Blast furnace tuyere small sleeve and manufacturing method thereof

Abstract

The invention discloses a blast furnace tuyere small sleeve. The blast furnace tuyere small sleeve comprises a tuyere small sleeve body, a water channel and a sealing plate, wherein the tuyere small sleeve body is formed by pouring molten copper into a casting film, the water channel is embedded into the casting film in advance, and the tuyere small sleeve body and the water channel are of an integrated structure; and the sealing plate is welded to the end face of the air outlet end of the tuyere small sleeve body, and a water inlet and a water outlet of the water channel are both located in the air inlet end of the tuyere small sleeve body. The invention further provides a manufacturing method of the blast furnace tuyere small sleeve. The blast furnace tuyere small sleeve and the manufacturing method thereof have the advantages that the water channel is integrally cast by burying a copper pipe, the water channel is in seamless contact with a water jacket after casting, the thermal resistance is low, the heat conduction effect is good, and a flow channel is smooth without dead angles.

Description

technical field [0001] The invention relates to a small blast furnace tuyere cover and a manufacturing method thereof. Background technique [0002] The main function of the small blast furnace tuyere is to supply air to the blast furnace and provide the oxygen needed for fuel combustion. At the outlet of the small tuyere, oxygen, coal powder, and coke burn violently, generating a lot of heat, and the temperature is very high, generally exceeding 1500°C. The small tuyere jacket is generally made of copper alloy with a copper content of not less than 99.5%, and its melting point is about 1050°C. In order to prevent the water jacket from being burned, circulating water is circulated inside the water jacket to cool the water jacket. [0003] In recent years, with the increase of the oxygen enrichment rate of the blast furnace, the temperature at the outlet of the tuyere casing has further increased, and some have exceeded 2000°C, making it easier for the outlet of the tuyere c...

AI Technical Summary

Problems solved by technology

[0005] (1) The small tuyeres are easily worn by high-speed coal injection, which affects the ventilation of the water jackets to the blast furnace, and even leaks in severe cases;

[0006] (2) The water channel inside the water jacket is prone to dead angles, local high temperature, easy to form a local vacuum to local overheating, causing the front end of the tuyere small sleeve to melt and collapse at high temperature;

[0007] (3) The weld is prone to water leakage after being heated

[0009] (1) easy to leak

Due to the poor welding performance of copper, the welding quality is not easy to guarantee, resulting in water leakage after welding, low manufacturing yield, and some water jackets leak after working for a period of time

[0010] (2) The outlet of the water jacket is prone to overheating, melting and collapse

Because the structure of the internal waterway is too simple, the waterway has an internal dead angle, and the local area is easy to overheat, and the heat conduction efficiency is not high. When encountering unstable combustion, the heat conduction will not be timely, so that the outlet is easy to overheat, melt and collapse

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