SU996818A2

SU996818A2 - Arc melting furnace

Info

Publication number: SU996818A2
Application number: SU813335820A
Authority: SU
Inventors: Олег Михайлович Сосонкин
Original assignee: Московский вечерний металлургический институт
Priority date: 1981-09-07
Filing date: 1981-09-07
Publication date: 1983-02-15

Description

а 5 4) ДУГОВАЯ ПЛАВИЛЬНАЯ ПЕЧЬa 5 4) ARC MELTING FURNACE

Изобретение относитс к производству метсшлов и сплавов и может быть использовано в электродуговых сталеплавильных печах.The invention relates to the production of trades and alloys and can be used in electric arc steelmaking furnaces.

Известна конструкци электройуговой печи с переменной степенью развити кладки 1}.The known design of an electric arc furnace with a variable degree of development of masonry is 1}.

В этой конструкции при изменении степени развити кладки в сторону уменьшени от существующих значений увеличиваютс тепловые нагрузки на все злементьт кладки печи и ванну. Оптимизаци условий теплопередачи к ванне может быть достигнута за счет снижени стойкости стен.In this design, as the degree of development of the masonry changes in the direction of decreasing from the existing values, the thermal loads on all elements of the furnace masonry and bath increase. Optimization of heat transfer conditions to the bath can be achieved by reducing the resistance of the walls.

Известна конструкци электродуговой печи с переменной геометрией рабочего пространства, в которой стойкость нижней части стен обеспечиваетс за счет искусственного охлаждени 2.The known design of an electric arc furnace with a variable geometry of the working space, in which the resistance of the lower part of the walls is provided by artificial cooling 2.

Однако применение охлаждени стен св зано с увеличением энергетических затрат на выплавку стали.However, the use of wall cooling is associated with an increase in the energy cost of steelmaking.

Основным преимуществом печи с переменной степенью развити кладки, следует считать возможность завалки всей массы шихты за один прием за счет увеличени высоты стен печи. При такой конструкции исключаютс The main advantage of a furnace with a variable degree of masonry development should be the possibility of filling the entire mass of the charge in a single step by increasing the height of the furnace walls. With this design excluded

подвалки шихты, что позвол ет сокра-, тить продолжительность плавки и удельный расход электроэнергии,- Однако увеличение высоты стен требует подъема загрузочной бадьи, а, следовательно , и подкрановых путей.basements of the charge, which allows to shorten and melt the duration of melting and specific energy consumption. However, increasing the height of the walls requires raising the loading bucket, and, consequently, the crane runways.

По основному авт. св. № 410104 известна конструкци электродуговой печи, в которой нижн часть стен According to the main author. St. No. 410104 is known for the design of an electric arc furnace, in which the lower part of the walls

10 выполнена охлаждаемой .Сз.10 is made cooled.

Такое решение позвол ет добитьс высокой стойкости, однако .при этом энергетические затраты на выплавку стали оказываютс также высокими,так Such a solution makes it possible to achieve high durability, however, while the energy costs for steel production are also high, so

15 как в течение всей плавки от поверхности стен отводитс значительное количество тепла с охлаждающей водой.15 as during the whole melting a significant amount of heat is removed from the surface of the walls with cooling water.

Целью изобретени вл етс увеличение стойкости стен печи и сокраще-. The aim of the invention is to increase the resistance of the walls of the furnace and reduce -.

20 ние энергетических затрат.20 energy costs.

Поставленна цель достигаетс тем, что дугова плавильна печь с переменной геометрией рабочего пространства , содержаща футеровку подины, ; The goal is achieved by the fact that an arc melting furnace with a variable geometry of the working space, comprising a bottom lining,;

Claims

25 water-borne walls and a water-cooled movable roof with a circumferentially elastic cuff with lamellar springs embedded in it, is equipped with a cooled cylinder insert located in the annular space between the roof and the wall and vertically displaceable. FIG. 1 schematically shows the proposed p. B, longitudinal section in FIG. 2 - the same view with an insert in the highest position; in fig. 3 - the same, with the position of the insert | after the furnace is loaded; Fig. 4 - the same, view from the position of the insert after melting of the part, filling 5 in Fig. 5 - the same, view from the position of the insert after the period of melting in the lowest position. The furnace contains water-cooled cable 1, imh (the outer diameter is less than the internal diameter of the furnace walls, and a cylindrical annular cooled step: in 2, located in the gap between the roof 1 and 3. The furnace. Before filling the charge, cycle 1 and insert 2 are raised to the outermost position (Fig. 2), and produces with the filling of the entire mass of the charge. In this case, the level of the furnace is higher than the level of the furnace walls 3. After the filling, the insert 2 is lowered (Fig. 3), and the furnace is turned on and melted. the arc ignites above the charge, melting takes place closed arc, wall 3, insert 2 and roof 1 do not participate in heat exchange processes, and their influence on the amount of energy costs for steel production is negligible. As 1 mixture is melted down and its walls 3 are lowered, it becomes possible to lower roof 1 of furnace 1 4) and the most melting of the charge at this position of the arch. At the end of the melting period, when there is, a bath of molten metal, but not all of the charge of expanded: avlena, usually has to be reduced when entering the MortiHocTb furnace so as to: 1: L save the walls, i.e. maintain the resistance of the furnace by reducing its performance. 13 of the proposed design, at the end of the melting period, the insert 2 is lowered to the lowest position (Fig. 5) and the melting is carried out at the maximum input power. After the charge is melted when oxygen is used extensively to blow the bath, the thermal load on the furnace masonry is reduced due to BL-cracking a large amount of melting dust, which increases the optical density of the furnace atmosphere. The heat loads from the arc onto the stove laying are reduced. In order to reduce the heat losses, the insert being cooled rises up (Fig. 4). During the recovery period of melting, when the furnace atmosphere is radiolucent, and the working space temperature reaches maximum values, the insert is lowered again to prevent the lower part of the wall masonry from overheating. is 0.25 rub. per ton of steel. The presence of a cylindrical cooling insert in the proposed arc melting furnace design allows changing the volume of the working space and protecting the laying of the lower wall after melting the charge Compared with the electric arc furnace selected as the base, with a filling in two steps (60-70% total weight of the charge in the filling and 30-40% in the basement), the proposed design eliminates the charge of the basement, which leads to a reduction in specific electricity consumption by 4%, the expected increase in resistance of the walls, compared to the base om, should offset the cost of reconstruction of the existing furnace. With an average specific energy consumption of 600 kWh / t and a cost of 10 rubles / 1000 kWh, the economic effect will be about 0.25 rubles / ton of steel. Claims of arc arc melting furnace according to ant.ev, (410104, characterized in that, in order to increase the durability of the furnace walls and reduce energy costs, the furnace is equipped with a cooled cylindrical insert located in the annular gap between the roof and the walls and designed to movements along the verti- calium. Information sources taken into account in the examination 1, USSR Author's Certificate No. 287238, class F 27 B 3/08, 1970. 2, USSR Author's Certificate No. 777378, class, F 27 B 1 / 08, 1980. 3, USSR Copyright Certificate tt 410104, class C 21 C 5/52, 1974.