SU779398A1 - Device for decarburization rate control in bath of metallurgical set - Google Patents

Description

(54) DEVICE OF CONTROL OF RATE OF DECOMPOSITION IN THE BATHTUB OF METALLURGICAL UNIT

;. . , one

The invention of computer technology, in particular, devices for controlling a converter process, can be applied in mar. Tenov workshops.

A device for controlling the decarburization rate in the converter bath is known, which contains units for measuring the flow of exhaust gases and blowing, respectively, connected to the extraction unit and the sensor, the computing unit and the initial conditions input unit M. ; . However, the known device has low accuracy due to the large error and delay in the measurement of the flow rate of waste gases, as well as the effect on the control results of the additives introduced into the converter at the end of the purge.

A device is known that the second co-g holds blocks for measuring the electrical resistance between the oxygen lance and the bath Pz.

However, the prior art device has a low accuracy, since during the purging process the bath foams up after this point, the control of the decarburization becomes impossible.

The closest to the invention in its technical essence and the achieved result is a device comprising an electrical discharge measurement unit of the exhaust gas connected to the electrodes and the unit, inputting initial conditions, and the indicating unit CG.

The disadvantage of the device is low control accuracy, since the magnitude of the electrical conductivity is ambiguously related to the decarburization rate.

The purpose of the invention is to improve the accuracy of control.

15

 The goal is achieved by the fact that the device contains an electrical conductivity measuring unit for exhaust gas connected to electrodes and an initial conditions input unit, an indicating unit, a current measuring unit, whose input is connected to electrodes and through an amplifier with initial conditions input and measuring electrical conductivity of the outgoing gas and block

Claims (3)

25 measure the intensity of the magnetic field, the input of which is connected to the electromagnet and through an amplifier with a unit of initial conditions, and output 30 through an amplifier with an indication unit. to which, in addition, the output of the current measuring unit is connected. The introduction of new blocks and the connections between them allows a magnetic field to be created in the gas flow perpendicular to its direction, which induces a current in the flow. The magnitude of the latter is unambiguously determined by the decarburization rate of the bath, the magnitude of the magnetic field and the conductivity of the gas stream. Measuring and accounting for these quantities allows the decarburization rate to be controlled according to the goal. The drawing shows a block diagram of the device. The device comprises an initial condition input unit 1, an electrical conductivity measurement unit 2 of the exhaust gas, amplifiers 3.4, an indication unit 5, a magnetic field intensity measurement unit b, a current intensity measurement unit 7, an amplifier 8, electrodes 9.10, an electromagnet 11 , gas duct 12, converter 13. The output of initial conditions block 1 is connected through amplifiers 3 and 4, respectively, to the input of blocks 6,7 of magnetic field strength measurement, the power of the current flowing into the gas and directly with the electrical conductivity measuring unit 2 g . . . The input of the voltage measuring block. Magnetic field magnetic field is also connected to the electromagnet 11, the input of the current measurement unit 7 flowing in the gas is connected to the electrodes 10, and the input of the electrical conductivity measurement unit 2 of the exhaust gas with electrodes 9. Electrodes made of steel, water-cooled and present a single design with an electromagnet. The output of the electrical conductivity measurement unit 2 of the waste gas is connected through an amplifier 4 to the input of the current measuring unit 7. The output of the magnetic field intensity measuring unit b is connected via an amplifier 8 to the input of the indicating unit 5, which is also connected to the output of the current measuring unit 7. When an ionized gas moves in a magnetic field, an electromotive motion arises and a current flows. j V (Vr-B-E) A / m where — current density flowing in a gas, A / m — is the specific electrical conductivity of the gas, S / m, VP is the gas velocity, m / s, is the magnetic field strength . T, is the strength of the external electric field, due to the load, determined by the design of the electrodes and the load resistance, in / m. For electrodes in the form of flat plates with J Dn 5e, where Вц is the load resistance / Ohm, $ 3 is the electrode area, m, d is the distance between the electrodes, m. Considering that the decarburization rate is related to converters without overburning with speed gases by the ratio of W.- S 0.0536 g to% / min, (3) Vc and ° .J the speed of the decarboniferous Vp van,% / min, cross-sectional area of the flue, m, metal mass, t, purge duration, min, CHL ) - coefficient of intoxication IU. tal determined by the technological features of the process. For the conditions of blowing a 130-ton converter through a 4-nozzle shape with a nozzle inclination angle to the vertical 20/1 - Here Here is 0.722 min. Dependence (3) also holds for converters with afterburning of exhaust gases when measured in the flare core. Solving together equations (1), (2) and (3) we get c. 0.0536-- Vyd S JS, / (4; Before purging, information about the initial conditions is set in block 1: information on the mass of the metal (cast iron mass + stash weight) is set by turning the frame of the prFraser PF1, the coefficient of metal fatigue on the alternating the resistor Pi, the load resistance of the external circuit on the PF2 converter, the parameters of the electrodes on the resistor P2. Thus, the voltage from the output of the resistor P1 is proportional to the product b (t) G |, and from the output of the resistor P2 is proportional to the resistor cross section Rz. In the process of flushing, a voltage proportional to the electrical conductivity of the exhaust gas is supplied from the electrodes 9 installed in the duct 12 to the electrical conductivity measurement unit 2 of the exhaust gas, for example, the H-343 current meter with a built-in profiled cam and a ferrodynamic transformer PPZ. the magnetic field proportional to the magnitudes comes from the power supply circuit of the electromagnet 11 to the magnetic field strength measuring unit b, for example, a voltmeter with an integrated ferrodynamic transducer PF4, the current induced in the gas comes from the electrodes 10 on, block 7 for example, a current meter .. H-343. In. The moment of the start of the purge, determined by the distance of the lance nozzle to the level of the calm bath and the oxygen consumption, the contact K and the motor D is activated, which changes the voltage removed from the resistor P, realizes the dependence b (t). The output voltage from block 1 is amplified by amplifier 3 and multiplied by the output voltage of block 6, taken from the PF4 converter. Thus, the voltage from the block b is proportional to the value of BG, b (), which is amplified by the amplifier 8i. enters block 5 of instructions. The output Hoei voltage of block 2, proportional to the value obtained by & k with the help of the profiled cam K ;, is summed with the voltage taken from the resistor R. 2. Thus, the input proportional to 1 R (-s : - + t S.), which multiplies .0 (1, d e c with a voltage proportional to the force of the current induced in the gas, on the PF5 ferrodynamic converter. From the output of the RZ resistor, the voltage proportional to the values of + 7- S- ) j S coming in b. indicating unit 5. In indicating 5, the output signal of block 7 is divided by the signal of block b, i.e. the position of the arrow of the indication block 5 is proportional to the right side of the expression (4). Claims A device for monitoring the decarburization rate in a bath of a metallurgical unit, comprising an electrical conductivity measuring unit for exhaust gas, connected to the electrodes and an initial condition-VIY input unit, and an indicating unit, characterized in that it additionally contains a measuring unit the intensity of the magnetic field, the electromagnet and the unit for measuring the current, the input of which is connected to the electrodes and, through an amplifier, with initial conditions input and conductivity measurement blocks gas and the measurement unit (magnetic field intensity, the input of which is connected to the electromagnet and through the amplifier to the initial conditions input unit, and the output through the amplifier to the indicating unit, to which, in addition, the output of the current measuring unit is connected. Sources information taken into account in the examination 1. The author's certificate of the USSR I 283259, cl. C 21 C 5/30,. 2. The patent of FRG 1433460, cl. C 21 C 5/30, 1970. 3.Sheretostov B.I. and others. The study of the electrical conductivity of the flame of the oxygen converter. Collection Metallurgists and Coke chemistry. K., Tech1971, vol. 25, p. 89-91. S No. "Sa S" # 4K4i -.----; /:   779398