Conductive connection structure of sodium chlorate electrolytic bath

Abstract

The utility model provides a conductive connection structure of a sodium chlorate electrolytic bath. The conductive connection structure comprises an electrolytic bath group string, a feed positive electrode and a feed negative electrode, feed positive and negative electrodes adopt aluminum bars, a positive electrode connector adopts a copper-aluminum-copper composite plate, and a negative electrode connector adopts a copper-aluminum composite plate; the number of the anode joints of the electrolytic cell is twice that of the cathode joints, the anode joints adopt copper-aluminum composite plates, the cathode joints adopt copper-aluminum-copper composite plates, the anode substrates adopt titanium-aluminum composite plates, and steel-aluminum composite base plates are padded between the cathode box and the cathode joints; the number of the anode connectors is half of that of the anode connectors, and the number of the cathode connectors is twice of that of the cathode connectors; the anode substrate and the anode connector as well as the cathode conducting bar and the cathode connector are welded and connected through laminated soft aluminum bars; and the lap joint of all the conductive joints is copper-copper surface contact, so that the contact resistance is small. According to the conductive connection structure, copper is replaced by aluminum, and the investment cost of the conductor is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a conductive connection structure of an electrolytic cell in a sodium chlorate production device. Background Art

[0002] The materials of high current conductors are usually copper and aluminum. The conductivity of the two has the following differences:

[0003] First, the resistivity of aluminum is 1.54 times that of copper;

[0004] Secondly, aluminum and copper are easily oxidized when exposed to the air, and aluminum oxide and copper oxide are generated on the surface respectively. However, the conductivity of the two is very different: aluminum oxide forms a dense protective film on the surface of the aluminum to protect the aluminum inside the aluminum bar from being oxidized. Some data show that its resistivity is as high as 10^14~10^16Ω·cm, and it is usually regarded as an insulating material; while the resistivity of copper oxide is recorded to be approximately between 1 and 10Ω·m, and its conductivity is much better than that of aluminum oxide. Therefore, when conductors need to be overlapped, copper is usually used instead of aluminum.

[0005] With the development of technology, new composite plates produced by cold rolling, hot rolling, explosive composite or explosive rolling have emerged, such as copper-aluminum composite plates, steel-aluminum composite plates and titanium-aluminum composite plates. Moreover, with the increase in application fields, the output has gradually increased and the price has gradually decreased.

[0006] Sodium chlorate electrolytic cell (hereinafter referred to as electrolytic cell) is one of the important equipment in the sodium chlorate production device by electrolysis, which includes a cathode and an anode. The entire sodium chlorate electrolytic production line is usually composed of multiple electrolytic cells connected in series, connected between the positive and negative poles of the DC feeder, and the cathode and anode of adjacent electrolytic cells are connected to each other. The current passing through the electrolytic cell is very large, usually up to tens of thousands of amperes, so the conductive connection resistance cannot be too large, otherwise it will cause a large amount of power loss.

[0007] Considering the convenience of maintenance and disassembly of a single electrolytic cell, the connection of the electrolytic cell is usually overlapped, and the conductor is usually made of copper rather than aluminum, because the contact resistance of the aluminum oxide film is too large when aluminum is overlapped. Conductive connections that do not need to consider the convenience of disassembly and assembly are usually welded, and the conductive resistance of the welded connection is basically equivalent to the body resistance of the conductor.

[0008] Since copper is very expensive, about three times more than aluminum, and its specific gravity is about 3.3 times that of aluminum, for large current and large volume applications such as electrolysis systems, if copper is used for conductive connections, the investment cost will be very high. Summary of the invention

[0009] In order to reduce the investment cost of the sodium chlorate electrolysis production line and replace copper with aluminum as the conductor, the utility model proposes a conductive connection structure of a sodium chlorate electrolytic cell, wherein the conductive body is aluminum, and the conductive connection is welded or overlapped by the same material, and the overlap is made of copper and copper surface contact; compared with the conventional copper material structure, the conductive resistance is equivalent by increasing the cross-section of the aluminum material, but the investment cost of the conductor is greatly reduced.

[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0011] The DC feed conductor material is aluminum busbar, the positive terminal connector material is copper-aluminum-copper composite plate, and the negative terminal connector material is copper-aluminum composite plate;

[0012] The anode joint material of the electrolytic cell is made of copper-aluminum composite plate, the cathode joint material is made of copper-aluminum-copper composite plate, and the anode substrate material is made of titanium-aluminum composite plate;

[0013] A steel-aluminum composite pad is provided between the cathode box and the cathode joint;

[0014] The anode substrate and the anode joint of the electrolytic cell, and the negative electrode conductive bar and the negative electrode joint are connected by welding using laminated soft aluminum bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The schematic diagram of the string connection of the sodium chlorate electrolytic cells of the utility model shows the relationship between the string connection of the electrolytic cells and the connection between the positive and negative electrodes of the DC feeder;

[0016] Figure 2 It is a schematic diagram of the docking relationship between the electrolytic cell and the positive electrode of the power feeder of the utility model, indicating the docking relationship between the anode connector and the positive connector of the electrolytic cell, and the material of each conductor is also indicated in the enlarged diagram;

[0017] Figure 3 It is a schematic diagram of the docking relationship between the electrolytic cell and the negative feeding electrode of the utility model, indicating the docking relationship between the cathode connector and the negative electrode connector of the electrolytic cell. The material of each conductor is also indicated in the enlarged diagram.

[0018] The serial numbers of the above drawings are explained as follows:

[0019] 1-electrolytic cell, 11-cathode joint, 12-steel-aluminum composite backing plate, 13-cathode box, 14-anode substrate, 15-laminated soft aluminum row, 16-anode joint;

[0020] 2-feeding positive electrode, 21-positive electrode connector, 22-positive electrode conductive bar;

[0021] 3-feeding negative pole, 31-negative pole conductive bar, 32-negative pole connector. DETAILED DESCRIPTION

[0022] In conjunction with the above drawings, the specific implementation of the present utility model is described as follows:

[0023] like Figure 1 As shown, the sodium chlorate electrolytic cell string of the utility model is composed of a plurality of electrolytic cells 1 connected in series, connected between the positive feeder 2 and the negative feeder 3, the electrolytic cell 1 comprises a cathode connector 11, a steel-aluminum composite backing plate 12, a cathode box 13, an anode substrate 14, a laminated soft aluminum bar 15 and an anode connector 16, the positive feeder 2 comprises a positive connector 21 and a positive conductive bar 22, and the negative feeder 3 comprises a negative conductive bar 31 and a negative connector 32;

[0024] As shown in the figure, the materials of the positive electrode conductive bar 22 and the negative electrode conductive bar 31 are both made of aluminum bars, the material of the positive electrode connector 21 is made of copper-aluminum-copper composite plate, and the material of the negative electrode connector 32 is made of copper-aluminum composite plate;

[0025] As shown in the figure, the anode connector 16 of the electrolytic cell 1 near the positive electrode 2 of the feeder at one end is fixed by overlapping bolts with the positive electrode connector 21, and the cathode connector 11 of the electrolytic cell 1 at the other end is fixed by overlapping bolts with the negative electrode connector 32, and the electrolytic cell 1 in the middle is fixed by overlapping bolts with the anode connector 16 and the cathode connector 11 of the adjacent electrolytic cell 1;

[0026] The material of the anode joint 16 of the electrolytic cell 1 shown in the figure is a copper-aluminum composite plate, the material of the cathode joint 11 is a copper-aluminum-copper composite plate, the material of the anode substrate 14 is a titanium-aluminum composite plate, and the material of the cathode box 13 is carbon steel;

[0027] As shown in the figure, the anode substrate 14 and the anode connector 16 of the electrolytic cell 1, and the negative electrode conductive bar 31 and the negative electrode connector 32 are connected by welding using laminated soft aluminum bars 15.

[0028] Figure 2 It shows the docking relationship between the electrolytic cell 1 and the positive feeding electrode 2. The anode substrate 14 of the electrolytic cell 1 is made of an aluminum-titanium composite plate. As shown in the partial H enlarged view, the titanium layer faces the cathode box 13, and a plurality of laminated soft aluminum bars 15 are welded on the aluminum layer side. An anode connector 16 is welded to the other end of each laminated soft aluminum bar 15. The number of anode connectors 16 is twice that of cathode connectors 11.

[0029] As shown in the figure, the end of the positive conductive bar 22 is welded with multiple positive connectors 21, and the number of positive connectors 21 is half of the anode connector 16. As shown in the enlarged local K in the figure, the copper surfaces on both sides of each positive connector 21 can be overlapped with the single-side copper surfaces of the two anode connectors 16 respectively.

[0030] Figure 3It shows the docking relationship between the electrolytic cell 1 and the negative feeding electrode 3. As shown in the figure, a plurality of cathode connectors 11 are arranged on the outside of the cathode box 13 of the electrolytic cell 1. A steel-aluminum composite pad 12 is placed between the cathode connector 11 and the cathode box 13. As shown in the partial Q enlarged view, the two are respectively welded and connected with the same material; the negative feeding electrode 3 is equipped with negative electrode connectors 32 twice the number of the cathode connectors 11. Each negative electrode connector 32 is welded to the end of the negative electrode conductive bar 31 through a laminated soft aluminum bar 15. Every two negative electrode connectors 32 are docked with one cathode connector 11. As shown in the partial Q enlarged view, the copper surfaces on both sides of the cathode connector 11 can be overlapped with the single-side copper surfaces of the two negative electrode connectors 32 respectively.

[0031] It should be noted that before welding the above-mentioned copper-aluminum composite plate or copper-aluminum-copper composite plate joint, as shown in the partial K and Q enlarged figures, the local copper layer of the to-be-welded portion needs to be removed to ensure that the aluminum substrate is welded with the same material as other aluminum materials.

[0032] In the implementation of the above method, the conductive body is made of aluminum instead of conventional copper, and copper is used only in the overlap part to contact the copper surface, avoiding the problem of excessive aluminum overlap resistance; because the resistivity of aluminum is about 1.54 times that of copper, if the conductive resistance is to be replaced with the same, the cross-sectional area of ​​the aluminum conductor needs to be increased by 1.54 times, that is, the volume needs to be increased by 1.54 times. Since the specific gravity of aluminum is 0.3 times that of copper, the weight of the aluminum conductor is about 0.462 (1.54x0.3) times that of the copper conductor, and the price of the aluminum conductor is about 0.3 times that of the copper conductor. In the end, the investment cost of the aluminum conductor is about 0.1386 (0.462x0.3) times that of the copper conductor. Although the price of the composite plate used in the overlap part is higher than that of aluminum, its volume accounts for a small proportion.

[0033] In summary, the beneficial effects of the utility model are as follows: in large current and large volume occasions such as sodium chlorate electrolysis, conductive connection using aluminum instead of copper is achieved, and under the condition of equal conductive resistance, the investment cost of the conductor is greatly reduced.

Claims

1. A conductive connection structure of a sodium chlorate electrolytic cell, comprising a series of multiple electrolytic cells (1) and a positive feeder (2) and a negative feeder (3) connected to the two ends thereof, wherein: The electrolytic cell (1) comprises a cathode box (13), an anode substrate (14), and a plurality of cathode joints (11) and anode joints (16). The number of anode joints (16) is twice that of cathode joints (11). The anode joints (16) are made of a copper-aluminum composite plate, the cathode joints (11) are made of a copper-aluminum-copper composite plate, the anode substrate (14) is made of a titanium-aluminum composite plate, and a steel-aluminum composite pad (12) is provided between the cathode box (13) and the cathode joints (11). The positive feeding electrode (2) comprises a positive electrode conductive bar (22) and a plurality of positive electrode connectors (21), the positive electrode conductive bar (22) is made of aluminum, the positive electrode connectors (21) are made of copper-aluminum-copper composite plates, and the number of positive electrode connectors (21) is half of the number of anode connectors (16); The feed negative electrode (3) comprises a negative electrode conductive bar (31) and a plurality of negative electrode connectors (32), the negative electrode conductive bar (31) is made of aluminum, the negative electrode connectors (32) are made of a copper-aluminum composite plate, and the number of negative electrode connectors (32) is twice that of cathode connectors (11); The anode substrate (14) and the anode connector (16), as well as the negative electrode conductive bar (31) and the negative electrode connector (32) are both connected by welding using laminated soft aluminum bars (15).

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