Blast furnace reducing tuyere short set

Abstract

The invention relates to a blast furnace reducing tuyere short set which comprises a short set body provided with an air inlet end and an air outlet end, wherein the short set is internally provided with an air flue, a valve cavity is arranged between the middle of the short set body and the air outlet end, the air flue expands towards two opposite radial directions of the short set body simultaneously so as to form the valve cavity, the valve cavity is internally provided with a pair of throttle cores, when the pair of throttle cores is at a radial approaching position, the air flue is at the throttle state that a circulation surface is locally covered, when the pair of throttle cores is at a radial separation position, the air flue is at an opening state that the circulation surface is completely opened, and the valve cavity is provided with two control holes capable of controlling the throttle core to move; and the short set is also provided with a cooling channel for cooling the short set. After the structure of the buffer precooling slag liquid pool is adopted, the internal diameter of the tuyere short set can be adjusted in the production process of the blast furnace according to the furnace condition, and blowing-in speed can be improved in real time according to needs under the condition that the constant blowing-in pressure is maintained.

Description

technical field [0001] The invention relates to a small set of variable-diameter tuyeres of a blast furnace, which belongs to the technical field of blast furnaces. Background technique [0002] According to the applicant's understanding, the blast furnace production needs to increase the air supply speed according to the actual demand, so as to improve the blast furnace condition and increase the iron output. Although there have been some improved technologies related to the small tuyeres, none of them can increase the air supply speed in real time on demand while keeping the air supply pressure constant during the blast furnace production process. For example, the Chinese utility model patent with the authorized announcement number CN2797375Y discloses a blast furnace tuyere reducing sleeve, which can be placed in the tuyere to reduce the tuyere area to increase the wind speed, but the reducing sleeve can only be used when the blast furnace is turned on or shut down. When...

AI Technical Summary

Problems solved by technology

Although there have been some improved technologies related to the small tuyeres, none of them can increase the air supply speed in real time on demand while keeping the air supply pressure constant during the blast furnace production process.

For example, the Chinese utility model patent with the authorized announcement number CN2797375Y discloses a blast furnace tuyere reducing sleeve, which can be placed in the tuyere to reduce the tuyere area to increase the wind speed, but the reducing sleeve can only be used when the blast furnace is turned on or shut down. When the wind is blowing, put it into the small tuyere cover, which cannot be used as needed during the blast furnace production process

In addition, because the ambient temperature of the small tuyere sleeve is as high as 1500°C-2800°C during operation, the service life of the small tuyere sleeve is short. When the service life is about to expire, the furnace must be shut down to replace the small tuyere sleeve, and the shutdown of the furnace is expensive. Hinder the economic growth of enterprises

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