JPS6040517B2 - Improved electrolyzer electrical circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical circuit in which a number of electrolytic cells are electrically connected in series.

More specifically, in an electric circuit of an electrolytic device in which a large number of electrolytic cells are electrically connected in series and an equalizer is provided between each electrolytic cell, the electric circuit of an electrolytic cell group in which the equalizer is provided with a water cooling device. .

Accordingly, there are two methods for electrolyzing an aqueous alkali metal chloride solution: the mercury method, which uses mercury as the cathode, and the asbestos diaphragm method, which uses an asbestos diaphragm between the anode and cathode to separate the anode chamber and cathode chamber. In recent years, an ion exchange membrane method using an ion exchange membrane instead of an asbestos diaphragm has been developed and put into practical use.

In Japan, from the perspective of preventing environmental pollution caused by mercury, the conversion from mercury laws to mercury-free laws is being implemented under the government's administrative guidance.

In the mercury method, generally a large number of electrolytic cells are electrically connected in series, and an equalizer is installed between each electrolytic cell in order to uniformly distribute the electrolytic current of the electrolytic cells. In addition, in the diaphragm method, generally a large number of electrolytic cell groups are electrically connected in series, and the purpose of uniformly distributing the electrolytic current of the electrolytic cells and the purpose of distributing the electrolytic current of the electrolytic cells uniformly is to Similar to the mercury method, an equalizer is installed for the purpose of forming a short circuit in the electrolytic cell when a particular electrolytic cell is stopped using a mobile jumper switch.

When the electrolytic cell is in operation, this equalizer is sufficient for the purpose of uniformizing the electrolytic current in the electrolytic cell. It is sufficient that the cross-sectional area of the equalizer provided for uniform distribution is about half or less of the cross-sectional area of the conductor required to flow the entire electrolytic current.

However, when one particular electrolytic cell in a group of electrolytic cells is turned off using a mobile jumper switch, all the electrolytic current flows through the equalizer, so there is only enough electrolytic current to flow through the equalizer. A large cross-sectional area is required. However, installing an equalizer with a large cross-sectional area increases construction costs and is uneconomical. The present inventors have developed a system in which a large number of electrolytic cells are connected in series, and between each electrolytic cell, the purpose is to equalize the electrolytic current distribution in the electrolytic cell, and to create a short circuit when the electrolytic cell is stopped. For the purpose of forming the electrolytic cell, we investigated various electrical circuits for the electrolytic cell that would be economical by reducing the construction cost of the electric circuit for the electrolytic cell equipped with the equalizer. It has been found that the cross-sectional area of the equalizer can be reduced to approximately half by flowing cooling water through the water cooling device to prevent an excessive rise in temperature of the equalizer.

Moreover, by doing so, the voltage drop in the equalizer when the electrolytic cell is stopped becomes slightly large, but the stopping time of the electrolytic cell is generally short, so it is not uneconomical. BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the present invention, reference is made to the accompanying drawings.

Figure 1 shows a large number of electrolytic cell groups electrically connected in series.
In addition, an equalizer is provided between each electrolytic cell, and this is a general electric circuit of an electrolytic cell when one electrolytic cell in a group of electrolytic cells is stopped using a mobile jumper switch. 1
-1, 1-2, . . . , 1-h are electrolytic cells electrically connected in series and connected to the rectifier 2.

When this electrolyzer group is in operation, the flow of electrolytic current is
Positive terminal of rectifier 2 → positive side main strip 4 → equalizer 3 equipped with water cooling device → equalizer anode terminal 6
→ Anode flexible 8 → Electrolytic tank anode terminal 7 → Electrolytic tank 1-
i → Electrolyzer cathode terminal 9 → Cathode flexible 11 → Equalizer cathode terminal 10 → Equalizer 3 equipped with water cooling device → Equalizer anode terminal 6 → Anode flexible 8
→ Electrolytic tank anode terminal 7 → Electrolytic tank 1-2, 1-3,・
...11h → Electrolyzer cathode terminal 9 → Cathode flexible 11 → Equalizer cathode terminal 10 → Equalizer 3 equipped with water cooling device → Negative side main strip 5 → Rectifier 2
is flowing through the negative terminal circuit. For example, when attempting to stop electrolytic cell 1-2 from the electric circuit of such a group of electrolytic cells, the anode side busbar 13 of the mobile jumper switch 12 is vertically attached to the equalizer 3 equipped with a water lining device using bolts and nuts. In addition, the cathode side busbar 14 of the jumper switch 12 is connected to the equalizer 3 equipped with a water cooling device using bolts and nuts, etc., and cooling water is allowed to flow through the water cooling devices of both equalizers to cool both equalizers. By opening the jumper switch, the electrolytic cells 1 and 2 can be stopped in case of excessive temperature rise in both equalizers 3.

FIG. 2 shows one embodiment of the equalizer, and is not limited to this embodiment.

A through hole 20 for flowing cooling water is provided in the equalizer 3 itself, and the equalizer 3 is cooled by flowing the cooling water. 21 is a bolt hole for connecting the jumper switch to the bus bar.

22 is a bolt hole for flexible connection.

FIG. 3 is a cross-sectional view taken along the line A-A' in FIG. 2, in which a through hole 20 is provided to allow cooling water to flow through the equalizer 3 itself.

Other application examples of water cooling equipment include b and c. In b, a semicircular pipe 31 is attached to the equalizer 3 by welding or the like in order to flow cooling water to the upper and lower parts of the equalizer 3, and the cooling water is made to flow into the space 32 of the semicircular pipe 31. be. In the example shown in c, a groove 42 is cut in the side surface of the equalizer 3 and a flat plate 41 is attached by welding or the like, so that cooling water flows through the groove 42. Example Using the electric circuit of the electrolytic cell group shown in Fig. 1, using an equalizer 3 equipped with a water cooling device having a cross section as shown in Fig. 3, an electrolytic current of 80 kA was applied to the electrolytic cell group. The operation of one of the electrolytic cells was stopped using a mobile jumper switch, and the temperature and voltage drop of the equalizer were measured when all the electrolytic current was passed through the jumper switch circuit.The following results were obtained. .

Incidentally, the voltage drop of the equalizer in the operating state of the electrolytic cell was 3 V. Equalizer length
170 Specific rib thickness 6 & broadside height,
50mm Water cooling hole diameter 250×2 Honmura Copper Equalizer temperature 4400 (Outside air temperature 1400) Equalizer voltage drop
26 V Comparative Example Using the same electric circuit of the electrolytic cell group as in the example, and using an equalizer without a water cooling device in equalizer 3, an electrolytic current of 8 plates A was applied to one electrolytic cell of the electrolytic cell group. When the operation was stopped using a mobile jumper switch and all the electrolytic current was passed through the jumper switch circuit, the temperature and voltage drop of the equalizer 3 were measured, and the following results were obtained.

In addition, the voltage drop of the equalizer in the operating state of the electrolytic cell was 4 Yanagi V. Equalizer dimensions length
170 meters thick, 7 meters tall
80 ratio Steel Equalizer temperature 7800 (Outside air green 1500) Equalizer voltage drop
16 skin V

[Brief explanation of the drawing]

FIG. 1 is an electrical connection diagram showing the electrical circuit of the present invention,
FIG. 2 is a sketch of a water-cooled equalizer used in the present invention. FIG. 3 is a cut-away explanatory diagram showing a specific embodiment of the water-cooled equalizer. Multi-figure hair z uneven hair explanation

Claims (1)

[Claims] 1. An improved electric circuit in which a large number of electrolytic cells are electrically connected in series and an equalizer is provided between each electrolytic cell, and the equalizer is provided with a water cooling device. Electrolyzer electrical circuit. 2. Item 1, characterized in that when stopping only one electrolytic cell out of a large number of electrolytic cells using a mobile jumper switch, the equalizer is water-cooled by flowing cooling water through a cooling device provided in the equalizer. electrical circuit of an electrolytic cell. 3. The electric circuit for an electrolytic cell according to item 1 or 2, wherein the electrolytic cell is a diaphragm electrolytic cell. 4. The electric circuit according to item 1 or 2, wherein the diaphragm of the diaphragm electrolytic cell is an asbestos diaphragm or a synthetic diaphragm mainly composed of asbestos. 5. The electric circuit according to item 1 or 2, wherein the diaphragm of the diaphragm electrolytic cell is an ion exchange membrane.