Blast furnace cooling tuyere

Abstract

Disclosed is a blast furnace cooling tuyere. The blast furnace cooling tuyere comprises a front cap, a middle cap and a rear cap, wherein a cavity structure is enclosed by the front cap, the middle cap and the rear cap. A partition plate is arranged between the front cap and the middle cap to divide the cavity structure into a front cavity and a rear cavity. A cooling water inlet pipe and a cooling water outlet pipe are arranged in the rear cavity. The partition plate is provided with a partition plate water inlet hole and a partition plate water outlet hole. The cooling water inlet pipe and the cooling water outlet pipe communicate with the partition plate water inlet hole and the partition plate water outlet hole correspondingly. The front cavity is internally provided with a front cavity partition plate, and the front cavity partition plate is positioned between the partition plate water inlet hole and the partition plate water outlet hole. The cooling capability of a tuyere small sleeve can be improved, and the hidden danger of water leakage caused by a traditional casting structure can be eliminated, so that the service life of the tuyere can be prolonged, and the service quality and the combustion rate are improved.

Description

technical field [0001] The invention relates to a blast furnace cooling tuyere. Background technique [0002] Blast furnace tuyere is an important process part of blast furnace for air supply and coal injection. It is composed of three parts: large sleeve, middle sleeve and small sleeve, and is installed in the furnace wall between the bosh and the hearth. Among them, the tuyere small sleeve is generally made of copper, cooled by cooling water inside, set in the innermost part of the furnace wall and protrudes into the furnace to prevent hot air and coal powder from directly washing the furnace wall. [0003] The small tuyere is responsible for sending hot air into the blast furnace. Its front end is a high-temperature environment of nearly 2000 ° C. The temperature of the slag-iron solution is above 1400 ° C. The temperature of the hot air passing through the small tuyere is also above 1000 ° C. The small tuyere The working environment is extremely harsh, not only to withs...

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Problems solved by technology

However, this structure greatly reduces the water speed of the cooling water, and the water pressure will also be affected. The reduction of the water speed weakens the thermal conductivity of the tuyere sleeve and increases the wear of the tuyere; at the same time, it also increases the probability of scale formation. Scale will seriously deteriorate the heat transfer between the wall of the tuyere and the cooling water

[0006] On the other hand, the traditional complex inner cavity structure can only be formed by casting and welding, and there are problems such as casting cracks, slag inclusions, easy damage to the welds, difficult welding, and easy slag staining on the welds, and it is easy to leak during use.

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