Chlorate decomposing device in ionic membrane process caustic soda production

Abstract

The utility model provides a chlorate decomposing device in caustic soda production by an ionic membrane method. The chlorate decomposing device comprises a first-stage decomposing tank, a second-stage decomposing tank, a hydrochloric acid pipeline, a light salt brine pipeline, a first elbow, a second elbow, a chlorine outlet and a dechlorination pipeline, wherein the hydrochloric acid pipeline, the light salt brine pipeline and the first elbow are communicated with the first-stage decomposing tank, and the second elbow, the chlorine outlet and the dechlorination pipeline are communicated with the second-stage decomposing tank. According to the chlorate decomposing device in caustic soda production through the ionic membrane method, one end of a liquid discharging pipe can be sealed while a sealing disc is pushed through the elastic acting force of a spring, so that a certain amount of chlorate decomposing solution can be pre-stored in a first-stage decomposing tank, and the chlorate and hydrochloric acid are continuously added; the pressure intensity of liquid at the bottom of the inner side of the primary decomposition tank is increased, so that a sealing disc can be pressed to compress a spring under the action of the liquid pressure, and a solution obtained by primarily decomposing chlorate in the primary decomposition tank can be automatically conveyed into the secondary decomposition tank through a liquid discharge pipe to be continuously decomposed; therefore, the overall treatment efficiency of the decomposition device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chlorate decomposition technical field, specifically disclose a kind of ion exchange membrane method caustic soda production in chlorate decomposition device. BACKGROUND

[0002] Ion exchange membrane method caustic soda production in electrolytic process, the anode side of ion exchange membrane electrolytic cell will produce chlorate due to side reaction, these chlorate flows out with brine, need be decomposed in decomposition tank, the working principle of chlorate decomposition tank mainly relies on high temperature (such as 85 DEG C or more) and strong acid condition, specifically, chlorate reacts with hydrochloric acid in decomposition tank, generates chlorine, sodium chloride and water.

[0003] Patent application number CN202121196699.5 discloses a kind of ion exchange membrane method caustic soda production in chlorate decomposition device;Including primary decomposition tank and secondary decomposition tank, the liquid outlet of primary decomposition tank is connected with the liquid inlet of secondary decomposition tank by liquid pipeline, pump is arranged on liquid pipeline, the liquid outlet of secondary decomposition tank is connected to dechlorination tower by pipeline;The top of primary decomposition tank is provided with liquid inlet, the liquid inlet is connected with mixer, the feed inlet of mixer is connected with brine pipeline and hydrochloric acid pipeline, stirring device is arranged in secondary decomposition tank;Secondary decomposition tank top is provided with hydrochloric acid inlet, the chlorine outlet of primary decomposition tank and secondary decomposition tank is respectively connected with chlorine absorption tower by pipeline;The utility model is cooperated with primary decomposition tank and secondary decomposition tank, realizes to the chlorate enriched in brine step-by-step decomposition, solves the problem that chlorate decomposition tank decomposition flow is limited.

[0004] The above-mentioned primary decomposition tank is not provided with stirring device inside, so that the mixed solution of chlorate and hydrochloric acid cannot be uniformly heated inside the primary decomposition tank, resulting in a low decomposition rate of chlorate inside the primary decomposition tank, and the solution after preliminary decomposition of chlorate inside the primary decomposition tank cannot be automatically discharged into the interior of the secondary decomposition tank for subsequent treatment under the action of pressure, resulting in a low overall processing efficiency of the decomposition device. UTILITY MODEL CONTENTS

[0005] In view of the above defects or deficiencies in the prior art, the present application aims to provide a chlorate decomposition device in ion-exchange membrane caustic soda production, comprising a primary decomposition tank and a secondary decomposition tank, a hydrochloric acid pipeline, a light brine pipeline and a first elbow connected to the primary decomposition tank, and a second elbow, a chlorine gas outlet and a dechlorination pipeline connected to the secondary decomposition tank, a liquid discharge pipe and an air guide pipe are connected between the primary decomposition tank and the secondary decomposition tank, a first stirring device is rotatably connected inside the primary decomposition tank, a second stirring device is rotatably connected inside the secondary decomposition tank, a first pulley is fixedly sleeved on the top end outside of the primary decomposition tank, which extends out of the primary decomposition tank, a second pulley is fixedly sleeved on the top end outside of the secondary decomposition tank, which extends out of the secondary decomposition tank, a driving motor is fixedly installed on the top of the primary decomposition tank, the outer side of the driving motor output shaft is fixedly sleeved with the first stirring device through a shaft sleeve, and the driving motor is drivingly connected between the first pulley and the second pulley through a belt sleeved on the outer side of the first pulley, and a water pump is connected between the first elbow and the second elbow.

[0006] An electromagnetic heating coil is sleeved on the outer side of the primary decomposition tank and the secondary decomposition tank, a fixed block is arranged on the inner side of the secondary decomposition tank, a L-shaped plate is fixedly installed on the outer side of the clamping fixed block by sleeving bolts in the inner side of the fixed block, a fixed rod is movably sleeved in the inner side of the L-shaped plate, a sealing disc is arranged on the outer side of the liquid discharge pipe, and a spring is sleeved on the outer side of the fixed rod between the L-shaped plate and the sealing disc.

[0007] Preferably, flow meters are installed on the outer sides of the hydrochloric acid pipeline and the light brine pipeline.

[0008] Preferably, a support plate is movably sleeved on the outer side of the fixed rod.

[0009] Preferably, a guide groove matched with the fixed block is formed in the inner side of the L-shaped plate.

[0010] The utility model discloses the following effects:

[0011] 1. The chlorate decomposition device in ion-exchange membrane caustic soda production, the elastic force of spring can push the sealing disc and seal one end of the liquid discharge pipe, so that a certain amount of chlorate decomposition solution can be pre-stored in the primary decomposition tank, and as chlorate and hydrochloric acid continue to be added, the liquid pressure at the bottom of the primary decomposition tank increases, so that the sealing disc can be pressed to compress the spring under the action of liquid pressure, so that the solution after the initial decomposition of chlorate in the primary decomposition tank can be automatically transported to the secondary decomposition tank for further decomposition, thereby improving the processing efficiency of the decomposition device as a whole.

[0012] 2. In the chlorate decomposition device of the ion-exchange membrane caustic soda production, the first and second stirring devices inside the primary and secondary decomposition tanks can be driven by a drive motor to rotate synchronously. This allows the mixed solution of chlorate and hydrochloric acid to be uniformly heated by the electromagnetic heating coil inside the primary decomposition tank through stirring, thereby increasing the decomposition rate of chlorate inside the primary decomposition tank. Attached Figure Description

[0013] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A;

[0016] Figure 3 This is a schematic diagram of the drain pipe of this utility model;

[0017] Figure 4 This is a schematic diagram of the L-shaped plate of this utility model.

[0018] In the diagram: 1. Primary decomposition tank; 2. Secondary decomposition tank; 3. Hydrochloric acid pipeline; 4. Dilute brine pipeline; 5. First bend; 6. Second bend; 7. Chlorine outlet; 8. Dechlorination pipeline; 9. Drainage pipe; 10. Gas guide pipe; 11. First stirring device; 12. Second stirring device; 13. First pulley; 14. Second pulley; 15. Drive motor; 16. Water pump; 17. Electromagnetic heating coil; 18. Fixing block; 19. Bolt; 20. L-shaped plate; 21. Fixing rod; 22. Sealing disc; 23. Spring; 24. Flow meter; 25. Support plate; 26. Guide groove. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0020] The accompanying drawings in this utility model embodiment: different types of cross-sectional lines in the drawings are not labeled according to national standards, nor do they specify the material requirements of the components. They are used to distinguish the cross-sectional views of the components in the drawings.

[0021] Please see Figures 1-4A chlorate decomposition device for caustic soda production using an ion-exchange membrane process includes a primary decomposition tank 1 and a secondary decomposition tank 2, a hydrochloric acid pipeline 3, a brine pipeline 4, and a first bend 5 connected to the primary decomposition tank 1, a second bend 6 connected to the secondary decomposition tank 2, a chlorine outlet 7, and a dechlorination pipeline 8. A drain pipe 9 and a gas guide pipe 10 connect the primary decomposition tank 1 and the secondary decomposition tank 2. A first stirring device 11 is rotatably connected inside the primary decomposition tank 1, and a second stirring device 12 is rotatably connected inside the secondary decomposition tank 2. A first pulley 13 is fixedly fitted to the outer side of the top end of the first stirring device 1 extending outside the primary decomposition tank 1, and a second pulley 14 is fixedly fitted to the outer side of the top end of the second stirring device 12 extending outside the secondary decomposition tank 2. The top of the primary decomposition tank 1 is fixedly installed with... A drive motor 15 is provided. The outer side of the output shaft of the drive motor 15 is fixedly connected to the first stirring device 11 through a bushing. The drive motor 15 is connected to the second pulley 14 through a belt fitted on the outer side of the first pulley 13. The drive motor 15 can drive the first stirring device 11 and the second stirring device 12 to rotate synchronously. The first stirring device 11 and the second stirring device 12 can stir and mix the mixed solution located in the primary decomposition tank 1 and the secondary decomposition tank 2. A water pump 16 is connected between the first bend pipe 5 and the second bend pipe 6. The water pump 16 can transport the solution of chlorate decomposition residue in the primary decomposition tank 1 through the first bend pipe 5 and the second bend pipe 6 to the interior of the secondary decomposition tank 2 for further processing.

[0022] Electromagnetic heating coils 17 are installed on the outer sides of both the primary decomposition tank 1 and the secondary decomposition tank 2. By energizing the electromagnetic heating coils 17, the mixed solutions inside the primary decomposition tank 1 and the secondary decomposition tank 2 can be heated respectively, ensuring that the device can provide a suitable temperature for the chlorate decomposition reaction. A fixing block 18 is set at the bottom of the inner side of the secondary decomposition tank 2. An L-shaped plate 20 that snaps onto the outer side of the fixing block 18 is fixedly installed inside the fixing block 18 with bolts 19. A fixing rod 21 is movably sleeved inside the L-shaped plate 20. A sealing plate 22 is set in the middle of the fixing rod 21 and located outside the drain pipe 9. A spring 23 is installed on the outer side of the fixing rod 21 and located between the L-shaped plate 20 and the sealing plate 22. The elastic force of the spring 23 can push the sealing plate 22 to move and at the same time block and seal one end of the drain pipe 9, thereby ensuring that a certain amount of mixed solution can be reserved inside the primary decomposition tank 1 for decomposition reaction.

[0023] Both hydrochloric acid pipeline 3 and saline solution pipeline 4 are equipped with flow meters 24. The flow meters 24 can count the flow rate of hydrochloric acid and saline solution transported inside the hydrochloric acid pipeline 3 and saline solution pipeline 4, and at the same time, ensure that the hydrochloric acid and saline solution are transported to the first-stage decomposition tank 1 in a certain proportion. This ensures that the hydrochloric acid and saline solution mixed solution added to the first-stage decomposition tank 1 can undergo a full decomposition reaction.

[0024] The inner side of the drain pipe 9 is provided with a support plate 25 that is movably sleeved on the outer side of the fixed rod 21. The support plate 25 can limit and guide the fixed rod 21, while allowing the sealing disc 22 to move stably along the axial direction of the fixed rod 21 under the pressure of the liquid, thus facilitating the opening and closing of the sealing disc 22.

[0025] The L-shaped plate 20 has a guide groove 26 inside that matches the fixing block 18. The guide groove 26 can be used to avoid the fixing block 18 and loosen the bolt 19 to adjust the distance between the L-shaped plate 20 and the drain pipe 9. This allows for adjustment of the initial compression of the spring 23 and control of the initial elastic force of the spring 23 on the sealing plate 22. At this time, the capacity of the mixed solution reserved inside the first-stage decomposition tank 1 can be manually adjusted.

[0026] When the decomposition device is working: The brine from the ion-exchange membrane electrolyzer is transported to the first-stage decomposition tank 1 through the brine pipeline 4, and hydrochloric acid is transported to the first-stage decomposition tank 1 through the hydrochloric acid pipeline 3. The flow rate of the brine and hydrochloric acid added to the first-stage decomposition tank 1 is detected by the flow meter 24. The electromagnetic heating coil 17 on the outside of the first-stage decomposition tank 1 is energized to heat the brine and hydrochloric acid mixture inside the first-stage decomposition tank 1. The drive motor 15 is started, which drives the first stirring device 11 and the second stirring device 12 to rotate. The first stirring device 11 stirs the solution inside the first-stage decomposition tank 1. The mixed solution in the primary decomposition tank 1 is stirred. At this time, the chlorate in the brine reacts with the hydrochloric acid, and the generated chlorine gas is transported to the interior of the secondary decomposition tank 2 through the gas guide pipe 10. As the depth of the mixed solution increases, the liquid pressure at the bottom of the inner side of the primary decomposition tank 1 increases. This liquid pressure pushes the sealing disc 22 to move axially along the fixed rod 21, simultaneously compressing the spring 23. At this time, the drain pipe 9 opens, and the mixed solution after preliminary decomposition in the primary decomposition tank 1 is transported to the interior of the secondary decomposition tank 2 through the drain pipe 9. The second stirring device 12 stirs the mixed solution inside the secondary decomposition tank 2, thereby improving the performance of the primary decomposition tank 1. The electromagnetic heating coil 17 on the outside of tank 1 is energized to heat and maintain the temperature of the mixed solution inside the primary decomposition tank 1. The mixed solution inside the secondary decomposition tank 2 continues to decompose. The chlorine gas generated inside the primary decomposition tank 1 and the secondary decomposition tank 2 is discharged to the outside through the chlorine gas outlet 7. As the liquid level of the mixed solution inside the secondary decomposition tank 2 gradually rises, when the elastic force generated by the spring 23 is greater than the pressure difference generated by the liquid pressure inside the primary decomposition tank 1 and the secondary decomposition tank 2, the elastic force of the spring 23 drives the sealing plate 22 to reset, closing the port of the drain pipe 9. At this time, the mixed solution inside the primary decomposition tank 1... The solution will not be supplied to the interior of the secondary decomposition tank 2. The brine formed inside the secondary decomposition tank 2 will eventually be discharged to the outside through the dechlorination pipe 8. When the mixed solution inside the secondary decomposition tank 2 decreases and the pressure difference generated by the liquid pressure inside the primary decomposition tank 1 and the secondary decomposition tank 2 is greater than the elastic force of the spring 23, the liquid pressure will push the sealing disc 22 to move along the axial direction of the fixed rod 21 while compressing the spring 23. At this time, the port of the drain pipe 9 will open, and the mixed solution will continue to be supplied to the interior of the secondary decomposition tank 2. The contents not described in detail in this description are known prior art to those skilled in the art.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A chlorate decomposition device for caustic soda production using an ion-exchange membrane process, comprising a primary decomposition tank (1) and a secondary decomposition tank (2), a hydrochloric acid pipeline (3), a brine pipeline (4), and a first bend (5) connected to the primary decomposition tank (1), a second bend (6) connected to the secondary decomposition tank (2), a chlorine outlet (7), and a dechlorination pipeline (8), characterized in that: A drain pipe (9) and a gas guide pipe (10) are connected between the primary decomposition tank (1) and the secondary decomposition tank (2). A first stirring device (11) is rotatably connected inside the primary decomposition tank (1), and a second stirring device (12) is rotatably connected inside the secondary decomposition tank (2). A first pulley (13) is fixedly fitted on the outer side of the top end of the first stirring device (11) extending outside the primary decomposition tank (1). A second pulley (14) is fixedly fitted on the outer side of the top end of the second stirring device (12) extending outside the secondary decomposition tank (2). A drive motor (15) is fixedly installed on the top of the primary decomposition tank (1). The outer side of the output shaft of the drive motor (15) is fixedly connected to the first stirring device (11) through a bushing. The drive motor (15) is connected to the second pulley (14) through a belt fitted on the outer side of the first pulley (13). A water pump (16) is connected between the first bend pipe (5) and the second bend pipe (6). Electromagnetic heating coils (17) are fitted on the outer sides of both the primary decomposition tank (1) and the secondary decomposition tank (2). A fixing block (18) is provided at the bottom of the inner side of the secondary decomposition tank (2). An L-shaped plate (20) is fixedly installed inside the fixing block (18) by bolts (19). A fixing rod (21) is movably fitted inside the L-shaped plate (20). A sealing disc (22) is provided in the middle of the fixing rod (21) and located outside the drain pipe (9). A spring (23) is fitted on the outer side of the fixing rod (21) and located between the L-shaped plate (20) and the sealing disc (22).

2. The chlorate decomposition device in caustic soda production using an ion-exchange membrane method according to claim 1, characterized in that: Flow meters (24) are installed on the outside of both the hydrochloric acid pipeline (3) and the saline water pipeline (4).

3. The chlorate decomposition device in caustic soda production using an ion-exchange membrane method according to claim 1, characterized in that: The inner side of the drain pipe (9) is provided with a support plate (25) that is movably sleeved on the outside of the fixed rod (21).

4. The chlorate decomposition device in caustic soda production using an ion-exchange membrane method according to claim 1, characterized in that: The L-shaped plate (20) has a guide groove (26) inside that is adapted to the fixing block (18).

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