Chlorine pressure balance control device for electrolytic bath outlet of ionic membrane caustic soda device

Abstract

The utility model relates to the technical field related to caustic soda production, in particular to a chlorine pressure balance control device for an electrolytic bath outlet of an ionic membrane caustic soda device, which is arranged on an electrolytic bath, and a safety cover communicated with the inner side of the electrolytic bath is arranged on the electrolytic bath; comprising a pressure balance mechanism, and the pressure balance mechanism comprises a pressure tank which is fixedly installed on the safety cover and communicates with the inner side of the safety cover and an elastic extrusion piece arranged in the pressure tank; the safety device comprises a safety cover and an elastic extrusion part arranged on the safety cover, and further comprises a trigger mechanism arranged on the safety cover, and when the pressure intensity of gas in the safety cover exceeds a threshold value, the elastic extrusion part extrudes the trigger mechanism so as to drive the trigger mechanism to burst instant acting force to an opening and closing part arranged on the safety cover. Effective release of chlorine in the electrolytic bath can be ensured, the problem of chlorine retention caused by too high pressure is prevented, and meanwhile, the ionic membrane is prevented from being mechanically damaged.

Description

Technical Field

[0001] This utility model relates to the technical field of caustic soda production, specifically a chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit. Background Technology

[0002] The ion-exchange membrane caustic soda electrolyzer is an important piece of equipment in the chlor-alkali industry, used to produce high-purity caustic soda (sodium hydroxide) and chlorine gas. The working principle of the ion-exchange membrane caustic soda electrolyzer is to produce high-purity sodium hydroxide (NaOH), chlorine gas (Cl2), and hydrogen gas (H2) by electrolyzing brine (NaCl solution). Its core lies in using a cation exchange membrane (ion-exchange membrane) to separate the anode and cathode chambers of the electrolyzer, thereby achieving a highly efficient electrolysis process.

[0003] The ion-exchange membrane is a core component of the electrolyzer, and its performance directly affects the electrolyzer's operating efficiency and safety. The pressure difference between chlorine and hydrogen has a significant impact on the ion-exchange membrane. If the chlorine pressure is too high, the ion-exchange membrane may adhere tightly to the anode side, causing localized damage or even rupture; while if the chlorine pressure is too low, it may cause permanent damage to the reinforcing fluoroplastic mesh and the ion-exchange membrane release layer, while also increasing voltage and contaminating the cathode coating. Therefore, maintaining stable chlorine pressure and an appropriate pressure difference is crucial for protecting the ion-exchange membrane.

[0004] Existing electrolytic cell outlet chlorine pressure balance control devices typically monitor the chlorine outlet pressure using a chlorine pressure transmitter and calculate and display the over-temperature value together with a chlorine temperature thermocouple. When the over-temperature value reaches the set value, the pressure reducing valve is closed. When the chlorine pressure reaches the threshold, a command is sent to the pressure control valve. During the time the signal is sent and the pressure control valve is in operation, the chlorine pressure at the electrolytic cell outlet always exceeds the set value, causing some chlorine to remain, which may damage the ion exchange membrane. Utility Model Content

[0005] The purpose of this invention is to provide a chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda plant, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A chlorine gas pressure balance control device at the outlet of an electrolytic cell in an ion-exchange membrane caustic soda unit is installed on the electrolytic cell, and a safety cover communicating with the inner side of the electrolytic cell is installed on the electrolytic cell.

[0008] The pressure balancing mechanism includes a pressure tank fixedly installed on the safety cover and communicating with the inside of the safety cover, and an elastic compression member disposed inside the pressure tank.

[0009] It also includes a triggering mechanism disposed on the safety cover. When the gas pressure inside the safety cover exceeds a threshold, the elastic extrusion member squeezes the triggering mechanism to drive the triggering mechanism to release an instantaneous force on the opening and closing member disposed on the safety cover.

[0010] The chlorine pressure balance control device at the outlet of the electrolytic cell of the ion-exchange membrane caustic soda unit as described above: the elastic extrusion member includes a piston that is slidably and sealed to the inside of the pressure tank, and a movable shaft is provided along the axial direction of the piston;

[0011] It also includes a pressing disc, which is arranged along the axial direction of the pressure tank and slidably connected to the inner wall of the pressure tank. A first spring is connected between the pressing disc and the piston, with one end of the first spring abutting against the piston and the other end abutting against the pressing disc.

[0012] The chlorine pressure balance control device at the outlet of the electrolytic cell of the ion-exchange membrane caustic soda unit, as described above, wherein the movement of the extrusion disc on the inner wall of the pressure tank is controlled by at least one set of adjusting components provided on the pressure tank.

[0013] The chlorine pressure balance control device at the outlet of the electrolytic cell of the ion-exchange membrane caustic soda unit as described above: the adjustment component includes a lead screw rotatably mounted on the pressure tank, and a threaded sleeve that is fixed to the extrusion plate is threadedly connected to the lead screw.

[0014] The chlorine pressure balance control device at the outlet of the electrolytic cell of the ion-exchange membrane caustic soda unit as described above: a first push rod and a second push rod are provided on the end of the piston that passes through the pressure tank and extends out of the pressure tank, and abut against the triggering mechanism.

[0015] The chlorine pressure balance control device at the outlet of the electrolytic cell of the ion-exchange membrane caustic soda unit as described above: the triggering mechanism includes a support plate fixedly installed on the safety cover, a deflection rod that can abut against the first push rod or the second push rod is hinged to one end of the support plate, and a limiting block that limits the deflection rod is symmetrically arranged on the support plate.

[0016] It also includes a second spring, one end of which is hinged to the support plate and the other end of which is hinged to the deflection rod.

[0017] The chlorine pressure balance control device at the outlet of the electrolytic cell in the ion-exchange membrane caustic soda unit as described above: the opening and closing component includes a control plate fixedly installed on the safety cover, and the control plate is equipped with a switch that can control the operation of the electrolytic cell.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] When the chlorine pressure in the safety chamber increases, the elastic extrusion component deforms to drive the trigger mechanism to deflect. At this time, the elastic potential energy stored in the trigger mechanism increases. Once the chlorine pressure in the chamber exceeds the threshold, the trigger mechanism deforms and instantly acts on the opening and closing component, thereby quickly cutting off the power supply to the electrolytic cell. This slows down the chemical reaction in the electrolytic cell, thereby rapidly reducing the generation of chlorine. By rapidly balancing and controlling the chlorine pressure, it is possible to ensure that chlorine is released quickly and effectively in the electrolytic cell, preventing chlorine retention caused by excessive pressure, and avoiding mechanical damage to the ion exchange membrane. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit.

[0021] Figure 2 This is a schematic diagram of the electrolytic cell and safety cover in the chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit.

[0022] Figure 3 This is a schematic diagram of the safety cover and pressure tank in the chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit.

[0023] Figure 4 This is a schematic diagram of the pressure balancing mechanism and triggering mechanism in the chlorine pressure balancing control device at the outlet of the electrolytic cell of an ion-exchange membrane caustic soda unit.

[0024] Figure 5 This is a schematic diagram of the internal structure of the pressure tank in the chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit.

[0025] Figure 6 This is a schematic diagram of the elastic extrusion component and triggering mechanism in the chlorine pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit.

[0026] In the diagram: 1. Electrolytic cell; 101. Anode outlet; 102. Cathode outlet; 2. Safety cover; 3. Pressure tank; 301. First chute; 302. Second chute; 303. Limiting ring; 4. Guide tube; 5. Connecting clamp; 6. Piston; 601. First slider; 7. Movable shaft; 701. First push rod; 702. Second push rod; 8. First spring; 9. Extrusion plate; 901. Second slider; 10. Lead screw; 11. Threaded sleeve; 12. Control board; 13. Switch; 14. Support plate; 1401. Limiting block; 15. Deflection rod; 16. Second spring. Detailed Implementation

[0027] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0028] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0029] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0030] Please see Figures 1-6 In this embodiment of the utility model, a chlorine pressure balance control device at the outlet of an ion-exchange membrane caustic soda electrolyzer is installed on an electrolyzer 1, and a safety cover 2 communicating with the inner side is installed on the electrolyzer 1.

[0031] The pressure balancing mechanism includes a pressure tank 3 fixedly installed on the safety cover 2 and communicating with the inside of the safety cover 2, and an elastic compression member disposed in the pressure tank 3.

[0032] It also includes a triggering mechanism disposed on the safety cover 2. When the gas pressure inside the safety cover 2 exceeds a threshold, the elastic extrusion member squeezes the triggering mechanism to drive the triggering mechanism to release an instantaneous force on the opening and closing member disposed on the safety cover 2.

[0033] Preferably, the pressure tank 3 is connected to the inner side of the safety cover 2 via the conduit 4.

[0034] It should be noted that the electrolytic cell 1 is provided with an anode outlet 101 and a cathode outlet 102 that are connected to the inner side, and the gas flows into two independent spaces formed inside the safety cover 2 before being discharged outward.

[0035] In detail, when the chlorine pressure in the chamber connected to the anode outlet 101 inside the safety cover 2 increases, the elastic extrusion member deforms to drive the triggering mechanism to deflect. At this time, the elastic potential energy stored in the triggering mechanism increases. Once the chlorine pressure in the chamber exceeds the threshold, the triggering mechanism deforms and instantly acts on the opening and closing member, thereby quickly cutting off the power supply to the electrolytic cell 1, slowing down the chemical reaction in the electrolytic cell 1, and rapidly reducing the generation of chlorine. By quickly balancing and controlling the chlorine pressure, the effective release of chlorine in the safety cover 2 can be ensured, avoiding the problem of chlorine retention due to excessive pressure, and at the same time avoiding mechanical damage to the ion membrane.

[0036] For further solutions to this utility model, please refer to [link / reference]. Figure 5 and Figure 6 The elastic extrusion member includes a piston 6 that is slidably and sealingly connected to the inside of the pressure tank 3, and a movable shaft 7 is provided along the axial direction of the piston 6;

[0037] It also includes a pressing disc 9, which is arranged along the axial direction of the pressure tank 3 and is slidably connected to the inner wall of the pressure tank 3. A first spring 8 is connected between the pressing disc 9 and the piston 6. One end of the first spring 8 abuts against the piston 6 and the other end abuts against the pressing disc 9.

[0038] Preferably, the safety cover 2 is fixedly installed with multiple connecting clamps 5 for securing the pressure tank 3.

[0039] Preferably, a limiting ring 303 with an annular structure is formed inside the pressure tank 3 and is fixed to the inner wall of the pressure tank 3.

[0040] In the initial state, the first spring 8 is in a compressed state, allowing the pressure in the electrolytic cell 1 to change within a certain range. When the chlorine pressure in the chamber of the safety cover 2 is greater than the elastic potential energy stored in the first spring 8, the piston 6 moves linearly along the axis of the pressure tank 3 and drives the movable shaft 7 to move synchronously. At this time, the first spring 8 is further compressed, and the movable shaft 7 squeezes the triggering mechanism when it moves, so as to meet the requirements of the triggering mechanism to work.

[0041] Preferably, at least one set of first sliding grooves 301 are formed inside the pressure tank 3, and a first slider 601 adapted to the first sliding grooves 301 is provided on the piston 6. Under the limiting effect of the first sliding grooves 301 and the first slider 601, the piston 6 and the inner wall of the pressure tank 3 are slidably connected.

[0042] For further solutions to this utility model, please refer to [link / reference]. Figure 6 The movement of the extrusion disc 9 on the inner wall of the pressure tank 3 is controlled by at least one set of adjusting components disposed on the pressure tank 3.

[0043] The adjusting assembly includes a lead screw 10 rotatably mounted on the pressure tank 3, and a threaded sleeve 11 that is fixed to the extrusion plate 9 is threadedly connected to the lead screw 10.

[0044] Preferably, the inner wall of the pressure tank 3 is provided with at least one set of second sliding grooves 302, and the extrusion plate 9 is provided with a second slider 901 that is slidably adapted to the second sliding grooves 302. Under the limiting effect of the second sliding grooves 302 and the second slider 901, the extrusion plate 9 and the inner wall of the pressure tank 3 are slidably connected, and the threaded sleeve 11 is prevented from rotating synchronously with the rotation of the lead screw 10.

[0045] By manually rotating the lead screw 10, the threaded sleeve 11 can be driven to move linearly along the axis of the lead screw 10, thereby changing the position of the extrusion disc 9 in the pressure tank 3. This allows adjustment of the compression amount of the first spring 8, enabling the change of chlorine pressure differential in different scenarios.

[0046] Preferably, the piston 6 has a first push rod 701 and a second push rod 702 on one end that passes through the pressure tank 3 and extends out of the pressure tank 3, which abut against the triggering mechanism.

[0047] For further solutions to this utility model, please refer to [link / reference]. Figure 4 and Figure 6 The triggering mechanism includes a support plate 14 fixedly installed on the safety cover 2. One end of the support plate 14 is hinged with a deflection rod 15 that can abut against the first push rod 701 or the second push rod 702. The support plate 14 is symmetrically provided with limiting blocks 1401 for limiting the deflection rod 15.

[0048] It also includes a second spring 16, one end of which is hinged to the support plate 14 and the other end of which is hinged to the deflection rod 15.

[0049] Initially, the second spring 16 is in a stretched state, and the first push rod 701 and the deflecting rod 15 are in contact. When the pressure inside the safety cover 2 chamber exceeds the elastic potential energy of the first spring 8, the movable shaft 7 moves axially along the pressure tank 3. At this time, the first push rod 701 compresses the deflecting rod 15, causing the deflecting rod 15 to deflect. The stretch of the second spring 16 increases. When the deflecting rod 15 deflects to the same horizontal plane as the support plate 14, the stretch of the second spring 16 reaches its maximum value. At this point, the chlorine pressure inside the safety cover 2 chamber is... Once the chlorine pressure exceeds the threshold, the balance between the deflection rod 15 and the support plate 14 is broken. Under the action of the second spring 16, the deflection rod 15 quickly deflects towards the locking part, triggering the opening and closing part to start and stop the power supply to the electrolytic cell 1. When the chlorine pressure exceeds the balance, it can quickly and automatically drive the power supply to the electrolytic cell 1, thereby reducing the chlorine production rate. This ensures the effective release of chlorine in the safety cover 2, prevents chlorine retention caused by excessive pressure, and avoids mechanical damage to the ion membrane.

[0050] It should be noted that: In the initial state, the second spring 16 exerts a reverse rotational force on the deflection rod 15. However, under the restriction of the limiting block 1401, the deflection rod 15 can only be in an inclined state. Under the action of the first push rod 701, when the deflection rod 15 deflects from the initial position to the equilibrium state with the support plate 14, the tension of the second spring 16 increases during this process. The second spring 16 always exerts a reverse rotational force on the deflection rod 15, but this force is less than the pushing force of the first push rod 701. When the deflection rod 15 is disengaged from the equilibrium state with the support plate 14, the deflection of the deflection rod 15 is driven by the elastic force stored in the second spring 16. When the deflection rod 15 deflects to abut against another limiting block 1401, the deflection rod 15 also abuts against the second push rod 702, so that after the chlorine pressure decreases, the deflection rod 15 can reset and release the pressure on the switch 13.

[0051] The opening and closing component includes a control board 12 fixedly installed on the safety cover 2, and the control board 12 is provided with a switch 13 that can control the operation of the electrolytic cell 1.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A chlorine pressure balance control device at the outlet of an electrolytic cell in an ion-exchange membrane caustic soda apparatus, wherein the device is installed on an electrolytic cell (1), and a safety cover (2) communicating with the inner side is installed on the electrolytic cell (1), characterized in that... ； It includes a pressure balancing mechanism, which includes a pressure tank (3) fixedly installed on the safety cover (2) and communicating with the inside of the safety cover (2) and an elastic extrusion member disposed in the pressure tank (3); It also includes a triggering mechanism disposed on the safety cover (2). When the gas pressure inside the safety cover (2) exceeds the threshold, the elastic extrusion member extrudes the triggering mechanism to drive the triggering mechanism to generate an instantaneous force on the opening and closing member disposed on the safety cover (2).

2. The chlorine gas pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit according to claim 1, characterized in that, The elastic extrusion member includes a piston (6) that is slidably and sealingly connected to the inside of the pressure tank (3), and a movable shaft (7) is provided along the axial direction of the piston (6); It also includes a pressing disc (9), which is arranged along the axial direction of the pressure tank (3) and slidably connected to the inner wall of the pressure tank (3). A first spring (8) is connected between the pressing disc (9) and the piston (6). One end of the first spring (8) abuts against the piston (6) and the other end abuts against the pressing disc (9).

3. The chlorine gas pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit according to claim 2, characterized in that, The movement of the extrusion disc (9) on the inner wall of the pressure tank (3) is controlled by at least one set of adjustment components disposed on the pressure tank (3).

4. The chlorine gas pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit according to claim 3, characterized in that, The adjusting assembly includes a lead screw (10) rotatably mounted on the pressure tank (3), and a threaded sleeve (11) that is fixed to the extrusion plate (9) is threadedly connected to the lead screw (10).

5. The chlorine gas pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit according to claim 2, characterized in that, The piston (6) passes through the pressure tank (3) and has a first push rod (701) and a second push rod (702) on one end that extends out of the pressure tank (3) and abuts against the triggering mechanism.

6. The chlorine gas pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit according to claim 5, characterized in that, The triggering mechanism includes a support plate (14) fixedly installed on the safety cover (2). One end of the support plate (14) is hinged with a deflection rod (15) that can abut against the first push rod (701) or the second push rod (702). The support plate (14) is symmetrically provided with limiting blocks (1401) to limit the deflection rod (15). It also includes a second spring (16), one end of which is hinged to the support plate (14) and the other end is hinged to the deflection rod (15).

7. The chlorine gas pressure balance control device at the outlet of the electrolytic cell in an ion-exchange membrane caustic soda unit according to claim 1, characterized in that, The opening and closing component includes a control board (12) fixedly installed on the safety cover (2), and the control board (12) is provided with a switch (13) that can control the operation of the electrolytic cell (1).

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