Electrolytic tank temperature adjusting system

Abstract

The utility model discloses a tank temperature adjusting system of an electrolytic tank. The variable-temperature inlet pipe is communicated with a variable-temperature medium inlet of the plate heat exchanger through a first valve; the variable-temperature outlet pipe is communicated with a variable-temperature medium outlet of the plate heat exchanger through a second valve and a first temperature probe; the first variable-temperature medium inlet pipe is communicated with a temperature adjusting medium inlet of the plate heat exchanger through a third valve, a first meter and a second temperature probe; the first variable-temperature medium outlet pipe is communicated with a temperature adjusting medium outlet of the plate heat exchanger through a fourth valve and a third temperature probe; the second variable-temperature medium inlet pipe is communicated with a temperature adjusting medium inlet of the plate heat exchanger through a fifth valve, a fourth temperature probe and a second meter; and the second variable-temperature medium outlet pipe is communicated with a temperature adjusting medium outlet of the plate heat exchanger through a sixth valve and a fifth temperature probe. According to the utility model, the alkali liquor can be rapidly cooled and heated when the flow of the alkali liquor fluctuates, and meanwhile, the temperature fluctuation of the alkali liquor is accurately controlled.

Description

Technical Field

[0001] The utility model relates to the field of temperature regulation and control, in particular to an electrolytic cell temperature regulation system. Background Art

[0002] The electrolytic cell is the core equipment in the chlor-alkali industry, and the temperature control of the circulating alkali on the cathode side of the electrolytic cell is particularly critical. In order to adjust the temperature of the circulating alkali on the cathode side of the electrolytic cell, the outlet temperature of the alkali solution of the heat exchanger is mainly controlled. The existing facilities use the medium circulation to cool down or heat up through the plate heat exchanger. Specifically, the temperature of the alkali solution flowing out of the plate heat exchanger is controlled by controlling the opening of the medium. The daily temperature adjustment of the system is controlled by manually operating the control valve. Since the circulating alkali flow is unstable, the valve needs to be adjusted frequently. At the same time, when the alkali solution flow fluctuates, it is impossible to achieve rapid cooling, heating, and precise control of the alkali solution temperature. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide an electrolytic cell temperature regulation system, which can quickly cool down and heat up the alkali solution when the alkali solution flow fluctuates, and accurately control the alkali solution temperature fluctuation.

[0004] The purpose of the utility model is achieved through such technical solution:

[0005] An electrolytic cell temperature regulating system, comprising:

[0006] Plate heat exchanger;

[0007] The variable temperature inlet pipe is connected to the variable temperature medium inlet of the plate heat exchanger through the first valve;

[0008] The variable temperature outlet pipe is connected to the variable temperature medium outlet of the plate heat exchanger through a second valve; the variable temperature outlet pipe is provided with a first temperature probe;

[0009] A first temperature-changing medium inlet pipe is connected to the temperature-adjusting medium inlet of the plate heat exchanger through a third valve; a first meter and a second temperature probe are provided on the first temperature-changing medium inlet pipe;

[0010] The first temperature-changing medium outlet pipe is connected to the temperature-adjusting medium outlet of the plate heat exchanger through a fourth valve; a third temperature probe is provided on the first temperature-changing medium outlet pipe;

[0011] The second temperature-changing medium inlet pipe is connected to the temperature-adjusting medium inlet of the plate heat exchanger through a fifth valve; the second temperature-changing medium inlet pipe is provided with a fourth temperature probe and a second meter;

[0012] The second temperature-changing medium outlet pipe is connected to the temperature-regulating medium outlet of the plate heat exchanger through a sixth valve; and a fifth temperature probe is arranged on the second temperature-changing medium outlet pipe.

[0013] Furthermore, the second temperature-changing medium inlet pipe is connected to the temperature-adjusting medium inlet of the plate heat exchanger through the first buffer tank; the fifth valve is located upstream of the first buffer tank, and the second meter is arranged downstream of the first buffer tank; the fourth temperature probe is arranged in the first buffer tank.

[0014] Furthermore, a first liquid level sensor is provided in the first buffer tank, and the first buffer tank is connected to the temperature control medium inlet of the plate heat exchanger through a seventh valve.

[0015] Furthermore, the first buffer tank is also connected to the temperature control medium inlet of the plate heat exchanger through the first pump and the eighth valve via the second metering device.

[0016] Furthermore, the variable temperature inlet pipe is connected to the variable temperature medium inlet of the plate heat exchanger through the second buffer tank, the third meter and the ninth valve; the first valve is located upstream of the second buffer tank; and the second buffer tank is provided with a sixth temperature probe and a second liquid level sensor.

[0017] Furthermore, the second buffer tank is communicated with the temperature-changing medium inlet of the plate heat exchanger through a second pump.

[0018] Furthermore, a third buffer tank is provided on the temperature-variable outlet pipe; the third buffer tank is connected to the temperature-variable medium outlet of the plate heat exchanger through a tenth valve.

[0019] Furthermore, a third buffer tank is provided on the variable temperature outlet pipe; the second valve is located downstream of the third buffer tank; the third buffer tank is connected to the variable temperature medium outlet of the plate heat exchanger through the tenth valve; and a seventh temperature probe and a third liquid level sensor are provided in the third buffer tank.

[0020] Furthermore, the variable temperature inlet pipe and the variable temperature outlet pipe are also connected through a first bypass pipe; the first bypass pipe is provided with an eleventh valve and an eighth temperature sensor;

[0021] The connection point between the first bypass pipe and the temperature-variable outlet pipe is located upstream of the second valve; the connection point between the first bypass pipe and the temperature-variable inlet pipe is located downstream of the first valve.

[0022] Furthermore, a second bypass pipe is provided on the second temperature-changing medium outlet pipe, and two ends of the second bypass pipe are respectively located upstream and downstream of the sixth valve.

[0023] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0024] Two temperature-variable media are introduced into the plate heat exchanger, namely the first temperature-variable medium and the second temperature-variable medium. The first temperature-variable medium can be used to increase the temperature when rapid temperature increase is required, and the second temperature-variable medium can be used when rapid temperature decrease is required. When precise temperature control is required, the temperature value of the first temperature probe is received in real time, and the temperature of the alkali solution is controlled by using the first temperature-variable medium through the third valve or the second temperature-variable medium through the fifth valve. The temperature of the alkali solution can also be controlled by mixing the first temperature-variable medium and the second temperature-variable medium. The specific control is that the heat change of the first temperature-variable medium can be accurately calculated by combining the first meter, the second temperature probe and the third temperature probe; the heat change of the second temperature-variable medium can be accurately calculated by combining the fourth temperature probe, the second meter and the fifth temperature probe, and then combined with the real-time temperature value of the first temperature probe, so that the heat change of the first temperature-variable medium and the second temperature-variable medium can be controlled separately or in combination to accurately adjust the temperature of the alkali solution.

[0025] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings of the present utility model are as follows:

[0027] Figure 1 Schematic diagram of the structure of the electrolytic cell temperature regulation system in this embodiment.

[0028] In the figure: 1. Plate heat exchanger; 2. Variable temperature inlet pipe; 3. First valve; 4. Variable temperature outlet pipe; 5. Second valve; 6. First temperature probe; 7. First variable temperature medium inlet pipe; 8. Third valve; 9. First metering device; 10. Second temperature probe; 11. First variable temperature medium outlet pipe; 12. Fourth valve; 13. Third temperature probe; 14. Second variable temperature medium inlet pipe; 15. Fifth valve; 16. Fourth temperature probe; 17. Second metering device; 18. Second variable temperature medium outlet pipe; 19. Sixth valve; 20. Fifth temperature probe ; 21. The first buffer tank; 22. The first liquid level sensor; 23. The seventh valve; 24. The first pump; 25. The eighth valve; 26. The second buffer tank; 27. The ninth valve; 28. The sixth temperature probe; 29. ​​The second liquid level sensor; 30. The second pump; 31. The third meter; 32. The third buffer tank; 33. The tenth valve; 34. The seventh temperature sensor; 35. The third liquid level sensor; 36. The first bypass pipe; 37. The eleventh valve; 38. The eighth temperature sensor; 39. The second bypass pipe; 40. The twelfth valve. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Example:

[0031] like Figure 1 As shown, a system for regulating the temperature of an electrolytic cell comprises:

[0032] Plate heat exchanger 1;

[0033] The temperature-changing inlet pipe 2 is connected to the temperature-changing medium inlet of the plate heat exchanger 1 through the first valve 3;

[0034] The variable temperature outlet pipe 4 is connected to the variable temperature medium outlet of the plate heat exchanger 1 through the second valve 5; the variable temperature outlet pipe 4 is provided with a first temperature probe 6;

[0035] The first temperature-changing medium inlet pipe 7 is connected to the temperature-adjusting medium inlet of the plate heat exchanger 1 through the third valve 8; the first temperature-changing medium inlet pipe 7 is provided with a first meter 9 and a second temperature probe 10;

[0036] The first temperature-changing medium outlet pipe 11 is connected to the temperature-adjusting medium outlet of the plate heat exchanger 1 through the fourth valve 12; a third temperature probe 13 is provided on the first temperature-changing medium outlet pipe 11;

[0037] The second temperature-changing medium inlet pipe 14 is connected to the temperature-adjusting medium inlet of the plate heat exchanger 1 through the fifth valve 15; the second temperature-changing medium inlet pipe 14 is provided with a fourth temperature probe 16 and a second meter 17;

[0038] The second temperature-changing medium outlet pipe 18 is connected to the temperature-regulating medium outlet of the plate heat exchanger 1 through the sixth valve 19 ; a fifth temperature probe 20 is provided on the second temperature-changing medium outlet pipe 18 .

[0039] In this embodiment, the second temperature variable medium inlet pipe 14 is connected to the temperature control medium inlet of the plate heat exchanger 1 through the first buffer tank 21; the fifth valve 15 is located upstream of the first buffer tank 21, and the second meter 17 is arranged downstream of the first buffer tank 21; the fourth temperature probe 16 is arranged in the first buffer tank 21.

[0040] In this embodiment, a first liquid level sensor 22 is provided in the first buffer tank 21 , and the first buffer tank 21 is connected to the temperature control medium inlet of the plate heat exchanger 1 through a seventh valve 23 .

[0041] In this embodiment, the first buffer tank 21 is also connected to the temperature control medium inlet of the plate heat exchanger 1 through the first pump 24 and the eighth valve 25 via the second metering device 17 .

[0042] In this embodiment, the variable temperature inlet pipe 2 is connected to the variable temperature medium inlet of the plate heat exchanger 1 through the second buffer tank 26, the third metering device 31 and the ninth valve 27; the first valve 3 is located upstream of the second buffer tank 26; and the second buffer tank 26 is provided with a sixth temperature probe 28 and a second liquid level sensor 29.

[0043] In this embodiment, the second buffer tank 26 is connected to the temperature-changing medium inlet of the plate heat exchanger 1 through the second pump 30 .

[0044] In this embodiment, a third buffer tank 32 is provided on the temperature-variable outlet pipe 4 ; the third buffer tank 32 is connected to the temperature-variable medium outlet of the plate heat exchanger 1 through a tenth valve 33 .

[0045] In this embodiment, a third buffer tank 32 is provided on the variable temperature outlet pipe 4; the second valve 5 is located downstream of the third buffer tank 32; the third buffer tank 32 is connected to the variable temperature medium outlet of the plate heat exchanger 1 through the tenth valve 33; and a seventh temperature probe and a third liquid level sensor 35 are provided in the third buffer tank 32.

[0046] In this embodiment, the variable temperature inlet pipe 2 and the variable temperature outlet pipe 4 are also connected through a first bypass pipe 36; the first bypass pipe 36 is provided with an eleventh valve 37 and an eighth temperature sensor 38;

[0047] The connection point between the first bypass pipe 36 and the temperature-variable outlet pipe 4 is located upstream of the second valve 5 ; the connection point between the first bypass pipe 36 and the temperature-variable inlet pipe 2 is located downstream of the first valve 3 .

[0048] In this embodiment, a second bypass pipe 39 is further provided on the second temperature-changing medium outlet pipe 18 , and two ends of the second bypass pipe 39 are respectively located upstream and downstream of the sixth valve 19 .

[0049] The electrolytic cell temperature regulation system of this embodiment works as follows:

[0050] In this embodiment, all valves are controlled flow electromagnetic valves. The first temperature-changing medium is steam, the first meter 9 is a gas flow meter, the second temperature-changing medium is cold water below the predetermined alkali liquid temperature, and the second meter 17 and the third meter 31 are liquid flow meters.

[0051] When the alkali solution enters the system at a stable flow rate, the second pump 30 stops working, and the sixth temperature probe 28 detects the temperature of the incoming alkali solution. Then the alkali solution enters the plate heat exchanger 1 and flows out through the tenth valve 33, and the temperature is detected by the first temperature probe 6. The specific detection structure has the following situations:

[0052] 1. If the temperature detected by the sixth temperature probe 28 is slightly higher than the required alkali solution temperature, the pipelines and valves related to the first temperature variable medium are closed, and the second temperature variable medium is controlled to enter the plate heat exchanger 1 to cool the incoming alkali solution. The heat difference per unit time between the incoming alkali solution temperature and the required alkali solution temperature is calculated, and the opening of the seventh valve 23 is controlled. In combination with the temperature difference between the fourth temperature probe 16 and the fifth temperature probe 20 and the temperature value of the first temperature probe 6, the opening of the seventh valve 23 is adjusted in real time, so that the required alkali solution temperature is adjusted within the required alkali solution temperature range.

[0053] 2. If the temperature detected by the sixth temperature probe 28 is lower than the required alkali liquid temperature, the pipelines and valves related to the second temperature-changing medium are closed. Similarly to the first case, the pipelines and valves related to the first temperature-changing medium are controlled to realize the notification of the required alkali liquid temperature.

[0054] 3. If the temperature detected by the sixth temperature probe 28 is much higher than the required alkali solution temperature, first adjust and process according to the first situation. If the temperature still cannot be reduced, open the eighth valve 25 and the twelfth valve 40 (reduce the pipe diameter restriction of the sixth valve 19 and increase the outflow volume), start the first pump 24 (at this time, the second temperature-variable medium accumulated in the first buffer tank 21 plays a role), increase the amount of the second temperature-variable medium entering the plate heat exchanger 1, and finally achieve precise control of the required alkali solution temperature.

[0055] In the above-mentioned cases, the temperature of the temperature-adjusted alkali solution is relatively unstable during the process of adjusting the opening of each valve. The alkali solution can be mixed by the third buffer tank 32 so that the temperature thereof is relatively uniform.

[0056] When the flow rate of the incoming alkali solution fluctuates, the alkali solution with fluctuating flow rate can be stabilized by the second buffer tank 26. When a large amount of alkali solution needs to be processed quickly, the amount of alkali solution entering the plate heat exchanger 1 can be increased by starting the second pump 30. At the same time, the use of the second pump 30 can stably control the amount of alkali solution entering the plate heat exchanger 1 per unit time, avoiding fluctuations in the amount of the first temperature-changing medium and the second temperature-changing medium, thereby causing fluctuations in the temperature of the alkali solution after the plate heat exchanger 1 is processed.

[0057] If the first temperature-variable medium and the second temperature-variable medium are not sensitive to the temperature regulation of the alkali solution, the first bypass pipe 36 can be used to divert a portion of the alkali solution to be treated and mix it with the alkali solution after the temperature regulation, so as to accurately control the temperature.

[0058] When the plate heat exchanger 1 reaches its flow upper limit, the temperature of the alkali solution passing through the plate heat exchanger 1 is controlled to be higher or lower than a predetermined temperature, and a portion of the alkali solution to be treated is diverted through the first bypass pipe 36 to mix with the alkali solution after the temperature is adjusted, thereby increasing the alkali treatment amount.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. An electrolytic cell temperature control system, characterized in that: include: Plate heat exchanger; The variable temperature inlet pipe is connected to the variable temperature medium inlet of the plate heat exchanger through the first valve; The variable temperature outlet pipe is connected to the variable temperature medium outlet of the plate heat exchanger through a second valve; the variable temperature outlet pipe is provided with a first temperature probe; A first temperature-changing medium inlet pipe is connected to the temperature-adjusting medium inlet of the plate heat exchanger through a third valve; a first meter and a second temperature probe are provided on the first temperature-changing medium inlet pipe; The first temperature-changing medium outlet pipe is connected to the temperature-adjusting medium outlet of the plate heat exchanger through a fourth valve; a third temperature probe is provided on the first temperature-changing medium outlet pipe; The second temperature-changing medium inlet pipe is connected to the temperature-adjusting medium inlet of the plate heat exchanger through a fifth valve; the second temperature-changing medium inlet pipe is provided with a fourth temperature probe and a second meter; The second temperature-changing medium outlet pipe is connected to the temperature-regulating medium outlet of the plate heat exchanger through a sixth valve; and a fifth temperature probe is arranged on the second temperature-changing medium outlet pipe.

2. The electrolytic cell temperature control system according to claim 1, characterized in that: The second temperature-changing medium inlet pipe is connected to the temperature-adjusting medium inlet of the plate heat exchanger through the first buffer tank; the fifth valve is located upstream of the first buffer tank, and the second meter is arranged downstream of the first buffer tank; the fourth temperature probe is arranged in the first buffer tank.

3. The electrolytic cell temperature control system according to claim 2, characterized in that: The first buffer tank is provided with a first liquid level sensor, and the first buffer tank is connected with the temperature regulating medium inlet of the plate heat exchanger through a seventh valve.

4. The electrolytic cell temperature control system according to claim 2, characterized in that: The first buffer tank is also connected to the temperature control medium inlet of the plate heat exchanger through the first pump and the eighth valve via the second metering device.

5. The electrolytic cell temperature control system according to claim 1, characterized in that: The variable temperature inlet pipe is connected to the variable temperature medium inlet of the plate heat exchanger through the second buffer tank, the third meter and the ninth valve; the first valve is located upstream of the second buffer tank; the sixth temperature probe and the second liquid level sensor are provided in the second buffer tank.

6. The electrolytic cell temperature control system according to claim 5, characterized in that: The second buffer tank is communicated with the temperature-changing medium inlet of the plate heat exchanger through a second pump.

7. The electrolytic cell temperature control system according to claim 1, characterized in that: A third buffer tank is provided on the temperature-changing outlet pipe; the third buffer tank is connected to the temperature-changing medium outlet of the plate heat exchanger through a tenth valve.

8. The electrolytic cell temperature control system according to claim 1, characterized in that: A third buffer tank is provided on the variable temperature outlet pipe; the second valve is located downstream of the third buffer tank; the third buffer tank is connected to the variable temperature medium outlet of the plate heat exchanger through the tenth valve; a seventh temperature probe and a third liquid level sensor are provided in the third buffer tank.

9. The electrolytic cell temperature regulating system according to any one of claims 1 to 8, characterized in that: The variable temperature inlet pipe and the variable temperature outlet pipe are also connected through a first bypass pipe; the first bypass pipe is provided with an eleventh valve and an eighth temperature sensor; The connection point between the first bypass pipe and the temperature-variable outlet pipe is located upstream of the second valve; the connection point between the first bypass pipe and the temperature-variable inlet pipe is located downstream of the first valve.

10. The electrolytic cell temperature regulating system according to claim 1, characterized in that: The second temperature-changing medium outlet pipe is further provided with a second bypass pipe, and two ends of the second bypass pipe are respectively located upstream and downstream of the sixth valve.

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