CN115679375A - Automatic pH value adjusting system and method in hypochlorous acid preparation process - Google Patents
Automatic pH value adjusting system and method in hypochlorous acid preparation process Download PDFInfo
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- CN115679375A CN115679375A CN202211360304.XA CN202211360304A CN115679375A CN 115679375 A CN115679375 A CN 115679375A CN 202211360304 A CN202211360304 A CN 202211360304A CN 115679375 A CN115679375 A CN 115679375A
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Abstract
The invention discloses an automatic pH value adjusting system and method in a hypochlorous acid preparation process, which comprises the following steps: a pH probe is arranged in the hypochlorous acid storage device and is connected with the PLC control end; the soft water treatment device, the saturated brine storage device and the electrolytic bath are communicated with each other; the waste liquid storage device is communicated with the electrolytic bath through a first controllable valve; the hypochlorous acid storage device is communicated with the electrolytic bath through a second controllable valve; the first controllable valve and the second controllable valve are connected with the PLC, wherein the PLC controls the first controllable valve and the second controllable valve according to the pH value detected by the pH probe so as to realize the automatic adjustment of the pH value in the hypochlorous acid preparation process.
Description
Technical Field
The invention relates to the technical field of electrochemistry, in particular to an automatic pH value adjusting system and method in a hypochlorous acid preparation process.
Background
Hypochlorous acid generator is a common disinfection and deodorization device, which generates hypochlorous acid aqueous solution through electrolysis reaction by applying direct current to saline (sodium chloride solution). The hypochlorous acid water generated by the hypochlorous acid generator is suitable for object surface disinfection, indoor air disinfection, crop disinfection, animal husbandry disinfection, food processing disinfection and the like.
The concentration of HClO in the NaClO solution varies with the pH of the solution, and HClO is a weak acid with a pKa =7.5 that readily reacts with hypochlorite ions (ClO) in aqueous solutions at 25 deg.C - ) And (5) separating. HClO and ClO - The concentration of (2) varies in a non-linear manner depending on the pH of the solution, and the content of HClO is more than 90% of the total amount when the pH is in the range of 5 to 7, and is reduced from 57.2% to 17.5% when the pH is reduced from 7.4 to 8.4. The diluted sodium hypochlorite solution is alkaline, the content of ClO-ions in the solution is most, the sterilization capability of the solution is weak, and the sterilization capability of HClO is about that of ClO - 80 times of ions, so that hypochlorous acid solution with higher concentration can be obtained by adjusting the pH value of the sodium hypochlorite solution. Therefore, the pH stability of hypochlorous acid generated by electrolysis of the hypochlorous acid generator is ensured to have important significance.
Therefore, the requirement of effective chlorine content based on various use scenes has important significance by autonomously regulating and controlling the pH. However, in the prior art, the quality of reaction water is influenced due to different water quality (hardness) from all over the country, and meanwhile, the water inlet pressure is difficult to control, so that the reaction rate of an electrolytic cell is influenced, and the concentration and the pH value of a product are influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an automatic pH value adjusting system and method in the hypochlorous acid preparation process, which are an intelligent device suitable for different water qualities, supporting automatic pH regulation and stable pH output.
In order to achieve the above technical objects, the present invention provides an automatic adjusting system of pH value in the process of preparing hypochlorous acid, comprising:
the system comprises a soft water treatment device, a saturated brine storage device, an electrolytic bath, a waste liquid storage device, a hypochlorous acid storage device and a PLC (programmable logic controller);
a pH probe is arranged in the hypochlorous acid storage device and is connected with the PLC control end;
the soft water treatment device, the saturated brine storage device and the electrolytic bath are mutually communicated; the waste liquid storage device is communicated with the electrolytic bath through a first controllable valve; the hypochlorous acid storage device is communicated with the electrolytic bath through a second controllable valve;
the first controllable valve and the second controllable valve are connected with the PLC, wherein the PLC controls the first controllable valve and the second controllable valve according to the pH detection value acquired by the pH probe so as to realize automatic adjustment of the pH value in the hypochlorous acid preparation process.
Optionally, the PLC controller is further connected to an adjustable peristaltic pump and an adjustable diaphragm pump, wherein a water outlet of the soft water treatment device is connected to a feed inlet of the electrolytic bath through the adjustable diaphragm pump; and a water outlet of the saturated brine storage device is connected with a feed inlet of the electrolytic cell through an adjustable peristaltic pump.
Optionally, the PLC controller is provided with a first control site, a second control site and a third control site, the second control site is connected to the pH probe, the first control site is connected to the first controllable valve, and the third control site is connected to the second controllable valve.
Optionally, a fourth control site and a fifth control site are further disposed on the PLC controller, wherein the fourth control site is connected to the adjustable diaphragm pump; the fifth control site is connected to an adjustable peristaltic pump.
Optionally, the feed inlet of the soft water treatment device is communicated with a tap water interface.
In order to achieve the above technical objects, the present invention provides an automatic pH adjusting method in a hypochlorous acid production process, comprising:
introducing soft water and saturated saline water into an electrolytic cell, electrolyzing by the electrolytic cell, and introducing hypochlorous acid solution generated by an anode of the electrolytic cell into a hypochlorous acid storage device;
detecting the pH value of a hypochlorous acid solution in a hypochlorous acid storage device through a pH probe to obtain a pH detection value;
and judging the pH detection value through the PLC, and adjusting the opening degrees of the first controllable valve and the second controllable valve according to the judgment result until the pH detection value meets a set value.
Optionally, the process of adjusting the opening degree of the first controllable valve includes:
when the pH value is smaller than the pH set value, the opening degree of the first controllable valve is reduced;
and when the pH value is larger than the pH set value, the opening degree of the first controllable valve is increased.
Optionally, when the opening degree of the first controllable valve reaches the maximum or the minimum, the opening degree of the second controllable valve is adjusted, wherein the process of adjusting the opening degree of the second controllable valve includes:
when the pH value is smaller than the pH set value, the opening degree of the second controllable valve is increased;
and when the pH value is larger than the pH set value, the opening degree of the second controllable valve is smaller.
Optionally, when the pH detection value is the same as the pH setting value, the opening degrees of the first controllable valve, the second controllable valve, the adjustable peristaltic pump and the adjustable diaphragm pump are stabilized.
The invention has the following technical effects:
the invention changes the pressure of two outlets of the waste liquid of the electrolytic cell, further changes the flow of two electrodes of the electrolytic cell, dilutes the product concentration of two electrodes of the electrolytic cell to different degrees, realizes that the pH of the anode electrolysis product can be effectively regulated, simultaneously leads different water qualities into the electrolytic cell after being treated by the soft water treatment device, can be suitable for different water qualities, and simultaneously stabilizes different adjustable pumps and valves after the regulation of the pH value is finished so as to ensure the stable output of the pH.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic diagram of a system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems in the prior art, the invention provides the following scheme:
as shown in figure 1, the invention provides an automatic pH value adjusting system in a hypochlorous acid preparation process, which comprises a soft water treatment device, a saturated brine storage device, an electrolytic tank, a hypochlorous acid storage device and a PLC control end, wherein the soft water treatment device is connected with the saturated brine storage device; the electrolytic cell comprises a feed inlet, an alkaline waste liquid outlet and a hypochlorous acid outlet; the PLC control end comprises a first control site, a second control site and a third control site; the pH value probe is arranged in the hypochlorous acid storage device, one end of the pH value probe is in contact with hypochlorous acid in the hypochlorous acid storage device, the other end of the pH value probe is in signal connection with a second control site of the PLC control end, and the second control site is used for receiving data transmitted by the pH value and sending the data to the PLC control end.
The water outlet of the soft water treatment device is communicated with the feed inlet of the electrolytic bath through an adjustable diaphragm pump; the water outlet of the saturated brine storage device is communicated with the feed inlet of the electrolytic cell through an adjustable peristaltic pump; the alkaline waste liquid outlet is communicated with the waste liquid storage device through a first controllable valve; the hypochlorous acid outlet is communicated with the feed inlet of the hypochlorous acid storage device through a second controllable valve.
The first controllable valve is in signal connection with a first control site of the PLC control end, and the first control site is used for providing a signal for controlling the opening of the first controllable valve; the second controllable valve is in signal connection with a third control site of the PLC control end, and the third control site is used for providing a signal for controlling the opening of the second controllable valve; the PLC control end also comprises a fourth control site and a fifth control site; the adjustable diaphragm pump is in signal connection with a fourth control site at the PLC control end, and the fourth control site is used for providing a signal for stabilizing the pressure of the diaphragm pump; the adjustable peristaltic pump is in signal connection with a fifth control site at the control end of the PLC, and the fifth control site is used for providing a signal for stabilizing the pressure of the peristaltic pump.
The water outlet of the soft water treatment device is communicated with the feed inlet of the saturated brine storage device; the feed inlet of the soft water treatment device is communicated with tap water, the electrolytic cell is a diaphragm electrolytic cell device, a second control site signal in a PLC control end is detected, received and generated through a pH value probe, signals of a first control site and a third control site are generated through an automatic adjusting method, a fourth control site signal and a fifth control site signal are generated through presetting, wherein it needs to be noted that the fourth control site signal and the fifth control site signal can be preset through adjustment, signals for generating the first control site and the third control site are generated on the basis of the completion of the adjustment so as to control the opening degrees of a first valve and a second valve, and the automatic adjusting method is executed through the PLC control end.
Aiming at the automatic adjusting system, the invention also provides an automatic adjusting method for the pH value in the hypochlorous acid preparation process, which comprises the following steps:
introducing soft water and saturated brine into an electrolytic cell for electrolysis, and detecting the pH value of hypochlorous acid to obtain a pH detection value; when the pH value is different from the pH set value, the opening degree of the first controllable valve is adjusted through the first control site, and the pH value of the hypochlorous acid is adjusted to the pH set value.
And when the pH detection value is less than the pH set value, reducing the opening degree of the first controllable valve.
And when the pH value is greater than the pH set value, increasing the opening degree of the first controllable valve. And (4) not adjusting the first controllable valve until the pH value is the same as the pH set value.
When the opening degree of the controllable valve 1 is maximum or minimum, the pH value is different from the pH set value, and the opening degree of the second controllable valve is adjusted through the third control point, so that the pH value of the hypochlorous acid is adjusted to the pH set value.
And when the pH value is less than the pH set value, the opening degree of the second controllable valve is increased. And when the pH value is greater than the pH set value, reducing the opening degree of the second controllable valve. And the second controllable valve is not adjusted until the pH value is the same as the pH set value, and the aim of effectively achieving the target value of the pH value is fulfilled by adopting a scheme of mainly controlling the first controllable valve and standby controlling the second controllable valve.
Through the technical scheme, the flow of the two poles of the electrolytic cell can be changed by changing the pressure of the two outlets of the waste liquid of the electrolytic cell, so that the product concentration of the two poles of the electrolytic cell can be diluted to different degrees, and the pH value of the anode electrolysis product can be effectively regulated and controlled.
It should be noted that the soft water tank is used as a water inlet source, which can prevent the inlet pressure from changing due to the pressure fluctuation of the tap water pipe, and the pretreatment by the soft water device can prevent the water source with higher hardness from accumulating in the electrolytic cell to cause blockage.
The principle related to the above technical solution is explained:
1. principle of pH stabilization: firstly, the water quality is stableThe front end of the water-softening device is provided with a water-softening device for removing Ca 2+ Fe 2+ And the like; the pressure at the inlet and the outlet of the electrolytic bath can be stabilized.
2. The pH regulation principle is as follows: by changing the pressure of two outlets of the waste liquid of the electrolytic cell and further changing the flow of two electrodes of the electrolytic cell, the product concentration of two electrodes of the electrolytic cell is diluted in different degrees, and the pH value of the anode electrolysis product can be effectively regulated and controlled.
In the anode electrolysis process: 2H 2 O→2H + +O 2 ；Cl→Cl 2 ；Cl 2 +H 2 O→HOCl+HCl；
In the cathode electrolysis process: h 2 O→OH - +H 2 。
3. The pH stabilizing method comprises the following steps: control flow stability (product concentration will be stable)
3.1 stable and adjustable control of water inlet pressure: adjustable diaphragm pump for pretreating soft water device
3.2 salt concentration output is stable: stable adjustable peristaltic pump
3.3 anode outlet: stabilize valve aperture
3.4 cathode outlet: stabilize valve opening
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An automatic pH value adjusting system in a hypochlorous acid preparation process is characterized by comprising:
the system comprises a soft water treatment device, a saturated brine storage device, an electrolytic bath, a waste liquid storage device, a hypochlorous acid storage device and a PLC (programmable logic controller);
a pH probe is arranged in the hypochlorous acid storage device and is connected with the PLC control end;
the soft water treatment device, the saturated brine storage device and the electrolytic bath are communicated with each other; the waste liquid storage device is communicated with the electrolytic bath through a first controllable valve; the hypochlorous acid storage device is communicated with the electrolytic bath through a second controllable valve;
the first controllable valve and the second controllable valve are connected with the PLC, wherein the PLC controls the first controllable valve and the second controllable valve according to the pH detection value acquired by the pH probe so as to realize automatic adjustment of the pH value in the hypochlorous acid preparation process.
2. The automatic pH adjusting system for hypochlorous acid production process according to claim 1, wherein:
the PLC is also connected with an adjustable peristaltic pump and an adjustable diaphragm pump, wherein the water outlet of the soft water treatment device is connected with the feed inlet of the electrolytic cell through the adjustable diaphragm pump; and a water outlet of the saturated brine storage device is connected with a feed inlet of the electrolytic cell through an adjustable peristaltic pump.
3. The automatic pH adjusting system for hypochlorous acid production process according to claim 1, wherein:
the PLC is provided with a first control site, a second control site and a third control site, the second control site is connected with the pH probe, the first control site is connected with the first controllable valve, and the third control site is connected with the second controllable valve.
4. The automatic pH adjusting system for hypochlorous acid production process according to claim 2, wherein:
the PLC controller is also provided with a fourth control site and a fifth control site, wherein the fourth control site is connected with the adjustable diaphragm pump; the fifth control site is connected to an adjustable peristaltic pump.
5. The automatic pH adjusting system for hypochlorous acid production process according to claim 1, wherein:
the feed inlet of the soft water treatment device is communicated with a tap water interface.
6. The automatic adjusting method of the automatic adjusting system for pH value in the process of preparing hypochlorous acid according to any one of claims 1 to 5, wherein:
introducing soft water and saturated saline water into an electrolytic cell, electrolyzing by the electrolytic cell, and introducing hypochlorous acid solution generated by an anode of the electrolytic cell into a hypochlorous acid storage device;
detecting the pH value of a hypochlorous acid solution in a hypochlorous acid storage device through a pH probe to obtain a pH detection value;
and judging the pH detection value through the PLC, and adjusting the opening degrees of the first controllable valve and the second controllable valve according to the judgment result until the pH detection value meets a set value.
7. The automatic adjustment method according to claim 6, characterized in that:
the process of adjusting the opening of the first controllable valve comprises:
when the pH value is smaller than the pH set value, the opening degree of the first controllable valve is reduced;
and when the pH value is larger than the pH set value, the opening degree of the first controllable valve is increased.
8. The automatic adjustment method according to claim 7, characterized in that:
when the opening degree of the first controllable valve reaches the maximum or the minimum, adjusting the opening degree of a second controllable valve, wherein the process of adjusting the opening degree of the second controllable valve comprises the following steps:
when the pH value is smaller than the pH set value, the opening degree of the second controllable valve is increased;
and when the pH value is larger than the pH set value, the opening degree of the second controllable valve is smaller.
9. The method of claim 6, wherein:
and when the pH value is the same as the pH set value, stabilizing the opening degrees of the first controllable valve, the second controllable valve, the adjustable peristaltic pump and the adjustable diaphragm pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211360304.XA CN115679375A (en) | 2022-11-02 | 2022-11-02 | Automatic pH value adjusting system and method in hypochlorous acid preparation process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211360304.XA CN115679375A (en) | 2022-11-02 | 2022-11-02 | Automatic pH value adjusting system and method in hypochlorous acid preparation process |
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| CN115679375A true CN115679375A (en) | 2023-02-03 |
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| CN202211360304.XA Pending CN115679375A (en) | 2022-11-02 | 2022-11-02 | Automatic pH value adjusting system and method in hypochlorous acid preparation process |
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- 2022-11-02 CN CN202211360304.XA patent/CN115679375A/en active Pending
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