to prolong the life of the dry dust removal system

[0003] At present, only manufacturers using double-link technology use semi-steel smelting. Compared with molten iron smelting, semi-steel smelting is more prone to blowing and venting with dry dust removal system of converter. Therefore, semi-steel steelmakers using dry dust removal system need to Considering the difficulties of semi-steel making, you have to face the problem of "explosion venting" in the steelmaking process. The problem of blowing and venting is more serious when the amount of slag flowing from the converter is large or when scrap steel is added.

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