SU1224528A1 - Water-cooled cover of electric-arc furnace - Google Patents

Description

The invention relates to ferrous metallurgy, and more specifically to the equipment of steel-smelting electric arc furnaces.

The purpose of the invention is to combine in one design the shelter of the furnace bath and devices for the localization of harmful discharges from it, as well as improving the reliability

FIG. 1 shows a water-cooled lid, top view in FIG. 2, section A-A in FIG. 1 in FIG. 3 is a flow chart of furnace gases, aspirated air, compressed air and water to cool the elements of the device.

A water-cooled arc furnace cover consists of a water-cooled cover 1 with holes 2 for the passage of electrodes and a hole 3 for the exit of furnace gases into which a replaceable water-cooling pipe 4 with tubes of compressed air is installed, the housing 5 of the cover of the electrode zone on which the Water-cooled is installed plate 6, collecting duct 7 with detachable connection 8. On the cover body 5 there are channels 9 for intake of outside air in which the adjustment valves 10 are installed, besides, a hole 11 is made in the body, intersecting mine from the inside with a movable arcuate shield 12.

Before entering the collecting duct 7, a pneumatic ejection chamber 13 is installed, and above the holes in the plate 6 there are movable dielectric rings 14. The position of the cover 5 is determined by clamps 15, and the dielectric inserts 16 are installed in the holes 2.

Watercoat rent krška arc furnace works as follows.

The water-cooled lid 1 is installed on the furnace bath, and the gases formed during the metal smelting process are removed through the hole 3, into the shelter equipped with the housing 5 and the water-cooled plate 6, from where through the collecting duct 7 they go through to the stationary gas duct ( not shown). Compressed air is supplied to the gases passing through the opening 3, which provides for regulation

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formation of the gas yield, as well as afterburning of carbon monoxide. Tubes of compressed air are placed in the form of nozzles along the inner wall of the replaceable water-cooled pipe 4. The general flow of gases is controlled by a pneumatic isolator 13. To reduce the temperature of gases in the collecting duct 7, external air is sucked through the channels 9, and its quantity is regulated by valves 10. Besides In addition, the presence of the opening 11 in the housing 5 also allows outside air to be sucked inside the shelter, which makes it possible to reduce the temperature inside it and reduce the vacuum that affects the gas output in through the gaps in the holes 2 for the passage of electrodes. An arc-shaped flap 12 is installed behind the opening 11 so as to direct the air flows along the walls of the housing 5, thereby cooling them. This distribution of air eliminates the frenzy of hot electrode areas due to wind and oxygen exposure. The movable dielectric rings 14 installed on the stove 6 reduce to a required minimum the gap at the point of passage through the stove 6 of the furnace electrodes, which increases the tightness of the cover and prevents npHftue gas emissions from the furnace. Their free installation above the holes 2 is caused by the need to compensate for the movements of the electrodes during operation. The annular dielectric inserts 16 installed in the openings 2 are interchangeable and are designed to thermally and electrically protect the most heated portions of the roof 1. The main streams of furnace gases and air as well as the supply of compressed air and water for cooling are shown by 3 different arrows.

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The application of the invention ensures the compactness of the water-cooled lid, localization of the source of feimo-gaseous and post-combustion carbon monoxide, elimination of overheating of the current-carrying elements of electric holders, improvement of working conditions of the staff.

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Editor L. Veselovska

Compiled by N. Filippov

Tehred N. Bonkalo Proofreader M. Maksimishinets

Order 1909/34 Circulation 561 Subscription.

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and Polygraphic Enterprise, Uzhgorod, st. Project, 4

Claims (2)

1. WATER COOLED COVER OF THE ARC ELECTRIC FURNACE, containing holes for electrodes and furnace gases, dielectric seals, a gas collection cover, ducts, pipelines for supplying compressed air and water for cooling, characterized in that, in order to combine in one design the shelter of the furnace bath and the device for localizing harmful emissions from it, a removable annular branch pipe with elements for regulating their amount and afterburning carbon monoxide in them by supplying compressed air, and above it with openings for the electrodes, a common gas-collecting shelter was made, which had air intake channels on both sides for cooling gases and the walls of the shelter, with control valves installed at their inputs, and in the shelter body there was an opening for air intake into its inner part, behind which an arcuate shield was mounted protecting electrodes from direct exposure to atmospheric oxygen. 2. The cover according to π. 1, with the aim that, in order to increase reliability in operation, the upper part of the shelter above the electrodes and the gas outlet is made in the form of a water-cooled plate, movable dielectric seals are installed above the holes in the casing. »>.