SU977503A1 - Device for determining moment of tilting converter - Google Patents

Description

(54) DEVICE FOR IDENTIFYING / VIOMEHTA CONVERTER PANELS

one

This invention relates to ferrous metallurgy and can be used to control converter smelting.

A device for determining the moment of converter turning is known, which contains a generator of chemical composition of cast iron, controls of chemical composition of slag, mass and chemical composition of ore, the outputs of which are connected to the inputs of the computing device.

The operation of the device is based on the fact that the moment of turning the converter is determined when equality of the amount of oxygen actually used for smelting to its calculated value is achieved. At the same time, the calculated value of the amount of oxygen is determined depending on the chemical composition of the pig iron, the mass of the ore, taking into account the amount of oxygen spent on the oxidation of iron 1.

The drawback of the device is the low accuracy of determining the converter turning point, which is caused by the insufficient accuracy of determining the oxygen consumption due to the fact that, when calculating / og. R does not take into account a number of factors, in particular the position of the tuyere, the intensity of the purge. As a result, the converter roll may be

produced when the content of carbon is not equal to the specified.

The closest to the proposed technical essence and the achieved result is a device for determining the moment of poking of the converter. The device contains a flow measurement unit blowing, an integrator, a gassing intensity sensor, a gassing intensity measuring unit, a pulse counter with an output transducer, a gassing intensity measurement unit 10, a blowing time determining unit, a dividing unit, a final carbon content setting unit, a predetermined amount of oxygen determining unit unit of comparison. The output of the flow measurement unit through the integrator is connected with the output of the unit for determining a predetermined amount of oxygen, the input of which is connected with the output of the setter for the final carbon content. Gassing intensity sensor output

20 is connected to the gassing intensity measuring unit, the output of which is connected to the gassing intensity measurement unit, and the output of the latter is connected to the input of a pulse counter, the output of which is connected to one input of the division unit, to another input of which the blowing time detection unit is connected, and the output of the unit the division is connected to the input of the unit for determining a predetermined amount of oxygen-2.3. A disadvantage of the known device is that the determination of the moment of turning the converter converter vodits with insufficient accuracy due to systematic errors when determining the intensity of the gas evolution and oxygen consumption. The purpose of the invention is to improve the accuracy of determining the moment of povalki converter. The goal is achieved by the fact that the device for determining the converter poker time, which contains the purge time detection unit, the gassing intensity sensor, the gassing intensity measurement unit, the gassing frequency measurement unit, the pulse counter and the dividing unit, the flow measurement unit, the first integrator , the final carbon content setting unit, the first comparison unit, the output of the blowdown time determining unit is connected to the second input of the first unit and dividing, a synchronization unit, a first key in series, a first storage unit, a second comparison unit, a first scaling unit and a first summation unit, a series of actual carbon content measuring unit, a first oxygen adjustment unit, a third comparison unit, a fourth comparison unit , fifth comparison block, second scaling block, second summation block, second key and second memory block, third and fourth keys, third and fourth memory blocks, second and third blocks oxygen consumption adjustments, a basic carbon setting unit, the output of the first dividing unit is connected to the input of the first key and the second input of the second comparison unit, the output of the synchronization unit is connected to the additional inputs of the first, second, third and fourth keys, the output of the consumption measuring unit is blown through the first integrator, the third key and the third storage unit with the second input of the third comparison unit, the output of the first integrator is connected to the first input of the first comparison unit, the second input of which is Connected to the output of the first summation unit, the output of the actual carbon content measuring unit is connected to the first input of the second oxygen flow adjustment unit, the second input of which is connected to the output of the final carbon content setting unit, and the output to the second input of the fourth comparison unit, the output of the task set to the final content carbon is connected via the fourth key and the fourth memory block to the second input of the first oxygen consumption adjustment block, the output of the basic carbon content setting block is with the second input of the third oxygen flow adjustment unit, the first input of which is connected to the output of the final carbon content setting unit, and the output to the second input of the first summation unit, the output of the second memory unit is connected to the third input of the first summation unit, the second input of the fifth unit comparison and the second input of the second summation block. Each oxygen consumption adjustment unit contains a constant signal setting unit, a sixth comparison unit, a first multiplication unit, a third scaling unit, a third summation unit, a second dividing unit and a second multiplication unit, the second input of which is connected to the output of the generic comparison unit, and the output is the output of the oxygen consumption adjustment block, the output of the constant signal setting block is connected to the second input of the third summation block, the output of the first multiplication block is connected to the second input of the second th block dividing, the first and second inputs of the first multiplier unit are connected respectively to the first and second inputs of the sixth and the comparator are the first and second inputs of the block correction oxygen consumption. FIG. 1 shows a diagram of the device for determining the moment of turning the converter; in fig. 2 - block diagram of the adjustment of oxygen consumption. The device for determining the converter turning moment contains a gassing intensity sensor 1, a gassing intensity measuring unit 2, a gassing intensity change frequency measuring unit 3, a pulse counter 4, a purge time determining unit 5, a first dividing unit 6, a synchronization unit 7, the first key 8, the first memory unit 9, second comparison unit 10, first AND scaling unit, flow measuring unit 12 blowing, first integrator 13, third key 14, third memory block 15, actual carbon content measuring unit 16 Water, final carbon content setting unit 17, fourth key 18, fourth memory unit 19, first flow adjustment unit 20, oxygen, third comparison unit 21, basic carbon content setting unit 22, second oxygen consumption adjustment unit 23, third adjustment unit 24 oxygen consumption, the fourth comparison block 25, the fifth comparison block 26, the second scaling block 27, the second summation block 28, the second key 29, the second

a memory unit 30, a first summation unit 31, a first comparison unit 32, a first multiplication unit 33, a third scaling unit 34, a third summation unit 35, a second division unit 36, a second multiplication unit 37, a sixth comparison unit 38, a constant setting unit 39 signal.

The device for determining the converter turning moment works in the following way.

The carbon content in the steel C (i) is signaled to the current i-th heat from the final carbon content setting block 17 through the fourth key 18 to the input of the fourth memory block 19, where it is remembered for the time before the next melt is blown. The fourth key 18 is turned on by a signal from the output of the synchronization unit 7 at the time of the start of the purge. The signal C (i - 1) stored in the fourth memory block 19 is fed to the second input of the first oxygen consumption adjustment unit 20. The second input of block 20 is given a signal from block 16 about the actual carbon content C (i - 1) at the first povalka of the smelting passed.

In the first block 20 (Fig. 2), the corrected oxygen consumption is calculated by the formula

c4i-l) /4Q.(i-l) g,) - CU-L) + a.

 CCi-0-C (i-l),

where AQ. (i - 1) is the adjusted oxygen consumption for (i - 1st) smelting;

С (1 -)) and SS-0-specified and actually obtained carbon content on the first putter; .a, and a-experimentally selectable coefficients, for example, for a 300-ton converter and 2800; aa 33.

The signals of C (i - 1) and C (i - 1) are fed to the inputs of the first multiplication unit 33. The signal from the output of the first multiplication unit 33 is fed through the third scaling unit 34, where it is multiplied by the amount Oi, to the first input of the third adder 35, the second input of which receives a signal from the output of the constant-signal setting unit 39. In the second division unit 36, a signal C (i-1) C (i-1) is outputted from the output of the first multiplication unit 33 and is divided into a signal from the output of the third addition unit 35. In the sixth comparison unit 38, the signal C (i - 1) is subtracted from the signal C (i-1) and the signal of the difference obtained is fed to the input of the second multiplication unit 37, where it is multiplied by the output of the second division unit 36.

The signal about the current oxygen consumption q from the output of block 12 goes to the integrator 13, where the total amount of oxygen consumed for purging - Q (t) (t is the current time) is determined. At the time of the end of the purge, the third key 14 is closed by the signal of the synchronization unit 7 and the signal Q (i) is fed to the input of the third memory block 15, where it is stored for the time before the end of the next melt.

The output signal Q (i - 1) of the third memory block 15 is fed to the input of the third comparison unit 21, where the signal AQ (i - 1) is output from the output of the first oxygen consumption adjustment unit 20. The result is a signal of an ideal flow of oxygen Q (i -1)

u (i-n aCi-n-AQ.Ci-l), i.e. such an amount of oxygen that would have to be purged on the past smelting in order to obtain the actual carbon content on the first roll, equal to the specified value.

0

The signals on the carbon content from block 16 and the baseline, in particular, on average, on the first rolls, the carbon content from block 22, are received in the second block 23 for adjusting the oxygen consumption.

5 The structure of that block is the same as the first block 20 adjusting the oxygen consumption. In block 23, the second corrected value of oxygen consumption is calculated by the formula

0

one

 c -cd-D,

AQ2 (

dj + ca-i) -c

Where c is the base value of the carbon content is selected under specific conditions, in particular, as the average value of the carbon content on the first shovels; ai 2800; 02 35 for a 300 ton converter.

Signal of the received adjustment

Q2 (i - 1) enters the fourth block 25

comparison, where is subtracted from the signal about

Q (i-1) coming from the third block 21

compare

Q Ci-l) Q. (i-l) -Aa2 (i-l}

Thus, in block 25, the ideal oxygen consumption reduced to the base carbon content is determined, reflecting the effects of all uncontrolled disturbances. This operation is necessary in order to make the temporal sequence composed of the values of ideal oxygen consumption for smelting smoother and more convenient for extrapolation.

The signal about (i - 1) is extrapolated for one heat by an extrapolator made using blocks 26-30 and implementing the exponential smoothing procedure.

Claims (2)

Q, Un) x.) (I-2) a4i) (iI), - I), (i-2) -smooth values of the reduced oxygen consumption in (i - 1) -and and (i-2) s ; about. - the smoothing coefficient is refined for specific conditions in the range of 0.1-0.5; Q (i) is an extrapolated reduced oxygen consumption. To obtain a signal, the output signal of the fourth comparator unit 25 is input to the fifth comparative unit 26, where the output signal of the second memory unit 30 is subtracted from it. The received difference signal in the second scaling unit 27 is multiplied by a factor ot and fed to the second addition unit 28, where it is added to the signal Q (i-2) from the output of the second storage unit 30. Through the second key 29, which is turned on at the moment of the end of the purge, the signal of the synchronization unit 7, the signal from the output of the second summation unit 28 is fed to the second memory unit 30, where it is stored until the end of the next melt purge. The signal about the specified final carbon content on the i-y melting from block 17 and on the baso-BOM carbon content from block 22 enters the third oxygen adjustment block 24, the structure of which is similar to the structure of the first oxygen adjustment block 20. In block 24, the third corrected value of the oxygen consumption by the formula (i) is recorded, AQjCn СЧО-с where ai 2800, for a 300-ton converter. The 4Qj (i) correction obtained in block 24 is summed up in block 31 with the extrapolated reduced oxygen consumption, and thus the extrapolated reduced oxygen consumption is recalculated to the carbon content of the current melt. In addition, in block 31, the adjustment of the flow rate AQ () is summed up, which is based on the rate of change in the gassing intensity as follows. Information on gassing intensity comes from sensor 1 to gassing intensity measuring unit 2, and then to gassing intensity changing unit 3 and pulse counter 4, the output of which corresponds to the integral of gassing intensity. In dividing unit 6, the signal coming from counter 4 is divided into a signal about the duration of the sweep time coming from unit 5, as a result of which the output of unit 6 yields the average value of the frequency of the fission gas intensity. The signal of this frequency is fed through the first key 8 to the first memory block 9 and stored for one heat, and then in the second comparison block 10 is subtracted from the current average frequency coming from the output of block 6. The resulting difference goes to block 11, where y is. multiplied by a constant coefficient Cj. At the output of the block, an adjustment of the oxygen consumption 4Q4 (i) is obtained on the basis of the frequency of gassing intensity change according to the formula AQ (i) C, (i) -f (il) where 1d5 Hf (j ,, -4 is, respectively, the average current frequency of gas release intensity i th melting and average frequency of gas emission at a benign (i - 1) - and melting; C1 is a conversion factor from the range of 1000-5000, specified for specific conditions. The introduction of the AQ correction (i) is due to the fact that the ideal oxygen consumption on the melted melt found with intensity programs implemented on smelting oxygen supply, bulk materials supply, tuyere positions, etc. The current i-th city hall of the listed departments may have different settings, therefore, the oxygen consumption must be adjusted according to the difference between the control programs in the good and the current melting; programs and is the difference in the frequency of gassing intensity in the blanket and current melting. The use of the proposed device instead of the known increases the accuracy of determining the moment of the converter pusher on a given content carbon and approximately 10% due to the fact that introduced blocks incorporating information about previous batches, which in turn allows to assess the effects of uncontrolled disturbances and extrapolate them to compensate Representat conductive smelting. Claim 1. Device for detecting converter converter turning moment, comprising a purge time detecting unit, successively activating a gassing intensity sensor, a gassing intensity measuring unit, a frequency measuring unit gassing intensity, pulse counter and dividing unit, flow measuring unit blowing, integrator, final carbon content specifying unit, first comparison unit, output of the blowdown time determining unit connected to the second input of the first dividing unit, characterized in that the moment of converter turning, a synchronization block is inserted in it, the first key, the first memory block, the second comparison block, the first scaling block and the first summation block, the sequence Included are the actual carbon content measurement unit, the first oxygen consumption adjustment unit, the third comparison unit, the fourth comparison unit, the fifth comparison unit, the second scaling unit, the second summation unit, the second key and the second memory block, the third and fourth keys, the third and the fourth memory blocks, the second and third oxygen consumption adjustment blocks, the basic carbon content setting block, the output of the first dividing unit being connected to the input of the first key and the second input of the second comparison unit, the output The synchronization unit is connected to the additional inputs of the first, second, third and fourth keys, the output of the flow measurement unit is connected through an integrator, a third key and a third memory unit to the second input of the third comparison unit, the integrator output is connected to the first input of the first comparison unit, the second input which is connected to the output of the first summation unit, the output of the actual carbon content measurement unit is connected to the first input of the second oxygen flow adjustment unit, the second input of which is connected to the output of block specifying final carbon content, and the output - to the second input of the fourth comparison unit specifying unit output end the carbon content is connected through the fourth key and the fourth memory block to the second input of the first oxygen consumption adjustment unit; the output of the basic carbon content setting unit is connected to the second input of the third oxygen consumption adjustment unit, the first input of which is connected to the output of the final carbon content setting unit, and - to the second input of the first block the summation, the output of the second memory unit is connected to the third input of the first summation unit, the second input of the fifth comparator unit and the second input of the summation unit. 2. The device according to claim 1, characterized by the fact that the oxygen consumption adjustment unit comprises a constant signal setting unit, a sixth comparison unit, a first multiplication unit connected in series, a third scaling unit, a third summation unit, a second division unit and a second multiplication unit, the second input of which is connected to the output of the sixth comparison unit, and the output is the output, the oxygen consumption adjustment unit, the output of the constant signal setting unit 5 is connected to the second input of the third summation unit, the output of the first multiplication unit is to the second input of the second division unit, and the first and second inputs of the first multiplication unit are connected respectively to the first and second inputs of the sixth comparison unit and are the first and second oxygen correction unit . Sources of information, 5prints in the consideration 1.Turgenich DI. Management of melting steel in the converter. M., “Metallurgists, 1971, p. 94-97. 2. USSR author's certificate number 330195, cl. C 21 C 5/30, 1970.