CN111948264A - Online measurement system for content of metal Cr in molten steel - Google Patents
Online measurement system for content of metal Cr in molten steel Download PDFInfo
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- CN111948264A CN111948264A CN202010761780.7A CN202010761780A CN111948264A CN 111948264 A CN111948264 A CN 111948264A CN 202010761780 A CN202010761780 A CN 202010761780A CN 111948264 A CN111948264 A CN 111948264A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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Abstract
An on-line measuring system for the content of metal Cr in molten steel belongs to the technical field of rapid detection of liquid metal components at high temperature. The device comprises a sensor, a steel chamber, a thermocouple, a detection loop reference electrode, a thermoelectric loop, an A/D conversion circuit, a data processing system and a robot. The thermoelectric loop and the thermocouple are directly connected with the A/D conversion circuit; the A/D conversion circuit is connected with the data processing system; the steel chamber in the sensor is connected with a data processing system; two electrodes of the thermocouple and a reference electrode of the Cr detection loop are connected with an A/D conversion circuit; the sensor 1 is mounted on the robot. The method has the advantages that the sensor is combined with the advanced robot technology, and the task of detecting the content of the metal Cr in the molten steel under the severe smelting environment condition is realized; the problems of measurement principle, material performance and measurement system structure design of key components of the metal Cr content sensor in molten steel are solved. The rapid measurement of the content of the metal Cr in the molten steel is realized through a computer and an accurate mathematical model.
Description
Technical Field
The invention belongs to the technical field of rapid detection of liquid metal components at high temperature, and particularly provides an online measurement technical system for the content of metal Cr in molten steel, which is suitable for rapidly detecting the content of metal Cr in the molten steel in the production process of stainless steel smelting or special alloy smelting.
Background
The metal Cr is the main element determining the performance of the stainless steel, and the corrosion resistance of the steel is enhanced after the Cr element is added into the steel. The metal Cr increases the electrode potential of the iron-based solid solution in the steel, and absorbs the electrons of the iron to passivate the iron, thereby improving the corrosion resistance of the steel. The content of metallic Cr directly influences the performance of stainless steel and the quality of stainless steel final products. At present, no good method is available for rapidly detecting and analyzing the content of metallic Cr in molten steel on line in the smelting production process of stainless steel. How to realize the key technology of on-line measurement is one of the important tasks of the requirements of the stainless steel smelting process technology and the quality guarantee of the stainless steel.
Disclosure of Invention
The invention aims to provide an on-line measurement technical system for the content of metal Cr in molten steel, which is used for rapidly detecting the content of metal Cr in the molten steel in the smelting production process of stainless steel. The measuring principle and the structural design of the sensor as a key component are solved. The detection of the content of metal Cr in the molten steel in a severe environment is realized through an industrial robot, and a detection result is rapidly reported through computer data processing and is used for guiding the production of stainless steel.
The invention comprises a sensor 1, a steel chamber 2, a thermocouple 3, a detection loop reference electrode 4, a thermoelectric loop 5, an A/D conversion circuit 6, a data processing system 7 and a robot 8;
the thermoelectric loop 5 and the thermocouple 3 are directly connected with an A/D conversion circuit 6; the A/D conversion circuit 6 is connected with the data processing system 7;
the steel chamber 2 in the sensor 1 is connected with a data processing system 7; two electrodes of the thermocouple 3 and the Cr detection loop reference electrode 4 are connected with an A/D conversion circuit 6; the sensor 1 is mounted on the robot 8.
The robot system is that the sensor 1 is mounted on the robot 8. The robot is responsible for moving the sensor and detecting the position and finishing the on-line measurement task of the metal Cr content in the molten steel under the severe condition. When the sensor 1 is inserted into liquid molten steel by the robot 8, a detection circuit of the sensor is connected, and at the moment, Cr thermoelectric force detected in a thermoelectric circuit 9 in the sensor and temperature thermoelectric force of the thermocouple 3 start to work, so that the online measurement of the content of metal Cr in the liquid molten steel is realized.
In the detection process, the Cr thermoelectric potential detected in the sensor 1 and the temperature thermoelectric potential of the thermocouple 3 are output to a data processing system.
The thermoelectric loop (9) consists of a measured steel sample and a reference electrode.
The invention is further described in the following three parts of sensor, measuring industrial robot system and computer data processing system
1. Sensor with a sensor element
The sensor 1 consists of a steel sample chamber 2, a thermocouple 3 and a detection loop reference electrode 4. The steel chamber 2, the thermocouple 3 detection loop reference electrode 4, the A/D conversion circuit 6 and the data processing system 7 in the sensor 1 are connected.
The circuit system consists of a thermoelectric loop 5, a thermocouple 3, an A/D conversion circuit 6 and a data processing system 7; the thermoelectric loop 5 and the thermocouple 3 are directly connected with an A/D conversion circuit 6; the a/D conversion circuit 6 is connected to the data processing system 7.
2. The robot system is that the sensor 1 is mounted on the robot 8. The robot is responsible for moving the sensor and detecting the position and finishing the on-line measurement task of the metal Cr content in the molten steel under the severe condition. When the sensor 1 is inserted into the liquid molten steel by the robot 8, a detection circuit of the sensor is connected, and at the moment, Cr thermoelectric force detected in a thermoelectric circuit 9 in the sensor and temperature thermoelectric force of the thermocouple 3 start to work, so that the online measurement of the content of metal Cr in the liquid molten steel is realized.
In the detection process, the Cr thermoelectric potential detected in the sensor 1 and the temperature thermoelectric potential of the thermocouple 3 are output to a data processing system.
3. Data processing system
The circuit system is connected with a steel chamber 2, a thermocouple 3 detection loop reference electrode 4, a thermocouple two-electrode and a Cr detection loop reference electrode in a sensor 1 and is connected with an A/D conversion circuit 6 as shown in figure 1; the a/D conversion circuit 6 is connected to the data processing system 7.
When the robot 8 inserts the sensor 1 into the molten steel, a detection circuit is connected, and at the moment, Cr thermoelectric force detected in the sensor 1 in the sensor and the thermocouple 3 start to work, so that the detection of the content and the temperature of metal Cr in the molten steel is realized.
The invention has the advantages that the sensor is combined with the advanced robot technology to realize the task of detecting the content of metal Cr in the molten steel under the condition of severe smelting environment; the problems of measurement principle, material performance and measurement system structure design of key components of the metal Cr content sensor in molten steel are solved. The rapid measurement of the content of the metal Cr in the molten steel is realized through a computer and an accurate mathematical model.
Drawings
FIG. 1 is a schematic diagram of the operation of the sensor and circuitry of the present invention. The device comprises a sensor 1, a steel chamber 2, a thermocouple 3, a detection circuit reference electrode 4, a thermoelectric circuit 5, an A/D conversion circuit 6 and a data processing system 7.
Fig. 2 is a diagram showing an internal structural design of a sensor in the sensor. Wherein, the steel chamber 2, the thermocouple 3 and the detection loop reference electrode 4.
Fig. 3 is a schematic view of the connection of an industrial robot. Robot 8
Fig. 4 is a schematic diagram of the operation of the sensor.
Detailed Description
The application patent is composed of a sensor, a measuring industrial robot and a computer data processing system.
The sensor 1 is designed to detect the loop reference electrode 4 from the steel chamber 2 and thermocouple 3 in the thermoelectric loop.
Wherein the material protecting the sensor 1 is made of a high temperature resistant material. The structure of the pyroelectric loop 9, thermocouple 3 and detection loop reference electrode 4 in the sensor is shown in fig. 2.
The assembled sensor is fixed to the robot 8 and the measurement circuit is connected. The sensors, robot hand and data processing system connections are shown in figure 4.
The robot moves the sensor to the detection position quickly according to the instruction and inserts the sensor into the liquid steel.
When the detection is started, a steel chamber of the sensor 1 obtains a steel sample under the action of hydrostatic pressure of molten steel, detected Cr thermoelectric force in the thermoelectric loop 9 and temperature thermoelectric force signals of the thermocouple 3 are respectively output to the A/D conversion circuit 6 according to circuits and transmitted to the computer data processing system 7, the computer data processing system 7 processes detected data and operates according to a mathematical model, and a measurement curve and a calculated value of metal Cr components in the molten steel are output.
The key technology of the application patent is to solve the online rapid detection of the metal Cr content and the temperature in molten steel. In particular to the establishment of a mathematical model of the content of metal Cr in molten steel in a laboratory.
Example (c): the content of metal Cr in the molten steel is measured on line in the smelting process of the electric furnace stainless steel.
1Gr18Ni9Tai stainless steel
The main chemical components of the steel of the variety smelted by the electric arc furnace are as follows:
C≤0.15％
Ni＝8.0—10.0％
Cr＝17.0—19.0％
Mn≤2.0％
Si≤1.0％
S≤0.15％
P≤0.20％
during the smelting process, Cr in molten steel is controlled, and the yield of Cr in steel is directly influenced. The designed sensor can be operated on line and directly inserted to detect the content of Cr in molten steel, and the operation is completed within 1 minute. The detected data are directly and quickly fed back to an operator, and the process and the addition amount of Cr and Fe can be adjusted in time. Controlling the Cr content in the molten steel to be 17.0-19.0%
The smelting time is shortened. In contrast, laboratory analysis is not. The robot combined with modern development works under completely harsh conditions. And process management is implemented.
Working principle of system
The sensor for measuring the content of metal Cr in molten steel designed according to the thermoelectric principle is a special thermocouple for measuring the content of metal Cr in molten steel, and consists of a steel sample of an electrode to be measured and a reference electrode. The thermoelectric potential generated by the thermocouple formed by the metal Cr in the measured steel sample and the reference electrode is considered as the characteristics of two conductors forming the thermoelectric loop, the numerical value of the thermoelectric potential is determined by the chemical compositions of the measured electrode steel sample and the reference electrode, and if the reference electrode is fixed, the thermoelectric characteristic only determines the chemical composition of the measured electrode steel sample of the other conductor. If the other components are not changed in a certain range except the chemical components of Cr in the steel sample of the electrode to be tested, the change of the thermoelectromotive force is only related to the change of the chemical components of Cr (an experiment is carried out in a laboratory to establish a mathematical model).
The mathematical expression of the physical basis of the principle of rapidly measuring Cr in molten steel by using a thermoelectric method is as follows:
contact potential
Thermoelectric potential
Total thermoelectric potential
Wherein K is Boehringer's constant, 1.36x 10-16;
e-amount of electron charge, 1.602X 10-19C;
t-absolute temperature of hot end of contact point, K;
t0-contact point cold end absolute temperature, K;
NA-free electron density of Metal A;
NB-free electron density of metal B.
FIG. 4 is a schematic diagram of the operation of the sensor
In stainless steel smelting, according to different varieties, on the premise that chemical components are not changed in a certain range, a molten steel sample is used as a measured electrode in a thermoelectric circuit and a selected reference electrode to form a sensor. The change in measured thermoelectric force in the thermoelectric circuit in the sensor is indicative of the change in the Cr content of the molten steel. A mathematical model was established from laboratory tests based on the above principles.
Under a certain temperature difference, [ Cr%]＝f(E(TCr)∣ΔT)
[ Cr% ]: the content of Cr in molten steel;
E(TCr): the steel water sample is used as the thermoelectromotive force generated by the measured electrode and the reference electrode;
Δ T: which represents a temperature difference formed between the temperature of molten steel and a reference temperature.
3. Measuring process
The mounted sensor is fixed on the robot (8) and is communicated with the measuring circuit;
the robot moves the sensor to a specified measuring position according to an instruction, and the robot is ready for work;
the robot starts to measure, and the robot hand inserts the sensor into the liquid molten steel rapidly according to the instruction.
And when the detection is started, the sensor obtains a steel water sample, obtains the detected Cr thermoelectric potential and temperature thermoelectric potential signals, successfully measures, and the robot quickly pulls out the measuring gun, finishes the measuring task and shifts to the initial position.
The obtained measuring electric signal is sent to an A/D conversion circuit to be transmitted to a computer data processing system, and is operated according to a mathematical model through a computer data processing system, and a measuring curve and a calculated value of the metal Cr component in the molten steel are output.
Claims (2)
1. An online measurement system for the content of Cr in molten steel is characterized by comprising a sensor (1), a steel chamber (2), a thermocouple (3), a detection loop reference electrode (4), a thermoelectric loop (5), an A/D conversion circuit (6), a data processing system (7) and a robot (8);
the thermoelectric circuit (5) and the thermocouple (3) are directly connected with the A/D conversion circuit (6); the A/D conversion circuit (6) is connected with the data processing system (7);
the steel chamber (2) in the sensor (1) is connected with a data processing system (7); two electrodes of the thermocouple (3) and the Cr detection loop reference electrode (4) are connected with an A/D conversion circuit (6); the sensor (1) is arranged on the robot (8);
the robot system is characterized in that a sensor (1) is arranged on a robot (8); the robot is responsible for moving the sensor to detect the position and completing the task of online measuring the content of metal Cr in the molten steel under severe conditions; when the sensor (1) is inserted into the liquid molten steel by the robot (8), a detection circuit of the sensor is connected, and at the moment, Cr thermoelectric potential detected in a thermoelectric circuit (9) in the sensor and temperature thermoelectric potential of a thermocouple (3) start to work, so that the online measurement of the content of metal Cr in the liquid molten steel is realized;
in the detection process, Cr thermoelectric force detected in the sensor (1) and temperature thermoelectric force of the thermocouple (3) are output to a data processing system.
2. The system for the on-line measurement of the metal Cr content in molten steel according to claim 1, wherein the thermoelectric circuit (9) consists of a sample of molten steel to be measured and a reference electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761780.7A CN111948264A (en) | 2020-07-31 | 2020-07-31 | Online measurement system for content of metal Cr in molten steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761780.7A CN111948264A (en) | 2020-07-31 | 2020-07-31 | Online measurement system for content of metal Cr in molten steel |
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| CN111948264A true CN111948264A (en) | 2020-11-17 |
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| CN202010761780.7A Pending CN111948264A (en) | 2020-07-31 | 2020-07-31 | Online measurement system for content of metal Cr in molten steel |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005308579A (en) * | 2004-04-22 | 2005-11-04 | Daido Steel Co Ltd | Method and apparatus for estimating concentration of si in molten steel in production of stainless steel |
| CN105628769A (en) * | 2015-12-24 | 2016-06-01 | 冶金自动化研究设计院 | Reciprocating-type regeneration-method continuous oxygen measurement sensor |
| CN107962579A (en) * | 2017-11-20 | 2018-04-27 | 西安交通大学 | A kind of robot delicate and material detection identifying system |
| CN111175366A (en) * | 2019-12-27 | 2020-05-19 | 冶金自动化研究设计院 | Oxygen partial pressure robot measurement system in float glass liquid metal tin |
-
2020
- 2020-07-31 CN CN202010761780.7A patent/CN111948264A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005308579A (en) * | 2004-04-22 | 2005-11-04 | Daido Steel Co Ltd | Method and apparatus for estimating concentration of si in molten steel in production of stainless steel |
| CN105628769A (en) * | 2015-12-24 | 2016-06-01 | 冶金自动化研究设计院 | Reciprocating-type regeneration-method continuous oxygen measurement sensor |
| CN107962579A (en) * | 2017-11-20 | 2018-04-27 | 西安交通大学 | A kind of robot delicate and material detection identifying system |
| CN111175366A (en) * | 2019-12-27 | 2020-05-19 | 冶金自动化研究设计院 | Oxygen partial pressure robot measurement system in float glass liquid metal tin |
Non-Patent Citations (1)
| Title |
|---|
| 杨赤 等: "冶金传感器的实验室研究方法", 《工业计量》 * |
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Application publication date: 20201117 |
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