Blast furnace provided with oxygen-enriched coal injection tuyere and melting process

Abstract

The invention belongs to the technical field of metallurgical equipment, and particularly relates to a blast furnace provided with an oxygen-enriched coal injection tuyere and a melting process. The blast furnace comprises a furnace hood, a furnace body, a furnace bosh and a furnace hearth arranged in sequence, wherein a blast furnace tuyere is arranged between the furnace bosh and the furnace hearth, and comprises a large jacket, a middle jacket and a small jacket on the wall of the furnace bosh, a blast pipe is arranged at the center of the small jacket, and a first water jacket is arrangedinside the middle jacket; a temperature reducer is installed on the outer side of the blast pipe, the inner cavity of the temperature reducer is filled with cooling water, and a plurality of uniformlydistributed fins are arranged on the side wall; and a coil pipe is arranged between the small jacket and the outer wall of the temperature reducer, filled with air at normal temperature and connectedto an air pump. Through a three-layer circulating cooling system arranged in the tuyere, a structure of water cooling with the middle jacket, air cooling with the small jacket, and water cooling on the outer side of the blast pipe in the center is formed, and the purposes that the blast furnace tuyere can withstand high temperature and heat fatigue, overcome abrasive erosion and prolong the service life are realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a blast furnace provided with an oxygen-enriched coal injection tuyere and a smelting process. Background technique [0002] The smelting of the iron and steel industry is a process in which the charge is loaded from the top of the blast furnace into the furnace for smelting to obtain steel, in which the setting and structure of the tuyere is one of the key components. It not only directly provides the oxygen and coal powder required for blast furnace smelting, but also provides the gas power required to overcome the resistance of the blast furnace material column, and transfers high-temperature gases such as oxygen and coal powder to the blast furnace. Therefore, the blast furnace tuyere should have the characteristics of good conductivity, uniform cooling, high cooling efficiency, compact structure, and good wear resistance. It is usually installed ...

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Problems solved by technology

It is usually installed in the furnace wall between the bosh and the bottom of the furnace. The front section has 500mm protruding into the furnace. It is directly subjected to the thermal erosion of liquid slag and iron and the severe wear of falling hot material. It is easy to fail. If the tuyeres are replaced frequently, it will cause Shutdown of the blast furnace will lead to low production of the blast furnace

[0003] The operating environment of blast furnace tuyere is extremely harsh. It not only has to withstand high temperatures above 1500°C, but also bears the erosion of high-temperature iron flow and the wear of furnace materials and slag. Blast furnace tuyere is subjected to high temperature, corrosion, thermal fatigue, abrasive erosion (wind speed > 150 m / s and containing coal powder) and other harsh environments, so the service life is short

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