SU1421775A1 - Apparatus for monitoring slag level in converter - Google Patents

Abstract

The invention relates to the field of ferrous metallurgy, in particular to the control and regulation of oxygen-smelting smelting processes, and can be used to control the level of slag in oxygen-converter production. The purpose of the invention is to improve the accuracy and reliability of slag level control in the converter. Two blocks 4 were introduced into the device, dynamic noise compensation, two adders 6, 13, vibration sensor block 8, second preamplifier 9, second frequency selective amplifier 10, second detector 12, second voltage converter 14 — current, flow meter 15 oxygen-blowing unit 16 for determining the purge mode, unit 17 controlling the position of the oxygen tuyere and microprocessor unit 19 for controlling. The combination of these blocks makes it possible to control the level of the pshak in the converter, taking into account the effect of changing the position of the tuyere, the intensity of the purge, as well as wide-spectrum sound interference both through the noise measuring channel of the converter and through the measuring channel of the vibration of the converter housing. 6 Il. 2 tab. S

Description

Compressed neutral gas

| 01

From the relay cervical oxygen valve. are blowing

The invention relates to ferrous metallurgy 5 namely to the control and regulation of processes of oxygen-converter melting, and can be used to control the level of slag in oxygen-converter production.

A: The purpose of the invention is to improve the accuracy and reliability of the slag level control in the converter. : FIG. 1 shows a block diagram of the device; in fig. 2 the internal structure of the unit for determining the mode of sounding 5 of the microprocessor control unit and the unit for dynamic compensation of interference; in fig. 3 and 4 - the internal structure of the detectors | Fig. 5 is a diagram of the recording of the change in evut pressure at a frequency of 265 Hz lio to the melting code without compensating for interference (| a) and with dynamic compensation of schgi nor for the magnitude of the high-frequency signal of wide-spectrum igum interference (b); Fig. 6b shows a graph comparing a defined level of the Nshak level when using the proposed and well-known devices with a true value of 5.5 level 5pack 3 converter with

The device (Fig 1) contains a microphone block I with a sensor with an inert gas blowing waveguide, a preamplifier 2, a frequency amplifier 3, a block 4 of a differential compensation noMeSj detector 5e cyi-shator 6, a voltage converter 7 - current, vibration sensor unit 8, second preamplifier 9s second frequency-selective amplifier 10, second block II Dynamic noise compensation, second detector 12 vtsfoy adder 13 second converter 14 voltage, TOKj oxygen generator 15 blow, block 6 mode definitions roduvki, the control unit 17 positions the relay 18 time m po n potsecsorny jfnpaBJseHHH unit 19 and the recording device. 20

The microphone sensor unit 1 with an inert gas blowing waveguide contains a waveguide 21j a sound pressure sensor unit 22 j sensor module 23, a throttling device 2145 valve 25 with an electromagnetic drive, the pneumatic input of which is connected to the compressed neutral gas line, the electrical input is to the output of the time relay 18, and the pneumatic output to the pneumatic input

ten

15

20

25

thirty

35

40

4S

50

55

control unit 22 of the sound pressure sensor. A bypass channel 26 with a throttling device 24 is connected in parallel with the electromagnetic actuator valve 25. As the sound pressure sensor 22 and the module 23, for example, a DCC-10 sensor with a nominal frequency range from 10 to 10,000 Hz can be represented. 10 accommodates a piezoelectric sensing element with a receiving membrane (sensor 22) and an AC amplifier (module 23) with high input and low output impedance. As a valve 25 with an electromagnetic drive, through which the block body 22 The sound pressure sensor is connected to the compressed neutral gas line; a valve of the 15KCh880RSBM type with conditional passage D. 25 can be represented.

Preamplifier 2 can be represented, for example, in the form of an amplifier, in negative feedback of which a signal level control is included. The amplified signal from the microphone sensor unit 1 in the device is analyzed separately for the two paths, conventionally called the working frequency path and the compensation path.

The path of the operating frequency of the channel from the microphone sensor unit 1 includes a frequency selective amplifier 3 connected in series between itself, containing a tunable filter with an operating frequency in the range from VO to 2000 Hz, and detector 5 with a smoothing filter. Path compensation frequency content. There is a dynamic noise compensation unit 4, in negative feedback of which a compensation level regulator is included which can be represented as a potentiometer. The outputs of the paths are connected to correspond to the inputs of the adder 6, the output of which is connected to the input of the converter 7 voltage - current,.

The block V of the vibration sensor contains a vibration sensor 27 and a sensor module 2B. The vibration sensor 27 can be represented, for example, by a vibration transducer of type A4 with a nominal frequency range from 10 to 5000 Hz,

Dynamic noise compensation block 4 contains (Fig. 2) a compensation frequency-selective filter 29, which can be performed both with a tunable range from 1 to 10 kHz, and with a fixed resonant frequency, the latter being selected for each converter separately, and amplitude detector 30 signal compensation. The input of the compensation frequency-selective filter 29 is the input of the dynamic noise compensation unit 4 and connected to the output of the preamplifier 2, and the output of the compensation frequency selective filter 29 is connected to the input of the amplitude detector 30 of the compensation signal, the output of which is the output of the dynamic noise compensation unit 4 , wherein the output of the amplitude detector 30 of the compensation signal is connected to its input by means of a compensation level regulator, which is a potentiometer. In detectors 5 and 12

(Fig. 1) detectors with a constant rate of 25 are used only during the period of contact, and in the slag metal 1 emulsion unit 4 and 11 (Fig. 2) - with an adjustable one. The comparator 34 is

an operational amplifier, the first input of which is connected to the output of the module 30 23 of the sensor for determining the potential difference between the tuyere and the housing

4 and 11 (Fig. 2) - with an adjustable coefficient.

The second preamplifier 9 can be represented, for example, in the form of an amplifier, in negative feedback of which the signal level regulator is included. The amplified signal from the vibration sensor unit 8 is also analyzed separately for two paths, conventionally referred to as the working frequency path and the compensation frequency path.

The path of the operating frequency to the channel from the vibration sensor unit 8 includes a frequency-amplifier bi-amp 10 connected in series with a tunable filter with an operating frequency in the range from 80 to 2000 Hz and detector 12 with a smoothing filter. Tract cha. the converter, and the second input of the operational amplifier — to the output of the source of the reference, voltage.

2g The tuyere position control unit 17 is, for example, a K11F-7367 device.

The microprocessor control unit 19 contains, for example (FIG. 2), a normalization module 35, the outputs of which are connected to a contactless switch 36 connected via analog-digital converter 37 to the first output of the pre-processor module 38, the second

The 45 input of which is connected to the output of the information input and output unit 39, 10 kHz as well as with a fixed resonant frequency, the latter being selected for each converter separately, and an amplitude detector 32 of the compensation signal.

The oxygen flow meter 15 blows mo-. It may consist, for example, of a DS-EZ-2500 differential meter, a MAS-32 manometer,

The TCM-5071 resistance thermometer, Block 16 (Fig. 2) for determining the purge mode may consist, for example, of a series-connected sensor 33 for determining the potential difference between the tuyere and converter housing and comparator 34. Sensor 33 for determining the potential difference between the tuyere and housing the converter is an electrical circuit for

measuring the potential difference that occurs between the tuyere and the converter housing as it progresses. The signal at the output of the electrical circuit between the lance and the converter housing has a month. the converter, and the second input of the operational amplifier to the output of the source of the reference and the voltage.

2g The tuyere position control unit 17 is, for example, a K11F-7367 device.

The microprocessor control unit 19 contains, for example (FIG. 2), a normalization module 35, the outputs of which are connected to a contactless switch 36 connected via analog-digital converter 37 to the first output of the pre-processor module 38, the second

45 input which is connected to the output of block 39 for input and output of information, you

The compensation module contains a block 11 of the processor module 38, which is connected to a dynamic noise compensation, the code control module 40 includes a negative feedback, which has a compensation level regulator connected to the converter input. ° D is the current, and the output of the latter is connected to the corresponding inputs of the adder 13, the output of which is connected to the input of the conversion. sump 14 voltage - current.

The dynamic interference cancellation unit 11 contains (FIG. 2) a compensating frequency-selective filter 31, which can be implemented as a tunable in the range from 1 to

dinen with the input of the recording device 20.

The normalization module 35 can be represented, for example, in the form of the A613-2 normalization module 55, and is intended to convert the DC signals into voltage signals and to filter the sensor signals from normal-type noise.

dinen with the input of the recording device 20.

The normalization module 35 can be represented, for example, in the form of the A613-2 normalization module 55, and is intended to convert the DC signals into voltage signals and to filter the sensor signals from normal-type noise.

514

The contactless switch 36 can be represented as a contactless switch, for example, type A612-10, and is intended for switching DC voltage signals for gradual conversion using analog-to-digital converter 37, for example, type A611-20.

The processor module 38 may be represented in the form of a processor, for example, type A131-10. Information input and output unit 39 can be represented, for example, in the form of a code control module of a contactless type A 641-9, and is intended for receiving and storing binary signals from the processor module 38, and switching DC electrical circuits of a controlled object. -; ha, in particular, is intended to transform the electric coded signals into an electric continuous signal of direct current: The device operates as follows.

I From the moment of melting, signals on the process of slag formation perceived by the microphone sensor unit 1 with the inert gas waveguide element and the vibration sensor unit are amplified respectively by Preamplifiers 2 and 9 and fed to the inputs of the working frequency and compensation frequency paths respectively from the sound pressure sensor and the channel from the vibration sensor ..

In the working frequency path, the channel from the microphone sensor unit 1 from the common signal by the frequency-selective amplifier 3 extracts the operating frequency signal, which is flush and smoothed by the detector 5 and fed to the corresponding input of the adder 6, the operating frequency of the frequency-selective amplifier 3 is selected separately for each converter for a series of heats from the point of view of the greatest information content of the output signal of the device through this channel, according to the converter melting technology, in the path of the compensation frequency from The common signal by the compensation frequency-selective filter 29 extracts the compensation signal, which is input to the aplitud detector 30 of the compensation signal, is detected and smoothes

,

j 0 5

g

Q with

five

756

SI, and then enters the corresponding input of the adder 6. Compensation frequency-selective filter 29 is tuned to a frequency at which the ratio of the amplitude of the broad-spectrum noise interference to the amplitude of the converter noise component of the converter has the maximum value. The magnitude of the compensation signal at the output of block 4 of the dynamic noise compensation is adjusted by a level control, compensation. In adder 6, the compensation signal is subtracted from the operating frequency signal, as a result of which the output signal of adder 6, the voltage applied to the input of converter 7, does not contain the distortion of its component of wide-spectrum noise interference. From the voltage converter 7, the current output signal is fed to the first input of the microprocessor control unit 19.

The use of block A for dynamic noise compensation is based on the following theoretical and experimental pre-packages.

Claim 1 interferences occurring in the areas of the seal of the tuyere window and leaky materials have a rather wide spectrum approaching white noise. Therefore, they contain noises that coincide in frequency with the informative signal, on the frequency of which the frequency-selective amplifier (filter) 3 is tuned, and which can in no way be separated by this filter.

As shown by experimental studies on converters with an increase in frequency (-5) in the range from 80 to 10,000 Hz, the fractional interference coefficient K noticeably increases.

The interference share factor (KV) is determined by the formula

about t t Ln --K

 P

where, 1 - total

sound pressure interference (white noise) and converter noise on the often-; 5 those 9, Pa;

I - sound pressure of converter noise at frequency V, Pa. To determine. when the converter is being purged, the gas (or steam) is briefly cut off to the sealing places of the storehouse windows and leaky materials, thereby eliminating the effect of interference (white noise).

For example, at a frequency of 250 Hz

ISO

Kf, is on the order of 0.5-0.7, and on frequency. 5000 Hz - about 3-5.

 Therefore, in the proposed device, the compensation signal is derived from the total spectrum at a higher frequency (1-10 kHz) and its value, equal to the magnitude of the interference, is set by the variable resistor R. (Fig. 4 The frequency signal and the compensation signal with different polarity after

detectors 5 and 30 are received in the sum-output signal on this channel

 torus 6, where the subtraction of the magnitude of the noise and the selection of the pseudo signal, which characterizes the level of slag in the converter bath, occurs.

FIG. 5 shows two real diagrams a and b obtained on the same heat. Chart a shows the recording of the change in sound pressure at a frequency of 265 Hz in the course of melting without an appliance according to the technology of converter converter melting.

The vibration sensor mounted on the housing or the converter trunnion is widely affected by noise spectral noise to a much lesser extent than the microphone. However, extensive pulsed vibration disturbances that occur in the workshop during repair and maintenance

interference interference. As can be seen from this di-25 logical works, they also have a wide diagram, with an induced slash, the value of the useful signal is comparable to the amount of noise-interference, since a further increase in the slurry level with subsequent slag overflow does not lead to a change in the sound pressure (output) value.

For example, at the moments when slag overflows were observed (indicated by arrows in the diagram), the output signal almost remained at the same level as with the induced slash and did not characterize the change of the slac level in the converter's bath.

Such low information content of the output signal does not allow to control the slag level when it becomes higher than normal and approaches the converter throat.

Diagram b shows the recording of the output signal of the layout at the same frequency (265 Hz) with a dynamic compensation of the amount of micro-spectral noise in the output signal. In this diagram, at the moments of slag overflow, the magnitude of the output signal varies considerably, so that it becomes possible to monitor the change in the level of the induced speck and its overflow and release.

Thus, the use of a block of dynamic compensation allows

W

to increase the information content of the output signal of the proposed device. .

In the operating frequency path, the channel from the vibration sensor from the common signal by the frequency-selective amplifier 10 selects the operating frequency signal, which is rectified and smoothed by the detector 12 and fed to the corresponding input of the adder 13. The working frequency of the frequency-selective amplifier 10 is selected separately for each converter for a series of heats in terms of the greatest information content

devices according to converter melting technology.

A vibration sensor mounted on a housing or a converter trunnion is affected by wide-spectrum noise interference to a much lesser extent than a microphone. However, various pulsed vibration noise arising in the workshop during repair and techno

thirty

35

40

55

spectrum. the nature, and therefore, the method of compensation of wide-spectrum noise is applicable for the vibration control channel.

By adjusting the resistance value R of the resistor (Fig. 4), the influence of the pulsed vibration noise on the output signal value of the device is eliminated.

In the frequency path of the co- ordination, a compensation signal is extracted from the common frequency compensation frequency filter 31, which, arriving at the input of the compensation detector 32 of the compensation signal, is detected and smoothed, and then goes to the corresponding input of the adder 13, the compensation frequency-selective filter 31 is tuned to such a ds frequency at which the ratio of the amplitude of the interferences generated by the operation of the mechanical equipment of the workshop to the amplitude of the compressed vibration spectrum of the converter housing is accompanied by This process is maximal. The value of the compensation signal at the output of the dynamic interference compensation unit 11 is adjusted by the compensation level regulator. In the adder 13, the compensation signal is subtracted from the operating frequency signal, as a result of which the output signal of the adder 13 arrives at the input of the converter 14 to 50

9142

Contact - current, does not contain the distorting component of the vibration interference generated by the mechanical equipment of the workshop. From the voltage converter 14, the current output signal of the post drops to the second input of the microprocessor control unit 19. . ; In the open jet mode, the tuyere above the slag metal emulsion corresponds to the third input of the microprocessor control unit 19 and the signal is proportional to 0 from the output of the purge mode determination unit 16, and in the buried jet mode corresponding to the tuyere nozzles in the metal slag emulsion The third input of the microprocessor control unit 19 will receive a signal, proportional to I, of the output of the blower mode determination unit 16. The fourth and fifth inputs of the microprocessor unit 19 control signals, which are proportional to the current oxygen consumption and the position of the oxygen tuyere, respectively, from the outputs of the oxygen flowmeter 15, and the I7 position control unit.

Since the start of melting when the contacts of the oxygen cut-off valve are closed, they blow on the first outlet

:: M-

1M..

1 .4 1 (G 7 I T

but

H (t) +

)

/ j-nLu, X V b; j / b, b7-ln Vo7tT (t) 5 l,

, 2-nt) / - friTvrr + .tt

-.

, iHTvo7t7J

 T-t

funt) 1

lVH (t):

/lniO,2.I (t) J /)

d; + d7 inrv rt7j; P h (t) s

de H (t)

OK,.

I (t)

v v)

the current value of the position of the oxygen tuyere, m; the current value of the upstream signal from the sound pressure sensor, mA;

the current value of oxygen consumption to blow, m / min; the current value of the potential difference between the lance and the housing of the converter, can take the sign of 1775 0

time relay 18, an initiative signal appears corresponding to 1, with the arrival of which at the input circuit of microprocessor control unit 19, the current level of slag in the converter bath is determined by the following relation combining two different algorithms

0

N ..

ft) -p, m sp

Hr (t)

) where P, P - weights that can take knowing .I5,,

Nile)

from O to 1 (first 5. initially, 5);

H (f) - current level of slag in

converter, MJ H (t) value of slag level in

converter defined by 0. according to information from the sound pressure sensor, m; the slash level value in the converter, determined from information from the vibration sensor, m.

According to the first algorithm, the calculation of the current slag level in the converter is carried out on the basis of information received through the channel from the micro-JQ background sensor unit, as well as information on the current oxygen consumption to blow and. position of the oxygen tuyere according to the following relation

)

(t) 5 l,

(t) 5 l,

funt) 1

lVH (t): l,

(t) 0, corresponding to the open jet, and U. (t) l, corresponding to the mode of the buried jet; 1.5 Ij — boundary values of the position of the tuyere with discrete breakdown into separate zones of the working position of the tuyere, m; ЕО, а, - equation coefficients

polynomial regression

lb

c, d.

eleven

corresponding to the open jet mode;

- coefficients of equations of polynomial regression, corresponding to the mode of the submerged jet.

1A2

, 2-r {t) /

where i

me

(t) - the current value of the output signal by channel from. vibration sensor, mA; S, is the boundary value of the position of the tuyere determined experimentally, m; LJJ, 1, are the coefficients of the polynomial regression equation, corresponding to the open mode. oh jet;

-o j

five".

P5 .1

coefficients of the polynomial regression equations corresponding to the depth of the submerged jet If during operation of the device for controlling the slag level in the converter one of the information channels failed, then the weight coefficient PJ for this channel is assumed to be zero, and on the operating weight the weight factor P; is taken equal to one.

Channel failure detection is performed as follows. Since the start of melting for a period of time t 2-3 minutes (duration 6 is determined experimentally), the signals from the channel 1 of the microphone sensor unit and the vibration sensor unit 8 in the microprocessor control unit 19 are checked for compliance with the following condition

Mach

(-I- I K. RK

I. (t): K, -I ,,

(I)

Where

Ic, K (t) the current value of the output signal on the channel from the microphone sensor unit, mA;

, 61-0.76 - coefficient determined experimentally ;.

177512

According to the second algorithm, the calculation of the current slag level in the converter is carried out on the basis of information received through the channel from the vibration sensor unit, as well as information about the current oxygen consumption to blow and the position of the oxygen tuyere according to the following dependence

rk

(t) - 1

S,

FK

U (t) 1 H (p (t) i

Zr-K

U (t) & 1 H (t): S,

0

five

0

there

1D - the value of the output signal through the channel from the microphone sensor unit at the initial moment of purging on the characteristic melt, mA,

If inequality (l) is satisfied, then the channel from the microphone sensor unit 1 is faulty and, and on the second channel, if the inequality does not hold

MOM

1- I il K b1b

.... (t) iK -ie "6

(2)

 ,

35

40

45

50

.

55

Where

.. (

- the current value of the output signal on the channel from the vibration sensor unit, mA; K 0,61-0,76 - coefficient, determined

experimentally; bmb value of the output signal through the channel from the vibration sensor unit at the initial moment of purging on the characteristic melt, mA, then the channel from the vibration sensor unit 8 is healthy and PJ 1.

When using the device, the following situations are possible:

inequality (1) is not fulfilled and inequality (2) is fulfilled, this corresponds to the fact that the channel from the microphone sensor unit} is healthy and P, 1, and the channel from the vibration sensor unit 8 is faulty and

Inequalities (1) and .. (2) are not satisfied, this corresponds to the fact that both channels are intact and P ,, 5;

the inequality (1) and (2) is fulfilled, it corresponds to the fact that both channels are faulty and R, that oz

the failure of the entire device begins, however, such a situation, corresponding to the simultaneous failure of two channels, occurs almost rarely, i.e. The reliability of the slag level control in the converter in the proposed device is significantly higher than in the known technical solutions with a single channel,,

Thus, the presence of two information channels from the microphone sensor unit and the vibration sensor unit increases the reliability of the level control

ten

by means of a throttling device 24 in such a way that the greatest excess pressure (about 1-10 Pa) is created in the waveguide 21 relative to the pressure of the exhaust gases in the converter gas flow, preventing the penetration of flame, converter gases and fine dust into the waveguide. As a result, the waveguide 21 itself during the whole melting is filled with a homogeneous composition of neutral gas, which provides the strength of the basic physical parameters

slag in the converter, since the failure of one-15 (composition, temperature, etc.) of the medium in

of the channels does not lead to the loss of performance of the device for controlling the level of the pshak in the converter.

The output of the microprocessor control unit 19 receives a signal proportional to the current value of the slag level in the converter, which is fed to the input of the recording device 20,

At the time of the end-melting, when the contacts are de-energized, the relay of the oxygen oxygen check valve blows at the first time relay 18, a signal s appears corresponding to W-O, which is fed to the sixth input of the microprocessor control unit 19, which causes the current calculation to stop. the level of the pin in the converter, at the same time at the time of the end of melting at the second output of the time relay 18, a signal corresponding to 1 is sent, at which the valve 25 opens at the electrical input of the valve 25 with an electromagnetic drive; a compressed neutral gas gistral with a sound pressure sensor unit 22 and an acoustic waveguide 21 that receives neutral gas at a pressure of 0-2.0 0.6 ML for 15-40 s, cleaning their internal surfaces from large particles of dust that have settled there, during smelting, this dust is carried away into the flue gas duct, and automatic cleaning is achieved.

At the same time, the internal surfaces of the sound pressure sensor unit 22 and the waveguide 21 are continuously flushed with neutral gas through the bypass channel 26 from the compressed neutral gas line, both during melting and during the inter-winding period, through the bypass channel 26 with a throttling device.

, „

by means of a throttling device 24 in such a way that the greatest excess pressure (about 1-10 Pa) is created in waveguide 21 relative to the pressure of flue gases in the converter flue, preventing the penetration of flame, converter gases and fine dust into the waveguide. As a result, the waveguide 21 itself during the entire melting is filled with a homogeneous composition of neutral gas, which provides the strength of the basic physical parameters

20

25-zo, j.

.

45

50

Pz

14-sb 0

P P wave guide, defining its resonant properties, i, e. The waveguide frequency response remains constant throughout the heat.

Slag level control in the converter using the device is based on the following theoretical assumptions.

The level of the acoustic signal of the process is determined by the equation

ABOUT

l-exp - (H-Z) / i,, with ZfrH; , - (Mr.), with,

(3)

where P is the sound power of aerodynamic jet noise in any outflow mode; sound power aerodynamic noise of the jet at the initial moment of purging; sound power of the jet during its contact with the slag phase;

P is the sound power of aerodynamic noise of a jet at the moment of entering the cut-off section of a fury) into the slag-metal emulsion;

sound transmission coefficient from slag to flue gases; - ko4) slag absorption sound;

1, - sound attenuation coefficient. howling power in the cavity of the converter;

H - the position of the tuyere, m; Z - slag level in the converter bath, m

Decision (3) relative to the value of the slag level in the converter bath, we obtain

H

sh-g

 - In 1., with Z - H, (4)

15

those. for the case when the cutout of the tuyere nozzle is above the shpakometishky emulsion.

For the case of the buried cfpyH (the cut of the tuyere nozzles is in the slag-metal emulsion) from equation (3) we get

.-j-.ln -,, with. (five)

sh flu-r

Combining equations (4) and (5), we obtain the dependence for determining the level of slag in the converter

, 2.r (t) l /;

r95,52 + T5; 5T inLVoJtTJ

QV.

m /

... (t) i

(t) +

/ In 0.2.) /

§T785-TT753 in Vo rt7J

/ In 0,2-At) /

T5757 2723-iH v-rtT3

/ In 0, (t) l /

T5735-2728-inIVo7t7 V

where) is the level of slag in the converter, determined from information from the sound pressure sensor, m;

35

(t) .- current value of oxygen lance, m; before

QK /

I (t) is the current value of the output signal through the channel from the sound pressure sensor, mA;

(t) —the current value of the potential difference between the tuyere and the casing of the vessel; it may take the values 1U (1) 0, corresponding to the mode

covered jet, and and 1, corresponding to the bench press deepened with Rewriting the equation (7 / s

Vg (t) - the current value of the flow. eat coefficients ao, &, b, b,,

oxygen blowing, nm / min; with

oh, c, do, d ,, 1, and ij, get

177516

Using equation (6) to determine the slag level in the converter is considerably difficult due to the difficulty of measuring the parameters of the aerodynamic noise of the oxygen jet, such as P, -Rd, P, PO, and determining the coefficients p, ... multi-data method

For the conditions of the oxygen-converting shop, the conditions of a similar regression analysis have been obtained, similar in structure to equation (6)

5 of calculating the slag level in the converter based on the information coming through the channel from the sound pressure sensor, as well as information on the current oxygen consumption to blow and the position of the oxygen tuyere

, with and (t) i 1

-th

and (t) i

H (t) 5: 2.2

-f-to

and (t) 1

,, (- t) 2.2

) H (t) 1.9

(7)

(t) is the current value of the potential difference between the tuyere and the converter housing, can take the values 1U (1) 0, corresponding to the mode from

covered jet, and and lt; 1, corresponding to the mode of the submerged jet. By rewriting the equation (7 / s for introducing the coefficients ao, &, b, b,

oh, c, do, d ,, 1, and ij, we get

17

It is known that the vibration of the converter housing is analogous to the noise level. Therefore, by processing the experimental data by the method of multivariate regression analysis for the conditions of the oxygen converter shop, we obtained similar structures throughout the structure.

(t) /

To equation (6), the equation of the slag level in the basis of information, on the basis of the vibration sensor, the current consumption and position of the sour

H: :( t)

, 2-i,.

-7; 5T 5; sT iniVo rtT5

 flntO, 2-f (t) /

39; s3 5772 intVo7tT

with and (t)

H (t) +.

h

, 2.) L /

u (t) 1

P "| H (t) 2.0) 1

 - / i i /

-z: o5-o7zGSChUo; P7z P lH (t) 2.0

C (t)

the value of the slag level 20 in the converter, determined by the information m. from the sound pressure sensor,

eiB u,. (t), 2.f (t) l /

i; + i7 iH Vo7tT3

, 2.f (t) (

f; + fr in Vo7t7j

at and

Htp (t) +

, 2.r ° (t) /

i; + iT inLv Tt7J

during converter melting as the level of slag in the converter increases, the intensity of the noise, as well as the amplitude of vibration of the converter housing

The determination of the purge modes is based on the registration of the time when the cut-off nozzle of the oxygen tuyere enters the slag-metal emulsion. If the oxygen tuyere nozzle is found, the Q is reduced. However, the presence in common ground with slag-metal emulsion, in the converter of a wide-spectrum noise, this corresponds to the open mobile noise mode, and it increases the jet. If the cutout nozzle for the oxygen-distorted output signal from the block lance is located in the slalom- etch-microphone sensor, especially with an emulsion, this corresponds to a highly foamed slag, which deprives the bench of its buried jet of reliability. In addition, the following physical phenomenon was used to determine the time when the nozzle section of the oxygen tuyere was cut into the metal-slag emulsion. At the time of entering the nozzle of the oxygen tuyere into the slag-metal emulsion, an electric circuit of the tuyere-earth-body-footers 50 is formed.

The intensity of the wide-spectrum noise of the seals depends on the magnitude of the pressure of the working gas or steam in the line and the degree of opening of the valve, i.e. it is not constant, therefore it is not possible to eliminate the effect of this interference on the output signal by introducing any constant bias.

ka-melt-urma, through which electric current flows, which leads to the appearance of a potential difference in the section of the lance - Koprtyc converter circuit.

177518

re to equation (6) equations for calculating the slag level in the converter based on the information supplied by the cannister from the vibration sensor, as well as information on the current oxygen consumption to blow and the position of the oxygen tuyere

with and (t)

u (t) 1

| H (t) 2.0) 1

i /

lH (t) 2.0

(9)

I (t) is the current value of the output signal through the channel from the vibration sensor., MR., Rewriting this equation with the introduction of coefficients 1, 1 ,, f, f,,

So 5 64 5 Si j we get

at and (t) 1

V-Vt) i

) 5 S,

) 1 H (ty s,

(ten)

during converter melting as the level of slag in the converter increases, the intensity of the noise, as well as the amplitude of vibration of the converter housing

reduced. However, the presence of a wide-spectrum noise disturbance in the converter's general circuit leads to an increase and distortion of the output signal from the microphone sensor unit, especially with heavily foamed slag, which deprives it of its reliability. In addition,

The intensity of the wide-spectrum noise of the seals depends on the magnitude of the pressure of the working gas or steam in the line and the degree of opening of the valve, i.e. it is not constant, therefore it is not possible to eliminate the effect of this interference on the output signal by introducing any constant bias.

In the device, the channel of the microphone sensor unit changes the magnitude of the noise interference compensation signal in proportion to the intensity

191421775

the interference itself, thus completely eliminating its effect on the channel output from the sound pressure sensor. During operation, the mechanical equipment of the workshop is a source of vibrations that can be transmitted to the converter housing and leads to an increase and distortion of the output signal of the vibration sensor, and especially with heavily foamed slag, the accuracy of controlling the level of the drive in the converter is reduced.

In the device channel from the block

vibration sensor, the magnitude of the interference signal, g of the temporal changes in the consumption of oxygen-generating during operation of mechanical equipment, varies in proportion to the intensity of the interference itself, i.e. completely excluding its effect on the output signal through the channel from the vibration sensor.

The presence of two information channels from the microphone sensor unit and the vibration sensor increases the reliability of slag level control in the converter. Indeed, the failure of one of the channels does not lead to a loss of the device’s operability to control the slag level in the converter.

Experimental studies carried out in the oxygen converter shop showed that taking into account the effect of changing the position of the tuyere and blowing intensity, as well as taking into account the effect of interference, improves the accuracy of slag level control in the converter.

In tab. Figure 1 shows the results of experimental studies on experimental smelting during short-term discrete changes in the position of the oxygen tuyere at a relatively constant level of slag in the converter and a constant consumption of oxygen blowing.

Table 1

20

25

thirty

35

40

45

Yes, blow with a relatively constant level of slag in the converter and a constant position of the oxygen tuyere.

A short-term change in the oxygen consumption by blowing at a relatively constant level of slag in the converter and the constant position of the oxygen tuyere leads to a change in the output signals from both the microphone sensor unit and the vibration sensor unit. Consequently, taking into account the effect of changes in the oxygen consumption by blowing along the blowing process increases the accuracy of slag level control in the converter.

Table 2

The results of experimental studies on pilot melts confirmed that the accuracy of control of the slag level in the converter by the proposed device is higher than known, since the residual root-mean-square deviation of the measurement results using the proposed device

Short-term discrete change in the position of the oxygen tuyere

20

with a relatively constant level of slag in the converter and a constant consumption of oxygen, blowing causes a change in the input signals from both the microphone sensor unit and the vibration sensor unit. Therefore, taking into account the effect of changing the position of the oxygen tuyere during the purging process increases the accuracy of controlling the slag level in the converter.

In tab. 2 shows the results of experimental studies on experimental smelting during a brief

Yes, blow with a relatively constant level of slag in the converter and a constant position of the oxygen tuyere.

A short-term change in the oxygen consumption by blowing at a relatively constant level of slag in the converter and the constant position of the oxygen tuyere leads to a change in the output signals from both the microphone sensor unit and the vibration sensor unit. Consequently, taking into account the effect of changes in the oxygen consumption by blowing along the blowing process increases the accuracy of slag level control in the converter.

Table 2

35

40

The results of experimental studies on pilot melts confirmed that the accuracy of control of the slag level in the converter by the proposed device is higher than known, since the residual root-mean-square deviation of the measurement results using the proposed device

0.58 m less compared with the known device.

Thus, taking into account these factors, it follows that the signal obtained at the output of the proposed device (Fig. 6, curve 42) allows

determine the slag level in the converter as close as possible to its true value (Fig. 6, curve 43). Received

21

Slag level values by means of a known device (Fig. 6, curve 44) are significantly different from tHHHoro.

The technical efficiency of using the proposed CjOCTOHT device is that it allows you to control the process of pshak formation at the expense of increasing the accuracy and reliability of controlling the slag level in the converter. In turn, the optimal flow of the slag formation allows you to reduce losses metal emissions and highs, ie, increase the yield.

Formula of the invention

A device for controlling the slag level in the converter, including a microphone unit with an inert gas gas blowing unit, a preamplifier, a frequency selective amplifier, a detector, a voltage converter, a recording device, the output of the microphone unit with an inert gas blowing system with an inert gas is connected by the entrance

14

A preamplifier amplifier, the output of which is connected to the input of the frequency-selective interface, and the output of the latter is connected to the input of the detector, which is different in that, in order to improve the accuracy and reliability of slag level control in the converter, two blocks of dynamic noise compensation are introduced into it , two adders, vibration sensor unit, second pre-amplifier, second frequency - iHo-selective amplifier, second detector, second voltage converter - current oxygen flow meter

-

ten

15

20

,

42177522

blow, the blowdown mode detection unit, the tuyere position control unit, the time relay and the microprocessor control unit, the preamplifier output is connected to the input of the dynamic noise compensation unit, the output of which is connected to the second input of the first adder, the first input of the first adder, is connected to the detector output, the output of the first adder is through a voltage converter, the current is connected to the first input of the microprocessor control unit, the output of the vibration sensor unit is connected to the input of the second preliminary voltage ilitel whose output is connected both to the input of the second cha-. the cost-selective amplifier and the second block of dynamic noise compensation, the output of which is connected to the second input of the second adder, the output of the second frequency-selective amplifier is connected to the input of the second detector, the output of which is connected to the first input of the second adder, the output of the second adder current - the current, the output of which is connected to the second input of the microprocessor-based scanning unit, with the third, fourth, fifth and sixth inputs of which are connected respectively to the outputs of the unit determining the purge mode, oxygen flow meter blowing, lance position control unit, and also the first time relay output, the second output of which is connected to the input of the microphone sensor unit, to the waveguide blowing element with an inert gas, and the output of the microprocessor control unit is connected to the recording device.

25

thirty

35

40

g

-f

K1

5} 1Z

H

fD1

VSl

Cf

l /

 ffam

fig.z

cS

y

VS3

- “W

-Wr-g

i.

/ 74and

FIG L

Kvnvts melting

Claims (1)

Formula invented A device for controlling the slag level in the converter, including a microphone unit with an inert gas blowing element, a pre-amplifier, a frequency-selective amplifier, a detector, a voltage-current converter, a recording device, and the output of the microphone block with the inert gas blowing device connected to the Pre input an amplifier, the output of which is connected to the input of a frequency-selective amplifier, and the output of the latter is connected to the input of the detector, which is cast in order to increase the accuracy type and reliability of the slag level control in the converter, two dynamic noise compensation units, two adders, a vibration sensor unit, a second pre-amplifier, a second frequency, but-selective amplifier, a second detector, a second voltage-current converter, an oxygen flow meter are introduced into it 1421775 22 air blast, purge mode determination unit, tuyere position control unit, time relay and microprocessor control unit, the output of the pre-amplifier connected to the input of the dynamic noise compensation unit, the output of which is connected to the second input of the first adder, the περί input of the first adder is connected to the detector output, the output of the first adder through the voltage - converter, the current is connected to the first input of the microprocessor control unit, the output of the vibration sensor unit is connected to the input of the second preliminary amplifier whose output is connected both to the input of the second cha-. a frequency-selective amplifier and I of the second block of dynamic noise compensation, the output of which is connected to the second input of the second adder, the output of the second frequency-selective amplifier is connected to the input of the second detector, the output of which is connected to the first input of the second adder, the output of the second adder is connected to the input of the second converter voltage - current, the output of which is connected to the second input of the microprocessor control unit, with the third, fourth, fifth and sixth inputs of which the outputs of the unit the distribution of the purge mode, the oxygen flow meter of the blast, the lance position control unit, and the first output of the time relay, the second output of which is connected to the input of the microphone sensor unit, with an inert gas element, and the output of the microprocessor control unit is connected to the input of the recording device. FIG. 2