JPS59100281A - Control device for alkali chloride electrolytic cell - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the control, monitoring, optimal adjustment, management, and
Relating to a device for information display and automatic avoidance of short circuits.

West German Times Publication No. 1767840 describes a device that automatically optimally adjusts the electrolysis distance of an alkali chloride electrolytic cell and automatically avoids short circuits between cells. This device periodically measures the working status of individual conductive cells,
This measurement value is processed in a central control unit for controlling the electrode distance. The working status is displayed continuously on the central control unit. For safety purposes, an auxiliary device is incorporated to automatically extend the electrode distance in the event of a failure of the central control unit.

Although this device allows an optimal adjustment of the individual electrolytic cells with respect to each other, it does not make it possible to optimize the current strength of the individual electrode groups of the electrolytic cell and therefore also to maximize the current yield.

It is known from DE 27 29 732 to operate an alkaline chloride electrolytic cell using a microcomputer for each electrolytic cell or group of electrolytic cells for controlling the electrode distance. The measured values detected and processed by the microcomputer flow in voltage separation to a central detection and processing unit for central management and information display. With this device, only the mutual optimal adjustment of individual electrolytic cells is possible.
Mutual optimization of all electrode groups is not possible.

It is therefore an object of the invention that all measurement results are available both on-site and in a central location so that the chlor-alkali electrolysis work can be continued optimally even in the event of a common processing unit or detection and display unit failure, and that It is an object of the present invention to provide a control device for an alkali chloride electrolytic cell in which a current yield of 10 is achieved and short circuit monitoring and removal is possible.

The purpose is to develop a device for the control, monitoring, optimal regulation, management, information display and automatic short-circuit avoidance of alkaline chloride electrolysis, working by the amalgam method with metal electrodes and in which each electrolytic cell has a large number of conductor rails. According to the invention, one metal electrode group 21 is electrically conductively carried on each conductor rail 17, a detection and display unit 1 is arranged for each metal electrode group 21, and every detection and display unit 1 is connected to a processing unit 16. Solved by combining.

According to the invention, the detection and display unit 1 comprises a printed wiring board 22 with a one-chip computer 2, an LED bar indicator 3, an electrical measuring line 4 for electrolytic current measurement, a temperature measuring line 6, a transformer 7 and an integrated circuit having a diode 8. 9 and a photocoupler 5 with transmission lines 12, 13 to a processing unit 16.

The detection and display unit 1 is installed directly in the electrolytic cell, and the individual detection and display unit 1 and the common processing unit 1
It has turned out to be particularly advantageous to carry out the voltage separation between 6 and 6 by means of a photocoupler 5.

It is advantageous to automatically control the metal electrode groups 21 via a common processing unit 16.

According to another idea of the invention, the current yield is maximized by adjusting the metal electrode group 21 in response to the measurements of the in-situ detection and display unit.

The device according to the invention, which measures, displays and transmits the amount of current in each group of metal electrodes to a common processing unit, makes it possible to maximize the current yield and, in the event of a failure of the common processing unit, also makes it possible to carry out large tasks related to short-circuit monitoring. Reliability is guaranteed.

Next, the apparatus of the present invention will be explained with reference to the drawings.

Figure 1 shows processing unit 1 common to an alkali chloride electrolytic cell.
6 shows a coupling circuit via a detection and display unit 1 placed on each group of metal electrodes between 6 and 6; FIG. 2 shows the structure of the detection and display unit 1.

In order to detect the electrolytic current flowing through the conductor rail 17, a voltage drop ΔU is detected on the conductor rail over a predetermined distance and is transmitted via the measuring line 4 to the detection and display unit 1 integrated in the printed circuit board 22. .

The temperature of the conductor rail 17 is measured by a semiconductor temperature sensor (AD590 from Analog Devices) and introduced into the detection and display unit 1 via the electrical measuring line 6 . The strength of the current is determined from the voltage drop measured by the detection and display unit 1 while taking into account the temperature of the conductor rail 17 using the formula ΔU=f(I,T). Here, ΔU represents the voltage drop, T represents the temperature of the conductor rail, and I represents the intensity of the electrolytic current.

The strength of the electrolytic current is calculated in the one-chip computer 2 and displayed on the LED bar display 3, and
and is transmitted via transmission line 12 to processing unit 16 . Processing unit 16 retrieves the measured values of detection and display unit 1 to transmission line 13 . Via measuring lines 18, 19, processing unit 16 obtains the voltage drop of the electrolytic cell and the temperature of the electrolyte within the electrolytic cell.

Via the command line 20, the distance between the mercury cathode and the metal electrode group 21 is automatically controlled depending on the average value of the measured values of the detection and display unit 1.

Therefore, the measured values of all the metal electrodes 21 of each electrolytic cell are added to obtain an average value. A difference is formed from this average value and a preset value.

The preset value is resistance coefficient K=(U2-3.15)・FA/IZ-0.001(8
0-TZ). Here, the symbol is U2 = Voltage drop of electrolytic cell FA = Anode area IZ = Total current intensity of electrolytic cell, i.e. sum of current intensities of all metal electrode groups of each electrolytic cell TZ = Temperature of electrolyte solution °C K =Represents the resistance coefficient.

With the device of the invention K values of less than 0.08 V·A-1·m2 are possible, whereas otherwise 0.09-0.
A K value of 1V·A-1m2 is common.

An alarm is activated if the difference value exceeds a predetermined limit value.

When the metal electrode group 21 is intentionally raised or lowered in the field, it is optimally adjusted again depending on the measured values of the detection and display unit 1.

The functions of the central detection and display unit 1 will be explained with reference to FIG.

The potential difference ΔU detected on the conductor rail 17 is introduced via the electrical measuring line 4 into the one-chip computer 2 (microprocessor with PROM). The temperature of the conductor rail 17 is determined by an electrical measuring lead 6 to the one-chip computer 2 by means of a semiconductor temperature sensor (AD590 analog device).
introduced via. The one-chip computer 2 compares the obtained potential difference ΔU with the measured value of the electrolytic current, and corrects this value according to the temperature of the conductor rail 17. The corrected measurement value of the electrolytic current is displayed visually on an LED bar display and is sent via a transmission line 12 to a processing unit 16 by means of a photocoupler consisting of light emitting diodes 10, 15 and phototransistors 11, 14.

The individual functional carriers of the detection and display unit 1 are arranged on a printed circuit board 22 . The detection and display unit 1 is connected to a rectifier 9, which is supplied with current via a transformer 7 and a diode 8.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing connections between an alkali chloride electrolytic cell, a common processing unit, and a detection and display unit, and FIG. 2 is a block circuit diagram of the detection and display unit. DESCRIPTION OF SYMBOLS 1... Detection and display unit, 2... One-chip computer, 3... LED bar display, 5... Photocoupler, 9... Rectifier, 16... Processing unit,
17... Conductor rail, 21... Metal electrode group, 22...
・・Printed wiring board

Claims (1)

[Claims] 1. Automatic regulation, monitoring, optimization, management, information display and short-circuiting of an alkali chloride electrolytic cell working by the amalgam method with metal electrodes, each electrolytic cell having a large number of conductor rails. In this device, one metal electrolyte group (21) is electrically conductively connected to each conductor rail (17), one detection and display unit (1) for each metal electrolyte group (21). is arranged and all detection and display units (1) share a common processing unit (16
) A control device for an alkali chloride electrolytic cell. 2. Printed wiring board (22) with detection and display unit (1) having a one-chip computer (2), LED par indicator (3), electrical measuring leads for electrolytic current measurement (4)
, electrical measuring leads for temperature measurement (6), transformer (7)
2. Device according to claim 1, comprising a rectifier (9) with a diode (8) and a photocoupler with transmission leads (12, 13) to the processing unit (16). 3. Device according to claim 1 or 2, in which the detection and display unit (1) is installed directly in the electrolytic cell. 4. According to any one of claims 1 to 3, wherein the voltage separation between the individual detection and display units (1) and the common processing unit (16) is performed by a photocoupler (5). equipment. 5. A common processing unit (16) for the metal electrode group (21)
The device according to any one of claims 1 to 4, which is automatically controlled via. 6. Device according to any one of claims 1 to 5, in which the metal electrolysis group (21) is optimally adjusted depending on the measured values of the detection and display unit (1) in situ.