SU962320A1 - Blast furnace bottom well - Google Patents

Description

(54) 1WEAR DOMAIN FURNACE

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The invention relates to ferrous metal, hyi, in particular to the construction of blast furnaces, and may be. used in the construction or modernization of blast furnaces.

Closest to the proposed by the Technical essence and the achieved effect is the blast furnace bed, which includes a casing, vertical plate refrigerators and a podschaladnogo cooling system, while the gap between the casing and refrigerators is filled with bulk material 11.

A disadvantage of the known blast furnace design is the limited durability of its lining, as well as the increased danger of breakthroughs of cast iron, which is associated with the intensive destruction of the lining containing carbon with water vapor. The source of water vapor is moisture from the burning of the tuyeres, tuyere appliances, refrigerators, as well as moisture contained in the solution pumped between the casing and the coolers. Moisture diffuses inside and between the blocks. When water is filtered into the working space, it heats up, evaporates, and at a temperature of more than 500 C, it reacts with the carbon of the lining, causing the formation of pores and cavities. Formed pores and cavities reduce the thermal conductivity of the lining and are the cause of intense destruction.

The purpose of the invention is to remove the gaseous reactants from the gap of the cooler case and thereby increase the stability of the bottom.

The goal has been achieved by the fact that in the base of the blast furnace, including the casing, vertical plate refrigerators, the refractory lining of the walls and the bottom, and the system to be cooled, the gap between the casing and the cooler is filled

15 granular material, in the gap between the refrigerator and the casing, perforated pipes are installed.

The drawing shows the proposed construction of a blast furnace bed, a general view.

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Claims (1)

The bream consists of lining 1 formed of carbon-containing materials and other refractories, vertical water-cooled refrigerators 2, and a system of pleschadnogo cooling and limited to a metal casing 4, In the gap 5 between the vertical water-cooled refrigerators 2 and metal. a casing 4 on the periphery of the base of the vertical installed perforated pipes 6, connected to the gas outlet 7 for the output of gaseous oxides. The gap 5 between the vertical water-cooled refrigerators 2, perforated pipes 6 and the metal casing 4 is filled with loose material, such as gravel. The proposed blast furnace bed works in the following way. Since the pressure in the gas outlet 7 is lower than the pressure in the lining 1, due to the vertical perforated pipes 6 in the gap 5, a reduced pressure is created. The moisture entering the liner 1 is evaporated and in the form of water vapor under the action of a pressure difference passes between the vertical water-cooled refrigerators 2, the gap 5 and enters the perforated pipe 6, from where it is discharged into the gas outlet 7. At the same time as the water vapor is removed and other gaseous oxides and gases. A change in the contour of the movement of gaseous oxides and first of all water vapor sharply reduces the carbon oxidation of the lining, which preserves its strength and thermal conductivity and, as a result, leads to an increase in the durability of the lining of the furnace. Due to filling up the gap 5 with loose material, such as gravel, slag, fine-grained fireclay, etc., concentrated concentrated flows of gaseous oxides are eliminated and a portion of the radial load is transferred to the metal casing 4. horizontal perforated pipes, which are pushed into the blocks at 200250 mm from the surface of the plate coolers 2, facing the blocks. The optimal number of perforated pipes (p) for the withdrawal of gaseous oxides is determined depending on the height (H) and diameter (D) of the bottom according to the formula p 3.14 D / H. With a larger number of pipes with unchanged device efficiency, installation becomes more complicated and the metal casing is weakened. With a smaller number of pipes, efficiency is not achieved and local breakthroughs of gaseous oxides into the forge are possible. Simplification of the design of the blast furnace floor can be carried out by connecting the perforated pipes 6 to the collecting manifold, which is located gap, followed by connecting it to the gas outlet 7 by means of an outlet pipe. The cross-sectional areas of the collector and the outlet pipe must be equal to the sum of the cross-sectional areas of the perforated pipes 6, since this ensures the minimum hydraulic resistance of the system. A shut-off device is installed to regulate the pressure drop across the discharge pipe. The application of the present invention will increase the resistance of the blade and extend the campaign period by 10 months. Claims of the invention Blast furnace blast containing a casing, vertical slab refrigerators, a refractory lining of the walls and the bottom, and a subspecific cooling system, wherein the gap between the casing and the refrigerators. filled with bulk material, characterized in that, in order to remove the gaseous reagents from the gap of the cooler cover and increase the stability of the floor, it is equipped with perforated pipes installed in the gap between the cooler and the jacket, with a gas outlet. Information sources. taken into account during the examination 1. AM Borodulin and others. - Steel, 1972, No. 12, p. 1073-1077.