SU973625A1 - Device for controlling bath level in converter during blasting - Google Patents

Description

The invention relates to ferrous metallurgy, namely to control the converter process .. ‘

A device for controlling the level of a bath in a converter is known, which contains an emitter and a receiver of electromagnetic waves and a meter for the duration of the passage of waves from the tuyere nozzle to the surface of the bath and vice versa [1].

The disadvantage of this device is its complexity and low reliability due to harsh operating conditions.

Closest to the invention is a device for controlling the level of the bath in the converter, which contains a lance position sensor relative to the stationary structures of the converter, the input of which is connected to the lance drive, and the output to the meter connected through the first division unit to the first adder, and a probe for correction input [2].

However, this device does not allow measuring the level of the bath in the converter during purging.

The aim of the invention is to increase the accuracy of control.

This goal is achieved by the fact that a device containing a tuyere position relative to the stationary structures of the converter, the input of which is connected to the tuyere drive, and the output, the output is electrically connected to a meter connected through the first division unit to the first adder, and a correction input probe, a probe drive, a command device, further comprises a horizontal tuyere oscillation sensor 10, a tuyere oscillation meter, a converter, three pulse counters, four memory blocks, a second, third and fourth division blocks, a prod block Purge durations, purge start block, blast flow meter, blast flow meter, second and third adders, initial condition input block, functional converter, cycle end block, probe position meter, three delay blocks, And block, and the tuyere horizontal oscillation sensor is connected through a meter and converter with the first and second counters of 25 pulses, the outputs of which are connected respectively through the first and second memory blocks, the second and third division blocks with the first adder, to which, in addition to about through fourth dividing unit block duration purge podsoedi30 it starts blowing unit connected to the sensor position of the lance ¹ HO- respect to the fixed structure of the converter and the blast flow through the meter - a flow sensor, to one of the inputs of the first adder 5 directly governmental a second adder is connected, the input of which is connected to the input block of the initial conditions and through the functional converter, the third pulse counter and the end block; q cycles to the converter drive, and the output of the first adder is connected the third adder, which, in addition, through the third memory unit, the probe position meter and the control unit is connected to the probe drive, and the output of the third adder is connected through the fourth memory unit to the first adder, the input of the fourth 'memory unit being connected directly and through the delay unit to the iamery - ^ θ an integral probe, which, in addition, is connected via the And block to the third memory block, the And block and the third memory block being connected to the camcorder, and the purge duration block 25 is connected directly and black of the second delay unit with the first and second pulse counters, the latter, moreover, is connected to a second dividing unit. thirty

The circuit contains

The drawing shows a block diagram of a device.

The circuit contains a lance position sensor 1; tuyere 2, - converter 3; 35 lance drive 4; lance meter 5block 6; adder 7; lance oscillation sensor 8; tuyere vibration meter 9; transducer 10; pulse counters 11 and 12; blocks up to memory 13 and 14; division blocks 15-17, purge duration block 18; purge start block 19; blast meter 20; blast meter 21; an adder 22; block input initial conditions 23; functional converter 24; pulse counter. owls 25; block ending cycle 26; converter drive 27; adder 28; memory unit 29; probe position meter 30, command device 31; probe 50 drive 32, memory unit 33; delay unit 34) measuring probe 35; block And 36; delay blocks 37 and 38.

The sensor 1 of the position of the lance 2 relative to the stationary structures of the Converter 3 is connected to the actuator 4 of the lance. The output of the sensor 1 is connected through a meter 5, the first division block b to the adder 7. A lance oscillation sensor 8 is connected through a meter 9 60 and a converter 10 to the first 11 and second 12 pulse counters, the outputs of which are connected respectively through the first 13 and second 14 memory blocks, second 15 and third 16 65 division blocks with adder 7. Adder 7, in addition, through the fourth division block 17, the purge duration block 18 is connected to the purge start block 19, which is a circuit I. The purge start block 19 is connected to the lance position sensor 1 relatively fixed constructions of the converter and through the meter 20 flow blast with the sensor 21 flow. The adder 7 is also connected to the second adder 22, the input of which is connected to the initial condition input unit 23 and through the functional converter 2ph, the third pulse counter 25, the end cycle unit 26 with the drive 27 of the converter. The output of the adder 7 is connected to the third adder 23, which, through the third memory unit 29, the probe 30 and the command 31 are connected to the drive 32 of the probe, and the output of the third adder 28 is connected through the fourth memory unit 33 to the first adder 7, the input of the fourth memory block 33 is connected directly and through the delay unit 34 to the measuring probe 35. The measuring probe 35 is connected through the 36 AND block to the third memory block 29, and the 36 AND block and the third memory block 29 are connected to the command device 31. Block 18 continue The purge unit is connected directly and through the second delay unit 37 to the first 13 and second 14 memory units and through the third delay unit 38 to the first 11 and second 12 pulse counters, the latter being further connected to the second 15 division unit.

At the beginning of the process, when the purge takes place in the buried jet mode, the tuyere oscillations are close to free and occur with a large amplitude and low frequency. As the tuyere is flooded with a slag-gas-metal emulsion, the oscillation frequency increases and their amplitude decreases. At the end of the purge, when the process goes back to a shallow jet mode, the amplitude increases and the tuyere oscillation frequency decreases.

The level of the bath in the converter during purging is determined by the formula e = c < ₀ * A ♦ + f (е, + 41. ₀ + Δ1,))

Where ΐ - bath level in the converter - Tere during purging, m; - coefficients; A - amplitude of vibrations tuyeres concerning the point of its fastening, mm; η - oscillation frequency we are relative to the point of fixation, imp./min,

Η - the position of the tuyeres relative to the stationary structures of the converter, m;

f is the functional dependence; ''

B - purge duration, min;

- amendment taking into account the change in the level of calm metal, from the mass of the metal cage and the height of the converter lining, m;

- correction, determined by control measurements of the bath level at the time of measuring the temperature and carbon content by the probe method without turning the converter, m

flU ₀ = cl ₄ * £ (G) ♦ £ (N), (2 ”where G is the metal charge equal to the sum of the amount of scrap and cast iron for melting, t;

N -. Melting number during the converter lining campaign;

d ₄ - coefficient.

The magnitude of the coefficients of the functional dependence is determined by the capacity of the converter, the design of the tuyere, etc. For conditions of a 130-ton converter when purging with a four-nozzle tuyere with a nozzle opening angle of 15 ° and an oxygen supply intensity of 3-4 nm ³ / ?. min << о - 5, 9 m, 'di = 0.440 m / mm; oi ₂ = 0.0055 m.min / imp „· s £ s = - 0.235; f (^) = 0.512 sinOJITM.

4L ₀ -2.99-001N (3)

The device operates as follows.

Before purging, a signal proportional to the metal charge is supplied from the initial condition input unit 23 to the adder 22, which simultaneously receives a signal proportional to the change in the bath level from the wear of the lining from the functional converter 24. A voltage proportional to d? ₀ by ¹ 'formula (2), which enters the adder 7. At the beginning of purging, the envelope tera when lowering the tuyeres and applying blast signals proportional to ve. the values of these parameters are received from the 4 tuyere drive to the Fourier position sensor 1 and from the blast flow sensor 21 to the meter 20. In the sensor 1 and the meter 20, the position contacts established on the operating values of the parameters work (for example, for conditions of 130-ton converters with values the distance of the tuyere nozzle to the level of calm metal 3 m and the oxygen flow rate equal to 75% of the nominal value). At the same time, at the output of the purge start block 19, which is an AND circuit, a voltage corresponding to logical 1 appears, which enters the purge duration block 18 consisting, for example, of an electric motor connected by a shaped cam to an output converter. A profiled cam implements the dependence f (τ) of expression (1). Thus, a voltage proportional to [sίπθ, 31ϊ appears at the output of block 18. This voltage is supplied to the division unit 17, the output voltage of which, proportional to 0.512s In 0.3 IT, is supplied to the adder 7. A signal proportional to the tuyere position relative to the stationary structures of the converter is transmitted from sensor 1 to meter 5 and from there to block 6 divisions. From the output of the division unit 6, the adder 7 receives a voltage proportional to the value of c1 _e N. The voltage from the lance oscillation sensor 6 is supplied to the meter 9, the output signal from which is supplied to the converter 10, which is, for example, a strobocylinder with slotted holes, inside of which two sources of radiation (incandescent lamps), and on the other hand, radiation receivers (photodiode). The strobe cylinder is placed on the axis of the engine moving the arrow of the current meter. The radiation sources are offset relative to each other by a distance equal to half the width of the slotted hole, i.e. if one source is [against the gap, then the second is against the pitch. Thus, pulses appear at the output of the photodiodes, the number of which is proportional to twice the number of slotted holes that passed the receiver and the radiation source. The pulse counter 11 counts the pulses from the first photodiode. In addition, the converter 10 contains two pulse counters for two, the inputs of which are connected respectively to the first and second photodiode, and the reset circuit with the second and first photodiode, and the outputs through the OR circuit with a pulse counter 12. Thus, pulses appear at the output of the OR circuit , the number of which corresponds to the number of changes in the direction of rotation of the motor moving the arrow of the current meter. After a period of time different to the measurement cycle (for conditions of 130-ton converters, when blowing with a four-nozzle lance with a nozzle opening angle of 15 ° and an oxygen supply intensity of 3-4 nm ^{5 /} t.min. 10 s), the purge duration block 18 gives out a pulse in blocks 13 and 14 of the memory to reset the previous readings, through the delay unit 37, the same pulse allows writing to the blocks 13 and 14 of the memory of the readings of the counters, pulses 11 and 12, and then through the block 38 of the delay reset the readings by the counter 11 and 12 Next, the measurement cycle is repeated. The readings of block 14 are proportional to the frequency of the lance oscillations, and the readings of block 1 3 are the sum of the amplitudes of the lances of the lance per measurement cycle. The output voltage of the memory unit 14 is supplied to the division unit 16, the output voltage of which is proportional to the value of d ₂ n, is supplied to the adder 7. The output voltage of the memory unit 13 is supplied to the division unit 15, where the voltage from the division unit 14 is simultaneously supplied. , proportional to d ^ A, enters the adder 7. Thus, the output voltage of the adder 7 is proportional to the level of the bath in the converter during the purge.

At the time of measuring the bath level by the probe method, the angle of rotation of the actuator 32 is transmitted through the command device 31 to the meter 30 of the position of the probe and from there to the memory unit 29. The command device 31 allows writing to the memory unit 29. When the surface of the gas-slag-metal emulsion is touched by the probe 35, the block And is activated, sending a Stop signal to the memory block 29, thus, the readings of the memory block 29 correspond to the level of the bath. The voltage from the output of block 29 enters the adder 28 where it is summed in antiphase with the output voltage of the adder 7, The output voltage of the adder 28, proportional to at, enters the memory unit 33 and from there to the adder 7. With a new measurement of the bath level by the probe method, the block 33 is reset. memory when touching the surface of the gavo-shLako-metal eglulse with probe 5 and recording permission through the ejector block 34. Upon completion of the melting and draining of slag, the cycle end block 26 is activated, transmitting a pulse to the pulse counter 25, in which lining number changes by lining to. unit. The output voltage of the pulse counter 25 is supplied to the functional Converter 24, the output voltage of which is proportional to the value ('GB, 6 + 0,016214' ⁺ *) '

The economic effect of using the invention according to estimates is 40 thousand rubles. in year. Economic efficiency is ensured by increasing the yield by 0.3%, which reduces the cost of steel by 0.07 rubles / ton.

Claims (2)

1. US patent 3,701,518, cl. C 21 C 7/00, 1972. 2. Authors certificate of the USSR 326222, cl. C 21 C 5/30, 1968.