CN104831317B - Method for judging abnormal anode current of aluminum electrolysis cell - Google Patents
Method for judging abnormal anode current of aluminum electrolysis cell Download PDFInfo
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- CN104831317B CN104831317B CN201510228137.7A CN201510228137A CN104831317B CN 104831317 B CN104831317 B CN 104831317B CN 201510228137 A CN201510228137 A CN 201510228137A CN 104831317 B CN104831317 B CN 104831317B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title abstract description 7
- 230000002159 abnormal effect Effects 0.000 title abstract description 5
- 238000005868 electrolysis reaction Methods 0.000 title description 5
- 230000005856 abnormality Effects 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 claims description 7
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000000205 computational method Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/20—Automatic control or regulation of cells
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention discloses a method for judging the abnormality of anode current of an aluminum electrolytic cell, which comprises the following steps: (1) the average is calculated according to the following equations (1) and (2)Uniform currentAnd standard deviation of，，(ii) a Where n is the number of anode groups, Ii denotes the current magnitude of the ith anode group, i =1,2, …, n; (2) calculating the difference between the current value of each anode group and the average value one by one and taking the absolute value:comparative expression
Description
Technical field
The invention belongs to aluminum electrolysis technology field, more particularly to a kind of side for judging that aluminium electrolysis anode CURRENT DISTRIBUTION is abnormal
Method.
Background technology
During aluminum electrolysis, the inhomogeneities of Current distribution in anode can influence the stability of aluminium cell, in addition, electric
The various failures and the unstable of groove condition for solving groove can also cause the inhomogeneities i.e. abnormal distribution of Current distribution in anode.Therefore, survey
Amount Current distribution in anode is the effective ways for diagnosing electrolytic bath condition.
For a long time, people calculate the size and distribution situation of anode current using equidistant discharging method rough estimate always, due to
Gained current deviation is big, and its result is for reference only in process of production.As fiber-optic current sensor technology is successfully applied to
The measurement of Current distribution in anode, the accurate Current distribution in anode data of acquisition is correctly judge that groove condition provides support, effectively
CURRENT DISTRIBUTION abnormality judgment method is significant.
The content of the invention
The purpose of the present invention be the problem of presence for prior art there is provided one kind judge that aluminium electrolysis anode CURRENT DISTRIBUTION is different
Normal method.
Above-mentioned purpose is realized by following proposal：
A kind of aluminum cell anodic current abnormality judgment method, it is characterised in that methods described includes：
（1）By below equation（1）、（2）Calculate average currentAnd standard deviation,
（1）
（2）
In formula, n is the quantity of anode unit,I i Represent the size of current of i-th of anode unit, i=1,2 ..., n；
（2）The difference of each anode unit current value and average value is calculated one by one and is taken absolute value：, comparison expressionWhether set up；If set up, the current anomaly of the anode unit；Conversely, then the anode unit current situation is normal.
According to above-mentioned method, it is characterised in thatI i Measurement use fibre optic current sensor or equidistant pressure decline method.
According to above-mentioned method, it is characterised in that when electrolytic cell uses double anode, an anode unit, which refers to, is connected to one
Two pieces of anodes on anode rod；When use but anode, then an anode unit is with regard to only one piece of anode.
According to above-mentioned method, it is characterised in that the step（2）Judgement use graph mode, i.e., compiled with anode unit
Number it is abscissa, current value is ordinate, draws electric current-anode numbering line chart or scatter diagram or column diagram, is marked in figure
Electric current averageLine,Line, when current data point fallsWhen outside region, show the anode unit current anomaly.
According to above-mentioned method, it is characterised in that equation（1）、（2）The middle electric current usedI i It is to consider anode conducting
Normalized current after capacity variation, or the actual current of conductive capability change is not considered；When not considering anode conducting capacity variation
When, for new replacing and the anode of incomplete beam conduction, the anode is ignored when being judged.
According to above-mentioned method, it is characterised in that the normalized current for pairi=I/I s , wherein,IIt is the anode measured
Actual current value, reference currentI s Computational methods be：The electric current of every anode on electrolytic cell is measured, by what is measured
The working time opening relationships of electric current and anode, anode current-working time regression model is obtained using least square fitting,
The current value calculated by the use of anode current-working time regression model is used as reference currentI s 。
Beneficial effects of the present invention：The method of the present invention can be carried out fast and accurately extremely to aluminum cell anodic current
Judge.
Embodiment
The aluminum cell anodic current abnormality judgment method of the present invention, it includes：
（1）By below equation（1）、（2）Calculate average currentAnd standard deviation,
（1）
（2）
In formula, n is the quantity of anode unit,I i Represent the size of current of i-th of anode unit, i=1,2 ..., n；
（2）The difference of each anode unit current value and average value is calculated one by one and is taken absolute value：, comparison expressionWhether set up；If set up, the current anomaly of the anode unit；Conversely, then the anode unit current situation is normal.
It is foregoingI i Measurement can use fibre optic current sensor or equidistant pressure decline method.When electrolytic cell uses double anode
When, an anode unit refers to two pieces of anodes being connected on an anode rod；When use but anode, then an anode unit is with regard to only one
Block anode.
For the ease of operation, step（2）Judgement can use graph mode, i.e., using anode group # as abscissa, electric current
It is worth for ordinate, draws electric current-anode numbering line chart or scatter diagram or column diagram, electric current average is marked in figureLine,Line, when current data point fallsWhen outside region, show the anode unit current anomaly.
Equation（1）、（2）The middle electric current usedI i It is to consider the normalized current after anode conducting capacity variation, or not
Consider the actual current of conductive capability change, wherein normalized current is actual current value divided by by leading of determining of anode working time
Electric energy power（That is anode reference current）Obtained value；When not considering anode conducting capacity variation, changed and incomplete for new
The anode of beam conduction, the anode is ignored when being judged.
The calculation procedure of normalized current is as follows：
1. reference-calibrating electric current~time model.（1）The good electrolytic cell of groove condition is selected in a series more than 5,
Record every anode change time；（2）Measure the electric current of every anode on every electrolytic cell one by one with fibre optic current sensor, together
When calculate working time of respective anode；（3）The model of anode current-working time is set up using least square method, as
Reference current~time model of serial electrolytic cell, i.e.,I s ~tModel.
2. the calculating of normalized current.（1）The size of current I of target anode electrolytic cell is measured using fibre optic current sensor；
（2）Utilized according to the working time of anodeI s ~tModel calculates reference currentI s ；（3）Utilize measured current value divided by benchmark electricity
Stream, obtains the normalized current of target anodei, i.e.,i=I/I s 。
Embodiment 1
The present embodiment carries out anode unit current anomaly judgement using numerical operation.（1）Utilize fibre optic current sensor（Or its
He includes the methods such as equidistant pressure drop）Measurement obtains Current distribution in anode dataBy equation（1）、（2）Formula is calculated
Average currentAnd standard deviation；（2）The difference of each anode unit current value and average value is calculated one by one and is taken absolute value：；（3）
If, then the current anomaly of the anode unit, if, then the electric current of the anode unit is without exception.
Embodiment 2
The present embodiment judges that anode unit and groove condition are abnormal using diagram method.（1）Using anode group # as abscissa, current value
For ordinate, anode numbering-current value line chart is set up；（2）Equation is marked out on chart（1）、（2）Calculate average（
）, anode current warning controlling value（）, and identified in the graph as reference line；（3）Observation current data point exists
Distribution in chart, the value measured when certain anode unit is outside anode current warning control line region, then the anode unit current anomaly.
Claims (3)
1. a kind of aluminum cell anodic current abnormality judgment method, it is characterised in that methods described includes step：
(1) average current is calculated by below equation (1), (2)With standard deviation S,
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In formula, n is the quantity of anode unit, IiRepresent the size of current of i-th of anode unit, i=1,2 ..., n；
(2) difference of each anode unit current value and average value is calculated one by one and is taken absolute value：Comparison expressionWhether set up；If set up, the current anomaly of the anode unit；Conversely, then the anode unit current situation is being just
Often；
IiMeasurement use fibre optic current sensor；
The electric current I used in equation (1), (2)iIt is to consider the normalized current after anode conducting capacity variation；
The normalized current is i=I/Is, wherein, I is the anode actual current value measured, reference current IsComputational methods be：
The electric current of every anode on electrolytic cell is measured, the working time opening relationships of the electric current measured and anode is utilized
Least square fitting obtains anode current-working time regression model, is calculated using anode current-working time regression model
Current value out is used as reference current Is；
The calculation procedure of the normalized current is as follows：
Set up reference-calibrating electric current~time model：1. the good electrolytic cell of groove condition is selected in a series more than 5, record
Every anode change time；2. measure the electric current of every anode on every electrolytic cell one by one with fibre optic current sensor, count simultaneously
Calculate the working time of respective anode；3. the model of anode current-working time is set up using least square method, serial electricity is used as
Solve reference current~time model of groove, i.e. Is~t models；
Calculate normalized current：1. the size of current I of target anode electrolytic cell is measured using fibre optic current sensor；2. according to anode
Working time utilize Is~t models calculate reference current Is；3. measured current value divided by reference current are utilized, target is obtained
The normalized current i of anode, i.e. i=I/Is。
2. according to the method described in claim 1, it is characterised in that when electrolytic cell uses double anode, an anode unit refers to company
It is connected on two pieces of anodes on an anode rod；When using single anode, then an anode unit is with regard to only one piece of anode.
3. according to the method described in claim 1, it is characterised in that the judgement of the step (2) uses graph mode, i.e., with sun
Pole group # is abscissa, and current value is ordinate, draws electric current-anode numbering line chart or scatter diagram or column diagram, in figure
In mark electric current averageLine,Line, when current data point falls outside region, shows the anode unit current anomaly.
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| CN108286060A (en) * | 2018-01-30 | 2018-07-17 | 北方工业大学 | Cathode current abnormity detection method and system |
| CN109457276B (en) * | 2019-01-22 | 2019-11-05 | 北方工业大学 | Electrode short circuit detection method and system |
| CN112162138A (en) * | 2020-08-27 | 2021-01-01 | 中铝郑州有色金属研究院有限公司 | Device and method for measuring balanced anode current distribution |
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| CN101220489A (en) * | 2007-10-12 | 2008-07-16 | 北京华深中色科技发展有限公司 | On-line testing method for aluminum cell anodic current distribution and monitoring device |
| CN101967658B (en) * | 2010-11-18 | 2012-08-15 | 北方工业大学 | Aluminum cell anode effect prediction device |
| CN101967659A (en) * | 2010-11-18 | 2011-02-09 | 北方工业大学 | Online monitoring system for current distribution of aluminum electrolysis cell |
| CN102758219B (en) * | 2011-04-29 | 2015-01-21 | 沈阳铝镁设计研究院有限公司 | Method for forecasting anode effects by isometric voltage drop of anode rods |
| CN203080085U (en) * | 2013-02-27 | 2013-07-24 | 云南铝业股份有限公司 | Online measurement and data analysis device for anode current distribution of aluminum electrolysis cell |
| CN103616651B (en) * | 2013-04-01 | 2016-04-13 | 湖北迅迪科技有限公司 | A kind of fibre optic current sensor on-site calibration device and using method thereof |
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