SU761818A1 - Method of measuring contoured area of two bodies contact - Google Patents

Description

The invention relates to gas removal systems of electric arc furnaces and the entire length of melting and when metal is poured into the ladle.

Known electric arc furnace with exhaust devices, including exhaust shaft, mounted on the furnace, and a movable exhaust umbrella [1].

Such a device has large dimensions, cumbersome to use. The disadvantages of such a gas removal should also include the fact that the upper part of the electrical power supply (electrodes, electric holders and their rods) is in the hot gas flow, which will cause their rapid wear and require partial replacement of contact elements. /

Known installation for the production of metals by metallurgical smelting with a gas outlet kalpak; inside of which, like in a chamber, a melting furnace is placed, and for moving the loading elements from the gate, closing doors are installed (2). Such complete shelter of the space around and, over the furnace, although it provides / non-proliferation of gases throughout the workshop, creates worse conditions for staff, its device is difficult and expensive. Due to significant air suction,

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exhaust gases are very large, which will inevitably lead to increased power of the gas cleaning plant. \

It is also known a device for removing gases generated in an electric furnace, which is a gas-sampling pipe, which intersects with the mine to supply the charge, thereby providing partial dedusting of the exhaust gases and

10 prevents their selection through the loading of the charge. [3]. Such a device, especially in the part of the mine to feed the.

¹ ; gee, has significant dimensions, its application is difficult to implement because of the need to provide bulky cooling detachable elements. Serve, the bath of the upper part of the furnace in the presence of such a device will present significant difficulties. Also in the 'period

20 long-term supply of charge materials, gas removal will be significantly reduced, which will lead to the discharge through the leakiness of the furnace into the atmosphere of the workshop for reptiles and dust.

25 The closest in technical essence and the achieved effect to the described invention is a device for suction of gases from an electric arc furnace, containing a gas flue with a nozzle installed. in the hole in the arch of the furnace, and voz761818

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the breeder, fortified to the furnace tap hole [4]. The presence of complex curved pipelines makes the device difficult to manufacture ^ operation. Free installation of the suction nozzle in the hole

“in the vault it presupposes forced gas suction during all periods of smelting, however this is unacceptable in the second half of smelting. (when boiling and in the reduction of the metal). The general reduction of the pelvic discharge, usually nrak-. Impacted during this period of smelting, can lead to emissions of the “Fold into the gaps” between the nozzle and the hole in the roof, i.e., the efficiency of gas removal will decrease. Suction from the bucket, made one-sided air duct, will not provide because of the limit "

of the complete suction gas absorption zone during the steel pouring period. Placing all the suction elements on one side of the furnace creates a significant unsealed load on the furnace.

The aim of the invention is to increase

'efficiency of gas removal during the finishing operations of steelmaking and with you. pouring it into the ladle, as well as reducing unbalanced loads on the furnace.

This is achieved by the fact that the gas duct with the nozzle M 'above the fourth hole in the furnace roof and the air ducts are attached to the collecting manifold, which are rigidly fixed to the furnace bath below the service platform, and are connected through two hinges and a telescope located under the furnace bottom with a stationary gas removal system . A valve is installed in the collector, alternately disconnecting the duct or air ducts, respectively, at the operations of steel smelting to the finished metal drain, and additional valves with flaps, which are connected by flexible cables to the fixed service platform, are mounted on the drain end of the drain. furnace through compensating springs. FIG. 1 shows the proposed device; in fig. 2, 3 - the same, if the furnace operates in the mode of steel smelting; on .fig. 4 - the same, when pouring metal into the ladle.

The device contains attached to ne.

whose box-shaped manifold '1, to which the duct 2 is connected with a nozzle 3 above the fourth hole in the furnace vault, the duct 4 from the working window shelter 5 and the air ducts 6 at the toe. The duct 2 has a detachable connection 7, which allows lifting of the vault and discharge its side when loading the bath with the charge. ”The collector 1 connects to the stationary gas removal system through a telescopic joint 8 located under the furnace bottom, In the collector / valve 9 is mounted with the actuator 10, and at the free ends of the air ducts 6 - Klapa s 11 angled 6–8 °. The valves 11 are fitted with flaps 12 and are connected by flexible cables 13 to a fixed serving platform of the furnace through compensating springs 14. The pivot-telescopic connection 8 is made on equal hinges <n telescopic pat. point slide bearings in the form of balls.

The gases leaving the furnace throughout the steelmaking are sucked in> mostly from the zone of the fourth hole; cut the pipe 3 of the duct 2 and during periods of Maximum discharge from the working window area through the shelter 5 by the air duct 4, then the gas-air mixture flows through the collector 1 and the telescopic articulated joint 8 into the stationary system, gas removal. 'Valve 9. At this time is installed so that it closes the part of the collector to which it is connected (air ducts 6, and valves 11 are closed.

Gas removal system in conditions. gaskets around the electrode gaps are sucked only from gases released from the furnace, which allows not to influence the process of gas formation in the furnace and not create additional air leaks into the furnace through the working window. When slag is downloaded through the working window or when metal is released, there is a hinge, but a Teleocopic connection. '8 allows you to tilt the furnace, without interrupting the selection of gases in places. Their maximum discharge. When the finished metal is drained into the ladle, all elements of the device bend together with the furnace, and already at the beginning of the furnace turning, and the metal discharge valve 9 by the electric actuator 10 is turned, cutting off, suction from the furnace, and the valves 11 due to flexible pipes 13 , the required tension of which is maintained by the springs 14, which also compensate for the linear. The furnace moves open, and there is an intense suction of carbon dioxide that is released during the production of steel. The presence of zakrylo.k 12 on the valves 41 allows you to bring suction suction zone to the bucket aperture. When the furnace returns to its normal position, the valves 44 are closed, and the valve 9 is returned by the actuator 10 ъ to its original position. The rise and removal of the arch for loading v.anny charge is carried out together with attached to it the pipe 3 and. the upper part of the flue duct 2. Upon subsequent installation of the vault and its lowering onto the bath, the upper part of the gas suction unit 2 is connected to its lower part, the reliability of the tight junction is achieved by installing a telescopic nipple 16, freely suspended from the flue duct, on this slope.

Placing all the elements of the device relatively evenly around the perimeter of the furnace provides a uniform balanced load on the furnace.

, 761818

Claims (1)

Claim . An apparatus for removing gases from the electric arc furnace, comprising a flue pipe in .svode furnace ducts at (fastening to the drain and toe shelter over the working window, and a collecting manifold pivotally-gazoudaleagiya telescopic connection system wherein ^1, which, in order to increase the efficiency of gas removal during the finishing operations of smelting, steel and pouring it into the ladle, as well as reducing unbalanced loads on the furnace; Oscar, respectively, on draining operations (finished metal and melting of sali and connected through hinges and telescopic joints located under the bottom Furnaces, 'with' stationary, gas removal system.