Green ceramic tuyere small sleeve for blast furnace

Abstract

The invention relates to a high-performance ceramic tuyere small sleeve, which has no melting loss by high-temperature liquid-state iron slag or cannot be worn by high-speed pulverized coal particles, and cannot be cracked by increased local thermal stress; copper material can be replaced; if the ceramic tuyere small sleeve adopts cooling water as medium, the quantity of the cooling water is only a small fraction of that of the existing tuyere small sleeve. A tuyere small sleeve framework is sealed with a tuyere middle sleeve and a blow pipe and supports a tuyere small sleeve barrel body, less mediums are introduced into the tuyere small sleeve framework for cooling; an anchored pile is arranged on the tuyere small sleeve framework, and steel wires are attached to form an anchoring net; and high-performance ceramic material is coated outside the tuyere small sleeve framework to form a ceramic barrel body. The ceramic material has a good high-temperature mechanical property, so as to meet the refractoriness under load under a using condition and high-temperature liquid-state iron slag melting loss resisting property. An outer sleeve of the tuyere small sleeve, which has high strength and good impact toughness, is embedded or bonded outside the ceramic barrel body to prevent the tuyere small sleeve from the damages caused by impacting during installation, and isolate iron slag and high-temperature air flows from contacting the ceramic barrel body within a period of time after blowing-in of the blast furnace.

Description

Technical field: [0001] The invention belongs to the technical field of blast furnace ironmaking. Background technique: [0002] The working environment of the tuyere casing is the worst area in the blast furnace. Most of the widely used tuyere casings are made of copper materials directly facing the working environment, and the interior is cooled by water to ensure normal operation. This method has obvious defects: 1) it is easy to be melted and damaged by molten iron, and water leaks into the furnace, causing the blast furnace to shut down, interrupting the normal process of the blast furnace, resulting in loss of production and increased consumption; 3) When the local thermal stress is too large, it is easy to produce cracks or cracks; 4) The damage of the tuyeres cannot be detected or replaced in time, and a large amount of cooling water enters the hearth, which will cause the blast furnace cooling accident and make the furnace condition go smoothly Reverse, the loss is...

AI Technical Summary

Problems solved by technology

This method has obvious defects: 1) it is easy to be melted and damaged by molten iron, and water leaks into the furnace, causing the blast furnace to shut down, interrupting the normal process of the blast furnace, resulting in loss of production and increased consumption; 3) When the local thermal stress is too large, it is easy to produce cracks or cracks; 4) The damage of the tuyeres cannot be detected or replaced in time, and a large amount of cooling water enters the hearth, which will cause the blast furnace cooling accident and make the furnace condition go smoothly Reverse, the loss is greater, and it will also accelerate the ablation of the furnace lining; 5) Water cooling consumes both energy and precious water resources, and this defect is more obvious in water-scarce areas; 6) A large amount of cooling water is used at the tuyeres, which reduces the furnace The actual wind temperature level

Most of the inventions or utility model invention patents retrieved about the blast furnace tuyere are coating the surface of the existing tuyere sleeve. This method can only slightly delay the life of the tuyere sleeve, but still cannot solve the fundamental defect of the tuyere sleeve.

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