CN212609740U - Automatic measuring device for concentration of polyaluminium chloride diluted solution in water works - Google Patents
Automatic measuring device for concentration of polyaluminium chloride diluted solution in water works Download PDFInfo
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- CN212609740U CN212609740U CN202020927124.5U CN202020927124U CN212609740U CN 212609740 U CN212609740 U CN 212609740U CN 202020927124 U CN202020927124 U CN 202020927124U CN 212609740 U CN212609740 U CN 212609740U
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Abstract
The utility model discloses an automatic measuring device of water works polyaluminium chloride dilute solution concentration, it is including the polyaluminium chloride stoste liquid reserve tank that connects gradually through the pipeline, polyaluminium chloride solution dilution pool and diluent discharge valve, be provided with sampling pipeline and sampling switch valve between polyaluminium chloride stoste liquid reserve tank and the diluent discharge valve, be provided with the conductivity detector who is used for detecting the solution conductivity between sampling switch valve and the diluent discharge valve, be provided with between polyaluminium chloride solution dilution pool and the diluent discharge valve and dilute the pond and go out the liquid valve, the conductivity detector is located simultaneously and dilutes between pond play liquid valve and the diluent discharge valve, the conductivity detector is connected with PLC processing module. The utility model discloses an increase one set of conductivity measurement appearance and a plurality of electric ball valve and a plurality of pipeline in original pipeline, can real-time detection dilute the back gather aluminium chloride conductivity value, calculate the effective concentration who dilutes the back gather aluminium chloride in real time, throw with gather aluminium chloride for accurate automation and provide reliable guarantee.
Description
The technical field is as follows:
the utility model relates to the technical field of water treatment, in particular to an automatic measuring device for the concentration of polyaluminium chloride diluted solution in a water works.
Background art:
in recent years, with the improvement of the living standard of people, the requirements of people on tap water are higher and higher, the coagulating sedimentation is an important link in the production of the tap water, and the accurate addition of the coagulant can not only control the turbidity of water to be filtered to ensure the water quality, but also reduce the medicine consumption and save the production cost. Because the production of tap water is influenced by the water consumption of a pipe network, the water intake of a water plant is often several times of the water consumption at the valley during the peak period of water consumption, so the amount of coagulant added during the production of the water plant changes along with the change of the peak and the valley of the yield, and in consideration of the change of the unit dosage of the coagulant added in different water qualities, in the production of the tap water, a metering pump for adding often cannot meet the change range of the coagulant adding amount, and the coagulant is usually required to be diluted and added. In the process of coagulant dilution, the problems that the proportion of the coagulant to water is difficult to accurately control, the dilution rate is often adjusted and the like cause great influence on the accurate addition of the coagulant, and occasionally, the problem of 'reverse pond' caused by unknown concentration of the diluted coagulant is discovered. In order to ensure the accurate feeding of the coagulant, a simple monitoring device capable of monitoring the concentration of the diluted coagulant needs to be explored. At present, more water plants use polyaluminium chloride as a coagulant for tap water production, the concentration of the polyaluminium chloride is generally measured by titration in a laboratory, the operation is time-consuming, and the water plants are difficult to arrange that the polyaluminium chloride is diluted every time and then the polyaluminium chloride is produced and added after the concentration is measured.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
the utility model aims to overcome the defects of the prior art and provide an automatic measuring device for the concentration of polyaluminium chloride diluted solution in a water plant.
In order to solve the technical problem, the utility model discloses a following technical scheme: the automatic measuring device for the concentration of the polyaluminium chloride diluted solution in the tap water plant comprises a polyaluminium chloride stock solution storage tank, a polyaluminium chloride solution diluting tank and a diluted solution discharge valve which are sequentially connected through pipelines, wherein a sampling pipeline and a sampling switch valve are arranged between the polyaluminium chloride stock solution storage tank and the diluted solution discharge valve, a conductivity detector for detecting the conductivity of the solution is arranged between the sampling switch valve and the diluted solution discharge valve, a diluted tank liquid outlet valve is arranged between the polyaluminium chloride solution diluting tank and the diluted solution discharge valve, the conductivity detector is simultaneously positioned between the diluted tank liquid outlet valve and the diluted solution discharge valve, and the conductivity detector is connected with a PLC processing module.
Further, in the above technical scheme, the polyaluminium chloride solution dilution tank is further connected with a tap water dilution pipeline, and a stock solution switch valve is arranged between the polyaluminium chloride stock solution storage tank and the polyaluminium chloride solution dilution tank.
Further, in the above technical scheme, a liquid return pipeline and a liquid return switch valve which are connected with the polyaluminium chloride solution dilution tank are arranged between the conductivity detector and the diluent discharge valve.
Further, in the above technical scheme, a cleaning pipeline and a cleaning switch valve for cleaning the conductivity detector are arranged between the tap water dilution pipeline and the conductivity detector.
Furthermore, in the above technical scheme, the cleaning switch valve, the sampling switch valve, the diluting pool liquid outlet valve and the polyaluminium chloride solution diluting pool share a first measuring pipeline, a liquid return pipeline and a liquid return switch valve, and the conductivity detector is arranged on the first measuring pipeline.
Further, in the above technical solution, the conductivity detector is connected to the diluent discharge valve through a liquid discharge pipeline; the polyaluminium chloride stock solution storage tank is connected with the polyaluminium chloride solution dilution tank through a liquid outlet pipeline, and the stock solution switch valve is arranged on the liquid outlet pipeline; and a dilution switch valve is arranged on the tap water dilution pipeline.
Further, in the above technical solution, the concentration of the diluted polyaluminium chloride solution satisfies the following relation:
Wherein, C is related to the conductivity detector, and different conductivity meters have different corresponding C values and need to be obtained by field debugging and measurement.
After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: in the utility model, a conductivity detector for measuring the conductivity of the solution is arranged on the pipeline between the polyaluminium chloride solution diluting pool and the diluent discharge valve, a sampling pipeline and a sampling switch valve are additionally arranged between the polyaluminium chloride stock solution storage tank and the conductivity detector, measuring the conductivity of the polyaluminium chloride stock solution in the polyaluminium chloride stock solution storage tank and the diluted solution in the polyaluminium chloride solution dilution tank by a conductivity detector, analyzing and processing the measured data by a PLC processing module, so as to realize the real-time detection of the conductivity value of the diluted polyaluminium chloride and the real-time calculation of the effective concentration of the diluted polyaluminium chloride, provide reliable guarantee for accurately and automatically adding the polyaluminium chloride, and only one set of conductivity measuring instrument, a plurality of electric ball valves and a plurality of pipelines need to be added, so that the modification cost is low, the later maintenance cost is low, and the method is suitable for the modification of the water supply treatment process of the tap water plant in China.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 shows experimental data on the relationship that the concentration of the diluted polyaluminum chloride solution satisfies.
Description of reference numerals:
dilution switch valve of tap water dilution pipeline 101 of 1 polyaluminium chloride stock solution storage tank 10
Liquid outlet pipeline of 3 stock solution switch valves of 2 polyaluminium chloride solution dilution tank
4 sampling switch valve 41 sampling pipeline 5 cleaning switch valve
Discharge valve for liquid outlet valve 7 of dilution pool of 51 cleaning pipeline 6
71 first measuring pipeline of conductivity detector 81 of liquid discharge pipeline 8
9 return liquid switching valve 91 return liquid pipeline
The specific implementation mode is as follows:
the present invention will be further described with reference to the following specific embodiments and accompanying drawings.
As shown in fig. 1, the device for automatically measuring the concentration of a diluted solution of polyaluminum chloride in a water works comprises a stock solution tank 1 of polyaluminum chloride, a dilution tank 2 of polyaluminum chloride and a diluent discharge valve 7 which are sequentially connected through a pipeline, wherein a sampling pipeline 41 and a sampling switch valve 4 are arranged between the stock solution tank 1 of polyaluminum chloride and the diluent discharge valve 7, a conductivity detector 8 for detecting the conductivity of the solution is arranged between the sampling switch valve 4 and the diluent discharge valve 7, a diluent discharge valve 6 is arranged between the dilution tank 2 of polyaluminum chloride and the diluent discharge valve 7, the conductivity detector 8 is simultaneously arranged between the diluent discharge valve 6 of the dilution tank and the diluent discharge valve 7, and the conductivity detector 8 is connected with a PLC processing module. The sampling switch valve 4, the diluting pool liquid outlet valve 6 and the diluting liquid discharge valve 7 are all electrically operated valves. The conductivity detector 8 is an on-line conductivity meter. When the polyaluminium chloride solution is prepared by diluting in the polyaluminium chloride solution diluting pool 2, the conductivity values of the polyaluminium chloride stock solution and the diluted solution are measured successively, the data and the concentration data of the polyaluminium chloride stock solution are sent to the PLC processing module together, and the dilution ratio and the concentration of the diluted polyaluminium chloride solution are automatically calculated by the PLC processing module and displayed on an upper computer.
The polyaluminium chloride solution diluting pool 2 is also connected with a tap water diluting pipeline 10, and a stock solution switch valve 3 is arranged between the polyaluminium chloride stock solution storage pool 1 and the polyaluminium chloride solution diluting pool 2. The stock solution switch valve 3 is an electric valve.
A liquid return pipeline 91 and a liquid return switch valve 9 which are connected with the polyaluminium chloride solution dilution tank 2 are arranged between the conductivity detector 8 and the diluent discharge valve 7. The liquid return switch valve 9 is an electric valve.
A cleaning pipeline 51 and a cleaning switch valve 5 for cleaning the conductivity detector 8 are arranged between the tap water dilution pipeline 10 and the conductivity detector 8. The cleaning switch valve 5 is an electric valve.
A first measuring pipeline 81, a liquid return pipeline 91 and a liquid return switch valve 9 are shared among the cleaning switch valve 5, the sampling switch valve 4, the diluting pool liquid outlet valve 6 and the polyaluminium chloride solution diluting pool 2, and the conductivity detector 8 is arranged on the first measuring pipeline 81.
The conductivity detector 8 is connected with the diluent discharge valve 7 through a liquid discharge pipeline 71; the polyaluminium chloride stock solution storage tank 1 is connected with the polyaluminium chloride solution dilution tank 2 through a solution outlet pipeline 31, and the stock solution switch valve 3 is arranged on the solution outlet pipeline 31; the tap water dilution pipeline 10 is provided with a dilution switch valve 101.
According to long-term monitoring, the conductivity value of the polyaluminium chloride stock solution with the effective concentration of 10% is relatively stable, generally 120-130 mS/cm, the conductivity of factory water is generally 3 orders of magnitude lower than that of the polyaluminium chloride stock solution, the conductivity value of the diluted polyaluminium chloride solution has certain correlation with the conductivity and dilution rate of the polyaluminium chloride stock solution with the concentration of 10%, and therefore, as long as the conductivity of the polyaluminium chloride solution with the concentration of 10% and the conductivity value of the polyaluminium chloride solution after dilution are measured, the dilution rate and the solution concentration of the diluted polyaluminium chloride can be calculated through corresponding relations.
FIG. 2 shows experimental data obtained from measurement experiments performed to determine the correlation between the conductivity value of the diluted polyaluminum chloride solution and the conductivity and dilution ratio of the polyaluminum chloride stock solution with 10% concentration. The following conclusions can be drawn from the multiple measurements of the conductivity of the stock solution and the diluted conductivity,
the concentration of the diluted polyaluminium chloride solution satisfies the relation:
Wherein, C is related to the conductivity detector, and different conductivity meters have different corresponding C values and need to be obtained by field debugging and measurement.
From experimental data, it can be known that the dilution ratio is necessarily related to the conductivity of the stock solution and the conductivity of the diluted solution, and therefore, the dilution ratio can be known by measuring the conductivity of the stock solution and the conductivity of the diluted solution, so that the solubility of the diluted solution can be obtained.
To sum up, the utility model discloses during operation, when needing to dilute the liquid preparation, at first measure former liquid conductivity value, open sampling ooff valve 4 and liquid return ooff valve 9 again, the polyaluminium chloride former liquid in polyaluminium chloride former liquid storage tank 1 flows through conductivity detector 8 through sampling pipeline 41 and measures, and the polyaluminium chloride former liquid flows into polyaluminium chloride dilution tank 2 through liquid return pipeline 91 and liquid return ooff valve 9 after the measurement; after the conductivity measurement of the polyaluminium chloride stock solution is completed, closing the sampling switch valve 4 and opening the cleaning switch valve 5, allowing tap water to flow through the conductivity detector 8 through the additionally arranged cleaning pipeline 51 and the cleaning switch valve 5 to clean a probe of the conductivity meter, and allowing the cleaned water to flow into the polyaluminium chloride dilution tank 2 through the liquid return pipeline 91 and the liquid return switch valve 9; and preparing a polyaluminium chloride diluted solution: closing the cleaning switch valve 5 and the liquid return switch valve 9, opening the stock solution switch valve 3 according to the requirement of the dilution rate of the polyaluminium chloride, enabling the polyaluminium chloride stock solution in the polyaluminium chloride stock solution storage tank 1 to flow into the polyaluminium chloride solution dilution tank 2 through the liquid outlet pipeline 31, closing the stock solution switch valve 3 when the liquid level of the polyaluminium chloride solution dilution tank 2 reaches a set height, simultaneously opening the dilution switch valve 101, enabling tap water to flow into the polyaluminium chloride solution dilution tank 2 through the tap water dilution pipeline 10, simultaneously mixing and stirring the polyaluminium chloride solution dilution tank 2, and closing the dilution switch valve 101 when the liquid level of the polyaluminium chloride solution dilution tank 2 reaches the set height; after the solution preparation of the polyaluminium chloride solution diluting pool 2 is finished, a diluting pool liquid outlet valve 6 is opened, the diluted polyaluminium chloride solution flows through a conductivity detector 8 through a first measuring pipeline 81 to measure the conductivity value of the diluted solution, then the diluted polyaluminium chloride solution is sent to a metering pump liquid inlet pipeline through a liquid outlet pipeline 71 and a diluent liquid outlet valve 7, a PLC controller automatically calculates the concentration of the diluted polyaluminium chloride according to the polyaluminium chloride raw liquid measured by the conductivity detector and the diluted conductivity value, and automatically calculates the real-time adding amount according to the production process requirements to control the metering and adding.
In the scheme, the concentration of the diluted polyaluminium chloride solution can be automatically measured by only adding one set of conductivity measuring instrument, four electric ball valves and a plurality of pipelines, the modification cost is low, the later maintenance cost is low, the effective concentration of the diluted polyaluminium chloride can be calculated in real time by detecting the conductivity value of the diluted polyaluminium chloride in real time, the reliable guarantee is provided for accurate and automatic feeding of the polyaluminium chloride, and the method is suitable for the modification of the water supply treatment process of water works in China.
Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. An automatic measuring device for concentration of polyaluminium chloride diluted solution in a tap water plant comprises a polyaluminium chloride stock solution storage tank (1), a polyaluminium chloride solution dilution tank (2) and a diluent discharge valve (7) which are sequentially connected through a pipeline, and is characterized in that a sampling pipeline (41) and a sampling switch valve (4) are arranged between the polyaluminium chloride stock solution storage tank (1) and the diluent discharge valve (7), an electric conductivity detector (8) for detecting the electric conductivity of the solution is arranged between the sampling switch valve (4) and the diluent discharge valve (7), a diluent outlet valve (6) is arranged between the polyaluminium chloride solution dilution tank (2) and the diluent discharge valve (7), and the electric conductivity detector (8) is simultaneously positioned between the diluent outlet valve (6) and the diluent discharge valve (7), and the conductivity detector (8) is connected with the PLC processing module.
2. The automatic measuring device for the concentration of the polyaluminum chloride diluted solution in the water works according to claim 1, characterized in that: the polyaluminium chloride solution diluting pool (2) is also connected with a tap water diluting pipeline (10), and a stock solution switch valve (3) is arranged between the polyaluminium chloride stock solution storage pool (1) and the polyaluminium chloride solution diluting pool (2).
3. The automatic measuring device for the concentration of the polyaluminium chloride diluted solution in the water works according to the claim 2, wherein: a liquid return pipeline (91) and a liquid return switch valve (9) which are connected with the polyaluminium chloride solution dilution pool (2) are arranged between the conductivity detector (8) and the diluent discharge valve (7).
4. The automatic measuring device for the concentration of the polyaluminum chloride diluted solution in the water works according to claim 3, characterized in that: and a cleaning pipeline (51) and a cleaning switch valve (5) for cleaning the conductivity detector (8) are arranged between the tap water dilution pipeline (10) and the conductivity detector (8).
5. The automatic measuring device for the concentration of the polyaluminum chloride diluted solution in the water works according to claim 4, characterized in that: the cleaning switch valve (5), the sampling switch valve (4), the diluting pool liquid outlet valve (6) and the polyaluminium chloride solution diluting pool (2) share a first measuring pipeline (81), a liquid return pipeline (91) and a liquid return switch valve (9), and the conductivity detector (8) is arranged on the first measuring pipeline (81).
6. The automatic measuring device for the concentration of the polyaluminum chloride diluted solution in the water works according to claim 5, characterized in that: the conductivity detector (8) is connected with the diluent discharge valve (7) through a liquid discharge pipeline (71); the polyaluminium chloride stock solution storage tank (1) is connected with the polyaluminium chloride solution dilution tank (2) through a solution outlet pipeline (31), and the stock solution switch valve (3) is arranged on the solution outlet pipeline (31); and a dilution switch valve (101) is arranged on the tap water dilution pipeline (10).
7. The automatic measuring device for the concentration of the polyaluminium chloride diluted solution in the water works according to any one of claims 1 to 6, wherein: the concentration of the diluted polyaluminium chloride solution satisfies the relation:
y 10%/((conductivity value of stock solution-conductivity value after dilution) 2/conductivity value after dilution C +1)
Wherein, C is related to the conductivity detector, and different conductivity meters have different corresponding C values and need to be obtained by field debugging and measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020927124.5U CN212609740U (en) | 2020-05-27 | 2020-05-27 | Automatic measuring device for concentration of polyaluminium chloride diluted solution in water works |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020927124.5U CN212609740U (en) | 2020-05-27 | 2020-05-27 | Automatic measuring device for concentration of polyaluminium chloride diluted solution in water works |
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| Publication Number | Publication Date |
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| CN212609740U true CN212609740U (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020927124.5U Active CN212609740U (en) | 2020-05-27 | 2020-05-27 | Automatic measuring device for concentration of polyaluminium chloride diluted solution in water works |
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| CN (1) | CN212609740U (en) |
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