Blast furnace blowing-in oxygen lance and blowing-in method

Abstract

The invention discloses a blast furnace blowing-in oxygen lance. The blast furnace blowing-in oxygen lance comprises an oxygen lance body and is characterized in that the oxygen lance body comprises an iron notch connecting section and an air source connecting section, the iron notch connecting section comprises an iron notch connecting inner pipe and an iron notch connecting outer pipe, an innerthread section of the air source connecting section is in threaded connection with an outer thread connecting part of the iron notch connecting section, a first compressed air conveying channel and asecond compressed air conveying channel form a communicated compressed air conveying channel, and an air source connecting inner pipe and the iron notch connecting inner pipe form a communicated oxygen conveying channel. The invention further discloses a method for blowing in by using the oxygen lance. The oxygen lance is divided into the iron notch connecting section and the air source connectingsection, and the air source connecting section can be recycled, so that the part outside the iron notch can be effectively recycled, the air source connecting section can be timely disconnected, theblowing-in cost is saved, the manufacturing difficulty can be reduced, and only the part extending into the iron notch is manufactured during blowing-in each time, the rear section can be reused, andthe blowing-in efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace start-up, and in particular relates to a blast furnace start-up oxygen lance and a furnace start-up method. Background technique [0002] Blast furnace start-up is a complicated and systematic work. Hearth heating is the focus of blast furnace start-up and an important factor determining the success of the start-up. At present, it is generally believed that the oxygen lance can quickly heat the hearth, and the increasingly severe environmental protection The situation also put an end to the opening of the iron nozzle, and only the oxygen lance can be used to open the furnace. Improve the success rate of the furnace, but the use of the oxygen lance and the specific adjustment method of oxygen and air determine the actual effect of the oxygen lance. Burning out prolongs the start-up time of the blast furnace. The furnace hearth is not well heated, and slag and iron are prone to low temperatur...

AI Technical Summary

Problems solved by technology

[0002] Blast furnace start-up is a complicated and systematic work. Hearth heating is the focus of blast furnace start-up and an important factor determining the success of the start-up. At present, it is generally believed that the oxygen lance can quickly heat the hearth, and the increasingly severe environmental protection The situation also puts an end to the opening of the iron nozzle, and only the oxygen lance can be used to open the furnace.

Improve the success rate of the furnace, but the use of the oxygen lance and the specific adjustment method of oxygen and air determine the actual effect of the oxygen lance. Burning out prolongs the start-up time of the blast furnace. The furnace hearth is not well heated, and slag and iron are prone to low temperature and no flow, which causes great difficulties in starting the furnace and removing iron.

[0003] Using an oxygen lance to open the furnace is currently the most commonly used form of furnace opening. Most of the current oxygen lances are sleeve-type, and the air and oxygen are simply introduced and adjusted by a valve. The operation is rough and cannot be adjusted accurately. The oxygen lance is basically burned and cannot be recycled, which is also a waste. This patent adopts a two-section structure. The part that goes deep into the iron hole is the inner section, and the other part is the outer section. When tapping is required, the outer section can be cut off directly, and it is easy to control the state of the iron hole

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