CN103088369B - On-line measurement method of bus current of aluminium electrolysis cell - Google Patents
On-line measurement method of bus current of aluminium electrolysis cell Download PDFInfo
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- CN103088369B CN103088369B CN201310060653.4A CN201310060653A CN103088369B CN 103088369 B CN103088369 B CN 103088369B CN 201310060653 A CN201310060653 A CN 201310060653A CN 103088369 B CN103088369 B CN 103088369B
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Abstract
The invention discloses an on-line measurement method of a bus current of an aluminium electrolysis cell. The on-line measurement method comprises the steps of: acquiring voltage signals of multiple buses simultaneously by utilizing a PLC (Programmable Logic Controller) system; measuring current values by virtue of an instrument for measuring the instantaneous currents of the buses according to the invariant resistance of each single bus; calculating resistance values by the ohm law; and then converting each voltage signal to the real-time current value of each bus. The method is applicable to the on-line measurement on the bus current of any cell-type single electrolysis cell. The method can be used for monitoring the current values of input buses and output buses of a cathode pole and an anode pole of one electrolysis cell at the same time point on line, or establishing a database for the current values of the input buses and the output buses of the cathode pole and the anode pole of one electrolysis cell at the same time point of each period, analyzing the running condition and the trend of the electrolysis cell and guiding electrolysis production.
Description
Technical field
The present invention relates to technical field of aluminum electrolysis, specifically a kind of aluminum cell bus-bar electric current On-line Measuring Method.
Background technology
Along with deepening continuously of process of industrialization, situation of production is more and more severeer, and production efficiency and production continous-stable require more and more higher.In Aluminium Electrolysis, electrolyzer breakage is the major cause that bakie accident occurs, and is also potential safety hazard maximum in Aluminum Electrolysis Production process.The breakage of current judgement electrolyzer according to mainly the method such as seeking by rule of thumb by aluminium liquid quality, pot shell, square steel head temperature or artificial hammer drill in electrolyzer, these method promptnesses are relatively slow, are generally to be just found afterwards; Electrolyzer stably manufactured is the target that Aluminium Electrolysis is pursued always.Such as the 186KA electrolyzer self-forming burner hearth of Kweiyang magnalium designing institute design starts, B face current output terminal is general more empty, cathodic current is bigger than normal, the electric current that every root negative electrode soft ribbons bus passes through is too large, and about 4500-6000 Amps, because measuring method is limited, indefinite reliable accurate data Instructing manufacture continuously, burner hearth controls to carry out with feeling by rule of thumb, and control effects varies with each individual, very undesirable.
Summary of the invention
The object of this invention is to provide a kind of aluminum cell bus-bar electric current On-line Measuring Method, separate unit electrolyzer early damage position can be gone out by Accurate Diagnosis, prevent electrolyzer bakie accident from occurring; Electrolyzer running condition and trend analysis and guidance can be provided, and on-line monitoring.
The electric current that aluminum cell bus-bar passes through is quite large and be direct current, general all more than a few kiloampere, it is larger that direct-on-line measures electric current difficulty, and the magnitude of voltage of point-to-point transmission (50cm) is relatively little on bus, only have several millivolts to tens millivolts, be convenient to measure, the present invention utilizes PLC control system to gather many bus voltage signals simultaneously, constant according to single bus bar resistance, current value is measured by the instrument measuring bus momentary current, calculate resistance by Ohm's law, voltage signal is converted into the method for each bus real-time current value.The method is applicable to the on-line measurement of the separate unit electrolyzer bus electric current of any grooved.
Concrete steps are as follows:
1) the real-time criteria signal of 0-10V is gathered by SQ-3 direct current millivolt input isolating transmitter;
2) utilize current measuring instrument to measure bus instantaneous current value, measuring position is selected in 2 points on surveyed current bus bar, and this bus of 2 does not cross, and the distance of this point-to-point transmission is 30-50cm;
3) current value measured is inputted PLC as calibration current value, start on-line monitoring and data gathering that sequence of control can realize the soft master tape outward current of whole negative electrode.
Method of the present invention has following positively effect compared with the prior art:
One, can apply on various different grooved aluminium cell, only need increase Controlling System input point;
Two, can on-line monitoring separate unit anode electrolytic cell and negative electrode input and output bus synchronization current value or set up the input and output bus synchronization current value database of each anode of separate unit electrolyzer day part and negative electrode, analyze electrolyzer running condition and trend, instruct electrolysis production;
Three, can accurately predict by measuring the soft master tape outward current of electric tank cathode or judge electrolyzer damage location;
Four, reference can be provided for later aluminum cell bus-bar design and electrolyzer control program.
Accompanying drawing explanation
Fig. 1 is aluminum cell bus-bar electric current On-line Measuring Method schema of the present invention.
Fig. 2 is that three aluminium electrolytic cell cathode bus currents move towards distribution plan.
Embodiment
Aluminum cell bus-bar electric current On-line Measuring Method concrete steps are as follows: (as shown in Figure 1)
1) the real-time criteria signal of 0-10V is gathered by SQ-3 direct current millivolt input isolating transmitter;
2) utilize current measuring instrument to measure bus instantaneous current value, measuring position is selected in 2 points on surveyed current bus bar, and this bus of 2 does not cross, and the distance of this point-to-point transmission is 30-50cm;
3) current value measured is inputted PLC as calibration current value, start on-line monitoring and data gathering that sequence of control can realize the soft master tape outward current of whole negative electrode.
Selected point and signal wire bolt presses, signal wire adopts the shielding wire of 2*2.5mm.
186KA electrolyzer such as shown in Fig. 2 measures the on-line measurement of each negative electrode soft master tape electric current:
Wherein an electrolyzer has 36 soft master tapes, be distributed in each 18 of electrolyzer A, B two sides, be designated as A1-A18, B1-B18, on A1,2 points are chosen during measurement, distance is about 30cm, uses bolt presses two shielding wires respectively, shielding wire is guided to SQ-3 direct current millivolt isolating transmitter input terminus in housing.The wiring of 35 soft master tapes of other A2-A18, B1-B18 is completed by the identical mode of connection.PLC control system is powered on, the soft master tape being enclosed within A1-A18, B1-B18 with current measuring instrument one by one measures corresponding current value, using the current value input control system program of correspondence as calibration current value, start the collection that PLC control program can realize 36 negative electrode soft master tape outward current on-line monitorings and data.
Claims (2)
1. an aluminum cell bus-bar electric current On-line Measuring Method, is characterized in that carrying out according to the following steps:
1) the real-time criteria signal of 0-10V is gathered by SQ-3 direct current millivolt input isolating transmitter;
2) utilize current measuring instrument to measure bus instantaneous current value, measuring position is selected in 2 points on surveyed current bus bar, and this bus of 2 does not cross, and the distance of this point-to-point transmission is 30-50cm;
3) current value measured is inputted PLC as calibration current value, start on-line monitoring and data gathering that sequence of control can realize the soft master tape outward current of whole negative electrode.
2. the aluminum cell bus-bar electric current On-line Measuring Method according to right 1, is characterized in that selected point and signal wire bolt presses, and signal wire adopts the shielding wire of 2*2.5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310060653.4A CN103088369B (en) | 2013-02-27 | 2013-02-27 | On-line measurement method of bus current of aluminium electrolysis cell |
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| CN201310060653.4A CN103088369B (en) | 2013-02-27 | 2013-02-27 | On-line measurement method of bus current of aluminium electrolysis cell |
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| CN103088369A CN103088369A (en) | 2013-05-08 |
| CN103088369B true CN103088369B (en) | 2015-06-10 |
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| CN104278295B (en) * | 2013-07-04 | 2018-08-28 | 贵阳铝镁设计研究院有限公司 | A kind of aluminum cell anodic current distribution measurement system and its measurement method |
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| CH576530A5 (en) * | 1972-07-18 | 1976-06-15 | Alusuisse |
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| CN1363728A (en) * | 2001-01-12 | 2002-08-14 | 贵州铝厂 | Method and device for automatically measuring distribution of anode current in Al electrolyzer |
| CN201241186Y (en) * | 2008-08-11 | 2009-05-20 | 北方工业大学 | Electrolytic tank anode bus current distribution measuring instrument |
| CN202401144U (en) * | 2011-12-08 | 2012-08-29 | 湖南中大业翔科技有限公司 | Full-automatic auto-adaptation current distribution tester for aluminum electrolytic cell anode |
| CN102409361A (en) * | 2011-12-26 | 2012-04-11 | 贵阳铝镁设计研究院有限公司 | Thermoelectric online monitoring system of aluminum electrolysis cell bus |
| CN102424985A (en) * | 2011-12-26 | 2012-04-25 | 贵阳铝镁设计研究院有限公司 | Real-time measurement device for temperature and current of through-flow bus of aluminum electrolysis cell |
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Effective date of registration: 20190430 Address after: 657099 No. 16 Aimin Road, Zhaoyang District, Zhaotong City, Yunnan Province Patentee after: Yunnan Yunnan Aluminum Haixin Aluminum Industry Co., Ltd. Address before: 650000 Yunnan, Yunnan Kunming Chenggong Yunnan aluminum Limited by Share Ltd Patentee before: Yunnan Aluminium Co., Ltd. |
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