CN115015485A - On-line monitoring model and system for effective chlorine concentration of effluent of subacid electrolyzed water generator - Google Patents
On-line monitoring model and system for effective chlorine concentration of effluent of subacid electrolyzed water generator Download PDFInfo
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Abstract
The invention discloses an on-line monitoring model and system for the effective chlorine concentration of effluent of a subacid electrolyzed water generator.
Description
Technical Field
The invention relates to the field of artificial intelligence and on-line monitoring, in particular to an on-line monitoring model and system for effective chlorine concentration of effluent of a subacid electrolyzed water generator.
Background
The subacid electrolyzed water generator is a device for electrolyzing a hydrochloric acid aqueous solution by using a diaphragm-free electrolytic cell to generate an acidic aqueous solution (pH value is 5.0-6.5) with hypochlorous acid as a main component. The slightly acidic electrolyzed water has the characteristics of high sterilization efficiency, high safety, no residue and the like, is rapidly developed in China in recent years, and is widely applied to the aspects of cleaning and sterilization in the fields of medical treatment and health, livestock and poultry breeding, food processing and the like.
The sterilizing capability of the slightly acidic electrolyzed water is mainly influenced by the concentration of the effective chlorine, so that the real-time detection of the concentration of the effective chlorine of the effluent of the slightly acidic electrolyzed water generator is extremely important. Currently, there are three main methods for measuring the effective chlorine concentration:
(1) iodometry: the iodometry method is characterized in that effective chlorine in subacid electrolyzed water and potassium iodide are used for oxidation, then iodine is titrated by a sodium thiosulfate standard solution, and the content of the effective chlorine is calculated according to the consumption of the sodium thiosulfate standard solution. The method is commonly used for laboratory detection, and the used reagent is complex in configuration and cannot realize instant and rapid test.
(2) Portable instrument rapid detection method: the portable instrument rapid detection method adopts the technical scheme that after o-toluene and residual chlorine in water react, a solution is yellow, and the effective chlorine concentration is calculated through absorbance. The method has the advantages of high detection speed and convenience in carrying, but has the problem that the test cannot be carried out immediately.
(3) The sensor online detection method comprises the following steps: the sensor on-line detection method is manufactured by using a Clark type current sensor and adopting a microelectronic technology and is used for measuring the concentration of hypochlorous acid (HOCl) in water. This sensor consists of three electrodes of small electrochemical type, one Working Electrode (WE), one Counter Electrode (CE) and one Reference Electrode (RE). The method of measuring the concentration of hypochlorous acid (HOCl) in water is based on measuring the change in current generated by the working electrode due to the change in hypochlorous acid concentration.
However, the existing available chlorine on-line sensor technology is not mature, and has the problems of poor stability, overhigh cost and the like.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide an on-line monitoring model machine system based on the effective chlorine concentration of the effluent of a subacid electrolyzed water generator. Can quickly and stably detect the effective chlorine concentration value in real time.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an on-line monitoring model for effective chlorine concentration of effluent of a subacid electrolyzed water generator is as follows:
wherein:Ythe concentration of effective chlorine of the subacid electrolyzed water is mg/L;
Iis the electrolysis current, A;
Qthe water inlet flow rate is L/min;
Cthe electrolyte concentration is g/100 mL;
Tthe temperature of water inlet is DEG C;
Pis the influent pH;
ias the first coefficient of influence, when 0 <Q＜3，iThe value is between 0.9 and 0.95; when in useQ≥3，i=1，
αIs the second influence coefficient whenC≥2.5，α=1；0＜C＜2.5，αThe value is between 0.95 and 0.98;
beta represents a time node and takes the value of positive number, Y β Represents the effective chlorine concentration Y of the slightly acidic electrolyzed water at the time point of beta.
Generally, when the on-line monitoring model is used for daily disinfection of the surface of an article, the on-line monitoring model is simplified as follows:
Y = 38.101 + 40.298 I - 16.205 Q + 1.248C - 0.303 T + 0.086 P
in the formula:Yeffective chlorine concentration, mg/L;Iis the electrolysis current, A;Qthe water inlet flow rate is L/min;Cthe electrolyte concentration is g/100 mL;Tthe temperature of water inlet is DEG C;Pthe pH value of the inlet water is shown.
The invention also discloses an online monitoring system based on the model, which mainly comprises a water making part and a control part:
the water making part comprises an electrolysis system, a water inlet system and a sensor group; the electrolysis system is used for electrolyzing to generate subacid hypochlorous acid water; the water inlet system is used for mixing water with subacidity hypochlorous acid water generated by electrolysis; the sensor group comprises a plurality of sensors which are used for respectively acquiring an inlet water temperature value, an inlet water pH value and an electrolyte concentration value; the control part comprises a calculation unit and a storage unit, wherein the calculation unit calculates the effective chlorine concentration Y of the beta-time-point subacid electrolyzed water according to an online monitoring model β (ii) a The storage unit is used for recording the effective chlorine concentration Y of the subacid electrolyzed water at the beta time point β 。
More specifically, an analysis unit is further included for analyzing | Y β -Y β-1 |，|Y β -Y β-1 I represents taking Y β And Y β-1 The absolute value of the difference.
More specifically, an alarm unit, | Y β -Y β-1 If | is greater than the first set value, or | Y β -Y 0 When | is greater than the second set value, an alarm is given, Y 0 The effective chlorine concentration standard value of the subacid electrolyzed water is represented, the first set value represents the fluctuation error of the effective chlorine concentration of the subacid electrolyzed water at the adjacent moment, and the second set value represents the deviation from the upper limit of the effective chlorine concentration standard value of the subacid electrolyzed water.
Further, the electrolysis system comprises a peristaltic pump, an electrolysis bath and a mixer in sequence; the water inlet system sequentially comprises a water inlet electromagnetic valve and a water inlet flowmeter; the sensor group comprises an electrolyte concentration sensor, a temperature sensor and a pH sensor; the electrolyte concentration sensor is arranged in the electrolysis system, and the temperature sensor and the pH sensor are arranged in the water inlet system.
In addition, the system also comprises a digital display screen which displays time, electrolytic current, inflow water flow rate, electrolyte concentration, inflow water temperature and inflow water pH in real time.
Compared with the background art, the invention has the beneficial effects that:
1) the method can quickly realize the quick detection of the effective chlorine concentration of the effluent of the subacid electrolyzed water generator;
2) the detection accuracy is not influenced by water flow fluctuation, and compared with the traditional online detection method, the accuracy is higher;
3) compared with the traditional online detection method, the hardware cost is greatly reduced, and the method has important practical significance.
Drawings
Fig. 1 is a schematic view of an online monitoring system according to embodiment 1.
In the figure, 1, an electromagnetic valve 2, a flow meter 3, a temperature sensor 4, a pH sensor 5, an electrolyte concentration sensor 6, a peristaltic pump 7, an electrolytic bath 8, a control module 9, a power supply 10 and a mixer are arranged.
Detailed Description
Example 1
This example further illustrates the model and system for on-line monitoring of the effective chlorine concentration in the effluent of the subacid electrolyzed water generator of the present invention.
In the on-line monitoring model of the present example,
wherein:Ythe concentration of effective chlorine of the subacid electrolyzed water is mg/L;
Iis the electrolysis current, A;
Qthe water inlet flow rate is L/min;
Cthe electrolyte concentration is g/100 mL;
Tthe temperature of water inlet is DEG C;
Pis the influent pH;
ias the first coefficient of influence, when 0 <Q＜3，iThe value is between 0.9 and 0.95; when in useQ≥3，i=1，
αIs the second influence coefficient whenC≥2.5，α=1；0＜C＜2.5，αThe value is between 0.95 and 0.98;
beta represents a time node and takes the value of positive number, Y β Represents the effective chlorine concentration Y of the slightly acidic electrolyzed water at the time point of beta.
When the above formula is used for calculation, all parameters are only the numerical value of each parameter according to the unit requirement.
Under some scenes, the requirement on the effective chlorine concentration of the slightly acidic electrolyzed water is required to be accurate, the effective chlorine concentration value is low, for example, the method is used for disinfecting oral mucosa of a human body, and the first influence coefficient and the second influence coefficient can better correct the accuracy of the effective chlorine concentration of the outlet slightly acidic electrolyzed water.
In more usage scenarios, whenQ≥3，C≥2.5, the model is simplified as follows: y = 38.101 + 40.298I - 16.205 Q + 1.248C - 0.303 T + 0.086 P。
In another embodiment, based on the simplified model, the online monitoring system of the embodiment comprises a water production part, a control part, an analysis unit, an alarm unit and a digital display screen.
The water making part comprises an electrolysis system, a water inlet system and a sensor group; the electrolysis system is used for electrolyzing to generate subacid hypochlorous acid water; the water inlet system is used for mixing water with subacidity hypochlorous acid water generated by electrolysis; the sensor group comprises a plurality of sensors which are used for respectively acquiring an inlet water temperature value, an inlet water pH value and an electrolyte concentration value; taking the attached figure 1 as an example, the electromagnetic valve 1 is opened, electrolysis is started simultaneously, the flow meter 2, the temperature sensor 3 and the pH sensor 4 are sequentially arranged on the pipeline for water inflow, the flow meter 2 acquires the water inflow speed, the temperature sensor 3 acquires the water inflow temperature, the pH sensor 4 acquires the water inflow pH, and data are simultaneously transmitted to the control part 8. An electrolyte concentration sensor 5 is arranged on the electrolytic pipeline to collect the electrolyte concentration, a peristaltic pump 6 supplies 0.6% hydrochloric acid electrolyte, an electrolytic cell 7 electrolyzes hydrochloric acid, meanwhile, the electrolytic current in the electrolytic cell 7 is transmitted back to a control part 8, a mixer 10 mixes tap water with the electrolyzed water and outputs the mixed tap water, and a power supply 9 supplies power to the whole system.
The control part comprises a calculation unit and a storage unit, wherein the calculation unit calculates the effective chlorine concentration Y of the beta-time-point subacid electrolyzed water according to an online monitoring model β The storage unit is used for recording the effective chlorine concentration Y of the subacid electrolyzed water at the beta time point β For analysis by the analysis unit.
An analysis unit for analyzing | Y β -Y β-1 Value, | Y β -Y β-1 I represents taking Y β And Y β-1 The absolute value of the difference.
Alarm unit, | Y β -Y β-1 If | is greater than the first set value, or | Y β -Y 0 When | is greater than the second set value, an alarm is given, Y 0 The standard value of the concentration of the available chlorine of the subacid electrolyzed water is shown, and the standard value is generally set according to the use scene of the available chlorine, for example, the standard value can be set to be 50mg/L for disinfecting the surface of an object, and the standard value can be set to be 30mg/L for disinfecting the skin contact of hands and the like. The first set value represents the fluctuation error of the effective chlorine concentration of the subacid electrolyzed water at the adjacent momentThe disinfection error of the skin contact of the part and the like is generally set to be 2mg/L, and the disinfection error of the environmental spraying is generally set to be 10mg/L and the like. When the first set value is exceeded, the system is not stable in operation, and each parameter of the system needs to be checked after the alarm system gives an alarm. The second set value represents a deviation from the upper limit of the standard value of the effective chlorine concentration of the slightly acidic electrolyzed water, such as disinfection by general skin contact, a concentration of 20-30mg/L is suitable if Y is 0 And if the concentration is 25, the second set value is 5mg/L, and when the alarm is received, the concentration of the effective chlorine of the effluent is not within 20-30mg/L, and shutdown inspection is also needed.
The digital display screen displays time, electrolytic current, inflow flow rate, electrolyte concentration, inflow temperature, inflow pH and effective chlorine concentration in real time, and is convenient for timely obtaining relevant data.
Taking the system of fig. 1 as an example, the following experiment was performed:
opening the subacid electrolyzed water generator, setting the water inlet flow rate of 4L/min, the water inlet temperature of 25 ℃, the water inlet pH value of 7.2, the electrolysis current of 1.7A and the electrolyte concentration of 6.0g/100mL, at this timei=1，α=1，Y = 38.101 + 40.298 I - 16.205 Q+ 1.248C - 0.303 T + 0.086 P. After the startup operation is stable, the effective chlorine concentration values at three moments are randomly obtained and are respectively 42.5, 42.3 and 42.8mg/L, 100mL of slightly acidic electrolyzed water is synchronously sampled, and the effective chlorine concentrations are respectively 42, 41.7 and 42.2mg/L through an iodometry test. Taking the data of 42.3mg/L and 41.7mg/L as an example, the difference between the two is 1.4%.
The following experiments were performed with a sampling time 3min after start-up:
example 2:
the subacid electrolyzed water generator is opened, the inflow flow rate is 4L/min, the inflow temperature is 25 ℃, the inflow pH value is 7.2, the electrolysis current is 1.7A, and the electrolyte concentration is 3.0g/100mL, the effective chlorine concentration obtained by the method is 38.6mg/L, the subacid electrolyzed water is 100mL, the effective chlorine concentration is 37.5mg/L by an iodometry test, and the difference between the two is 2.9%.
Example 3:
the subacid electrolyzed water generator is opened, the inflow flow rate is 3.2L/min, the inflow temperature is 25 ℃, the inflow pH value is 7.2, the electrolysis current is 2.1A, and the electrolyte concentration is 6.0g/100mL, the effective chlorine concentration obtained by the method is 71.4mg/L, the subacid electrolyzed water is 100mL, the effective chlorine concentration is 69.3mg/L by an iodometry test, and the difference between the two is 3.0%.
Example 4:
the subacid electrolyzed water generator is opened, the inflow flow rate is 3.2L/min, the inflow temperature is 25 ℃, the inflow pH value is 7.2, the electrolysis current is 1.6A, and the electrolyte concentration is 3.0g/100mL, the effective chlorine concentration obtained by the method is 47.5mg/L, the subacid electrolyzed water is 100mL, the effective chlorine concentration is 46.6mg/L by an iodometry test, and the difference between the two is 1.9%.
Conventionally, although the iodine method has been considered to be a method of measuring the effective chlorine concentration value with high accuracy, it is time-consuming. The test paper detection method is quick and portable, but compared with data of an iodometry method, the subjective factor has large error, and the data can fully show that: compared with the traditional iodometry, the method of the invention has the advantages of real-time online monitoring, rapidness, portability and capability of ensuring precision.
Claims (7)
1. An on-line monitoring model for effective chlorine concentration of effluent of a subacid electrolyzed water generator is characterized by comprising the following steps:
wherein:Ythe unit is mg/L of the effective chlorine concentration of the subacid electrolyzed water;
Iis the electrolytic current, with unit A;
Qthe water inlet flow rate is L/min;
Cthe unit is g/100mL and is the concentration of electrolyte;
Tthe unit is the water inlet temperature;
Pis the influent pH;
ias the first coefficient of influence, when 0 <Q＜3，iThe value is between 0.9 and 0.95; when in useQ≥3，i=1，
αIs the second influence coefficient whenC≥2.5，α=1；0＜C＜2.5，αThe value is between 0.95 and 0.98;
beta represents a time node and takes the value of positive number, Y β Represents the effective chlorine concentration Y of the slightly acidic electrolyzed water at the time point of beta.
2. The on-line monitoring model of claim 1, wherein the on-line monitoring model is as follows:
Y = 38.101 + 40.298 I - 16.205 Q + 1.248C - 0.303 T + 0.086 P
in the formula:Yeffective chlorine concentration, mg/L;Iis the electrolysis current, A;Qthe water inlet flow rate is L/min;Cthe electrolyte concentration is g/100 mL;Tthe temperature of water inlet is DEG C;Pthe pH value of the inlet water is shown.
3. A system for on-line monitoring model according to claim 1, comprising a water production part and a control part:
the water making part comprises an electrolysis system, a water inlet system and a sensor group; the electrolysis system is used for electrolyzing to generate subacid hypochlorous acid water; the water inlet system is used for mixing water with subacidity hypochlorous acid water generated by electrolysis; the sensor group comprises a plurality of sensors for respectively acquiring an inlet water temperature value, an inlet water pH value and an electrolyte concentration value;
the control part comprises a calculation unit and a storage unit, wherein the calculation unit calculates the effective chlorine concentration Y of the beta-time-point subacid electrolyzed water according to an online monitoring model β (ii) a The storage unit is used for recording the effective chlorine concentration Y of the subacid electrolyzed water at the beta time point β 。
4. The on-line monitoring system of claim 3, further comprising an analysis unit for analyzing | Y |) β -Y β-1 |，|Y β -Y β-1 I represents taking Y β And Y β-1 The absolute value of the difference.
5. The on-line monitoring system of claim 4, further comprising an alarm unit, | Y β -Y β-1 If | is greater than the first set value, or | Y β -Y 0 When | is greater than the second set value, an alarm is given, Y 0 The effective chlorine concentration standard value of the subacid electrolyzed water is represented, the first set value represents the fluctuation error of the effective chlorine concentration of the subacid electrolyzed water at the adjacent moment, and the second set value represents the deviation from the upper limit of the effective chlorine concentration standard value of the subacid electrolyzed water.
6. The on-line monitoring system of claim 3, further comprising a digital display screen for displaying in real time the time, electrolysis current, influent water flow rate, electrolyte concentration, influent water temperature, influent water pH and available chlorine concentration.
7. The on-line monitoring system of claim 3, wherein the electrolysis system comprises a peristaltic pump, an electrolysis cell and a mixer in sequence; the water inlet system sequentially comprises a water inlet electromagnetic valve and a water inlet flowmeter; the sensor group comprises an electrolyte concentration sensor, a temperature sensor and a pH sensor; the electrolyte concentration sensor is arranged in the electrolysis system, and the temperature sensor and the pH sensor are arranged in the water inlet system.
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