Chlorine hydrochloric acid electrolytic bath group

Abstract

The invention discloses a chlorohydrochloric acid electrolytic bath group which comprises at least two electrolytic baths, a cathode bottom plate and an anode bottom plate which are opposite to each other are hermetically fixed at two ends of a shell of any electrolytic bath, and a plurality of anode plates and cathode plates which are arranged at intervals are vertically arranged on the anode bottom plate and the cathode bottom plate respectively; a cathode current-conducting plate and an anode current-conducting plate are respectively arranged on the opposite surfaces of the cathode bottom plate and the anode bottom plate, the cathode plates and the anode plates in the same electrolytic cell are arranged in parallel in a staggered manner, the distance between the cathode plates and the anode plates is 2.9 mm, and the area of the anode plates in the electrolytic cell group is 42 m < 2 >. By optimizing the distance between the cathode plate and the anode plate, the distance between the cathode plate and the anode plate is reduced on the premise of ensuring smooth operation, the number and the area of the anode plate are increased, the cell pressure is reduced, and the power consumption is reduced; meanwhile, spacing buckles on the cathode plate and the anode plate are optimized and improved, so that the distance between the cathode and the anode is uniform, and the power consumption is further reduced. The overall dimension of the electrolytic cell set is kept unchanged, and the electrolytic cell set can be directly installed on an original system.

Description

Technical Field

[0001] The invention relates to the technical field of bipolar electrolytic cells, and in particular to a chlorine-hydrochloric acid electrolytic cell group. Background Art

[0002] 1. Electrolysis principle: Sodium chlorate is produced by electrolysis of salt water. The salt solution passes through two electrodes to produce intermediate chemicals, which then produce chlorate under appropriate conditions. The electrolysis of salt is also the basic principle of some chemical production processes, such as the production of chlorine and alkali. The final product depends on the design of the electrolytic cell, the process design and the operating conditions. The electrolysis of sodium chloride aqueous solution to produce sodium chlorate is a complex electrochemical and chemical reaction that depends on temperature, pH, electrolyte concentration, and the potential and voltage of the anode and cathode.

[0003] 2. The main reaction of sodium chlorate production: In the sodium chlorate production process, gaseous chlorine, hydrogen and sodium hydroxide are produced. The electrolytic cell does not separate the anode and cathode products, but allows them to further react to produce sodium chlorate. Sodium hydroxide and hydrogen react to produce sodium hypochlorite, which then further reacts to produce sodium chlorate.

[0004] The overall reaction equation of the sodium chlorate process is as follows:

[0005] (1) NaCl + 3 H2O + Δh → NaClO3 + 3H2

[0006] The reaction is initiated electrically between electrodes.

[0007] The reaction at the anode is as follows:

[0008] (2) 2 Cl - → Cl2 + 2e -

[0009] The reactions occurring at the cathode are as follows;

[0010] (3) 2 H2O + 2e - → 2OH - + H2

[0011] Reactions (2) and (3) are the primary reactions in the electrolytic cell. Reaction (1) is a secondary reaction that occurs in large quantities under specific conditions, thereby generating chlorate.

[0012] Between the two electrodes, free chlorine from the anode reacts with OH in the electrolyte. - The reaction produces hypochlorite and chloride ions.

[0013] Cl2(dissolved)+2OH - →OCl - +Cl - +H2O

[0014] Chlorine also reacts with water to form hypochlorous acid and hydrochloric acid.

[0015] Cl2(dissolved)+H2O→HOCl+HCl

[0016] In a large amount of electrolyte, hypochlorous acid and hypochlorite ions react to form chlorate and hydrochloric acid

[0017] 2HOCl+OCl - →ClO3 - +2HCl

[0018] 3. Side reactions: There are a lot of side reactions in the electrolytic cell that reduce the efficiency of the current. Because this is an electrolytic process, other electrolytic reactions also occur. The two important intermediates formed are hypochlorite and hypochlorous acid, which usually react together to form chlorate. However, hypochlorite reacts with water at the cathode and is reduced to chloride ions and OH. - .

[0019] OCl - +H2O+2e - →Cl - +2OH -

[0020] The reaction is initiated by a film of hydrated chromium oxide at the cathode, which reduces the diffusion of hypochlorite into the cathode.

[0021] Under the action of electric current, hypochlorous acid reacts with water at the anode to produce oxygen and hydrochloric acid.

[0022] 6HOCl+3H2O→3 / 2O2+4HCl+2ClO3 - +8H++6e -

[0023] This reaction can be minimized by controlling the pH of the solution within a narrow range. A low pH can reduce the generation of oxygen. However, too low a pH can cause chlorine to escape from the solution, thereby reducing the generation of sodium chlorate. pH control is important for production efficiency.

[0024] In addition, a small amount of chlorine gas escapes from the chlorate solution.

[0025] Cl2(in solution) → Cl2(gas)

[0026] If the salt solution used to operate the locomotive contains heavy metal ions such as Cu, Ni, Co, and V, catalytic separation of hypochlorous acid and hypochlorite ions will occur, generating oxygen and hydrochloric acid.

[0027] 2HOCl→2HCl+O2(gas)

[0028] catalytic

[0029] In addition, if the brine contains calcium and magnesium, they will react with the hydroxide ions generated at the cathode and precipitate out. This can cause the cell voltage to increase and other problems. Only ion-exchange membrane brine can be used in the chlorate system before the initial commissioning process, and only softened water can be added to the chlorate system during normal production.

[0030] The anode area of ​​the electrolytic cell group of the chlorine-hydrochloric acid production line used in the applicant's existing workshop is 38 square meters, the spacing between the cathode and anode plates is 3.5 mm, the operating current density is 2.95KA / square meter, the total operating current is 112.0KA, and the theoretical power consumption of the electrolytic cell is 4950KWh / ton of sodium chlorate. The annual output of the applicant's company's electrolytic cell group reaches 60,000 tons. With such a high annual output, the power consumption of the currently used electrolytic cell group needs to be further reduced to achieve the purpose of reducing costs. Therefore, the structure of the existing electrolytic cell group needs to be optimized and improved. This invention comes from this. Summary of the invention

[0031] In view of at least one of the above-mentioned technical problems, the object of the present invention is to provide a chlorine-hydrochloric acid electrolytic cell group with lower power consumption and lower cost.

[0032] The technical solution of the present invention is:

[0033] The object of the present invention is to provide a chlorine-hydrochloric acid electrolytic cell group, comprising at least two electrolytic cells, wherein opposite cathode bottom plates and anode bottom plates are sealed and fixed at both ends of the shell of any of the electrolytic cells, a plurality of anode plates arranged at intervals are vertically arranged on the anode bottom plate, a plurality of cathode plates arranged at intervals are vertically arranged on the cathode bottom plate, a cathode conductive plate and an anode conductive plate are respectively arranged on the opposite sides of the cathode bottom plate and the anode bottom plate at both ends of the electrolytic cell group, the cathode plates and the anode plates in the same electrolytic cell are arranged in parallel and staggered, the spacing between the cathode plate and the adjacent anode plate in the same electrolytic cell is 2.9 mm, and the area of ​​the anode plates in the electrolytic cell group is 42 m 2 .

[0034] Preferably, the flatness of any one of the cathode plate and the anode plate is ≤0.4, and the unevenness of welding deformation is ≤0.5 mm.

[0035] Preferably, a plurality of spacer buckles are provided on any of the anode plates.

[0036] Preferably, the material of any of the spacer buckles is polytetrafluoroethylene.

[0037] Preferably, the spacer buckles on any of the anode plates include a plurality of first spacer buckles spaced apart on the periphery away from one side of the anode bottom plate and a plurality of second spacer buckles spaced apart at a middle position close to one side of the anode bottom plate.

[0038] Preferably, the first spacer buckle is an H-type spacer buckle, and the second spacer buckle is a round button-type spacer buckle.

[0039] Preferably, the second spacer buckles include two rows, and the second spacer buckles in a row close to the periphery of the anode plate are distributed more densely than the second spacer buckles in a row far from the periphery of the anode plate.

[0040] Preferably, any of the circular button-type spacer buckles includes a first fastener and a second fastener that can be fastened together, the first fastener includes a T-shaped first buckle body and an inverted cone buckle portion formed at the outer end of the first buckle body, and the second fastener includes an inverted T-shaped second buckle body and a button hole formed in the second buckle body for fastening with the inverted cone buckle portion.

[0041] Preferably, the shell of any electrolytic cell is fixed to its corresponding sealed anode bottom plate by bolts and a gasket is sealed between the two, and insulating sleeves and washers are respectively provided between the bolts and the anode bottom plate and between the bolts and the shell of the electrolytic cell.

[0042] Preferably, at least two of the electrolytic cells are connected in a straight line and assembled into a whole, and an electrical connector perpendicular to the cathode bottom plate and the anode bottom plate of any two adjacent electrolytic cells is provided between the cathode bottom plate and the anode bottom plate of the electrolytic cells.

[0043] Compared with the prior art, the advantages of the present invention are:

[0044] The chlorine-hydrochloric acid electrolytic cell group of the present invention optimizes the spacing between the cathode and anode plates, reduces the spacing between the cathode and anode plates while ensuring smooth operation, increases the number and area of ​​the anode plates, reduces the cell pressure, and reduces power consumption; at the same time, the spacer buckles on the cathode and anode plates are optimized and improved, so that the spacing between the cathode and anode plates is uniform, further reducing power consumption. The outer dimensions of the electrolytic cell group remain unchanged, and can be directly installed on the original system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0046] Figure 1 It is a structural schematic diagram of a chlorine-hydrochloric acid electrolytic cell group according to an embodiment of the present invention;

[0047] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0048] Figure 3A top view of a chlorine-hydrochloric acid electrolytic cell group according to an embodiment of the present invention;

[0049] Figure 4 for Figure 3 A partial enlarged view of the middle B part;

[0050] Figure 5 It is a structural schematic diagram of the connection structure of two adjacent electrolytic cells of the chlorine-hydrochloric acid electrolytic cell group according to an embodiment of the present invention;

[0051] Figure 6 A top view of the connection structure of two adjacent electrolytic cells of a chlorine-hydrochloric acid electrolytic cell group according to an embodiment of the present invention;

[0052] Figure 7 It is a schematic structural diagram of the anode plate of the chlorine-hydrochloric acid electrolytic cell group according to an embodiment of the present invention when the second spacer buckle is not assembled;

[0053] Figure 8 The schematic diagram of the structure of the anode plate of the chlorine-hydrochloric acid electrolytic cell group (the upper figure in the figure is the prior art before improvement, and the lower figure is the improved embodiment of the present invention);

[0054] Fig. 9 Three views (front view, side view and top view) of the first spacer buckle on the long side of the anode plate of the chlorine-hydrochloric acid electrolytic cell group according to the embodiment of the present invention;

[0055] Fig.10 It is a three-view diagram (front view, side view and top view) of a first interval of a short side of an anode plate of a chlorine-hydrochloric acid electrolytic cell group according to an embodiment of the present invention;

[0056] Fig.11 The present invention is a schematic structural diagram of the cathode plate of a chlorine-hydrochloric acid electrolytic cell group (the upper figure in the figure is the prior art before improvement, and the lower figure is the improved embodiment of the present invention).

[0057] Wherein: 10, electrolytic cell; 11, shell; 20, anode bottom plate; 21, anode plate; 211, first spacer buckle; 212, second spacer buckle; 2121, first fastener; 21211, first buckle body; 21212, inverted cone buckle portion; 2122, second fastener; 21221, second buckle body; 21222, buckle hole; 30, cathode bottom plate; 31, cathode plate; 40, anode conductive plate; 50, cathode conductive plate; 60, electrical connector; 70, gasket; 80, hexagonal bolt; 81, hexagonal nut; 90, insulating sleeve; 100, butterfly washer; 110, washer. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0059] See also Figures 1 to 11 The chlorine-hydrochloric acid electrolytic cell group of the embodiment of the present invention comprises at least two electrolytic cells 10 ( Figure 1 and Figure 3 The two ends of the shell 11 of each electrolytic cell 10 are also as shown in FIG. Figure 1 The left and right ends are respectively sealed and fixed with a cathode bottom plate 30 and an anode bottom plate 20 opposite to each other. Figure 6 As shown, a plurality of anode plates 21 are vertically arranged at intervals on the anode bottom plate 20, and a plurality of cathode plates 31 are vertically arranged at intervals on the cathode bottom plate 30. Figure 1 The cathode bottom plate 30 and the anode bottom plate 20 at the left and right ends are provided with a cathode conductive plate 50 and an anode conductive plate 40 respectively on the opposite sides. Figure 4 As shown, the cathode plate 31 and the anode plate 21 in the same electrolytic cell 10 are arranged in parallel and staggered. In the chlorine-hydrochloric acid electrolytic cell 10 group of the embodiment of the present invention, the spacing between the cathode plate 31 and the adjacent anode plate 21 in the same electrolytic cell 10 is 2.9 mm. Compared with the electrolytic cell 10 in the prior art in which the spacing between the cathode and the anode is 3.5 mm, the spacing between the cathode and the anode becomes smaller, and the cell pressure becomes lower. Since the spacing between the cathode and the anode plates 21 becomes smaller, the number of anode plates 21 can be increased. In the electrolytic cell 10 group of the embodiment of the present invention, the number of anode plates 21 increases by 4, and the area of ​​the anode plates 21 increases from 38m2 to 42m2, and the power consumption is also reduced. It should be noted that the spacing between the anode and cathode plates 21 in the embodiment of the present invention is not set randomly, but is the data obtained by optimizing the design considering that the entire electrolytic cell 10 group system is a natural circulation, and a certain space needs to be reserved to make the gas and liquid run smoothly.

[0060] According to some embodiments of the present invention, as the distance between the cathode and the anode becomes smaller, the requirements for the manufacturing process and manufacturing accuracy will inevitably become higher. In order to ensure the uniformity of the distance between the cathode and the anode, the electrolytic cell 10 groups of the embodiments of the present invention have a flatness of any cathode plate 31 and anode plate 21 ≤0.4, and the welding deformation unevenness ≤0.5mm.

[0061] According to some embodiments of the present invention, in order to make the spacing between the positive and negative plates 21 more uniform and further reduce power consumption, the structures of the anode plate 21 and the cathode plate 31 are also improved in the embodiments of the present invention. Specifically, the cathode plate 31 of the embodiment of the present invention is based on the existing cathode plate 31 and has the surrounding spacers (such as Fig.11 As shown in the figure above, this spacer buckle is an H-type spacer buckle 311', which is similar to Fig. 9 The H-shaped first spacer buckle 211a on the existing anode plate 21 shown in the figure is omitted. Since the applicant found that the peripheral spacer buckle setting on the cathode plate 31 caused material accumulation and corrosion of the cathode plate 31 at the spacer buckle position, the applicant omitted the peripheral spacer buckle on the cathode plate 31 on this basis (such as Fig.11 As shown in the figure below). At the same time, the spacer buckles on the anode plate 21 are also improved. Specifically, the existing anode plate 21 is also provided with spacer buckles on the periphery (such as Figure 8 As shown in the figure above, this spacer buckle is also an H-shaped spacer buckle 211'), and the existing anode plate 21 has an H-shaped spacer buckle on the periphery (for the convenience of description and distinction, this H-shaped spacer buckle is expressed as the first spacer buckle 211), as shown in FIG. Figure 8 As shown in the figure below, a plurality of spacer buckles are added in the middle of the anode plate 21 (for the convenience of description and distinction, the spacer buckles are expressed as second spacer buckles 212, and the second spacer buckles 212 are preferably round button-type spacer buckles). More specifically, as Figure 5 As shown, the first spacer buckle 211 is arranged on the side of the anode plate 21 away from the anode bottom plate 20, that is, Figure 5 The second spacer buckle 212 is arranged on the side close to the anode bottom plate 20, that is, Figure 5 The number of the first spacer buckle 211 and the second spacer buckle 212 is not particularly limited. Figure 5 and Figure 8As shown, the number of the first spacer buckles 211 of the present invention is nine (it should be noted that the anode plate 21 is a square plate, one of which is provided with seven spacers on one long side and one on each of the other two short sides), and the number of the second spacer buckles 212 is ten (divided into two rows, a row close to the anode bottom plate 20, that is, close to the periphery of the anode plate 21, is provided with seven spacers, and a row close to the cathode bottom plate 30, that is, located in the middle of the anode plate 21 or away from the periphery of the anode plate 21, is provided with three spacers, and the distribution of the second spacer buckles 212 in the row close to the periphery of the anode plate 21 is more than that in the row far from the periphery of the anode plate 21. The spacer buckles 212 are tighter. The purpose of such design is that the deformation in the middle of the anode plate 21 is smaller than that in the periphery. If a row of second spacer buckles 212 in the middle are also densely arranged, the anode area will be reduced. After optimizing the design, the applicant found that three second spacer buckles 212 in the middle of the anode plate 21 can ensure the normal operation of the electrolytic cell group. More than three will reduce the anode area, making the power consumption reduction not obvious enough. Less than three will not significantly improve the deformation of the middle position of the anode plate after welding, that is, it is impossible to ensure that the cathode and anode are spaced evenly, and thus it is impossible to ensure the smoothness of the medium operation). It should be noted that there are some structural differences between the seven first spacer buckles 211 on the long sides and the two first spacer buckles 211 on the two short sides. Specifically, Fig. 9 and Fig.10 As shown, the first spacer buckle 211 on the long side (indicated as 211a in the figure for easy distinction) and the first spacer buckle 211 on the short side (indicated as 211b in the figure for easy distinction) both have chamfers formed on the outer side surface of one end, and the difference is that the chamfer positions are different. All the second spacer buckles 212 have the same structure. More specifically, as shown in FIG. Figure 7 As shown, any second spacer buckle 212 includes a first buckle 2121 and a second buckle 2122 that can be buckled together. The first buckle 2121 includes a T-shaped first buckle body 21211 and an outer end of the first buckle body 21211, that is, Figure 7 The inverted conical buckle portion 21212 at the lower end is shown (that is, the upper end of the inverted conical buckle portion 21221 should be wide and the lower end should be narrow), and the second buckle 2122 includes an inverted T-shaped second buckle body 21221 and a buckle hole 21222 formed in the second buckle body 21221 for the inverted conical buckle portion 21212 to buckle. It should be noted that the second buckle body 21221 is axially through, that is, the second buckle body 21221 is also provided with an axial hole (not marked) that is connected to and coaxial with the buckle hole 21222, and the aperture of the buckle hole 21222 is larger than the axial hole. During installation, the inverted conical buckle portion 21212 first passes through the axial hole to be squeezed and deformed, then reaches the buckle hole 21222, and then recovers the deformation and abuts against the outer peripheral surface of the buckle hole 21222. As for the materials of the first spacer buckle 211 and the second spacer buckle 212, both are conventional polytetrafluoroethylene insulating buckles.

[0062] According to some embodiments of the present invention, the shell 11 of any electrolytic cell 10 is fixed to its corresponding sealed anode bottom plate 20 by bolts and a gasket 70 is sealed between the two, and an insulating sleeve 90 and a gasket 110 are respectively provided between the bolts and the anode bottom plate 20 and between the bolts and the shell 11 of the electrolytic cell 10. More specifically, as Figure 2 As shown, the left side is a part of the shell 11 of one of the electrolytic cells 10, and the right side is a part of the anode bottom plate 20. A gasket 70 is provided between the two. Bolts are fixed transversely between the shell 11, the anode bottom plate 20 and the gasket 70. For example, the bolts of the embodiment of the present invention are hexagonal bolts 80. Figure 2 A hexagonal nut 81 is provided at the left end portion shown, and a butterfly washer 100, a washer 110 and a T-shaped insulating sleeve 90 are respectively provided at the left and right ends between the hexagonal bolt 80 and the hexagonal nut 81, that is, between the left side of the shell 11 and the nut and between the right side of the anode bottom plate 20 and the right side end of the bolt, wherein the two insulating sleeves 90 are respectively abutted against the left end face of the shell 11 and the hole wall of the fixing hole (not marked) on the shell 11 and the right end face of the anode bottom plate 20 and the hole wall of the fixing hole (not marked) on the anode bottom plate 20.

[0063] According to some embodiments of the present invention, Figure 1 and Figure 3 As shown, the electrolytic cell 10 group of the embodiment of the present invention includes five electrolytic cells 10, and the five electrolytic cells 10 are connected and assembled into a whole along a straight line. In order to realize the electrical connection between two adjacent electrolytic cells 10, as shown in FIG. Figure 1 , Figure 3 and Figures 5 and 6 As shown, an electrical connector 60 vertically fixedly connected to the cathode bottom plate 30 and the anode bottom plate 20 of two adjacent electrolytic cells 10 is provided between the cathode bottom plate 30 and the anode bottom plate 20. For example, the electrical connector 60 of the embodiment of the present invention is an aluminum connector.

[0064] The electrolytic cell 10 of the embodiment of the present invention optimizes the spacing between the cathode and anode plates 21 to ensure smooth operation, thereby reducing the spacing between the cathode and anode plates 21, increasing the number and area of ​​the anode plates 21, reducing the cell pressure, and reducing power consumption; at the same time, the spacing buckles on the cathode and anode plates 21 are optimized and improved to make the cathode and anode spacing uniform, further reducing power consumption. It should be noted that the outer dimensions of the electrolytic cell 10 group remain unchanged and can be directly installed on the original system. According to theoretical calculations, under the operation of a total current of 112.0KA, the operating current density of the electrolytic cell 10 group of the embodiment of the present invention is 2.66KA / ㎡, and the theoretical power consumption of the electrolytic cell 10 group is 4850KWh / ton of sodium chlorate. It is 100KWh / ton of sodium chlorate lower than the electrolytic cell 10 groups in the original workshop. The guaranteed operation life of the electrolytic cell 10 group is 8 years, with an annual output of 60,000 tons, saving 6,000,000KWh per year, greatly reducing energy consumption costs.

[0065] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A chlorine-hydrochloric acid electrolytic cell group, comprising at least two electrolytic cells, wherein opposite cathode bottom plates and anode bottom plates are sealed and fixed at both ends of the shell of any of the electrolytic cells, a plurality of anode plates arranged at intervals are vertically arranged on the anode bottom plate, a plurality of cathode plates arranged at intervals are vertically arranged on the cathode bottom plate, a cathode conductive plate and an anode conductive plate are respectively arranged on the opposite sides of the cathode bottom plates and the anode bottom plates at both ends of the electrolytic cell group, and the cathode plates and the anode plates in the same electrolytic cell are arranged in parallel and staggered, characterized in that: The spacing between the cathode plate and the adjacent anode plate in the same electrolytic cell is 2.9 mm, and the area of ​​the anode plate in the electrolytic cell group is 42 m 2 .

2. The chlorine-hydrochloric acid electrolytic cell group according to claim 1, characterized in that: The flatness of any one of the cathode plate and the anode plate is ≤0.4, and the welding deformation unevenness is ≤0.5mm.

3. The chlorine-hydrochloric acid electrolytic cell group according to claim 1, characterized in that: Any of the anode plates is provided with a plurality of spacer buckles.

4. The chlorine-hydrochloric acid electrolytic cell group according to claim 3, characterized in that: The material of any of the spacer buckles is polytetrafluoroethylene.

5. The chlorine-hydrochloric acid electrolytic cell group according to claim 3, characterized in that: The spacer buckles on any of the anode plates include a plurality of first spacer buckles spaced apart on the periphery away from one side of the anode bottom plate and a plurality of second spacer buckles spaced apart near the middle position of one side of the anode bottom plate.

6. The chlorine-hydrochloric acid electrolytic cell group according to claim 5, characterized in that: The first spacer buckle is an H-shaped spacer buckle, and the second spacer buckle is a round button-shaped spacer buckle.

7. The chlorine-hydrochloric acid electrolytic cell group according to claim 6, characterized in that: The second spacer buckles include two rows, and the second spacer buckles in a row close to the periphery of the anode plate are distributed more densely than the second spacer buckles in a row far from the periphery of the anode plate.

8. The chlorine-hydrochloric acid electrolytic cell group according to claim 6, characterized in that: Any of the circular button-type spacer buckles includes a first fastener and a second fastener that can be fastened together, the first fastener includes a T-shaped first buckle body and an inverted cone buckle portion formed at the outer end of the first buckle body, and the second fastener includes an inverted T-shaped second buckle body and a button hole formed in the second buckle body for fastening with the inverted cone buckle portion.

9. The chlorine-hydrochloric acid electrolytic cell group according to claim 1, characterized in that: The shell of any electrolytic cell is fixed to its corresponding sealed anode bottom plate by bolts and a gasket is sealed between the two. Insulating sleeves and washers are respectively provided between the bolts and the anode bottom plate and between the bolts and the shell of the electrolytic cell.

10. The chlorine-hydrochloric acid electrolytic cell group according to any one of claims 1 to 9, characterized in that: At least two of the electrolytic cells are connected in a straight line and assembled into a whole, and an electrical connector perpendicular to the cathode bottom plate and the anode bottom plate of any two adjacent electrolytic cells is provided between the cathode bottom plate and the anode bottom plate.

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