Blast furnace tuyere small sleeve

Abstract

The present invention provides a blast furnace tuyere small sleeve and a manufacturing method thereof. The blast furnace tuyere small sleeve comprises a tuyere body having a hot air center channel entrance, a water inlet hole and a water drainage hole, wherein a pure copper hollow annular tuyere wall manufactured by adopting hot extrusion molding is adopted, the tuyere body and the tuyere wall are subjected to welding connection, and the tuyere wall has a long wall n shape. With the blast furnace tuyere small sleeve, disadvantages of short service life, low production efficiency and high production cost of the existing tuyere structure can be overcome.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a blast furnace tuyere cover. Background technique [0002] Blast furnace tuyere is mainly used in iron and steel, metallurgy and chemical industries, and is a key component to ensure the normal production of blast furnace. The high-temperature hot air blown through the blast furnace tuyere and the furnace bottom coke are oxidized and burned to generate CO2, and CO2 is reduced to the form of oxide during the high temperature rise the presence of iron. Blast furnace tuyeres are 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 iron and the wear of falling hot materials. It is easy to be damaged. The blast furnace is shut down, making the blast furnace low production. [0003] Among them, the blast furnace tuy...

AI Technical Summary

Problems solved by technology

At present, most of the small sets of blast furnace tuyere are made of pure copper integral casting or separate casting and welding, and its average service life is only 2 to 3 months. This is mainly due to the occurrence of pores, looseness, cracks, burrs, Defects such as burrs lead to the following problems, including: poor thermal conductivity of the product due to poor tissue density and burning, product inner cavity caused by casting sticky sand causing poor water flow and burning, welds too close to the front of the tuyere and Water leakage caused by local casting defects, low hardness of the product due to casting defects, unable to meet the service life under harsh conditions, or increased surface roughness caused by casting burrs, etc., requiring subsequent machining processes, resulting in reduced production efficiency

[0005] Now there are also some methods of spinning or rolling the copper plate into the tuyere wall, but due to the small process deformation of the copper plate, most of them cannot meet the one-time processing of the long wall “∩” shaped tuyere wall structurally.

This makes the inner and outer walls of the tuyere must be divided into two parts, and one side must have the shape of " , so that when the inner and outer walls of the split-type tuyere sleeve are welded, the weld at one end is too close to the front end of the tuyere sleeve, and the weld seam that has been in a harsh environment for a long time is most likely to crack and cause water leakage

Moreover, when the spinning process is used, the structure of the slewing hood will have the phenomenon of sine value deviation caused by artificial calculation, and defects such as bulging diameter and metal bumps will appear during the spinning process. For this type of tuyere, please refer to Chinese patent CN2844127Y and CN2799576Y

[0006] In addition, there are small tuyeres that are formed by forging. However, if the long wall "∩" shaped tuyere wall is to be forged, it is affected by the stroke of the air hammer. Reduced production efficiency and increased production costs; at the same time, forging belongs to cold processing, which will virtually increase the tonnage of the forging press, resulting in increased equipment costs and poor practicability

[0007] In addition, in order to save costs, some manufacturers will use methods such as forging and casting to weld the tuyere body made of cheaper steel with the tuyere wall made of pure copper, or spin the cast tuyere body with pure copper plate The tuyere walls are welded together, but such a combination is either due to the poor quality of the welds resulting in water leakage due to different materials, or the short service life of the entire tuyere due to the poor casting quality of the tuyere body

[0008] It can be seen that the small tuyere sleeves made by the above structure and process all have the disadvantages of low production efficiency, high production cost, and short life, and frequent replacement of the small tuyere sleeves will also reduce the stability of the blast furnace operation, reduce the output, and cause labor costs. increased labor intensity

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