CN103323483A - Double-wire test method for melting and crystallization properties - Google Patents

Double-wire test method for melting and crystallization properties Download PDF

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Publication number
CN103323483A
CN103323483A CN2013102935502A CN201310293550A CN103323483A CN 103323483 A CN103323483 A CN 103323483A CN 2013102935502 A CN2013102935502 A CN 2013102935502A CN 201310293550 A CN201310293550 A CN 201310293550A CN 103323483 A CN103323483 A CN 103323483A
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China
Prior art keywords
temperature
control
thermocouple
heating
thermocouple wires
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Pending
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CN2013102935502A
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Chinese (zh)
Inventor
施金良
吴云君
贾碧
马琼
许弟建
张亚军
王华斌
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Chongqing University of Science and Technology
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Chongqing University of Science and Technology
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Priority to CN2013102935502A priority Critical patent/CN103323483A/en
Publication of CN103323483A publication Critical patent/CN103323483A/en
Pending legal-status Critical Current

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Abstract

The invention provides a double-wire test method for melting and crystallization properties. According to the invention, 1) two thermocouple wires are arranged in a heating furnace, a to-be-melted material is arranged between the two thermocouple wires, each thermocouple wire is connected with a heating power supply through a control device so as to function as a resistive heater to generate heat, a camera is arranged above the heating furnace to collect images of heating of the material and transmit the images to a computer processing device, and a set temperature difference value is formed between the two thermocouple wires; and 2) each thermocouple wire functions as a temperature measuring probe at the same time and is connected with a temperature measuring device, and under the controlling of the control device, temperature signals of the thermocouple wires are sent to the temperature measuring device and the computer processing device. According to the test method provided by the invention, the two thermocouple wires respectively and independently carry out temperature measurement and temperature control, a to-be-tested sample is placed in an environment with a temperature difference, a temperature field between the wall of a continuous casting crystallizer and a casting blank is simulated, and the melting and crystallization conditions of the material between the wall of the continuous casting crystallizer and the casting blank are determined. Furthermore, the whole process of melting and crystallization of the material can be observed on line.

Description

Double-thread method fusing and crystal property method of testing
Technical field
The present invention relates to the fusing of related component in a kind of smelting iron and steel and the method for testing that crystal property is measured, especially double-thread method fusing and crystal property method of testing.
 
Background technology
In the smelting iron and steel industry, the material composition that blast-furnace slag, slag and continuous casting covering slag produce as steel smelting procedure, or the protection component of adding in the molten steel, physics, chemical property index that it can directly affect molten steel directly determine the height of steel quality etc.; As, beginning temperature of fusion, molten temperature region, Tc and the percent crystallization in massecuite etc. of blast-furnace slag, slag and covering slag all are important physical performance indexs, for improve the quality of products, energy savings all has great significance.
The control of continuous casting covering slag crystallization behavior is for reducing surface defect of bloom and guaranteeing that the direct motion of strand is significant.In continuous casting is produced; continuous casting covering slag is fused into slag under the high-temperature molten steel effect, infiltrate between crystallization wall and strand, owing to there being larger temperature difference between strand and the crystallizer; slag meeting at night crystallize out after the fusing needs to study the poor lower covering slag crystallization process of different temperature fields for this reason.
At present, Tc mensuration is the most often adopted differential thermal analysis, crystallization process and percent crystallization in massecuite are measured normal employing monofilament method, but also there is following problem in said method:
1, can not simulate temperature difference between crystallization wall and the steel billet, measurement result and true environment there are differences;
2, can not measure different temperature fields poor time, the crystallization of slag specimen and heat transfer situation.
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Summary of the invention
For above-mentioned deficiency of the prior art, fundamental purpose of the present invention is to overcome can not the online observation material melting, solidify and the process of crystallization of prior art under different temperatures, especially can not simulate the deficiencies such as temperature difference between the crystallization wall and steel billet in the STEELMAKING PRODUCTION, a kind of double-thread method fusing and crystal property method of testing are provided.
Technical scheme of the present invention is as follows: double-thread method fusing and crystal property method of testing is characterized in that: 1) two thermocouple wires are set in heating furnace, and the spacing between two thermocouple wires satisfies technique will
Ask; Material to be melted is set between two thermocouple wires, and every thermocouple wire is connected as resistive heater with heating power supply through control device, produces heat; Camera is set in order to gather material from initial heating, until the image of the whole process that all melts above heating furnace; Microscope perhaps is set above heating furnace, and the image of material is after microscope amplifies, again by camera collection; Camera is transported to computer processor unit with the image that gathers, and stores and processes;
Control device is controlled respectively the heating-up temperature of every thermocouple wire according to setting program, forms the temperature gap of setting between two thermocouple wires;
2) every thermocouple wire is connected with temperature measuring equipment simultaneously as temperature probe; In the control device control
System is lower, and the temperature signal of this thermocouple wire is transported to temperature measuring equipment, and temperature measuring equipment is transported to temperature signal in the computer processor unit again, stores and processes.
Further feature is: described temperature gap, and more than or equal to zero.
Also the material after the collection fusing is at the image of stopped heating post crystallization process.
With respect to prior art, double-thread method fusing of the present invention and crystal property method of testing have following beneficial effect:
1, the present invention adopts the double-thread method test, with two thermocouple wires independent thermometrics of difference and temperature control, can make and be placed on two tested sample between the thermocouple wire hot junction and be under the temperature difference, temperature field between simulation continuous casting crystallining wall and the strand, measure fusing, the crystallization situations of material between crystallization wall and strand such as continuous casting covering slag, for material performance research provides a kind of new means;
2, utilize image recognition technology, can calculate the crystallization area of measured object under different temperatures is poor;
3, the present invention namely works as heating element with traditional thermocouple wire and works as again temperature element, and after utilizing microscope to amplify, by camera collection material melting and crystallization process image, realizes the overall process of online observation material melting and crystallization;
4, equipment power dissipation is low, testing efficiency is high, and the test result accuracy is higher.
Description of drawings
Fig. 1 is double-thread method fusing of the present invention and crystal property method of testing structural representation;
Fig. 2 is pick-up unit control structure schematic diagram of the present invention;
Fig. 3 is device for detecting performance structural representation of the present invention.
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Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Double-thread method fusing of the present invention and crystal property method of testing as shown in Figure 1, 2, is characterized in that:
1, two thermocouple wires are set in heating furnace, the spacing between two thermocouple wires satisfies technological requirement, and available staff is regulated; Material to be melted is set between two thermocouple wires, and every thermocouple wire is connected as resistive heater with heating power supply through control device, produces heat; Camera is set in order to gather material from initial heating, until the image of the whole process that all melts above heating furnace; Microscope perhaps is set above heating furnace, and the image of material is after microscope amplifies, again by camera collection; Camera is transported to computer processor unit with the image that gathers, and stores and processes;
Control device specifically can adopt the PWM modulation system according to setting program, controls respectively the heating-up temperature of every thermocouple wire, forms the temperature gap of setting between two thermocouple wires; This temperature gap, more than or equal to zero, minimum can be zero, namely the temperature between two thermocouple wires equates, also can reach tens degree even upper Baidu, adjusts according to technological requirement.
2, every thermocouple wire is connected with temperature measuring equipment simultaneously as temperature probe; In the control device control
System is lower, and the temperature signal of this thermocouple wire is transported to temperature measuring equipment, and temperature measuring equipment is transported to temperature signal in the computer processor unit again, stores and processes.
After outage, the temporary transient no power of this root thermocouple wire, do not produced heat, it just can be used as temperature probe, is connected with temperature measuring equipment, and the temperature signal of this thermocouple wire is transported to temperature measuring equipment.
The present invention, with traditional thermocouple wire, such as platinum rhodium thermocouple silk etc., not only work as heating element but also work as temperature element, perhaps in turn when heating element or temperature element, and after utilizing microscope to amplify, by camera collection material melting and crystallization process image, realize the overall process of online observation material melting and crystallization.The present invention is placed on tested sample between two thermocouple wire hot junctions, owing between two thermocouple wires temperature difference being arranged, tested sample is under the temperature difference, and the temperature field between simulation continuous casting crystallining wall and the strand is for material performance research provides a kind of new means.
Measurement mechanism of the present invention as shown in Figure 1, mainly is comprised of heating furnace (miniature furnace), control device (control box), microscope, camera (comprising image pick-up card) and computer processor unit (host computer); Two thermocouple wires are arranged in the miniature furnace, and distance each other satisfies technological requirement; Material to be melted is arranged between two thermocouple wires, two thermocouple wires are namely worked as heating element (resistive heater) again when temperature element (temperature probe), carry out temperature control and temperature signal collection by control device, pass to computer processor unit (host computer) by the RS232 communication, host computer is by material to be melted in capture card and the camera collection heating furnace image along with the rising of temperature, or gather through the image after the microscope amplification, image can be amplified a lot of times, as amplifying 40-80 doubly; On the computer screen of host computer, demonstrate in real time more clearly image, and carry out Image Saving according to user's setting means, but by the image off-line analysis after preserving and calculating material percent crystallization in massecuite.Control device adopts intelligent control algorithm, and temperature-controlled precision is high.Thermocouple wire is as heating element, under control device control, heating after the energising, heat material to be melted, such as blast-furnace slag, slag and continuous casting covering slag or other blast furnace burden, because the fusing point of thermocouple wire is higher than the fusing point of material to be melted, therefore after being heated to melting temperature, material to be melted just begins fusing until all melt, and whole process can both show intuitively; And by the control of control device, the stopped heating that can also in time cut off the power supply behind material melting makes material Step crystallization in cooling of fusing, can observe the image of its crystallization process.
In Fig. 2, thermocouple wire heating of the present invention drives principle of work with thermometric
Can carry out for the heating that makes thermocouple wire and the measurement of temperature, two thermocouple wires are namely worked as again temperature element when heating element, can distinguish independent thermometric and temperature control.Except adopting control device and the operation circuit of prior art, the invention provides specialized designs hardware driving circuit as shown in Figure 2, use metal-oxide-semiconductor as power component in the circuit, thermocouple wire energising heating when the MOS conducting, carry out temperature survey during the MOS cut-off, controlled by the single-chip microcomputer generation pwm signal of control device.Because the thermocouple wire power-off time is shorter, on continuous meaning, heating is carried out simultaneously with measurement.
In addition, the control system that the present invention relates to and software thereof satisfy the basic functions such as heat control and temperature detection that add of the present invention; Mainly comprise: 1) system's slave computer software: based on the scm software design, mainly carry out temperature control by intelligent control algorithm, temperature-controlled precision is high; Temperature signal is gathered and digital filtering; Receive the host computer instruction and the signals such as temperature are transferred to host computer, possess in addition demonstration, parameter setting, the functions such as hand, automatic control have good interoperability.
2) system's upper computer software: based on the programming under the Windows operating system, mainly test parameter is set, such as the design temperature curve, picture catching mode etc.; Drawing of Curve; Check historical data etc., have good human-computer interaction interface.
Shown in Figure 3, two thermocouple wires 2 are arranged in the heating furnace 1, adjust the distance between it; Material to be melted is set between two thermocouple wires 2; Camera 3 is set on heating furnace 1, over against heating furnace 1, gathers the image in the heating furnace 1; Perhaps, a microscope 4 is set first, camera 3 gathers the image that amplifies after processing through microscope 4 over against microscope 4; Camera 3, is processed and is stored in the image input computer processor unit 8 that gathers with capture card 6.Thermocouple wire 2 is connected with power supply through controller 5, heating power under controller control; Simultaneously, thermocouple wire 2 is as temperature probe, be connected with temperature measuring equipment 7, under controller 5 effects, temperature measuring equipment 7 is connected with computer processor unit 8, or is connected with computer processor unit 8 by controller 5, the temperature signal of thermocouple wire 2 collections is inputted in the computer processor unit 8, process and store.Controller 5 can adopt independent control mode, also can be connected with computer processor unit 8, and the control signal that sent by computer processor unit 8 produces action.
Need to prove, above embodiment is only in order to technical solution of the present invention to be described but not the restriction technologies scheme, although the applicant has been described in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, those are made amendment to technical scheme of the present invention or are equal to replacement, and do not break away from aim and the scope of the technical program, all should be encompassed in the middle of the claim scope of the present invention.

Claims (3)

1. double-thread method melts and the crystal property method of testing, it is characterized in that:
1) two thermocouple wires are set in heating furnace, the spacing between two thermocouple wires is adjusted according to arts demand; Material to be melted is set between two thermocouple wires, and every thermocouple wire is connected as resistive heater with heating power supply by control device, produces heat; Camera is set in order to gather material from initial heating, until the image of the whole process that all melts above heating furnace; Microscope perhaps is set above heating furnace, and the image of material is after microscope amplifies, again by camera collection; Camera is transported to computer processor unit with the image that gathers, and stores and processes;
Control device is controlled respectively the heating-up temperature of every thermocouple wire according to setting program, forms the temperature gap of setting between two thermocouple wires;
2) every thermocouple wire is connected with temperature measuring equipment simultaneously as temperature probe; In the control device control
System is lower, and the temperature signal of this thermocouple wire is transported to temperature measuring equipment, and temperature measuring equipment is transported to temperature signal in the computer processor unit again, stores and processes.
2. described double-thread method melts and the crystal property method of testing according to claim 1, it is characterized in that: described temperature gap, and more than or equal to zero.
3. want 1 or 2 described double-thread method fusing and crystal property method of testings according to right, it is characterized in that: also the material after the collection fusing is at the image of stopped heating post crystallization process.
CN2013102935502A 2013-07-12 2013-07-12 Double-wire test method for melting and crystallization properties Pending CN103323483A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN2013102935502A CN103323483A (en) 2013-07-12 2013-07-12 Double-wire test method for melting and crystallization properties

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104155329A (en) * 2014-08-12 2014-11-19 重庆大学 Continuous casting crystallizer protection slag solidification crystallization property test method
CN105092406A (en) * 2015-07-07 2015-11-25 中南大学 Novel furnace slag crystallization process thermogravimetric test device and test method
CN105302952A (en) * 2015-10-20 2016-02-03 首钢总公司 Finite element method for predicting spring steel casting blank decarburization
CN110918919A (en) * 2019-12-13 2020-03-27 中南大学 Method for controlling uniform crystallization of casting powder and eliminating needle-shaped crystals

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102445464A (en) * 2011-09-28 2012-05-09 中南大学 Dual-thermocouple test apparatus for crystallization property of continuous casting mould casting powder

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
CN102445464A (en) * 2011-09-28 2012-05-09 中南大学 Dual-thermocouple test apparatus for crystallization property of continuous casting mould casting powder

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Title
CHRISTIAN THALES MUTALE, ET AL: "《Observation of the Crystallization Behavior of a Slag Containing 46 Wt Pct CaO, 46 Wt Pct SiO2, 6 Wt Pct Al2O3, and 2 Wt Pct Na2O using the Double Hot Thermocouple Technique》", 《METALLURGICAL AND MATERIALS TRANSACTIONS B》 *
古可专: "《连铸保护渣传热机理研究》", 《中南大学硕士学位论文》 *
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104155329A (en) * 2014-08-12 2014-11-19 重庆大学 Continuous casting crystallizer protection slag solidification crystallization property test method
CN105092406A (en) * 2015-07-07 2015-11-25 中南大学 Novel furnace slag crystallization process thermogravimetric test device and test method
CN105302952A (en) * 2015-10-20 2016-02-03 首钢总公司 Finite element method for predicting spring steel casting blank decarburization
CN110918919A (en) * 2019-12-13 2020-03-27 中南大学 Method for controlling uniform crystallization of casting powder and eliminating needle-shaped crystals

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Inventor after: Jia Bi

Inventor after: Wu Yunjun

Inventor after: Shi Jinliang

Inventor after: Ma Qiong

Inventor after: Xu Dijian

Inventor after: Zhang Yajun

Inventor after: Wang Huabin

Inventor before: Shi Jinliang

Inventor before: Wu Yunjun

Inventor before: Jia Bi

Inventor before: Ma Qiong

Inventor before: Xu Dijian

Inventor before: Zhang Yajun

Inventor before: Wang Huabin

C53 Correction of patent for invention or patent application
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Free format text: CORRECT: INVENTOR; FROM: SHI JINLIANG WU YUNJUN JIA BI MA QIONG XU DIJIAN ZHANG YAJUN WANG HUABIN TO: JIA BI WU YUNJUN SHI JINLIANG MA QIONG XU DIJIAN ZHANG YAJUN WANG HUABIN

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Application publication date: 20130925

C12 Rejection of a patent application after its publication