SU1523870A1 - Device for monitoring metal level in ore-smelting furnace bath - Google Patents

Abstract

The invention relates to electrothermal conditions, namely to the control of technological parameters during the smelting of non-ferrous metals in a bath of an ore-thermal furnace, and can be used in ferrous metallurgy. The aim of the invention is to increase efficiency and reduce the complexity of control. In the device for controlling the levels of melts, the electromagnetic radiation receiver is made in the form of two blocks, each of which includes at least five inductance coils 1-5, amplifiers, comparators, each receiver connected in series with the input of one amplifier 6, the output of which is connected to the inverting input of the second the comparator 7.2, the output of the first comparator 7.1 is connected to the input of the first transistor switch 8.1, the output of which is connected to the control electrode of the thyristor 9.1 connected in series with the indicator lamp 10.1 egistriruyuschego device 11. 1-yl., 1 tab.

Description

Slag

Matte

receivers

t

ate to

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From () P | 1e1 oiis (ttnosya to elektri-ermi1-, .1 them (ins) to control gehnolo-1I-1shee gtlrametrov when smelting color ms1lllov prudno-thermal pe-Miix (RTP), and can also be used F a) ferrous metallurgy.

The aim of imbibing is to increase .operability and to reduce the fc (.1 of the control of melt levels

The drawing shows the block diagram of the usry of the t.

The device for controlling the levels of melts sg) holds two blocks L, b of the receivers e / 1electromagnetic radiation, in the block L coils 1-5 | are installed; they are connected, and the coil 1 of the inductance is connected in series with the inlet 6.1, the output of which is connected to the input the first comparator 7.1, which is non-inverting. The ralod is connected to the inverting input of the second comparator 7-2, the output of the first comparator 7.1 is connected :: to the input of the first transistor clamp 8.1, the output of which is connected to the control electrode of the thyristor 9.1 which includes ene sequentially with / lamp 10.1 dika the secondary recording device. Coils 2-5 are inductive (; the symbols are connected to a circuit similar to the one described. A unit L is a receiver for controlling the level, and a block B is for a receiver (.. ngrol slag level. Dedenib; an egg inductance in block B of the receivers Br and 1 is similar to the connection of the coils in block L.

The device operates as follows) m.

When the electrodes are immersed in the slag melt, the current flows from the electrodes and is closed in the following way: electrode - slag melt - electrode; electrode - slag - matte - slag - electrode; electrc d - slag - matte - metallized nastil - matte - schLG - electrode. In this case, the current density in the melt is not uniform and has extremes at the boundaries of the media separation. The current flowing in the melt generates a magnetic field, which is recorded with the help of electromagnetic radiation receivers, installed outside the caisson electric furnace. At the same time, the ED (the magnitude of which is proportional to (1H, -1 lml H-i 1 and 1JH-) and the magnetic field is induced at the terminals K, 3iyi; -oK 1-5 inductance.

five

0

five

0

five

0

five

0

five

The floor is in place of the inductance coil. A signal proportional to n) magnetic field voltage from the inductance coils 1-f) is set to the inputs of amplifiers 6.1-6.5. The amplified signal from the output of the amplifiers arrives at the inverting input of the comparators 7.1–7.5. The non-inverting input of the first comparator 7.1 is connected to the inverting input of the second comparator 7.2, and the non-inverting input of the comparator 7.2 is connected to the inverting input of the comparator 7.3, etc. In this case, those comparators are triggered, the voltage difference between the inverting and non-inverting inputs of which is greater than or equal to zero. When the comparators 7 are triggered, the electronic switches 8 are connected to the corresponding comparators 7 and open the thyristors 9, which supply voltage to the corresponding indicator lamps 10 of the recording instrument. Thus, the indicator lamps 10 that are located up to the interface between the media, i.e. they will record the levels of matte or slag determined by the geometry of the installation of inductors on the side wall of the ore-thermal furnace.

Example. Two blocks A and B of electromagnetic radiation receivers, including 12 inductors in each block, are connected by a multi-core screened cable from the outside of the caissonized ore-thermal furnace at places of possible separation of media (slag-matte and slag-charge) 50 mm in pitch with two electronic blocks consisting of amplifiers, comparators, electronic keys and thyristors. The electronic units are connected by a multi-conductor cable with indicator lamps 10 installed on a recording device (on a mnemonic circuit). The electronic units and a recording device are installed in a panel melting shop on the ore-thermal furnace control panel. On a switched on electric furnace, the levels of matte and slag will be recorded directly in millimeters on the registering device. For example, the pole of the inductor is set at 550 mm, and the seventh - at the level of PSB mm. Therefore, when the level of matte 600 mm will burn

Signal lamps 10.1-10.7, showing the level of steinp BOO mm.

The data of experimental studies of the device for controlling the levels of melts in a bath of an ore-thermal furnace in comparison with the known and basic object, which is the control of the levels of melts manually on a disabled ore-thermal furnace, is given in the table. When measured using the proposed device, the level is obtained directly in millimeters, and the operator does not need to determine the levels from the chart paper, as is done in the known device.

From the analysis of the table it can be seen that using the proposed device it is possible to automatically control the levels of melts with an error not exceeding t 50 mm, which is sufficient for plant practice.

The use of a device for controlling the levels of melts in a bath of a ore-thermal furnace in comparison with a known device with the same no-resolution improves the efficiency of monitoring and reduces complexity by using a mimic, which displays an indication of the current level of melts.

Claims (1)

Invention Formula A device for monitoring the levels of melts in a bath of an ore-thermal furnace, comprising an inductively emitting electromagnetic radiation receiver in the form of a coil This device is characterized by the fact that, in order to increase efficiency and reduce control complexity, it additionally contains electromagnetic radiation receivers made in the form of two blocks, each of which includes at least five inductors, amplifiers, comparators, electronic keys and thyristors, each coil inductance connected in series with the input of a single amplifier, the output of which is connected to the inverting input of the first comparator, the non-inverting input of which is connected to an inv The secondary input of the second comparator, the output of the first comparator is connected to the input of the first transistor switch, the output of which is connected to the control electrode of the thyristor, in series with the indicator lamp of the recording device.