CN217757680U - Chlorate decomposition device - Google Patents
Chlorate decomposition device Download PDFInfo
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- CN217757680U CN217757680U CN202221826648.0U CN202221826648U CN217757680U CN 217757680 U CN217757680 U CN 217757680U CN 202221826648 U CN202221826648 U CN 202221826648U CN 217757680 U CN217757680 U CN 217757680U
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Abstract
The utility model relates to a chlorate decomposition device, including the electrolysis trough, one side of electrolysis trough is connected with light salt solution and advances the pipe, the opposite side is connected with light salt solution exit tube, the trailing end connection of light salt solution exit tube has chlorate decomposer, the cooperation is connected with hydrochloric acid on the chlorate decomposer and advances the pipe, the top of chlorate decomposer is provided with the top cap, it is provided with the (mixing) shaft to rotate on the top cap, be provided with stirring vane on the (mixing) shaft, the (mixing) shaft is connected on the top of top cap is provided with the motor, it is provided with chlorine pipeline to communicate chlorate decomposer on the top cap, be provided with the heating jacket in the chlorate decomposer, and communicate the electrolysis trough on the chlorate decomposer and be provided with the back flow, the cooperation is provided with the control subassembly on the chlorate decomposer, this impracticable novel decomposition efficiency to chlorate is good, and the chlorate content of going into the refined salt solution of groove obtains reducing, to the equipment that slows down the salt solution system, pipeline corrosion has positive meaning.
Description
Technical Field
The utility model relates to a caustic soda processing technology field specifically is a chlorate decomposition device.
Background
The chemical reaction equation for electrolysis of sodium chloride solution is as follows:
anode main reaction: 2 CL-2 e → CL2
Cathode main reaction: 2H2O +2e → H2 ↑ +2OH-
In addition, some side reactions exist, such as Cl2 dissolved in H2O in the anode chamber,
Cl2+H2O＝HCl+HClO
part of OH-permeates and diffuses into the anode chamber to react with HClO to generate NaClO, and the reaction is as follows:
NaOH+HClO→NaClO+H2O
when the ClO-is accumulated to a certain amount, chloric acid, hydrochloric acid and oxygen are generated by discharging at the anode
12ClO-+6H2O—12e→4HClO3+8HCl+3O2↑
HClO3+NaOH→NaClO3+H2O
Chlorate in the brine is mainly generated by the chemical reaction between Cl2 in the brine on the anode side of the electrolytic cell and OH < - > returning from the cathode side, the Cl2 in the anolyte in the cell exists in a large amount, the amount of the OH < - > is determined by the leakage rate of the ionic membrane, the leakage rate is high, the alkali migration rate is large, more chlorate is generated, and conversely, the leakage rate is low, the alkali migration rate is small, and less chlorate is generated.
In an ideal state, the ion membrane is assumed to have no leakage, OH-generated in the brine is little, and the amount of the generated chlorate is also small, but due to the closed circulation of the brine used in the electrolysis by the ion membrane method, chlorate is gradually accumulated to a quite high concentration in a brine system, the content of sodium chloride is reduced, and the current efficiency is reduced. It is estimated that the current efficiency decreases by 1% for every 10g/L decrease in the sodium chloride mass concentration.
In actual production, leakage of the ionic membrane is difficult to guarantee, especially, when damage accidents such as holes and tearing occur, the content of chlorate which reversely leaks from anode brine in cathode side alkali is increased, and finally the standard exceeding of finished alkali chloride is caused. Since sodium chlorate is very oxidizing and is a great hazard to chelating resins, chlorate accumulated in the system must be removed.
Chlorate indexes in an ion membrane caustic soda brine system exceed standards for a long time due to the existing device and the original process, so that the chlorate indexes of the brine entering an electrolytic cell are removed from the standards for a long time, and the problem of unqualified quality of relevant departments due to the fact that chlorate in finished caustic soda exceeds standards also occurs in the later operation stage of the ion membrane, so that the chlorate content in the ion membrane caustic soda brine system needs to be reduced, the chlorate indexes in refined brine entering the cell reach the standards as soon as possible, and the problem that the finished caustic soda does not reach the standards due to the fact that the chlorate exceeds the standards in the later operation stage of the ion membrane is reduced.
In the original flow: the chlorate content of the dilute brine discharged from the electrolytic bath of the ionic membrane is higher (about 16 g/l), the chlorate decomposition efficiency entering the chlorate decomposition device is lower and is about 50%, and the side reaction is increased when the ionic membrane of part of the electrolytic bath runs to the later stage, so that the chlorate content in the ultra-fine brine is higher (about 12 g/l).
The light brine after the chlorate decomposition is directly sent to a dechlorination tower, and as the light brine contains more excessive hydrochloric acid, caustic soda is added for neutralization and the pH value is adjusted to be proper (9-12) for the use of a brine working section, a part of caustic soda is consumed, and the cost is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a chlorate decomposition device to solve among the prior art that proposes among the above-mentioned background art the problem that the decomposition efficiency of chlorate is low and caustic soda adds with high costs.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a chlorate decomposition device, includes the electrolysis trough, one side of electrolysis trough is connected with light salt solution and advances the pipe, and the opposite side is connected with light salt solution exit tube, the trailing end connection of light salt solution exit tube has chlorate decomposer, the cooperation is connected with hydrochloric acid on the chlorate decomposer and advances the pipe, the top of chlorate decomposer is provided with the top cap, it is provided with the (mixing) shaft to rotate on the top cap, be provided with stirring vane on the (mixing) shaft, the (mixing) shaft is connected on the top of top cap is provided with the motor, intercommunication chlorate decomposer is provided with chlorine pipeline on the top cap, be provided with the heating jacket in the chlorate decomposer, just intercommunication electrolysis trough is provided with the back flow on the chlorate decomposer, the cooperation is provided with the control subassembly on the chlorate decomposer.
As a further aspect of the present invention: the monitoring assembly comprises a liquid level meter and a pressure meter, wherein the liquid level meter and the pressure meter are both installed on the top cover, so that the internal pressure and the liquid level of the chlorate decomposition tank can be monitored conveniently.
As a further aspect of the present invention: be provided with the thermocouple in the chlorate decomposer, the outside cooperation thermocouple of chlorate decomposer is provided with the display screen, be provided with the connecting wire between display screen and the thermocouple, be convenient for monitor the inside temperature of chlorate decomposer.
As the utility model discloses further scheme again: the fresh salt water inlet pipe, the fresh salt water outlet pipe, the backflow pipe, the hydrochloric acid inlet pipe and the chlorine pipeline are respectively provided with a flowmeter and a valve, so that the circulation flow, opening and closing of the fresh salt water inlet pipe, the fresh salt water outlet pipe, the backflow pipe, the hydrochloric acid inlet pipe and the chlorine pipeline can be controlled conveniently.
As a further aspect of the present invention: be provided with sealed the pad between top cap and the chlorate decomposer, the both sides of sealed pad are provided with sealed bulge loop, all cooperate on top cap and the chlorate decomposer to have seted up sealed recess, strengthen the leakproofness between top cap and the chlorate decomposer.
As a further aspect of the present invention: a pump body is arranged between the reflux pipe and the chlorate decomposing tank to provide driving force for the reflux after the chlorate is decomposed.
As a further aspect of the present invention: the surfaces of the stirring shaft and the stirring blades are provided with anticorrosive coatings, so that the anticorrosive performance of the stirring shaft and the stirring blades is enhanced.
Compared with the prior art, the utility model has the advantages of:
1. the utility model discloses install motor, (mixing) shaft and stirring vane through the top cap on chlorate decomposer, cooperation through (mixing) shaft, stirring vane and motor can stir the weak brine and the hydrochloric acid that contain chlorate that get into in the chlorate decomposer, improves the decomposition efficiency of chlorate.
2. The utility model discloses change the light salt solution after chlorate decomposes into the anolyte circulation groove of going the electrolysis trough by going the dechlorination tower, the high-purity hydrochloric acid that light salt solution adds in the whole replacement electrolysis troughs, chlorate content in the super smart salt solution is on the high side before not reforming transform, the utility model discloses a new flow operation back, the chlorate content of the refined salt solution of going the electrolysis trough obtains reducing.
3. Compared with the domestic same industry, the utility model, have the advantage that chlorate was removed to the high efficiency, the chlorate content of refined salt water in the electrolysis trough falls in succession after to below 7g/l, has positive meaning to equipment, the pipeline that slows down the salt water system, and the quality problems that finished product caustic soda causes because of chlorate content exceeds standard will obviously reduce.
Drawings
Fig. 1 is a schematic view of the overall structure of a chlorate decomposing device according to the present invention;
fig. 2 is a schematic view of the overall structure of a chlorate decomposing device according to the present invention;
fig. 3 is a schematic view of the overall structure of the chlorate decomposing tank of the present invention;
FIG. 4 is a sectional view showing the overall structure of the chlorate decomposing tank of the present invention;
fig. 5 is a cross-sectional view showing the connection relationship between the stirring shaft and the anti-corrosion coating layer.
In the figure: 1. an electrolytic cell; 2. introducing light salt water; 3. a dilute brine outlet pipe; 4. a chlorate decomposition tank; 5. feeding hydrochloric acid into a pipe; 6. a top cover; 7. a stirring shaft; 8. a stirring blade; 9. a motor; 10. a chlorine pipeline; 11. heating a jacket; 12. a return pipe; 13. a liquid level meter; 14. a pressure gauge; 15. a thermocouple; 16. a display screen; 17. connecting wires; 18. a flow meter; 19. a valve; 20. a gasket; 21. a sealing convex ring; 22. sealing the groove; 23. a pump body; 24. and (4) an anticorrosive coating.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
referring to fig. 1 to 5, in the embodiment of the present invention:
the utility model provides a chlorate decomposition device, including electrolysis trough 1, one side of electrolysis trough 1 is connected with light salt solution and advances pipe 2, the opposite side is connected with light salt solution exit tube 3, the trailing end connection of light salt solution exit tube 3 has chlorate decomposition tank 4, the cooperation is connected with hydrochloric acid on chlorate decomposition tank 4 advances pipe 5, the top of chlorate decomposition tank 4 is provided with top cap 6, it is provided with (mixing) shaft 7 to rotate on the top cap 6, be provided with stirring vane 8 on the (mixing) shaft 7, the (mixing) shaft 7 is connected on the top of top cap 6 and is provided with motor 9, intercommunication chlorate decomposition tank 4 is provided with chlorine pipeline 10 on top cap 6, be provided with heating jacket 11 in the chlorate decomposition tank 4, and intercommunication electrolysis trough 1 is provided with back flow 12 on the chlorate decomposition tank 4, the cooperation is provided with the control subassembly on the chlorate decomposition tank 4.
Referring to fig. 1 and 4, in an embodiment of the present invention: the monitoring subassembly includes level gauge 13 and pressure gauge 14, level gauge 13 and pressure gauge 14 are all installed on top cap 6, can detect the liquid level in chlorate decomposition tank 4 through level gauge 13, can detect the gas pressure in chlorate decomposition tank 4 through pressure gauge 14, be provided with thermocouple 15 in chlorate decomposition tank 4, outside cooperation thermocouple 15 of chlorate decomposition tank 4 is provided with display screen 16, be provided with connecting wire 17 between display screen 16 and the thermocouple 15, detect the temperature in chlorate decomposition tank 4 through thermocouple 15, and will detect signal transmission to display screen 16 department through connecting wire 17, be convenient for to the observation of the inside temperature of chlorate decomposition tank 4.
Referring to fig. 1, in the embodiment of the present invention: the dilute brine inlet pipe 2, the dilute brine outlet pipe 3, the return pipe 12, the hydrochloric acid inlet pipe 5 and the chlorine pipeline 10 are respectively provided with a flowmeter 18 and a valve 19, so that the adjustment, opening and closing of the flow rates of the dilute brine inlet pipe 2, the dilute brine outlet pipe 3, the return pipe 12, the hydrochloric acid inlet pipe 5 and the chlorine pipeline 10 can be conveniently controlled.
Referring to fig. 3 and 4, in an embodiment of the present invention: be provided with sealed pad 20 between top cap 6 and chlorate decomposition tank 4, the both sides of sealed pad 20 are provided with sealed bulge loop 21, all cooperate on top cap 6 and the chlorate decomposition tank 4 to have seted up sealed recess 22, realize sealed between top cap 6 and the chlorate decomposition tank 4 through sealed pad 20, further strengthen the leakproofness between top cap 6 and the chlorate decomposition tank 4 through the cooperation between sealed bulge loop 21 and the sealed recess 22 simultaneously.
Referring to fig. 2, in the embodiment of the present invention: a pump body 23 is arranged between the return pipe 12 and the chlorate decomposing tank 4, and the drive of the dilute brine in the chlorate decomposing tank 4 during the return is realized through the pump body 23.
Referring to fig. 5, in the embodiment of the present invention: the surfaces of the stirring shaft 7 and the stirring blade 8 are provided with anticorrosive coatings 24, the anticorrosive performance of the stirring shaft 7 and the stirring blade 8 is enhanced, and epoxy resin composite coatings are preferably selected as the anticorrosive coatings 24.
Example 2:
referring to fig. 1 to 5, the utility model relates to a chlorate decomposition device, in using, advance the sodium chloride solution through light salt brine and manage 2 and carry and electrolyze in the electrolysis trough 1, afterwards, the electrolytic light salt brine of play groove is carried to chlorate decomposition tank 4 through light salt brine exit tube 3 and is carried out the decomposition of chlorate, and simultaneously, advance the pipe 5 through hydrochloric acid and carry hydrochloric acid into chlorate decomposition tank 4, realize the decomposition of chlorate with the chlorate reaction, and simultaneously, starting motor 9, drive (mixing) shaft 7 through motor 9 and rotate, drive stirring vane 8 through (mixing) shaft 7 and rotate, through stirring vane 8 to the light salt brine and the hydrochloric acid that contain chlorate in getting into chlorate decomposition tank 4 stir, improve the decomposition efficiency of chlorate, simultaneously heat the inside of chlorate decomposition tank 4 through heating jacket 11, and through thermocouple 15 monitoring inside temperature, control the heating of the inside solution of chlorate decomposition tank 4, light salt brine after decomposing chlorate is changed into the anode liquor circulation groove that transports electrolysis trough 1 through backflow pipe 12 into by removing dechlorination tower, all substitute the high-purity salt water of the light salt brine that adds in the electrolysis trough 1, reduce the super chlorate content.
Example 3:
referring to fig. 1 to 5, on the basis of embodiment 2, the utility model relates to a chlorate decomposer, when using, the acid addition amount of the present chlorate decomposition weak brine is properly improved, namely the proportion of hydrochloric acid and weak brine is adjusted from 1 to 8 to 9 to 1, 5 to 6, the over-acid amount of weak brine after chlorate decomposition is increased from 15 to 20g/l to 15 to 35g/l, the control temperature is adjusted from 90 to 95 ℃ to 92 to 95 ℃, by increasing the hydrochloric acid addition amount, the reaction temperature is stabilized, and further the decomposition efficiency of chlorate is improved, the occurrence of side reaction is reduced, the weak brine after chlorate decomposition is changed from a dechlorinating tower to an anode liquid circulation tank of an electrolytic tank 1, the high-purity hydrochloric acid added to weak brine in the electrolytic tank 1 is completely replaced, the chlorate content in ultra-refined brine before reconstruction is higher, about 12 to 14g/l, after the new process of the utility model is operated, the chlorate content refined brine has been reduced to 5 to 6g/l, when the peak current is adjusted, the chlorate decomposition tank is maintained to be higher than the PH of a sodium chlorate refined brine, the PH adjustment tank, the PH adjustment system has the PH of 0.3, the PH adjustment system is decreased to 0.3, the PH adjustment of the PH adjustment system after the alkali addition of the refined brine after the subsequent chlorate, the new process of the chlorate reduction of the chlorate.
The decomposition efficiency of the chlorate is improved to be more than 90 percent from 50 to 60 percent of the prior art, the decomposition efficiency of the chlorate is gradually improved along with the improvement of the amount of the peracid at the temperature of 90 to 93 ℃ of light salt water, the decomposition efficiency of the chlorate can reach 95 percent when the amount of the peracid is more than 30g/l, the decomposition efficiency of the chlorate can reach more than 99 percent when the amount of the peracid is more than 32.8g/l, the amount of the peracid is increased a little, the decomposition rate can possibly reach 100 percent, and the decomposition efficiency of the chlorate can reach more than 90 percent when the amount of the peracid is more than 28 g/l;
by adopting the utility model, the alkali adding amount of the original dechlorination system is obviously reduced, the alkali adding amount is reduced to 0.09-0.13m3/h from the original 0.30-0.45m3/h, and the cost of the caustic soda is saved by about 122 ten thousand yuan each year. The specific calculation is as follows: the caustic soda consumption before transformation is 0.34m3/h, the caustic soda consumption after transformation is 0.11m3/h, the annual operation time is 8300 hours, the caustic soda concentration is 32%, the density is 1.336T/m < 3 >, and the cost saved each year is as follows: 1500x8300x (0.34-0.11) x1.336 x 0.32/10000=122.42 (ten thousand yuan).
In all the above-mentioned schemes, the connection between two components can be selected according to the actual situation, the matching connection of the welding, the bolt and the nut, the bolt or the screw connection or other known connection methods are not repeated herein, and all the above-mentioned schemes relate to the fixed connection, and the welding is considered preferentially, and above, it is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, and according to the technical scheme of the present invention and the utility model concept of the present invention equivalent replacement or change, all should be covered in the protection scope of the present invention.
Claims (7)
1. The utility model provides a chlorate decomposition device, includes electrolysis trough (1), one side of electrolysis trough (1) is connected with weak brine and advances pipe (2), and the opposite side is connected with weak brine exit tube (3), the trailing end connection of weak brine exit tube (3) has chlorate decomposition tank (4), its characterized in that: the cooperation is connected with hydrochloric acid and advances pipe (5) on chlorate decomposition tank (4), the top of chlorate decomposition tank (4) is provided with top cap (6), it is provided with (mixing) shaft (7) to rotate on top cap (6), be provided with stirring vane (8) on (mixing) shaft (7), (mixing) shaft (7) are connected on the top of top cap (6) and are provided with motor (9), intercommunication chlorate decomposition tank (4) is provided with chlorine pipeline (10) on top cap (6), be provided with in chlorate decomposition tank (4) and heat cover (11), just intercommunication electrolysis trough (1) is provided with back flow (12) on chlorate decomposition tank (4), the cooperation is provided with the control subassembly on chlorate decomposition tank (4).
2. The chlorate decomposing device according to claim 1, wherein: the monitoring assembly comprises a liquid level meter (13) and a pressure meter (14), wherein the liquid level meter (13) and the pressure meter (14) are both installed on the top cover (6).
3. The chlorate decomposing device of claim 2, wherein: a thermocouple (15) is arranged in the chlorate decomposition tank (4), a display screen (16) is arranged on the outer side of the chlorate decomposition tank (4) in a matched mode with the thermocouple (15), and a connecting line (17) is arranged between the display screen (16) and the thermocouple (15).
4. The chlorate decomposing device of claim 3, wherein: and the dilute brine inlet pipe (2), the dilute brine outlet pipe (3), the return pipe (12), the hydrochloric acid inlet pipe (5) and the chlorine pipeline (10) are respectively provided with a flowmeter (18) and a valve (19).
5. The chlorate decomposing device of claim 1, wherein: be provided with sealed pad (20) between top cap (6) and chlorate decomposition tank (4), the both sides of sealed pad (20) are provided with sealed bulge loop (21), all cooperate on top cap (6) and the chlorate decomposition tank (4) and seted up sealed recess (22).
6. The chlorate decomposing device according to claim 1, wherein: a pump body (23) is arranged between the return pipe (12) and the chlorate decomposing tank (4).
7. The chlorate decomposing device of claim 1, wherein: and the surfaces of the stirring shaft (7) and the stirring blade (8) are provided with anticorrosive coatings (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221826648.0U CN217757680U (en) | 2022-07-16 | 2022-07-16 | Chlorate decomposition device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221826648.0U CN217757680U (en) | 2022-07-16 | 2022-07-16 | Chlorate decomposition device |
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| CN217757680U true CN217757680U (en) | 2022-11-08 |
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| CN202221826648.0U Active CN217757680U (en) | 2022-07-16 | 2022-07-16 | Chlorate decomposition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117401777A (en) * | 2023-10-30 | 2024-01-16 | 安道麦安邦(江苏)有限公司 | Chlorate decomposition device and method in chlor-alkali production |
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2022
- 2022-07-16 CN CN202221826648.0U patent/CN217757680U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117401777A (en) * | 2023-10-30 | 2024-01-16 | 安道麦安邦(江苏)有限公司 | Chlorate decomposition device and method in chlor-alkali production |
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