Ion-exchange membrane electrolyzer for caustic soda production

Abstract

The utility model discloses a kind of ion exchange membrane electrolytic cell for caustic soda production, belong to electrolytic cell equipment technical field, including tank body, tank cover, anode assembly, cathode assembly, ion membrane and ion membrane fixed dismounting unit.Tank cover covers tank body top, ion membrane is along tank body center axis setting, the inner part of tank body is separated into anode chamber and cathode chamber, anode, cathode assembly respectively adhere to ion membrane two sides.Ion membrane fixed dismounting unit contains detachable positioning frame, rotary locking assembly and elastic compensation part;Detachable positioning frame is divided into inner frame and outer frame, ion membrane outer periphery and inner frame inner side wall are fixed, outer frame is embedded in tank cover center through-hole and is fixed, inner frame can be slidably inserted outer frame;Rotary locking assembly is located in outer frame, cooperate inner frame to realize locking fixed or unlocking separation;Elastic compensation part is located between inner frame bottom and tank body bottom wall, absorbs thermal expansion displacement.The present application realizes ion membrane quick dismounting by the sliding adaptation of inner frame and outer frame and rotary locking operation.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic cell equipment technology, and more specifically to an ion-exchange membrane electrolytic cell for caustic soda production. Background Technology

[0002] The electrolytic cell is the core equipment in the ion-exchange membrane process for producing caustic soda. It separates the anode and cathode chambers via an ion-exchange membrane, enabling the electrolysis of sodium chloride solution. Specifically, chlorine gas is generated in the anode chamber, and hydrogen gas and sodium hydroxide (caustic soda) are generated in the cathode chamber. Currently, most electrolytic cells in the industry use bolt-fixed installation for the ion-exchange membrane. This method has two drawbacks:

[0003] (1) The disassembly and assembly efficiency is low. The bolt fixing requires disassembly and installation of each component, which is cumbersome and time-consuming. Especially for large electrolytic cells, the replacement of ion membranes is time-consuming, which seriously interrupts the continuous production process of caustic soda and results in capacity loss.

[0004] (2) Thermal expansion and displacement problem: When the electrolytic cell is powered on, the electrolyte heats up and reacts with the electrodes to release heat, which will cause thermal expansion of the cell body and fixed structure. The rigid bolt fixing cannot absorb the expansion, which can easily lead to the ion membrane being squeezed and deformed or displaced. After long-term operation, the adhesion between the ion membrane and the electrode decreases, which leads to an increase in the cell voltage and an increase in electrolysis energy consumption.

[0005] In existing technologies, although there are improvements to the ion membrane fixing structure, such as the use of a combination of fixing frame, pin and protrusion, it still relies on the rigid fit between the groove and the protrusion to achieve fixing. It does not have a compensation structure for thermal expansion displacement, and the angle between the protrusion and the groove needs to be precisely aligned during disassembly and assembly. There is still room for improvement in the ease of operation. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the present invention provides an ion-exchange membrane electrolyzer for caustic soda production, so as to further improve the ease of disassembly and assembly of the ion-exchange membrane electrolyzer.

[0007] To achieve the above objectives, this utility model adopts the following technical solution:

[0008] This utility model provides an ion-exchange membrane electrolyzer for caustic soda production, including: a tank body, a tank cover, an anode assembly, a cathode assembly, an ion-exchange membrane, and an ion-exchange membrane fixing and disassembly unit;

[0009] The tank cover is fitted onto the top of the tank body, and the ion membrane is arranged along the central axis of the tank body, dividing the interior of the tank body into an anode chamber and a cathode chamber; the anode assembly and the cathode assembly are respectively attached to both sides of the ion membrane;

[0010] The ion membrane fixing and disassembly unit includes a detachable positioning frame, a rotating locking component, and an elastic compensation component; wherein, the detachable positioning frame includes an inner frame and an outer frame, the outer periphery of the ion membrane is fixedly connected to the inner sidewall of the inner frame, the outer frame is embedded in the central through hole of the tank cover and fixed to the tank cover, and the inner frame can be slidably inserted into the outer frame.

[0011] The rotating locking assembly is located on the outer frame and cooperates with the outer peripheral wall of the inner frame. The inner frame and the outer frame can be locked or unlocked by rotating the assembly.

[0012] The elastic compensation component is located between the bottom of the inner frame and the bottom wall of the tank, and is used to absorb the thermal expansion displacement during the operation of the electrolytic cell.

[0013] Preferably, the anode chamber has an anode inlet at the bottom, an anode outlet at the upper part of the side wall, and an anode vent at the top; the cathode chamber has a cathode inlet at the bottom, a cathode outlet at the upper part of the side wall, and a cathode vent at the top.

[0014] Preferably, the rotary locking assembly includes a knob, a pivot, and a latch; wherein the knob is located on the top outer side of the outer frame, one end of the pivot is fixed to the knob and the other end passes through the side wall of the outer frame, and the latch is fixed to the end of the pivot away from the knob;

[0015] The outer peripheral wall of the inner frame is provided with a slot that matches the locking tongue. Rotating the knob can drive the locking tongue to engage or disengage from the slot.

[0016] Preferably, the outer peripheral wall of the inner frame is provided with a limiting flange along the height direction, and the inner peripheral wall of the outer frame is provided with a corresponding limiting step. The limiting flange and the limiting step are adapted to limit the maximum depth of the inner frame inserted into the outer frame.

[0017] Preferably, at least two sets of the rotating locking assembly are evenly spaced along the top of the outer frame; the slot is an annular slot, and the width of the slot is greater than the thickness of the locking tongue. When the locking tongue is engaged in the slot, a thermal expansion gap is reserved between the locking tongue and the slot wall.

[0018] Preferably, the elastic compensation component is a wave spring, wherein the top of the wave spring abuts against the bottom of the inner frame and the bottom is fixed to the bottom wall of the groove.

[0019] The inner sidewall of the outer frame is also fitted with an elastic sealing gasket, which is tightly fitted to the outer peripheral wall of the inner frame.

[0020] Preferably, the anode assembly includes an anode base mesh and an anode coating, wherein the anode base mesh is a titanium mesh, the anode coating is a ruthenium-iridium composite coating, and the anode coating faces the ion exchange membrane and is bonded to the ion exchange membrane.

[0021] Preferably, the cathode assembly includes a cathode base mesh, an elastic conductive pad, and a cathode coating stacked sequentially. The cathode base mesh is a nickel mesh, the elastic conductive pad is a nickel alloy woven mesh, and the cathode coating is a nickel-cobalt alloy coating. The cathode coating faces the ion exchange membrane and is bonded to the ion exchange membrane.

[0022] Preferably, the end of the latch away from the pivot is provided with an elastic locking protrusion, and the bottom of the slot is provided with a corresponding positioning recess. When the latch is engaged in the slot, the elastic locking protrusion is embedded in the positioning recess.

[0023] In summary, this utility model has the following beneficial effects:

[0024] This utility model provides an ion-exchange membrane electrolyzer for caustic soda production. The inner frame holds the ion-exchange membrane and can be slidably inserted into the outer frame. A rotating locking component engages with the outer wall of the inner frame, allowing for locking or unlocking of the inner and outer frames with a simple rotation operation. This eliminates the tedious steps of disassembling and assembling components one by one using traditional bolts. The sliding fit between the inner and outer frames and the convenient operation of the rotating locking mechanism enable rapid assembly and disassembly of the ion-exchange membrane. Simultaneously, the elastic compensation component between the bottom of the inner frame and the tank body absorbs displacement caused by thermal expansion. The sliding fit between the inner and outer frames allows relative movement, preventing deformation of the ion-exchange membrane caused by rigid fixing. This effectively overcomes the displacement problem of the ion-exchange membrane due to thermal expansion, ensuring the fit between the ion-exchange membrane and the components on both sides, stabilizing the electrolyzer voltage, and improving caustic soda production efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an ion-exchange membrane electrolyzer for caustic soda production according to this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the ion membrane fixing and disassembly unit of this utility model;

[0027] Figure 3 This is a schematic diagram of the outer frame structure of this utility model;

[0028] Figure 4 This is a schematic diagram of the rotary locking assembly structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the inner frame structure of this utility model;

[0030] Figure 6 This is a schematic diagram of the outer frame structure of the present invention with limiting steps;

[0031] Figure 7 This is a side view of the inner frame of this utility model with a limiting flange;

[0032] Figure 8 This is a schematic diagram of the structure of the anode assembly of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the cathode assembly of this utility model.

[0034] Reference numerals: 1-Tank body; 2-Tank cover; 3-Anode assembly; 31-Anode chamber; 32-Anode inlet; 33-Anode outlet; 34-Anode vent; 35-Anode base mesh; 36-Anode coating; 4-Cathode assembly; 41-Cathode chamber; 42-Cathode inlet; 43-Cathode outlet; 44-Cathode vent; 45-Cathode base mesh; 46-Elastic conductive gasket; 47-Cathode coating; 5-Ion membrane; 6-Elastic compensation component; 71-Inner frame; 711-Slot; 712-Limiting flange; 72-Outer frame; 721-Limiting step; 722-Elastic sealing gasket; 81-Knob; 82-Rotating shaft; 83-Lock tongue. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] To make the objectives, solutions, and advantages of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0037] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0038] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0039] The following is in conjunction with the appendix of this utility model. Figures 1-9 The embodiments of this utility model will be described in detail below.

[0040] Example 1:

[0041] Reference Figure 1 and 2As shown, this embodiment provides an ion-exchange membrane electrolyzer for caustic soda production, including a tank body 1, a tank cover 2, an anode assembly 3, a cathode assembly 4, an ion-exchange membrane 5, and an ion-exchange membrane fixing and disassembly unit.

[0042] The tank cover 2 covers the top of the tank body 1, and the ion membrane 5 is set along the central axis of the tank body 1, dividing the interior of the tank body 1 into an anode chamber 31 and a cathode chamber 41; the anode assembly 3 and the cathode assembly 4 are respectively attached to both sides of the ion membrane 5.

[0043] The ion membrane fixing and disassembly unit includes a detachable positioning frame, a rotating locking assembly, and an elastic compensation component 6; wherein, the detachable positioning frame includes an inner frame 71 and an outer frame 72, the outer periphery of the ion membrane 5 is fixedly connected to the inner sidewall of the inner frame 71, the outer frame 72 is embedded in the central through hole of the tank cover 2 and fixed to the tank cover 2, and the inner frame 71 can be slidably inserted into the outer frame 72.

[0044] Reference Figure 3 As shown, the rotating locking assembly is located on the outer frame 72 and cooperates with the outer peripheral wall of the inner frame 71. By rotating, the inner frame 71 and the outer frame 72 can be locked or unlocked.

[0045] The elastic compensation component 6 is located between the bottom of the inner frame 71 and the bottom wall of the tank 1, and is used to absorb the thermal expansion displacement during the operation of the electrolytic cell.

[0046] The anode chamber 31 has an anode inlet 32 ​​at its bottom, an anode outlet 33 on its upper side wall, and an anode gas outlet 34 at its top. The anode inlet 32 ​​is used to input brine, the anode outlet 33 is used to discharge the brine solution from the upper part of the anode chamber 31 after electrolysis, and the anode gas outlet 34 is used to discharge chlorine gas generated during electrolysis. The cathode chamber 41 has a cathode inlet 42 at its bottom, a cathode outlet 43 on its upper side wall, and a cathode gas outlet 44 at its top. The cathode inlet 42 is used to input pure water, the cathode outlet 43 is used to discharge the caustic soda solution from the upper part of the cathode chamber 41 after electrolysis, and the cathode gas outlet 44 is used to discharge hydrogen gas generated during electrolysis.

[0047] In this embodiment, the inner frame 71 fixes the ion membrane 5 and can be slidably inserted into the outer frame 72. The rotation locking component cooperates with the outer peripheral wall of the inner frame 71. Only a rotation operation is needed to complete the locking or unlocking of the inner frame 71 and the outer frame 72, eliminating the tedious steps of disassembling and assembling each component with traditional bolts. With the sliding fit between the inner frame 71 and the outer frame 72 and the convenient operation of the rotation locking, the ion membrane 5 can be quickly disassembled and assembled, improving the convenience of quick disassembly and assembly of the ion membrane 5 in the electrolyzer.

[0048] Meanwhile, the elastic compensation component 6 between the bottom of the inner frame 71 and the tank 1 can absorb the displacement caused by thermal expansion. The sliding fit between the inner frame 71 and the outer frame 72 allows them to move relative to each other, avoiding the deformation of the ion membrane 5 caused by rigid fixing. This effectively overcomes the displacement problem of the ion membrane 5 caused by thermal expansion, ensuring the fit between the ion membrane 5 and the components on both sides (i.e., the cathode component 4 and the anode component 3), thereby stabilizing the voltage of the electrolytic cell and improving the caustic soda production rate.

[0049] Specifically, the inner wall of the inner frame 71 is sealed and fixed to the outer periphery of the ion exchange membrane 5 with epoxy resin. The purpose of this fixing method is to ensure that the ion exchange membrane 5 is flat and wrinkle-free, because wrinkles will cause uneven adhesion between the electrode and the membrane, resulting in excessively high local current density. At the same time, the sealed connection can prevent the electrolytes in the anode chamber 31 and the cathode chamber 41 from mixing. The inner frame 71 can be slidably inserted into the outer frame 72, which can provide room for thermal expansion and displacement, avoiding the deformation of the ion exchange membrane 5 caused by rigid fixing.

[0050] In this embodiment, refer to Figure 3 and Figure 4 As shown, the rotary locking assembly includes a knob 81, a rotating shaft 82, and a locking tongue 83; wherein, the knob 81 is located on the top outer side of the outer frame 72, one end of the rotating shaft 82 is fixed to the knob 81, and the other end passes through the side wall of the outer frame 72, and the locking tongue 83 is fixed to the end of the rotating shaft 82 away from the knob 81. (Refer to...) Figure 5 As shown, the outer peripheral wall of the inner frame 71 is provided with a slot 711 that is adapted to the locking tongue 83. Rotating the knob 81 can drive the locking tongue 83 to engage or disengage from the slot 711, thereby achieving locking and unlocking of the inner frame 71.

[0051] Furthermore, to prevent the inner frame 71 from being excessively inserted into the outer frame 72, the compression of the elastic compensation member 6 at its bottom is reduced, such as... Figure 6 and Figure 7 As shown, in this embodiment, a limiting flange 712 is provided on the outer peripheral wall of the inner frame 71 along the height direction, and a limiting step 721 is provided on the inner peripheral wall of the outer frame 72. The limiting flange 712 and the limiting step 721 are adapted to limit the maximum depth of the inner frame 71 inserted into the outer frame 72.

[0052] In this embodiment, to ensure balanced force on the inner frame 71 and avoid tilting caused by unilateral force, at least two sets of rotating locking components are evenly spaced along the top of the outer frame 72. The slot 711 is an annular slot, and the width of the slot 711 is greater than the thickness of the locking tongue 83. When the locking tongue 83 is engaged in the slot 711, a thermal expansion gap is reserved between the locking tongue 83 and the slot wall of the slot 711. The purpose of this gap is to provide space for the thermal expansion of the inner frame 71 and to prevent the locking tongue 83 from jamming with the slot 711 due to thermal expansion of the inner frame 71 during electrolysis (because jamming will prevent subsequent unlocking and affect the replacement of the ion membrane 5).

[0053] In this embodiment, the elastic compensation component 6 is a wave spring, with the top of the wave spring abutting against the bottom of the inner frame 71 and the bottom fixed to the bottom wall of the groove 1.

[0054] Specifically, the elastic compensation component 6 can be a stainless steel wave spring, the purpose of which is to absorb the thermal expansion displacement during the electrolysis process. Its specific function is as follows: When the electrolytic cell is working, the electrolyte temperature rises to 85-90℃, and the tank body 1, inner frame 71 and outer frame 72 will have axial displacement due to thermal expansion and contraction. The wave spring can absorb this displacement through its own compression / extension, avoiding rigid compression between the inner frame 71 and the outer frame 72, thereby preventing the ion membrane 5 from deforming or displacing.

[0055] The pre-compression of the wave spring is set to 2-3 mm. The purpose of this pre-compression design is to ensure that the inner frame 71 is always supported by an upward force, so that the ion membrane 5 is in close contact with the anode assembly 3 and the cathode assembly 4, avoiding the increase in cell voltage caused by the increase in the contact gap, thereby stabilizing the electrolysis energy consumption and caustic soda production rate.

[0056] In addition, such as Figure 3 and Figure 4 As shown, to improve the sealing between the inner frame 71 and the outer frame 72, an elastic sealing gasket 722 is attached to the inner wall of the outer frame 72, and the elastic sealing gasket 722 is tightly fitted to the outer peripheral wall of the inner frame 71. The elastic sealing gasket 722 can be a 2mm thick fluororubber elastic sealing gasket. Fluororubber has a certain elasticity and can deform as the inner frame 71 moves. Therefore, the function of this sealing gasket is to fill the gap between the inner frame 71 and the outer frame 72, ensuring the sealing of the two chambers and preventing electrolyte leakage, without affecting the axial sliding of the inner frame 71.

[0057] Based on the electrolyzer structure of the above embodiments, the assembly, operation, and disassembly / reassembly process of the ion-exchange membrane electrolyzer for caustic soda production in this embodiment is as follows:

[0058] 1. Assembly process:

[0059] Step 1: Fix the bottom of the elastic compensation component 6 to the center of the bottom wall of the groove 1 with bolts;

[0060] Step 2: Seal and fix the outer periphery of the ion exchange membrane 5 to the inner wall of the inner frame 71 with epoxy resin adhesive to ensure that the ion exchange membrane 5 is flat and wrinkle-free.

[0061] Step 3: Insert the inner frame 71 from the top of the outer frame 72 of the slot cover 2 until the limiting flange 712 of the inner frame 71 abuts against the limiting step 721 of the outer frame 72. At this time, the bottom of the inner frame 71 abuts against the top of the elastic compensation member 6.

[0062] Step 4: Rotate the knob 81 to drive the shaft 82 to rotate the locking tongue 83, so that the locking tongue 83 is engaged in the slot 711 of the inner frame 71 until the elastic protrusion is embedded in the positioning recess, thus completing the fixation of the ion membrane 5.

[0063] Step 5: Install the anode assembly 3 and the cathode assembly 4 into the anode chamber 31 and the cathode chamber 41 respectively, ensuring that the anode coating 36, the cathode coating 47 and the ion membrane 5 are tightly bonded;

[0064] Step 6: Secure the groove cover 2 to the top of the groove body 1 with bolts to complete the overall assembly.

[0065] 2. Work process:

[0066] Liquid inlet: A purified NaCl saturated solution is introduced into the anode chamber 31 through the anode inlet 32, and pure water is introduced into the cathode chamber 41 through the cathode inlet 42.

[0067] Electrolysis: Direct current is applied to the anode assembly 3 and the cathode assembly 4. During this process: Chloride ions in the anode chamber 31 lose electrons on the surface of the anode assembly 3 to generate chlorine gas, which is discharged through the anode outlet 34. The resulting dilute brine is discharged through the anode outlet 33. Pure water in the cathode chamber 41 gains electrons on the surface of the cathode coating 47 to generate hydrogen gas and hydroxide ions (OH⁻). The hydrogen gas is discharged through the cathode outlet 44. Na⁺ migrates through the ion-exchange membrane 5 to the cathode chamber 41 and combines with hydroxide ions (OH⁻) to generate NaOH (caustic soda). When the NaOH concentration in the cathode chamber 41 reaches a preset concentration, the caustic soda solution is discharged through the cathode outlet 43.

[0068] Thermal expansion compensation: During electrolysis, the electrolyte temperature rises to 85-90℃, causing thermal expansion between the tank body 1 and the inner frame 71. At this time, the elastic compensation component 6 is further compressed, absorbing the axial displacement of the inner frame 71. Simultaneously, the elastic sealing gasket 722 can also absorb the radial displacement caused by the expansion of the inner frame 71. The reserved gap between the locking tongue 83 and the slot 711 prevents the locking tongue 83 from jamming, ensuring that the ion membrane 5 is always in contact with the electrode, and the tank voltage remains stable at the preset working voltage.

[0069] 3. Ion exchange membrane assembly and disassembly procedures:

[0070] Disassembly: Turn off the liquid inlet and power supply system, open the tank cover 2, rotate the knob 81 to disengage the locking tongue 83 from the slot 711, pull the inner frame 71 out from the top of the outer frame 72, and the old ion membrane 5 can be removed.

[0071] Installation: Fix the new ion exchange membrane 5 to the inside of the new inner frame 71, and repeat the assembly steps 3 and 4 to complete the replacement of the ion exchange membrane 5.

[0072] The ion-exchange membrane electrolyzer for caustic soda production provided in this embodiment has the following technical advantages: significantly improved disassembly and assembly efficiency: the rotary locking component replaces the traditional bolt fixing, shortening the disassembly and assembly time of the ion-exchange membrane 5, reducing production interruption time, and ensuring continuous caustic soda production capacity; the thermal expansion problem is completely solved: the dual compensation design of the wave spring (elastic compensation component 6) and the thermal expansion gap (between the locking tongue 83 and the slot 711) avoids deformation or displacement of the ion-exchange membrane 5, stabilizes the cell voltage, and reduces the power consumption of the electrolyzer.

[0073] Example 2:

[0074] In this embodiment, further improvements are made based on Embodiment 1 described above. (Refer to...) Figure 8 As shown, this embodiment provides an anode assembly 3 including an anode base mesh 35 and an anode coating 36. The anode base mesh 35 is a titanium mesh, and the anode coating 36 is a ruthenium-iridium composite coating, with the anode coating 36 facing and bonded to the ion exchange membrane 5. The anode base mesh 35 is made of titanium, which possesses excellent resistance to chlorine corrosion, preventing the anode assembly 3 from being oxidized by chlorine generated during electrolysis. Simultaneously, the mesh structure increases the electrolyte flow area, reduces electrolyte flow resistance, and provides a stable support for the anode coating 36. The anode coating 36 specifically employs a ruthenium-iridium composite coating. The ruthenium-iridium alloy exhibits high chlorine evolution catalytic activity, reducing the overpotential of chloride ion discharge, and also possesses high chemical stability, making it resistant to peeling over long-term use. (Refer to...) Figure 9As shown, the cathode assembly 4 in this embodiment includes a cathode base mesh 45, an elastic conductive pad 46, and a cathode coating 47 stacked sequentially. The cathode base mesh 45 is a nickel mesh, the elastic conductive pad 46 is a nickel alloy woven mesh, and the cathode coating 47 is a nickel-cobalt alloy coating. The cathode coating 47 faces the ion exchange membrane 5 and is bonded to the ion exchange membrane 5. The cathode base mesh 45 is made of nickel mesh. Nickel has good resistance to caustic soda corrosion, preventing the cathode assembly 4 from being corroded by NaOH solution. It also has excellent conductivity, reducing current transmission loss. The elastic conductive pad 46 is made of nickel alloy woven mesh. Its design purpose is to compensate for the bonding gap between the electrode and the ion exchange membrane 5. Its elastic deformation ensures a tight bond between the cathode coating 47 and the ion exchange membrane 5. The nickel alloy material also ensures good conductivity, preventing the pad from introducing additional resistance. The cathode coating 47 is a nickel-cobalt alloy coating. Nickel-cobalt alloy has high hydrogen evolution catalytic activity, reducing the overpotential of hydrogen generation during pure water discharge and reducing the energy consumption of the cathode reaction. In this embodiment, to prevent the knob 81 from rotating unexpectedly due to electrolytic cell vibration (such as vibration from workshop equipment operation) and to ensure stable locking, an elastic locking protrusion is provided at the end of the locking tongue 83 away from the rotating shaft 82. A corresponding positioning recess is provided at the bottom of the slot 711. When the locking tongue 83 is engaged in the slot 711, the elastic locking protrusion embeds into the positioning recess, ensuring that the locking tongue 83 will not unlock or loosen due to equipment vibration. This embodiment utilizes the elastic conductive gasket 46 to ensure the adhesion between the coating (anode coating 36, cathode coating 47) and the ion membrane 5. Simultaneously, the design of the elastic sealing gasket 722 and the elastic locking protrusion ensures system sealing and locking stability, making it suitable for long-term continuous production.

[0075] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An ion-exchange membrane electrolyzer for caustic soda production, characterized in that, include: Tank body (1), tank cover (2), anode assembly (3), cathode assembly (4), ion membrane (5), and ion membrane fixing and disassembly unit; The tank cover (2) covers the top of the tank body (1), and the ion membrane (5) is arranged along the central axis of the tank body (1), dividing the interior of the tank body (1) into an anode chamber (31) and a cathode chamber (41); the anode assembly (3) and the cathode assembly (4) are respectively attached to both sides of the ion membrane (5); The ion membrane fixing and disassembly unit includes a detachable positioning frame, a rotating locking component and an elastic compensation component (6); wherein, the detachable positioning frame includes an inner frame (71) and an outer frame (72), the outer periphery of the ion membrane (5) is fixedly connected to the inner sidewall of the inner frame (71), the outer frame (72) is embedded in the central through hole of the slot cover (2) and fixed to the slot cover (2), and the inner frame (71) can be slidably inserted into the outer frame (72); The rotating locking assembly is located on the outer frame (72) and cooperates with the outer peripheral wall of the inner frame (71). Through rotation, the inner frame (71) and the outer frame (72) can be locked or unlocked. The elastic compensation member (6) is located between the bottom of the inner frame (71) and the bottom wall of the tank (1) to absorb the thermal expansion displacement during the operation of the electrolytic cell.

2. The ion-exchange membrane electrolyzer for caustic soda production according to claim 1, characterized in that, The bottom of the anode chamber (31) is provided with an anode inlet (32), the upper part of the side wall of the anode chamber (31) is provided with an anode outlet (33), and the top of the anode chamber (31) is provided with an anode vent (34); the bottom of the cathode chamber (41) is provided with a cathode inlet (42), the upper part of the side wall of the cathode chamber (41) is provided with a cathode outlet (43), and the top of the cathode chamber (41) is provided with a cathode vent (44).

3. The ion-exchange membrane electrolyzer for caustic soda production according to claim 1, characterized in that, The rotating locking assembly includes a knob (81), a pivot (82), and a latch (83); wherein the knob (81) is located on the top outer side of the outer frame (72), one end of the pivot (82) is fixed to the knob (81), and the other end passes through the side wall of the outer frame (72), and the latch (83) is fixed to the end of the pivot (82) away from the knob (81); The outer peripheral wall of the inner frame (71) is provided with a slot (711) that is adapted to the locking tongue (83). Rotating the knob (81) can drive the locking tongue (83) to engage or disengage from the slot (711).

4. The ion-exchange membrane electrolyzer for caustic soda production according to claim 3, characterized in that, The outer peripheral wall of the inner frame (71) is provided with a limiting flange (712) along the height direction, and the inner peripheral wall of the outer frame (72) is provided with a corresponding limiting step (721). The limiting flange (712) and the limiting step (721) are adapted to limit the maximum depth of the inner frame (71) inserted into the outer frame (72).

5. The ion-exchange membrane electrolyzer for caustic soda production according to claim 3, characterized in that, The rotating locking assembly is provided with at least two sets evenly spaced along the top of the outer frame (72); the slot (711) is an annular slot, and the width of the slot (711) is greater than the thickness of the locking tongue (83). When the locking tongue (83) is inserted into the slot (711), a thermal expansion gap is reserved between the locking tongue (83) and the slot wall of the slot (711).

6. The ion-exchange membrane electrolyzer for caustic soda production according to claim 1, characterized in that, The elastic compensation component (6) is a wave spring. The top of the wave spring abuts against the bottom of the inner frame (71) and the bottom is fixed to the bottom wall of the groove (1). An elastic sealing gasket (722) is also attached to the inner side wall of the outer frame (72). The elastic sealing gasket (722) is tightly attached to the outer peripheral wall of the inner frame (71).

7. The ion-exchange membrane electrolyzer for caustic soda production according to claim 1, characterized in that, The anode assembly (3) includes an anode base mesh (35) and an anode coating (36). The anode base mesh (35) is a titanium mesh, and the anode coating (36) is a ruthenium-iridium composite coating. The anode coating (36) faces the ion membrane (5) and is attached to the ion membrane (5).

8. The ion-exchange membrane electrolyzer for caustic soda production according to claim 1, characterized in that, The cathode assembly (4) includes a cathode base mesh (45), an elastic conductive pad (46), and a cathode coating (47) stacked in sequence. The cathode base mesh (45) is a nickel mesh, the elastic conductive pad (46) is a nickel alloy woven mesh, and the cathode coating (47) is a nickel-cobalt alloy coating. The cathode coating (47) faces the ion membrane (5) and is attached to the ion membrane (5).

9. The ion-exchange membrane electrolyzer for caustic soda production according to claim 4, characterized in that, The end of the latch (83) away from the pivot (82) is provided with an elastic locking protrusion, and the bottom of the slot (711) is provided with a corresponding positioning recess. When the latch (83) is engaged in the slot (711), the elastic locking protrusion is embedded in the positioning recess.

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