Stress release type refractory lining body for smelting area of steel-making converter and building method thereof

Abstract

The invention relates to a stress release type refractory lining body for a smelting area of a steel-making converter. The stress release type refractory lining body comprises a furnace lining working layer and a furnace lining permanent layer in a furnace shell, the furnace lining working layer is composed of an annular structure formed by sequentially arranging a first arc area masonry, a parallel area masonry and a tail arc area masonry, and the furnace lining working layer is positioned between a furnace bottom annular brick layer and a furnace body annular brick layer for smooth cambered surface transition connection; and the masonry in each area is formed by high-temperature refractory bricks with completely same longitudinal sections in a surface-surface seamless fitting manner, and stress absorption buffer layers are arranged in middle layers of the first arc area masonry and the tail arc area masonry. According to the refractory lining body, the innovative structure that turning of a masonry surface is realized by a double-arc masonry body and transition between two arcs is realized by a parallel masonry surface is adopted, the middle layers of the arc masonry bodies are respectively set as the stress absorption buffer layers, therefore, the structure can maximally guide thermal expansion of the whole converter lining to a furnace mouth sealing material layer without dead angles, and stress release of the converter lining body in a thermal state is realized to the greatest extent.

Description

technical field [0001] The invention relates to a stress release type steelmaking converter smelting area refractory lining and a masonry method thereof, belonging to the technical field of refractory materials for steelmaking furnaces. Background technique [0002] Due to the advantages of high productivity, good smelting quality, low construction costs, labor saving, easy flue gas dust removal, and low consumption of refractory materials, converter steelmaking has developed into the mainstream steelmaking method today. Especially in my country, according to the statistics of relevant departments, converter steel accounts for more than 80% of the country's total crude steel output in recent years. It can be seen that the development of new technologies for refractory materials for converters and the improvement of the service life of their linings have an important role in promoting the healthy development of my country's iron and steel industry in a green, emission-reducin...

AI Technical Summary

Problems solved by technology

[0005] (1) Before laying the bottom turning bricks, the elevation, positioning and leveling will increase the difficulty of masonry. In addition, once the bottom turning bricks are built and leveled improperly, it will directly affect the masonry quality of the entire converter lining ;

[0006] (2) Increased production costs for refractory manufacturers

In the lining structure of the traditional smelting area, the turning bricks built against the end ring brick layer of the spherical furnace bottom usually consist of 3 to 5 layers, and are just located in the triangular turning area between the converter hearth shell and the lower cone shell. , it can be seen that the length of the brick gradually increases from bottom to top. In addition, the length of turning bricks varies greatly between different converters. Therefore, the use of traditional turning brick structure design will greatly reduce the common rate of brick types, which brings great benefits to refractory manufacturers. To greater pressure on mold management and cost;

[0007] (3) Due to the inevitable dimensional errors in the process of brick production and masonry, under the premise of ensuring the levelness of the masonry surface, it is often caused that the beveled surface of the turning brick and the outer surface of the end ring brick of the furnace bottom are attached The lack of strictness not only affects the sealing of the masonry, there is a risk of "steel piercing and steel leakage" during smelting, but also forms a "line-surface connection" structure between the two that is prone to thermal stress concentration, causing the refractory lining in the smelting area to be damaged. The body is damaged too quickly, which reduces the overall service life of the furnace lining;

[0008] (4) Turning bricks are enclosed in the triangular area between furnace bottom bricks, molten pool bricks, and furnace shells. The expansion effects of each part during the heating process are not synchronized, and conflict and limit each other, resulting in easy contact between each part. The problem of thermal stress concentration

[0009] In the increasingly harsh smelting environment, the above-mentioned shortcomings of the traditional masonry structure are becoming increasingly prominent, especially as explained in (3) and (4), due to thermal stress concentration, "natural" brick cracks and other reasons have occurred in practical applications The phenomenon of "deep pit at the bottom corner" and "too fast erosion in the smelting area" that seriously affect the safe production and overall life of the converter have been eliminated

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