CN101008659B

CN101008659B - Method for testing fluctuation of aluminium luquid of aluminium reduction cells and test probe thereof

Info

Publication number: CN101008659B
Application number: CN200610032594A
Authority: CN
Inventors: 李贺松; 梅炽; 周乃君; 蔡祺风; 张家奇
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2006-11-16
Filing date: 2006-11-16
Publication date: 2010-05-12
Anticipated expiration: 2026-11-16
Also published as: CN101008659A

Abstract

This invention discloses one aluminum electrolyte liquid fluctuation method and its probe, which comprises the following steps: a, setting two test points in electrolyte in same position for two points difference; according to this, computing test point for electrolyte lowering; measuring electrolyte tank pressure to test electrical balance to get aluminum tank ustatic to compute real time electrode distance by unit height electrolyte lowering and tank voltage and ustatic.

Description

The method of testing and the test probe of aluminum cell aluminum liquor fluctuation

Technical field

The present invention relates to a kind of method of testing and test probe of aluminum cell aluminum liquor fluctuation.

Background technology

Moving research mainly concentrates in the research and numerical simulation of aluminium fluid wave motivation reason to the aluminium fluid wave both at home and abroad, the moving numerical simulation of aluminium fluid wave is the focus of past and present research, for ease of simulation calculation, the hypothesis of some necessity is proposed usually, as the shallow water approximate model, obtained result of calculation comparatively accurately.And the physical and chemical process in the aluminium cell is very complicated, and is quite limited by the effect that numerical simulation can obtain.But because the empirical and limitation of model parameter value in the numerical simulation, often to there be measured data and realistic model to mutually combine and verify.

Cell voltage fluctuation can reflect the moving situation of aluminium fluid wave in the groove, but usually can create a false impression to people always as the foundation of judging trough stability.As short circuit occurring in the part, under the situation that operating mode worsens, tank voltage still the little situation that fluctuates can occur.More the time, aluminium liquid is under the motion state of a kind of long period (30-50 second), big wavelength, this disappears and other rises in these fluctuations, occur the situation that fluctuates stack and cause monolithic stability, tank voltage is still stable basically, but from magnetofluidodynamic angle, this moment, trough belonged to instability, and current efficiency must reduce.

Summary of the invention

For solving the technical matters that the stable trough instability of aluminium cell tank voltage causes current efficiency to reduce, the invention provides a kind of method of testing of aluminum cell aluminum liquor fluctuation.

Another object of the present invention provides a kind of aluminum cell aluminum liquor fluctuation test probe.

The technical scheme that the present invention solves the problems of the technologies described above may further comprise the steps:

At electrolyte region same position differing heights two test points are set, measure the voltage difference between two test points;

According to spacing between voltage difference between the test point and the test point, calculate the electrolytical pressure drop of test point position unit height;

Measure the tank voltage of electrolytic tank;

Measure the electrobalance of aluminium cell, obtain the voltage drop (U of every anode of aluminium cell part except that the electrolyte pressure drop _Static);

By the electrolytical pressure drop of unit height, tank voltage and voltage drop (U _Static) calculate real-time pole span, utilize real-time pole span to calculate aluminium liquid height, being distributed by aluminium liquid height obtains emotionally condition of aluminium fluid wave.

A kind of aluminum cell aluminum liquor fluctuation test probe comprises sleeve pipe, is provided with two conductions in the sleeve pipe and visits core, and sleeve pipe is full of insulating refractories.

Technique effect of the present invention is: 1) adopt aluminum cell aluminum liquor fluctuation test probe of the present invention and method of testing, by measuring flume voltage and groove balanced voltage, it is moving directly to measure the aluminium fluid wave, can removal slot voltage relatively stable and trough is in the illusion that vacation " is stablized ", whether truly understand trough stable, if it is unstable, and can help to find unsettled root, so that the employing measure improves trough stability, compacting aluminium fluid wave is moving, improve current efficiency, the potentiality of energy-saving excavation consumption reduction.

The present invention is further illustrated below in conjunction with the drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of aluminum cell aluminum liquor fluctuation test probe among the present invention.

Fig. 2 is aluminum cell aluminum liquor fluctuation proving installation structural representation among the present invention.

Fig. 3 is aluminum cell aluminum liquor fluctuation test philosophy figure among the present invention.

Fig. 4 aluminium cell current-carrying part structural representation.

One group of aluminium fluid wave that Fig. 5 collects moves data.

Fig. 6 is the curve map of the equidistant pressure drop of aluminium Guangxi branch office 003 groove time period anode in the actual measurement.

Fig. 7 is the curve map of aluminium Guangxi branch office 003 groove time period aluminium liquid height in the actual measurement.

Embodiment

Referring to Fig. 1, Fig. 1 is the structural representation of aluminum cell aluminum liquor fluctuation test probe.Test probe adopts high temperature resistant, corrosion resistance material, test probe comprises instead " L " shape sleeve pipe 1, is provided with two conducting metals in the sleeve pipe 1 and visits core A, B, is full of insulating refractories 2 in the sleeve pipe 1, visit core A, B and stretch out termination 3-5mm, distance is 10mm between spy core A, the B.

Referring to Fig. 2, aluminum cell aluminum liquor fluctuation proving installation structural representation among the present invention.1 is probe among the figure; The 3rd, rack beam; The 4th, rack vertical rod; The 5th, bracket base; The 6th, the copper pricker; 9 aluminium cell stereotypes; 7, the 8th, voltage acquisition module.

Measuring principle of the present invention is: because any position in dielectric substrate, current potential is even along electrolytical height profile, as shown in Figure 3 constantly, this moment the top, place of popping one's head in, two distances of visiting between the core of A, B are H, this moment, the distance of C, D point-to-point transmission then was real-time pole span, if this value is ACD, the current potential that A, B are 2 can record by probe apparatus, is respectively V1 and V2, and visit the pairing pressure drop of unit height electrolyte of core position and be this moment If the electrolyte pressure drop of this moment is U _ACD, pole span value ACD can be expressed as As shown in Figure 4, tank voltage U _c=U _I-U _O, U wherein _IBe current enter current potential, U _OBe the current output terminal current potential.For aluminium cell, stable in operating mode, under the certain situation of potline current, can be similar to and think U _c-U _ACD=const.Tank voltage only changes with the variation of electrolyte pressure drop in other words, establishes the const=U in the following formula _StaticAt first measure the electrobalance of aluminium cell, can obtain U in advance like this _StaticValue.Measure the aluminium fluid wave when moving, need be with the real-time tank voltage U of capture card collection _c, and real-time interpolar pressure drop can be obtained by following formula: U _ACD=U _c--U _StaticCan calculate to such an extent that real-time pole span is like this

The relation of pole span and aluminium liquid height can be expressed as in real time: H _Al=d _Ac-ACD, wherein H _AlBe aluminium liquid height; d _AcBe anode bottom---the distance of cathode surface.

The present invention has carried out repeatedly experiment, obtains the moving data of a large amount of aluminium fluid waves.The aluminium wave-wave of certain time period B4 and two anode positions of B5 condition emotionally can see that the cycle of fluctuation is about 40S as shown in Figure 5, and amplitude is about 2cm, and two adjacent utmost point phase places are similar substantially, and just the phase place of B4 slightly shifts to an earlier date than B5.

Aluminium liquid height changes must cause the anode current changes in distribution, and the moving direct result of aluminium fluid wave is exactly the anode current fluctuation, monitors the two by experiment, finds that same period, the curve that the aluminium fluid wave moves is shockingly similar with the equidistant fluctuation of pressure drop curve of anode.As accompanying drawing 6 and accompanying drawing 7.This has illustrated that the result that the moving test macro of aluminium fluid wave is reflected is more realistic.

Claims

1. aluminum cell aluminum liquor fluctuation method of testing may further comprise the steps:

Be provided with two at electrolyte region same position differing heights and visit core A, B, measure the current potential V1 and the V2 that visit core A, B, visit the voltage difference V2-V1 between core B, the A;

According to spacing between voltage difference between spy core B, the A and spy core A, the B, calculate and visit the electrolytical pressure drop of core position unit height

H is two distances of visiting between the core of A, B;

Real-time pole span

ACD is the real-time pole span of C, D point-to-point transmission, and C, D are respectively and visit the pairing aluminium liquid of core liquid level, anode, U _ACDElectrolyte pressure drop for this moment;

Measure the tank voltage U of electrolytic tank _c=U _I-U _O, U wherein _IBe current enter current potential, U _OBe the current output terminal current potential;

Measure the electrobalance of aluminium cell, obtain the voltage drop U of every anode of aluminium cell part except that the electrolyte pressure drop _Static

Real-time interpolar pressure drop can be obtained by following formula: U _ACD=U _c-U _Static, so real-time pole span

Utilize real-time pole span to calculate aluminium liquid height, H _Al=d _Ac-ACD, wherein H _AlBe aluminium liquid height; d _AcBe the distance between anode bottom and the cathode surface, being distributed by aluminium liquid height obtains emotionally condition of aluminium fluid wave.