Online cleaning device for pH glass electrode in complex chemical environment

Abstract

The invention discloses an on-line cleaning device for a pH glass electrode in a complex chemical environment, the on-line cleaning device comprises a detection cavity, a pH sensor, a micro nozzle, a controller, an electromagnetic valve, an electromagnetic pump, a pipeline and a control line, the detection cavity is used for accommodating a solution to be detected, the pH sensor is arranged on an upper end cover of the detection cavity, a glass bulb electrode of the pH sensor is responsible for measuring the pH value of the solution, and the micro nozzle is arranged on the pipeline. The micro spray head is mounted on a lower end cover of the detection cavity, a glass bulb electrode is cleaned by adopting a micro spray technology and a reasonably designed structure, the controller can accurately control the working states of the electromagnetic valves and the electromagnetic pump, and the electromagnetic valves and the electromagnetic pump cooperatively work under the control of the controller to realize sampling and backflow of a to-be-detected solution. And operations such as entering and jet flow of cleaning water and waste water discharge are controlled. Three typical application schemes of continuous measurement-intermittent cleaning, air-insensitive medium intermittent measurement-intermittent cleaning and air-sensitive medium intermittent measurement-intermittent cleaning are designed, water pressure and cleaning time are accurately controlled, damage of water flow to an electrode is reduced to the maximum extent, and cleaning water is reduced as much as possible; meanwhile, key parts of the device are made of acid and alkali resistant materials, so that damage of a to-be-detected solution to the cleaning device is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical instruments, and in particular relates to an online cleaning device for a pH glass electrode in a complex chemical environment. Background Art

[0002] With the continuous improvement of the intelligent control level of energy and chemical enterprises, many enterprises are seeking to add new sensors to monitor the reaction process in real time on the basis of traditional online monitoring of temperature, pressure, flow and liquid level sensors. The pH sensor is an important monitoring indicator that can reflect whether the chemical reaction process meets the expected chemical process requirements. However, in the actual use of the pH sensor, the characteristics of the solution to be tested must be fully considered, otherwise it is likely to cause inaccurate or even large deviations in the test results. Taking the production of dimethyl sulfoxide as an example, the online monitoring of the pH sensor can only maintain the monitoring results for a short time, and then the monitoring data will show a large deviation. After repeated tests, it was found that this is because this type of pH sensor uses a glass bulb electrode, and dimethyl sulfoxide and its intermediate products constitute a complex chemical environment, that is, an environment containing highly soluble, permeable, and highly oxidizing chemical substances. The electrode material is easy to interact with this type of chemical substance, causing the electrode performance to change. Therefore, in this type of use environment, the pH electrode must be cleaned in real time to meet the online testing requirements.

[0003] Disadvantages of existing technology:

[0004] The existing pH electrode cleaning methods mainly include water cleaning, ultrasonic cleaning, mechanical brushing, etc. For chemical companies, the simplest and most maintainable online cleaning method is water cleaning. However, the existing water cleaning methods either do not consider the protective effect of the glass bulb cover, waste a lot of water during the cleaning process, bring burdens to the chemical company's sewage treatment, and increase the company's operating costs; or do not consider the damage of water pressure jets to the glass bulb, resulting in a significant reduction in the service life of the pH sensor, increasing the company's re-purchase and maintenance costs; or do not consider the interaction between substances and cleaning devices in the complex chemical environment in actual chemical use, affecting the actual use effect. Summary of the invention

[0005] In view of the problems and limitations of the existing pH electrode cleaning methods in complex chemical environments, the present invention provides an online cleaning device for pH glass electrodes in complex chemical environments, which uses micro-spray technology and a reasonably designed structure to clean glass bulb electrodes. By accurately controlling the water pressure and cleaning time, the damage to the electrode caused by the water flow is minimized, and the service life of the electrode is extended; the amount of cleaning water is reduced as much as possible, and the pressure of sewage treatment is reduced. At the same time, the key components of the device are made of acid and alkali resistant materials to prevent the test solution from damaging the cleaning device and affecting the cleaning effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an online cleaning device for pH glass electrodes in a complex chemical environment, comprising a detection chamber, a pH sensor, a micro-spray head, a controller, a solenoid valve, an electromagnetic pump, a pipeline and a control line, wherein the detection chamber is used to contain a solution to be tested, the pH sensor is installed on the upper end cover of the detection chamber, the glass bulb electrode of the pH sensor is responsible for measuring the pH value of the solution, the micro-spray head is installed on the lower end cover of the detection chamber, and the micro-spray head is aimed at the glass bulb electrode for micro-spray flushing, and the water spray height of the micro-spray head can just cover the glass bulb electrode by finely adjusting the opening of the solenoid valve and the flushing pressure of the electromagnetic pump. The working state of each solenoid valve and electromagnetic pump is precisely controlled by the controller, including the opening and closing state of the solenoid valve and the electromagnetic pump, the opening of the solenoid valve, the pressure of the electromagnetic pump, the working time, etc. The solenoid valve and the electromagnetic pump work together under the control of the controller to realize the sampling and reflux of the solution to be tested, as well as the control of the spraying of the cleaning water and the discharge of waste water.

[0007] Preferably, the present invention provides three technical solutions for typical application scenarios. The first is that it is necessary to continuously obtain pH parameters during a chemical reaction process, and the glass bulb motor is cleaned after measuring for a period of time. In this case, Scheme 1, continuous measurement-intermittent cleaning scheme, is used; the second is that it is necessary to obtain pH parameters once at intervals during a chemical reaction process. At this time, the electrode can be cleaned once after obtaining one or more pH parameters. At the same time, if the solution to be tested is not sensitive to the outside air, the pressure difference generated during the fluid movement can be compensated by connecting with the outside air. In this case, Scheme 2, air-insensitive medium intermittent measurement-intermittent cleaning scheme is used; the third measurement and cleaning process is similar to Scheme 2, but the substance in the solution to be tested is sensitive to the outside atmosphere and needs to be isolated from the air. In this case, Scheme 3, air-sensitive medium intermittent measurement-intermittent cleaning scheme is used.

[0008] Regarding the continuous measurement-intermittent cleaning scheme of Scheme 1 of the present invention, the measurement process is as follows: open the solution sampling solenoid valve, and the solution to be tested passes through the solution sampling tube, the solution sampling solenoid valve, and the solution injection tube from the outlet main pipeline of the reactor into the detection chamber. After a short period of time, the liquid level of the solution to be tested in the detection chamber completely immerses the glass bulb electrode of the pH sensor, and the pH value can be detected. The detection result is transmitted back to the central control system through the controller. At the same time, open the solution reflux solenoid valve and the reflux solenoid pump, so that the solution to be tested passes through the detection chamber outlet pipe, the reflux solenoid pump, the reflux solenoid valve, and the solution reflux pipe and returns to the reactor main pipeline. By adjusting the opening of the solution sampling solenoid valve and the solution reflux solenoid valve, as well as the outlet water pressure of the reflux solenoid pump, the fluid of the solution to be tested entering the detection chamber and returning to the reactor main pipeline can flow smoothly, and the liquid level of the solution in the detection chamber remains unchanged. In this operating mode, the pH sensor can continuously measure the solution in the reactor main pipeline.

[0009] After continuous measurement for a period of time, the glass bulb electrode needs to be cleaned. The cleaning process is as follows: first close the solution sampling solenoid valve, stay for a short time, close the solution reflux solenoid valve, close the reflux solenoid pump, open the sewage solenoid valve, and discharge the residual solution in the detection chamber to the sewage treatment pool through the sewage solenoid valve. Open the water intake solenoid valve, turn on the flushing solenoid pump, and enter the micro-spray flushing state. Clean water flows from the water intake pipe, through the water intake solenoid valve, flushing solenoid pump, and the detection chamber water inlet pipe, into the micro-spray head in the detection chamber, and the micro-spray head is aimed at the glass bulb electrode for micro-spray flushing. Before using the cleaning device, the water outlet pressure and water outlet height must be debugged. By finely adjusting the opening of the water intake solenoid valve and the flushing pressure of the flushing solenoid pump, the water outlet of the micro-spray head can just cover the height of the glass bulb electrode to avoid the pressure being too low to reach the glass bulb electrode, or the pressure being too high to damage the glass bulb electrode. The water spray height of the micro-sprinkler can cover the glass bulb electrode, and can also clean the sensor that may be placed near the electrode. This installation method avoids the barrier of the pH bulb cap and can clean the inside of the glass bulb cap, reducing the inaccuracy of pH value measurement caused by solution residue. The wastewater after cleaning is discharged to the sewage treatment pool through the sewage discharge solenoid valve.

[0010] Preferably, the detection chamber is used to contain the solution to be detected and the cleaning water, and the sealing structure composed of the main body detection chamber, the detection chamber upper end cover, the detection chamber lower end cover and the detection chamber fastening bolts prevents the air from reacting with the liquid to be detected. The pH sensor and the detection chamber inlet are installed on the detection chamber upper end cover, the micro-sprinkler is installed on the detection chamber lower end cover, and the detection chamber discharge port on the detection chamber lower end cover is connected to the detection chamber water outlet pipe.

[0011] Preferably, the controller is used to control the solution sampling solenoid valve, solution reflux solenoid valve, water intake solenoid valve, sewage discharge solenoid valve, reflux solenoid pump, and flushing solenoid pump. The controller is also used to control the spray time, solution injection amount, cleaning time, cleaning times, detection and cleaning processes.

[0012] Preferably, the micro-sprinkler adopts a pressure jet atomization water spraying mode. Under the pressure of the flushing electromagnetic pump, the cleaning water is squeezed into the tiny circular spray hole. The cleaning water is ejected from the spray hole under the action of pressure, and the formed jet breaks into tiny droplets in the air, thereby achieving a relatively uniformly distributed cleaning atomized water layer. The micro-sprinkler is a corrosion-resistant micro-sprinkler that will not react with chemicals containing strong solubility, permeability, and strong oxidizing properties.

[0013] Preferably, the detection chamber and all solenoid valves, solenoid pumps, pipelines, and connectors must be made of corrosion-resistant materials. It is possible to consider using tetrafluoroethylene-coated solenoid valves, solenoid pumps, pipelines, and connectors, such as polytetrafluoroethylene coatings, Teflon coatings, etc., which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties.

[0014] Regarding the intermittent measurement-intermittent cleaning scheme of air-insensitive media in Scheme 2 of the present invention, the measurement process is as follows: open the solution sampling solenoid valve, start the two-way electromagnetic pump and set it to a fluid transmission mode to the lower end tube of the electromagnetic pump, at which time the water intake solenoid valve and the sewage discharge solenoid valve are in a closed state, and the solution to be tested enters the detection chamber from the solution sampling tube through the solution sampling solenoid valve, the three-way connector, the upper end tube of the electromagnetic pump, the two-way electromagnetic pump, the lower end tube of the electromagnetic pump, and the micro-sprinkler with reflux. After the liquid level of the solution to be tested in the detection chamber continues to rise to immerse the glass bulb electrode, the solution sampling solenoid valve and the two-way electromagnetic pump are closed to stabilize the liquid level of the solution to be tested in the detection chamber, and the pH value of the solution to be tested is measured by the pH sensor, and the measurement result is transmitted back to the central control system through the controller. After one measurement is completed, start the bidirectional electromagnetic pump and set it to the mode of fluid transmission to the upper end tube of the electromagnetic pump, open the solution sampling electromagnetic valve, and transport the solution in the detection chamber back to the reactor main pipeline through the micro-sprinkler with reflux, the lower end tube of the electromagnetic pump, the bidirectional electromagnetic pump, the upper end tube of the electromagnetic pump, the three-way connector, the solution sampling electromagnetic valve, and the solution sampling tube. After the solution is completely returned, close the solution sampling electromagnetic valve and the bidirectional electromagnetic pump. If another measurement is required, repeat the above process.

[0015] After the measurement process is completed, the glass bulb electrode needs to be cleaned. The cleaning process is to open the water intake solenoid valve, start the two-way solenoid pump and set it to the fluid transmission mode to the lower end tube of the solenoid pump. The cleaning water enters the detection chamber from the water intake pipe, through the water intake solenoid valve, the three-way connector, the upper end tube of the solenoid pump, the two-way solenoid pump, the lower end tube of the solenoid pump, and the micro-sprinkler with reflux. The opening of the water intake solenoid valve and the water pressure of the two-way solenoid pump are adjusted to make the jet water entering the detection chamber 1 in a micro-spray state. The water spray state is similar to that of scheme 1. After one micro-spray cleaning is completed, the two-way solenoid pump and the water intake solenoid valve are closed, and the sewage discharge solenoid valve is opened. The wastewater after cleaning is discharged to the sewage treatment pool through the guide pipe, the drain pipe, and the sewage discharge solenoid valve. After the cleaning wastewater is discharged, the sewage discharge solenoid valve is closed. The above process can be repeated for multiple cleanings.

[0016] Preferably, the micro-sprinkler with reflux can switch the functions of liquid injection and liquid discharge under control. When the bidirectional electromagnetic pump applies pressure to the micro-sprinkler with reflux, the liquid enters the liquid injection chamber from the guide tube. Under the upward pressure of the liquid, the one-way check valve is closed, and the liquid can only be sprayed out from the spray hole without backflow. When the bidirectional electromagnetic pump applies pressure in the direction of the upper end tube of the electromagnetic pump, or when the bidirectional electromagnetic pump is closed and the sewage discharge electromagnetic valve is opened, the solution in the liquid injection chamber no longer has an upward thrust. At the same time, the solution in the detection chamber is affected by gravity or the downward pulling force of the bidirectional electromagnetic pump, and the one-way check valve opens. The solution in the detection chamber is discharged downward along the liquid discharge chamber and the guide tube. The liquid inflow and outflow of the detection chamber are achieved under control.

[0017] Preferably, in order to balance the pressure difference during the liquid entering and flowing out of the detection chamber, an air hole is opened on the upper end cover of the detection chamber to communicate with the outside atmosphere and compensate for the pressure difference during the liquid transportation process. This method requires that the solution to be tested will not interact with the air and is suitable for the detection of air-insensitive media, i.e., the solution to be tested.

[0018] Preferably, the solution sampling solenoid valve, the two-way solenoid pump, the water intake solenoid valve and the sewage discharge solenoid valve are controlled by a controller. The controller is also used to control the spraying time, the solution injection amount, the cleaning time, the cleaning times, the detection and cleaning processes.

[0019] Preferably, in order to facilitate the natural flow of liquid in the pipe under the influence of gravity, the lower end of the electromagnetic pump is designed to have a certain tilt angle in the horizontal direction, and the bidirectional electromagnetic pump end is slightly higher. The drain pipe is designed to have a certain tilt angle in the horizontal direction, and the sewage discharge electromagnetic valve end is slightly lower. This design allows the water to flow naturally into the sewage treatment pool when the cleaning wastewater is discharged, without the need for the electromagnetic pump to provide additional boost pressure, and also ensures that no liquid remains in the pipe wall after the detection process and the cleaning process are completed.

[0020] Preferably, the detection cavity and all electromagnetic valves, electromagnetic pumps, pipelines, and connectors here should be made of corrosion-resistant materials. It is possible to consider using tetrafluoroethylene-coated electromagnetic valves, electromagnetic pumps, pipelines, and connectors, such as polytetrafluoroethylene coatings, Teflon coatings, etc., which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties. The micro-sprinkler with reflux uses a corrosion-resistant micro-sprinkler, which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties.

[0021] Compared with Solution 1, Solution 2 reduces one solenoid valve, one solenoid pump and some pipelines, thus reducing the cost. This solution can be used preferentially when high-density data measurement is not required.

[0022] Regarding the intermittent measurement and intermittent cleaning scheme of air-sensitive media in Scheme 3 of the present invention, compared with Scheme 2, the air hole is replaced with the nitrogen pipe access end, and the pressure difference during the liquid entering and flowing out of the detection cavity is balanced by supplementing nitrogen. In this scheme, the detection cavity is a sealed structure, isolated from the air, and is used for air-sensitive media, that is, the solution to be tested may interact with the air, and the detection and cleaning need to be isolated from the air. Application scenarios. Other technical details are the same as Scheme 2.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. In the structural design, the protective effect of the glass bulb cover on the glass bulb electrode is taken into consideration. The cleaning nozzle is precisely aligned with the glass bulb electrode from bottom to top, avoiding the barrier effect of the glass bulb cover on the cleaning of the glass bulb electrode.

[0025] 2. The controller is used to accurately control the electromagnetic pump and electromagnetic valve, and micro-spray technology is used to avoid damage to the glass bulb electrode caused by excessive cleaning water pressure during the cleaning process. The cleaning device fully protects the glass bulb electrode and extends its service life.

[0026] 3. The amount of cleaning water can be precisely controlled through the controller, which can significantly reduce the amount of cleaning water and reduce the cost of sewage treatment.

[0027] 4. The cleaning device has the ability to resist complex chemical environments such as strong solubility, permeability, and strong oxidation, and can be used stably for a long time in such environments.

[0028] 5. The cleaning device is small in size and light in weight, making it easy to install and maintain on site.

[0029] 6. Design different measurement and cleaning plans according to the company's measurement time interval requirements, and further reduce the amount of equipment and equipment costs without the need for overly intensive pH value collection.

[0030] 7. Refine and differentiate the solutions to be tested into air-sensitive media and air-insensitive media, and provide technical solutions for them respectively, accurately configure enterprise needs and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] Figure 1 This is a schematic diagram of the overall structure of a typical usage method in an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the local structure of the micro-sprinkler cleaning glass bulb electrode in the embodiment of the present application;

[0034] Figure 3 This is a schematic diagram of the continuous measurement-intermittent cleaning scheme in the embodiment of the present application;

[0035] Figure 4 This is a schematic diagram of an intermittent measurement-intermittent cleaning scheme for air-insensitive media in an embodiment of the present application;

[0036] Figure 5 Schematic diagram of the intermittent measurement and intermittent cleaning scheme for air-sensitive media in an embodiment of the present application.

[0037] Figure 1 1-detection chamber, 2-pH sensor, 3-controller, 4-wastewater treatment tank, 5-reactor, 201-glass bulb electrode, 301-micro sprinkler;

[0038] Figure 2 202—pH ball bubble, 301A—micro-sprinkler water spraying state, 301B—micro-sprinkler side view, 110—cleaning atomization layer, 111—spray hole;

[0039] Figure 3 102—detection chamber upper end cover, 103—detection chamber lower end cover, 104—detection chamber fastening bolts, 302—solution sampling solenoid valve, 304—solution reflux solenoid valve, 305—water intake solenoid valve, 306—drainage solenoid valve, 307—reflux solenoid pump, 308—flushing solenoid pump, 309—solenoid valve and solenoid pump control line, 310—control line trough, 601—reactor main pipeline, 602—solution sampling tube, 603—solution injection tube, 604—detection chamber outlet pipe, 605—solution reflux pipe, 606—water intake pipe, 607—detection chamber inlet pipe, 1A—detection chamber internal structure diagram, 608—detection chamber injection port, 608B—detection chamber outlet;

[0040] Figure 4 105—air hole, 303—bidirectional electromagnetic pump, 609—three-way connector, 610—upper end pipe of electromagnetic pump, 611—lower end pipe of electromagnetic pump, 612—drain pipe, 301B—micro sprinkler with reflux, 1B—internal structure diagram of 301B, 1B-1—liquid injection state, 1B-2—liquid discharge state, 106—liquid injection chamber, 107—liquid discharge chamber, 108—one-way check valve, 109—flow guide pipe;

[0041] Figure 5 Middle 613—Nitrogen pipe access end. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] The present invention provides an online cleaning device for a pH glass bulb electrode in a complex chemical environment. First, a solution to be tested is taken from a reactor 5 and introduced into a detection chamber 1. The pH value of the solution to be tested is detected by a pH sensor, and the data result is transmitted to a central control system of a production enterprise through a controller 3. On the basis of this detection, the online cleaning is carried out by the controller 3 to accurately control the working state of the electromagnetic valve and the electromagnetic pump, adjust the outlet pressure and time of the micro-spray head 301, and realize online micro-spray cleaning of the glass bulb electrode 201. The waste liquid after cleaning enters a sewage treatment tank 4.

[0044] Here are three typical application scenario embodiments of the present invention. The first is that the pH parameter needs to be continuously obtained during the chemical reaction process, and the glass bulb motor is cleaned after measuring for a period of time. In this case, Scheme 1, continuous measurement-intermittent cleaning scheme, is used; the second is that the pH parameter needs to be obtained once at intervals during the chemical reaction process. At this time, the electrode can be cleaned once after obtaining one or more pH parameters. At the same time, if the solution to be tested is not sensitive to the outside air, the pressure difference generated during the fluid movement can be compensated by connecting with the outside air. In this case, Scheme 2, air-insensitive medium intermittent measurement-intermittent cleaning scheme is used; the third measurement and cleaning process is similar to Scheme 2, but the substance in the solution to be tested is sensitive to the outside atmosphere and needs to be isolated from the air. In this case, Scheme 3, air-sensitive medium intermittent measurement-intermittent cleaning scheme is used.

[0045] Example 1

[0046] Regarding the continuous measurement-intermittent cleaning scheme of scheme 1 of the present invention, refer to Figure 1 , Figure 2 and Figure 3 The measurement process is as follows: the solution sampling solenoid valve 302 is opened, and the solution to be tested enters the detection chamber 1 from the outlet main pipeline 601 of the reactor 5 through the solution sampling tube 602, the solution sampling solenoid valve 302, and the solution injection tube 603. After a short period of time, the glass bulb electrode 201 of the pH sensor 2 is completely immersed in the liquid level of the solution to be tested in the detection chamber, and the pH value can be detected. The detection result is transmitted back to the central control system through the controller 3. At the same time, the solution reflux solenoid valve 304 and the reflux solenoid pump 307 are opened, so that the solution to be tested returns to the reactor main pipeline 601 through the detection chamber outlet pipe 604, the reflux solenoid pump 307, the reflux solenoid valve 304, and the solution reflux pipe 605. By adjusting the opening of the solution sampling solenoid valve 302 and the solution reflux solenoid valve 304, as well as the water outlet pressure of the reflux solenoid pump 307, the fluid of the solution to be tested entering the detection chamber 1 and returning to the reactor main pipeline 601 can flow smoothly, and the liquid level height of the solution in the detection chamber 1 remains unchanged. In this operating mode, the pH sensor can continuously measure the solution in the reactor main pipeline 601.

[0047] After continuous measurement for a period of time, the glass bulb electrode 201 needs to be cleaned. The cleaning process is as follows: first, the solution sampling electromagnetic valve 302 is closed, and after a short period of time, the solution reflux electromagnetic valve 304 is closed, the reflux electromagnetic pump 307 is closed, and the sewage discharge electromagnetic valve 306 is opened to discharge the residual solution in the detection chamber to the sewage treatment pool 4 through the sewage discharge electromagnetic valve 306. The water intake electromagnetic valve 305 is opened, and the flushing electromagnetic pump 308 is turned on to enter the micro-spray flushing state. Clean water flows from the water intake pipe 606, passes through the water intake electromagnetic valve 305, the flushing electromagnetic pump 308, and the detection chamber water inlet pipe 607, and enters the micro-spray head 301 in the detection chamber 1, and the micro-spray head 301 is aimed at the glass bulb electrode 201 for micro-spray flushing. Figure 2 301B is a side view of the micro-sprinkler. Before using the cleaning device, the water outlet pressure and water outlet height should be adjusted. By finely adjusting the opening of the water intake solenoid valve 305 and the flushing pressure of the flushing solenoid pump 308, the water outlet of the micro-sprinkler can just cover the height of the glass bulb electrode 201, avoiding the glass bulb electrode being damaged due to too little pressure or too much pressure. Figure 2 301A in the figure shows the water spraying state of the micro-sprinkler, which can cover the glass bulb electrode 201 and can also clean the sensor that may be placed near the electrode. This installation method avoids the obstruction of the pH bulb cap 202 and can clean the inside of the glass bulb cap, reducing the inaccuracy of pH value measurement caused by solution residue. The wastewater after cleaning is discharged to the sewage treatment pool 4 through the sewage discharge solenoid valve 306.

[0048] The detection chamber is used to hold the solution to be detected and the cleaning water. The sealing structure composed of the main detection chamber 1, the detection chamber upper end cover 102, the detection chamber lower end cover 103 and the detection chamber fastening bolts 104 prevents the air from reacting with the liquid to be detected. 1A is a diagram of the internal structure of the detection chamber, the pH sensor 2 and the detection chamber inlet 608 are installed on the detection chamber upper end cover 102, the micro-sprinkler 301 is installed on the detection chamber lower end cover 103, and the detection chamber outlet 608B on the detection chamber lower end cover 103 is connected to the detection chamber outlet pipe 604.

[0049] The controller 3 controls the solution sampling solenoid valve 302 , the solution reflux solenoid valve 304 , the water intake solenoid valve 305 , the sewage discharge solenoid valve 306 , the reflux solenoid pump 307 , and the flushing solenoid pump 308 . 309 is a connected control line, and 310 is a wire slot for placing the control line 309 .

[0050] Here is an example of a typical control process, for example, the controller 3 controls the measurement process described above, performs continuous measurement for half an hour, then stops the measurement process and enters the cleaning process. The controller 3 controls the cleaning process described above, and can be set to be rinsed by the micro-sprinkler 301 for 20 seconds, the water pressure is set between 0.1 and 0.3 MPa, paused for 5 seconds, and the above-mentioned flushing process is repeated 3 times. Then enter the measurement process, and repeat the cycle. The specific measurement time, cleaning time and water pressure can be adjusted according to the user's measurement requirements and the difficulty of cleaning the solution to be tested.

[0051] The detection cavity and all solenoid valves, solenoid pumps, pipelines, and connectors here must be made of corrosion-resistant materials. You can consider using tetrafluoroethylene-coated solenoid valves, solenoid pumps, pipelines, and connectors, such as polytetrafluoroethylene coatings, Teflon coatings, etc., which will not react with chemicals that are highly soluble, permeable, and oxidizing.

[0052] The micro-sprinkler 301 adopts a pressure jet atomization water spraying method. Under the pressure of the flushing electromagnetic pump 308, the cleaning water is squeezed into the tiny circular spray hole 111. The cleaning water is ejected from the spray hole 111 under the pressure, and the formed jet breaks into tiny droplets in the air, thereby achieving a relatively evenly distributed cleaning atomized water layer 110. The micro-sprinkler 301 uses a corrosion-resistant micro-sprinkler and will not react with chemical substances containing strong solubility, permeability, and strong oxidizing properties.

[0053] Example 2

[0054] Regarding the intermittent measurement-intermittent cleaning scheme of air-insensitive medium in scheme 2 of the present invention, refer to Figure 1 and Figure 4 The measurement process is as follows: the solution sampling solenoid valve 302 is opened, the two-way solenoid pump 303 is started and set to a fluid transmission mode to the lower end tube 611 of the solenoid pump. At this time, the water intake solenoid valve 305 and the sewage discharge solenoid valve 306 are in a closed state, and the solution to be tested enters the detection chamber 1 from the solution sampling tube 602 through the solution sampling solenoid valve 302, the three-way connector 609, the upper end tube 610 of the solenoid pump, the two-way solenoid pump 303, the lower end tube 611 of the solenoid pump, and the micro-sprinkler 301B with reflux. After the liquid level of the solution to be tested in the detection chamber 1 continues to rise to immerse the glass bulb electrode 201, the solution sampling solenoid valve 302 and the two-way solenoid pump 303 are closed to stabilize the liquid level of the solution to be tested in the detection chamber 1, and the pH value of the solution to be tested is measured by the pH sensor 2, and the measurement result is transmitted back to the central control system through the controller 3.

[0055] After one measurement is completed, the two-way electromagnetic pump 303 is started and set to the mode of fluid transmission to the upper end tube 610 of the electromagnetic pump, and the solution sampling electromagnetic valve 302 is opened to transport the solution in the detection chamber 1 back to the reactor main pipeline 601 through the micro-sprinkler 301B with reflux, the lower end tube 611 of the electromagnetic pump, the two-way electromagnetic pump 303, the upper end tube 610 of the electromagnetic pump, the three-way connector 609, the solution sampling electromagnetic valve 302, and the solution sampling tube 602. After the solution is completely returned, the solution sampling electromagnetic valve 302 is closed, and the two-way electromagnetic pump 303 is closed. If another measurement is required, the above process is repeated.

[0056] After the measurement process is completed, the glass bulb electrode 201 needs to be cleaned. The cleaning process is as follows: open the water intake solenoid valve 305, start the two-way solenoid pump 303 and set it to the fluid transmission mode to the lower end tube 611 of the solenoid pump. The cleaning water enters the detection chamber 1 from the water intake pipe 606, through the water intake solenoid valve 305, the three-way connector 609, the upper end tube 610 of the solenoid pump, the two-way solenoid pump 303, the lower end tube 611 of the solenoid pump, and the micro-sprinkler 301B with reflux. Adjust the opening of the water intake solenoid valve 305 and the water pressure of the two-way solenoid pump 303 so that the jet water entering the detection chamber 1 is in a micro-spraying state, and the water spraying state is similar to 301A. After a micro-spraying cleaning is completed, close the two-way solenoid pump 303 and the water intake solenoid valve 305, open the sewage discharge solenoid valve 306, and the wastewater after cleaning is discharged to the sewage treatment pool 4 through the guide pipe 109, the drainage pipe 612, and the sewage discharge solenoid valve 306. After the cleaning wastewater is discharged, close the sewage discharge solenoid valve 306. The above process can be repeated for multiple cleanings.

[0057] Figure 4 301B is a micro-sprinkler with reflux, and its internal structure is shown in Figure 1B. When the bidirectional electromagnetic pump 303 applies pressure to the micro-sprinkler with reflux 301B, the liquid enters the liquid injection chamber 106 from the guide tube 109. Under the upward pressure of the liquid, the one-way check valve 108 is closed, and the liquid can only be sprayed out from the spray hole without backflow. When the bidirectional electromagnetic pump 303 applies pressure to the direction of the upper end tube 610 of the electromagnetic pump, or when the bidirectional electromagnetic pump 303 is closed and the sewage discharge electromagnetic valve 306 is opened, the solution in the liquid injection chamber 106 no longer has an upward thrust. At the same time, the solution in the detection chamber 1 is affected by gravity or the downward pulling force of the bidirectional electromagnetic pump 303, and the one-way check valve 108 is opened. The solution in the detection chamber 1 is discharged downward along the liquid discharge chamber 107 and the guide tube 109. The liquid inlet and outlet of the detection chamber under control are realized. 1B-1 and 1B-2 respectively show the opening and closing states of the one-way check valve 108 in the liquid injection state and the liquid discharge state.

[0058] In order to balance the pressure difference during the process of liquid entering and flowing out of the detection chamber, an air hole 105 is opened on the upper end cover 102 of the detection chamber to communicate with the outside atmosphere and compensate for the pressure difference during the liquid transportation process. This method requires that the solution to be tested will not interact with the air and is suitable for the detection of air-insensitive media, i.e., the solution to be tested.

[0059] The controller 3 controls the solution sampling solenoid valve 302, the two-way solenoid pump 303, the water intake solenoid valve 305 and the sewage discharge solenoid valve 306. The control process can adopt a method of measuring once and cleaning once, or a method of cleaning once after multiple measurements. The above cleaning process can be repeated multiple times in one cleaning, which is collectively called cleaning once. During the measurement process, the opening of the solution sampling solenoid valve 302 and the pressure of the two-way solenoid pump 303 should be adjusted so that the water outlet pressure at the end of the micro-sprinkler 301B with reflux is slightly less than the pressure during cleaning, that is, when the solution to be tested enters the detection chamber, it is not necessary to perform micro-spraying, as long as the solution can be injected normally.

[0060] In order to facilitate the natural flow of liquid in the pipe under the influence of gravity, the lower end pipe 611 of the electromagnetic pump is designed to have a certain tilt angle in the horizontal direction (typical value is 5°), and the end of the two-way electromagnetic pump 303 is slightly higher. The drain pipe 612 is designed to have a certain tilt angle in the horizontal direction (typical value is 5°), and the end of the sewage discharge electromagnetic valve 306 is slightly lower. This design allows the water to flow naturally into the sewage treatment tank 4 when the cleaning wastewater is discharged, without the need for the electromagnetic pump to provide additional boosting pressure, and also ensures that no liquid remains in the pipe wall after the detection process and the cleaning process are completed.

[0061] The detection chamber and all electromagnetic valves, electromagnetic pumps, pipelines, and connectors here must be made of corrosion-resistant materials. You can consider using tetrafluoroethylene-coated electromagnetic valves, electromagnetic pumps, pipelines, and connectors, such as polytetrafluoroethylene coatings and Teflon coatings, which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties. The micro-sprinkler 301B with reflux uses a corrosion-resistant micro-sprinkler, which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties.

[0062] Compared with Solution 1, Solution 2 reduces one solenoid valve, one solenoid pump and some pipelines, thus reducing the cost. This solution can be used preferentially when high-density data measurement is not required.

[0063] Example 3

[0064] Regarding the intermittent measurement-intermittent cleaning scheme of air-sensitive medium in scheme 3 of the present invention, refer to Figure 5 .and Figure 4In comparison, the air hole 105 is replaced with the nitrogen pipe access end 613, and the pressure difference during the liquid entering and flowing out of the detection chamber is balanced by supplementing nitrogen. In this solution, the detection chamber 1 is a sealed structure isolated from the air, and is used for air-sensitive media, that is, the solution to be tested may interact with the air, and the detection and cleaning need to be isolated from the air. Other technical details are the same as Solution 2.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online cleaning device for pH glass electrodes in complex chemical environments, characterized by: It includes a detection chamber, a pH sensor, a micro-sprinkler, a controller, a solenoid valve, an electromagnetic pump, a pipeline and a control line. The detection chamber is used to contain the solution to be tested. The pH sensor is installed on the upper end cover of the detection chamber. The glass bulb electrode of the pH sensor is responsible for measuring the pH value of the solution. The micro-sprinkler is installed on the lower end cover of the detection chamber. The micro-sprinkler is aimed at the glass bulb electrode for micro-spray flushing. By finely adjusting the opening of the solenoid valve and the flushing pressure of the electromagnetic pump, the water spray height of the micro-sprinkler can just cover the glass bulb electrode. The working state of each solenoid valve and electromagnetic pump is precisely controlled by the controller, including the opening and closing state of the solenoid valve and the electromagnetic pump, the opening of the solenoid valve, the pressure of the electromagnetic pump, the working time, etc. The solenoid valve and the electromagnetic pump work together under the control of the controller to realize the sampling and reflux of the solution to be tested, as well as the control of the spraying of the cleaning water and the discharge of wastewater.

2. The online cleaning device according to claim 1, characterized in that: The device includes three technical solutions for typical application scenarios, including Solution 1, a continuous measurement-intermittent cleaning solution, which is used in chemical reactions where pH parameters need to be continuously obtained and the glass bulb electrode needs to be cleaned regularly; Solution 2, an air-insensitive medium intermittent measurement-intermittent cleaning solution, which is used in chemical reactions where pH parameters need to be obtained once at intervals, the electrode is cleaned once after obtaining one or more pH parameters, and the solution to be tested is insensitive to the outside air; Solution 3, an air-sensitive medium intermittent measurement-intermittent cleaning solution, which is used in chemical reactions where pH parameters need to be obtained once at intervals, the electrode is cleaned once after obtaining one or more pH parameters, and the solution to be tested is sensitive to the outside air.

3. The online cleaning device according to claim 2, characterized in that: The measurement process is as follows: open the solution sampling solenoid valve, and the solution to be tested enters the detection chamber from the outlet main pipeline of the reactor through the solution sampling tube, the solution sampling solenoid valve, and the solution injection tube. The liquid level of the solution to be tested in the detection chamber completely immerses the glass bulb electrode of the pH sensor for pH value detection, and the detection result is transmitted back to the central control system through the controller. At the same time, open the solution reflux solenoid valve and reflux solenoid pump, so that the solution to be tested returns to the reactor main pipeline through the detection chamber outlet pipe, reflux solenoid pump, reflux solenoid valve, and solution reflux pipe.

4. The online cleaning device according to claim 2, characterized in that: The cleaning process is to first close the solution sampling solenoid valve, stay for a short time, then close the solution reflux solenoid valve, turn off the reflux solenoid pump, open the sewage solenoid valve, and discharge the residual solution in the detection chamber into the sewage treatment tank through the sewage solenoid valve. Open the water intake solenoid valve, turn on the flushing solenoid pump, enter the micro-spray flushing state, and the clean water flows from the water intake pipe, through the water intake solenoid valve, flushing solenoid pump, and the detection chamber water inlet pipe, into the micro-spray head in the detection chamber, and the micro-spray head is aimed at the glass bulb electrode for micro-spray flushing. The waste water after cleaning is discharged to the sewage treatment pool through the sewage discharge solenoid valve.

5. The online cleaning device according to claim 2, characterized in that: The detection chamber is a sealing structure composed of a main body detection chamber, an upper end cover of the detection chamber, a lower end cover of the detection chamber and detection chamber fastening bolts, so as to prevent air from reacting with the liquid to be detected.

6. The online cleaning device according to claim 2, characterized in that: The controller is used to control the solution sampling solenoid valve, solution reflux solenoid valve, water intake solenoid valve, sewage discharge solenoid valve, reflux solenoid pump, and flushing solenoid pump. The controller is also used to control the spray time, solution injection amount, cleaning time, cleaning times, detection and cleaning processes.

7. The online cleaning device according to claim 2, characterized in that: The micro-sprinkler adopts a pressure jet atomization water spraying method. Under the pressure of the flushing electromagnetic pump, the cleaning water is squeezed into a tiny circular spray hole. The cleaning water is ejected from the spray hole under pressure. The formed jet breaks into tiny droplets in the air, thereby achieving a relatively evenly distributed cleaning atomized water layer.

8. The online cleaning device according to claim 2, characterized in that: The micro-sprinklers are corrosion-resistant and will not react with chemicals that are highly soluble, permeable, or oxidizing.

9. The online cleaning device according to claim 2, characterized in that: The detection cavity and all solenoid valves, solenoid pumps, pipelines, and connectors must be made of corrosion-resistant materials. Consider using tetrafluoroethylene-coated solenoid valves, solenoid pumps, pipelines, and connectors, such as polytetrafluoroethylene coatings, Teflon coatings, etc., which will not react with highly soluble, permeable, and oxidizing chemicals.

10. The online cleaning device according to scheme 2 of claim 2, characterized in that: The measurement process is as follows: open the solution sampling solenoid valve, start the two-way solenoid pump and set it to the fluid transmission mode to the lower end tube of the solenoid pump. At this time, the water intake solenoid valve and the sewage discharge solenoid valve are in a closed state. The solution to be tested enters the detection chamber from the solution sampling tube through the solution sampling solenoid valve, the three-way connector, the upper end tube of the solenoid pump, the two-way solenoid pump, the lower end tube of the solenoid pump, and the micro-sprinkler with reflux. After the liquid level of the solution to be tested in the detection chamber continues to rise to immerse the glass bulb electrode, close the solution sampling solenoid valve and the two-way solenoid pump to stabilize the liquid level of the solution to be tested in the detection chamber, measure the pH value of the solution to be tested through the pH sensor, and the measurement result is transmitted back to the central control system through the controller. After one measurement is completed, start the bidirectional electromagnetic pump and set it to the mode of fluid transmission to the upper end tube of the electromagnetic pump, open the solution sampling electromagnetic valve, and transport the solution in the detection chamber back to the reactor main pipeline through the reflux micro-sprinkler, the lower end tube of the electromagnetic pump, the bidirectional electromagnetic pump, the upper end tube of the electromagnetic pump, the three-way connector, the solution sampling electromagnetic valve, and the solution sampling tube. After the solution is completely returned, close the solution sampling electromagnetic valve and the bidirectional electromagnetic pump.

11. The online cleaning device according to claim 2, characterized in that: The cleaning process is to open the water intake solenoid valve, start the two-way solenoid pump and set it to the mode of fluid transmission to the lower end pipe of the solenoid pump. The cleaning water enters the detection chamber from the water intake pipe, through the water intake solenoid valve, the three-way connector, the upper end pipe of the solenoid pump, the two-way solenoid pump, the lower end pipe of the solenoid pump, and the micro-sprinkler with reflux. The opening of the water intake solenoid valve and the water pressure of the two-way solenoid pump are adjusted to make the jet water entering the detection chamber 1 in a micro-spray state. The water spray state is similar to that of Scheme 1. After a micro-spray cleaning is completed, the two-way solenoid pump and the water intake solenoid valve are closed, and the sewage solenoid valve is opened. The wastewater after cleaning is discharged to the sewage treatment pool through the diversion pipe, the drainage pipe, and the sewage solenoid valve. The sewage solenoid valve is closed after the cleaning wastewater is discharged.

12. The online cleaning device according to claim 2, characterized in that: The micro-sprinkler with reflux can switch the functions of liquid injection and liquid discharge under control. When the bidirectional electromagnetic pump applies pressure to the micro-sprinkler with reflux, the liquid enters the liquid injection chamber from the guide tube. Under the upward pressure of the liquid, the one-way check valve is closed, and the liquid can only be sprayed out from the spray hole without backflow. When the bidirectional electromagnetic pump applies pressure to the upper end tube of the electromagnetic pump, or when the bidirectional electromagnetic pump is closed and the sewage discharge electromagnetic valve is opened, the solution in the liquid injection chamber no longer has an upward thrust. At the same time, the solution in the detection chamber is affected by gravity or the downward pulling force of the bidirectional electromagnetic pump, and the one-way check valve opens. The solution in the detection chamber is discharged downward along the liquid discharge chamber and the guide tube. The liquid inflow and outflow of the detection chamber are realized under control.

13. The online cleaning device according to claim 2, characterized in that: The upper end cover of the detection cavity is provided with an air hole for communicating with the outside atmosphere to compensate for the pressure difference during the liquid transportation process.

14. The online cleaning device according to claim 2, characterized in that: The controller controls the solution sampling electromagnetic valve, the two-way electromagnetic pump, the water intake electromagnetic valve and the sewage discharge electromagnetic valve. The controller is also used to control the spraying time, the solution injection amount, the cleaning time, the cleaning times, the detection and cleaning processes.

15. The online cleaning device according to claim 2, characterized in that: The lower end pipe of the electromagnetic pump is designed to have a certain tilt angle in the horizontal direction, and the bidirectional electromagnetic pump end is slightly higher. The drainage pipe is designed to have a certain tilt angle in the horizontal direction, and the sewage solenoid valve end is slightly lower.

16. The online cleaning device according to claim 2, characterized in that: The detection chamber and all electromagnetic valves, electromagnetic pumps, pipelines, and connectors must be made of corrosion-resistant materials. It is possible to consider using tetrafluoroethylene-coated electromagnetic valves, electromagnetic pumps, pipelines, and connectors, such as polytetrafluoroethylene coatings and Teflon coatings, which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties. The micro-sprinkler with reflux uses a corrosion-resistant micro-sprinkler, which will not react with chemicals with strong solubility, permeability, and strong oxidizing properties.

17. The online cleaning device according to claim 2, characterized in that: Compared with Scheme 2, the air hole is replaced with the nitrogen pipe access end, and the pressure difference during the liquid entering and flowing out of the detection chamber is balanced by supplementing nitrogen. In this scheme, the detection chamber is a sealed structure isolated from the air. Other technical details are the same as Scheme 2.

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