PH detection system

Abstract

The utility model provides a pH detection system which comprises a to-be-detected liquid inlet pipeline, a flushing pipeline, a pH detection water tank and a protection liquid tank, the protection liquid tank is used for storing protection liquid, the output end of the to-be-detected liquid inlet pipeline and the output end of the flushing pipeline are connected with the pH detection water tank, and a flow detection device is arranged on the to-be-detected liquid inlet pipeline. The output end of the protection liquid water tank is connected with the pH detection water tank through a protection liquid water tank output pipeline; a pH detection device is arranged in the pH detection water tank, a liquid level detection device is arranged on the side wall of the pH detection water tank, and a liquid discharge pipeline is arranged at the bottom of the pH detection water tank; a first electrically operated gate is installed on the protection liquid tank output pipeline, and a second electrically operated gate is installed on the liquid discharging pipeline. According to the utility model, the protection liquid tank can inject the protection liquid into the pH detection water tank in a stopped state according to the feedback of the liquid level detection device and the flow detection device, so that the off-line protection of the pH detection device is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pH detection, in particular to a pH detection system. Background Art

[0002] The wet flue gas desulfurization system is a treatment technology for removing acidic gases in industrial waste gas, mainly removing SO2, HCl, and HF in flue gas. The pH detection system is an important part of controlling the stable and efficient operation of the wet flue gas desulfurization system. Although the existing pH detection systems can meet the daily operation requirements, when the wet flue gas desulfurization system stops operating, the pH meter will still continue to be immersed in the detection solution for ineffective detection and cannot perform self-maintenance. Over time, it will seriously affect its service life and accuracy. Once the pH meter is distorted, it will directly affect the normal operation of the wet flue gas desulfurization system. When the pH meter shows positive distortion (the detected value is higher than the actual value), the alkali addition time will be delayed, the acidity in the wet scrubber will increase, the corrosion of the inner wall of the wet scrubber will intensify, and the desulfurization efficiency will decrease; when the pH meter shows negative distortion (the detected value is lower than the actual value), the alkali addition time will be advanced, the alkalinity in the wet scrubber will increase. Although the desulfurization effect of the wet flue gas desulfurization system can be improved at this time, the consumption of liquid alkali and the production of waste water will also increase, and when the temperature is relatively high, the solution is likely to scale in the pipeline, thus increasing the operation and maintenance costs. Therefore, improving the accuracy and service life of the pH meter is of great significance for the efficient operation of the wet flue gas desulfurization system. Content of the Utility Model

[0003] The purpose of the utility model is to solve the problem of improving the accuracy and service life of the pH detection device, and provide a pH detection system.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A pH detection system, comprising:

[0006] A pipeline for incoming liquid to be measured, a flushing pipeline, a pH detection water tank, and a protective liquid water tank;

[0007] The input end of the pipeline for incoming liquid to be measured is used for inputting the liquid to be measured, the input end of the flushing pipeline is used for inputting the flushing liquid, the protective liquid water tank is used for storing the protective liquid, the output ends of the pipeline for incoming liquid to be measured and the flushing pipeline are connected to the pH detection water tank, a flow detection device is arranged on the pipeline for incoming liquid to be measured, and the output end of the protective liquid water tank is connected to the pH detection water tank through the output pipeline of the protective liquid water tank;

[0008] A pH detection device is arranged inside the pH detection water tank, a liquid level detection device is arranged on the side wall of the pH detection water tank, and a liquid discharge pipeline is arranged at the bottom of the pH detection water tank;

[0009] A first electric valve is installed on the output pipeline of the protective liquid water tank, and a second electric valve is installed on the drainage pipeline.

[0010] In some embodiments, a first opening and closing valve, a second opening and closing valve, a flow detection device, and a check valve are sequentially arranged from the input end to the output end of the pipeline for the liquid to be measured.

[0011] In some embodiments, a third opening and closing valve is arranged on the flushing pipeline, and the output end of the flushing pipeline is arranged between the first opening and closing valve and the second opening and closing valve.

[0012] In some embodiments, the protective liquid water tank is connected to the flushing pipeline through a protective liquid water tank flushing pipeline. The input end of the protective liquid water tank flushing pipeline is arranged between the input end of the flushing pipeline and the third opening and closing valve. A sewage discharge pipeline is arranged at the bottom of the protective liquid water tank. A fourth opening and closing valve is arranged on the protective liquid water tank flushing pipeline, and a fifth opening and closing valve is arranged on the sewage discharge pipeline.

[0013] In some embodiments, the bottom of the protective liquid water tank is higher than the top of the pH detection water tank, so that the protective liquid in the protective liquid water tank can be replenished into the pH detection water tank only by gravity.

[0014] In some embodiments, the drainage pipeline includes a first drainage sub-pipeline and a second drainage sub-pipeline arranged in parallel. A sixth opening and closing valve is arranged on the first drainage sub-pipeline, and a second electric valve is arranged on the second drainage sub-pipeline.

[0015] In some embodiments, an overflow water tank is further included. The pH detection water tank and the overflow water tank are arranged in parallel. The overflow water tank is used for the overflow of the pH detection water tank when it is full. The output end of the overflow water tank is connected with a third drainage sub-pipeline.

[0016] In some embodiments, the output end of the third drainage sub-pipeline is connected to the output ends of the first drainage sub-pipeline and the second drainage sub-pipeline through a main drainage pipeline. A seventh opening and closing valve is arranged on the main drainage pipeline.

[0017] In some embodiments, a control device is further included. The control device is respectively connected to the first electric valve, the second electric valve, the liquid level detection device, and the flow detection device.

[0018] The utility model has the following beneficial effects:

[0019] The utility model realizes the offline protection of the pH detection device by setting a protective liquid water tank, a flow detection device on the incoming liquid pipeline of the liquid to be measured, a liquid level detection device on the side wall of the pH detection water tank, a first electric valve installed on the output pipeline of the protective liquid water tank, and a second electric valve installed on the liquid discharge pipeline, enabling the protective liquid water tank to inject the protective liquid into the pH detection water tank in the deactivated state according to the feedback of the liquid level detection device and the flow detection device. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a pH detection system in the prior art;

[0021] Figure 2 is a schematic structural diagram of the pH detection system in the embodiment of the utility model;

[0022] Figure 3 is a schematic structural diagram of the pH detection water tank in the embodiment of the utility model;

[0023] Description of the Reference Numerals:

[0024] 1 - pH meter, 2 - pH detection water tank, 3 - first on-off valve, 4 - sixth on-off valve, 5 - seventh on-off valve, 6 - third on-off valve, 7 - liquid level gauge, 8 - second on-off valve, 9 - check valve, 10 - second electric valve, 11 - protective liquid water tank, 12 - eighth on-off valve, 13 - first electric valve, 14 - fourth on-off valve, 15 - fifth on-off valve, 16 - incoming liquid flowmeter, 17 - overflow water tank. Detailed Embodiment

[0025] The following makes a detailed description of the embodiments of the utility model. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the utility model.

[0026] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. Additionally, the connection can be for a fixing function or for a coupling or communication function.

[0027] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the utility model.

[0028] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the embodiments of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0029] Reference Figure 1 , the operation mode of the prior art pH detection device is as follows:

[0030] pH detection device operation: The liquid to be measured enters the pH detection water tank through the first on-off valve 3 for detection. After the water tank is full, it overflows into the overflow water tank and then enters other pipelines through the seventh on-off valve 5.

[0031] Pipeline and pH detection device flushing: Close the first on-off valve 3, open the manual liquid outlet door of the pH detection chamber (the sixth on-off valve 4), open the third on-off valve 6 to clean the pipeline and the pH detection chamber. After flushing is completed, close the third on-off valve 6, and after draining, close the sixth on-off valve 4. The flushing is completed.

[0032] The technical core of the embodiments of the present utility model is to add an automatic pH meter protection liquid replenishment system on the basis of the original pH detection system, inject a certain amount of pH meter protection liquid (3M potassium chloride) into the pH buffer tank in the deactivated state, realize the off-line protection of the pH meter, and achieve the purpose of slowing down the aging of the pH meter and extending the service life of the pH meter.

[0033] Reference Figures 2 - 3 , specifically, the pH detection system of the embodiments of the present utility model includes:

[0034] The liquid inlet pipeline for the liquid to be measured, the flushing pipeline, the pH detection water tank 2, and the protection liquid water tank 11;

[0035] The input end of the liquid inlet pipeline for the liquid to be measured is used for inputting the liquid to be measured, the input end of the flushing pipeline is used for inputting the flushing liquid, the protection liquid water tank 11 is used for storing the protection liquid, the output end of the liquid inlet pipeline for the liquid to be measured and the output end of the flushing pipeline are connected to the pH detection water tank 2. A flow detection device is provided on the liquid inlet pipeline for the liquid to be measured. The output end of the protection liquid water tank 11 is connected to the pH detection water tank 2 through the protection liquid water tank output pipeline. In this embodiment, the flow detection device is specifically the inlet flow meter 16;

[0036] A pH detection device is arranged inside the pH detection water tank 2, a liquid level detection device is arranged on the side wall of the pH detection water tank 2, and a liquid discharge pipeline is arranged at the bottom of the pH detection water tank 2. In this embodiment, the pH detection device is the pH meter 1, and the liquid level detection device is specifically the liquid level meter 7;

[0037] A first electric valve 13 is installed on the output pipeline of the protective liquid water tank, and a second electric valve 10 is installed on the liquid discharge pipeline.

[0038] In this embodiment, a first on-off valve 3, a second on-off valve 8, a liquid inlet flowmeter 16, and a check valve 9 are sequentially arranged from the input end to the output end of the liquid to be measured inlet pipeline. A third on-off valve 6 is arranged on the flushing pipeline, and the output end of the flushing pipeline is arranged between the first on-off valve 3 and the second on-off valve 8.

[0039] In this embodiment, the protective liquid water tank 11 is connected to the flushing pipeline through the protective liquid water tank flushing pipeline. The input end of the protective liquid water tank flushing pipeline is arranged between the input end of the flushing pipeline and the third on-off valve 6. A sewage discharge pipeline is arranged at the bottom of the protective liquid water tank. A fourth on-off valve 14 is arranged on the protective liquid water tank flushing pipeline, and a fifth on-off valve 15 is arranged on the sewage discharge pipeline.

[0040] In this embodiment, the bottom of the protective liquid water tank 11 is higher than the top of the pH detection water tank 2, so that the protective liquid in the protective liquid water tank can be replenished to the pH detection water tank only by gravity.

[0041] In this embodiment, the liquid discharge pipeline includes a first liquid discharge sub-pipeline and a second liquid discharge sub-pipeline arranged in parallel. A sixth on-off valve 4 is arranged on the first liquid discharge sub-pipeline, and a second electric valve 10 is arranged on the second liquid discharge sub-pipeline. The pH detection system of this embodiment further includes an overflow water tank 17. The pH detection water tank 2 and the overflow water tank 17 are arranged in parallel. The overflow water tank 17 is used for overflowing when the pH detection water tank is full. The output end of the overflow water tank 17 is connected with a third liquid discharge sub-pipeline. The output end of the third liquid discharge sub-pipeline is connected with the output ends of the first liquid discharge sub-pipeline and the second liquid discharge sub-pipeline through a liquid discharge main pipeline. A seventh on-off valve 5 is arranged on the liquid discharge main pipeline. In this embodiment, the first to seventh on-off valves are manual valves, and an eighth switch valve 12 is also installed in front of the first electric valve 13. This embodiment further includes a control device, and the control device is respectively connected to the first electric valve, the second electric valve, the liquid level detection device, and the flow detection device.

[0042] The operation mode of the pH detection system in the embodiment of the present utility model is as follows: The interlock mechanism of the present utility model includes two parts: one is that when the flow rate of the liquid inlet flowmeter is 0, the control device controls the interlock to open the liquid discharge electric valve to discharge water from the pH detection water tank; the other is the liquid level gauge interlock. When the water level is low, the control device controls the automatic interlock to open the protective liquid inlet electric valve, and when the water level is high, the control device controls the automatic interlock to close the protective liquid inlet electric valve (the specific values of the high and low water levels are set according to actual needs). Among them, the first on-off valve 3, the seventh on-off valve 5, the second on-off valve 8, and the eighth switch valve 12 are normally open manual valves, and the sixth on-off valve 4, the third on-off valve 6, the fourth on-off valve 15, and the fifth on-off valve 15 are normally closed manual valves.

[0043] The liquid to be measured is input from the liquid inlet pipeline of the liquid to be measured, passes through the first on-off valve 3, the second on-off valve 8, the inlet flowmeter 16, and the check valve 9, and enters the pH detection water tank 2 for detection. After the water tank is full, it overflows into the overflow water tank 17 and enters other pipelines through the seventh on-off valve 5.

[0044] Operation of the protective liquid: After the liquid inlet of the liquid to be measured stops, the inlet flowmeter 16 shows 0. The remote control device controls the opening of the liquid discharge electric valve (the second electric valve 10) in a chain to empty the solution in the pH detection water tank 2. When the value of the liquid level gauge 7 shows 0, the liquid discharge electric valve (the second electric valve 10) is closed in a chain. After a 5-second delay, the protective liquid inlet electric valve (the first electric valve 13) is opened in a chain to supplement the protective liquid to the pH detection water tank 2. When the solution is slightly higher than the liquid level of the pH meter 1 probe, the protective liquid inlet electric valve (the first electric valve 13) is closed in a chain. At this time, the pH meter 1 is maintained in the protective liquid (the check valve 9 prevents the protective liquid from flowing out of the inlet pipeline).

[0045] Re-operation of the pH detection device: Release interlocks one and two. The remote control device controls the opening of the liquid outlet electric valve (the second electric valve 10) of the pH detection chamber to discharge the protective liquid. When the water level indication of the liquid level gauge 7 is 0, the liquid outlet electric valve (the second electric valve 10) of the pH detection chamber is closed. Then, the infusion pump is started. The liquid to be measured passes through the manual valves (the first on-off valve 3, the second on-off valve 8), the inlet flowmeter 16, and the check valve 9 and enters the pH detection water tank for detection. After the water tank is full, it overflows into the overflow water tank and enters other pipelines through the seventh on-off valve 5. After normal operation, interlocks one and two are restored.

[0046] Flushing of the pipeline and the pH detection device: The remote control device releases interlocks one and two. Locally close the manual valve of the inlet pipeline (the second on-off valve 8), open the manual valve of the flushing pipeline (the third on-off valve 6) to flush the pipeline at the manual valve of the inlet pipeline (the first on-off valve 3). After the flushing is completed, close the manual valve of the flushing pipeline (the third on-off valve 6) to flush the other side of the pipeline. At this time, close the manual valve of the inlet pipeline (the first on-off valve 3), open the manual liquid outlet valve of the pH detection chamber (the sixth on-off valve 4), and open the manual valve of the flushing pipeline (the third on-off valve 6) to drain and flush the second on-off valve 8, the check valve 9, the pipeline, and the pH detection water tank 2. After the flushing is completed, close the manual valve of the flushing pipeline (the third on-off valve 6). After draining, close the manual liquid outlet valve of the pH detection chamber (the sixth on-off valve 4), open the manual valve of the inlet pipeline (the first on-off valve 3). After the flushing is completed, restore interlocks one and two.

[0047] Flushing of the protective liquid water tank 11: Open the blowdown valve of the high-level protective liquid water tank (the fifth switching valve 15) to collect the remaining protective liquid in the tank. After the collection is completed, close the blowdown valve of the protective liquid water tank 11 (the fifth switching valve 15), open the flushing manual valve (the fourth opening and closing valve 14) to fill the protective liquid water tank 11 with water. After the tank is full, close the flushing manual valve (the fourth opening and closing valve 14) to clean the tank. After the cleaning is completed, open the blowdown valve of the protective liquid water tank 11 (the fifth switching valve 15) for sewage discharge. After the sewage discharge is completed, close the blowdown valve of the high-level protective liquid water tank (the fifth switching valve 15). The cleaning is over. During this period, the eighth switching valve 12 remains closed until it is opened after flushing.

[0048] On the basis of the original pH detection system, the present utility model adds components such as an electric valve, a flowmeter, a liquid level gauge, and a high-level water tank. Through the real-time feedback of the flowmeter and the liquid level gauge, the electric valves of each pipeline are adjusted in a chain to inject a certain amount of pH meter protective liquid into the pH buffer tank in the deactivated state, realizing the offline protection of the pH meter. The advantages of the embodiments of the present utility model are as follows:

[0049] 1. Simple operation, and the feeding and withdrawal of the pH meter protective liquid can be remotely controlled;

[0050] 2. Cleverly utilize the chain mechanism to realize the full automation of the feeding process of the pH meter protective liquid;

[0051] 3. The pH detection system is equipped with a complete backwashing pipeline, which can realize the complete flushing of each pipeline of the system and the pH detection water tank.

[0052] The above content is a further detailed description of the present utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, they can also make several substitutions or modifications to these described embodiments, and these substitution or modification methods should all be regarded as belonging to the protection scope of the present utility model. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. A pH detection system, characterized in that, Including: The liquid to be measured inlet pipeline, the flushing pipeline, the pH detection water tank, and the protective liquid water tank; The input end of the liquid to be measured inlet pipeline is used for inputting the liquid to be measured, the input end of the flushing pipeline is used for inputting the flushing liquid, the protective liquid water tank is used for storing the protective liquid, the output ends of the liquid to be measured inlet pipeline and the flushing pipeline are connected to the pH detection water tank, a flow detection device is arranged on the liquid to be measured inlet pipeline, and the output end of the protective liquid water tank is connected to the pH detection water tank through the protective liquid water tank output pipeline; A pH detection device is arranged inside the pH detection water tank, a liquid level detection device is arranged on the side wall of the pH detection water tank, and a liquid discharge pipeline is arranged at the bottom of the pH detection water tank; A first electric valve is installed on the protective liquid water tank output pipeline, and a second electric valve is installed on the liquid discharge pipeline; 2. The pH detection system according to claim 1, wherein, A first on-off valve, a second on-off valve, a flow detection device, and a check valve are sequentially arranged from the input end of the liquid to be measured inlet pipeline to the output end of the liquid to be measured inlet pipeline; 3. The pH detection system according to claim 2, wherein A third on-off valve is arranged on the flushing pipeline, and the output end of the flushing pipeline is arranged between the first on-off valve and the second on-off valve; 4. The pH detection system according to claim 3, wherein, The protective liquid water tank is connected to the flushing pipeline through the protective liquid water tank flushing pipeline. The input end of the protective liquid water tank flushing pipeline is arranged between the input end of the flushing pipeline and the third on-off valve. A sewage discharge pipeline is arranged at the bottom of the protective liquid water tank. A fourth on-off valve is arranged on the protective liquid water tank flushing pipeline, and a fifth on-off valve is arranged on the sewage discharge pipeline; 5. The pH detection system according to claim 1, wherein The bottom of the protective liquid water tank is higher than the top of the pH detection water tank, so that the protective liquid in the protective liquid water tank can be replenished to the pH detection water tank only by gravity; 6. The pH detection system according to claim 1, wherein, The liquid discharge pipeline includes a first liquid discharge sub-pipeline and a second liquid discharge sub-pipeline arranged in parallel. A sixth on-off valve is arranged on the first liquid discharge sub-pipeline, and a second electric valve is arranged on the second liquid discharge sub-pipeline; 7. The pH detection system according to claim 6, wherein, It further includes an overflow water tank. The pH detection water tank and the overflow water tank are arranged in parallel. The overflow water tank is used for the overflow of the pH detection water tank when it is full of water. The output end of the overflow water tank is connected with a third liquid discharge sub-pipeline; 8. The pH detection system according to claim 7, characterized in that, The output end of the third liquid discharge sub-pipeline is connected to the output ends of the first liquid discharge sub-pipeline and the second liquid discharge sub-pipeline through a total liquid discharge pipeline. A seventh on-off valve is arranged on the total liquid discharge pipeline; 9. The pH detection system according to claim 1, characterized in that, It further includes a control device, and the control device is respectively connected to the first electric valve, the second electric valve, the liquid level detection device, and the flow detection device.

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