CN115494010A - Molten steel component and temperature continuous detection system and method - Google Patents
Molten steel component and temperature continuous detection system and method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 136
- 239000010959 steel Substances 0.000 title claims abstract description 136
- 238000001514 detection method Methods 0.000 title claims abstract description 81
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- 238000013461 design Methods 0.000 abstract description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0044—Furnaces, ovens, kilns
Abstract
The invention relates to a molten steel composition and temperature continuous detection system and method, the system includes detecting probe and analytical unit set in converter body A, there are light source probes in the detecting probe, used for obtaining the information of molten steel light source E; decomposing the atomic characteristic spectrum composite light contained in the information of the molten steel light source E into an atomic composite spectrum G by an analysis unit, and analyzing and calculating the atomic composite spectrum G and an element database in a computer; the analysis unit restores the information of the molten steel light source E into a temperature spectrum M, and compares and analyzes the temperature spectrum M with temperature data in a temperature database in the computer. The invention realizes the continuous, real-time and accurate online detection, display and control of the temperature/key chemical element components and contents of the molten steel. The invention has compact design and quick and convenient assembly, and is not only suitable for large and small converters with different tonnages, but also suitable for various metallurgical furnaces, metal mixer furnaces, continuous caster tundish and the like with different tonnages in principle.
Description
The application is a divisional application of Chinese patent application with the application date of 2017, 3 months and 3 days, the application number of 2017101238468, and the invention name of the system and the method for continuously detecting the components and the temperature of the molten steel.
Technical Field
The invention belongs to the technical field of smelting production detection equipment, and relates to a system and a method for continuously detecting components and temperature of molten steel.
Background
In the modern steelmaking process, molten steel smelting end point control is required, namely control is carried out by enabling the chemical composition and the temperature of metal to simultaneously meet the steel tapping requirement of a planned steel grade at the steelmaking blowing end point (oxygen blowing end) of a top-bottom combined blown converter. In order to meet the requirement of controlling the smelting end point of the molten steel, the temperature of the molten steel, the components and the content of chemical elements must be measured, so that the accurate online detection and control of the temperature of the molten steel and the components and the content of key chemical elements at the steelmaking end point of the converter are realized. At present, in order to shorten the steel-making period and improve the productivity, in the smelting operation and production of the converter, a sublance device and a probe are generally adopted for fast analysis (only suitable for large converters with the tonnage of more than 150 t) and a converter flue gas analysis method for measuring the temperature, the chemical element components and the content of molten steel.
The sublance is a metal lance which is arranged in the oxygen top-blown converter, except for an oxygen lance for supplying oxygen, can be lifted and is directly inserted into the molten bath similarly to the oxygen lance. The end of the sublance can be inserted with various probes with different functions for measuring the information such as the temperature and the components in the furnace in the smelting process, and the obtained information is analyzed and processed by a computer and then is transmitted to a converter main control room. Due to different arrangement of sublance equipment, a composite series of actions such as transverse movement or rotation, high-speed lifting, probe loading and unloading, probe bin loading and the like are required, mechanical equipment and electrical control are complex, the failure rate is high, and the investment is expensive. In a high-temperature working environment, the sublance is a slender water cooling part which is easy to deform and bend, so that a plurality of difficulties are brought to automatic and accurate insertion of a probe, accurate positioning and reliability of each action of the sublance, equipment maintenance, repair and the like. In addition, the measurement of the converter molten steel by the sublance is discontinuous and discontinuous, so that the hit rate of the converter for dynamically controlling the carbon and the temperature and meeting the tapping requirement is greatly reduced. In addition, according to different detection purposes, in the steel-making production process, the sublance needs to be inserted with and consume a large number of expensive detection probes with different functions, and measurement, probe sampling analysis and data transmission are carried out according to the running period of the sublance, so that the production cost is increased, the corresponding operator posts of the sublance need to be set, the steel-making smelting period is prolonged, and the production rate is reduced. For many years, steel mills in all countries in the world seek a method which is applicable to large and small converters with different tonnages and various metallurgical furnaces, is simple, convenient and reliable, has low equipment and detection cost, and can dynamically display the temperature of molten steel, chemical element components and contents, thereby realizing continuous, real-time, accurate probe-free online detection and control of the temperature of molten steel at the steelmaking end point of the converter and the key chemical element components and contents.
This was attempted using the VAI-CON Chem measurement system of the Austrian Utility, which uses laser-induced plasma spectral lines of molten steel and infrared radiation to continuously measure the chemical composition and temperature of the molten steel in the bath. Besides a measuring computer and optical fibers, the detection system also adopts a laser system, a lens and reflector system, an ultraviolet and infrared spectrometer, a camera and the like, so that the detection system is complex and expensive in equipment, a precise measurement optical element is difficult to adapt to various severe environments such as high temperature, smoke, metal dust, vibration, strong magnetism and the like in a steelmaking workshop, the field is poor in interference resistance, and the measurement equipment is installed on a metallurgical furnace shell, so that the working environment is severe and the service life of the measurement equipment is influenced. In addition, in order to utilize the blowing tuyere of the original equipment of the AOD converter, a molten steel emission light source detection channel is horizontally arranged, if the detection channel is inert gas (Ar/N) 2 ) The overflow accident of molten steel along the horizontal light source detection channel can happen due to the stop of blowing in the accident, and the defects can be the main reason that the VAI-CON Chem molten steel component continuous measurement system is not widely applied to steel mills in various countries.
Another type of online detection system without probe for molten steel components is a converter flue gas analysis system, which consists of a flue gas sampling and gas processing system, a mass spectrometer, a calibration device, a control and communication device and the like. The flue gas components in converter blowing are continuously detected and analyzed by adopting a mass spectrometer, the flue gas analysis data is used as the basis of a dynamic control model, and the analysis result is used for determining the converter blowing end point, calculating the decarburization rate, predicting molten steel and slag components, predicting the temperature of a molten pool and the like. The specific detection method is to use a mass spectrometer to measure the content of the smoke (such as N) 2 ) Is/are as followsThe content is used for predicting the content of residual carbon in the molten steel and the content of phosphorus and manganese at the end point, and can also be used for predicting the temperature of the molten steel. As the furnace gas sampling water-cooling probe is arranged in the vaporization flue of the converter, the high temperature, much dust and corrosive gas exist in the flue, the working environment of the probe is very severe, and the probe is easy to block in long-term operation and directly influences the detection and analysis results. In addition, the flue gas analysis system is generally installed in an analysis cabin of a high platform above a primary dust removal flue of the converter close to the sampling head, and the cabin must ensure heat insulation and dust prevention and be provided with facilities such as air conditioning and ventilation. In consideration of the safety of maintenance personnel, CO and O are also arranged in the analysis small room 2 Automatic concentration alarm. The prediction precision of the converter flue gas analysis system is simultaneously influenced by multiple factors such as bottom blowing condition, oxygen lance height, slag chemical composition, slagging material addition system, blowing process stability, calculation and control model and the like. In addition, the temperature, chemical element components and content of the converter molten steel detected by the system are collected smoke (such as N) 2 ) The content is indirectly predicted and is not directly detected, so that the detection precision and hit rate of the end point temperature, chemical components and content of the molten steel tapped from the converter are low, and the detection equipment investment and maintenance workload are large.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for continuously detecting molten steel components and temperature. The system can be suitable for large and small converters with different types of tonnage and various metallurgical furnaces, is simple, convenient and reliable, has low equipment and detection cost, and can dynamically and accurately display the temperature of the molten steel, the chemical element components and the content, thereby realizing continuous, real-time and accurate probe-free online detection, display and control of the temperature of the molten steel at the steelmaking end point of the converter and the key chemical element components and the content.
One of the purposes of the invention is realized by the following technical scheme:
a molten steel composition and temperature continuous detection system comprises a detection probe and an analysis unit which are arranged on a converter body A;
the detection probe is communicated with the inner space of the furnace body, the position of the inlet of the detection probe is higher than the liquid level D of the molten steel, and the detection probe and the liquid level D of the molten steel are inclined by an angle theta and are inserted into the molten steel in the furnace body; a nozzle is arranged at the end part of the detection probe channel extending into the furnace, an inert gas injection inlet is arranged at the inlet of the detection probe channel, and the inert gas is Ar; a light source probe I and a light source probe II for acquiring the information of the molten steel light source E are arranged in the detection probe;
the analysis unit comprises a light source receiver, a spectrometer, an industrial camera I, an industrial camera II and a measurement computer, wherein the light source receiver, the spectrometer, the industrial camera I, the industrial camera II and the measurement computer are arranged in a main control chamber of the converter; the spectrometer is connected with an industrial camera II, and the industrial camera II is connected with a measuring computer; the light source probe I is connected with the light source receiver through an optical fiber cable I, and the light source probe II is connected with the spectrometer through an optical fiber cable II; the optical fiber cable I and the optical fiber cable II are connected or disconnected through an optical fiber cable interface arranged on the detection channel, and the optical fiber cable interface is arranged outside the steelmaking converter body at the upper end of the detection channel;
the light source probe I collects information of a molten steel light source E, the information is reduced into a spectrum through a light source receiver, and an industrial camera I is used for continuous shooting and photoelectric conversion to obtain a molten steel temperature spectrum M;
the light source probe II acquires information of a molten steel light source E, the atomic characteristic spectrum composite light is decomposed into spectral lines through a spectrometer, and an industrial camera II is used for direct shooting and photoelectric conversion to obtain an atomic composite spectrum G;
the measurement computer receives the molten steel temperature spectrum M and the atomic composite spectrum G, and analyzes, calculates and compares the molten steel temperature spectrum M and the atomic composite spectrum G with a temperature database and an element database stored in the measurement computer respectively to realize continuous, real-time and accurate online detection, display and control of the molten steel temperature and the components and contents of key chemical elements;
the implementation of the temperature database comprises: the molten steel temperature range is as follows: 1500-1750 ℃, if the precision is 0.5 ℃, 500 grades are divided, in a heating container filled with inert gas, within a certain temperature range, the sample molten steel in the container is heated by grades according to a certain grade range to set the temperature precision, simultaneously, an industrial camera is used for shooting the temperature spectrum of each grade correspondingly, and the spectrum is converted into corresponding electric signals to be stored in a measuring computer database, namely, a temperature database is obtained;
the implementation of the element database comprises: finding out the corresponding function relation between the atomic emission intensity corresponding to the atomic composite spectrum wavelength at a certain temperature of the molten steel and the contents of various chemical elements at a certain temperature of the molten steel through an element heating test; the content of each element is also graded according to intervals, graded according to the specific element content, a certain quantitative element is heated according to the graded content at a certain temperature in a heating container filled with inert gas, the graded content element is melted or gasified, the corresponding value of the quantitative element between the graded content and the corresponding atomic emission intensity of the characteristic wavelength is obtained, meanwhile, an industrial camera is used for shooting the corresponding atomic emission intensity of the quantitative element between the graded content and the characteristic wavelength, and the corresponding atomic emission intensity is converted into corresponding electric signals to be stored in a measuring computer database, so that an element database is obtained.
The second purpose of the invention is realized by the following technical scheme:
a method for continuously detecting the components and the temperature of molten steel comprises the following steps:
blowing Ar or N into the molten pool through detecting an inert gas blowing inlet on a detection channel 2 An inert gas;
acquiring a pulsed spherical cavity high-fidelity molten steel light source E primary color spectrum formed on the molten steel surface in front of the end part of the detection nozzle by using a light source probe;
the information of the molten steel light source E is reduced into a spectrum by using a light source receiver, and continuous shooting and photoelectric conversion are carried out by using an industrial camera I to obtain a molten steel temperature spectrum M;
decomposing the atomic characteristic spectrum composite light into spectral lines by using a spectrometer, and directly shooting and photoelectrically converting by using an industrial camera II to obtain an atomic composite spectrum G;
constructing a temperature database and an element database in a measuring computer, wherein the temperature database is realized by the following steps: the molten steel temperature range is as follows: 1500-1750 ℃, if the precision is 0.5 ℃, 500 grades are divided, in a heating container filled with inert gas, within a certain temperature range, the sample molten steel in the container is heated by grades according to a certain grade range to set the temperature precision, simultaneously, an industrial camera is used for shooting the temperature spectrum of each grade correspondingly, and the spectrum is converted into corresponding electric signals to be stored in a measuring computer database, namely, a temperature database is obtained; the implementation of the element database comprises: finding out the corresponding function relation between the atomic emission intensity corresponding to the atomic composite spectrum wavelength at a certain temperature of the molten steel and the contents of various chemical elements at a certain temperature of the molten steel through an element heating test; grading each element content according to intervals, grading according to the specific element content, heating a certain quantitative element according to each graded content at a certain temperature in a heating container filled with inert gas to melt or gasify the graded content element to obtain a corresponding value of the quantitative element between each graded content and the corresponding atomic emission intensity of the characteristic wavelength, simultaneously shooting the corresponding atomic emission intensity of the quantitative element between each graded content and the characteristic wavelength by an industrial camera, converting the corresponding atomic emission intensity into corresponding electric signals, and storing the corresponding electric signals in a measuring computer database to obtain an element database;
and the molten steel temperature spectrum M and the atomic composite spectrum G are sent to a measuring computer, and are respectively analyzed, calculated and compared with a temperature database and an element database stored in the measuring computer, so that the continuous, real-time and accurate online detection, display and control of the molten steel temperature and the components and contents of key chemical elements are realized.
The invention has the beneficial effects that: the invention has compact design, quick and convenient assembly, low equipment investment and reliable work, is not only suitable for large and small converters with different tonnages, but also suitable for various metallurgical furnaces with different tonnages in principle, including LD, OBM, AOD, EOF, EAF, foundry ladle, various secondary refining equipment (such as LF, CAS-OB, VOD and RH), a metal mixer, a continuous caster tundish and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a diagram of a system for continuously detecting the composition and temperature of molten steel;
FIG. 2 is a schematic diagram of atomic composite spectrum at a certain temperature of molten steel;
FIG. 3 is a schematic view of the composition of n elements in molten steel at a certain temperature.
Reference numerals: the device comprises a detection nozzle 1, a detection channel 2, a light source probe I3, a light source probe II4, an inert gas blowing inlet 5, an optical fiber cable interface 6, an optical fiber cable I7, an optical fiber cable II8, a light source receiver 9, an industrial camera I10, a spectrometer 11, an industrial camera II12, a temperature database 13, an element database 14 and a measurement computer 15.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The continuous detection system for molten steel components and temperature in the figure 1 mainly comprises a detection nozzle 1, a detection channel 2, a light source probe I3, a light source probe II4, an inert gas injection inlet 5, an optical fiber cable interface 6, an optical fiber cable I7, an optical fiber cable II8, a light source receiver 9, an industrial camera I10, a spectrometer 11, an industrial camera II12, a temperature database 13, an element database 14 and a measurement computer 15.
In FIG. 1, A represents a converter body of a steel converter, and B represents oxygen (O) blowing 2 ) Oxygen lance, D is molten steel liquid level, E is molten steel light source, theta is angle of inclination between detection probe 2 and molten steel liquid level D, ar/N 2 Inert gas, G atomic composite spectrum, and M temperature spectrum of molten steel light source E.
The detection probe 2 is fixedly arranged on a steelmaking converter body A, a light source probe I3 and a light source probe II4 are arranged in the upper portion of the detection probe 2 and are respectively connected with an optical fiber cable I7 and an optical fiber cable II8, and the other ends of the optical fiber cable I7 and the optical fiber cable II8 are respectively connected with a light source receiver 9 and a spectrometer 11. The upper end of the detection probe 2 is arranged outside the steelmaking converter body A and is respectively provided with Ar/N 2 Inert gas blowing inlet 5 and optical fiber cable connectionThe port 6 and the inert gas blowing inlet 5 are communicated with a channel hole of the detection probe 2, and the optical fiber cable interface 6 is used for quickly connecting and separating an optical fiber cable. The lower end of the detection channel 2 is provided with a detection nozzle 1, and the detection nozzle 1 is communicated with molten bath molten steel of the converter body. The industrial camera I10 and the industrial camera II12 are connected with a measuring computer 15 by cables, and the measured electric signals of the molten steel temperature spectrum M and the atomic composite spectrum G are respectively input into the measuring computer 15 and are analyzed, calculated and compared with a temperature database 13 and an element database 14 which are stored in the measuring computer 15.
The working principle of the molten steel component and temperature continuous detection system is as follows: a light source probe I3 and a light source probe II4 are arranged in the upper part of a channel hole of a detection channel 2, and the information of a molten steel light source E emitted by a converter body molten pool blowing cavity is synchronously grabbed. The information of the molten steel light source E is transmitted to the analysis unit through two paths of independent optical fibers I7 and II8, the optical fiber cable I7 is connected with the light source receiver 9, and the optical fiber cable II8 is connected with the spectrometer 11. The light source receiver 9 restores the spectrum of the molten steel light source E information, uses the industrial camera I10 to carry out continuous shooting and photoelectric conversion, inputs the corresponding electric signal of the molten steel temperature spectrum M into the measuring computer 15, and compares and analyzes the electric signal with the temperature database 13 stored in the measuring computer 15. The spectrometer 11 decomposes chemical elements and contents of molten steel, namely atomic characteristic spectrum composite light, contained in the information of the molten steel light source E into spectral lines, and uses an industrial camera II12 to carry out direct shooting and photoelectric conversion, and uses analysis software to analyze and calculate an atomic composite spectrum G measured by the molten steel and an element database 14 reflecting the relationship between the spectral wavelength intensity and the element content through a measurement computer 15. By conducting and processing the two paths of light source information, the detection system can realize continuous, real-time and accurate online detection, display and control on the temperature of the molten steel at the steelmaking end point of the converter and the components and contents of key chemical elements.
FIG. 2 is a schematic diagram of atomic composite spectroscopy in which x-coordinate is a spectral wavelength in nanometers (nm) corresponding to elemental composition of molten steel at a certain temperature; and the y coordinate is the atomic emission intensity corresponding to the spectral wavelength, and the unit is a.u., reflecting the concentration or content of the element components of the molten steel.
FIG. 3 is a schematic diagram showing the X coordinate of n elemental compositions at a certain temperature of molten steel, wherein the X coordinate represents all chemical elements in the molten steel composition, such as: fe. C, mn, N, etc.; the Y coordinate represents the content of the corresponding chemical element, such as: YFe, YN, YC, YMn, yn, etc.; the Z coordinate (pointing to the vertical page) represents the elemental grading temperature. Wherein the atomic emission intensity corresponding to the spectral wavelength of the Y-coordinate in figure 2 is a function of the amount of the chemical element of the Y-coordinate in figure 3.
Different elements are characterized by different atomic structures, and spectral lines generated by excitation are called characteristic spectra. Each species has its own energy level structure, and atoms are usually in a ground state and, when subjected to external excitation (heating), can move from the ground state to an excited state of higher energy. Due to the instability of the excited state, the atoms at the high energy level quickly return to the ground state, light with different wavelengths (frequencies) is emitted, and the light passes through the dispersion element (the spectrometer 11), so that the composite light emitted by the light source can be decomposed into spectral lines arranged in sequence of wavelengths, and the characteristic spectrum corresponding to each substance is obtained. The characteristic spectrum is determined by the components, the quantity and the structure of elements contained in the substance, and the emission intensity is different according to the different concentrations of the atoms of the elements to be measured, so that the quantitative determination of the element concentration can be realized. Therefore, the composition of the substance and the content of each component can be known by analyzing and comparing the characteristic spectrum of the substance, which is the theoretical basis of the thought of the measuring system.
Specifically, the molten steel excitation light source containing a plurality of different element components generates composite light composed of specific wavelengths of each element, the wavelengths are separated through the spectrometer 11, which can determine which element exists and the intensity of each wavelength of the wavelengths, the intensities and the concentrations of the corresponding elements form a certain functional relationship, namely, the content relationship of the corresponding elements is corresponded, meanwhile, an electronic receiving system (industrial camera II 12) is utilized to carry out information photoelectric conversion, the element characteristic spectrum temperature spectrum information is converted into an ordered atomic composite spectrum G electric signal, and then the electric signals are compared and processed by the measuring computer 15, so that the related elements and the content (concentration) in the molten steel can be measured.
The temperature database 13 and the element database 14 are the key points for realizing the idea of the measuring system, and the purpose is to accurately compare and calculate the molten steel temperature spectrum M and the element component atom composite spectrum G which are represented by the composite light of the molten steel light source E with the temperature database 13 and the element database 14 by using computer analysis software, thereby analyzing, judging and displaying the temperature of the molten steel in smelting operation, the content of contained elements and corresponding elements in real time on line.
Temperature database 13: the molten steel temperature range is as follows: 1500-1750 ℃, and if the precision is 0.5 ℃, the precision can be 500 grades. In a heating container filled with inert gas (such as argon), the sample molten steel in the container is heated within a certain temperature range (such as 1500-1750 ℃) step by step according to a certain grade range (such as 0-500 grade) to set temperature precision (such as 0.5 ℃), and meanwhile, an industrial camera is used for shooting the temperature spectrum of each grade correspondingly, and the temperature spectrum is converted into corresponding electric signals to be stored in a measuring computer 15 database, so that the temperature database 13 is obtained.
The element database 14: through an element heating test, the functional relationship between the atomic emission intensity corresponding to the spectral wavelength of the Y coordinate in fig. 2 and the content of the chemical element of the Y coordinate in fig. 3 is found. Each element content is also classified by interval, according to the specific element content (such as 100 grades), such as carbon element: 0.05% -5%, namely 5-500 equivalent, equivalent difference 0.01%, can be 495 grades. In a heating container filled with inert gas (such as argon gas), a certain quantitative element is heated according to the content of each grade at a certain temperature, so that the content of each grade element is melted or vaporized, the corresponding value of the atomic emission intensity of the quantitative element at each grade content and the corresponding characteristic wavelength can be obtained, meanwhile, an industrial camera is used for shooting the atomic emission intensity of the quantitative element at each grade content and the corresponding characteristic wavelength, and the atomic emission intensity is converted into corresponding electric signals which are stored in a measuring computer 15 database, namely, an element database 14 is obtained.
The composite light is randomly taken from the light source every time, but the light taken from the light source every time has spectrum corresponding to the light taken from the light source in the temperature database 13 and the element database 14, and the measured molten steel temperature and components are displayed through computer analysis, comparison and calculation. The error depends on the sample grading, and the error is within an acceptable range.
In order to collect continuous and clear molten steel emission light source information containing complex components, inert gas (Ar/N) is blown into a molten pool through an inert gas blowing inlet 5 at the upper end of a detection probe 2 2 ) The high-fidelity molten steel light source E primary color spectrum of the pulsating spherical cavity formed on the molten steel surface in front of the end part of the detection nozzle 1 can be clearly detected. An inert gas blowing inlet 5 at the upper end of the detection channel 2 is communicated with a channel of the optical fiber and the light source probe I3 and the light source probe II4 which are arranged in the detection channel 2, and the blown inert gas can ensure that slag on a molten steel detection part is discharged and purified, so that a molten steel light source E is clear, and can also blow and cool the optical fiber and the light source probe I3 and the light source probe II4 which are arranged in the detection channel 2. At the same time, the molten steel erosion of the probe nozzle 1 can be reduced. The inert gas sprayed into the molten pool by the detecting nozzle 1 floats upwards in the molten steel pool and diffuses into the furnace space above the smelting steel liquid level D.
The molten steel detection channel 2 is inclined upwards to form an angle theta with the molten steel liquid level D and is inserted into a molten pool, so that the molten steel is prevented from overflowing along the molten steel detection channel 2 due to blowing stop caused by accidents.
The light source receiver 9, the industrial camera I10, the spectrometer 11, the industrial camera II12, the measuring computer 15 and other detection and analysis equipment are connected with the optical fiber cable 8 through the optical fiber cable interface 6 and the optical fiber cable 7 (wherein the industrial camera I10 and the industrial camera II12 are respectively connected with the measuring computer 15 through cables), can be conveniently arranged in a nearby converter main control room, and has ideal working environment and convenient operation and maintenance. The optical fiber cable interface 6 is fixed on the molten steel detection probe 2, and the optical fiber cable interface 6 enables the optical fiber cable inside the converter molten steel detection probe 2 to be quickly connected and disconnected with the external optical fiber cable I7 and the optical fiber cable II8, so that the installation, maintenance and replacement of detection equipment such as the light source probe I3 and the light source probe II4 are facilitated.
The invention has compact design, quick and convenient assembly, low equipment investment and reliable work, and can realize continuous, real-time and accurate online detection, display and control of the molten steel temperature and the key chemical element components and contents at the steelmaking end point of the converter. The method is not only suitable for large and small converters with different tonnages, but also suitable for various metallurgical furnaces with different tonnages in principle, including LD, OBM, AOD, EOF, EAF, foundry ladle, various secondary refining equipment (such as LF, CAS-OB, VOD and RH), a metal mixer, a continuous caster tundish and the like. Because the traditional and expensive converter sublance probe mechanical device and control system are replaced, the investment of molten steel detection equipment and the operation, maintenance and repair costs are obviously reduced, the molten steel end point state can be accurately controlled, the steelmaking smelting period is greatly shortened, the consumption of a sublance detection probe in production can be avoided, various materials and alloys added in the steelmaking process are economical and optimized, the steelmaking cost is effectively reduced, and the yield is improved.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A molten steel composition and temperature continuous detection system is characterized in that: comprises a detection probe and an analysis unit which are arranged on a converter body A;
the detection probe is communicated with the inner space of the furnace body, the position of an inlet of the detection probe is higher than the liquid level D of the molten steel, and the detection probe and the liquid level D of the molten steel are inclined by an angle theta and inserted into the molten steel in the furnace body; a nozzle is arranged at the end part of the detection channel extending into the furnace, an inert gas injection inlet is arranged at the inlet of the detection channel, and the inert gas is Ar; a light source probe I and a light source probe II for acquiring the information of the molten steel light source E are arranged in the detection probe;
the analysis unit comprises a light source receiver, a spectrometer, an industrial camera I, an industrial camera II and a measurement computer, wherein the light source receiver, the spectrometer, the industrial camera I, the industrial camera II and the measurement computer are arranged in a main control chamber of the converter; the spectrometer is connected with an industrial camera II, and the industrial camera II is connected with a measuring computer; the light source probe I is connected with the light source receiver through an optical fiber cable I, and the light source probe II is connected with the spectrometer through an optical fiber cable II; the optical fiber cable I and the optical fiber cable II are connected or disconnected through an optical fiber cable interface arranged on the detection channel, and the optical fiber cable interface is arranged outside the steelmaking converter body at the upper end of the detection channel;
the light source probe I acquires information of a molten steel light source E, the information is restored into a spectrum through a light source receiver, and an industrial camera I is used for continuous shooting and photoelectric conversion to obtain a molten steel temperature spectrum M;
the light source probe II collects information of the molten steel light source E, the atomic characteristic spectrum composite light is decomposed into spectral lines through a spectrometer, and the spectral lines are directly shot and subjected to photoelectric conversion through an industrial camera II to obtain an atomic composite spectrum G;
the measurement computer receives the molten steel temperature spectrum M and the atomic composite spectrum G, and analyzes, calculates and compares the molten steel temperature spectrum M and the atomic composite spectrum G with a temperature database and an element database stored in the measurement computer respectively to realize continuous, real-time and accurate online detection, display and control of the molten steel temperature and the components and contents of key chemical elements;
the implementation of the temperature database comprises: the molten steel temperature range is as follows: 1500-1750 ℃, if the precision is 0.5 ℃, 500 grades are divided, in a heating container filled with inert gas, within a certain temperature range, the sample molten steel in the container is heated by grades according to a certain grade range to set the temperature precision, simultaneously, an industrial camera is used for shooting the temperature spectrum of each grade correspondingly, and the spectrum is converted into corresponding electric signals to be stored in a measuring computer database, namely, a temperature database is obtained;
the implementation of the element database comprises: finding out the corresponding function relation between the atomic emission intensity corresponding to the atomic composite spectrum wavelength at a certain temperature of the molten steel and the contents of various chemical elements at a certain temperature of the molten steel through an element heating test; the content of each element is also graded according to intervals, graded according to the specific element content, a certain quantitative element is heated according to the graded content at a certain temperature in a heating container filled with inert gas, the graded content element is melted or gasified, the corresponding value of the quantitative element between the graded content and the corresponding atomic emission intensity of the characteristic wavelength is obtained, meanwhile, an industrial camera is used for shooting the corresponding atomic emission intensity of the quantitative element between the graded content and the characteristic wavelength, and the corresponding atomic emission intensity is converted into corresponding electric signals to be stored in a measuring computer database, so that an element database is obtained.
2. A method for continuously detecting the components and the temperature of molten steel is characterized in that: the method comprises the following steps:
blowing Ar or N into the molten pool through detecting an inert gas blowing inlet on a detection channel 2 An inert gas;
acquiring a pulse spherical cavity high-fidelity molten steel light source E primary color spectrum formed on the surface of molten steel in front of the end part of a detection nozzle by a light source probe;
the information of the molten steel light source E is reduced into a spectrum by using a light source receiver, and continuous shooting and photoelectric conversion are carried out by using an industrial camera I to obtain a molten steel temperature spectrum M;
decomposing the atomic characteristic spectrum composite light into spectral lines by using a spectrometer, and directly shooting and photoelectrically converting by using an industrial camera II to obtain an atomic composite spectrum G;
constructing a temperature database and an element database in a measuring computer, wherein the temperature database is realized by the following steps: the molten steel temperature range is as follows: 1500-1750 ℃, if the precision is 0.5 ℃, 500 grades are divided, in a heating container filled with inert gas, within a certain temperature range, the sample molten steel in the container is heated by grades according to a certain grade range to set the temperature precision, simultaneously, an industrial camera is used for shooting the temperature spectrum of each grade correspondingly, and the spectrum is converted into corresponding electric signals to be stored in a measuring computer database, namely, a temperature database is obtained; the implementation of the element database comprises: finding out the corresponding function relation between the atomic emission intensity corresponding to the atomic composite spectrum wavelength at a certain temperature of the molten steel and the contents of various chemical elements at a certain temperature of the molten steel through an element heating test; grading each element content according to intervals, grading according to the specific element content, heating a certain quantitative element according to each graded content at a certain temperature in a heating container filled with inert gas to melt or gasify the graded content element to obtain a corresponding value of the quantitative element between each graded content and the corresponding atomic emission intensity of the characteristic wavelength, simultaneously shooting the corresponding atomic emission intensity of the quantitative element between each graded content and the characteristic wavelength by an industrial camera, converting the corresponding atomic emission intensity into corresponding electric signals, and storing the corresponding electric signals in a measuring computer database to obtain an element database;
and the molten steel temperature spectrum M and the atomic composite spectrum G are sent to a measuring computer, and are respectively analyzed, calculated and compared with a temperature database and an element database stored in the measuring computer, so that the continuous, real-time and accurate online detection, display and control of the molten steel temperature and the components and contents of key chemical elements are realized.
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| CN111868268B (en) * | 2018-03-19 | 2022-03-29 | 杰富意钢铁株式会社 | Molten metal component estimation device, molten metal component estimation method, and molten metal production method |
| US11808635B2 (en) | 2019-04-29 | 2023-11-07 | Chu LIEN | System for continuously detecting temperature and composition of molten steel during converter steelmaking |
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| CN110926619A (en) * | 2019-12-17 | 2020-03-27 | 湖北理工学院 | Continuous temperature measurement method for temperature of molten steel in steel ladle |
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| CN112525888A (en) * | 2020-10-21 | 2021-03-19 | 河钢股份有限公司 | Device and method for rapidly detecting temperature and components of vacuum induction furnace |
| CN112662841B (en) * | 2020-11-20 | 2022-07-15 | 首钢京唐钢铁联合有限责任公司 | CAS-OB refining automatic alloying control method and system |
| WO2022172771A1 (en) * | 2021-02-10 | 2022-08-18 | Ｊｆｅスチール株式会社 | Video-device-equipped electric furnace |
| CN113345533A (en) * | 2021-05-20 | 2021-09-03 | 华中科技大学 | Integrated type batching and feeding method and system for metal smelting |
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| CN201926508U (en) * | 2010-11-23 | 2011-08-10 | 长春工业大学 | Steel-making process and end-point control system based on on-line temperature and iron content measurement |
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