Long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick

Patent metadata

Field	Value
Publication number	US-11667982-B2
Application number	US-202117476501-A
Country	US
Kind code	B2
Filing date	Sep 16, 2021
Priority date	Jan 26, 2021
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick belongs to the field of steelmaking technologies using powder-bottom-injecting converters. According to equipment characteristics, process characteristics, and erosion characteristics of the powder-bottom-injecting converter, the design, arrangement, installation, use, maintenance, and replacement of the bottom purging/powder injection bricks are systematically optimized and improved, a technology of automatically detecting the erosion height of bottom purging bricks is adopted, and hot replacement of bottom purging/powder injection bricks and hot replacement of the converter furnace bottom are used collaboratively, which not only can prolong the service life of a single bottom purging/powder injection brick, but also can greatly prolong the overall life of the powder-bottom-injecting converter from 1000-3000 heats in the prior art to 6000-10000 heats. Hence, the life of the powder-bottom-injecting converter is as long as that of a conventional converter.

First claim

What is claimed is:

1. A powder-bottom-injecting converter comprising:
a converter body;
a detection system configured to detect an air flow and issue an erosion warning signal; and
a plurality of independently removable converter bottoms, a first converter bottom of the plurality of the independently removable converter bottoms is assembled on the converter body, each of the plurality of the independently removable converter bottoms comprises:
a first group of purging base bricks, wherein each of the purging base bricks in the first group comprises a through hole, and
a plurality of bottom purging/powder injection bricks each installed in a corresponding through hole, wherein each of the bottom purging/powder injection bricks comprises:
a powder transport pipe, configured for purging/powder injection when steelmaking;
an annular gap pipe, configured for ventilating; and
a plurality of capillary metal tubes buried inside each of the bottom purging/powder injection bricks, with respective upper ends of the capillary metal tubes buried at different height positions inside each of the bottom purging/powder injection bricks and blocked by each of the bottom purging/powder injection bricks, and respective lower ends of the capillary metal tubes connected to a gas source; and when each of the bottom purging/powder injection bricks is eroded to a height where the respective upper ends of the capillary metal tubes are located, the capillary metal tubes are exposed from a blocked state to an unblocked state, and an air flow inside the capillary metal tubes is detected by the detection system and an erosion warning signal is issued by the detection system in response to the detected air flow inside the capillary metal tubes.

2. The powder-bottom-injecting converter according to claim 1 , wherein an upper end surface of each of the bottom purging/powder injection bricks is higher than the first converter bottom by 50-100 mm.

3. The powder-bottom-injecting converter according to claim 1 , wherein an inner diameter D of the powder transport pipe is 10-30 mm.

4. The powder-bottom-injecting converter according to claim 1 , wherein each of the plurality of the independently removable converter bottoms further comprises a second group of the purging base bricks, wherein each of the purging base bricks in the second group comprises a through hole, and a plurality of bottom purging/powder injection bricks each installed in a corresponding through hole;
when the erosion warning signal in the first group of the purging base bricks is issued, the first group of the purging base bricks switches to the second group of the purging base bricks.

Assignees

• Univ Beijing Science & Technology
• Univ Soochow

Inventors

• Zhu Rong
• Hu Shaoyan
• Dong Kai
• Su Rongfang
• Li Weifeng

Classifications

• F27D2003/164

  Oxygen · CPC title

• C21C5/48

  Bottoms or tuyéres of converters · CPC title

• F27D3/18

  Charging particulate material using a fluid carrier · CPC title

• C21C5/34 Primary

  Blowing through the bath (C21C5/35 takes precedence) · CPC title

• C21C5/30

  Regulating or controlling the blowing · CPC title