Salt concentration automatic deviation rectification adjustment control system

Abstract

The utility model discloses an automatic salt concentration deviation rectification regulation control system which comprises a softened water tank, a saline water tank, a mixer, an electrolytic bath, a collection tank, a waste liquid tank and a control system, the softened water tank is connected with the mixer, the saline water tank is connected with the mixer, the mixer is connected with the electrolytic bath, the mixer is connected with the waste liquid tank, and the collection tank is connected with the waste liquid tank. The control system is electrically connected with the softened water tank, the saline water tank, the mixer, the electrolytic bath, the collecting tank and the waste liquid tank respectively. According to the utility model, a salt water flow adjusting link and a clear water flow adjusting link are added on a salt concentration adjusting system, so that the flow of a mixed solution and the salt concentration entering an electrolytic bath can be kept at set values through a reasonable adjusting mode, and the stability and long-term reliability of the salt concentration and the flow of a prepared solution can be effectively improved; the quality of the prepared solution can be further improved, and the concentration stability of the generated sodium hypochlorite solution is improved. The system also has the advantages of lower salt consumption and lower power consumption.

Description

Technical Field

[0001] The utility model belongs to the technical field of salt concentration regulation, and particularly relates to an automatic deviation correction regulation control system for salt concentration. Background Art

[0002] The sodium hypochlorite generator is a kind of water treatment disinfection and sterilization equipment. This equipment uses brine as raw material and electrolyzes it in the electrolytic cell to produce sodium hypochlorite solution. When the current density is constant, the concentration and flow stability of the brine determine the concentration and electrolysis efficiency of the sodium hypochlorite solution. In the current prior art, the concentration and flow of the brine are easily interfered by the outside world, and the long-term stability is poor. Manual deviation correction regulation is required, resulting in unstable concentration of the generated sodium hypochlorite solution, increased salt consumption and power consumption.

[0003] In the prior art, the common regulation methods for the brine concentration and flow are as follows: 1. Manually adjust the flow of fresh water and brine to obtain the solution with the required salt concentration and flow; 2. Use the fixed flow saturated brine to mix with the fresh water volume to adjust the salt concentration after mixing. The fresh water flow is automatically adjusted according to the feedback of the salt concentration after mixing, and the brine flow needs to be manually adjusted.

[0004] Although the existing solutions can obtain the solution with fixed salt concentration and flow, the stability is poor and manual participation is required. During the operation of the system, the deviation of salt concentration and flow will occur due to the aging of the pump diaphragm and the unstable concentration of the raw brine (oversaturated state, saturated state, unsaturated state).

[0005] The salt consumption and power consumption of the electrolytic sodium hypochlorite generator are in a restrictive relationship. When the conductivity is too low, the electrolysis voltage increases, increasing the power consumption and the temperature of the electrolytic cell rises, affecting the generation of sodium hypochlorite; when the conductivity is too high, the voltage decreases, and at the same time, the current density remains unchanged, and the electrolyte reaction is incomplete, wasting salt raw materials. When the conductivity of the electrolyte is 40 - 55 mS / cm, the electrolysis efficiency is relatively high, and the power consumption and salt consumption are relatively balanced, and the best benefit can be obtained.

[0006] The patent document with the publication number of CN205472645U discloses a disinfection system for on-line production of sodium hypochlorite, including a water softener, a salt dissolving tank, a sodium hypochlorite generator, a sodium hypochlorite storage tank, a PLC control cabinet and a chlorine adding skid. The water softener, the salt dissolving tank, the sodium hypochlorite generator, the sodium hypochlorite storage tank and the chlorine adding skid are connected in sequence, and the PLC control cabinet is connected with the sodium hypochlorite generator. This utility model is used for on-site preparation of sodium hypochlorite and can control the quality of the raw salt.

[0007] The patent document with the publication number CN220835237U discloses a sodium hypochlorite solution production and dosing facility, including a disinfection dosing pharmacy. This patent can separately manufacture the water softener device, sodium hypochlorite generator device, and metering dosing device. After the water softener device, sodium hypochlorite generator device, and metering dosing device are separately manufactured, they are then installed at the installation site, improving the efficiency of installation construction.

[0008] None of the above patents disclose the technical content of adjusting the salt concentration and flow rate, nor the adjustment method for automatically controlling the salt concentration and the adjustment structure identical to that of the present application. Utility Model Content

[0009] To solve the above technical problems, the present utility model provides a salt concentration automatic deviation correction and adjustment control system.

[0010] The present utility model is achieved through the following technical solutions.

[0011] A salt concentration automatic deviation correction and adjustment control system provided by the present utility model includes a soft water tank, a brine tank, a mixer, an electrolytic cell, a collection tank, a waste liquid tank, and a control system. The liquid outlet of the soft water tank is connected to the liquid inlet of the mixer through a pipeline, the liquid outlet of the brine tank is connected to the liquid inlet of the mixer through a pipeline, the liquid outlet of the mixer is connected to the liquid inlet of the electrolytic cell through a pipeline, the liquid outlet of the mixer is connected to the liquid inlet of the waste liquid tank through a pipeline, the liquid outlet of the electrolytic cell is connected to the liquid inlet of the collection tank through a pipeline, and the control system is electrically connected to the soft water tank, the brine tank, the mixer, the electrolytic cell, the collection tank, and the waste liquid tank respectively.

[0012] Preferably, a filter A is provided at the bottom inside the brine tank, a filter B is provided on the pipeline connecting the brine tank and the mixer, and a pump A is provided on the pipeline connecting the filter B and the mixer.

[0013] Preferably, a covering layer is provided at the bottom inside the brine tank, the filter A is arranged inside the covering layer, and the height of the covering layer is greater than the height of the filter A.

[0014] Preferably, the filter B is a Y-type filter.

[0015] Preferably, a liquid inlet is provided at the upper part of the brine tank, the liquid inlet at the upper part of the brine tank is connected to the liquid outlet of the waste liquid tank through a pipeline, and a reflux valve is provided on the pipeline connecting the brine tank and the waste liquid tank.

[0016] Preferably, a pump B is provided on the pipeline connecting the soft water tank and the mixer, and a flow meter A is provided on the pipeline connecting the pump B and the mixer.

[0017] Preferably, the mixer is connected to the electrolytic cell and the waste liquid tank through a shunt pipe, and a flow meter B and a conductivity meter are sequentially arranged on the non-shunted section of the shunt pipe.

[0018] Preferably, an electric valve A is provided on the shunt section where the shunt pipe is connected to the electrolytic cell, and an electric valve B is provided on the shunt section where the shunt pipe is connected to the waste liquid tank.

[0019] The beneficial effects of the present utility model are as follows:

[0020] The present utility model adds a brine flow rate adjustment and fresh water flow rate adjustment link to the salt concentration adjustment system. Through reasonable adjustment methods, the flow rate and salt concentration of the mixed liquid entering the electrolytic cell can be maintained at the set value. The system can automatically adjust the setting, adjust the salt concentration and flow rate according to needs, effectively improve the stability and long-term reliability of the salt concentration and flow rate of the prepared solution, further improve the quality of the prepared solution, and improve the concentration stability of the generated sodium hypochlorite solution. This system also has the advantages of low salt consumption and low power consumption. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] In the figure: 1 - soft water tank, 2 - pump B, 3 - flowmeter A, 4 - brine tank, 5 - covering layer, 6 - filter A, 7 - filter B, 8 - pump A, 9 - mixer, 10 - flowmeter B, 11 - conductivity meter, 12 - electric valve A, 13 - electric valve B, 14 - electrolytic cell, 15 - collection tank, 16 - waste liquid tank, 17 - reflux valve, 18 - control system, 19 - shunt pipe. Detailed Embodiments

[0023] The technical solution of the present utility model will be further described below, but the scope of protection claimed is not limited thereto.

[0024] As Figure 1 shown, an automatic salt concentration deviation correction and adjustment control system includes a soft water tank 1, a brine tank 4, a mixer 9, an electrolytic cell 14, a collection tank 15, a waste liquid tank 16, and a control system 18. The liquid outlet of the soft water tank 1 is connected to the liquid inlet of the mixer 9 through a pipeline, the liquid outlet of the brine tank 4 is connected to the liquid inlet of the mixer 9 through a pipeline, the liquid outlet of the mixer 9 is connected to the liquid inlet of the electrolytic cell 14 through a pipeline, the liquid outlet of the mixer 9 is connected to the liquid inlet of the waste liquid tank 16 through a pipeline, the liquid outlet of the electrolytic cell 14 is connected to the liquid inlet of the collection tank 15 through a pipeline, and the control system 18 is electrically connected to the soft water tank 1, the brine tank 4, the mixer 9, the electrolytic cell 14, the collection tank 15, the waste liquid tank 16, and the following other components for control. The mixer 9 is used to mix soft water and brine, and the collection tank 15 is used to collect sodium hypochlorite.

[0025] A filter A6 is provided at the bottom inside the brine tank 4, a filter B7 is provided on the pipeline connecting the brine tank 4 and the mixer 9, and a pump A8 is provided on the pipeline connecting the filter B7 and the mixer 9.

[0026] A covering layer 5 is provided at the bottom inside the brine tank 4, the filter A6 is arranged inside the covering layer 5, the height of the covering layer 5 is greater than that of the filter A6, and the material of the covering layer 5 is salt. When the pump A8 draws water from the bottom of the brine tank 4, the setting of the covering layer 5 enables the system to obtain stable saturated brine, and at this time the brine is in a state with a relatively stable salt concentration.

[0027] The filter B7 is a Y-type filter, which forms a two-stage filtration system with the filter A6 to ensure that solid salt particles are filtered cleanly.

[0028] A liquid inlet is provided at the upper part of the brine tank 4, the liquid inlet at the upper part of the brine tank 4 is connected to the liquid outlet of the waste liquid tank 16 through a pipeline, and a reflux valve 17 is provided on the pipeline connecting the brine tank 4 and the waste liquid tank 16.

[0029] A pump B2 is provided on the pipeline connecting the soft water tank 1 and the mixer 9, and a flowmeter A3 is provided on the pipeline connecting the pump B2 and the mixer 9. The flowmeter A3 is a soft water flowmeter used to measure the flow rate of the pump B10.

[0030] The mixer 9 is connected to the electrolytic cell 14 and the waste liquid tank 16 through a shunt pipe 19. The shunt pipe 19 is divided into an undivided section and a divided section. One end of the undivided section is connected to the liquid outlet of the mixer 9, the other end of the undivided section is connected to two divided sections, and the two divided sections are respectively connected to the electrolytic cell 14 and the waste liquid tank 16. A flowmeter B10 and a conductivity meter 11 are arranged in sequence in the flowing direction of the undivided section of the shunt pipe 19. The flowmeter B10 is a mixed flowmeter used to measure the flow rate after the soft water and the brine are mixed; the conductivity meter 11 is used to measure the conductivity of the mixed liquid, and the conductivity of the mixed liquid is used to characterize the salt concentration of the mixed liquid, and the corresponding salt concentration can be obtained through the conductivity.

[0031] An electric valve A12 is provided on the divided section of the shunt pipe 19 connected to the electrolytic cell 14, and an electric valve B13 is provided on the divided section of the shunt pipe 19 connected to the waste liquid tank 16.

[0032] The main process flow is as follows: The pump B2 pumps the soft water in the soft water tank 1, the pump A pumps the brine in the brine tank 4, the soft water and the brine are mixed, and after being mixed by the mixer 9, they are divided into two paths through the shunt pipe 19, and the flow directions are respectively controlled by the electric valve A12 and the electric valve B13. One path enters the electrolytic cell 14 through the electric valve A12, and then enters the collection tank 15 from the electrolytic cell 14; the other path enters the waste liquid tank 16 through the electric valve B13, and the liquid in the waste liquid tank 16 returns to the brine tank 4 through the reflux valve 17.

[0033] 1 - Soft water tank, 2 - Pump B, 3 - Flowmeter A, 4 - Brine tank, 5 - Coating, 6 - Filter A, 7 - Filter B, 8 - Pump A, 9 - Mixer, 10 - Flowmeter B, 11 - Conductivity meter, 12 - Electric valve A, 13 - Electric valve B, 14 - Electrolytic cell, 15 - Collection tank, 16 - Waste liquid tank, 17 - Return valve, 18 - Control system, 19 - Shunt pipe.

[0034] The soft water flow rate is controlled by adjusting the operating frequency of Pump B2 through the control system 18, and the brine flow rate is controlled by adjusting the operating frequency of Pump A8 through the control system 18. In this system, the soft water flow rate is 5 - 8 times that of the brine flow rate, mainly aiming to control the flow rate with soft water and control the salt concentration with brine.

[0035] The control steps of this system are as follows:

[0036] (1) The system determines the required salt concentration, flow rate, and current density according to the equipment model. For example, for a 2000 g / h sodium hypochlorite generator system, the salt concentration is 47 mS / cm, the total flow rate is 286 L / h, and the current density is 1300 A / m 2 ;

[0037] (2) Open the soft water pump, brine pump, and waste liquid electric valve. The control system 18 obtains the feedback signal from the flowmeter A3 and automatically adjusts the operating frequency of Pump B2 through the feedback discrete PI algorithm to adjust the soft water flow rate to 240 L / h (±5%);

[0038] (3) The control system 18 reads the signal feedback by the conductivity meter 11 at the rear end of the mixer 9 and automatically adjusts the operating frequency of Pump A8 through the feedback discrete PID algorithm to adjust the conductivity of the mixed brine to 47 mS / cm (±5%);

[0039] (4) After the signal feedback by the conductivity meter 11 at the rear end of the mixer 9 meets the requirements, the control system 18 reads the signal feedback by the flowmeter B10 and compares it with the designed total flow rate of 286 L / h of the control system 18, and finely adjusts the soft water flow rate to achieve the designed total flow rate of 286 L / h (±5%);

[0040] (5) After the system salt concentration and total flow rate are adjusted stably, when the deviation of the mixed liquid flow rate and salt concentration meets the requirements, open the electric valve A12 and close the electric valve B13. The mixed liquid enters the electrolytic cell 14 for electrolysis, and after generating sodium hypochlorite solution, it enters the collection tank 15.

[0041] Through the above adjustments, the flow rate and salt concentration of the mixed liquid entering the electrolytic cell 14 can be maintained at the set values.

[0042] Example 1: Verify the conductivity regulation ability of the system: Set the soft water flow rate to 220 L / h, and set the conductivity to 30 mS / cm, 40 mS / cm, and 50 mS / cm in sequence. The system runs continuously. Samples are taken 5 minutes after the parameters are set, and the parameters are measured. The data is shown in the following table:

[0043]

[0044] The test lasts for half an hour. The conductivity deviation at the sampling point is less than 2%, and the conductivity control effect is good. The soft water flow rate deviation is less than 5%.

[0045] Example 2:

[0046] Verify the conductivity regulation ability and total flow rate regulation ability of the system: Set the soft water flow rate to 200 L / h, and set the conductivity to 47 mS / cm in sequence. The system runs continuously. Samples are taken every 5 minutes after the parameters are set, and the parameters are measured. The data is shown in the following table:

[0047]

[0048] The test results show that both the conductivity deviation and the total flow rate are less than 5%, and the system has good stability.

Claims

1. A salt concentration automatic deviation correction and adjustment control system, characterized in that: The invention comprises a soft water tank (1), a salt water tank (4), a mixer (9), an electrolytic cell (14), a collecting box (15), a waste liquid tank (16) and a control system (18). The liquid outlet of the soft water tank (1) is connected to the liquid inlet of the mixer (9) through a pipeline, the liquid outlet of the salt water tank (4) is connected to the liquid inlet of the mixer (9) through a pipeline, the liquid outlet of the mixer (9) is connected to the liquid inlet of the electrolytic cell (14) through a pipeline, the liquid outlet of the mixer (9) is connected to the liquid inlet of the waste liquid tank (16) through a pipeline, the liquid outlet of the electrolytic cell (14) is connected to the liquid inlet of the collecting box (15) through a pipeline, and the control system (18) is electrically connected to the soft water tank (1), the salt water tank (4), the mixer (9), the electrolytic cell (14), the collecting box (15) and the waste liquid tank (16) respectively.

2. The salt concentration automatic deviation correction and adjustment control system according to claim 1, characterized in that: A filter A (6) is arranged at the bottom of the salt water tank (4), a filter B (7) is arranged on the pipeline connecting the salt water tank (4) and the mixer (9), and a pump A (8) is arranged on the pipeline connecting the filter B (7) and the mixer (9).

3. The salt concentration automatic deviation correction and adjustment control system according to claim 2, characterized in that: A covering layer (5) is arranged at the bottom of the salt water tank (4), and the filter A (6) is arranged in the covering layer (5). The height of the covering layer (5) is greater than the height of the filter A (6).

4. The salt concentration automatic deviation correction and adjustment control system according to claim 2, characterized in that: The filter B (7) is a Y-type filter.

5. The salt concentration automatic deviation correction and adjustment control system according to claim 1, characterized in that: A liquid inlet is arranged on the upper part of the brine tank (4), and the liquid inlet on the upper part of the brine tank (4) is connected to the liquid outlet of the waste liquid tank (16) through a pipeline. A reflux valve (17) is arranged on the pipeline connecting the brine tank (4) and the waste liquid tank (16).

6. The salt concentration automatic deviation correction and adjustment control system according to claim 1, characterized in that: A pump B (2) is arranged on the pipeline connecting the soft water tank (1) and the mixer (9), and a flow meter A (3) is arranged on the pipeline connecting the pump B (2) and the mixer (9).

7. The salt concentration automatic deviation correction and adjustment control system according to claim 1, characterized in that: The mixer (9) is connected to the electrolytic cell (14) and the waste liquid tank (16) via a shunt pipe (19), and a flow meter B (10) and a conductivity meter (11) are sequentially arranged on the undivided section of the shunt pipe (19).

8. The salt concentration automatic deviation correction and adjustment control system according to claim 7, characterized in that: An electric valve A (12) is provided on the shunt section where the shunt pipe (19) is connected to the electrolytic cell (14), and an electric valve B (13) is provided on the shunt section where the shunt pipe (19) is connected to the waste liquid tank (16).

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