CN103759835A - System and method for full-automatic continuity noncontact measurement of primary crystal temperature of aluminum electrolytes - Google Patents
System and method for full-automatic continuity noncontact measurement of primary crystal temperature of aluminum electrolytes Download PDFInfo
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Abstract
The invention discloses a system and method for full-automatic continuity noncontact measurement of the primary crystal temperature of aluminum electrolytes. The system comprises a plurality of measurement units, a noncontact temperature sensor, a temperature control subsystem, a motion control subsystem and a data collecting and processing subsystem, wherein the noncontact temperature sensor is used for measuring the temperature of samples of the aluminum electrolytes in heating furnaces of the measurement units, the temperature control subsystem is used for controlling the temperature inside the heating furnaces of the measurement units, the motion control subsystem is used for controlling transmission structures of the measurement units, and the data collecting and processing subsystem is used for collecting and processing temperature data. The system is applicable to measuring the primary crystal temperature of aluminum electrolytes composed of various components and high in sensitivity, and resists interference, the ms-grade response measurement of real-time variable temperature is achieved, the delay error of thermocouple measurement in the variable temperature is reduced, and meanwhile the waste caused when thermocouples are used as consumables for replacement is avoided.
Description
Technical field
The present invention relates to electrolyte smelting technique, particularly relate to a kind of system and method for full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte.
Background technology
Aluminium electrolyte electrolysis temperature and liquidus temperature are technological parameters important in Aluminium Electrolysis.Differential thermal between electrolysis temperature and liquidus temperature (degree of superheat) has very close relationship with the electrolytic tank thermal equilibrium of electrolytic process.If can accurately obtain the liquidus temperature of each electrolytic tank, just can accurately hold electrolysis temperature, to the power consumption of each electrolytic tank, just can quantitatively control, to energy-saving and cost-reducing, have very great help.The at present domestic equipment that has manufacturer production to measure electrolyte primary crystal temperature, its equipment principle is to adopt nature cooling curve method, but existing equipment adopts nature cooling while measuring, rate of temperature fall is uncontrollable, therefore inevitably can cause the generation of electrolytical segregation and supercooling phenomenon, and due to hysteresis quality of thermocouple temperature measurement etc., cause measurement result inaccurate; High temperature and the severe corrosive of aluminium electrolyte, very easily damage temperature thermocouple simultaneously, needs often to change thermopair, and can only measure an electrolyte sample at every turn, and measuring equipment dismounting is also cumbersome, has increased production cost, system maintenance, and efficiency is lower.
Summary of the invention
The object of the invention is to, a kind of system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte is provided, this system is applicable to the liquidus temperature of aluminium electrolyte of various compositions and measures, highly sensitive, anti-interference, to realize real-time change temperature ms level response measurement, reduced the delay error of thermocouple measurement in transformation temperature, the wasteness of simultaneously having avoided thermopair to change as consumptive material.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte, described system comprises several measuring units, the heating furnace 5 that has cavity 10 in arbitrary measuring unit comprises, heating furnace 5 places, axle center, top arrange the aperture 11 communicating with cavity 10, heating furnace 5 belows arrange the bracket 7 that can put into cavity 10, described bracket 7 bottoms arrange O-ring seal 12, enclosed cavity 10 while putting into cavity 10 for bracket 7, described bracket 7 is arranged on height adjuster 8, described height adjuster 8 carries out height by the first drive mechanism 2 being connected and the second drive mechanism 4 coordinated drive and regulates and rotate,
Described arbitrary measuring unit also comprises the 3rd drive mechanism 6, and described the 3rd drive mechanism 6 drives material loading swing arm 9, and the crucible 3 that is placed on material loading swing arm 9 tache motorices is placed on bracket 7, thereby make crucible enter cavity 10, heats;
Described system also comprises at least one non-contact temperature sensor 1, and described non-contact temperature sensor 1 is arranged on aperture 11 tops, for measuring the temperature of crucible 3 aluminium electrolyte samples;
Described system also comprises temperature control subsystem 14, motion control subsystem and data acquisition process subsystem, temperature in described temperature control subsystem controls cavity 10, described motion control subsystem is for controlling the transmission of drive mechanism and the movement of non-contact temperature sensor 1, and described data acquisition subsystem is for electrolyte temperature data acquisition and processing (DAP).
Preferably, the number of described measuring unit is six, and the number of described non-contact temperature sensor 1 is two, and those skilled in the art are the number of State selective measurements unit and non-contact temperature sensor as required.
Preferably, described non-contact temperature sensor 1 is infrared temperature instrument, and those skilled in the art can select the kind of other non-contact temperature sensors as required.
Preferably, in described cavity 10, be provided with heat-preservation liner 13.
Preferably, described heating furnace 5, non-contact temperature sensor 1 and bracket 7 coaxially arrange.
Preferably, any drive mechanism in described the first drive mechanism 2, the second drive mechanism 4 and the 3rd drive mechanism 6 is rectilinear motion and the rotational motion mechanism that pneumatic system drives, or motor-driven ball-screw rectilinear motion and rotational motion mechanism.
Preferably, described crucible 3 is stainless steel crucible or graphite crucible, but is not limited to this.
Each parts of system of the present invention are fixed in frame.
The present invention also provides a kind of method of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte, said method comprising the steps of:
1) when system is started working, during a measuring unit job, aluminium electrolyte sample is placed in crucible 3, crucible 3 is placed on material loading swing arm 9 stations, pass through motion control subsystem, press after " startup " button, material loading swing arm 9 is rotated by " material level in wait " by the 3rd drive mechanism 6 or is moved to " upper material level ", bracket 7 is held crucible 3 after rising to " feeding position " by the second drive mechanism 4, " material level in wait " got back in material loading swing arm 9, next the first drive mechanism 2 is together sent to bracket 7 and crucible 3 " the measuring position " in the cavity 10 of heating furnace 5, " measure position " thus can finely tune by height adjuster 8 bracket 7, the O-ring seal 12 of bracket 7 bottoms seals cavity 10 to form sealing,
2) crucible 3 enters after heating furnace 5, heating furnace 5 is controlled and is started to heat up by temperature control subsystem 14, electrolyte sample is heated to electrolyte melt temperature, constant temperature, then with 5-10 ℃/min, at the uniform velocity cool to standby temperature, at electrolyte, reach melt temperature and cool in standby temperature course, the variation of non-contact temperature sensor 1 monitoring electrolyte temperature, and set up temperature-time curve by data acquisition process subsystem, data acquisition process subsystem is identification and Detection curve flex point automatically, and knee point place temperature is liquidus temperature of aluminium electrolyte;
3) after one-shot measurement completes, bracket 7 is sent to crucible 3 to unload material level, and material loading swing arm 9 realizes the automatic discharging of crucible 3, and furnace temperature maintains standby temperature, prepares to measure next time;
4) when a plurality of measuring units are worked, by the logic control instruction of motion control subsystem, when a measuring unit completes primary crystal temperature measurement, interior crucible 3 electrolyte of another measuring unit just in time melting complete, non-contact temperature sensor 1 is sent to this another measuring unit automatically to start to measure, other measuring unit the like, thereby realize uninterruptedly going on continuously of surveying work.
Preferably, the method that the temperature-rise period step 2) adopts PID to control heating-up temperature realizes.
Preferably, described electrolyte is selected the aluminium electrolyte of CR=2.72, and described electrolyte melt temperature is 980 ℃, and described standby temperature is 880 ℃, and described liquidus temperature is 954.7 ℃.
The present invention is applicable to the liquidus temperature of aluminium electrolyte of various compositions and measures, and is also applicable to the measurement of other the electrolytical liquidus temperatures except aluminium electrolyte.The present invention adopts non-contact temperature sensor, and highly sensitive, anti-interference, to realize real-time change temperature ms level response measurement, has reduced the delay error of thermocouple measurement in transformation temperature, the wasteness of simultaneously having avoided thermopair to change as consumptive material.
Of the present inventionly according to given pace, at the uniform velocity reduce temperature, make decrease temperature crystalline process temperature whole process controlled, avoid too fast cooling to cause the generation of electrolytical segregation and supercooling phenomenon.Whole measuring process all automatically realizes, and misoperation and the potential safety hazard avoiding personnel to operate bringing, improve and measure efficiency.After one-shot measurement completes, can carry out fast double measurement, save time.
It is accurate that system of the present invention has measurement result, simple in structure, Repeatability and Reproducibility is stable, convenient operation, thereby effectively guarantee the even running of Aluminium Electrolysis, bring into play to greatest extent its electric energy efficiency, finally reach management level and the technical progress of further promotion Aluminium Electrolysis, and can, for improving aluminium electroloysis efficiency, improve aluminum electrolysis process significant.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of system of the present invention;
Fig. 2 is the structural representation of measuring unit in system of the present invention;
Fig. 3 is the working state schematic representation of measuring unit in system of the present invention;
Fig. 4 is the temperature-time curve of embodiment 2;
Reference numeral: 1, non-contact temperature sensor; 2, the first drive mechanism; 3, crucible; 4, the second drive mechanism; 5, heating furnace; 6, the 3rd drive mechanism; 7, bracket; 8, height adjuster; 9, material loading swing arm; 10, cavity; 11, aperture; 12, O-ring seal; 13, heat-preservation liner; 14, temperature control subsystem; 15, measuring unit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to introduce further, but not as a limitation of the invention.
Embodiment 1
As shown in Figure 1, a kind of system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte, described system comprises six measuring units 15, as shown in Figures 2 and 3, the heating furnace 5 that has cavity 10 in arbitrary measuring unit 15 comprises, heating furnace 5 places, axle center, top arrange the aperture 11 communicating with cavity 10, heating furnace 5 belows arrange the bracket 7 that can put into cavity 10, described bracket 7 bottoms arrange O-ring seal 12, enclosed cavity 10 while putting into cavity 10 for bracket 7, described bracket 7 is arranged on height adjuster 8, described height adjuster 8 carries out height by the first drive mechanism 2 being connected and the second drive mechanism 4 coordinated drive and regulates and rotate,
Described arbitrary measuring unit also comprises the 3rd drive mechanism 6, and described the 3rd drive mechanism 6 drives material loading swing arm 9, and the crucible 3 that is placed on material loading swing arm 9 tache motorices is placed on bracket 7, thereby make crucible enter cavity 10, heats;
Described system also comprises two non-contact temperature sensors 1, and described non-contact temperature sensor 1 is arranged on aperture 11 tops, for measuring the temperature of crucible 3 aluminium electrolyte samples;
Described system also comprises temperature control subsystem 14, motion control subsystem and data acquisition process subsystem, temperature in described temperature control subsystem controls cavity 10, described motion control subsystem is for controlling the transmission of drive mechanism and the movement of non-contact temperature sensor 1, and described data acquisition subsystem is for electrolyte temperature data acquisition and processing (DAP).
Described non-contact temperature sensor 1 is infrared temperature instrument.
In described cavity 10, be provided with heat-preservation liner 13.
Described heating furnace 5, non-contact temperature sensor 1 and bracket 7 coaxially arrange.
Any drive mechanism in described the first drive mechanism 2, the second drive mechanism 4 and the 3rd drive mechanism 6 is rectilinear motion or the rotational motion mechanism that pneumatic system drives.
Described crucible 3 is stainless steel crucible or graphite crucible.
In the present embodiment, gear train is connected the instruction campaign according to control module with motion control subsystem; Each described measuring unit and temperature control subsystem, motion control subsystem, the collaborative work of data acquisition process subsystem form a set of holonomic system.
Each measuring unit of the present invention is fixed on support.
A method for full-automatic continuity non-contact measurement electrolyte primary crystal temperature, said method comprising the steps of:
1) when system is started working, during a measuring unit job, the aluminium electrolyte sample of CR=2.72 is placed in crucible 3, crucible 3 is placed on material loading swing arm 9 stations, pass through motion control subsystem, press after " startup " button, material loading swing arm 9 is rotated by " material level in wait " by the 3rd drive mechanism 6 or is moved to " upper material level ", bracket 7 is held crucible 3 after rising to " feeding position " by the second drive mechanism 4, " material level in wait " got back in material loading swing arm 9, next the first drive mechanism 2 is together sent to bracket 7 and crucible 3 " the measuring position " in the cavity 10 of heating furnace 5, " measure position " thus can finely tune by height adjuster 8 bracket 7, the O-ring seal 12 of bracket 7 bottoms seals cavity 10 to form sealing,
2) crucible 3 enters after heating furnace 5, heating furnace 5 is controlled and is heated up by PID, electrolyte sample is heated to 980 ℃, constant temperature, then with 5-10 ℃/min, at the uniform velocity cool to 880 ℃, at electrolyte, reach 980 ℃ and cool in 880 ℃ of processes, the variation of infrared temperature instrument monitoring electrolyte temperature, and set up temperature-time curve by data acquisition process subsystem, as shown in Figure 4, data acquisition process subsystem is identification and Detection curve flex point automatically, knee point place temperature is electrolyte primary crystal temperature, by curve, show that electrolytical electrolysis temperature is 972.6 ℃, liquidus temperature is 954.64 ℃,
3) after one-shot measurement completes, bracket 7 is sent to crucible 3 to unload material level, and material loading swing arm 9 realizes the automatic discharging of crucible 3, and furnace temperature maintains 880 ℃, prepares to measure next time;
4) when a plurality of measuring units are worked, by the logic control instruction of motion control subsystem, when a measuring unit completes primary crystal temperature measurement, interior crucible 3 electrolyte of another measuring unit just in time melting complete, infrared temperature instrument is sent to this another measuring unit automatically to start to measure, other measuring unit the like, thereby realize uninterruptedly going on continuously of surveying work.
Measuring error≤1% of the infrared temperature instrument adopting in the embodiment of the present invention.
The result that simultaneously adopts differential thermal analysis to obtain, liquidus temperature is 955.3 ℃.
The result that simultaneously adopts traditional thermocouple temperature measurement cooling curve method to record, liquidus temperature is 954.0 ℃.
The result that measurement result and other experimental techniques obtain is approximate, and measuring error is in the error range of non-contact temperature sensor.
Embodiment 3
Adopt the system of embodiment 1 and the method for embodiment 2, choose different samples, adopt single-measurement unit to measure, electrolyte sample is comprised of sodium fluoride, aluminum fluoride, calcium fluoride and aluminium oxide, calcium fluoride accounts for 5% of electrolyte general assembly (TW), aluminium oxide accounts for electrolytical general assembly (TW) 5%, and all the other are sodium fluoride and aluminum fluoride (molecular proportion is 2.4:1), and sample weighting amount is 20g.
Recording electrolyte primary crystal temperature is 951.4 ℃, and the result that simultaneously adopts thermocouple temperature measurement cooling curve method to obtain is 950.6 ℃.
The result that measurement result and traditional experiment technology obtain is approximate, and measuring error is in the error range of non-contact temperature sensor.
Embodiment 4
Adopt the system of embodiment 1 and the method for embodiment 2, choose at random aluminium electrolyte sample, difference is: measure altogether 6 times, and be to measure, the electrolyte quality taking is different at every turn, be respectively 10g totally 2 times in a measuring unit, 20g totally 2 times, 30g totally 2 times.Record electrolyte primary crystal temperature results as shown in table 1:
The measurement result of the same measuring unit same sample of table 1 Different Weight
The repeatability of systematic survey data of the present invention is fine as can be seen from Table 1, and that traditional thermocouple measurement is subject to the impact of personnel's mode of operation is very large, inserts the electrolytical degree of depth etc. such as thermocouple probe is each.
Adopt the system of embodiment 1 and the method for embodiment 2, choose at random aluminium electrolyte sample, difference is: in each measuring unit, measure, take identical electrolyte 10g simultaneously.Record electrolyte primary crystal temperature results as shown in table 2:
The measurement result of table 2 different measuring unit same sample identical weight
Measurement data result of the present invention has the consistance of height as can be seen from Table 2, has illustrated that this system and method repeatability is very reliable.
Claims (10)
1. the system of a full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte, it is characterized in that, described system comprises several measuring units, the heating furnace (5) that has cavity (10) in arbitrary measuring unit comprises, place, heating furnace (5) axle center, top arranges the aperture (11) communicating with cavity (10), heating furnace (5) below arranges the bracket (7) that can put into cavity (10), described bracket (7) bottom arranges O-ring seal (12), enclosed cavity (10) while putting into cavity (10) for bracket (7), described bracket (7) is arranged on height adjuster (8), described height adjuster (8) carries out height by the first drive mechanism (2) being connected and the second drive mechanism (4) coordinated drive and regulates and rotate,
Described arbitrary measuring unit also comprises the 3rd drive mechanism (6), described the 3rd drive mechanism (6) drives material loading swing arm (9), the crucible (3) that is placed on material loading swing arm (9) tache motorice is placed on to bracket (7) upper, thereby make crucible enter cavity (10), heats;
Described system also comprises at least one non-contact temperature sensor (1), and described non-contact temperature sensor (1) is arranged on aperture (11) top, for measuring the temperature of crucible (3) aluminium electrolyte sample;
Described system also comprises temperature control subsystem (14), motion control subsystem and data acquisition process subsystem, temperature in described temperature control subsystem controls cavity (10), described motion control subsystem is for controlling the transmission of drive mechanism and the movement of non-contact temperature sensor (1), and described data acquisition subsystem is for electrolyte temperature data acquisition and processing (DAP).
2. the system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte according to claim 1, is characterized in that, the number of described measuring unit is six, and the number of described non-contact temperature sensor (1) is two.
3. the system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte according to claim 1, is characterized in that, described non-contact temperature sensor (1) is infrared temperature instrument.
4. the system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte according to claim 1, is characterized in that, is provided with heat-preservation liner (13) in described cavity (10).
5. the system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte according to claim 1, is characterized in that, described heating furnace (5), non-contact temperature sensor (1) and bracket (7) coaxially arrange.
6. the system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte according to claim 1, it is characterized in that, any drive mechanism in described the first drive mechanism (2), the second drive mechanism (4) and the 3rd drive mechanism (6) is rectilinear motion and the rotational motion mechanism that pneumatic system drives, or motor-driven ball-screw rectilinear motion and rotational motion mechanism.
7. the system of full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte according to claim 1, is characterized in that, described crucible (3) is stainless steel crucible or graphite crucible.
8. a method for full-automatic continuity non-contact measurement liquidus temperature of aluminium electrolyte, said method comprising the steps of:
1) when system is started working, during a measuring unit job, aluminium electrolyte sample is placed in crucible (3), crucible (3) is placed on material loading swing arm (9) station, pass through motion control subsystem, press after " startup " button, material loading swing arm (9) is rotated by " material level in wait " by the 3rd drive mechanism (6) or is moved to " upper material level ", bracket (7) is held crucible (3) after rising to " feeding position " by the second drive mechanism (4), " material level in wait " got back in material loading swing arm (9), next the first drive mechanism (2) is together sent to bracket (7) and crucible (3) interior " measuring position " of cavity (10) of heating furnace (5), " measure position " can be by height adjuster (8) bracket (7) thereby finely tuned, the O-ring seal (12) of bracket (7) bottom seals cavity (10) to form sealing,
2) crucible (3) enters after heating furnace (5), heating furnace (5) is controlled and is started to heat up by temperature control subsystem (14), aluminium electrolyte sample is heated to electrolyte melt temperature, constant temperature, then with 5-10 ℃/min, at the uniform velocity cool to standby temperature, at electrolyte, reach melt temperature and cool in standby temperature course, the variation of non-contact temperature sensor (1) monitoring electrolyte temperature, and set up temperature-time curve by data acquisition process subsystem, data acquisition process subsystem is identification and Detection curve flex point automatically, knee point place temperature is liquidus temperature of aluminium electrolyte,
3) after one-shot measurement completes, bracket (7) is sent to crucible (3) to unload material level, and material loading swing arm (9) realizes the automatic discharging of crucible (3), and furnace temperature maintains standby temperature, prepares to measure next time;
4) when a plurality of measuring units are worked, by the logic control instruction of motion control subsystem, when a measuring unit completes primary crystal temperature measurement, interior crucible (3) electrolyte of another measuring unit just in time melting completes, non-contact temperature sensor (1) is sent to this another measuring unit automatically to start to measure, other measuring unit the like, thereby realize uninterruptedly going on continuously of surveying work.
9. method according to claim 8, is characterized in that step 2) in the temperature-rise period method that adopts PID to control heating-up temperature realize.
10. method according to claim 8, is characterized in that, described electrolyte is selected the aluminium electrolyte of CR=2.72, and described aluminium electrolyte melt temperature is 980 ℃, and described standby temperature is 880 ℃, and described liquidus temperature is 954.7 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371428A (en) * | 2018-12-19 | 2019-02-22 | 东北大学 | A kind of device and method of automatic the detection aluminium electrolyte degree of superheat and electrolysis temperature |
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| JPH02296121A (en) * | 1989-05-10 | 1990-12-06 | Nippon Steel Corp | Surface-temperature measuring of object in heating furnace |
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| CN109371428B (en) * | 2018-12-19 | 2024-04-26 | 东北大学 | Device and method for automatically detecting superheat degree and electrolysis temperature of aluminum electrolyte |
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