DD280164A1 - DEVICE FOR DETECTING THE SMOKE GASES ON AN ELECTRIC ARC - Google Patents

Abstract

The invention is applicable to operations in the metallurgical industry and relates to a device for detecting the fumes of an electric arc furnace. According to the invention, a bifurcated tube, which has a controllable obturator in one part, is arranged between an adjustable flap manifold and a hood outlet tube and suction manifold. This has the advantages that with simple means and regardless of the incurred in the individual phases of melting in different amounts Rauchgasstroeme a energieoekonomische and with little loss of material complete detection of the flue gases to an electric arc furnace and the flue gases in the optimum temperature range of heat recovery system can be supplied.

Description

connected in the oven room through which the flue gases are sucked out of the Oieninnenraum. In the area of the cover holes, the working door and the tapping opening, the suction hood is mounted, which detects the flue gases exiting at the electrode penetrations, at the working door and the tapping opening.

For the complete detection of the flue gases on an electric arc furnace, the volume flows are adjusted with the adjustable flap and the reguliei Baren obturator, the Abspei rorgan bsi open flap regulates the extracted from the furnace chamber flue gas amount depending on their different amounts in the metallurgical melt phases. The flap in the manifold also affects a flue gas socket on the hood and regulates the supply of cooling air. When the shut-off device is closed, the exhaust suction of the hood of the hood exiting the furnace and being sucked off can be adjusted by means of the flap.

As a result, the Abbrandverluste the electrodes are low, the suction of false air connected to the hood and reduces the temperature losses in the flow.

With the shut-off device and flap open, it is possible to detect the maximum amount of flue gas (refining of the melt), and an optimum flue-gas temperature in the collecting line is achieved for the subsequent processes, flue gas cooling / heat recovery and dust separation.

The advantages of the device according to the invention are that with simple N'itteln and regardless of the incurred in the individual phases of melting in different amounts flue gas flows an energy-economical and with little loss of material complete detection of the flue gases to an electric arc furnace, the flue gases supplied in the optimum temperature range of a heat recovery system can be avoided and environmental pollution caused by escaping flue gases.

embodiment

The invention will be explained in more detail by way of example.

For this purpose, the associated drawing shows the device on an electric arc furnace in section.

It is shown that a downpipe ö; 7, which has a controllable obturator 10 in part 6, between a manifold 8 with adjustable flap 9 and a Haubcnauslaßrohr 12 and exhaust manifold 2 is arranged. The exhaust manifold 2 is connected by a slip ring 1 with the fourth cover hole in the furnace chamber 11, and the suction hood 3 is mounted in the region of the cover holes, the working door 4 and the tap hole. The distance χ is 0.035 to 0.055 times the diameter of the sheath 6; 7th

A detection of the flue gases at the electric arc furnace takes place in such a way that, depending on the individual melt phases, the flap 9 and / or the obturator 10 are adjusted.

This is done by electrical actuators that are involved in the computer-aided process control.

Claims (2)

1. A device for detecting the flue gases on an electric arc furnace, consisting of two suction, a direct from the fourth cover hole and a mounted above the furnace Haubb, with separately arranged and connected by pipes exhaust fans, filters and an intercooler or a guided in the exhaust manifold furnace manifold smaller Diameter, a cover flange and a plurality of actuating devices, characterized in that a downpipe (6; 7), which in the part (6) has an adjustable obturator (10) between a manifold (8) with adjustable flap (9) and a hood outlet tube ( 12) and exhaust manifold (2) is arranged. 2. Device according to claim 1, characterized in that the distance χ the 0.035 to 0.055 times the diameter of the trouser pipe (6, 7). For this 1 page drawing Field of application of the invention The invention is applicable to companies in the metallurgical industry ui. J relates to a device for Eifassung the flue gases on an electric arc furnace. Characteristic of the known state of the art By DE-OS 2511387 a device and a method for suction and cleaning of exhaust gases from metallurgical furnaces, in particular of electric furnace, wherein the exhaust gases are sucked off directly through the fourth cover hole from the oven and on the other hand by a suction hood arranged above the furnace. For this purpose, the furnace is completely surrounded with e'ner consisting of sound-absorbing materials suction hood, separate exhaust fans and filters and an intercooler are connected by pipes, and both suction devices are operated so that during the melting, blowing and fine direct extraction from the oven and at the same time an extraction from the hood should be done. Disadvantages are the high technical complexity for exhausting the exhaust gases and the large space requirement. These disadvantages are largely eliminated by the device shown in DD-PS 245711 for pollutant detection of metallurgical electric furnaces, especially electric arc furnaces. For this purpose, a arranged in the fourth cover hole Ofenkrümmer arranged in the set on the furnace cover suction hood, second suction manifold of larger diameter coaxial. On the second exhaust manifold is in a the diameter of the Ofenkrümmeis adapted, central bore-facing cover flange slidably, mi: mounted adjustable distance to the end of the furnace bend. On a coaxially spaced from the second Absaugkrümmer arranged, common suction pipe is mounted a displaceable together with the cover flange and / or with adjustable distance to the cover flange counter flange. This device should allow to meet the requirements of the metallurgical process and / or the requirements of an orptimal Verwe> possibility of the polluted exhaust gases inherent energy according to the extracted directly from the furnace and the hood of the pollutants, if necessary, with the addition of a small amount of false air immediately after To exit from the oven to mix, in which the distance between the cover flange and the end of the furnace elbow is adjusted according to requirements and / or an appropriate distance between the cover flange and the counter flange is set. The disadvantages of the device for pollutant detection described in DD-PS 245711 is that the extracted from the fourth cover hole volume flow rate during the melting refining period to reduce material losses (burnup) can not be completely prevented, reducing the suction from the fourth cover hole the suction makes the hood ineffective, thus the exiting the furnace flue gases can not be sucked and thus environmental pollution occur and a regulation of the flue gas socket by sucking false air by means of sliding flanges is energetically uneconomical. Object of the invention The aim of the invention is to reduce the installation costs, perform the detection of the flue gases energy-economically with low material losses and to reduce the environmental impact. Explanation of the essence of the invention The object of the invention is the development of a device for detecting the flue gases in an electric arc furnace, which guarantees simple extraction, low space requirements and no suction of false air effective extraction according to the different phases of the melting process. According to the invention, a bifurcated tube, which has a controllable obturator in a part, between a manifold with adjustable flap and a Haubenai.lslaßrohr and exhaust manifold arranged. It is also characteristic that the distance χ is 0.035 to 0.055 times the diameter of the sheath tube, whereby Leistungsverlusto the device are avoided by sucking false air, and tilting of the furnace vessel is possible. The exhaust manifold is through a slip ring with the fourth cover hole