Equipment and method for rapid repair of refractory brick falling off in premixed room of hot air duct

Abstract

The invention belongs to the technical field of metallurgical equipment and particularly relates to quick fixing equipment and a quick fixing method for fall-off of refractory bricks of a warm-air pipe premixer, which are applicable to quick fixing of fall-off and breakage of brick bodies under working conditions such as thermal shock, and the like, of refractory bricks inside a shaft type pipeline of the warm-air pipe premixer of a blast furnace. Arc-shaped steel plates are welded one by one to form an inner mould, wherein a vertical-section welding plate and a horizontal-section welding plate on the inner mould are respectively welded with a vertical-section opening and a horizontal-section opening of a warm-air pipe; after the inner mould is welded, the horizontal-section welding plate and a housing supporting mould are welded together, so that construction difficulty is greatly lowered, fixing construction period is greatly shortened to 3-4 days, and therefore, furnace shutdown is shortened and cost is lowered. Rivets which are Y-shaped are arranged in the housing supporting mould, wherein the opening angle is 120 degrees. The plurality of rivets which are arranged in the shape of Chinese character tian are arranged inside the housing supporting mould. The rivets can fix pouring materials more firmly, so that the pouring materials are firm and wearable after being condensed and formed, and therefore, service life of the metallurgical equipment is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment, in particular to a rapid repair device and method for refractory bricks falling off in a premixed chamber of a hot blast pipeline, which is suitable for masonry of refractory bricks inside a shaft-type pipeline in a premixed chamber of a blast furnace hot blast pipeline under thermal shock and other working conditions Quick repair of peeling, broken. Background technique [0002] As we all know, the blast furnace hot air pipeline for ironmaking blast furnace transports the hot air heated by the hot blast furnace, that is, hot air. Above 1250°C, the pressure is in the range of 0.3-0.4MPa. In order to achieve the above purpose, the hot blast stove has been improved in various aspects such as the furnace firing process and the hot blast stove structure configuration, but the piping system for conveying hot air has not been substantially improved, and the traditional hot air piping h...

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Problems solved by technology

In order to achieve the above purpose, the hot blast stove has been improved in various aspects such as the furnace firing process and the hot blast stove structure configuration, but the piping system for conveying hot air has not been substantially improved, and the traditional hot air piping has been used. The cracking and falling off of the refractory masonry inside the pipeline will cause the phenomenon of redness of the pipeline shell, and in severe cases, it will also cause burn-through accidents

[0003] At present, the repair of hot air pipelines mostly adopts methods such as grouting, shell cutting and plastering, and external water cooling. The grouting method cannot completely fill the cracks or defects of refractory masonry at high temperature points. At the same time, it caused serious blockage and the entire hot air pipeline was scrapped; the shell was cut and smeared with mud, and the repair area was large, which required a lot of manpower and required shutdown for maintenance for 20-30 days. All high-temperature-resistant materials were removed and then re-built. The maintenance cycle was long and costly. high

The external water cooling method can not completely cover the reddened area, but can only partially relieve the reddened phenomenon, and cannot fundamentally solve the problem. At the same time, the cooling water consumption is large, and a large amount of hot steam will be generated, which poses a certain safety hazard

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