CN113984718A - Circulating cooling water non-phosphorus scale and corrosion inhibitor on-line measuring device and measuring method - Google Patents
Circulating cooling water non-phosphorus scale and corrosion inhibitor on-line measuring device and measuring method Download PDFInfo
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- CN113984718A CN113984718A CN202111250889.5A CN202111250889A CN113984718A CN 113984718 A CN113984718 A CN 113984718A CN 202111250889 A CN202111250889 A CN 202111250889A CN 113984718 A CN113984718 A CN 113984718A
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- cooling water
- circulating cooling
- flow cell
- corrosion inhibitor
- phosphorus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
Abstract
The invention discloses an online measuring device and a measuring method for a phosphorus-free scale and corrosion inhibitor of circulating cooling water, wherein the device comprises a sampling unit, a dosing unit and a detection and control unit; the sampling unit comprises a sampling electric valve, a flow cell and a stirrer; the sampling electric valve is communicated with a water sample inlet of the flow cell through a pipeline, and the stirrer is arranged in the flow cell; the dosing unit comprises a staining agent volumetric flask and a buffer solution volumetric flask; the staining agent volumetric flask and the buffer solution volumetric flask are respectively connected with the flow cell through a dripping pipeline; the control unit comprises an embedded controller, a light source emitter and a light sensor; the light source emitter and the light sensor are arranged at opposite positions on the flow cell; the light source emitter and the light sensor are both electrically connected with the embedded controller. The method can conveniently realize the on-line measurement of the phosphorus-free scale and corrosion inhibitor of the industrial circulating cooling water without manual intervention.
Description
Technical Field
The invention relates to the technical field of online measurement of water treatment agents in industrial circulating cooling water, in particular to an online measurement device and an online measurement method for a phosphorus-free scale and corrosion inhibitor of circulating cooling water.
Background
The industrial circulating cooling water is called as blood in an industrial production system, and the industrial circulating cooling water needs to be monitored and reasonably controlled in time during operation, otherwise scaling or corrosion of a circulating cooling water system is easily caused; once the circulating cooling water system is scaled or corroded, the production efficiency is reduced if the circulating cooling water system is slightly scaled or corroded, and production is stopped for overhaul or equipment is scrapped if the circulating cooling water system is seriously scaled or corroded. In order to avoid or slow down the scaling or corrosion of the circulating cooling water, most of the circulating cooling water systems adopt a treatment mode of adding a scale and corrosion inhibitor, and the content of the scale and corrosion inhibitor in the circulating cooling water is the key of whether the scale and corrosion inhibition effect can be achieved in the treatment mode.
With the continuous improvement of environmental protection in China in these years, the scale and corrosion inhibitor of the circulating cooling water gradually adopts a phosphorus-free formula, and instruments and equipment for monitoring the concentration of the scale and corrosion inhibitor on line by measuring the phosphorus content in the circulating cooling water are not suitable. At present, the content of the phosphorus-free scale and corrosion inhibitor in most industrial circulating cooling water systems is detected by a manual method or an indirect tracer monitoring method. Although the manual detection method is mature, the operation is complicated, detection personnel are required, the operation labor cost is increased, the detection interval is large, the content of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water cannot be monitored on line, and the monitoring lags behind the operation; indirect tracer monitoring requires the addition of a tracer to the medicament, increases the cost of the medicament, and may pollute the environment. The problems that the monitoring and the control of the circulating cooling water are not timely, the influence of human factors is large, the method is not suitable for automatic control or intelligent operation, potential safety hazards of production are formed, and even the reason can not be found after scaling or corrosion occurs.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the circulating cooling water phosphorus-free scale and corrosion inhibitor online measuring device and the circulating cooling water phosphorus-free scale and corrosion inhibitor online measuring method.
In order to achieve the purpose, the invention adopts the following technical scheme:
an online measurement device for a phosphorus-free scale and corrosion inhibitor of circulating cooling water comprises a sampling unit, a dosing unit and a detection and control unit;
the sampling unit comprises a sampling electric valve, a flow cell and a stirrer; the sampling electric valve is communicated with a water sample inlet of the flow cell through a pipeline, and the stirrer is arranged in the flow cell;
the dosing unit comprises a staining agent volumetric flask and a buffer solution volumetric flask; the staining agent volumetric flask and the buffer solution volumetric flask are respectively connected with the flow cell through pipelines;
the control unit comprises an embedded controller, a light source emitter and a light sensor; the light source emitter and the light sensor are arranged at opposite positions on the side wall of the flow cell; the light source emitter and the light sensor are electrically connected with the embedded controller;
and the sampling electric valve, the magnetic stirrer, the dyeing agent plunger pump and the buffer solution peristaltic pump are all electrically connected with the embedded controller.
As a further improvement of the invention, the light source emitter and the light sensor are arranged at the middle position of the side wall of the flow-through cell.
As a further improvement of the invention, the outlet ends of the pipelines corresponding to the volumetric flask for the coloring agent and the volumetric flask for the buffer solution are arranged at the top of the flow-through tank.
As a further improvement of the invention, the flow cell is provided with a water sample outlet, the water sample outlet is higher than the water sample inlet, and the water sample outlet is higher than the installation positions of the light source emitter and the light sensor.
As a further improvement of the invention, the flow cell is made of opaque materials, and the light source emitter and the light sensor are both waterproof and embedded in the middle of the side wall of the flow cell.
As a further improvement of the invention, the magnetic stirrer is arranged at the bottom of the flow-through tank.
As a further improvement of the invention, the stain plunger pump is a 100 muL micro plunger pump with the dispensing precision of 0.3%.
As a further improvement of the invention, a pipeline of the volumetric flask for the coloring agent is provided with a plunger pump for the coloring agent, and a pipeline of the volumetric flask for the buffer solution is provided with a peristaltic pump for the buffer solution; and the sampling electric valve and the magnetic stirrer are electrically connected with the embedded controller.
A measurement method of a circulating cooling water non-phosphorus scale and corrosion inhibitor on-line measurement device comprises the following steps:
the sampling electric valve is opened, after the water sample in the circulation pool is sufficient, the buffer solution volumetric flask and the staining agent volumetric flask are respectively and sequentially added with the buffer solution and the staining agent in the circulation pool, after the stirring reaction, the light intensity of the light emitted by the light source emitter after penetrating through the water sample of the circulating cooling water in the circulation pool is detected through the light sensor, the light intensity of the circulating cooling water replenishing water or tap water without scale and corrosion inhibitor as a blank water sample is subtracted, and then the real-time concentration of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water is calculated according to the working curve.
As a further improvement of the invention, the specific method for calculating the real-time concentration of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water according to the working curve comprises the following steps:
c＝a·(A1-A0)+b
wherein a is the slope of a working curve; a. the0The light intensity when the circulating cooling water supplementing water or tap water without the scale and corrosion inhibitor is used as a blank water sample; a. the1The intensity of the circulating cooling water containing the scale and corrosion inhibitor is the water sample; b is the intercept of the working curve.
Compared with the prior art, the invention has the following advantages:
the device realizes automatic on-line acquisition of circulating cooling water, is simple and practical, has high accuracy in measuring the content of the phosphorus-free scale and corrosion inhibitor of the circulating cooling water, can quickly obtain the content of the phosphorus-free scale and corrosion inhibitor of the circulating cooling water, and meets the monitoring task of industrial circulating cooling water. Compared with the manual measurement of the phosphorus-free scale and corrosion inhibitor of the circulating cooling water at present, the online measurement of the phosphorus-free scale and corrosion inhibitor of the circulating cooling water can be quickly and accurately realized, the error introduced by the manual measurement is reduced, the problem of the hysteresis of the monitoring of the phosphorus-free scale and corrosion inhibitor of the circulating cooling water is solved, and the automatic control or the intelligent operation of a circulating cooling water system is facilitated.
By adopting the measuring method, the circulating cooling water phosphorus-free scale and corrosion inhibitor reacts with the coloring agent, so that the measuring rapidity and accuracy of the circulating cooling water phosphorus-free scale and corrosion inhibitor are improved, the workload of an inspector is reduced, and the operation safety of industrial circulating cooling water is ensured.
Drawings
FIG. 1 is a device for on-line measurement of phosphorus-free scale and corrosion inhibitors in circulating cooling water;
FIG. 2 is a flow chart of an on-line measurement method of phosphorus-free scale and corrosion inhibitors for industrial circulating cooling water.
Wherein, 1, a staining agent reagent bottle; 2. a buffer solution reagent bottle; 3. a stain plunger pump; 4. a buffer solution peristaltic pump; 5. a magnetic stirrer; 6. a flow-through cell; 7. sampling the electric valve; 8. a light source emitter; 9. a light sensor; 10. an embedded controller.
Detailed Description
The technical solutions in the embodiments of the present invention are 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 embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the on-line measuring device for the phosphorus-free scale and corrosion inhibitor of the circulating cooling water comprises a sampling unit, a dosing unit and a detection and control unit.
Wherein the sampling unit comprises a sampling electric valve 7, a flow cell 6 and a stirrer 5; the sampling electric valve 7 is communicated with a water sample inlet of the flow cell 6 through a pipeline, and the stirrer 5 is arranged in the flow cell 5;
the dosing unit comprises a coloring agent volumetric flask 1, a coloring agent plunger pump 3, a buffer solution volumetric flask 2 and a buffer solution peristaltic pump 4; the staining agent volumetric flask 1 and the buffer solution volumetric flask 2 are respectively connected with a flow cell 6 through pipelines, a staining agent plunger pump 3 is arranged on the pipeline of the staining agent volumetric flask 1, and a buffer solution peristaltic pump 4 is arranged on the pipeline of the buffer solution volumetric flask 2;
the control unit comprises an embedded controller 10, a light source emitter 8 and a light sensor 9. The light source emitter 8 and the light sensor 9 are arranged on opposite positions of the side wall of the flow-through cell 6; the light source emitter 8 and the light sensor 9 are both electrically connected with the embedded controller 10;
and the sampling electric valve 7, the magnetic stirrer 5, the dyeing agent plunger pump 3 and the buffer solution peristaltic pump 4 are electrically connected with the embedded controller 10.
The specific working process is as follows: the sampling electric valve 7 controls a water sample to enter the flow cell 6; the staining agent plunger pump 3 quantitatively adds the staining agent in the staining agent reagent bottle 1 into the flow cell 6; quantitatively adding the buffer solution in the buffer solution reagent bottle into the flow cell 6 by the buffer solution peristaltic pump 4; and stirring and mixing the mixture by an electromagnetic stirrer 5 for 5-10 min.
The inlet of the staining agent plunger pump is connected with an indicator reagent bottle, and the outlet of the staining agent plunger pump is connected with the flow cell; the inlet of the buffer solution peristaltic pump is connected with a buffer solution reagent bottle, and the outlet of the buffer solution peristaltic pump is connected with the flow cell; the detection and control unit comprises an embedded controller, a light source emitter and a light sensor; the embedded controller is connected with the light source emitter, the light sensor, the sampling electric valve, the dyeing agent plunger pump, the buffer solution peristaltic pump and the magnetic stirrer.
The device disclosed by the invention is characterized in that an embedded controller is used for quantitatively adding a coloring agent and a buffer solution into a flow cell respectively through a coloring agent plunger pump and a buffer solution peristaltic pump, a stirring function is started, after mixing reaction is carried out for 5-10 min, the light intensity of light emitted by a light source emitter after the light penetrates through a detected solution in the flow cell is detected through an optical sensor, the light intensity of the light emitted by a circulating water replenishing water or tap water without scale and corrosion inhibitors as a blank water sample is subtracted, and then the real-time concentration of the phosphorus-free scale and corrosion inhibitors in the circulating cooling water is calculated according to a working curve.
The invention also provides a measuring method based on the circulating cooling water phosphorus-free scale and corrosion inhibitor online measuring device, which comprises the following steps:
the device uses a plunger pump and a peristaltic pump to respectively and sequentially add a coloring agent and a buffer solution into the flow cell, after mixing reaction, the light intensity of light emitted by a light source emitter after transmitting a circulating cooling water sample in the flow cell is detected through a light sensor, the transmitted light intensity of circulating water make-up water or tap water without scale and corrosion inhibitors serving as a blank water sample is subtracted, and then the real-time concentration of the phosphorus-free scale and corrosion inhibitors in the circulating cooling water is calculated according to a working curve. The method can conveniently realize the online measurement of the content of the phosphorus-free scale and corrosion inhibitor of the industrial circulating cooling water without manual intervention.
The following description will further describe an embodiment of the present invention with reference to fig. 1 and 2.
Examples
As shown in the attached drawing 1, a circulating cooling water measuring water pipe is arranged at the inlet of the sampling electric valve 7, so that the pressure of 0.1Mpa in the circulating cooling water measuring water pipe is ensured, and a water sample can dynamically flow into the flow cell 6 conveniently for online measurement.
In a preferred embodiment, the light source emitter 8 and the light sensor 9 are disposed on opposite sides of the flow cell 6, and both the light source emitter 8 and the light sensor 9 are electrically connected to the embedded controller 10.
The stain outlet plunger pump 3 and the buffer solution outlet peristaltic pump 4 are both electrically connected with the embedded controller 10.
The sampling electric valve 7 is electrically connected with the embedded controller 10.
The embedded controller 10 controls the sampling electric valve 7, the stain outlet plunger pump 3 and the buffer solution outlet peristaltic pump 4 to be opened or closed, controls the light source emitter 8 to be opened or closed, and sends deaf data signals acquired by the light sensor 9 to the embedded controller 10.
In a preferred embodiment, the flow cell 6 is made of a columnar opaque material, and the light source emitter 8 and the light sensor 9 are both waterproof and embedded in the middle of the sidewall of the flow cell 6.
The outlets of the stain plunger pump 3 and the buffer solution peristaltic pump 4 are arranged at the top of the flow cell 6. The side is provided with the water sample export on the flow cell 6, and the water sample export is higher than the water sample entry, and the water sample export is higher than the mounted position of light source emitter 8 and light sensor 9.
The stain plunger pump 3 is a 100-microliter micro plunger pump with the dispensing precision of 0.3%.
As shown in the attached figure 2, when the embedded controller 10 sends a measurement instruction, the sampling electric valve 7 is opened to flush the flow cell 6, after the water sample in the flow cell 6 is ensured to be sufficient, the coloring agent is added by the plunger pump of the coloring agent under stirring and mixing, the buffer solution is added by the peristaltic pump 4 of the buffer solution, after stirring reaction, the light source emitter 8 and the optical sensor 9 are opened simultaneously to measure the intensity of transmitted light, and after the intensity of transmitted light of a blank test is deducted, the real-time concentration of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water is calculated according to a calibrated working curve.
The method comprises the following specific steps:
after the embedded controller 10 sends out a measurement instruction, the sampling electric valve 7 is opened, the flow cell 6 is washed for 20s, the flow cell 6 is ensured to be clean, and the sampling electric valve 7 is closed after the liquid to be measured is filled in the flow cell 6.
Starting the magnetic stirrer 5, starting the stain plunger pump 3 to add 100 μ L of stain 1 into the flow cell 6, and starting the buffer solution peristaltic pump 4 to add 0.5mL of buffer solution 2 into the flow cell 6.
Stirring for 5-10 min, and simultaneously starting a light source emitter 8 and a light sensor 9 to measure transmitted light intensity A1Then deduct the transmitted light intensity A of blank test0And then, according to the calibrated working curve: c ═ a · (A)1-A0) And+ b, calculating the real-time concentration of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water.
After the result is calculated, the sampling electric valve 7 is opened, after 20 seconds of flushing, the liquid measured just before is discharged out of the flow cell 6, and then the sampling electric valve 7 is closed, so that the online measurement of the phosphorus-free scale and corrosion inhibitor is completed.
In conclusion, the device has a simple structure, can realize an automatic measurement process, and can conveniently realize the on-line measurement of the industrial circulating cooling water phosphorus-free scale and corrosion inhibitor without manual intervention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The on-line measuring device for the phosphorus-free scale and corrosion inhibitor of the circulating cooling water is characterized by comprising a sampling unit, a dosing unit and a detection and control unit;
the sampling unit comprises a sampling electric valve (7), a flow cell (6) and a stirrer (5); the sampling electric valve (7) is communicated with a water sample inlet of the flow cell (6) through a pipeline, and the stirrer (5) is arranged in the flow cell (5);
the dosing unit comprises a staining agent volumetric flask (1) and a buffer solution volumetric flask (2); the staining agent volumetric flask (1) and the buffer solution volumetric flask (2) are respectively connected with the flow cell (6) through pipelines;
the control unit comprises an embedded controller (10), a light source emitter (8) and a light sensor (9); the light source emitter (8) and the light sensor (9) are arranged on the opposite positions of the side wall of the flow cell (6); the light source emitter (8) and the light sensor (9) are electrically connected with the embedded controller (10);
and the sampling electric valve (7), the magnetic stirrer (5), the dyeing agent plunger pump (3) and the buffer solution peristaltic pump (4) are electrically connected with the embedded controller (10).
2. The on-line measuring device of the circulating cooling water phosphorus-free scale and corrosion inhibitor according to claim 1, wherein the light source emitter (8) and the light sensor (9) are arranged at the middle position of the side wall of the flow cell (6).
3. The on-line measuring device of the phosphorus-free scale and corrosion inhibitor for the circulating cooling water as claimed in claim 1, wherein the outlet ends of the pipelines corresponding to the stain volumetric flask (1) and the buffer solution volumetric flask (2) are arranged at the top of the flow cell (6).
4. The on-line measuring device of the phosphorus-free scale and corrosion inhibitor for the circulating cooling water according to claim 1, wherein a water sample outlet is arranged on the circulating pool (6), the water sample outlet is higher than the water sample inlet, and the water sample outlet is higher than the installation positions of the light source emitter (8) and the optical sensor (9).
5. The on-line measuring device of the phosphorus-free scale and corrosion inhibitor for the circulating cooling water according to claim 1, wherein the flow cell (6) is made of an opaque material, and the light source emitter (8) and the light sensor (9) are both waterproof and embedded in the middle of the side wall of the flow cell (6).
6. The circulating cooling water phosphorus-free scale and corrosion inhibitor online measuring device according to claim 1, wherein the magnetic stirrer (5) is arranged at the bottom of the flow cell (6).
7. The on-line measuring device of the circulating cooling water phosphorus-free scale and corrosion inhibitor according to claim 1, wherein the stain plunger pump (3) is a 100 μ L micro plunger pump with a distribution accuracy of 0.3%.
8. The on-line measuring device of the circulating cooling water phosphorus-free scale and corrosion inhibitor according to claim 1, characterized in that a stain plunger pump (3) is arranged on a pipeline of the stain volumetric flask (1), and a buffer solution peristaltic pump (4) is arranged on a pipeline of the buffer solution volumetric flask (2); the sampling electric valve (7) and the magnetic stirrer (5) are electrically connected with the embedded controller (10).
9. The measurement method of the circulating cooling water phosphorus-free scale and corrosion inhibitor online measurement device based on any one of claims 1 to 8 is characterized by comprising the following steps:
the sampling electric valve (7) is opened, after the water sample in the flow cell (6) is sufficient, the buffer solution peristaltic pump (4) and the coloring agent plunger pump (3) respectively and sequentially add the buffer solution and the coloring agent into the flow cell (6), after stirring and reaction, the light intensity A of the light emitted by the light source emitter (8) after transmitting the circulating cooling water sample in the flow cell is detected through the optical sensor (9)1And then calculating the real-time concentration of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water according to the working curve.
10. The measurement method of the on-line measurement device for the phosphorus-free scale and corrosion inhibitor of the circulating cooling water according to claim 9, wherein the specific method for calculating the real-time concentration of the phosphorus-free scale and corrosion inhibitor in the circulating cooling water according to the working curve comprises the following steps:
c＝a·(A1-A0)+b
wherein a is the slope of a working curve; a. the0The light intensity when the circulating cooling water supplementing water or tap water without the scale and corrosion inhibitor is used as a blank water sample; a. the1The intensity of the circulating cooling water containing the scale and corrosion inhibitor is the water sample; b is the intercept of the working curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111250889.5A CN113984718A (en) | 2021-10-26 | 2021-10-26 | Circulating cooling water non-phosphorus scale and corrosion inhibitor on-line measuring device and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111250889.5A CN113984718A (en) | 2021-10-26 | 2021-10-26 | Circulating cooling water non-phosphorus scale and corrosion inhibitor on-line measuring device and measuring method |
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| Publication Number | Publication Date |
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| CN113984718A true CN113984718A (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111250889.5A Pending CN113984718A (en) | 2021-10-26 | 2021-10-26 | Circulating cooling water non-phosphorus scale and corrosion inhibitor on-line measuring device and measuring method |
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| CN (1) | CN113984718A (en) |
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2021
- 2021-10-26 CN CN202111250889.5A patent/CN113984718A/en active Pending
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