SU753909A1 - Device for automatic correction of steel chemical composition - Google Patents

Description

This invention relates to ferrous metallurgy, in particular to steel deoxidation in a ladle. The closest to the invention to the technical essence and the achieved result is a device for automatic correction of the chemical composition of steel, which consists of consumable additive bins with weighing and metering devices, a sensor for the melt weight in the ladle, a regulator, the input of which is connected to the outputs of the weight sensors of the deoxidizer and metal and the output is with metering devices of feed bins. The principle of the device is to regulate the consumption of deoxidizers depending on the weight of the metal in the ladle. e. The total amount of deoxidizing and alloying agents for smelting is determined according to the technological instruction fi: A disadvantage of the known device is the lack of consideration of the loss of deoxidizing agents, which leads to a decrease in the quality of the metal. The aim of the invention is to stabilize the finished steel by chemical composition, improve the quality of the metal and reduce costs due to the optimum consumption of deoxidizing and alloying materials. The goal is achieved by a device containing a quantometer, a system for dosing corrective additives, blocks for setting, controlling and determining the weight of a metal, a block of data on the chemical composition of deoxidizers and alloying materials, equipped with a block of data on the weight of standard additives whose input is associated with the block of set points and the output is connected to a block for determining the number of corrective additives, a block of coefficients of the carbon elements for each steel grade, the input of which is the output of the task block, and the output is connected to the block for determining the number corrective additives, where the input signals are also the outputs of the data block on the chemical composition of deoxidizers and alloying materials, the metal weight determination unit, the task block and the quantometer, and the output is the weight of corrective additives that serves as an input to the control unit that performs the addition of corrective additives in the bucket. In addition, the device is equipped with a contour setting coefficients

the elements of a burner consisting of a logic circuit, in which the input is connected with a task block and a quantometer, and the output is a signal that the contour begins to work ,. which is the input of the storage device, the block of averaging coefficients, the secondary section of which is connected to the output of the storage device, and the output is connected to the block of tuning the coefficients of the carbon monoxide; memory device, where the input is the output of a task block, a quantum meter, a metal weight determination unit, a block for determining the actual weights of corrective additives of a standard data weight block of standard additives, and the output is an input signal of a carbon coefficients tuning unit, in which the input is also filled with coefficients . elements of the burn, a quantometer, a block of data on the chemical composition of deoxidizers and determining the predicted coefficient of the burn of the element for the next smelting for a given steel grade, which together with the value of the actual coefficient of the burn of the element at the last heat of this steel grade serves as an input of the block of the coefficients of the burn.

The drawing shows a diagram of the proposed device.

The device is equipped with a unit of standard weight data 1, the input of which is the output of unit 2 of the steel grade indicated in task unit 3, and the output of unit 1 is connected to unit 4 for determining the number of corrective additives. In addition, the output of block 2 of the steel grade is the high signal of the block 5 coefficients of the carbon loss of elements for each steel grade, the output of which is associated with block 4 for determining the number of corrective additives. For block 4, the input signals are also outputs of the block b data on the chemical composition of deoxidizers and alloying units, unit 7 for determining the weight of the metal, unit 8 for the required content of elements in the finished metal from the task unit 3, unit 9 for chemical analysis of the metal sample 10 before deactivation, transmitted from the quantometer 11. The output of the block 4 for determining the number of corrective additives is a signal about the weight of corrective additives, which serves as an input to the control unit 12, which performs the addition of corrective additives to the bucket.

The contour of adjustment of the coefficients of the burn elements consists of a logical circuit 13, block 14 coefficient. Qm a-lSmMo, r ° l-Mr V ()

.kor.

email

averaging, a memory device 15, as well as a tuner block 16, ki factors of a burnup. The memory device 15 has memory blocks 17-22, in which the input signals are: in block 17, the output of block 23 of the heat number, in which there is a metal sample 10 before deoxidation; in block 18, the output of block 2 steel grades; in block 19 - output of block 7

Q determine the weight of the metal; in block

20 - output unit 9 chemical analysis of the sample 10 metal before deoxidation; in block 21, the output of block 24 to determine the actual weight of the shipped corrective additives; at

5 block 22 - the output of block 1 data on the weight of standard additives. The input of the logic circuit 13 is the output of the melting number block 25 from the task block 3 and the output of the melt number block 26

0 samples 27 of the bottled finished metal transmitted from the quantometer 11, and the output — the signal for starting the burnout coefficient setting circuit — is the input of memory block 17 of memory 15. The output of memory block 18 serves as an input signal of block 14 of averaging coefficients and block 5 coefficients of loss of elements, and the outputs of blocks 5 and 14 are the input signals of block 16 of the coefficients of burnup, where the inputs also serve the outputs of blocks 19–22 of memory, the output of block 6 of the chemical composition data of oxidants and alloying materials and output of blocks Single 28 27 Sample chemical analysis of the finished cast metal. The output g of block 16 of the coefficients of burnup — the set of predicted coefficients of the burned-out elements for the next melt and the actual coefficients of the burned-out elements for the last melting of this steel grade — is the input of block 5 of the coefficients of the burn-in of elements.

5 Thus, block 1 contains data on the weight of standard doses of ferroalloys for each steel grade, determined on the basis of obtaining the required content of the element in the hot metal, but without taking into account the carbon monoxide.

The storage device 15 contains information on the deoxidation process of several successive heats, since chemical analysis of the finished metal is sometimes obtained after a considerable period of time after melting.

The number of corrective additives is determined in block 4 using the type of material balance equations:

ROP

de g

corrective weight

% (additives of ferroalloy according to the calculated element, t;

| El | element concentration in the corrective additive of ferroalloy,%;

st qoB

i

the weight of the standard th additive containing the calculated element, t;

std

El1

element concentration in the i-th standard additive,%;

GM metal weight, t;

El1, the specified content of the element in the finished metal,%;

m (I lo-t9l V5ar ° zC ° -QG G °

EL

- actual content

where is el

Ф element in the finished metal,%, depending

. e. (el..t-l)

where - the predicted ratio of the fade element on the next heat; same on last

El-smelting of this steel grade;

with

the actual coefficient of the carbon element fusion at the last heat; the same on the one before

Ca

Elgp-d smelting;

email the coefficient of averaging over this element, calculates the predicted coefficient of loss for the next smelting.

The device works as follows.

The signal to start the operation of the device is a signal that the metal has been drained from the steelmaking unit. At this point, the results of chemical analysis of the sample 10 of the metal before deoxidation are transmitted to block 9 from the quantum meter 11, and the number of this sample is melted to block 23. The input signal of block 9 goes to block 4, and also, together with the output signal of block 23, to blocks 17 and 20 of memory of storage device 15. In accordance with a given steel grade specified in block 2, from block 1, data on the weight of standard additives are transmitted to block 4. At the same time, the following signals are recorded in the memory blocks of the storage device 15; in block 18, the signal mark is recorded

 - element content

in the melt before the race souring,%; email - the predicted fade ratio of the element for a given steel grade.

In block 16, a determination is made of the predicted coefficient of the carbon impregnation of the element for the next smelting of this steel grade, as well as the actual coefficient of the carbon impregnation of the element at the last melting of this brand.

The determination of the actual fade ratio of the element is made on the basis of the following expression;

, (), (° Pedr ° P

steel coming from block 2; in block 19 - weight signal recording

5 metal transmitted from block 7; in block 22, the weight data of standard ferroalloy additives supplied from block 1 is stored. At the same time, in logic circuit 13

0, the number of the heat is transmitted from block 25 of block 3 of the task. Based on the value of the signal of block 2, corresponding to the steel grade to be melted, from block 5, select the required values of the predicted coefficients of carbon loss elements entering block 4. The same block receives data on the required content of elements in steel specified in block 8 of task 3 , block 6 data on the chemical composition of the used ferroalloys, block 7 data on the weight of the metal. According to the material balance equation (1) in block 4

5, the amounts of corrective additions of ferroalloys are determined. The values determined in block 4 are used in block 12 to control the additive amount of the required amount of corrective

0 additives to the ladle during the discharge of metal from the steelmaking unit. After the dispensers have completed their work, the signal of the block 24 on the actual weight of the seated corrective additives is recorded in the block 21. The memory of the storage device 15.

. The predicted coefficients of the burnout of elements for the next smelting of this steel grade are corrected by obtaining a chemical analysis of the sample 27

0 finished metal. Preliminarily, in the logic circuit 13, a check is carried out according to the correspondence of the melting number, according to which the chemical analogue of the finished metal is obtained, to the number of one

five

heats, the information about the process of deoxidation of which is stored in the memory 15,

According to the output signal of block 26, which characterizes the melting number of the sample 27 of the finished metal, to one of the memorized signals of block 25, for a row of successive melts in the logic circuit 13, a signal is generated that the burnout coefficient setting circuit begins to work, and the memory block 17 the device 15, according to the value of which the information on the deoxidation process of this particular heat is selected. The data of blocks 19-22 of memory are transmitted to block 16, and the information of block 18 of memory corresponding to the steel grade is fed to block 5 and block 14. From block 14 to block 16, the values are transmitted, and from block 5 to block 16 the data about dd and email. each of the elements. In addition, in block 16, from block 6, data on the chemical composition of ferroalloys, and from block 28 - data on chemical analysis of the finished metal. According to dependence (2), in block 16, Lel is calculated for each of the elements, and then, in accordance with relation (3), the predicted value of the burnup coefficient is determined for each of the elements for the next heat of this steel grade. The calculated values of t and. The ro-t-i are recorded in block 5 in place of the previous ones. The use of the device according to the invention will improve the quality of the metal, reduce the consumption of ferroalloys for smelting and reduce the number of rejected heats with the output beyond the chemical composition.

Claims (2)

1. A device for automatically correcting the chemical composition of steel, consisting of a quantometer, a dosing system for corrective additives, blocks for setting, controlling and determining the weight of the metal, a block of data on the chemical composition of deoxidizers and alloying, as well as a block for determining the actual weights of corrective additives, characterized in that, in order to stabilize the finished steel in terms of chemical composition, improve the quality of the metal and reduce the consumption of ferroalloys, it is equipped with a weight data block of standard additives, the input of which is associated with the task unit, and the output is connected to a unit for determining the number of corrective additives; a block of coefficients of burnout of elements for each steel grade, the input of which is the output of the task block, and the output is connected to the block for determining the number of corrective additives, whose inputs are connected to the outputs of the block of chemical data for deoxidizers and alloying, the unit for determining the weight of the metal, the task block and the quantometer and the output is connected to the input of the control unit which performs the addition of corrective additives to the ladle. 2. The device according to claim 1, characterized in that it provides a loop for adjusting the coefficients of the carbon elements, consisting of a logic circuit in which the input is connected to the task unit and a quantometer, and the output is connected to the input of the storage device; block averaging coefficients, the input of which is connected to the output of the storage device, and the output - with the block correction coefficients of the burn; memory device, where the input is the output of a task unit, a quantometer, a metal weight determination unit, a unit for determining the actual weights of corrective additives, a data block for standard additives weight, and the output is connected to the input of the carbon absorption coefficient setting unit, in which the input is also connected to the unit, coefficients of carbon monoxide elements, a quantum meter, a block of data on the chemical composition of deoxidizers. Sources of information taken into account in the examination 1. USSR author's certificate No. 336354, cl. C 21 C 7/06, 1972 (prototype).