CN217578456U - Online measurement system for pH in desulfurization wastewater softening process - Google Patents
Online measurement system for pH in desulfurization wastewater softening process Download PDFInfo
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- CN217578456U CN217578456U CN202221667449.XU CN202221667449U CN217578456U CN 217578456 U CN217578456 U CN 217578456U CN 202221667449 U CN202221667449 U CN 202221667449U CN 217578456 U CN217578456 U CN 217578456U
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Abstract
The utility model provides an online measurement system of desulfurization waste water softening process pH, belongs to desulfurization waste water treatment field, and it includes measuring unit and maintenance unit. The measuring unit comprises a sampling pipeline, a pH measuring bottle, an online pH electrode, an overflow pipeline and a sewage discharge pipeline; the pH measuring bottle is provided with a sample inlet, a sample outlet, a measuring port, a drain outlet and a cleaning water inlet; the sample inlet is arranged at the bottom of the side face and is connected with a sample inlet pipeline, the sample outlet is arranged at the upper part of the side face and is connected with an overflow pipeline, the drain outlet is arranged at the bottom and is connected with a drain pipeline, the measuring port is arranged at the top and is provided with an online pH electrode, and the cleaning water inlet is arranged at the upper part of the side face and is connected with the maintenance unit. The maintenance unit comprises a process water cleaning tank, a hydrochloric acid cleaning tank and a cleaning pipeline. The utility model discloses can provide stable pH on-line measuring and pH electrode self-cleaning among the desulfurization waste water softening process, reduce the artifical maintenance of pH electrode, facilitate for desulfurization waste water softening process control.
Description
Technical Field
The utility model belongs to desulfurization waste water treatment field relates to a desulfurization waste water softens process pH on-line measuring system.
Background
With the increasing stricter of national environmental protection policies, zero discharge of wastewater is gradually popularized in coal-fired power plants, desulfurization wastewater as high-salinity wastewater at the tail end of the power plants contains a large amount of calcium ions, magnesium ions and the like, and in order to avoid adverse effects on advanced treatment systems such as subsequent membrane concentration and the like, the hardness of calcium and magnesium in the desulfurization wastewater needs to be reduced. The sodium hydroxide-sodium carbonate double-alkali softening method is more applied due to the advantages of low sludge yield, relatively simple system and the like.
The control of the pH value in the softening process is an important index for ensuring the qualified hardness of magnesium in produced water, and for this reason, a pH online measuring instrument needs to be installed, and the common method is to install the pH measuring instrument in a magnesium removal reaction tank for online measurement, and the installation and measurement mode has more problems:
(1) The desulfurization wastewater contains more suspended solids, and has stronger scouring action on the surface of the electrode under the action of the stirrer in the reaction tank, so that the electrode is easily damaged;
(2) The precipitation reaction occurs in the reaction tank, and part of the precipitation reaction occurs on the surface of the electrode, so that frequent maintenance of the electrode is required, the electrode can only be dismantled for manual maintenance, and the risk of electrode damage is increased while the manual workload is increased.
Therefore, it is highly desirable to design an online pH measurement system for a desulfurization wastewater softening process to overcome the above problems.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model aims to provide a desulfurization waste water softens process pH on-line measuring system reduces the risk of electrode damage, reduces artifical maintenance work volume.
In order to solve the technical problem, the utility model provides a technical scheme as follows:
a desulfurization wastewater softening process pH on-line measuring system comprises a wastewater softening unit, a measuring unit and a maintenance unit;
the wastewater softening unit comprises a magnesium removal reaction tank and a calcium removal reaction tank which are sequentially connected by a pipeline;
the measuring unit comprises a sampling pipeline (1), a pH measuring bottle (2), an overflow pipeline (4) and a sewage discharge pipeline (5); the sampling pipeline (1) is led out from a pipeline between the magnesium removal reaction tank and the calcium removal reaction tank and is connected to the lower end of one side of the pH measuring bottle (2); an online pH electrode (3) is inserted into the pH measuring bottle (2);
the maintenance unit comprises a cleaning pipeline (6), a process water cleaning tank (7) and a hydrochloric acid cleaning tank (8); the process water cleaning tank (7) and the hydrochloric acid cleaning tank (8) are respectively connected with the cleaning pipeline (6) and converged into one path;
the upper end of one side of the pH measuring bottle (2) is connected to a cleaning pipeline (6), and the other side of the pH measuring bottle is connected to a trench through an overflow pipeline (4); the bottom of the pH measuring bottle (2) is connected to a trench through a sewage discharge pipeline (5).
Further, an automatic valve is arranged on the sampling pipeline (1).
Furthermore, the lower end of one side of the pH measuring bottle (2) is provided with a sample inlet (21), the upper end of the pH measuring bottle is provided with a cleaning water inlet (25), the upper end of the other side of the pH measuring bottle is provided with a sample outlet (22), the bottom of the pH measuring bottle is provided with a sewage draining outlet (24), and the top of the pH measuring bottle is provided with a measuring port (23).
Furthermore, the sample inlet (21) is connected to the sampling pipeline (1), the cleaning water inlet (25) is connected to the cleaning pipeline (6), the drain outlet (24) is connected to the drain pipeline (5), the sample outlet (22) is connected to the overflow pipeline (4), and the measuring port (23) is connected to the online pH electrode (3).
Further, the process water is stored in the process water cleaning tank (7).
Further, dilute hydrochloric acid is stored in the hydrochloric acid cleaning tank (8).
Further, the concentration of the dilute hydrochloric acid is 0.1mol/L.
Furthermore, an automatic valve is arranged on a pipeline connected with the process water cleaning tank (7) and the hydrochloric acid cleaning tank (8).
Further, the online pH electrode (3) is a composite pH electrode.
Furthermore, an automatic valve is arranged on the sewage discharge pipeline (5).
The system has two working states: measuring the running state and the cleaning maintenance state.
The measurement state operation steps are as follows:
1) Opening an automatic valve on the sampling pipeline, and allowing the desulfurization wastewater subjected to chemical adding treatment in the magnesium removal reaction tank to enter a pH measuring bottle through the sampling pipeline;
2) The online pH electrode arranged in the pH measuring bottle is used for online measuring the pH of the desulfurization wastewater, and the pH measuring bottle plays a role in buffering and reducing the scouring effect of the desulfurization wastewater on the electrode;
3) Discharging the measured desulfurization wastewater to a trench through an overflow pipeline;
after a period of time of on-line measurement operation, due to accumulation and sedimentation of suspended solids, the electrodes and the pH measuring bottle need to be cleaned and maintained, and the cleaning and maintenance state steps are as follows:
1) Closing the automatic valve on the sampling pipeline, and opening the automatic valve on the sewage discharge pipeline to exhaust the desulfurization wastewater in the sampling bottle;
2) Closing an automatic valve on a sewage discharge pipeline, opening an automatic outlet valve of a process water cleaning tank on a cleaning pipeline, washing the electrode and the measuring bottle by using process water to remove solid attachments, and then closing the automatic valve;
3) Opening an outlet automatic valve of a hydrochloric acid cleaning box on a cleaning pipeline to enable the dilute hydrochloric acid to reach the liquid level of an overflow port, closing the automatic valve, soaking for a period of time, opening the automatic valve on a drain pipeline, and discharging waste acid in the measuring bottle;
4) And opening an automatic outlet valve of the process water cleaning tank on the cleaning pipeline, and fully cleaning the electrode and the measuring bottle until the pH measurement data on line is 6-8.
After cleaning and maintenance, the device can be put into measurement operation again.
Compared with the prior measuring mode, the utility model discloses following beneficial effect has:
the bypass measuring bottle is adopted for measurement, so that the scouring effect of the desulfurization wastewater containing more suspended solids on the electrode under the action of the stirrer is avoided, and the service life of the electrode is prolonged; the pH measuring bottle has a buffering effect, and reduces the scouring effect of the desulfurization wastewater on the electrode; in order to solve the problem that the electrode is easy to be polluted and needs frequent manual maintenance, the maintenance unit is arranged to realize remote cleaning and pickling maintenance of the electrode, and the workload of manual maintenance is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the system structure of the present invention; wherein, 1, sampling pipeline; 2. a pH measuring bottle; 3. an online pH electrode; 4. an overflow line; 5. a blowdown pipeline; 6. cleaning a pipeline; 7. washing a tank by using process water; 8. a hydrochloric acid cleaning box; 11/51/61/62, automatic valve;
FIG. 2 is a schematic diagram of a pH measuring flask, wherein 21 is a sample inlet; 22. a sample outlet; 23. a measurement port; 24. a sewage draining port; 25. and cleaning the water inlet.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and the present invention is not limited thereto at all.
Examples
As shown in FIG. 1, an online pH measuring system for a desulfurization wastewater softening process comprises a wastewater softening unit, a measuring unit and a maintenance unit.
The wastewater softening unit comprises a magnesium removal reaction tank and a calcium removal reaction tank which are sequentially connected through a pipeline.
The measuring unit comprises a sampling pipeline 1, a pH measuring bottle 2, an overflow pipeline 4 and a sewage discharge pipeline 5. The sampling pipeline 1 is led out from a pipeline between the magnesium removal reaction tank and the calcium removal reaction tank and is connected to the lower end of one side of the pH measuring bottle 2 to form a bypass. An online pH electrode 3 is inserted into the pH measuring bottle 2, and the online pH electrode 3 is a composite pH electrode.
The maintenance unit comprises a cleaning pipeline 6, a process water cleaning tank 7 and a hydrochloric acid cleaning tank 8; the process water cleaning tank 7 and the hydrochloric acid cleaning tank 8 are respectively connected with the cleaning pipeline 6 and converged into one path. The process water washing tank 7 stores process water therein. The hydrochloric acid cleaning box 8 stores dilute hydrochloric acid, and the concentration of the dilute hydrochloric acid is 0.1mol/L.
The lower end of one side of the pH measuring bottle 2 is provided with a sample inlet 21, the upper end of the pH measuring bottle is provided with a cleaning water inlet 25, the upper end of the other side of the pH measuring bottle is provided with a sample outlet 22, the bottom of the pH measuring bottle is provided with a sewage outlet 24, and the top of the pH measuring bottle is provided with a measuring port 23. The sample inlet 21 is connected to the sampling pipeline 1, the cleaning water inlet 25 is connected to the cleaning pipeline 6, the drain outlet 24 is connected to the drain pipeline 5, the sample outlet 22 is connected to the overflow pipeline 4, and the measuring port 23 is connected to the online pH electrode 3.
The sampling pipeline 1, the sewage draining pipeline 5 and the pipeline connected with the process water cleaning tank 7 and the hydrochloric acid cleaning tank 8 are all provided with automatic valves.
The utility model provides a system have two kinds of states, measure running state and wash the maintenance state.
The measurement run steps were as follows:
1) Starting an automatic valve 11 on a sampling pipeline 1, and allowing the desulfurization wastewater after the magnesium removal reaction tank is subjected to chemical adding treatment to enter a pH measuring bottle 2 through the sampling pipeline 1;
2) The online pH electrode 3 arranged in the pH measuring bottle 2 is used for online measuring the pH of the desulfurization wastewater, and meanwhile, the pH measuring bottle 3 plays a role in buffering and reducing the scouring effect of the desulfurization wastewater on the electrode;
3) The measured desulfurization wastewater is discharged to a trench through an overflow pipeline 4.
After a period of on-line measurement operation, due to accumulation and sedimentation of suspended solids, the electrodes and the pH measuring bottle 2 need to be cleaned and maintained, and the cleaning and maintenance steps are as follows:
1) Closing the automatic valve 11 on the sampling pipeline 1, opening the automatic valve 51 on the sewage discharge pipeline 5, and discharging the desulfurization wastewater in the sampling bottle;
2) Closing the automatic valve 51 on the sewage discharge pipeline 5, opening the automatic valve 61 at the outlet of the process water cleaning tank on the cleaning pipeline 6, washing the electrode and the measuring bottle by using the process water to remove solid attachments, and then closing the automatic valve 61;
3) Opening an outlet automatic valve 62 of a hydrochloric acid cleaning tank on the cleaning pipeline 6 to enable the dilute hydrochloric acid to reach the liquid level of an overflow port, closing the automatic valve 62, soaking for a period of time, opening an automatic valve 51 on the sewage discharge pipeline 5, and discharging the waste acid in the measuring bottle;
4) And opening an outlet automatic valve 61 of the process water cleaning tank on the cleaning pipeline 6, and fully cleaning the electrode and the measuring bottle until the online pH measuring data is 6-8.
After cleaning and maintenance, the device can be put into measurement operation again.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The on-line pH measuring system for the desulfurization wastewater softening process is characterized by comprising a wastewater softening unit, a measuring unit and a maintaining unit;
the wastewater softening unit comprises a magnesium removal reaction tank and a calcium removal reaction tank which are sequentially connected by a pipeline;
the measuring unit comprises a sampling pipeline (1), a pH measuring bottle (2), an overflow pipeline (4) and a sewage discharge pipeline (5); the sampling pipeline (1) is led out from a pipeline between the magnesium removal reaction tank and the calcium removal reaction tank and is connected to the lower end of one side of the pH measuring bottle (2); an online pH electrode (3) is inserted into the pH measuring bottle (2);
the maintenance unit comprises a cleaning pipeline (6), a process water cleaning tank (7) and a hydrochloric acid cleaning tank (8); the process water cleaning tank (7) and the hydrochloric acid cleaning tank (8) are respectively connected with the cleaning pipeline (6) and converged into one path;
the upper end of one side of the pH measuring bottle (2) is connected to a cleaning pipeline (6), and the other side of the pH measuring bottle is connected to a trench through an overflow pipeline (4); the bottom of the pH measuring bottle (2) is connected to a trench through a sewage discharge pipeline (5).
2. The on-line pH measuring system according to claim 1, characterized in that an automatic valve is arranged on the sampling line (1).
3. The on-line pH measuring system according to claim 1, wherein the lower end of one side of the pH measuring bottle (2) is provided with a sample inlet (21), the upper end is provided with a cleaning water inlet (25), the upper end of the other side is provided with a sample outlet (22), the bottom is provided with a sewage outlet (24), and the top is provided with a measuring port (23).
4. The on-line pH measurement system according to claim 3, wherein the sample inlet (21) is connected to the sampling line (1), the wash water inlet (25) is connected to the wash line (6), the drain (24) is connected to the drain line (5), the sample outlet (22) is connected to the overflow line (4), and the measurement port (23) is connected to the on-line pH electrode (3).
5. The on-line pH measurement system according to claim 1, characterized in that the process water washing tank (7) stores process water therein.
6. The on-line pH measurement system according to claim 1, wherein the hydrochloric acid purge tank (8) stores dilute hydrochloric acid therein.
7. The on-line pH measurement system according to claim 6, wherein the concentration of the dilute hydrochloric acid is 0.1mol/L.
8. The on-line pH measuring system according to claim 1, characterized in that automatic valves are provided on the pipes connected to the process water washing tank (7) and the hydrochloric acid washing tank (8).
9. The on-line pH measurement system according to claim 1, characterized in that the on-line pH electrode (3) is a composite pH electrode.
10. The on-line pH measuring system according to claim 1, wherein an automatic valve is provided on the sewage line (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221667449.XU CN217578456U (en) | 2022-06-29 | 2022-06-29 | Online measurement system for pH in desulfurization wastewater softening process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221667449.XU CN217578456U (en) | 2022-06-29 | 2022-06-29 | Online measurement system for pH in desulfurization wastewater softening process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217578456U true CN217578456U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221667449.XU Active CN217578456U (en) | 2022-06-29 | 2022-06-29 | Online measurement system for pH in desulfurization wastewater softening process |
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| CN (1) | CN217578456U (en) |
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- 2022-06-29 CN CN202221667449.XU patent/CN217578456U/en active Active
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