CN1940547A - Internal slag heat current inspector and inspection for continuously-casting crystallizer - Google Patents
Internal slag heat current inspector and inspection for continuously-casting crystallizer Download PDFInfo
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- CN1940547A CN1940547A CN 200610095181 CN200610095181A CN1940547A CN 1940547 A CN1940547 A CN 1940547A CN 200610095181 CN200610095181 CN 200610095181 CN 200610095181 A CN200610095181 A CN 200610095181A CN 1940547 A CN1940547 A CN 1940547A
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Abstract
A method for detecting heat flow of slag diaphragm in continuous casting crystallizer includes adding 250g-500g slag sample when furnace temperature is at 1250-1350deg.c and holding temperature for 5-10min when furnace temperature is on 1400deg.c, obtaining temperature-time relation curve by measuring temperature variation of cooling water passing through metal probe to know density variation state of heat flow passing through slag diaphragm at different time. The device used for realizing said method is also disclosed.
Description
Technical field:
The present invention relates to use in the continuous casting steel machine crystallizer hot-fluid detection method and the device of covering slag, be applicable to the detection of covering slag slag film heat transfer characteristic in the continuous casting steel machine crystallizer.
Background technology:
In the continuous casting steel machine process; although the crystallizer protecting residue consumption is less; be generally 0.4～0.8 kilogram of ton steel; but the metallurgical function in crystallizer is very outstanding; should possess adiabatic heat-insulation, prevent the molten steel secondary oxidation, absorb the effect that molten steel come-up snotter, lubricated strand and control are conducted heat, to stabilizing continuous casting technology, enlarge the continuous casting kind, improve slab quality and output has great importance.Although covering slag uses the history of existing decades on continuous cast mold; but the covering slag that how to design conditions such as satisfying casting machine type, pulling rate and cast steel grade does not still have quantitative basis accurately; estimate the covering slag physical property and do not have the recognized standard; remain the internalist methodology of being formulated by some enterprises and measure, still dependence experience and site test effect are determined usually in the exploitation of covering slag.
Can not carry out directly relatively this problem in order to solve to the properties of product of various different continuous casting covering slag manufacturer, people attempt to set up continuous casting covering slag physicochemical property bioassay standard method.Most representative is the covering slag testing standard that American Iron and Steel Institute is set up, and measures content and comprises: 1) chemical constitution; 2) moisture; 3) spreadability; 4) temperature of fusion; 5) burn-off rate; 6) viscosity; 7) temperature of solidification; 8) Tc.Wherein attempt to utilize Tc to characterize the heat-transfer capability of covering slag in crystallizer; but in actual use; find to use the identical covering slag of Tc, the crystallizer heat flux is but not necessarily identical, and this explanation adopts Tc not comprehensive as the size of weighing the covering slag heat-transfer capability.
The experimental results shows that covering slag conducts heat size-controlled in solid slag film thickness, crystal area proportion and surfaceness in crystallizer.Slag membrane crystallization ratio and surfaceness are decided by the crystal property of covering slag, comprise Tc, crystallization ratio, crystalline material type and size etc., and these crystal properties of covering slag have cooling velocity and temperature field closely related.Measure at present the Tc of covering slag by differential thermal analysis (DTA) and differential scanning calorimetry (DSC) and heat wire method; measure the crystallization ratio of covering slag with methods such as image processing method and X diffraction approaches, the slag film forms and heat transfer condition has inconsistency in its experiment condition and the continuous cast mold.Utilize the result of gained to weigh the heat transfer property of covering slag indirectly, must cause the false result of bigger sum of errors.Therefore, exploitation and the service test angle from covering slag presses for a kind of more direct and accurate method and apparatus of representing covering slag heat-transfer capability size in crystallizer.
Based on the prior art background, can be in experiment lab simulation continuous cast mold slag film forming process, and the method that can directly measure the film hot-fluid of slagging tap is that patent of the present invention will solve key problem.The present invention is exactly the hot-fluid detection method and the device that will propose to use in a kind of continuous casting steel machine crystallizer covering slag.
Summary of the invention:
The objective of the invention is at above-mentioned the deficiencies in the prior art, proposed a kind of detection method and device that adds the direct mensuration covering slag slag film hot-fluid of thermalization slag and ultrasonic ranging location copper probe method based on cooling copper probe formation slag film, employing tubular furnace.
For achieving the above object, technical scheme of the present invention is:
Slag film hot-fluid detection method in the continuous cast mold the steps include:
(1), the covering slag calibration is equipped with;
(2), start the body of heater heating system, burner hearth is heated;
(3), the protection slag specimen that in body of heater, adds setting weight by graphite crucible;
(4), when furnace temperature reaches design temperature, the insulation setting-up time;
(5), in proving installation, feed the chilled water of setting flow;
(6), range measurement system detects the distance that metal probe should descend;
(7), start jacking system, the decline of drive metal probe;
(8), after metal probe arrives assigned address, stop jacking system;
(9), slag film hot-fluid test macro starts, and begins to gather heat flow data;
(10), after the fixed time, slag film hot-fluid test macro stops data collection, and deal with data.
A kind of pick-up unit of realizing detection method is characterized in that: comprise computer system, switch board, body of heater heating arrangement, jacking gear, range measurement system, cooling water pipeline; Be provided with crucible in the body of heater heating arrangement, the crucible bottom is provided with thermopair; Metal probe is arranged on the jacking gear, and jacking gear drives the metal probe lifting, is provided with cooling-water duct in the metal probe; Range measurement system is measured the distance that metal probe should descend, and as a controlled variable of jacking gear, makes metal probe can immerse in the liquid covering slag fully; Cooling water pipeline is provided with flowmeter, and the cooling-water duct in cooling water pipeline and the metal probe is connected, and the water side at cooling water pipeline is provided with temperature measuring equipment, measures the cooling water temperature of discharging.
The present invention utilizes the method that forms the slag film in the uniform melt cinder of high temperature melting by cooling copper probe, directly measures covering slag slag film hot-fluid.Method of the present invention can be simulated the continuous cast mold practical condition, reproduces slag film forming process in the continuous cast mold, accurately reflects the heat transfer property of covering slag; Testing of equipment favorable reproducibility of the present invention, equipment investment and maintenance cost are little, and be easy to operate.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing
Fig. 1 is the test flow chart of method of testing of the present invention;
Fig. 2 is a proving installation structural representation of the present invention;
Fig. 3 is that metal probe of the present invention (part 5) immerses liquid covering slag synoptic diagram;
Fig. 4 is that the present invention tests the temperature-time chart that obtains.
Embodiment
In Fig. 1, the operation steps of method of testing of the present invention is:
1, the covering slag calibration is equipped with; Preparation or preparation protection slag specimen, protection slag specimen of the present invention can be prescription of the prior art, performance has certain difference between the protection slag specimen of different formulations;
2, start the body of heater heating system, to body of heater, burner hearth heating;
3, the protection slag specimen that in body of heater, adds setting weight by graphite crucible; Normally put into slag specimen when furnace temperature reaches 1250 ℃-1350 ℃, the weight that adds in the proving installation of the present invention is 250g-500g, normally 300g; To not isometric body of heater, the weight of the protection slag specimen of its adding is different, mainly according to its volume decision addition;
4, when furnace temperature reaches design temperature, insulation a period of time; Temperature retention time 5-10min minute; Furnace temperature temperature of the present invention should be in the temperature range of molten steel under the normal condition, and for convenient test, the present invention is decided to be 1400 ℃ with this temperature.
But 5, the chilled water of supply orifice flow amount in proving installation, metal probe; Cooling water flow in the proving installation of the present invention
Amount is controlled at 300L/h;
6, range measurement system detects the distance that metal probe should descend; Range measurement system detects the distance that metal probe should descend according to the residing position height of metal probe, the difference in height with liquid level, the volume (cross-sectional area) of metal probe, the factors such as cross-sectional area of body of heater;
7, start jacking system, drive metal probe and descend, metal probe immerses in the liquid covering slag film;
8, after metal probe arrives and answers dropping distance, stop jacking system;
9, slag film hot-fluid test macro starts, and begins to gather heat flow data; Mainly be to open cooling water system, chilled water is flow through in metal probe, gather the leaving water temperature of chilled water;
10, after the fixed time, slag film hot-fluid test macro stops data collection, and deal with data, and slag film hot-fluid test macro stops then;
11, take out metal probe, and take out the slag film that adheres on the metal probe;
12, close chilled water;
13, then got back to for the 3rd step if continue to do experiment; If finish experiment, then powered-down.
The concrete operations of method of testing of the present invention: that will prepare, carbon-free covering slag 300g joins in the graphite crucible, (1250-1350 ℃) places the fusing that heats up in the body of heater (tubular type silicon molybdenum stove) when 1300 ℃ of left and right sides, treat that fire box temperature is stabilized in 1400 ℃, about insulation 10min (5-10min); Fire box temperature should be in the temperature range of molten steel under the normal condition, and the present invention is set at 1400 ℃, is the actual temp point that this test is adopted, and does not have special implication, can be higher or lower than this actual temp point, and should not be construed as is limitation of the present invention.Feed the chilled water that flow can be controlled then in proving installation, the chilled water water yield of the present invention is controlled at as 0.3m
3H
-1Utilize range measurement system (ultrasonic ranging system) to measure metal probe (the actual copper probe that adopts) and, determine copper probe dropping distance apart from slag liquid level distance; Start jacking system, drive the copper probe and descend; Jacking system of the present invention adopts jacking gears such as pneumatic, electronic, hydraulic pressure of the prior art, can drive the copper probe and descend and get final product; When the copper probe immerses liquid covering slag fully, pick up counting, make the upper surface of copper probe drop to concordant in the practical operation with liquid level; Gather the coolant water temperature degrees of data of turnover proving installation then, will pop one's head in again behind the 120s and from liquid covering slag, take out.Metal probe of the present invention (copper probe) is of a size of: length * wide * height=35mm * 20mm * 25mm is provided with cooling-water duct in the metal probe (copper probe), the chilled water intensification of absorbing heat in metal probe; Crucible size is: internal diameter * highly=60mm * 70mm.The present invention adopts the composition of the covering slag (can be described as the standard slag) that chemical pure material prepares and has related parameter as follows, its one-tenth be grouped into content be CaO-28%, SiO
2-34%, CaF
2-13%, Na
2CO
3-17%, AL
2O
3-3%, MgO-3%, Fe
2O
3-2%; Hemisphere point temperature T
Half=1081 ℃, viscosities il
1300 ℃=0.276Pa.S, Q
(hot-fluid)=0.3445MW/m
2
In Fig. 2,1-computer system, 2-switch board, 3-body of heater heating arrangement, 4-flowmeter, 5-metal probe, 6-thermopair, 7-jacking gear, 8-range measurement system, 9-crucible, 10-cooling water pipeline, 11-temperature measuring equipment;
Proving installation as shown in Figure 2 can be realized the testing procedure among Fig. 1; Mainly comprise computer system 1, switch board 2, body of heater heating arrangement 3, jacking gear 7, range measurement system 8, cooling water pipeline 10; Be provided with crucible 9 in the body of heater heating arrangement 3, crucible 9 bottoms are provided with thermopair 6, and 3 pairs of crucibles 9 of body of heater heating arrangement heat, and thermopair 6 is used to detect the temperature in the crucible 9, so that control its heating process, grasp its temperature; Metal probe 5 is arranged on the jacking gear 7, and jacking gear 7 drives metal probe 5 synchronization liftings, is provided with cooling-water duct in the metal probe 5; Range measurement system 8 is measured the distance that metal probe 5 should descend, and as a controlled variable of jacking gear 7, makes metal probe 5 can immerse liquid covering slag fully, and the upper surface of metal probe 5 is dropped to and the liquid level flush position; Cooling water pipeline 10 is provided with flowmeter 4, in order to control, show the flow of chilled water in it, cooling water pipeline 10 and metal probe 5 interior cooling-water ducts are connected, in the water side of cooling water pipeline 10, be provided with temperature measuring equipment 11, measure the cooling water temperature of discharging.
As a tentative proving installation, can be provided with separately between its above-mentioned each ingredient, independent separately the generation moved or effect.If as the higher proving installation of a cover automaticity, then need to increase the annexation of robotization action: be electrically connected with switch board 2 as computer system 1, thermopair 6, temperature measuring equipment 11 are electrically connected with computer system 1; Switch board 2 and body of heater heating arrangement 3, jacking gear 7, range measurement system 8, cooling water pipeline 10 is electrically connected, and switch board 2 produces that the control signals control signal of computer system 1 (or according to) are controlled said apparatus or parts produce the action that needs.
Jacking gear 7 adopts jacking gears such as pneumatic, electronic, hydraulic pressure of the prior art, can drive copper 5 liftings of popping one's head in and get final product.
Fig. 3 is that metal probe 5 immerses liquid covering slag synoptic diagram; 15-cooling water channel, 16-graphite crucible, 17-fire resistive material, 18-silicon molybdenum stove, 19-liquid covering slag, 20-so attitude slag film;
The metal probe 5 (copper probe) that is provided with cooling water channel 15 immerses in the liquid covering slag 19 under jacking gear 7 drives, and the upper surface of metal probe 5 is concordant with the liquid level of liquid covering slag 19; Liquid covering slag 19 is obtained by protection slag specimen high temperature melting, and liquid covering slag 19 is contained in the graphite crucible 16, and the graphite crucible 16 outer fire resistive materials 17 that insulation is set are silicon molybdenum stoves 18 outside the fire resistive material 17, and silicon molybdenum stove 18 has good heating properties; Outside surface at metal probe 5 forms one deck solid slag film 20.
The key technical indexes of the present invention:
● tested object: continuous crystallizer protecting slag
● the control panel of computing machine or instrument is controlled
● temperature control scope: 100～1600 ℃
● temperature-controlled precision: ± 10 ℃
● lifting travel: 600mm
● lifting precision: ± 1mm
Hot-fluid test error: ± 2%
As shown in Figure 4, be that the present invention tests the temperature-time chart that obtains.
Collect the chilled water water temperature of discharge by the temperature measuring equipment 11 that is positioned at outlet end, obtain this temperature-time chart, as shown in Figure 4.According to importing and exporting water temperature difference, can calculate the different heat flow densities of passing through the slag film constantly by following formula.
Φ＝K·W·CΔT/(F·1000)
In the formula: Φ-heat flow density, MWm
-2K-instrument constant; W-probe cooling water flow, kgs
-1Δ T-probe is imported and exported water temperature difference, ℃; F-effective heat transfer area of popping one's head in, m
2C-specific heat of water, kJ (kg ℃)
-1
As seen from Figure 4, obviously there is three phases in the cooling water temperature variation in slag film forming process.Moment t
1Corresponding leaving water temperature T
1Be temperature the highest in temperature-time chart, it has represented that copper probe immerses in the liquid covering slag, and the solid slag film forms initial stage, main reflection this moment be heat transfer between liquid covering slag is popped one's head in copper, therefore, the heat flow density maximum.From moment t
1To moment t
2Leaving water temperature reduces very fast, and this is stage formation phase of solid slag film, and the slag film of following glassy state simultaneously is the formation of crystallization and air gap again, and it is bigger to make that hot-fluid reduces slope.Moment t
2After enter stage stable growth phase of solid slag film, the solid slag film thickness slowly increases, institute is so that this stage hot-fluid slowly descends.By a large amount of experiments, at t
2The slag film thickness that constantly obtains is 1～3mm, and this slag film thickness is approaching with the slag film thickness that obtains on actual casting machine, so the present invention t constantly
2Corresponding leaving water temperature T
2The heat flow density that calculates characterizes the heat-transfer capability size of covering slag.
For different proving installations, its instrument constant K is different, and the present invention tests by triplicate, averages and the standard value comparison, determines instrument constant K value; Its operation steps is identical with aforesaid step, and just triplicate compares according to its mean value and standard value again, determines instrument constant K value.
The present invention obtains the subsidy of state natural sciences fund (No.50574109) and iron and steel associating fund (No.50374086), is national innovation item.
Claims (4)
1, slag film hot-fluid detection method in the continuous cast mold the steps include:
(1), the covering slag calibration is equipped with;
(2), start the body of heater heating system, to body of heater, burner hearth heating;
(3), the protection slag specimen that in body of heater, adds setting weight by graphite crucible;
(4), when furnace temperature reaches design temperature, the insulation setting-up time;
(5), in proving installation, metal probe, feed the chilled water of setting flow;
(6), range measurement system detects the distance that metal probe should descend;
(7), start jacking system, the decline of drive metal probe;
(8), distance that descend to measure of metal probe, arrive assigned address after, stop jacking system;
(9), slag film hot-fluid test macro starts, and begins to gather chilled water leaving water temperature heat flow data;
(10), after the fixed time, slag film hot-fluid test macro stops data collection, and deal with data.
2, slag film hot-fluid detection method in the continuous cast mold according to claim 1 is characterized in that: add the 250g-500g slag specimen when furnace temperature reaches 1250 ℃-1350 ℃; When furnace temperature reaches 1400 ℃, temperature retention time 5-10min minute.
3, a kind of pick-up unit of realizing the described detection method of claim 1 is characterized in that: comprise computer system (1), switch board (2), body of heater heating arrangement (3), jacking gear (7), range measurement system (8), cooling water pipeline (10); Be provided with crucible (9) in the body of heater heating arrangement (3), crucible (9) bottom is provided with thermopair (6); Metal probe (5) is arranged on the jacking gear (7), and jacking gear (7) drives metal probe (5) lifting, and metal probe is provided with cooling-water duct in (5); Range measurement system (8) is measured the distance that metal probe (5) should descend, and as a controlled variable of jacking gear (7), makes metal probe (5) can immerse liquid covering slag fully; Cooling water pipeline (10) is provided with flowmeter (4), and the cooling-water duct in cooling water pipeline (10) and the metal probe (5) is connected, and the water side in cooling water pipeline (10) is provided with temperature measuring equipment (11), measures the cooling water temperature of discharging.
4, pick-up unit according to claim 3 is characterized in that: computer system (1) is electrically connected with switch board (2), and thermopair (6), temperature measuring equipment (11) are electrically connected with computer system (1); Switch board (2) and body of heater heating arrangement (3), jacking gear (7), range measurement system (8), cooling water pipeline (10) is electrically connected, switch board (2) produces control signal or controls body of heater heating arrangement (3) according to the control signal of computer system (1), jacking gear (7), range measurement system (8), cooling water pipeline (10) produces action.
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| CN100495006C CN100495006C (en) | 2009-06-03 |
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| CN102507637A (en) * | 2011-09-28 | 2012-06-20 | 中南大学 | Device for simulating and measuring heat flux of continuous casting covering slag |
| CN102661967A (en) * | 2012-04-26 | 2012-09-12 | 中南大学 | Heat flow simulation test device of crystallizer meniscus horizontal heat transfer |
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| CN102039385A (en) * | 2010-11-29 | 2011-05-04 | 东北大学 | Method for determining thicknesses of solid-liquid slag lubricating films on basis of temperature measuring continuous-casting mold of thermoelectric couple |
| CN102039385B (en) * | 2010-11-29 | 2012-08-29 | 东北大学 | Method for determining thicknesses of solid-liquid slag lubricating films on basis of temperature measuring continuous-casting mold of thermoelectric couple |
| CN102507637A (en) * | 2011-09-28 | 2012-06-20 | 中南大学 | Device for simulating and measuring heat flux of continuous casting covering slag |
| CN102661967A (en) * | 2012-04-26 | 2012-09-12 | 中南大学 | Heat flow simulation test device of crystallizer meniscus horizontal heat transfer |
| CN102717040A (en) * | 2012-06-11 | 2012-10-10 | 内蒙古包钢钢联股份有限公司 | Measurement method for temperature protection of continuous casting tundish covering agent |
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| CN106493318A (en) * | 2016-11-02 | 2017-03-15 | 武汉科技大学 | A kind of preparation method of smelting iron and steel system water model experiment covering slag |
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| CN115808441A (en) * | 2023-02-08 | 2023-03-17 | 北京科技大学 | Device and method for testing heat transfer performance of metallurgical covering slag |
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