Electrolytic bath cathode water adding process device

Abstract

The utility model relates to the technical field of electrolytic baths, in particular to an electrolytic bath cathode water adding process device, which comprises a catholyte receiving tank, an alkali head tank, a brine head tank, an electrolytic bath and a catholyte separator, a first treatment pipeline is fixedly communicated between the outlet of the catholyte receiving tank and the inlet of the alkali head tank; and an alkali liquor feeding pipeline is fixedly communicated between the bottom outlet of the alkali head tank and the cathode inlet of the electrolytic bath. The device is reasonable and compact in structure and convenient to use, the process condensate water output by the caustic soda process is recycled through the process condensate water inlet pipeline additionally arranged on the desalted water inlet pipeline, the use amount of desalted water is greatly reduced, the energy consumption is saved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic cell technical field, is a kind of electrolytic cell cathode water adding process device. BACKGROUND

[0002] Electrolytic workshop No.1 and No.2 device use Wood electrolytic cell, and Wood electrolytic cell is relatively advanced ion membrane electrolytic cell, when the concentration of cathode of the ion membrane electrolytic cell is adjusted, the water added is desalination water, however, No.1 device electrolytic cell includes 6 electrolytic cells 13.4kA, and it needs to consume desalination water 24.5m3 / h, No.2 device electrolytic cell includes 6 electrolytic cells 14.5kA, and it needs to consume desalination water 26.5m3 / h, the desalination water unit consumption of No.1 and No.2 device (electrolytic cell 11A001A / B / C / D / E / F and electrolytic cell 211A001A / B / C / D / E / F) is 1.20t / day, and the production cost is high. SUMMARY

[0003] The utility model provides a kind of electrolytic cell cathode water adding process device, overcome the above-mentioned prior art, it can effectively solve the problem of high production cost existing in the cathode of existing electrolytic cell adding desalination water.

[0004] The technical scheme of the utility model is realized through the following measures: a kind of electrolytic cell cathode water adding process device, including cathode liquid receiving tank, alkali high tank, salt water high tank, electrolytic cell and cathode liquid separator, cathode liquid receiving tank upper inlet is fixedly connected with alkali liquid feed line, cathode liquid receiving tank outlet and alkali high tank inlet are fixedly connected with first processing pipeline, the outlet at the bottom of alkali high tank and the cathode inlet of electrolytic cell are fixedly connected with second processing pipeline, desalination water inlet pipeline is fixedly connected on second processing pipeline, process condensate water inlet pipeline is fixedly connected on desalination water inlet pipeline, salt water high tank bottom outlet and electrolytic cell anode inlet are fixedly connected with salt water feed line, electrolytic cell anode outlet is fixedly connected with anode liquid outlet pipeline, electrolytic cell cathode outlet and cathode liquid separator inlet are fixedly connected with cathode liquid outlet pipeline, cathode liquid separator upper outlet is fixedly connected with gas outlet pipeline, cathode liquid separator lower outlet and cathode liquid receiving tank bottom inlet are fixedly connected with cathode liquid recycling pipeline.

[0005] The following is further optimization or / and improvement of the above-mentioned utility model technical scheme:

[0006] Pressure transmitter is arranged on the above-mentioned process condensate water inlet pipeline, electric control valve one is arranged on process condensate water inlet pipeline between pressure transmitter and desalination water inlet pipeline, electric control valve two is arranged on desalination water inlet pipeline right side of process condensate water inlet pipeline, and pressure transmitter is electrically connected with electric control valve one and electric control valve two respectively.

[0007] The process condensate water inlet pipeline between the first electric control valve and the desalted water inlet pipeline is provided with an electromagnetic flow meter, and the process condensate water inlet pipeline between the electromagnetic flow meter and the desalted water inlet pipeline is provided with a check valve.

[0008] The bypass pipeline is fixedly connected to the process condensate water inlet pipeline on the left and right sides of the first electric control valve, and the bypass pipeline is fixedly connected to the desalted water inlet pipeline on the left and right sides of the second electric control valve.

[0009] The evaporation delivery pipeline is fixedly connected to the first treatment pipeline, the concentration detector is fixedly installed on the first treatment pipeline between the evaporation delivery pipeline and the cathode liquid receiving tank, the third electric control valve is arranged on the first treatment pipeline between the alkali high tank and the evaporation delivery pipeline, and the concentration detector is electrically connected with the third electric control valve.

[0010] The delivery pump is fixedly installed on the first treatment pipeline between the cathode liquid receiving tank and the concentration detector.

[0011] The utility model discloses a reasonable and compact structure, convenient to use, which realizes the recycling of the process condensate water output by caustic soda process through the newly added process condensate water inlet pipeline on the desalted water inlet pipeline, greatly reduces the use amount of desalted water, saves energy consumption and reduces production cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] ATTACHED Figure 1 It is the process flow schematic diagram of the utility model.

[0013] ATTACHED Figure 1 The codes in the figure are as follows: 1 is a cathode liquid receiving tank, 2 is an alkali high tank, 3 is a salt water high tank, 4 is an electrolytic tank, 5 is a cathode liquid separator, 6 is an alkali liquid feeding pipeline, 7 is a first treatment pipeline, 8 is a second treatment pipeline, 9 is a desalted water inlet pipeline, 10 is a process condensate water inlet pipeline, 11 is a salt water feeding pipeline, 12 is an anode liquid outlet pipeline, 13 is a cathode liquid outlet pipeline, 14 is a gas outlet pipeline, 15 is a cathode liquid recycling pipeline, 16 is a pressure transmitter, 17 is a first electric control valve, 18 is a second electric control valve, 19 is an electromagnetic flow meter, 20 is a check valve, 21 is a bypass pipeline, 22 is an evaporation delivery pipeline, 23 is a concentration detector, 24 is a third electric control valve, and 25 is a delivery pump. DETAILED DESCRIPTION

[0014] The utility model is not limited by the following examples, and the specific implementation mode can be determined according to the technical scheme and actual situation of the utility model.

[0015] In the utility model, if no special instruction is given, the equipment and device used are all the existing commonly known equipment and device in the field, for example, the concentration detector can be the existing commonly known equipment.

[0016] In the utility model, in order to be convenient for description, the relative position relation of each component is all described according to the layout mode of the drawing of the specification, for example, the position relation of front, back, top, bottom, left, right etc. Figure 1 Figure 1

[0017] The utility model will be further described below in combination with examples and drawings:

[0018] Example 1: as shown in the drawing, the electrolytic cell cathode water adding process device, including cathode liquid receiving tank 1, alkali high tank 2, brine high tank 3, electrolytic cell 4 and cathode liquid separator 5, the upper inlet of cathode liquid receiving tank 1 is fixedly connected with lye feed pipeline 6, and the outlet of cathode liquid receiving tank 1 is fixedly connected with the inlet of alkali high tank 2 with first treatment pipeline 7, and the outlet of alkali high tank 2 bottom is fixedly connected with the cathode inlet of electrolytic cell 4 with second treatment pipeline 8, and the second treatment pipeline 8 is fixedly connected with desalted water inlet pipeline 9, and the desalted water inlet pipeline 9 is fixedly connected with process condensate water inlet pipeline 10, and the outlet of brine high tank 3 bottom is fixedly connected with the anode inlet of electrolytic cell 4 with brine feed pipeline 11, and the anode outlet of electrolytic cell 4 is fixedly connected with anode liquid outlet pipeline 12, and the cathode outlet of electrolytic cell 4 is fixedly connected with the inlet of cathode liquid separator 5 with cathode liquid outlet pipeline 13, and the upper outlet of cathode liquid separator 5 is fixedly connected with gas outlet pipeline 14, and the lower outlet of cathode liquid separator 5 is fixedly connected with the bottom inlet of cathode liquid receiving tank 1 with cathode liquid recycling pipeline 15. Figure 1 In the utility model, the concentration of lye used in the electrolytic cell 4 is adjusted by the desalted water delivered by desalted water inlet pipeline 9, but the desalted water consumption is huge, and the production cost is high, after modification, through the newly added process condensate water inlet pipeline 10 on desalted water inlet pipeline 9, the process condensate water output by caustic soda process is recycled, the use amount of desalted water is greatly reduced, the energy consumption is saved, and the production cost is reduced.

[0019] The electrolytic cell cathode water adding process device can be further optimized or / and improved according to actual needs:

[0020] Example 2: it is different from example 1, as shown in the drawing, pressure transmitter 16 is arranged on process condensate water inlet pipeline 10, electric control valve one 17 is arranged on process condensate water inlet pipeline 10 between pressure transmitter 16 and desalted water inlet pipeline 9, electric control valve two 18 is arranged on desalted water inlet pipeline 9 on the right side of process condensate water inlet pipeline 10, and pressure transmitter 16 is electrically connected with electric control valve one 17 and electric control valve two 18 respectively.

[0021] Figure 1

[0022] ​​​​In use, when the pressure of the pressure transmitter 16 is detected to be lower than the set value (lower than 200 kPa), it is preliminarily determined that the process condensate water inlet system is malfunctioning, the interlocked electric control valve one 17 is closed, the electric control valve two 18 is opened, the process condensate water is switched to the desalinated water pipeline, and the normal operation of the device is ensured. Moreover, through such a setting, the desalinated water and the process condensate liquid can be switched in time, and the safe and stable operation of the electrolytic cell 4 can be ensured.

[0023] Example 3 differs from Example 2 in that, as shown in the accompanying drawings, an electromagnetic flowmeter 19 is arranged on the process condensate water inlet pipeline 10 between the electric control valve one 17 and the desalinated water inlet pipeline 9, and a check valve 20 is arranged on the process condensate water inlet pipeline 10 between the electromagnetic flowmeter 19 and the desalinated water inlet pipeline 9. Figure 1

[0024] In use, the operator can adjust the process condensate water flow in time according to the change trend of the pure water flow, effectively prolonging the service life of the ion exchange membrane and greatly improving the safe operation of the electrolytic cell 4; through the check valve 20 arranged, the medium backflow is prevented, and the normal operation of the caustic soda process is affected.

[0025] Example 4 differs from Examples 2 to 3 in that, as shown in the accompanying drawings, bypass pipelines 21 are fixedly connected to the process condensate water inlet pipelines 10 on the left and right sides of the electric control valve one 17, and bypass pipelines 21 are fixedly connected to the desalinated water inlet pipelines 9 on the left and right sides of the electric control valve two 18. Figure 1

[0026] Example 5 differs from Examples 1 to 4 in that, as shown in the accompanying drawings, an evaporation delivery pipeline 22 is fixedly connected to the first treatment pipeline 7, a concentration detector 23 is fixedly installed on the first treatment pipeline 7 between the evaporation delivery pipeline 22 and the cathode liquid receiving tank 1, an electric control valve three 24 is arranged on the first treatment pipeline 7 between the caustic soda high tank 2 and the evaporation delivery pipeline 22, and the concentration detector 23 is electrically connected to the electric control valve three 24. Figure 1

[0027] In use, through the concentration detector 23 arranged, the concentration of the caustic soda is monitored at any time, when the concentration of the caustic soda is lower than 30%, the interlocked electric control valve three 24 is closed, and the caustic soda with low concentration is sent to the subsequent evaporation process through the evaporation delivery pipeline 22 for concentration.

[0028] Example 6 differs from Example 5 in that, as shown in the accompanying drawings, a delivery pump 25 is fixedly installed on the first treatment pipeline 7 between the cathode liquid receiving tank 1 and the concentration detector 23. Figure 1

[0029] ​​​​According to the need, the pipelines and equipment of the electrolytic tank cathode water adding process device can be provided with conventional valves, thermometers and pressure gauges and the like commonly known in the art according to the production needs.

[0030] The above technical features constitute the embodiments of the present application, which have strong adaptability and implementation effects, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0031] The use process of the embodiment of the present application is as follows: first, 32% lye (sodium hydroxide solution) is sent to the cathode liquid receiving tank 1, and then the 32% lye is pumped to the lye high tank 2 by the delivery pump 25 for temporary storage (stable pressure), the 32% lye is gathered with the process condensate water sent by the process condensate water inlet pipeline 10, and then sent to the electrolytic tank 4 through the second treatment pipeline 8 to ensure that the lye concentration in the electrolytic tank 4 is about 30%, the brine in the brine high tank 3 is sent to the electrolytic tank 4, at this time, electrolysis occurs in the electrolytic tank 4, after electrolysis is completed, cathode liquid and anode liquid are obtained, the anode liquid is sent out by the anode liquid outlet pipeline 12 for post-treatment, the cathode liquid is sent to the cathode liquid separator 5 for separation, the gas (hydrogen) is sent out from the gas outlet pipeline 14, finally, the cathode liquid from which the gas is removed is returned to the cathode liquid receiving tank 1 as lye by the cathode liquid recycling pipeline 15, when the concentration detector 23 detects that the concentration of the lye is lower than 30%, the lye is sent to the subsequent evaporation process by the evaporation delivery pipeline 22 for concentration.

[0032] When it is detected that the pressure of the pressure transmitter 16 is lower than the set value (lower than 200kPa), it is preliminarily determined that the process condensate water inlet system has a fault, the interlocking electric control valve one 17 is closed, the electric control valve two 18 is opened, the process condensate water is cut to the desalted water pipeline, and the normal operation of the device is ensured.

Claims

1. A process apparatus for adding water to the cathode of an electrolytic cell, characterized in that... The system includes a cathode receiving tank, an alkali high-level tank, a brine high-level tank, an electrolytic cell, and a cathode separator. An alkali feed pipeline is fixedly connected to the upper inlet of the cathode receiving tank. A first treatment pipeline is fixedly connected between the outlet of the cathode receiving tank and the inlet of the alkali high-level tank. A second treatment pipeline is fixedly connected between the bottom outlet of the alkali high-level tank and the cathode inlet of the electrolytic cell. A demineralized water inlet pipeline is fixedly connected to the second treatment pipeline. A process condensate inlet pipeline is fixedly connected to the demineralized water inlet pipeline. A brine feed pipeline is fixedly connected between the bottom outlet of the brine high-level tank and the anode inlet of the electrolytic cell. An anode liquid outlet pipeline is fixedly connected to the anode outlet of the electrolytic cell. A cathode liquid outlet pipeline is fixedly connected between the cathode outlet of the electrolytic cell and the inlet of the cathode separator. An vent pipeline is fixedly connected to the upper outlet of the cathode separator. A cathode liquid reuse pipeline is fixedly connected between the lower outlet of the cathode separator and the bottom inlet of the cathode receiving tank.

2. The electrolytic cell cathode water addition process apparatus according to claim 1, characterized in that... A pressure transmitter is installed on the process condensate inlet pipeline. An electrically controlled valve one is installed on the process condensate inlet pipeline between the pressure transmitter and the demineralized water inlet pipeline. An electrically controlled valve two is installed on the demineralized water inlet pipeline to the right of the process condensate inlet pipeline. The pressure transmitter is electrically connected to electrically controlled valve one and electrically controlled valve two respectively.

3. The electrolytic cell cathode water addition process apparatus according to claim 2, characterized in that... An electromagnetic flow meter is installed on the process condensate inlet pipeline between the electrically controlled valve and the demineralized water inlet pipeline, and a check valve is installed on the process condensate inlet pipeline between the electromagnetic flow meter and the demineralized water inlet pipeline.

4. The electrolytic cell cathode water addition process apparatus according to claim 2 or 3, characterized in that... Bypass pipelines are fixedly connected to the process condensate inlet pipelines on both the left and right sides of the solenoid valve one, and bypass pipelines are fixedly connected to the demineralized water inlet pipelines on both the left and right sides of the solenoid valve two.

5. The electrolytic cell cathode water addition process apparatus according to claim 1, 2, or 3, characterized in that... An evaporation conveying pipeline is fixedly connected to the first processing pipeline. A concentration detector is fixedly installed on the first processing pipeline between the evaporation conveying pipeline and the cathode liquid receiving tank. An electrically controlled valve three is installed on the first processing pipeline between the alkali high-level tank and the evaporation conveying pipeline. The concentration detector is electrically connected to the electrically controlled valve three.

6. The electrolytic cell cathode water addition process apparatus according to claim 4, characterized in that... An evaporation conveying pipeline is fixedly connected to the first processing pipeline. A concentration detector is fixedly installed on the first processing pipeline between the evaporation conveying pipeline and the cathode liquid receiving tank. An electrically controlled valve three is installed on the first processing pipeline between the alkali high-level tank and the evaporation conveying pipeline. The concentration detector is electrically connected to the electrically controlled valve three.

7. The electrolytic cell cathode water addition process apparatus according to claim 5, characterized in that... A transfer pump is fixedly installed on the first processing pipeline between the cathode liquid receiving tank and the concentration detector.

8. The electrolytic cell cathode water addition process apparatus according to claim 6, characterized in that... A transfer pump is fixedly installed on the first processing pipeline between the cathode liquid receiving tank and the concentration detector.

Images