SU900092A1

SU900092A1 - Arc furnace roof

Info

Publication number: SU900092A1
Application number: SU802974569A
Authority: SU
Inventors: Юрий Константинович Малышкин; Николай Андреевич Клепиков
Original assignee: Восточный Научно-Исследовательский И Проектный Институт Огнеупорной Промышленности (Востио)
Priority date: 1980-06-06
Filing date: 1980-06-06
Publication date: 1982-01-23

Description

(54) СВОД ДУГОВОЙ ПЕЧИ(54) ARC COVER

1one

Изобретение относитс к металлур гической промышленности и может быть использовано в конструкции дуговьгх печей.The invention relates to the metallurgical industry and can be used in the construction of arc furnaces.

Известен свод дуговой печи, включающий свободное кольцо и секторноарочную кладку 1.The arch of the arc furnace is known, which includes a free ring and sector-laying masonry 1.

Недостатком этой конструкции вл етс невысока стойкость свода, обусловленна неравномерным распределением напр жений в кладке и св занной с этим различной скоростью износа изделий, а также отсутствие возможности эффективного проведени ремонта всей, наиболее изнашиваемой кладки центральной части.The disadvantage of this design is the low resistance of the arch, due to the uneven distribution of stresses in the masonry and the associated different wear rate of the products, as well as the inability to effectively repair all the most wear masonry of the central part.

Наиболее близким к предлагаемому по технической сущности и достигаемому эффекту вл етс свод дуговой печи, включаюпщй сводовое кольцо, .кольцевую кладку периферийной части, секторно-арочную кладку центральной части, газоотсосное и электродные отверсти 2.The closest to the proposed technical essence and the achieved effect is the arch of the arc furnace, including the vault ring, the ring laying of the peripheral part, the sector-arched laying of the central part, the gas suction unit and the electrode holes 2.

Недостатком конструкции свода вл етс низка стойкость участка кладки центральной части, расположенного между газоотсосным и наход щимс с ним на одной оси ближайшим электродным отверстием, вли юща на стойкость всей центральной части. Пониженна стойкость этого участка кладки обусловлена особенност ми его службы: одновременным A disadvantage of the design of the roof is the low resistance of the section of the masonry of the central part located between the gas suction and the nearest electrode hole located on the same axis, which affects the resistance of the entire central part. The reduced resistance of this section of the masonry is due to the characteristics of its service: simultaneous

10 воздействием более высоких температур (электрод), повышенного истирани и повышенного количества реагентов плавки (работа газоотсоса).10 by exposure to higher temperatures (electrode), increased abrasion and increased amount of melting agents (gas suction operation).

Цель изобретени - увеличение 15 стойкости центральной части свода.The purpose of the invention is to increase the 15 resistance of the central part of the arch.

Claims

The goal is achieved by the fact that in the arch of the arc furnace, which includes the arbor ring, the annular masonry of the peripheral part, the sector 20 but the arched masonry of the central part, the gas suction and electrode holes, made in the form of a sector adjacent to the masonry of the peripheral part and formed of annular rows, whose length is limited to a central angle of 30-90 °, with the last circular row of the sector in The wall of the electrode hole. Performing a sector from annular rows of products allows to increase the building strength and durability of the central part of the roof, firstly, by eliminating the circumference and fitting the products adjacent to the last, annular row of the peripheral part, which took place when the central part was performed in a sectoral oriental way. secondly, due to the creation of significant expansion efforts in the annular rows of the sector, including in the last annular row, serving as the wall of the electrode hole Limiting the extension of the annular rows to the sector The central angle, equal to 30, is caused by the minimum necessary dshshnaya last kotsevogo row, which is the wall of the elec- trode screwdriver. The upper limit of the extension, equal to 90 °, is due to the necessity of obtaining sufficient, accurate building strength at the corners of the sector-arching of this electrode hole. On (|) game. The structure of the arch in FIG. 2 shows section A-A in FIG. 1. The ring masonry of the peripheral part 1 and the sector arched masonry of the central part 2 are made in the arched ring 3. In the masonry of the peripheral part 1 there is a gas suction opening 4, and in the masonry of the central part 2 there are electrode holes 5. The part of the masonry of the central part 2 located between the suction hole 4 and the electrode hole 5 which is located on the same axis, it is made in the form of sector b, which joins the peripheral part 1 and consists of annular rows of products. The last circular row of sector 6 is the wall of the electrode hole 5. The length of the circular rows in sector 6 is limited to a central angle of 30-90. In making the arch, the arch ring 3 is installed on the template and the annular masonry of the peripheral part 1 and the gas suction hole 4 are laid. After this, the central part 2 is laid, for which the central arch and the cross are laid out first and then separate areas in the area of each electrode holes 5. When laying the area in the region of the electrode hole 5 coaxially with the gas suction hole 4, first spread the corners evenly, and then the first ring row of sector 6 immediately adjacent to The next annular row of the peripheral part 1. After that, one row of bricks is laid out in each corner and the next annular row of sector 6 is performed, etc., until the last annular row is the wall of the electrode openings 5. The length of annular rows in sector 6 is limited to a central angle of c equal to 30-90. In the case of a dome of a 100-ton electric arc furnace, the peripheral part of which is laid out of 12 ring rows of products installed relative to a roof ring on an edge, the sector will consist of 3-4 ring rows installed on the edge of products. The proposed design of the vault, which involves the implementation of a masonry between the suction and the electrode hole coaxial with it in the sector-arched central part in the form of a sector formed by annular rows of products, will significantly increase the structural strength and durability of this section of the masonry, which will entail an increase in durability central part of the arch. As a result of the use of this arch design on 100-ton electric furnaces, the arch resistance is expected to increase by 15-20% compared to the existing one, which will reduce the consumption of arch refractories by 15%, reduce furnace stoppages and thereby obtain an annual economic effect on one electric furnace. 20 thousand rubles. The formula of the invention The arch of the arc furnace, including the arch ring, perimeter wall laying