SU717156A1 - Method of electrolyzer interpole space state control - Google Patents

Description

(54) METHOD FOR CONTOURING THE CONDITION OF THE INTERPOLAULAR ELECTULIZER PUME

one

Isolation refers to the industrial production of aluminum by the electrolysis of cryol-to-alumina melts, more specifically to the control of the electrochemical parameters of the interpolar gap of the aluminum electrolyzer, and j can be used to estimate the area of anodized metal and the amplitude of the will on the surface of the liquid cathode.

The known method of monitoring the state of the interpolar gap of the electrolyzer, including the measurement of the parameters of the fluctuations of the electromotive forces of the induction sensors, penetrated by the electromagnetic zero of the analyzed section of the electrolyzer P).

The aim of the invention is to improve the accuracy of the control.

This is achieved by the fact that the extracted pulsations of the electromotive force taken from the output of the induction sensor amplify and separate the negative and positive pulses from a number of levels chosen according to the technological parameters of the electrolyzer, and on the amplitude and frequency of the pulsations of the electromotive force at the selected levels The area of the pimple, the period and the height of the waves on the surface of the liquid cathode.

The method is carried out as follows.

It is known that isolated acts of discontinuous disturbance of individual sections of the interpulse resistance of the electrolyzer, arising from the accidental joining of the anode base to the metal, cause an abrupt change in the magnetic field around this section.

FIG. 1 shows the electroliferator (the moment of the submuscular anode section with the liquid cathode is shown) and the structural scheme of the device, the implementation; 1 is the method; Fig: 2 graph of the noise at the output of the measuring device.

The electrolyzer contains a casing of 1 anode, a melt of 2 aluminum (liquid cathode), a casing of 3 cathodes, a section 4 of the metal armpit with an anode, 5 - lines of concentration of the current of the ampus, 6 - lines of magnetic field strength created by the current of bobbin.

The device includes an induction frame 7, covering the side of the casing, the amplifier 8, de Z. tctor 9, limiter 10 on five levels of an electronic key 11, a counter of the number 12 of limited pulses, a 136 digital voltmeter 14 V. A result of the metal being pinched on the anode, fluctuations of the horizontal component of the electrolyzer magnetic field appear. Fluctuations Hg are induced in an induction date (frame) 7 by an electromotive force (EMF) of 100-3 (X) µV / turn. Fluctuations of the EMF noeiyha to the input of the amplifier 8 with adjustable gain (1000-10000). The gain is adjusted so that the output is an unlimited signal with an amplitude not exceeding one volt. The amplified fluctuations arrive at detector 9. From the detector output, positive or negative half-periods of fluctuations to limiter 10, which has five levels: O, 0.2, 0.4, 0.6, 0.8 V. Signals limited to the selected level arrive at the electronic key (time relay) II, which connects the limiter to the integrator 14 and the counter 12 to „607z.J 0-sec. The counters record the number of pulses at a selected level of the limiter (I-V, Fig. 2), and the integrator determines the total area of these pulses. For example, at zero, there is no limit. . ..Ts,. ; . 1 takes the impulse area $ «Г u (t) dt during the time ti-ti, at the And level - during the time ti-t III - tj-t7, IV - tj-tg V - t4-ts ;. The resultant voltage at the integrator output is determined by the total area of all fluctuating pulses over the time interval determined by the electronic key 4 After the integration is completed, the resulting voltage from the 1g integrator output is read by the digital voltmeter, and the count meter is simultaneously removed. The area of the taint is determined from the ratio ;; r, 4 Si (t) st SHO K, where 1, Ti — the observation time is specified by key 4; . . :.: - .. S. (t) is the area of the i-ro pulse at the chosen limitation level,, 2 ... j N-sequence number of the pulse, K-coefficient proportional to tee; N is the number of accumulations and Miles per observation. For graduation of the iro TShuiidi shdmykan device, a preliminary increase of the polarity: the pole distance to the elimination of accidental metal nets and anode, and then introduced under the anode of coal blocks with a known contact area. By creating a certain area of the metal to the anode, ZSH1er ktiffmecTBa pulses and are produced. their summation} area during the observation time T, -T punishment-. home of levels of limitation. The resulting calibration graph of the relationship between the KbHtaKta area of the anode-metal and the area of fluctuating pulses is used further in the control. The amplitude of the waves on the surface of the melt is judged by the ratio JXW rsf (t) dt 5X (tMt where Sj, (t) is the impulse area at level I. IV, V. The number of submarine N during the observation time is related to the period of waves the aluminum surface, i.e., the wave period will be proportional to the average value of the number of joints or upper levels of Tg-T. On the layout assembled according to the functional diagram of Fig. 1 (except for the counter), a preliminary assessment of the dependence of the area of fluctuations of impulses on the interpolar pole was carried out distances. The data are given in the table. The measurements were carried out on an electrolytic cell with a normal technological mode, the interpolar distance 4 cm was taken arbitrarily, the subsequent measurements were made while the anode was raised 0.5 cm. The height of the anode was measured with a ruler. The fluctuations of the horizontal component of the magnetic field are related to the parameter or interpolar gap of the electrolyzer. At the levels of limitation III, V, V, a decrease in the intensity (area) of the fluctuation from an increase in the interpolar distance is noticeable. The introduction of the method will increase the current output by 0.5-1.5%,

Claims (1)

. Invention Formula The method of monitoring the state of the cell spacing of a electrolyzer with a liquid cathode, such as aluminum, including measurement of the fluctuation parameters of electromotive forces of twin coupling sensors, through} 1 the electromagnetic field of the electrolytic portion of the electrolyzer, distinguished by 4to, in order to increase the accuracy of control, the electromotive force pulsations removed by from the output of the induction sensor, negative and positive pulses are amplified and divided into a number of levels selected from parameters of the electrolyzer, and the amplitude and frequency of pulsations of the electromotive force at selected levels determine the area of the hooking, the period and the height of waves on the surface of the liquid cathode. Information sources, taken into account during the examination 1. USSR Copyright Certificate No. 387030, cl. C 25 C 3/20, 1972. 0.1 / f j C; r iCfA