SU737467A1 - Device for steel smelting control in convertor - Google Patents

Description

(54) CONSTRUCTION STEEL MANAGEMENT DEVICE

The invention relates to the field of ferrous metallurgy, namely to converter steel production; A melting steel control device is known based on the continuous measurement of its weight, in which several tens of flatness sensors are used, installed in the trunnion supports. When loading a conveyor, the weight of all the individual components of the charge is recorded, the amount of MOtX5 shpak and metal is drained, and during the process of melting A continuous recording of the rate of change of weight 1 is carried out. An undersupply of such a device is the installation of a pin on several sensors, for example, eight, which evenly apply the weight of the converter to measuring devices ri weighing accuracy, and also complicates the connection of strain gauges in the measuring circuit. Also known are devices for automatically controlling the purging process in a converter, predisposing and melting parameters of steel in my steel and consisting of a set of blocks for measuring parameters of iron, initial and predetermined conditions for purging, computational calculations for calculating the charge, determining carbon content, temperature, slag basicity and other parameters. Such devices also include executive units for controlling the flow rate of oxygen, the position of the tuyere, and the dosing of bulk materials. A disadvantage of the device is the lack of units for preventing emissions in the stock-smelting bath and, directly, affecting the smelting process by generating corrective signals for the flow rates of the bulk oxygen, position. tuyeres. The purpose of the invention is to prevent emissions and increase the yield of the year. To achieve this goal, a control unit for fusible steel in a converter containing control units for oxygen consumption, tuyere position and batching of bulk materials, the inputs of which are connected to an input unit for smelting the initial and predetermined purge conditions, further includes digital storage devices for calculating on the go melting Values of the temperature of the reaction zone and changes in the weight of the melt, and these devices are connected to each other in accordance with the European triple sensors / in supporting bearings and to the peakttHb temperature sensor integrated in the water-cooled azide; and the outputs to the blocks comparing the current and specified values of the temperature of the reaction zone and the change in the weight of the melt; The device also contains a logic block for forming correction signals, whose inputs are connected to the outputs of the comparison blocks, and the outputs through the executive commutator are connected to the control units for oxygen flow, the position of the tuyere and the dosing of bulk materials, the Logic block consists of two elements of coincidence , a trigger and an enac analysis block, with the output of the character analysis block connected to a trigger, the output of which is connected to two inputs of the matching elements, the second input of which is connected to the comparison blocks, and the second outputs of the blocks no par veShyNonY with two ohdy1mi oy9: signs and analysis. The switch consists of six blocks of coincidence, six multiplying blocks of two adders and two buses, the buses are connected to one input of the matching blocks, and the outputs from the logical block are connected to the other inputs of these elements; the outputs of the six blocks are a match. through six multiplying units are connected respectively with two adders included in the switchboard and three units for controlling the flow and position of the tuyere, - FIG. 1 is a block diagram of the fusible steel control device in the converter; FIG. 2 is a block diagram computing device for forming corrective actions; The control flowchart includes a control object — an oxygen converter 1 with a water-cooled tuyere 2 blow. Suspended air cooler sbd sat. 1 g of a temperature sensor provides a measurement of the temperature of the reaction zone, the first temperature of the reaction zone is measured using color, radiation and other thermoelectric pyrometers. The converter shafts are installed in radial bearings 4. Weight sensors are built into the base of the bearing — massdose 5, Sensor 3 and 5 outputs are connected to the main hydraulic blocks in blocks b and 7, where the corresponding temperature values are kept. reactionary and bblEsti change the weight of the melt, taking into account the probabilistic characteristics of the object-converter. Blocks b and 7 syediyechy with blocks 3 and

717467 9 Comparison of the specified and calculated sums of the values of the above parameters. The smelter control unit also includes a logic unit 10 for generating corrective actions based on the calculation of envlh along the melting point of the temperature zone and the rate of change of the melt weight, the executive switch 11, the outputs of which depend on the melting time and formed in the logic unit corrected actions through the keys are connected to the oxygen consumption control unit 12, the tuyere position control unit 13 of the ore consumption, lime control, lime control unit 14. The outputs of blocks 12-14 are connected to the respective actuators 15-17, and the inputs of these blocks are connected to the master block 18. In the block diagram of the computing device to form corrective actions (see, Fig 2), the outputs of the sensor 3 and the meter 5 are connected to analog-to-digital converters ADC and ADCP / which, in turn, are connected via valves C and C to the inputs of reversible counters and / those included in blocks b and 7, Valves C and Cn are designed to block the input of signals from sensors at a certain timentervale when applying flux materials in the converter. ,, In blocks b and 7, reversible counters are serially connected and provide, by overwriting, the memorization of the values of p and T in the fh-11th and rb-2) control steps. The connection of blocks b with 8 and 7 with 9 is accomplished by connecting the outputs of reversible counters to the inputs of the adders CM and CM 2 through blocks multiplying by the coefficients L;) I 0 (, ng PJ, 3. Summers CM and SMd are used to sum the values of weight changes melt l P and temperature of the reaction zone T with coefficients ol ;, - and p - RE in TeKSoneM, steps. The software tasks blocks VP and BP2 through the registers P and P have parallel binary input and are connected respectively with summators. CM and CMj, where A comparison is made of the digital values of f T. and the current forms Pj, Tp, and Tjg are statistically given curves for the critical values of these parameters, when the smelting mode is predisposed, to emissions. TK curves are determined by statistical processing of experimental data;

The connection of the blocks 8 and 9 of the comparison with the logical block 10 is carried out by connecting the outputs of the adders CM and CMg, respectively, to the first inputs of the matching elements CHj and SP ,.

The sign bits of the SM and SM are connected to the inputs of the character analysis block (BAZ), the output of which is connected to the second inputs of the joint venture and the joint venture through a trigger T,

The connection of the logic unit 10 with the execution switch 11 is realized by connecting the outputs CTIj and SPZ to the buses t and -c,,. which, depending on the period melt, kn, provide switching with corrections / Chl s of corrective control actions for the oxygen consumption M or Mj, the position of the tuyere H and the flow of bulk materials L.

In switch 11, bus C and are connected to the same inputs of the matching elements. To the other inputs of the elements SPD-SP., And crTg, SPD are connected to the corresponding outputs of logic elements SP 2 and SP ,.

The control switch 11 is connected to the control blocks 12,13,14 - by connecting the outputs of the coincidence elements to the inputs of blocks 12, 13, 14 through blocks multiplied by the coefficients of the summation of signals according to the algorithms of the c-outputs of the logical circuits SPD-1 2 and.; also Jj and SP, - s is implemented with the help of adders CM and CM, which are connected to the inputs of the control units 13 and 14.

In the process of steel smelting, as a result of oxidation of impurities, the formation of a donut metal emulsion and the evolution of gases, the mass of the contents of the smelting bath changes, which is fixed by a mass dose of 5. At the same time, the temperature of the reaction zone changes, the current values of which are fixed by sensor 3, the signals from sensors 3 and 5 enter blocks b and 7, where, in reversible counters, their values are memorized in the current and previous (, steps. When fluxing materials enter the converter at a certain time interval, analog-digital the conversion is stopped, and changes in the temperature of the reaction zone and the weight of the melt in the converter do not enter blocks 6 and 7.

In block 9, more specifically in the adder CM, the memorized values of the change in the weight of the melt with certain weight coefficients are averaged by,

time interval of the order of a few seconds i.e.

 . ),

where RT is the average change in the weight of steel;

 - change the weight of the rasp; lava is the current fi-oM step;

,, “constant weight - - coefficients.

On the same time interval in block 8, more specifically in the CMj adder, the temperature values of the reaction zone VPvnn P2T n-A.Ttn-al. Are averaged.

The calculated estimates of the temperature of the reaction zone Tp and the rate of change of weight P in blocks 8 and 9 are compared with the programmed values, as a result of which we get the declination of the estimates

lv.) (),

where, Tjg are statistically given values of the rate of change of weight and temperature of the reaction zone;

K, weights. The resulting differences: are received by the team in a logical block 10, where, with the appropriate combination of characters and E, corrective signals are generated for oxygen consumption, the position of the tuyere, and the flow of bulk materials. These correction signals change the main control actions on the oxygen consumption q,, lime and spar, a, the position of the tuyere Nf, calculated in blocks 12, 13, 14.

Algorithms of logic block 10 are:

on the interval C - 0-25% of the time of steel smelting

  ABOUT, .,

 (,

if fe, jri} jt O, e, tn O, I 0, e-1p1 $ 0.

where ,,.

Vp

in the range of 2-25-100% of the melting time;

i g-1. oh if fe ,, o

 U g „-1, ,, pff o, ifN n1 o ,,

f-Re U1 ,,, dM

1-LRz9-P "; - P 1i

The division of the total time of the process of melting into two intervals is determined by the mode of oxidation of the melt in the melting early melting, In the first period —c, ovciicJreHHQ and manganese dominate, and the spa only forms, then, after 23 of the total melting time, the second period begins g in which the decarburization of the liquid metal reaches maximum saturation. If at the interval t: the curve of the change in the weight of the melt passes below the software-defined curve, then there has previously been the occurrence of high rates of decarburization, when slag has not yet formed. A tic situation when, leads to the removal of metal lining the tuyere and a decrease in the output of the solid. If the melt weight change curve is more than software-defined for this interval, then the active one — accumulation of iron oxide FeO — takes place. In this situation, when, and the estimate of the metal temperature is below a given value of p 0, an oxidative potential is created for the rapid oxidation of impurities, which is fraught with an emergency situation — removal of the metal with subsequent emissions. Therefore, for any deviations from a given program- According to the slag induction algorithm, portions of lime v, Inl-iH, and oxygen consumption are added to the slag, which reduces the likelihood of metal escapes. In the second interval of plating, in the course of active decarburization of the bath, when the slag, mainly Sporop I and Cl, a situation may arise again in which the decarburization rate rapidly increases, t, e. an active release of flue gases begins, in this case lowering the tuyere to a certain height, and reducing the oxygen consumption of the B. period of active latch. Neither the waste gases from the bath slows down the decarburization process and reduces the likelihood of emissions. Therefore, when a situation arises when the rate of change in the weight of the melt is greater than the specified 1 0, the lance is lowered to a certain height + L and the oxygen consumption is reduced. In the executive switch 11, depending on the heat interval t: or t: the correction signals M, M., Y, L multiplied by the coefficients / j (- / 5g, are received in blocks 12, 13, 14 where they are subtracted from the calculated control actions on the consumption of oxygen, the position of the tuyere, the flow of loose.

Claims (2)

737467 A computing device for forming corrective actions by working as follows: From sensors 4 and 5, the current values of the melt weight and temperature of the reaction zone are fed to analog-to-digital ADC / i and ADC drivers, where they are formed in the number of pulses P hl-P h -l} H. The impulse and punctured sequences are through the CL and CL valves, which block the further arrival of the impulse at a certain time interval for the supply of fluxing materials to the converter. Control signals for switching on K and K are supplied from the unit, 14 flow control rash-. sneeze materials. In the course of melting, the number of pulses and T (n goes to the reversible counters PC;, p and FC, respectively; if. Then at the beginning of each next control period b + 1J, b + 2 ... on command from the control unit (CU) number of pulses from and overwrites .c to and PCj,, and of the latter, respectively, they are overwritten into EC counters and,, Thus, at the beginning of each control interval, information is updated in reversible counters, and at the end of the current interval - summation in the adders CM and CM,. Recorded in PQp,, PCjc, and PC, PCjt, PCzt values P and L 1 {.til, n-l) - ,. The h-2 control periods are overwritten by coefficients multiplied by. and r. The BP and BPJ blocks form the programmatically specified parameter values that, on the command of the control unit, arrive in the current period n in the binary parallel code in the registers P and F. From the P and Pj registers, the Pz9 values of Tje n are overwritten by the parallel code into the adders CM and CMj, in which they are compared with the current values of the melting parameters PT and Tr. If the differences h О,, then the character analysis block triggers the trigger T, which, in turn, ensures the passage of pulses through the coincidence element of the SP and SP. The number of pulses passed through these elements corresponds to the differences i-RZCH RT h, written off from CM and CMj. Depending on the melting interval, the control pulse from the control unit is fed to the tire, or to the tire, t. The moment of switching from t to Cj is carried out from a certain threshold value of the carbon content in the ignition, measured by a direct method (thermal probe), or indirectly (analysis of waste pelvic). If a control pulse is applied to the bus ".", The elements SPd, Cllg, and SPy pass through certain elements of the pulse, multiplied by the respective coefficients, Y g "--X-X. (- VV i tT, p) In the adder CM, is the addition of -KifPj -R +). As a result, the shaping-mc corrective actions M | and N. Analogs, but when a control pulse is applied to x, the number of pulses MU li (P99 t) is formed and in the CM adder the sum L / JS PJ-J-PT) + b (Te9-Tr). Block 18 calculates the optimal control actions for the consumption of oxygen, bulk materials and the position of the tuyere and sends them to the corresponding control blocks 12, 13, 14, In turn, the correction signals M / (or M., N, L) These blocks are subtracted from the control actions. These are then fed to the actuators 15, 16, 17 in a corrected form, which reduces the likelihood of emissions in the converter unit. Formula 1: Fusible steel control device in an envelope re, containing control mechanisms, connected to them the appropriate control units for oxygen consumption, tuyere position and dosing of bulk materials, the inputs of which are connected to the unit, for the initial and specified purge smelting, in order to prevent emissions and magnification, output of it, it additionally contains die memory devices, weighing magnetoanazotropic sensors in support bearings, temperature sensor of the reaction zone in the water chiller . ten 7,37467 m of the zoid, current comparison units and setpoint temperature & Of the action zone and the weight change are split, the logic unit for generating correction signals, the executive switch, the inputs of digital storage devices are connected respectively to the weighted magnetically anisotropic sensors and to the temperature sensor of the reaction zone, and the outputs to the current temperature and programmed values of the reaction zone and changes in the weight of the melt; the inputs of the logic unit are connected to the outputs of the comparison units, and the outputs through the executive switch are connected to the flow control units m oxygen lance arrangement and dosing bulk materials. 2. A device according to claim 1, characterized in that the logic unit consists of two coincidence elements, a trigger and a character analysis unit, the output of the character analysis unit connected to a trigger, the output of which is connected to two inputs of the coincidence elements, the second input of which is connected to a comparison block, and the second outputs of the comparison blocks are connected to two inputs of the character analysis block. 3. The device according to Claim 1, which means that the switch consists of six blocks, a match, six multiplication blocks, two adders and two buses, with buses connected to one block input 11 and the other inputs of these elements are connected respectively exits from the logical block; the outputs of the six blocks of coincidence through six blocks of multiplication are connected respectively to two adders included in the switch / and three blocks to control the flow of oxygen, flow: Bulks and the position of the tuyere. Sources of information taken iBO attention in the examination. 1. Journal of Metols, 1974, 26 ,. 7, pp, 17-24. 2. USSR author's certificate No. 450834, C 21 C 5/30, 1974. 737467