SU1134609A1 - Device for controlling quantity of oxygen assimilated by converter bath - Google Patents

Abstract

1. DEVICE FOR CONTROL OF THE SKINNESS OF DEVELOPED OXYGEN OF A CONVERTER BATH, containing a pressure sensor to blow fConnection through the alarm unit and the first functional transducer to the first input of the division unit, the first adder, the first input of which through the meter is connected to the tuyere position sensor, the second input of which is connected to the output of the tuyere, the second input of which is connected to the output of the tuyere, the second input of which is the first adder , the third input is connected via the second functional converter with the output of the first integrator, the fourth input is connected to the initial conditions input unit, the output is first The adder is connected to the second input of the division unit, the input of the first integrator is connected to the first output of the AND circuit, the first input of which is connected to the alarm unit, the second input of which is connected to the output of the memory unit, the first input of which is connected through the delayer to the second output of the AND circuit, the second input of the memory unit is connected to the sensor position of the converter drive and to the input of the second integrator, a water flow sensor for cooling the caisson connected to a flow meter, cooling water inlet temperature sensors at the caisson inlet and leaving it, characterized in that, in order to increase the control accuracy, it additionally contains a power unit, a second adder, a third functional transducer, the inputs of which are connected to the flow meter cooling the caisson and the temperature sensors oh (L water entering and leaving the caisson, and the output is connected through a power unit to the first input of the second adder connected by the second input to the output of the dividing unit, and the output to the second integrator, and the sensors perature with cooling water at the inlet of the caisson 1, and the output thereof are resistance thermometers SE is configured with nye respectively from thermistor semiconductor and metal. 2. The device of claim 1, wherein the third functional converter is configured as three resistors interconnected at one point, the second point of the first resistor is connected to the common point of the cooling water inlet temperature sensors in the caisson and its exit, the second point of the second resistor is connected to the second point of the sensor

Description

cooling water inlet temperature to the caisson, and the second point of the third resistor is connected to the output of the cooling water flow meter,

the second outlet of which is connected to the second point of the cooling water temperature sensor at the outlet of the caisson.

The invention relates to the control and management of the metallurgical industry, in particular the control of the oxygen absorbed by the converter bath,

A device is known for controlling the amount of assimilated oxygen in a converter bath containing oxygen flow meters, the position of the tuyere, the flow of exhaust gases and the content of carbon dioxide in them lj

However, this device is complex, as it contains a CO2 analyzer in the exhaust gases, which has low accuracy and reliability under operating conditions in oxygen converter shops, as a result of which the accuracy of control of the desired parameter is reduced.

The closest to the invention by its technical essence is a device for monitoring the amount of assimilated oxygen in the converter bath, which contains a pressure sensor to blow, connected through a signaling unit and a first functional converter to the first input of the dividing unit, the first adder, the first input of which is connected to the tuyere position through a meter whose second input is connected to the output of the first integrator, the third input is connected via the second, functional converter to the output of the first integrator, four This input is connected to the input unit for initial conditions, the output of the first adder is connected to the second input of the division unit, the input of the first integrator is connected to the first output of the I circuit, the first input of which is connected to the alarm unit, the second input of which is connected to the output of the memory block, the first input of which is connected via a delay unit with a second output circuit AND, the second input of the memory unit is connected to the converter actuator position sensor and to the output of the second integrator, a flow sensor for cooling the caisson connected to an flow meter Yes, the cooling water temperature sensors at the inlet and outlet of the caisson are 2J,

The known device is characterized by insufficient accuracy of monitoring the amount of oxygen absorbed by the bath, since the latter parameter is controlled only by the input parameters of the process without taking into account feedback on the actual process.

The aim of the invention is to increase the accuracy of controlling the amount of oxygen absorbed by the converter bath.

This goal is achieved by the device 1 ontrol of the amount of assimilated oxygen in the converter bath containing a pressure sensor to blow, connected via a signaling unit and the first functional converter to the first input of the dividing unit, the first adder, the first input of which through the meter is connected to the tuyere position sensor, the second the input of which is connected to the output of the first integrator, the third input is connected via the second functional converter with the output of the first interrator, the fourth input is connected to the input unit yes initial conditions, the output of the first adder is connected to the second input of the division unit, the input of the hypervisor integrator is connected to the first output of the I circuit, the first input of which is connected to the alarm unit, the second input of which is connected to the output of the memory block which first input is connected to the second And the output of the circuit, the second input of the memory unit is connected to the position sensor of the converter drive and to the input of the second integrator, a water flow sensor for cooling the caisson, connected to the flow meter, temperature sensors are cooled water inlet to the caisson and exit from it, additionally contains a unit for raising a power, a second, an adder, a third functional transducer, the inputs of which are connected to a flow meter that cools the caisson and cooling water inlet and outlet sensors and the output is connected through a power unit to the first input of the second adder, connected by a second input to the output of the dividing unit, and the output to the second integrator, and the cooling water inlet temperature sensors at the entrance to the caisson and you These are thermometers of resistance, made of a semiconductor thermistor and a metal, respectively. In addition, the third functional converter is made in the form of three resistors interconnected at one point, with the second point of the first resistor connected to the common point of the cooling water temperature sensors at the inlet and outlet of the caisson, the second point of the second resistor is connected to the second point of the sensor cooling water inlet temperature to the caisson, and the second point of the third resistor is connected to the output of the cooling water flow meter, the second output of which is connected to the second point of the coolant temperature sensor zhdayuschey water at the outlet of the caisson. The introduction of the third functional converter allows the amount of heat leaving the converter to be determined during the purge process, i.e. get feedback on the actual course of the process. This makes it possible to clarify the amount of oxygen absorbed by the bath and increase the accuracy of the device.

The implementation of cooling water temperature sensors at the inlet to and out of the caisson, respectively, of a semiconductor thermistor and metal, allows one to obtain an algebraic sum of the temperatures of the cooling water at the inlet and outlet of the caisson. At the same time, an increase in the cooling water temperature at the inlet to the caisson leads to a drop in the total resistance of the sensors, since the resistance of a semiconductor thermistor with an increase in temperature 11

with a third functional transducer 20, to which, in addition, sensors 21 and 22 of the cooling water temperature at the inlet and outlet of the caisson are connected. The output of the third functional converter 20 is connected via the exponential unit 23 to the second adder 24, to which the dividing unit 4 is also connected. The output of the second adder 24 is connected to the second integrator 16. The first adder 5 is connected to the initial conditions input unit 25.

The third functional converter 20 is made in the form of three resistors R4, R2, R3 interconnected at one point a, and the second 9a increasing the temperature drops the cooling water leaving the caisson leads to an increase in the total resistance of the sensors, since the resistance of the thermometer made of metal, with increasing temperature increases. Such a design of the cooling water temperature sensors makes it possible to eliminate the traditional adder and multiplication unit, to improve the accuracy of computational operations, and, consequently, the entire device. , FIG. 1 shows a block diagram of the proposed device; in fig. 2 is a block diagram of a third function converter. The device for controlling the amount of assimilated oxygen in the converter bath contains a pressure sensor 1, connected through a signaling unit 2, the first functional converter 3 to a division unit A. The input of the dividing unit 4 is also connected via the first adder 5, the meter 6 of the tuyere position with the sensor 7 of the tuyere position 8. The input of the first adder 5 is connected directly through the second functional converter 9 to the first integrator 10. The input of the first integrator 10 is connected through the blocks 11 AND and the memory 12 to the sensor position 13 of the converter drive 14, the signaling unit 2 is connected to the unit 11, which is connected to the memory unit 12 via a delay unit 15. The sensor 13 of the drive position of the converter 14 is connected to the second integrator 16. The sensor 17 of the flow of water cooling the caisson 18 is connected via a meter 19 of the cooling rate5. point 8 of the resistor and 1 is connected to the common point b of the sensors 21 and 22 of the cooling water temperature, the second point 2 of the resistor R2 is connected to the second point of the sensor 21 of the cooling water temperature at the inlet to the caisson, and the second point in the resistor is connected to the output k of the meter 19 cooling flow rate of the water, the second output of which is connected to the second point U of the sensor 22 of the cooling water temperature at the outlet of the caisson. The units of the device can be implemented, for example, on standard blocks of the AKESR complex: adders, division blocks, functional converters, and also a power unit on the computational operations blocks of the BVO; integrators on blocks of dynamic transformations BDP; the alarm unit is on the AAH unit; sensors, adjusters, parameter meters - on standard GSP devices; delay unit - on electronic timers. The block input of initial conditions is made on the basis of the corresponding setters and nodes of computing operations. The memory block is a microchip. Thermometers of resistance can be used as sensors for the cooling water temperature at the inlet to and exit of the caisson, for example, TC-2-5 and TCM-X1V, respectively. The amount of oxygen absorbed by the converter bath along the purge is determined by the expression - + 1. oOD, 3010-t-HvNtO, 6fO, 0262M where V is the amount of oxygen absorbed by the converter bath, m P - oxygen pressure after the regulating valve, N / m p - the position of the tuyere relative to the converter, mm; N is the heat number for the lining campaign; Q is the metal set, equal to jiyMMe of the amount of iron and scrap, Q is the heat flux to the caisson, kj is the current blowing time, min 9 The device works as follows. During the purging process, the oxygen pressure information is transferred from sensor 1 to alarm unit 2. When the operating value reaches the value (for example, for conditions of 130-ton converters with oxygen pressure equal to 75% of the nominal value), the unit output of unit 2 appears at unit voltage I. At the same time, memory 12 also arrives unit voltage. Block 11 And is triggered by turning on the first integrator 10. At the same time, the voltage from the output of block 11 goes to delay block 15 and then memory block 12 operates. At the same time, the AND block 11 is turned off and the first integrator 10 stops. The time of operation of the first integrator 10, determined by the setting of the delay unit 15, is chosen so that the change in the output voltage of the integrator during each work cycle corresponds to a change in the heat number for the lining campaign by one. From the output of the first integrator 10, the voltage goes to the second functional converter 9, the output voltage of which is proportional to the value of Jo 9470: 6To70262N The voltage from the output of block 9 goes to the first adder 5 where the voltage from the first integrator 10 simultaneously flows in proportion to N , from the initial condition input unit 25, a voltage proportional to the value (3070-14,5Q). The distance of the nozzle of the tuyere 8 to the level of the quiescent metal is measured by the sensor 7 of the tuyere position and is converted to a voltage proportional to the value H in the meter 6 of the tuyere position. The output voltage of the first adder 3, proportional to the value 9470 (3070 + H + 14.5q), 10.6 - "- 0.0262N, goes to block 4 division. The voltage from the proportional output of the signaling unit 2 is fed to the first, functional converter 3, the output voltage of which is proportional to the value of 3761 /, is fed to the input of the division unit 4. The output voltage of the block 4 division.

proportional to the value of the first term of the integrand of expression (1), goes to the second adder 24. The flow of water cooling the caisson is measured by the sensor 17 and converted to a voltage proportional to the flow of water in the water meter 19 and goes to the third functional converter 20, which also receives voltages proportional to the temperature of the cooling water exiting the caisson from sensor 21 and its output from sensor 22. Thus, from the output of the third functional converter 20 is removed A voltage proportional to the value of Q, which in the raising unit 23 is converted into a value of 1, 094 and enters the second adder 24, the output voltage of which is proportional to the integrand of expression (1), is fed to the input of the second integrator 16, the output voltage of which proportional to v.

At the end of the process (discharge of metal from the converter), the sensor 13 of the drive of the converter 14 is triggered, sending a voltage to reset the second integrator 16 and to the operation of the memory block 12. SetV

The solution is ready for the next melt.

The third functional converter 20 operates as follows: A voltage proportional to the flow rate of the water cooling the caisson coming from the water flow meter 19 is multiplied by successively connected resistance thermometers.

sensors 21 and 22 for the sum of the quantities proportional to the algebraic sum of the temperatures of the cooling water at the inlet and outlet of the caisson. But since the resistance thermometer at the entrance to the caisson is made of a semiconductor thermistor, and at the exit of it is made of metal, an increase in the temperature of the water at the inlet leads to a decrease in the amount, and an increase in the temperature of the water at the outlet increases the amount. The matching of the characteristics of the resistance thermometers is made by the fitting resistors R1 and R 2, and the output of the meter 19 with the total voltage is resistance to resistance R3.

Thus, the output signal of the second integrator 16 corresponds to the amount of oxygen absorbed by the converter bath.

A test of the layout that implements the proposed technical solution at the Yenakiyevo Metallurgical Plant showed that the use of the proposed device for controlling the amount of oxygen absorbed by the converter allows control with higher accuracy (± 0.012% CJ), which improves the quality of the steel produced and reduces its cost .

The expected economic effect from the use of the invention according to calculated data is 40 thousand rubles. in year. The economic effect is achieved by increasing the converter productivity by 1.2%, reducing the costs of refractory materials by 4%, which reduces the cost of steel by 0.07% RUR / t.

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Claims (2)

1. DEVICE FOR CONTROL OF THE NUMBER OF ASSUMED OXYGEN OF THE CONVERTER BATH, containing a blast pressure sensor connected via an alarm unit and a first functional converter to the first input of the division unit, a first adder, the first input of which is connected via a meter to the lance position sensor, the second input of which is connected to the output of the first integrator, the third input is connected through the second functional converter to the output of the first integrator, the fourth input is connected to the input unit of the initial conditions, the output of the first the ummator is connected to the second input of the division unit, the input of the first integrator is connected to the first output of circuit I, the first input of which is connected to the signaling unit, the second input of which is connected to the output of the memory unit, the first input of which is connected through the delay unit to the second output of circuit I, the second the input of the memory unit is connected to the sensor of the position of the drive of the converter and to the input of the second integrator, the sensor of the flow rate of water for cooling the box, connected to the flow meter, the temperature sensors of the cooling water at the entrance to the box and the output from it, characterized in that, in order to increase the accuracy of control, it additionally contains a power unit, a second adder, a third functional converter, the inputs of which are connected to a flow meter measuring the cooling box, and cooling water temperature sensors at the inlet and outlet from it, and the output is connected through the exponentiation block to the first input of the second adder, connected by the second input to the output of the division unit, and the output to the second integrator, and the cooling water temperature sensors The s at the inlet and outlet of the caisson are resistance thermometers made respectively of a semiconductor thermistor and metal. 2. The device according to p. Characterized in that the third functional converter is made in the form of three resistors interconnected at one point, the second point of the first resistor being connected to a common point of the cooling water temperature sensors at the inlet and outlet of the caisson , the second point of the second resistor is connected to the second point of the sensor SU -, 1134609 J of cooling water temperature at the inlet to the caisson, and the second point of the third resistor is connected to the output of the cooling water flow meter, the second output of which is connected to the second point of the cooling water temperature sensor at the outlet of the caisson.