SU857269A1 - Device for control of termination of convertor blasting - Google Patents

Description

The invention relates to computing technology, in particular, to control devices of the converter process, and can be used in the converter shops of metallurgical plants. A device is known for determining whether the gas stops blowing in an oxygen converter at a given carbon content in metal, which contains sensors for input and output parameters of the process, connected through potentiometric dividers with a power amplifier integrator, to the output of which I is connected to the decarbonation degree counter. This device solves the frequent problem of controlling the carbon content of si. The closest in technical essence is the control unit to stop the blowdown, containing blocks for controlling the carbon content and a given amount of it, connected to the comparator unit, the output of which is connected to the blowing unit AND the converter drive control unit. After the cessation of purging, a metal sample is taken for analysis, according to the results of which the smelting is re-purged (blown out) 2. A disadvantage of the known devices is the low productivity of the unit, since it causes large time losses. Intermediate converters of the converter for sampling and waiting for results chemical analysis. The purpose of the invention is to increase the productivity of the unit. This goal is achieved by the fact that a device containing carbon control units and a number of gas, connected to a comparator unit, the output of which is connected to the input unit of the purge unit, and a converter drive control unit, additionally contains a flame emission spectrum unit, characteristic spectral lines connected to a block of a given amount of carbon, three blocks AND, two blocks 8B, blocks or and delays, the output of the block by the presence of characteristic spectral lines connected to the first charge of the first block AND, Ora input of which is connected to the output 1fopuoka unit and through the first NOT unit with inputs of the second and third (and Mkzha; input spectrum control unit

Flame radiation is connected via a delay box with an output of the skid block, and the output is connected to the second input of the second AND block and through the second block E to the second input of the third AND block; the outputs of the first and third blocks AND via the OR block are connected to the drive control unit, and the output of the second one is connected to the input of the purge unit and the carbon control unit.

Introducing new blocks and connections between them allowsPRODUCTING the steel analysis by laser radiation spectrum immediately after stopping the blowing without converting the converter to take a sample, which allows not to delay the production time for these operations and conduct control in accordance with the goal,

The drawing shows a block diagram of a control device for stopping the converter purge.

The device comprises a comparison unit 1, a unit 2 of a given amount of carbon, a unit 3 of the presence of characteristic spectral lines, a delay unit 4, a content control unit 5. carbon block, block 6, block AND 7, block 8 for monitoring the emission spectrum of the flame, blocks AND 9, 10, block OR 11, block 12 for controlling the drive of the converter, tera, block 13 for purging, block NOT 14. The input of the compare block 1 is connected to the outputs of blocks 2 of a given amount of carbon and 5 controls the carbon content, and the output is at the inlet of the purge unit 13. The second output of block 2 of a given amount of carbon is connected to the input of block 3 of the presence of characteristic spectral lines. The output of the block 3 is connected to the input of the block 6 NOT and the first input of the block 7 I. The output of the block NOT b is connected to the first inputs of the blocks 9 and 10. The input of the block 4 delays is connected to the output of the purge block 13, which is also connected to the second input of the block And 7. The output of the delay unit 4 is connected to the input of the block 8 for monitoring the emission spectrum of the flame, the output of which is connected respectively via the block HE 14 and directly to the second inputs of the blocks. Both 9 and 10. The output of the block AND 9 is connected to the inputs of the block 13 of the purge and the block 5 of the carbon content control. The output of the AND 10 block is connected to the first input of the OR 11 block, the second input of which is connected to the output of the AND 7 block. The output of the block 11 is connected to the converter drive control block 12.

Unit 3 of the presence of characteristic spectral lines is, for example, a switch equipped with a scale, calibrated as a percentage of carbon, whose contact position corresponds to

ting the boundaries of regions with characteristic spectral lines. For example, for the conditions of the Yenakievo Metallurgical Plant, the contact position corresponds to 0.25%. When a given amount of carbon is set to 5 in block 2, the switch knob synchronously rotates. When the knob is turned on the carbon content above 0.25%, the contact is closed, when the carbon content below 0.25 is open.

The carbon content control unit 5 contains sensors for input and output parameters, a power amplifier, a reference resolution node, an adder, an indicator, special points for determining the characteristic points on the characteristics of parameter changes associated with sensors for input and output parameters and connected via

A Q adder to the indicator, a multiplication-summing node associated with a power amplifier, the output of which is directly and through the additionally introduced series-connected amplitude-frequency converter and pulse divider connected to the reference resolution node connected to the indicator.

The determination of the carbon content in block 5 is made according to the formula

ifAOiic dP

Wjw .. -cVoKC

NlOKC

, ")

de P, Rllax pressure off

  gas correspondingly

at time

and maximum, mm. water column

V fV ciicc flow rate blow respectively at time TK. and at the moment

pressure maximum, nm / mic; T ,,, is the temperature of waste

gases, respectively, at the time of the RC.

and maximum; WITH; Nvwicc the distance of the tuyere nozzle from the level of the calm metal, respectively, at time T and in cm-m &

maximum pressure, m P - input and output. melting parameters; - regression coefficients.

The operation of carbon control unit 5 is as follows.

Information on the inlet and outlet parameters of the converter melting (for example, flow rate and pressure blown. The position of the tuyere, temperature and pressure of flue gases after their discharge, the amount of heat carried with water, cooling the tuyere and lost by the converter during the time is simply entered automatically as you go. Purges from ferrodynamic sensors embedded in devices, controllers, these parameters. The values of the masses of ore, lime, scrap, spar, cast iron are entered manually from the ferrodynamic setting devices. The value of each parameter entered into the sum The alternator is triggered, multiplied by the statistic coefficient and added to the rest of the parameters. The resulting voltage is balanced by the power amplifier and then fed to the amplitude-frequency converter. Next, the resulting number of pulses is divided by eight in the divider and accumulated at the output of the indicator in the form of the angle of rotation of the arrow, proportional to the integral over the time of the input voltage,. The arrow shows the current carbon content in the metal on the mobile dial, graded is given by the function of expression (1). The voltages from the input and output sensors (proportional to the pressure of the exhaust gases, the flow rate to blow, the temperature of the exhaust gases, the distance of the nozzles from the quiet metal) go to the nodes determining the specific points on the characteristics of the parameters, where the parameters are calculated, expressed under the function f of expression (1). The value of each parameter is multiplied by the corresponding statistical coefficient and added to the rest of the regression equation in cyNwaTOpe. The resulting voltage enters the indicator, where it is compared with a voltage proportional to the expression f2. The difference in voltage, proportional to, and 2, is applied to the mechanism of rotation of the movable dial of the indicator. Thus, the position of the arrow on the dial, block 5, and the voltage from the output converter of the block will reflect the carbon content in the –bath of the oxygen converter. The automatic switching of block 5 from simple mode to purge mode and vice versa is performed by the reference resolution node, when receiving a signal from the adder, the level of which corresponds to the start of the purge. The radiation spectrum control unit 8 is, for example, an MDR-3 monochromator, performing a consistent emission of radiation in a characteristic spectral region, connected to a FEP-1 photoelectric attachment equipped with a positional contact. If there are haras, black lines in the controlled area of the spectrum, the positional contact is triggered, and at the output of block 8, a voltage appears corresponding to a logical one, in the absence of a voltage, the voltage corresponding to a logical blowdown unit 13 is, for example, a contactor Two output contacts, one of which is connected to the engine of the tuyere drive, and the other to the actuator, control the valve in the pipeline to blow. During the purge process, the flame spectrum has a strong solid background, where the individual lines are almost indistinguishable, and the flame radiation differs little from the black body radiation, at the time of stopping the blown flame from the converter neck is pulled out, having a clear line spectrum. The nature of the spectrum varies as the purge progresses and is related to the carbon content of the converter bath, the chemical composition of the iron and the purge technology. So, for EMZ conditions (pig iron is processed, purging is carried out through four-sided form with an angle of nozzles to the vertical of 12 °, purge intensity of 450 nm / min, converter charge 150 tons) are characteristic lines in the blue part of the spectrum with wavelengths L 4520, 4550, 4800, 4700 A, which begin to disappear at a carbon content of 0.5% and disappear completely at 0.25%. Before blowing out a given amount of carbon in block 2, the required final carbon content is established depending on the steel grade. During the purge process in carbon control unit 5, the carbon content is continuously calculated: the voltage proportional to the calculated value enters the comparison unit 1, where it is compared with the voltage supplied from the unit 2 of a given amount of carbon. In case of equality of t-apres from the comparison unit 1, a pulse arrives at the purge unit 13, which performs process switching — lifts the tuyere and turns off the blowing. The process switching signal enters the delay block 4, where it is delayed for the time required to stabilize the process (and the removal of dust from the flame of the convector). The delay time depends on the converter's hedgehog, the intensity of the blow-out, the design of the urma tip. Time 3s1 support. establishes equal to 5 s, after the expiration of which the block of 8 control of the emission of the flame is turned on, which coitrols the spectrum in a characteristic (for example, for EMZ blue conditions) spectral region. In the presence of characteristic spectral lines at the output of block 8, a voltage corresponding to a logic one appears, in the absence of a voltage a voltage corresponding to a logical O. The voltage from block 2 of a given amount of carbon enters block 3 of the presence of characteristic spectral lines, which produces a voltage corresponding to the logic

if the specified carbon content corresponds to a characteristic spectral region, and corresponding to a logical O, if the specified carbon content lies outside the char- acteristic region (the latter corresponds to the carbon content in the converter bath below 0.25%). Logis of blocks 3 and 8 ino

combs

are rotated in the HE blocks 6 and 14 and fed into the AND block 10, which produces a logical one, and through OR 11 the voltage goes to the converter drive control block 12 and the converter is applied for sampling for analysis. If the output of the block 3 voltage

(specified

wooses the logical

the carbon content is below 0.25%), and at the output of the radiation emission control unit 8 is logical (the carbon content is above 0.25%), the AND 9 block opens, which gives a pulse to continue the winding in the purge unit 13, is installed in the control unit 5 carbon content is the carbon content corresponding to the lower boundary of the char acteristic region of the spectrum, i.e. 0, 25%.

After the termination of re-purging, the operations for controlling the purge are repeated. If the output of block 3 has characteristic spectral lines, the voltage corresponds to logical H (the specified carbon content is above 0.25%) after the termination of the purge, the voltage at the output of the block corresponding to a logical one and through the OR 11 block, the voltage goes to the converter drive control unit 12 and the converter tag) is applied to take a sample for analysis.

Claims (2)

1. USSR author's certificate number 287981, cl. C 21 C 5/30, 1971. 2. Bogushevsky B.C. et al. Computational device for dynamic control of oxygen-converting smelting. Sat Avtomatizig metallurgical production. Kiev, 1972