SU384879A1 - DEVICE FOR CONTROLLING SLAG MODE IN THE CONVERTER - Google Patents

Description

one

The invention relates to the field of ferrous metallurgy, and more specifically to steelmaking in an “asi converter” ah.

A device for measuring the level of the oxygen purge level is known, comprising a series-connected sound receiver with a waveguide, a microphone, an amplifier, a transducer, a tape recorder, a secondary device.

To optimize the decarburization rate of the metal, the sound pressure level is measured using this device, the signal is amplified and fed to the secondary instrument. According to the indications of the secondary device, the position of the tuyere is changed.

A disadvantage of the prior art device is the incomplete use of the information contained in the signal of the switch and the use of the means to influence the process. In particular, emissions are not predicted for 2 minutes before they start, the laser mobility of the shlak is not recorded, despite the fact that the sound near the converter's mouth in a certain frequency range carries the necessary information. In addition, the use of additives on the process with the help of additives and blowing flow is not used. It should be noted that it is only necessary to change the position of the tuyere in case of insufficient effectiveness of other measures of exposure, as this measure leads to a significant change in the rate of heating of the bath and, as a result, steel becomes a significant temperature deviation from the specified value. This explains the desire of steelmakers in the conditions of domestic | X plants to maintain the position of the tuyere unchanged during purging and from smelting to smelting.

The aim of the invention is to clarify the moment and magnitude of the additives, the flow rate to blow and

The position of the tuyere and the control of these parameters with the optimization of the slag mode, excluding the choice of the | CN and obtaining at the end of the blow of the slag of the middle fluid mobility.

The goal is achieved by the fact that

5, the proposed device is equipped with a frequency filter, a control unit and an integrator, wherein the input of the control unit is connected to the amplifier through a filter, to an additive weight sensor, flow rate blowing and tuyere position,

0 and the output is with the bulk materials dispenser and the actuator. And the mechanisms for the discharge of the additive into the converter, the flow rate to blow and the position of the furMY.

The drawing shows the scheme of the proposed device.

The device contains a converter with a melt, oxygen lance 2, waveguide 3, microphone 4 in a sound receiver, amplifier 5, frequency filter 6, secondary device 7, integrator 8, control unit 9, lance position sensor 10, actuator // tuyere position flow sensor blowing

12, the actuator cost. Blowing

13, dispenser: 14 bulk materials, additive weight sensor 15, bulk material hopper 16, .executive mechanism .17 sat.pros.plant, vOVerto, p, gutter 18 t.materials.

B. INPUT of the control unit 9 connected with microphone 4 through amplifier 5 and filter 6, in addition, with filter 6 through integrator 8, with CLI. AI position of the tuyere 10, flow rate 11, weight of additive 15, and output with dispenser bulk 14 and the actuator / 7 additive discharge.

Before purging the operator prepares the First Supplement, and at the first moment of the purge drops it into the converter. Noise noise: converted into a microphone in a h. d. s., the output of which corresponds to the sound pressure at the level of the converter neck /. This signal is amplified in the amplifier 5. The voltage is applied to the filter where the signal of the selected frequency (for example, 700-1100 Hz) is extracted. The value of this signal is registered by the analyzer itself for visual control, and it also enters the control unit 9 directly and through the integrator.

Before the start of the purge, the signal. Has a value that corresponds to the background level in the workshop. At the beginning of the purge, from block 9, a signal is sent to the executive mechanism 17 to reset the supplement, as a result of which the first additive, dosed before purging, does not receive an iB k.n; vbrtor. In tutorial. 2-3.5 minutes a1l.a1k. It has a low level | Iy level, and the farm works. Iby deeply. The current value of the signal and its integral over time, taking into account the previous experience; their heats. In block 9, the weights of the components of the second stage are determined, in the form of setting a post dosing device into the dosing unit 14, which doses it and loads this field into the bunker 16 At the moment of slag foaming, the signal intensity abruptly decreases, after which from block 9 the actuator is sent to the command to lower the tuyere from the slag pickup position (for example, 1900 mm) to the purge position for. decarburization (. for example, 16 mm). In addition, from block 9 enters the mechanism 17. the command to discard the second additive, and it enters the converter. Then, from the block 9 of the metering unit, the command is received to prepare the additive known and whom the fur 17 is lowered into the coverter on command from block 9 in case of signs of upcoming outliers predicted by the signal level at the output of filter 6 for 1 -2 minutes. before nx start. If the first active carbon burning period passes without a selection of rods, this pr.isad: on the command from block 9 complements the diluting chamber (w: pat, ore) and is dumped; by mechanism 17 to the converter / command. from block. 9. This command comes before slag thickening. The slag thickening is recorded as an abrupt increase in the signal coming from the filter 6 B -block 9, and lr01pnoz1Iruta1c in block 9 according to the results of the preceding-melts. In the case of the slag-forming additive, after slag thickening, from block 9, additional com.manda are received for dosing and discharge of the dilution line. With the appearance of signs of outgoing emissions in the first decade of decarburization, a prepared lime source in advance from the block 9 to the mechanism 17 is dumped into the converter. ENL. And this one. insufficient, which is determined by the magnitude of the signal on the output of the f. filter S, from block 9, the command 11 receives the command to lower the lance by 100-300 mm. and decrease the flow rate to blow for 0.5-2 minutes. after which these parameters are returned to their original values. During the last period of the purge, the slag gradually over-acidifies, which is characterized by a gradual decrease in the signal at the output of filter 6. The signal from the peak and its integral over the time from the beginning of the decline in block 9 the final content of slag is determined by the composition and weight of the additive required to obtain. The optimum fluid permeability of the ave and povalka is supplied by koma.nda in blocks 14 and 17 for the dosing and discharge of this additive. If this measure is insufficient, the signals for changing the position of the tuyere and the flow are blowing in blocks // and 13.

PREPARE METHOD

A device for controlling the slag mode in the converter, containing a sound source with a waveguide, Microphone, amplifier, second personal and 1 set, executive mechanisms for the flow rate blowing, moving the tuyere. And resetting 1 pr..ok (B (converter, doses bulk solids, weight sensors of additives, tuyere position and flow rate blowing, characterized in that, in order to clarify the additive discharge time and their weight, flow rate and floor blowing, we can optimize the control of these parameters. and, it is equipped with a frequency filter, a control unit and an integrator, What is the input of the control unit connecting to the integrator, the weight sensors of the drive, pump, flow rate, position of the tuyere, and through the filter with the amplifier, and the output is connected to the metering powder of bulk materials. squeeze, flow rate blowing and movement of the tuyere.