SU1694650A1 - Blast-furnace bottom - Google Patents

Abstract

This invention relates to ferrous metallurgy, in particular to the structure of the blast furnace floor. The purpose of the invention is the elimination of the destruction of the bottom of the basement from temperature stresses resulting from sharp fluctuations in the temperatures of the atmospheric air during the cold and transitional periods of the year. The purpose of the invention is achieved by forming an annular shell around the bottom of the casing, forming a channel between it and the bottom casing, the bottom of this channel is formed by double annular air ducts with perforated upper walls connected respectively to pressure and prefabricated collectors. The application of the invention allows to increase the durability of the casing by 10% and increase the turnaround time of the blast furnace. 1 hp f-ly.

Description

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The invention relates to ferrous metallurgy, in particular to the structure of the field of the blast furnace.

The purpose of the invention is the elimination of the destruction of the bottom of the basement from temperature stresses resulting from sharp fluctuations in the temperatures of the atmospheric air during the cold and transitional periods of the year.

FIG. 1 shows a blast furnace; vertical section; figure 2 - section A-Anafig.1.

The blast of a blast furnace consists of a foundation 1, on which a highly heat-conducting refractory layer 2 is located, inside which air-cooled pipes 3 are laid, combined by pressure 4 and waste 5 collecting manifolds. The refractory layer 2 is supported by a metal bottom 6 welded to the front part of the casing 7, inside of which the refractory lining 8 is located. to the casing 7. The upper edge of the annular screen is separated from the plane of the upper working platform at a distance of at least 1.0 m. Screen 9 and casing 7 form a continuous annular channel 11. open at the top. The exit from the channel is provided with a cylindrical shell 12, installed relative to the screen 9 with a gap of two widths of channel 11. The upper end of the gate is adjacent to the working platform, the lower one is below the upper edge of the ring screen 0.9 times the width of the annular channel 11. At the bottom is the annular channel eleven

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connects to semi-circular air ducts 13 and 14. Air ducts 13 are connected to a pressure manifold 4 through pipe 15 with an adjusting flap 16, and air ducts 14 are connected to a waste collector 5 through a pipe 17 with an adjusting flap 18.

Bream blast furnace works as follows.

During blast furnace operation, liquid smelting products are collected in the blast furnace hearth, heating the lining of the bottom 8, Temperature effects on the lining 8 contribute to its expansion. The temperature effect of the lining 8 is transmitted to the supporting metal lug 6 and to the inner surface of the metal casing 7. The metal bottom 6 supported on the highly heat-resistant refractory layer 2 is cooled by air which flows from the pressure manifold 4 into the pipes 3 and further into the waste manifold 5. MOV by piping 3, the air is heated.

Elimination of the dependence of heat fluxes on abrupt changes in the outside air temperature and, therefore, stabilization of the temperature deformations of the casing 7, preventing its destruction, is achieved by forming around the casing 7 a thermostatically controlled air space bounded by the casing 7 and the annular screen 9. Air is supplied to this space through the air ducts 13 and 14. Through the perforations in the upper walls of the ducts 13 into the channel 11 cold air is supplied from the pressure collector 4. Through the perforations in the walls of the ducts 14 into the canal Al 11 enters the heated air from the waste manifold. The temperature in the duct 11 is controlled by adjusting the flow rates of the cold and heated air with the help of the appropriate adjusting flaps 16 and 18.

In order to ensure optimum hydraulic resistance to the air exit from the channel 11, the upper edge of the screen 9 is spaced from the upper working platform to the width of the channel 11.

A steady and uniform filling of the volume of the annular channel 11 with the air of a standing temperature is achieved by fencing the open part of the channel 11 from unorganized air flows with a special cylindrical shell 12, the dimensions of which are determined by analogy with

air vents used in ventilation systems.

The present invention makes it possible to increase the durability of the casing by 10%, which increases the turnaround time of a blast furnace and its overall service life.

Claims (2)

1. Blast of a blast furnace containing a foundation, metal bottom, casing with a working platform, an annular metal shell, a refractory lining, air-cooled pipes connected to pressure and waste prefabricated headers, characterized in that. what with the purpose eliminating the destruction of the bottom of the thermal stresses, it is equipped with dual annular air ducts with perforated upper walls at the same level, forming the bottom of a continuous annular channel between the casing and the annular metal shell and attached respectively to the pressure and discharge prefabricated collectors, and the upper edge of the annular shell from the working platform at a distance equal to the width of the annular channel. 2. A crate according to claim 1, characterized in that, in order to ensure a stable uniform filling of the annular channel with air coming from the air ducts, it is provided with an annular catfish steel sheet installed with a gap relative to the annular shell, while the upper edge of the annular sa adjacent to the lower surface of the working platform, and the lower is located below the upper edge of the annular shell. WOMAN'S WOOL HEAT 12 Aa 13 /four No