Method for prolonging service life of furnace hearth and furnace bottom of blast furnace

Abstract

The invention relates to the technical field of long service life of a blast furnace, in particular to a method for prolonging the service life of a furnace hearth and a furnace bottom of the blast furnace. The method is characterized by comprising the following steps of: improving the structure and the installation form of a cooling wall of the furnace hearth, arranging a water retaining device at the cooling wall of a tuyere zone and coating channel bricks at an iron notch zone, wherein in installation of the cooling wall of the furnace hearth, the cooling wall is tightly contacted with a furnace shell; a high-temperature-resistant resin sealant is coated between the cooling wall and the furnace shell, and is used for blocking water generated by leakage of the cooling wall from flowing towards the furnace hearth and the iron notch zone; baffle plates are respectively arranged above and below the cooling wall of the tuyere zone, so that the occurrence of the conditions of leaked-water scouring and gas blowby of the cooling wall are avoided; and steel-plate coating bodies are arranged at the peripheries of the channel bricks of the iron notch zone. Compared with the prior art, the method has the beneficial effects that the water generated by damage and leakage of cooling equipment is prevented from entering carbon bricks of the furnace bottom and the furnace hearth, and an enrichment channel with harmful elements formed by gas blowby at the iron notch is blocked, so that the corrosion process of carbon bricks of a furnace lining is slowed, and the service life of the blast furnace is prolonged.

Description

technical field [0001] The invention relates to the technical field of blast furnace longevity, in particular to a method for prolonging the service life of a hearth and bottom of a blast furnace. Background technique [0002] In recent years, many hearth burn-through accidents have occurred in many large blast furnaces in China. These blast furnaces have also adopted longevity comprehensive technology, but the effect is not satisfactory. A few blast furnaces have hearth burn-through accidents within three years of commissioning. The industry generally believes that insufficient cooling capacity is the main reason, but after the enhanced cooling of large blast furnaces, some new problems cannot be ignored. For example: there is a gap on the back of the traditional stave, which is easy to blow gas and water seepage to the hearth area, the alkali metal and zinc cycle enrichment deteriorates the performance of carbon bricks, the leakage of cooling equipment and the gasification...

AI Technical Summary

Problems solved by technology

[0002] In recent years, there have been many hearth burn-through accidents in many large blast furnaces in China. These blast furnaces have also adopted longevity comprehensive technology, but the effect is not ideal. Some blast furnaces have hearth burn-through accidents within three years of commissioning

The industry generally believes that insufficient cooling capacity is the main reason, but after the enhanced cooling of large blast furnaces, some new problems cannot be ignored

For example: there is a gap on the back of the traditional stave, which is easy to blow gas and water seepage to the hear

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