SU1245840A1 - Device for controlling electric operating conditions of three-phase six-electrode ore-smelting furnace with conducting hearth - Google Patents

Description

The invention relates to electrothermal and more specifically to automatic regulation of the electric mode of six-electrode ore-thermal furnaces in the smelting of ferroalloys, and can be used in the smelting of phosphorus, calcium carbide, ferronickel and other alloys.

The purpose of the invention is to increase the productivity of the furnace and reduce the specific energy consumption by increasing the accuracy of electric mode control.

The drawing shows a block diagram of the proposed device.

In the block diagram, the output of current sensor 1 is the nearest (p) with respect to the regulated e. The first phase product is connected to the first input of a multiplier 2, the second input of which is connected to the output of the input element 3 of the factor k / a, the inductive effect of the nearest phase on the voltage of the adjustable electrode. The output of element 2 is connected with the first input of element 4 of the shift angle change, the second input of which is connected to the input element 5 of the magnitude V / change of the angle of the current phase signal of the nearest phase. The output of element 4 is connected to the first input of the element 6 of algebraic addition, the third input of which is connected with the output of sensor 7 of the voltage of the adjustable electrode. The output of the distant current sensor 8 (t) with respect to the adjustable phase electrode is connected to the first input of the second multiplication element 9, the second input of which is connected to the input element 10 of the coefficient k / b, the inductive effect of the far phase on the voltage of the adjustable electrode. The output of element 9 is connected to the first input of the second element 11 of the change in the angle of shift, the second input of which is connected to the output of the element 12 for input of the value Y, the change in the angle of the current signal of the far phase. The output of the element 11 is connected to the second input of the element 6 of algebraic addition, the output of which is the output of the voltage calculating unit of the adjustable electrode electrode. The output of element 6 is connected to the first input of the impedance deviation calculating unit 13, the second input of which is connected to the sensor 14 of the current of the adjustable electrode, and the third input is connected to the task unit 15. The output of the unit 13 through the amplifier 16 is connected with the actuator 17 for moving the adjustable electrode.

The device works as follows.

The signal 5 "from the sensor 1 of the electrode current of the nearest phase is fed to the input of the multiplication element 2, the second input of which receives the signal k / a, from the output of the input element 3 of the inductive influence coefficient of the nearest phase. Output signal

element 2 is fed to the first input of the element 4 changes the angle of shift, the second input of which receives the signal if, from the element 5 input value changes the angle of shift

ha At the output of element 4, a voltage error signal is generated for the regulating electrode of the electrode due to the inductive effect of the current of the nearest phase. Similarly, at the output of element 1 I, a voltage error signal of the adjustable electrode is formed due to the influence of the far-phase current. The output signals of elements 4 and 11 are fed to the element 6 of algebraic addition, where they are subtracted from the voltage U, o, coming from the voltage sensor 7. At the output of element 6, a signal is generated (Y, the actual voltage of the adjustable electrode relative to the bottom, according to the expression

and, (, „- (

- but.

+ f ((

0

5 5

0

0

Where

7, and 7sh -

voltage vector of the adjustable electrode relative to the poddiny. AT;

L io - vector of the measured voltage of the adjustable electrode relative to the bottom, V; module of the current value of the current of the electrodes of the nearest (p) and far (t) with respect to the adjustable electrode of the phases, k A :,

, Ush - initial shear angles "; Tm, glad .;

the distance between the axes of the controlled and the closest to it electrode phases of the pit, respectively, m;

- constants of inductive interaction between phases, determined by alternate single-phase switching on of furnace transformers;

coefficient of inductive interaction, voltage error value at a current of another phase, equal to 1 kA, at distance BM

but/; B: -

k; one;

k scientific research institute

kA

voltage shift angle of error from the current of the nearest phase, rad .; In / -the same, in the far phase.

The values of the indices and the members of formula (1) are given in the table.

The inductive coupling constants between phases for rectangular six-electrode ore-thermal furnaces with a power of 63 MVA, which produce manganese alloys, are equal to

Vt

E (0.85 - 0.95) kA, 35) pleased.

The signal from block 6 is fed to the first input of block 13, calculating the impedance deviation, the second input of which receives the signal 7i from the sensor 14 of the current of the adjustable electrode. At the output of block 13, a signal Z cli is formed - dUi, with the values of C l d coming from the output of block 15 of the task. When the deviation of the electric mode from the set point, the signal Z f O comes to the amplifier 16 and then to the actuator 17 for moving the electrode, which is used to work out the error.

The functions of elements 2 and 3 and 9 and 10 can be implemented on the measurement note. 1-6 - the number of the electrode; I-III - phase number.

formatter with coefficient, and k / b, respectively. Similarly, as elements 4,5 and 11, 12, resistive-capacitive and inductively resistive chains with shear angles Y / and Y can be used; respectively. The device can also be implemented on microprocessor technology, for example, KTS LIUS-2.

The invention provides precise regulation of the electric mode of the furnace according to the gap impedance of the electrode - hearth, and thus allows improving the technical and economic performance of the unit.

Claims (1)

A DEVICE FOR REGULATING THE ELECTRICAL MODE OF THE THREE-PHASE SIX-ELECTRODE ORE-THERMAL FURNACE WITH A CONDUCTING BURD, containing in the control circuit of each electrode the current sensors of the electrode and the voltage of the electrode relative to the bottom, the amplifier is connected to the electrode moving drive, the target unit for increasing the electrode movement, which furnace performance and reduce specific energy consumption by improving the accuracy of regulation of the electric mode, it is equipped with current sensors the nearest and distant genera of phases with respect to the adjustable electrode, two multiplication elements, input elements of the coefficient of inductive effect of the nearest and far phases on the voltage of the adjustable electrode, two elements of the shift angle change, two elements of the input of the magnitude of the change in the shear angle, the addition element, the calculation unit impedance deviations, wherein the electrode current sensor is connected to the first input of the impedance deviation calculation unit, the second input of which is connected to the reference unit, in addition, the output of the current sensor the electrodes of the phase closest to the regulated electrode is connected to the first input of the multiplication element, the second input of which is connected to the output of the input element of the coefficient of inductive influence of the nearest phase on the voltage of the adjustable electrode, the output of the multiplication element is connected to the first input of the element for changing the angle of shift, the second input of which is connected to the output of the input element of the magnitude of the change in the angle of shift of the current signal of the nearest phase, the output of the element of the change of the angle of shift is connected to the first input of the algebraic element addition, in addition, the output of the current sensor of the electrodes of the far phase relative to the adjustable electrode is connected to the first input of the second multiplication element, the second input of which is connected to the input element of the coefficient of inductive influence of the far phase on the voltage of the adjustable electrode, the output of the second multiplication element is connected to the first input of the second an element for changing the angle of shift, the second input of which is connected to an element for inputting the magnitude of the change in the angle of shift of the far phase current signal, the output of the second element for changing the angle of shift hectare is connected to the second input of the algebraic addition element, to the third input of which an adjustable electrode voltage sensor is connected, and the output of the algebraic addition element is connected to the third input of the impedance deviation calculation unit.