An acid adding device for ion-exchange membrane caustic soda production

Abstract

The utility model relates to ion exchange membrane caustic soda technical field, and disclose a kind of acid adding device for ion exchange membrane caustic soda production, including electrolytic cell body, still including the liquid inlet pipe being communicated in electrolytic cell body inner wall, the side of electrolytic cell body is fixed with liquid storage tank, the top of liquid storage tank is provided with tank cover, the top of tank cover is provided with microcontroller, the inner wall of microcontroller is fixed with liquid supplementing pipe, the inner wall of liquid supplementing pipe is provided with solenoid valve;Quantitative assembly is set to the top of tank cover;Response component is set to the inside of liquid storage tank, the utility model can be quantitative control to the amount of hydrochloric acid by setting quantitative assembly, ensure that the pH value in anode groove is in proper range, improve the safety when ion exchange membrane caustic soda production, the hydrochloric acid in liquid storage tank can be automatically replenished by setting response component, the process of staff supplementing hydrochloric acid is saved, labor cost is saved, and by automatic replenishment, ion exchange membrane caustic soda production acidification work is more stable.

Description

Technical Field

[0001] This utility model relates to the field of ion-exchange membrane caustic soda technology, specifically to an acid addition device for ion-exchange membrane caustic soda production. Background Technology

[0002] Currently, caustic soda production uses ion-exchange membrane electrolysis, typically employing cation exchange membranes. First, a refined, saturated salt solution flows into the anode chamber of the electrolytic cell, through which direct current passes, causing an electrolytic reaction that generates ion migration and discharge. Negative ions in the solution generate Cl2 at the anode, while positive ions migrate to the cathode to generate NaOH and H2. The resulting brine contains a certain amount of free chlorine, which severely corrodes equipment and pipelines. Therefore, it needs to be removed, which can be achieved by adding a certain amount of hydrochloric acid to the brine.

[0003] During electrolysis, the pH value within the electrolytic cell needs to be strictly controlled. However, some existing acid-adding devices for ion-exchange membrane caustic soda production struggle to precisely control the amount and concentration of hydrochloric acid added. A pH that is too high or too low will affect electrolysis efficiency and product quality. An excessively high pH will lead to the generation of excessive hydrogen and chlorine gas within the electrolytic cell, increasing safety hazards; a pH that is too low will affect the electrolysis reaction, reducing the yield and quality of caustic soda. Furthermore, some existing acid-adding devices for ion-exchange membrane caustic soda production supply acid to the electrolytic cell through hydrochloric acid storage tanks. However, these tanks cannot be automatically replenished after use, causing the acid-adding process to be interrupted if staff do not replenish the hydrochloric acid in a timely manner. Utility Model Content

[0004] The purpose of this invention is to provide an acid addition device for ion-exchange membrane caustic soda production, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an acid addition device for ion-exchange membrane caustic soda production, comprising an electrolytic cell body, and further comprising:

[0006] An inlet pipe is connected to the inner wall of the electrolytic cell body. A storage tank is fixed on one side of the electrolytic cell body. A tank cover is provided on the top of the storage tank. A microcontroller is provided on the top of the tank cover. A replenishment pipe is fixed on the inner wall of the microcontroller. A solenoid valve is provided on the inner wall of the replenishment pipe. The solenoid valve is connected to the microcontroller via a signal.

[0007] A metering assembly for controlling the amount of hydrochloric acid added is disposed on the top of the tank cover, the metering assembly including a metering pump detachably mounted on the top of the tank cover;

[0008] A sensing component for automatically replenishing hydrochloric acid is installed inside the storage tank. The sensing component includes a level tube fixed to the bottom of the tank cover. A high level alarm and a low level alarm are respectively fixed to the top and bottom of the inner cavity of the level tube.

[0009] Preferably, the inlet end of the metering pump is connected to a suction pipe, the outlet end of the metering pump is connected to a delivery pipe, and the delivery pipe is connected to one end of the inlet pipe.

[0010] Preferably, the inner wall of the liquid level tube is provided with several through holes, and a float ball is provided inside the liquid level tube.

[0011] Preferably, the float is positioned between the high liquid level alarm and the low liquid level alarm, both of which are connected to the microcontroller signal.

[0012] Preferably, a partition is fixed to the inner wall of the electrolytic cell body, the partition dividing the internal space of the electrolytic cell body into an anode tank and a cathode tank, and the liquid inlet pipe is connected to the inner wall of the anode tank.

[0013] Preferably, the top of the electrolytic cell body is provided with a cell cover, and the inner wall of the cell cover is respectively fixed with an anode rod mounting tube and a cathode rod mounting tube.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention can quantitatively control the amount of hydrochloric acid delivered to the anode tank by setting a quantitative component, ensuring that the pH value in the anode tank is within a suitable range, thus improving the safety of ion-exchange membrane caustic soda production. By setting a sensing component, the hydrochloric acid in the storage tank can be automatically replenished, eliminating the need for manual replenishment and saving labor costs. Furthermore, automated replenishment can greatly improve work efficiency and make the acid addition operation of ion-exchange membrane caustic soda production more stable. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the acid addition device for ion-exchange membrane caustic soda production provided by this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the electrolytic cell body provided by this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the liquid storage tank provided by this utility model;

[0019] Figure 4 A schematic diagram of the structure of the sensing component provided by this utility model.

[0020] In the diagram: 1. Electrolytic cell body; 2. Inlet pipe; 3. Storage tank; 4. Tank cover; 5. Microcontroller; 6. Replenishment pipe; 7. Solenoid valve; 8. Metering component; 81. Metering pump; 82. Suction pipe; 83. Delivery pipe; 9. Sensing component; 91. Liquid level pipe; 92. High liquid level alarm; 93. Low liquid level alarm; 94. Through hole; 95. Float; 10. Baffle; 11. Anode tank; 12. Cathode tank; 13. Tank cover; 14. Anode rod mounting pipe; 15. Cathode rod mounting pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 As shown, an acid-adding device for ion-exchange membrane caustic soda production includes an electrolytic cell body 1 and an inlet pipe 2 connected to the inner wall of the electrolytic cell body 1. A storage tank 3 is fixed to one side of the electrolytic cell body 1, and a tank cover 4 is provided on the top of the storage tank 3. A microcontroller 5 is provided on the top of the tank cover 4, and a replenishment pipe 6 is fixed to the inner wall of the microcontroller 5. A solenoid valve 7 is provided on the inner wall of the replenishment pipe 6, and the solenoid valve 7 is signal-connected to the microcontroller 5. The inlet pipe 2 connected to the inside of the electrolytic cell body 1 facilitates the replenishment of salt to the anode tank 11 inside the electrolytic cell body 1. Hydrochloric acid can be stored in a storage tank 3 fixed to one side of the electrolytic cell body 1. The storage tank 3 can be sealed by a tank cover 4. A microcontroller 5 is used to control the start of the solenoid valve 7. The working principle of the microcontroller 5 has been disclosed in "A Water Tank Level Detection Device" with application number "CN202321456088.9", and will not be elaborated here. The replenishment pipe 6 is connected to the equipment for transporting hydrochloric acid through a flange and is used to transport hydrochloric acid to the storage tank 3. The solenoid valve 7 can control the opening and closing of the replenishment pipe 6 to limit the transport of hydrochloric acid.

[0023] A metering component 8, installed on the top of the tank cover 4, controls the amount of hydrochloric acid added. This component allows for precise control of the amount of hydrochloric acid delivered to the anode tank 11, ensuring the pH value within the anode tank 11 remains within a suitable range. The metering component 8 includes a metering pump 81 detachably mounted on the top of the tank cover 4. The inlet of the metering pump 81 is connected to a suction pipe 82, and the outlet of the metering pump 81 is connected to a delivery pipe 83, which is connected to one end of the inlet pipe 2. By using the metering pump 81, hydrochloric acid in the storage tank 3 can be quantitatively extracted through the suction pipe 82 and then flow into the anode tank 11 through the delivery pipe 83 and the inlet pipe 2. The metering pump 81 is also known as a metering pump or a proportional pump. It is a fluid transport machine that can meet the needs of various strict processes. Its outstanding feature is that it can maintain a constant flow rate regardless of the discharge pressure. The metering pump 81 is usually composed of three parts: motor, transmission box and cylinder. The transmission box components include worm gear mechanism, stroke adjustment mechanism, etc. The cylinder components include pump head, suction valve group, discharge valve group, plunger and packing seal. The flow rate of the pump is adjusted by rotating the adjustment handwheel, which drives the adjustment screw to rotate, thereby changing the distance between the bow-shaped connecting rods, changing the stroke of the plunger (piston) in the pump chamber to determine the flow rate. The metering pump 81, the suction pipe 82, the delivery pipe 83 and the inlet pipe 2 are all connected by flanges.

[0024] A sensing component 9, installed inside the storage tank 3, is used for automatic hydrochloric acid replenishment. This component automatically replenishes hydrochloric acid based on its level within the tank. The sensing component 9 includes a level tube 91 fixed to the bottom of the tank cover 4. A high-level alarm 92 and a low-level alarm 93 are fixed to the top and bottom of the inner cavity of the level tube 91, respectively. Several through holes 94 are formed in the inner wall of the level tube 91, and a float 95 is installed inside. The float 95 is positioned between the high-level alarm 92 and the low-level alarm 93, both of which are connected to a microcontroller 5. Fixing the level tube 91 to the bottom of the tank cover 4 facilitates its placement inside the storage tank 3, with the bottom end of the tube extending into the inner cavity of the tank 3. At the bottom, several through holes 94 are opened on the inner wall of the liquid level tube 91 to facilitate the entry of hydrochloric acid solution from the storage tank 3 into the liquid level tube 91. Since a float 95 is installed in the liquid level tube 91, the float 95 will move up and down with the change of hydrochloric acid liquid level in the liquid level tube 91. When the hydrochloric acid liquid level rises, the float 95 rises until it contacts the high liquid level alarm 92 in the liquid level tube 91. The high liquid level alarm 92 is activated and transmits a signal to the microcontroller 5. The microcontroller 5 controls the closing of the solenoid valve 7 of the replenishment tube 6. When the hydrochloric acid liquid level drops, the float 95 drops until it contacts the low liquid level alarm 93 in the liquid level tube 91. The low liquid level alarm 93 is activated and transmits a signal to the microcontroller 5. The microcontroller 5 controls the opening of the solenoid valve 7 of the replenishment tube 6 to replenish the hydrochloric acid in the storage tank 3.

[0025] A partition 10 is fixed to the inner wall of the electrolytic cell body 1, dividing the internal space of the electrolytic cell body 1 into an anode tank 11 and a cathode tank 12. The liquid inlet pipe 2 is connected to the inner wall of the anode tank 11. A tank cover 13 is provided on the top of the electrolytic cell body 1, and an anode rod mounting pipe 14 and a cathode rod mounting pipe 15 are fixed to the inner wall of the tank cover 13 respectively. By setting the partition 10, the internal space of the electrolytic cell body 1 can be divided into two equal parts, one part being the anode tank 11 and the other part being the cathode tank 12. The liquid inlet pipe 2 is connected to the anode tank 11. The tank cover 13 is used to seal the electrolytic cell body 1. The anode rod mounting pipe 14 is used to install the anode rod, so that the anode rod enters the anode tank 11. The cathode rod mounting pipe 15 is used to install the cathode rod, so that the cathode rod enters the cathode tank 12.

[0026] Working principle: During the production of caustic soda using an ion-exchange membrane, hydrochloric acid needs to be added to the anode tank 11 within the electrolytic cell body 1. When adding hydrochloric acid, the metering pump 81 draws a quantitative amount of hydrochloric acid from the storage tank 3 through the extraction pipe 82, and then flows it into the anode tank 11 through the delivery pipe 83 and the inlet pipe 2. As the amount of hydrochloric acid in the storage tank 3 decreases after use, the hydrochloric acid solution level continuously drops. At this time, the float 95 in the level pipe 91 descends until it contacts the low-level alarm 93 in the level pipe 91. The low-level alarm 93 activates and transmits a signal to the microcontroller 5. The microcontroller 5 controls the opening of the solenoid valve 7 of the replenishment pipe 6 to replenish the hydrochloric acid in the storage tank 3. After replenishment, the level rises accordingly. At this time, the float 95 rises until it contacts the high-level alarm 92 in the level pipe 91. The high-level alarm 92 activates and transmits a signal to the microcontroller 5. The microcontroller 5 controls the closing of the solenoid valve 7 of the replenishment pipe 6 to stop replenishment.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An acid addition device for ion-exchange membrane caustic soda production, comprising an electrolytic cell body (1), characterized in that, Also includes: A liquid inlet pipe (2) is connected to the inner wall of the electrolytic cell body (1). A liquid storage tank (3) is fixed on one side of the electrolytic cell body (1). A tank cover (4) is provided on the top of the liquid storage tank (3). A microcontroller (5) is provided on the top of the tank cover (4). A liquid replenishment pipe (6) is fixed on the inner wall of the microcontroller (5). A solenoid valve (7) is provided on the inner wall of the liquid replenishment pipe (6). The solenoid valve (7) is connected to the microcontroller (5) via a signal. A metering component (8) for controlling the amount of hydrochloric acid added is provided on the top of the tank cover (4). The metering component (8) includes a metering pump (81) that is detachably mounted on the top of the tank cover (4). The sensing component (9) for automatically replenishing hydrochloric acid is installed inside the storage tank (3). The sensing component (9) includes a liquid level tube (91) fixed to the bottom of the tank cover (4). A high liquid level alarm (92) and a low liquid level alarm (93) are fixed to the top and bottom of the inner cavity of the liquid level tube (91), respectively.

2. The acid addition device for ion-exchange membrane caustic soda production according to claim 1, characterized in that: The metering pump (81) has a liquid inlet end connected to a liquid extraction pipe (82) and a liquid outlet end connected to a liquid delivery pipe (83), which is connected to one end of the liquid inlet pipe (2).

3. The acid addition device for ion-exchange membrane caustic soda production according to claim 1, characterized in that: The inner wall of the liquid level tube (91) is provided with several through holes (94), and a float ball (95) is provided inside the liquid level tube (91).

4. The acid addition device for ion-exchange membrane caustic soda production according to claim 3, characterized in that: The float (95) is positioned between the high liquid level alarm (92) and the low liquid level alarm (93), both of which are connected to the microcontroller (5) via signals.

5. The acid addition device for ion-exchange membrane caustic soda production according to claim 1, characterized in that: The inner wall of the electrolytic cell body (1) is fixed with a partition (10), which divides the internal space of the electrolytic cell body (1) into an anode tank (11) and a cathode tank (12). The liquid inlet pipe (2) is connected to the inner wall of the anode tank (11).

6. The acid addition device for ion-exchange membrane caustic soda production according to claim 1, characterized in that: The top of the electrolytic cell body (1) is provided with a cell cover (13), and the inner wall of the cell cover (13) is respectively fixed with an anode rod mounting tube (14) and a cathode rod mounting tube (15).

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