CN103014773A - Device and method for balancing alumina concentration of aluminium electrolysis tank - Google Patents
Device and method for balancing alumina concentration of aluminium electrolysis tank Download PDFInfo
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- CN103014773A CN103014773A CN2012104837891A CN201210483789A CN103014773A CN 103014773 A CN103014773 A CN 103014773A CN 2012104837891 A CN2012104837891 A CN 2012104837891A CN 201210483789 A CN201210483789 A CN 201210483789A CN 103014773 A CN103014773 A CN 103014773A
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Abstract
The invention discloses a device and a method for balancing the alumina concentration of an aluminium electrolysis tank, wherein an anodic current density monitoring module M1 monitors anodic current density in real time and reports monitored anodic current density data to a CPU (Central Processing Unit) of an electrolysis tank control system; and, after receiving the anodic current density data sent by the anodic current density monitoring module M1, the CPU of the electrolysis tank control system starts an alumina concentration estimating module M2 to carry out alumina concentration estimation at positions with higher and lower anodic current densities, and increases or decreases baiting according to the estimation result till the anodic alumina concentration at the Ai position returns to the normal control range. The existing electrolytic process is unnecessary to change, so that the device and the method disclosed by the invention are easy to industrially implement; the problems of having lower alumina concentration at corner regions in the electrolysis tank or higher alumina concentration of a newly changed anodic region can be effectively avoided; anode side effects, scintillation effects and PFC (Polymerization Ferric Chloride) emission can be obviously reduced; and the device and the method disclosed by the invention are conductive to operating the electrolysis tank stably at high efficiency.
Description
Technical field
The invention belongs to the aluminum electrolysis technology field, relate in particular to a kind of device and method of balanced concentration of aluminum oxide in aluminum electrolytic bath.
Background technology
In the production metallic aluminium process that adopts Hall-Ai Lute aluminum electrolysis process, adopt carbon anode reduction-oxidation aluminium to produce metallic aluminium, normal reaction product of anode is CO
2Following problems can appear in electrolytic process: (1) because carbon anode is not that homogeneous material is made, the invariably accompany generation of side reaction of anodic reaction; (2) because carbon anode is limited work-ing life, be 26-30 days generally speaking, so need the periodic replacement carbon anode; (3) the new carbon anode of changing for various reasons, anodic current does not temporarily reach normal level, can cause the larger electric current of anode carrying around it, it is uneven to cause all anodic currents to distribute; (4) anodic current distributes inequality, will cause the difference of anodic current density, thereby causes the difference of the unbalanced and aluminum oxide consumption of anodic reaction; (5) along with the continuous increase of electrolytic cell currents capacity, the pot shell size is increasing, the distance that is installed on the alumina blanking device of the electrolyzer centre joint and electrolysis trough side part and bight is farther, aluminum oxide can not be diffused rapidly to limit section and bight, cause the alumina concentration of anode bottom inhomogeneous, aggravated the generation of anode side reaction.
When alumina concentration was in normal level in the even and groove when the current density of all anodes, the anodic gas product was 100% CO
2, anodic reaction is:
E
0=1.18V
When alumina concentration was inhomogeneous in the inhomogeneous or trough when anodic current density, the anode side reaction will occur:
E
0=1.02V
The anode side reaction not only bring fluoride salt, carbon anode unnecessary consumption, discharge perfluoro-carbon (PFC) more, also can reduce current efficiency, cause reactive energy consumption.Therefore the anode side reaction is very harmful to Aluminium Electrolysis, must be reduced by every means.
There is certain dependence between anodic current density and the alumina concentration, can be calculated by following experimental formula: i
A=[5.5+0.018 (T-1323)] A
-0.1(C
Al2O3 0.5-0.4), i in the formula
AThe expression anodic current density, A is the monolithic annode area, T is electrolysis temperature (K).According to this experimental formula, alumina concentration can be expressed as: C
Al2O3={ 0.4+i
A* A
0.1/ [5.5+0.018 (T-1323)] }
2, alumina concentration can be calculated and estimate to the electrolyzer Controlling System accordingly.
If the current density of anode is high, near the aluminum oxide consumption this piece anode is accelerated, and will cause this piece anode bottom alumina concentration on the low side, and the aluminum oxide deficiency will cause anodic reaction unusual, brings out to produce the anode side reaction.Need timely supplemental aluminium when aluminum oxide is not enough, avoid the generation of anode side reaction.Because the aluminium electrolysis anode reaction is carried out in the high-temperature fusion ionogen, the aluminum oxide in the electrolyzer consumes situation and can't observe with the naked eye; Again because the severe corrosive of electrolysis of fluorides matter does not also find the material that can directly insert long-time measurement alumina concentration in the ionogen at present.Therefore can not find in time that aluminum oxide is not enough in the groove, for timely supplemental aluminium has caused difficulty, need to solve.
Domestic and international patent documentation is retrieved, retrieved altogether the patent hundreds of bar relevant with aluminium cell, wherein relate to 10 of the patents of alumina concentration.The Patents document of retrieval is as follows:
Patent CN201210131601.7 has reported the flexible measurement method of alumina concentration in a kind of aluminium electrolysis process electrolyzer, specifically may further comprise the steps: the data gathering of (1) process manufacturing parameter; (2) process manufacturing parameter data pre-treatment; (3) process manufacturing parameter data sample is set up; (4) set up based on the polyoxy aluminum concentration soft-sensing model of different slots state and ask for model parameter; (5) application model is estimated alumina concentration.
Patent 201110372135.7 discloses a kind of method of controlling the concentration of aluminum oxide in aluminum cell stable and uniform, the method is at first, alumina concentration is controlled target be located at low-resistance concentration district, by two main control processs: " the concentration verification " of long-term " put in material by need " and short-term realizes in time feed and in the steady running in low-resistance concentration district as required of aluminium cell; The second, each anode of electrolyzer is carried out the on-line measurement of distribution of current, according to the aluminum oxide spending rate of anode around each blanking point, adjust the blanking ratio of each blanking point, realize alumina concentration even distribution spatially.The 3rd, improved blanking device and cutting mode have reduced the precipitation of alumina that produces because of the feed opening accumulation.
Patent 201110372203.X relates to a kind of method that non-anode effect PFC produces that suppresses, comprise: the variation of continuous detecting anodic current density, if the current density of certain piece or a few anodes continues to raise, when actual value surpasses at least 0.2 times of normal production value, start the alumina concentration estimator; Alumina concentration in the verification electrolyzer if when alumina concentration is lower than at least 0.1 times of prior estimate near this piece anode, start little blanking program, makes near the blanking device this piece anode carry out little blanking, and discharge quantity is no more than 0.5 times of normal discharge quantity; Electrolyte flow direction in the groove borrows the external force intervention to increase electrolyte flow rate, drives aluminum oxide fast to this piece anode place; Observe the variation of this piece anodic current density, if do not reply normal value, repeat aforesaid operations, until the current density of this piece anode is returned to normal production value.
The on-line determination device that patent 201110372146.5 discloses alumina concentration in a kind of aluminium cell comprises crucible, central electrode and outer electrode in outer crucible, the porous graphite, crucible places described outer crucible inner in the described porous graphite, and central electrode is inserted in the described interior crucible, described outer electrode is inserted in the described outer crucible, is connected with potentiometer between described central electrode and the described outer electrode.The present invention is electrode insertion respectively in the different fused electrolyte of two kinds of alumina concentrations, if two kinds of ionogen are communicated with by semi-permeable membranes, then the potential difference between two electrodes is relevant with the concentration of aluminum oxide in two kinds of ionogen, if a kind of electrolytical concentration as can be known, just can infer alumina concentration in the another kind of ionogen according to typical curve.
Patent 201110165013.0 has been reported a kind of on-line identification method of concentration signal of aluminum oxide in electrolyte in aluminum electrolysis cell, is used for the on-line identification method of the alumina concentration signal of Aluminium Electrolysis process alumina feeding amount control.It is characterized in that its on-line identification process is take pole span as actuation signal, picks out alumina concentration by the response signal of cell resistance in the pole span adjustment process.
Patent 201110166650.X relates to a kind of method of controlling concentration of aluminum oxide in aluminum electrolytic bath, relates to a kind of method of control of aluminium electrolysis process.It is characterized in that utilizing the alumina concentration in the ionogen that the soft measurement of cell control system records, with its value of feedback as the control of cell control system alumina concentration; With the switching condition of alumina concentration target value as the normal blanking of the aluminum oxide cycle; By the cell control system control alumina blanking cycle; After normal blanking periodic duty for some time, move the excessive blanking cycle, with the generation that suppresses anode effect with carry out the concentration verification, then move the amount of the owing blanking cycle, alumina concentration is carried out again verification, after again move the excessive blanking cycle, returned at last in the normal blanking cycle; By take the blanking master mode of normal blanking cycle as the master, realize the definite value control of alumina concentration.
Patent 200910306846.7 discloses a kind of control method of concentration of aluminum oxide in aluminum electrolytic bath, comprise the steps, stop blanking in the described aluminium cell, adjust the blanking interval: the ratio of excessive number of times and the amount of owing number of times is greater than 1.5 and less than 2.5 within the unit time, and blanking is spaced apart normal oxidation aluminium blanking interval; The ratio of excessive number of times and the amount of owing number of times is more than or equal to 0.5 and less than or equal to 1.5 within the unit time, and blanking is spaced apart in normal oxidation aluminium blanking interval basis increases 1-5 second; The ratio of excessive number of times and the amount of owing number of times is more than or equal to 2.5 and less than or equal to 3.0 within the unit time, and blanking is spaced apart in normal oxidation aluminium blanking interval basis and reduces 1-5 second; Then, carry out continuously bath voltage sampling, the value that deducts setting voltage when the value of bath voltage is during more than or equal to 30 millivolts, the beginning blanking.
Patent 200710303616.6 has been reported a kind of method of real-time detection of concentration of aluminum oxide in aluminum cell, relates to a kind of slot control machine that utilizes and measures in real time and the interior alumina concentration of demonstration electrolyzer, is used for the real-time control of electrolyzer alumina concentration.It is characterized in that its real-time forecasting process is to utilize cell control system to pass through to detect in real time voltage and the potline current of electrolyzer, and control alumina blanking cycle and time, according to velocity of variation, blanking interval, the time of electrolytic bath electrical resistance time, and blanking device capacity parameter, set up the relational model of electrolyzer operating parameter and alumina concentration, dope alumina concentration and the real-time alumina concentration within slot control machine shows electrolyzer in the electrolyzer.
Patent 200710049426.6 relates to a kind of Aluminium Electrolysis technology, specifically relates to a kind of aluminum cell low aluminum oxide concentration control method.The inventive method comprises the steps: 1) adjust computer system parameter step: refer to by upper computer the Controlling System parameter be adjusted, shorten the benchmark amount of the owing cycle, blanking cycle, maximum excessive time after excessive cycle of benchmark, benchmark normal cycle, blanking initialization time, effect, prolong minimum positive shift time; 2) the tuned slope, accumulative total slope, blanking speed step: refer to increase by upper computer the lower limit of the exact value domain of slope, accumulative total slope, reduce its upper limit, dwindle the exact value domain of blanking speed.
Patent 200410040160.5 discloses a kind of crust-breaking ﹠ baiting point configuration of ultra-large type prebaked cell for aluminum-reduction, it is by electrolytic cell body, pre-baked anode carbon blocks, crust-breaking ﹠ baiting point forms, and five workpiece crust-breaking ﹠ baiting points are evenly arranged in longitudinal cenlerline and the vertical break joint infall of pre-baked anode carbon blocks of cell body.Owing to adopt technique scheme, blanking point is arranged evenly, be conducive to add the even of electrolyzer alumina concentration, make the aluminum oxide that adds in the electrolyzer can not produce precipitation in cell bottom, be conducive to electrolysis production; Can choose simultaneously two wherein symmetrical blanking points as the fluoride salt blanking point, be conducive to the diffusion of fluoride salt in ionogen.
Summary of the invention
The present invention is exactly for solving the deficiencies in the prior art, provide a kind of Real-Time Monitoring anode electrolytic cell current density, accordingly assess alumina concentration, by little blanking device in time to electrolyzer supplemental aluminium or reduce the intermediate blanking device discharge quantity, avoid the electrolyzer corner areas alumina concentration to occur crossing low or newly change the apparatus and method that alumina concentration in the too high balanced electrolyzer of aluminum oxide appears in anode region.
Above-mentioned purpose realizes by following proposal:
A kind of device of balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, described device comprises:
Anodic current density monitoring modular M1, it is used for carrying out the Real-Time Monitoring of anodic current density, and the anodic current density data that monitor is reported the CPU of electrolyzer Controlling System;
Alumina concentration estimation block M2, it is used for carrying out the alumina concentration estimation;
The little blanking control module of aluminum oxide M3, it is used for carrying out the control of little blanking;
The CPU of electrolyzer Controlling System after it receives the anodic current density data of anodic current density monitoring modular M1 transmission, starts alumina concentration estimation block M2 antianode current density position higher and on the low side and carries out the alumina concentration estimation, if anode A
iPlace's alumina concentration is on the low side, and this CPU will assign little blanking instruction to the little blanking control module of aluminum oxide M3, the little blanking control module of aluminum oxide M3 antianode A
iThe place carries out little blanking operation, and the blanking situation is reported this CPU; If anode A
iPlace's alumina concentration is higher, and this CPU will control anode A
iNear intermediate blanking device reduces discharge quantity; This CPU starts alumina concentration estimation block M2 and again carries out the alumina concentration estimation, and confirms anode A
iWhether place's alumina concentration gets back to normal span of control; If anode A
iPlace's alumina concentration is still on the low side or higher, will repeat to reduce blanking operation or little blanking operation, until anode A
iPlace's alumina concentration is got back to normal span of control.
Device according to above-mentioned balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, described anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of electrolyzer Controlling System.
Device according to above-mentioned balanced concentration of aluminum oxide in aluminum electrolytic bath, it is characterized in that the function of anodic current density monitoring modular M1 Real-Time Monitoring anodic current density is finished in the following order: the equidistant pressure drop of measurement anode → calculating anodic current → calculating anodic current density → to CPU report calculation result; The little blanking control module of described aluminum oxide M3 controls the function of little blanking and finishes in the following order: receive the blanking instruction of CPU → little blanking device of startup aluminum oxide and carry out little blanking → with the blanking situation report to CPU; The alumina amount that the alumina amount that the little blanking device of aluminum oxide replenishes in the groove and intermediate blanking device reduce will be according to formula C
Al2O3={ 0.4+i
A* A
0.1/ [5.5+0.018 (T-1323)] }
2Estimate, increase or reduce blanking according to the estimation result of CPU.
Device according to above-mentioned balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, anode A
iCan be any anode in the electrolyzer, the anode numbering be followed successively by A in the direction of the clock from aluminium flowing-out mouth 3 beginnings
1, A
2, A3 ... A
N, N represents the anode number of electrolyzer.
A kind of method of balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, described method comprises:
(1) anodic current density monitoring modular M1 carries out the Real-Time Monitoring of anodic current density, and the anodic current density data that monitor is reported the CPU of electrolyzer Controlling System;
(2) after the CPU of electrolyzer Controlling System receives the anodic current density data of anodic current density monitoring modular M1 transmission, start alumina concentration estimation block M2 antianode current density position higher and on the low side and carry out the alumina concentration estimation, if anode A
iPlace's alumina concentration is on the low side, and this CPU will assign little blanking instruction to the little blanking control module of aluminum oxide M3, the little blanking control module of aluminum oxide M3 antianode A
iThe place carries out little blanking operation, and the blanking situation is reported this CPU; If anode A
iPlace's alumina concentration is higher, and this CPU will control anode A
iNear intermediate blanking device reduces discharge quantity; This CPU starts alumina concentration estimation block M2 and again carries out the alumina concentration estimation, and confirms anode A
iWhether place's alumina concentration gets back to normal span of control; If anode A
iPlace's alumina concentration is still on the low side or higher, will repeat to reduce blanking operation or little blanking operation, until anode A
iPlace's alumina concentration is got back to normal span of control.
Method according to above-mentioned balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, described anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of electrolyzer Controlling System.
Method according to above-mentioned balanced concentration of aluminum oxide in aluminum electrolytic bath, it is characterized in that the function of anodic current density monitoring modular M1 Real-Time Monitoring anodic current density is finished in the following order: the equidistant pressure drop of measurement anode → calculating anodic current → calculating anodic current density → to CPU report calculation result; The little blanking control module of described aluminum oxide M3 controls the function of little blanking and finishes in the following order: receive the blanking instruction of CPU → little blanking device of startup aluminum oxide and carry out little blanking → with the blanking situation report to CPU; The alumina amount that the alumina amount that the little blanking device of aluminum oxide replenishes in the groove and intermediate blanking device reduce will be according to formula C
Al2O3={ 0.4+i
A* A
0.1/ [5.5+0.018 (T-1323)] }
2Estimate, increase or reduce blanking according to the estimation result of CPU.
Method according to above-mentioned balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, anode A
iCan be any anode in the electrolyzer, the anode numbering begins to be followed successively by in the direction of the clock A from aluminium flowing-out mouth
1, A
2, A3 ... A
N, N represents the anode number of electrolyzer.
Beneficial effect of the present invention: apparatus and method of the present invention do not need to change existing electrolysis process, be easy to industrial implementation, effectively having avoided in the electrolyzer corner areas alumina concentration to occur crosses low or newly changes anode region alumina concentration to occur too high, can obviously reduce the anode side reaction, reduce scintillation effect generation and PFC discharging, be conducive to the efficient stable operation of electrolyzer.
Description of drawings
Fig. 1 is the apparatus structure synoptic diagram of balanced concentration of aluminum oxide in aluminum electrolytic bath of the present invention.
Embodiment
Referring to Fig. 1, the device of balanced concentration of aluminum oxide in aluminum electrolytic bath of the present invention comprises: anodic current density monitoring modular M1, it is used for the Real-Time Monitoring that antianode carries out anodic current density, signal wire 2 is connected anode 4 with module M1, and the anodic current density data that monitor is reported the CPU of electrolyzer Controlling System 1; Alumina concentration estimation block M2, it is used for carrying out the alumina concentration estimation; The little blanking control module of aluminum oxide M3, it is used for carrying out the control of little blanking; The CPU of electrolyzer Controlling System after it receives the anodic current density data of anodic current density monitoring modular M1 transmission, starts alumina concentration estimation block M2 antianode current density position higher and on the low side and carries out the alumina concentration estimation, if anode A
iPlace's alumina concentration is on the low side, and this CPU will assign little blanking instruction to the little blanking control module of aluminum oxide M3, the little blanking control module of aluminum oxide M3 antianode A
iThe place carries out little blanking operation, and the blanking situation is reported this CPU; If anode A
iPlace's alumina concentration is higher, and this CPU will control anode A
iNear intermediate blanking device 5 reduces discharge quantities; This CPU starts alumina concentration estimation block M2 and again carries out the alumina concentration estimation, and confirms anode A
iWhether place's alumina concentration gets back to normal span of control; If anode A
iPlace's alumina concentration is still on the low side or higher, will repeat to reduce blanking operation or little blanking operation, until anode A
iPlace's alumina concentration is got back to normal span of control.
The method of balanced concentration of aluminum oxide in aluminum electrolytic bath of the present invention comprises: (1) anodic current density monitoring modular M1 carries out the Real-Time Monitoring of anodic current density, and the anodic current density data that monitor is reported the CPU of electrolyzer Controlling System; (2) after the CPU of electrolyzer Controlling System receives the anodic current density data of anodic current density monitoring modular M1 transmission, start alumina concentration estimation block M2 antianode current density position higher and on the low side and carry out the alumina concentration estimation, if anode A
iPlace's alumina concentration is on the low side, and this CPU will assign little blanking instruction to the little blanking control module of aluminum oxide M3, the little blanking control module of aluminum oxide M3 antianode A
iThe place carries out little blanking operation, and the blanking situation is reported this CPU; If anode A
iPlace's alumina concentration is higher, and this CPU will control anode A
iNear intermediate blanking device 5 reduces discharge quantities; This CPU starts alumina concentration estimation block M2 and again carries out the alumina concentration estimation, and confirms anode A
iWhether place's alumina concentration gets back to normal span of control; If anode A
iPlace's alumina concentration is still on the low side or higher, will repeat to reduce blanking operation or little blanking operation, until anode A
iPlace's alumina concentration is got back to normal span of control.
The function of anodic current density monitoring modular M1 Real-Time Monitoring anodic current density is finished in the following order: the equidistant pressure drop of measurement anode → calculating anodic current → calculating anodic current density → to CPU report calculation result; The little blanking control module of described aluminum oxide M3 controls the function of little blanking and finishes in the following order: receive the blanking instruction of CPU → little blanking device 6 of startup aluminum oxide and carry out little blanking → with the blanking situation report to CPU; The alumina amount that the alumina amount that the little blanking device 6 of aluminum oxide replenishes in the groove and intermediate blanking device 5 reduce will be according to formula C
Al2O3={ 0.4+i
A* A
0.1/ [5.5+0.018 (T-1323)] }
2Estimate, increase or reduce blanking according to the estimation result of CPU.Circuit 8 among Fig. 1 is little blanking device 6 mobile alignments.
Anode A
iCan be any anode in the electrolyzer, the anode numbering be followed successively by A in the direction of the clock from aluminium flowing-out mouth 3 beginnings
1, A
2, A3 ... A
N, N represents the anode number of electrolyzer 7.
Below in conjunction with example method of the present invention is described further.
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 300KA series (20 groups of double anodes) electrolyzer Controlling System; The M1 module is carried out the operations such as the equidistant drop measurement of anode, anodic current calculating, anodic current density calculating continuously, then the anodic current density data is reported CPU; CPU antianode current density is analyzed, find that anode A 4 and A16 place current density are higher, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A4 and A16 place and estimates, if anode A 4 and A16 place alumina concentration are on the low side, CPU will assign little blanking instruction to the M3 module, the M3 module moves to anode A 4 and A16 place with little blanking device 6, the alumina amount of determining by CPU carries out little blanking operation, and the blanking situation reported CPU, CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 4 and A16 place alumina concentration get back to normal span of control; If anode A 4 and A16 place alumina concentration are still on the low side, will repeat above-mentioned steps, until anode A 4 and A16 place alumina concentration go back up to normal span of control.
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 300KA series (20 groups of double anodes) electrolyzer Controlling System; The M1 module is carried out the operations such as the equidistant drop measurement of anode, anodic current calculating, anodic current density calculating continuously, then the anodic current density data is reported CPU; CPU antianode current density is analyzed, it is on the low side to find newly to change anode A 7 place's current densities, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A7 place and estimates, if anode A 7 place's alumina concentrations are higher, CPU assigns near the intermediate blanking device 5 the anode A7 and reduces the blanking instruction, after this CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 7 place's alumina concentrations get back to normal span of control; If anode A 7 place's alumina concentrations are still higher, will repeat aforesaid operations, until anode A 7 place's alumina concentrations drop to normal span of control.
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 350KA series (48 groups of single anodes) electrolyzer Controlling System; The M1 module is carried out the equidistant drop measurement of anode continuously, anodic current calculates, the operations such as anodic current density calculating, then the anodic current density data are reported CPU, CPU antianode current density is analyzed, find anode A 21, A22 and A35 place current density are higher, CPU starts alumina concentration estimation block M2 antianode A21, the alumina concentration at A22 and A35 place is estimated, if anode A 21, A22 and A35 place alumina concentration are on the low side, CPU will assign little blanking instruction to the M3 module, the M3 module moves to anode A 21 and A35 place with little blanking device 6, the alumina amount of determining by CPU respectively carries out little blanking operation, and the blanking situation reported CPU, CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 21 and A35 place alumina concentration get back to normal span of control; If anode A 21 and A35 place alumina concentration are still on the low side, will repeat above-mentioned steps, until anode A 21 and A35 place alumina concentration go back up to normal span of control.
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 350KA series (48 groups of single anodes) electrolyzer Controlling System; The M1 module is carried out the equidistant drop measurement of anode continuously, anodic current calculates, the operations such as anodic current density calculating, then the anodic current density data are reported CPU, CPU antianode current density is analyzed, it is on the low side to find newly to change anode A 31 place's current densities, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A31 place and estimates, if anode A 31 place's alumina concentrations are higher, CPU assigns near the intermediate blanking device 5 the anode A31 and reduces the blanking instruction, after this CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 31 place's alumina concentrations get back to normal span of control; If anode A 31 place's alumina concentrations are still higher, will repeat aforesaid operations, until anode A 31 place's alumina concentrations drop to normal span of control.
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 400KA series (48 groups of single anodes) electrolyzer Controlling System; The M1 module is carried out the operations such as the equidistant drop measurement of anode, anodic current calculating, anodic current density calculating continuously, then the anodic current density data is reported CPU; CPU antianode current density is analyzed, find that anode A 9, A10, A24 and A25 place current density are higher, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A9, A10, A24 and A25 place and estimates, if anode A 9 and A25 place alumina concentration are on the low side, CPU will assign little blanking instruction to the M3 module; The M3 module moves to anode A 9 and A25 place with little blanking device 6, the alumina amount of determining by CPU carries out little blanking operation, and the blanking situation reported CPU, CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 9 and A25 place alumina concentration get back to normal span of control; If anode A 9 and A25 place alumina concentration are still on the low side, will repeat above-mentioned steps, until anode A 9 and A25 place alumina concentration go back up to normal span of control.
Embodiment 6
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 400KA series (48 groups of single anodes) electrolyzer Controlling System; The M1 module is carried out the equidistant drop measurement of anode continuously, anodic current calculates, the operations such as anodic current density calculating, then the anodic current density data are reported CPU, CPU antianode current density is analyzed, anode A 17 is newly changed in discovery and A43 place current density is on the low side, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A17 and A43 place and estimates, if anode A 43 place's alumina concentrations are higher, CPU assigns near the intermediate blanking device 5 the anode A43 and reduces the blanking instruction, after this CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 43 place's alumina concentrations get back to normal span of control; If anode A 43 place's alumina concentrations are still higher, will repeat aforesaid operations, until anode A 43 place's alumina concentrations drop to normal span of control.
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 500KA series (24 groups of double anodes) electrolyzer Controlling System; The M1 module is carried out the operations such as the equidistant drop measurement of anode, anodic current calculating, anodic current density calculating continuously, then the anodic current density data is reported CPU; CPU antianode current density is analyzed, find that anode A 5, A13, A14 and A22 place current density are higher, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A5, A13, A14 and A22 place and estimates, if anode A 5 and A22 place alumina concentration are on the low side, CPU will assign little blanking instruction to the M3 module; The M3 module moves to respectively anode A 5 and A22 place with little blanking device 6, the alumina amount of determining by CPU carries out little blanking operation, and the blanking situation reported CPU, CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 5 and A22 place alumina concentration go back up to normal span of control; If anode A 5 and A22 place alumina concentration are still on the low side, will repeat above-mentioned steps, until anode A 5 and A22 place alumina concentration go back up to normal span of control.
Embodiment 8
Anodic current density monitoring modular M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of 500KA series (24 groups of double anodes) electrolyzer Controlling System; The M1 module is carried out the equidistant drop measurement of anode continuously, anodic current calculates, the operations such as anodic current density calculating, then the anodic current density data are reported CPU, CPU antianode current density is analyzed, anode A 12 is newly changed in discovery and A19 place current density is on the low side, CPU starts the alumina concentration at alumina concentration estimation block M2 antianode A12 and A19 place and estimates, if anode A 19 place's alumina concentrations are higher, CPU assigns near the intermediate blanking device 5 the anode A19 and reduces the blanking instruction, after this CPU starts the M2 module and again carries out the alumina concentration estimation, and confirms whether anode A 19 place's alumina concentrations get back to normal span of control; If anode A 19 place's alumina concentrations are still higher, will repeat aforesaid operations, until anode A 19 place's alumina concentrations drop to normal span of control.
Claims (8)
1. the device of a balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, described device comprises:
Anodic current density monitoring modular M1, it is used for carrying out the Real-Time Monitoring of anodic current density, and the anodic current density data that monitor is reported the CPU of electrolyzer Controlling System;
Alumina concentration estimation block M2, it is used for carrying out the alumina concentration estimation;
The little blanking control module of aluminum oxide M3, it is used for carrying out the control of little blanking;
The CPU of electrolyzer Controlling System after it receives the anodic current density data of anodic current density monitoring modular M1 transmission, starts alumina concentration estimation block M2 antianode current density position higher and on the low side and carries out the alumina concentration estimation, if anode A
iPlace's alumina concentration is on the low side, and this CPU will assign little blanking instruction to the little blanking control module of aluminum oxide M3, the little blanking control module of aluminum oxide M3 antianode A
iThe place carries out little blanking operation, and the blanking situation is reported this CPU; If anode A
iPlace's alumina concentration is higher, and this CPU will control anode A
iNear intermediate blanking device reduces discharge quantity; This CPU starts alumina concentration estimation block M2 and again carries out the alumina concentration estimation, and confirms anode A
iWhether place's alumina concentration gets back to normal span of control; If anode A
iPlace's alumina concentration is still on the low side or higher, will repeat to reduce blanking operation or little blanking operation, until anode A
iPlace's alumina concentration is got back to normal span of control.
2. the device of balanced concentration of aluminum oxide in aluminum electrolytic bath according to claim 1, it is characterized in that described electrode current measuring density module M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of electrolyzer Controlling System.
3. the device of balanced concentration of aluminum oxide in aluminum electrolytic bath according to claim 1 and 2, it is characterized in that the function of anodic current density monitoring modular M1 Real-Time Monitoring anodic current density is finished in the following order: the equidistant pressure drop of measurement anode → calculating anodic current → calculating anodic current density → to CPU report calculation result; The little blanking control module of described aluminum oxide M3 controls the function of little blanking and finishes in the following order: receive the blanking instruction of CPU → little blanking device of startup aluminum oxide and carry out little blanking → with the blanking situation report to CPU; The alumina amount that the alumina amount that the little blanking device of aluminum oxide replenishes in the groove and intermediate blanking device reduce will be according to formula C
Al2O3={ 0.4+i
A* A
0.1/ [5.5+0.018 (T-1323)] }
2Estimate, increase or reduce blanking according to the estimation result of CPU.
4. the device of balanced concentration of aluminum oxide in aluminum electrolytic bath according to claim 1 and 2 is characterized in that, anode A
iCan be any anode in the electrolyzer, the anode numbering begins to be followed successively by in the direction of the clock A from aluminium flowing-out mouth
1, A
2, A3 ... A
N, N represents the anode number of electrolyzer.
5. the method for a balanced concentration of aluminum oxide in aluminum electrolytic bath is characterized in that, described method comprises:
(1) anodic current density monitoring modular M1 carries out the Real-Time Monitoring of anodic current density, and the anodic current density data that monitor is reported the CPU of electrolyzer Controlling System;
(2) after the CPU of electrolyzer Controlling System receives the anodic current density data of anodic current density monitoring modular M1 transmission, start alumina concentration estimation block M2 antianode current density position higher and on the low side and carry out the alumina concentration estimation, if anode A
iPlace's alumina concentration is on the low side, and this CPU will assign little blanking instruction to the little blanking control module of aluminum oxide M3, the little blanking control module of aluminum oxide M3 antianode A
iThe place carries out little blanking operation, and the blanking situation is reported this CPU; If anode A
iPlace's alumina concentration is higher, and this CPU will control anode A
iNear intermediate blanking device reduces discharge quantity; This CPU starts alumina concentration estimation block M2 and again carries out the alumina concentration estimation, and confirms anode A
iWhether place's alumina concentration gets back to normal span of control; If anode A
iPlace's alumina concentration is still on the low side or higher, will repeat to reduce blanking operation or little blanking operation, until anode A
iPlace's alumina concentration is got back to normal span of control.
6. the method for balanced concentration of aluminum oxide in aluminum electrolytic bath according to claim 5, it is characterized in that described electrode current measuring density module M1, alumina concentration estimation block M2 and the little blanking control module of aluminum oxide M3 are installed among the CPU of electrolyzer Controlling System.
7. according to claim 5 or the method for 6 described balanced concentration of aluminum oxide in aluminum electrolytic bath, it is characterized in that the function of anodic current density monitoring modular M1 Real-Time Monitoring anodic current density is finished in the following order: the equidistant pressure drop of measurement anode → calculating anodic current → calculating anodic current density → to CPU report calculation result; The little blanking control module of described aluminum oxide M3 controls the function of little blanking and finishes in the following order: receive the blanking instruction of CPU → little blanking device of startup aluminum oxide and carry out little blanking → with the blanking situation report to CPU; The alumina amount that the alumina amount that the little blanking device of aluminum oxide replenishes in the groove and intermediate blanking device reduce will be according to formula C
Al2O3={ 0.4+i
A* A
0.1/ [5.5+0.018 (T-1323)] }
2Estimate, increase or reduce blanking according to the estimation result of CPU.
8. the method for balanced concentration of aluminum oxide in aluminum electrolytic bath according to claim 5 is characterized in that, anode A
iCan be any anode in the electrolyzer, the anode numbering begins to be followed successively by in the direction of the clock A from aluminium flowing-out mouth
1, A
2, A3 ... A
N, N represents the anode number of electrolyzer.
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| CN105463513A (en) * | 2015-05-28 | 2016-04-06 | 贵阳铝镁设计研究院有限公司 | Aluminum electrolysis production aluminum oxide concentration online monitoring method and device |
| CN103710730B (en) * | 2013-12-11 | 2016-05-11 | 中国铝业股份有限公司 | Alumina concentration determinator and method in a kind of aluminium cell |
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| CN108330510A (en) * | 2018-04-10 | 2018-07-27 | 中南大学 | Apparent alumina concentration abstracting method and equipment for aluminium cell process control |
| CN108728865A (en) * | 2018-07-03 | 2018-11-02 | 中南大学 | A kind of material bin of aluminum electrolysis tank and its intelligence baiting method of automatic adjustment capacity |
| CN109183074A (en) * | 2018-11-02 | 2019-01-11 | 中南大学 | A kind of aluminum cell supplying method based on anode change cycle |
| CN109183074B (en) * | 2018-11-02 | 2020-04-07 | 中南大学 | Aluminum electrolysis cell blanking method based on pole changing period |
| CN110117798A (en) * | 2019-02-03 | 2019-08-13 | 中南大学 | A kind of the alumina concentration estimation method and device of aluminium electroloysis |
| CN112575349A (en) * | 2019-09-29 | 2021-03-30 | 沈阳铝镁设计研究院有限公司 | Aluminum oxide blanking and concentration control method for aluminum electrolysis cell |
| CN112575349B (en) * | 2019-09-29 | 2023-09-15 | 沈阳铝镁设计研究院有限公司 | Aluminum oxide blanking and concentration control method for aluminum electrolysis cell |
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