SU985038A2 - Blast furnace main spout - Google Patents

Description

one . The invention relates to ferrous metallurgy, namely to devices for separating molten iron from slag. According to the main author. St. No. 865910, the main chute is known, which contains a lined casing, a main skimmer slab, a slag and an additional skimmer slab, with the additional skimmer slab attached to the wall of the Slag chute, at the point of its conjugation with the main chute at an acute angle has a length equal to 0.2 width the main gutter canal along its upper section, the lower section of the additional skimmer plate being located at a distance of 0.2-0.5 of the channel height, and the upper section being at the level of the upper section of the main chute 1 3. Attributes of the known main chute of a blast furnace should be attributed not to a high degree of separation of pig iron from slag due to the fact that installing an additional skimmer at an arbitrary angle to the longitudinal axis of the main shaft does not allow for maximum separation of iron from slag and leads to loss of iron with slag up to 3, 0 I. The purpose of the invention is to increase the degree of separation of pig iron from slag and reduce the loss of cast iron with slag on the outlets. . The goal is achieved by the fact that, in the main chute of the blast furnace, the additional -CFfilWMePHafl Plat is angled at an angle of 30-80. Installing an additional slab at an angle of less than 30 leads to an increase in losses of cast iron with slag due to a decrease in the degree of impact of the skimmer plate on the flow of cast iron VI. At around 80 °, a splash occurs in the place of articulation of an additional skimmer plate with a gutter, of pig iron and slag through the top of the gutter onto the working platform, as a result of which the total loss of cast iron also increases dramatically. In addition, labor costs are required to clean cast iron from the working site. The drawing shows the main chute, top view. The main trough 1 includes an adjoining slag trough 2, the main skimmer plate 3, a cast-iron pass and an additional skimmer plate 5f having a length equal to 0.2-0.7 the width of the channel of the main groove along its upper cut. The lower cut of the additional skimmer plate 5 is located at a distance of 0.2-0.5 from the channel height of the channel, and the upper cut is at the level of the upper cut of the main groove. An additional skimmer plate is located at an angle of 50 to the vertical plane through the longitudinal axis of the main trough. The indicated main trough was tested on a blast furnace with a volume of 2,700 m. Additional skimmer plates with a length of 0.2 and 0.7 times the width of the main trough channel were tested, which are the boundary values of the optimal skimmer lengths. slabs. The bottom cut of the plates is set at a distance of 0.2 and 0.5 of the channel height, i.e. Also, the boundary optimal values of the installation of the plates in height are checked. Hugo / 1 installation of plates - in relation to the vertical plane, carried out through the longitudinal axis of the main trough, is changed from 10 to 100. The obtained characteristics of the main trough operation are tabulated. As can be seen from the table, at the angles between the additional skimmer plate and the vertical plane, conducted through the longitudinal axis of the main trough, less than 30 °, the loss of cast iron with slag increases. This is due to the fact that the installation of the slab does not provide the necessary degree of constriction and circulation of the iron and slag PTotoKOB, as a result of which the efficiency of the separation of the iron from the slag is reduced. At angles of large VO in the region of the skimmer plate, there is a sharp decrease in the flow velocity and their passage into the free section of the gall is difficult because of the need to change the flow of fluxes through a large angle. This leads to the overflow of part of the iron and slag through the top of the chute to the working platform, i.e. there are also increased losses of iron. The best indicators were obtained at angles between the additional skimmer plate and the vertical plane, carried out through the longitudinal axis of the main trough, equal to 30-86 °. Loss of cast iron with slag in this case is reduced by 31.2 rel. in comparison with smaller angles of installation of a plate And —on rel. compared to large angles. PRI me R. On a blast furnace with a capacity of 2,700 m, an additional skimmer plate with a length of 0.5 the width of the channel of the main groove is installed, the distance of the lower edge of the slab from the surface of the groove is 0.3 channel height. The angle between the slab and the vertical plane drawn through the longitudinal axis of the main trough is 50®. With the release of products from the blast furnace smelting in the space between the cut plate and the opposite wall of the gutter is a narrow flow of iron and slag, their speed increases. Since these streams enter the space bounded by the walls of the gutter, the main and additional skimmer plates, along tangential and faster speeds, these streams intensively circulate, which leads to an effective separation of iron and slag. The main main trough has been operating on the blast furnace for two months. At the same time, losses of pig iron with slag averaged 2. The operation of the chute with optimal installation angles of the additional skimmer plate ensured a reduction in the loss of Oj5 cast iron in comparison with the chute when the installation angle of the additional skimmer plate was not regulated. The economic effect from the introduction of the proposed additional skimmer on a blast furnace with a volume of 268 thousand rubles.

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Claims (1)

I) X Formula of the Invention The main blast furnace chute according to ed. St. W 865910, characterized in that, with the aim of increasing the degree of separation of pig iron from slag and reducing the loss of iron with /: 9 / / 850388 slag, additional skimmer plate is angled. Sources of information taken into account during the examination 1. USSR author's certificate N 865910 per H application N 2898586 / 22-02, cl. From 21 to 7/14, 1979.