SU1210921A1 - Arrangement for trapping electric arc furnace waste - Google Patents

Description

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The invention relates to metallurgy, namely, electric alumina production, and can be used in other areas of the national economy, where it is necessary to ensure hazard trapping over heat sources,

The purpose of the invention is to increase the efficiency of capturing fugitive emissions from electric arc furnaces.

The air cooling of the self-propelled shut-down increases the reliability of operation, and the air inlet slots and ends improve the airtightness of the cover and prevent the hazard from being pulled outside the shelter chamber, increasing the efficiency of capturing fugitive emissions.

Fig, 1 shows the proposed device, the cross section; in FIG. 2, section A-A in FIG “in FIG. 3 is a section BB in FIG. 2; Fig, 4 - section GG in Fig, 3 | Fig, 5 is a section bb In Fig, 2,

Electric arc furnace 1, bucket 2 for molten metal and slag bowl 3 are covered by a shelter chamber 4, in which sliding doors 5 and 6 are provided for passing the bucket 2 and bowls 3 The top of the shelter chamber 4 is equipped with a self-propelled ventilated ceiling 7 and a receiver 8 of the exhaust gas - tract. Receiver 8 emissions from air ducts 9, on which the control valve 0 is provided, is connected to gas cleaning. On self-propelled ceiling 7, fans 11 and valves 12 are installed, which prevent air from flowing through the non-operating fan. The ventilated self-propelled ceiling 7 has slots 13} along the edges, and in the place of junction of the valves in slots 13, guide vanes 14 are installed. Chamber 4 is equipped with inlets 15 with silencers 16,

The device works in the following way.

During operation of the furnace 1, the opening in the upper part of the shelter chamber 4 is closed (the shutters of the ceiling 7 are reduced). Through the air duct 9, gases are drawn to the gas cleaning system, exhausted through the emission receiver 8, while the valve 10 is closed. Part of the fans II through the corresponding open valves 12

supply air to the ventilated self-propelled ceiling 7, cooling the heated air 7, the exit from the slots 13 with I4s guide blades prevents gas from escaping through the leakiness of the cover-chamber 4, the air is supplied to the chamber 4 through adjustable inlets 15 with P1 silencer sixteen,

The proposed device provides an efficient capture of fugitive emissions and, with an open opening in the upper part of the shelter chamber 4, Taking into account the large size of the open opening, an air curtain is provided that allows air to pass through. All the fans 1I through the open valves 12 pump

air through a hollow ventilated overlap 7 to slits 13; Blades 14 provide air outlet towards the receiver 8 emissions. In the changeover

transporting hazardous substances to the suction plane, its emission receiver holes 8, gases that are suctioned through the emissions receiver B, go through the duct 9 to gas cleaning, the flow of sucked gases is controlled by valve 10 on the duct 9, depending on the intensity of fugitive emissions, changes Yush, her during various techno.

logical operations.

The air leaving through the slots 13 prevents air from escaping through the density of the gases due to the positive pressure in the upper part of the shelter, B

As a result, localization of hazardous emissions is provided with a smaller amount of suction.

In the electric steel shop (EFSC) are widely used block scheme

gas cleaning systems - with individual installation of the filter and smoke exhausters for each of the furnaces. For the aspiration of the dry bulk and out-of-furnace metal path, separate systems are provided. The use of a common workshop gas cleaning with known gas removal devices does not lead to a reduction in the performance and power of gas cleaning, since each furnace

during all the periods of the technological process the same maximum calculated amount of the gas-air mixture is sucked6

The device allows, with a common unified workshop gas cleaning, to significantly reduce the total consumption of pumped water through the use of a mismatch between the furnace modes on the furnaces, since the furnaces serve one crane and there can be no simultaneous loading of two furnaces.

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The proposed device provides, in comparison with the known ones, an increase in the efficiency of trapping gaseous smelting products at. 5 application of serial cranes; improved sealing chamber; reducing the cost of capturing and cleaning gases.

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VIYUSHI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raugaska nab., 4/5

Branch PPP Patent, Uzhgorod, ul, Proektna, 4

Claims (1)

A DEVICE FOR COLLECTING UNORGANIZED EMISSIONS FROM A GAS FURNACE ELECTRODE, containing a shelter with a receiver and a gas exhaust path and with an air curtain on a double-wing self-propelled m ceiling, made in the form of closed ventilated cavities, characterized in that it is not used to increase the efficiency of electroorganism of furnaces, flaps of a self-propelled ventilated ceiling are provided with slots at the ends, and at the junction of the flaps to each other and to the shelter chamber in the slots before See vanes directed to the receiver emission,