CN104535212A - Dual-probe sensor for measuring aluminum electrolyte temperature and primary crystal temperature - Google Patents
Dual-probe sensor for measuring aluminum electrolyte temperature and primary crystal temperature Download PDFInfo
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- CN104535212A CN104535212A CN201510021606.8A CN201510021606A CN104535212A CN 104535212 A CN104535212 A CN 104535212A CN 201510021606 A CN201510021606 A CN 201510021606A CN 104535212 A CN104535212 A CN 104535212A
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Abstract
The invention discloses a dual-probe sensor for measuring the aluminum electrolyte temperature and the primary crystal temperature. The dual-probe sensor comprises a probe I and a probe II, and each probe is composed of a temperature sensor and a protective casing. The upper portion of each temperature sensor is fixed to the corresponding protective casing. A sampling chamber is fixed to the bottom of the probe I and is composed of a middle groove and a measurement barrel, the upper portion of the inner wall of the middle groove is matched with the outer wall of the protective casing of the probe I, and the upper portion of the inner wall of the middle groove and the outer wall of the protective casing of the probe I are fixed together. A passage is arranged between the middle groove and the measurement barrel, and the sensor of the probe I is inserted into the measurement barrel through the passage. The dual-probe sensor is suitable for measurement of the temperature of electrolytes with various components; the sampling room at the bottom end of the probe I can protect the sensor against influences of melt flow, the attached electrolytes do not need to be treated in the process of repeated measurement, so operation is facilitated, and the service life of the protective casings can be prolonged beneficially. The device and method have the advantages of being accurate in measurement result, stable in repeated measurement and convenient to operate.
Description
Technical field
The present invention relates to a kind of aluminium electrolytic temperature measurement mechanism, particularly a kind of dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature.
Background technology
Metallic aluminium is produced by the aluminium oxide of electrochemical process reduction of dissolved in cryolite melts; Temperature and the liquidus temperature of measuring aluminium electrolyte is needed in production run.In recent years, the multiple method for measuring aluminium electrolyte temperature and liquidus temperature simultaneously of having come out one after another, these methods can be divided into two classes substantially: single temperature sensor technology and double temperature sensor technology.
Relative to single temperature sensor probe, the resolution of double temperature sensor technology to flex point is higher, be particularly suitable for testing aluminum fluoride content in electrolyte higher than 8% electrolytical liquidus temperature; But these two kinds of sensors all exist a common shortcoming, because cooling velocity in cooling procedure is too large, cause the electrolyte primary crystal temperature of mensuration on the low side compared with actual value; And measurement result is affected by environment comparatively large, and reappearance is poor; When again measuring in addition, the electrolyte in sample cup must be removed clean, cumbersome except operating, also by the life-span of impact probe.
The Chinese patent of Authorization Notice No. CN 102494789 B provides a kind of double temperature sensor device, and its principle measures heating curve to judge electrolytical liquidus temperature and the degree of superheat; But this device has electrolyte attachment when still there is duplicate measurements to a certain extent, when especially measuring high speed melt or the larger melt of fluctuation, cause the reappearance measuring liquidus temperature lower and reduce the problems such as sensor serviceable life.
Summary of the invention
The object of this invention is to provide a kind of dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature; by arranging sampling hut in the protective casing bottom of probe; temperature sensor bottom is made to be positioned at sampling hut; protection temperature sensor is not by the impact of melt flows; convenient operation, extends the life-span of protective casing.
The dual transducer probe of measurement aluminium electrolyte temperature of the present invention and liquidus temperature comprises probe I and probe II, and each probe is made up of a temperature sensor and a protective casing; The top of temperature sensor is fixed in protective casing; Wherein the bottom of probe I is fixed with a sampling hut, and sampling hut is made up of medial launder and measuring cylinder, and the merging that matches with the protective casing outer wall of probe I above medial launder inwall is fixed together; Be provided with passage between medial launder and measuring cylinder, the sensor of probe I is inserted in measuring cylinder by this passage.
In said apparatus, the protective casing bottom of probe II is provided with closed aperture, and the sensor bottom of probe II contacts with aperture diapire; Difference≤the 3mm of the external diameter of the sensor of small aperture and probe II.
In said apparatus, the measuring cylinder inwall 1 ~ 9 millimeter of sampling hut is extended in the bottom of the temperature sensor of probe I.
In said apparatus, the measuring cylinder internal diameter of sampling hut is at 2 ~ 10 millimeters.
Difference in level≤the 30mm of two temperature sensors of said apparatus.
In said apparatus, the top closure of the protective casing of probe I.
In said apparatus, the material selection iron of protective casing, nickel, copper or stainless steel; Described stainless steel is 310s, 304,316 or 316L stainless steel.
Above-mentioned temperature sensor is K type nickel chromium-nickel silicon thermocouple or S type platinum rhodium-platinum thermocouple.
The using method of above-mentioned measurement aluminium electrolyte temperature and the dual transducer probe of liquidus temperature is:
1, be connected with analytical instrument with the dual transducer probe of liquidus temperature by measurement aluminium electrolyte temperature, composition measures the device of aluminium electrolyte temperature and liquidus temperature; Described analytical instrument is the Thermocouple module together with computer assemblies, the potential difference meter together with computer assemblies or the multimeter together with computer assemblies;
2, two probes are rapidly inserted in the electrolyte of melting measure electrolytical temperature, by the temperature of analytical instrument record two probe, and set up Temperature-time relation curve; When the temperature that two probe measurements arrive is all invariable, stop record;
3, taken out from electrolyte by two probes, air cooling, to temperature≤300 DEG C, prepares to measure next time;
4, set up temperature difference-temperature curve, wherein temperature difference coordinate is the temperature difference that synchronization probe I records with probe II, and temperature coordinate is the temperature that probe II records; When stopping in temperature difference-temperature curve recording, temperature difference is 0, and the temperature that the probe II of this place's correspondence records is electrolyte temperature; The temperature that the probe II that in temperature difference-temperature curve, front first the peak point place of electrolyte temperature is corresponding records is electrolytical liquidus temperature.The electrolytical degree of superheat is the difference of electrolyte temperature and liquidus temperature.
The electrolyte temperature that installation method of the present invention is applicable to various composition is measured; The pop one's head in sampling hut of I bottom can protect sensor by the impact of melt flows, and duplicate measurements does not need the electrolyte processing attachment, convenient operation and be conducive to the life-span extending protective casing.It is accurate that device and method of the present invention has measurement result, and duplicate measurements is stablized, the effect of convenient operation.
Accompanying drawing explanation
Fig. 1 is probe I structural representation in the embodiment of the present invention;
Fig. 2 is probe II structural representation in the embodiment of the present invention;
In figure, 1, temperature sensor I, 2, protective casing I, 3, sampling hut, 4, temperature sensor II, 5, protective casing II, 6, aperture, 7, passage;
Fig. 3 is the temperature difference-thetagram obtained in the embodiment of the present invention 1; In figure, A is electrolyte temperature T
l, B is electrolytical liquidus temperature T
b.
Embodiment
Measuring error≤0. 5% of the temperature sensor adopted in the embodiment of the present invention.
The potential measurement precision of the potential difference meter adopted in the embodiment of the present invention and multimeter is 6 half.
Embodiment 1
The dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature comprises probe I and probe II, and each probe is made up of a temperature sensor and a protective casing; The top of temperature sensor is fixed in protective casing; Wherein the bottom of probe I is fixed with a sampling hut, and sampling hut is made up of medial launder and measuring cylinder, and the merging that matches with the protective casing outer wall of probe I above medial launder inwall is fixed together; Be provided with passage between medial launder and measuring cylinder, the sensor of probe I inserts in measuring cylinder by this passage; Measuring cylinder is tubular structure; Medial launder is trench structure;
The protective casing bottom of probe II is provided with closed aperture, and the sensor bottom of probe II contacts with aperture diapire; Small aperture is 0.5mm with the difference of the external diameter of the sensor of probe II;
The measuring cylinder inwall 1 millimeter of sampling hut is extended in the bottom of the temperature sensor of probe I;
The measuring cylinder internal diameter of sampling hut is at 2 millimeters;
Difference in level≤the 30mm of two temperature sensors;
The top closure of the protective casing of probe I;
The material selection iron of protective casing;
Temperature sensor is S type platinum rhodium-platinum thermocouple;
The using method of above-mentioned measurement aluminium electrolyte temperature and the dual transducer probe of liquidus temperature is:
1, be connected with analytical instrument with the dual transducer probe of liquidus temperature by measurement aluminium electrolyte temperature, composition measures the device of aluminium electrolyte temperature and liquidus temperature; Described analytical instrument is the Thermocouple module together with computer assemblies;
2, two probes are rapidly inserted in the electrolyte of melting measure electrolytical temperature, by the temperature of analytical instrument record two probe, and set up Temperature-time relation curve; When the temperature that two probe measurements arrive is all invariable, stop record;
3, taken out from electrolyte by two probes, air cooling, to temperature≤300 DEG C, prepares to measure next time;
4, set up temperature difference-temperature curve, wherein temperature difference coordinate is the temperature difference that synchronization probe I records with probe II, and temperature coordinate is the temperature that probe II records; When stopping in temperature difference-temperature curve recording, temperature difference is 0, and the temperature that the probe II of this place's correspondence records is electrolyte temperature; The temperature that the probe II that in temperature difference-temperature curve, front first the peak point place of electrolyte temperature is corresponding records is electrolytical liquidus temperature.The electrolytical degree of superheat is the difference of electrolyte temperature and liquidus temperature;
Electrolyte is heated to 975 ± 1 DEG C, the electrolytical of employing is made up of sodium fluoride, aluminum fluoride, calcium fluoride and aluminium oxide, and calcium fluoride accounts for 5% of electrolyte general assembly (TW), and aluminium oxide accounts for 5% of electrolyte general assembly (TW), all the other are sodium fluoride and aluminum fluoride, and the mol ratio of sodium fluoride and aluminum fluoride is 2.2:1;
Adopt above-mentioned electrolyte to test, taken out by two probes after completing from electrolyte, air cooling, to temperature≤300 DEG C, prepares to measure next time;
As shown in Figure 3, wherein temperature difference coordinate is the poor Δ T=T of synchronization probe I temperature recorded and II temperature recorded of popping one's head in the temperature difference-temperature curve set up
i-T
ii, T
ifor I temperature recorded of popping one's head in, T
iifor II temperature recorded of popping one's head in; Temperature coordinate is the temperature T that probe II records
ii;
When stopping recording, temperature difference is 0, and the temperature that the probe II of this place's correspondence records is electrolyte temperature T
l, be 976 DEG C according to this temperature of temperature difference-thetagram; The temperature that the probe II that in temperature difference-temperature curve, front first the peak point place of electrolyte temperature is corresponding records is electrolytical liquidus temperature T
b, be 947 DEG C according to this temperature of temperature difference-thetagram;
The liquidus temperature simultaneously adopting cooling curve method to record this electrolysis in said process is 947.3 DEG C, and in test process, the cooling velocity of control temperature sensor is 1 DEG C/min;
The result that measurement result and traditional experiment technology obtain is similar to, and measuring error is within galvanic couple error range.
Embodiment 2
Measure the dual transducer probe structure of aluminium electrolyte temperature and liquidus temperature with embodiment 1, difference is:
The measuring cylinder inwall 3 millimeters of sampling hut is extended in the bottom of the temperature sensor of probe I; The measuring cylinder internal diameter of sampling hut is at 5 millimeters; The material selection nickel of protective casing;
The protective casing bottom of probe II is provided with closed aperture, and the sensor bottom of probe II contacts with aperture diapire; Small aperture is 1mm with the difference of the external diameter of the sensor of probe II;
Temperature sensor is S type platinum rhodium-platinum thermocouple;
Using method is with embodiment 1, and described analytical instrument is the potential difference meter together with computer assemblies;
The result that measurement result and traditional experiment technology obtain is similar to, and measuring error is within galvanic couple error range.
Embodiment 3
Measure the dual transducer probe structure of aluminium electrolyte temperature and liquidus temperature with embodiment 1, difference is:
The measuring cylinder inwall 6 millimeters of sampling hut is extended in the bottom of the temperature sensor of probe I; The measuring cylinder internal diameter of sampling hut is at 8 millimeters; The material selection copper of protective casing;
The protective casing bottom of probe II is provided with closed aperture, and the sensor bottom of probe II contacts with aperture diapire; Small aperture is 2mm with the difference of the external diameter of the sensor of probe II;
Temperature sensor is K type nickel chromium-nickel silicon thermocouple;
Using method is with embodiment 1, and described analytical instrument is the Thermocouple module together with computer assemblies;
The result that measurement result and traditional experiment technology obtain is similar to, and measuring error is within galvanic couple error range.
Embodiment 4
Measure the dual transducer probe structure of aluminium electrolyte temperature and liquidus temperature with embodiment 1, difference is:
The measuring cylinder inwall 9 millimeters of sampling hut is extended in the bottom of the temperature sensor of probe I; The measuring cylinder internal diameter of sampling hut is at 10 millimeters; The material selection 316L stainless steel of protective casing;
The protective casing bottom of probe II is provided with closed aperture, and the sensor bottom of probe II contacts with aperture diapire; Small aperture is 3mm with the difference of the external diameter of the sensor of probe II;
Temperature sensor is K type nickel chromium-nickel silicon thermocouple;
Using method is with embodiment 1, and described analytical instrument is the multimeter together with computer assemblies;
The result that measurement result and traditional experiment technology obtain is similar to, and measuring error is within galvanic couple error range.
Claims (5)
1. measure a dual transducer probe for aluminium electrolyte temperature and liquidus temperature, comprise probe I and probe II, each probe is made up of a temperature sensor and a protective casing; The top of temperature sensor is fixed in protective casing; It is characterized in that: the bottom of probe I is fixed with a sampling hut, and sampling hut is made up of medial launder and measuring cylinder, and the merging that matches with the protective casing outer wall of probe I above medial launder inwall is fixed together; Be provided with passage between medial launder and measuring cylinder, the sensor of probe I is inserted in measuring cylinder by this passage.
2. a kind of dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature according to claim 1, is characterized in that the protective casing bottom of described probe II is provided with closed aperture, and the sensor bottom of probe II contacts with aperture diapire; Difference≤the 3mm of the external diameter of the sensor of small aperture and probe II.
3. a kind of dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature according to claim 1, is characterized in that the measuring cylinder inwall 1 ~ 9 millimeter of sampling hut is extended in the bottom of the temperature sensor of described probe I.
4. a kind of dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature according to claim 1, is characterized in that the measuring cylinder internal diameter of described sampling hut is at 2 ~ 10 millimeters.
5. a kind of dual transducer probe measuring aluminium electrolyte temperature and liquidus temperature according to claim 1, is characterized in that the difference in level≤30mm of two described temperature sensors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199926A (en) * | 2022-01-06 | 2022-03-18 | 吕梁学院 | Industrial molten salt electrolyte primary crystal temperature testing device and testing method |
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| CN114199926A (en) * | 2022-01-06 | 2022-03-18 | 吕梁学院 | Industrial molten salt electrolyte primary crystal temperature testing device and testing method |
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