Device and method for monitoring salt content in water cooling systems of large synchronous condensers

Abstract

This disclosure provides a device and method for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser, comprising: a conductivity transmitter, a water sample storage unit, a standard mother liquor mixing system, and a detection unit. The detection unit includes a water sample storage area and electrodes, which are connected to the conductivity transmitter. The water sample storage unit stores different water samples to be tested and is connected to the detection unit via valves and pipelines. During the detection phase, the water sample storage unit controls the opening and closing of the valves to allow the water samples to be tested to enter the detection unit. The standard mother liquor mixing system is used to mix pure water and standard mother liquor, and prepares the standard solution based on a volumetric configuration mechanism. The standard mother liquor mixing system is connected to the detection unit via a standard solution drive pump and pipelines. During the calibration phase, the standard solution enters the detection unit by controlling the opening and closing of the drive pump.

Description

Technical Field

[0001] This disclosure belongs to the field of water cooling system conductivity detection technology, and particularly relates to a device and method for monitoring the salt content of a medium in a water cooling system for a large synchronous condenser. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] With the rapid development of the ultra-high voltage (UHV) industry, large synchronous condensers have become an effective means of reactive power compensation to ensure the safe and stable operation of DC power transmission units. Therefore, improving the quality of the cooling medium in the water cooling system is essential. Currently, conductivity meters for synchronous condensers are mainly used to monitor the quality of the cooling medium in the water cooling system. Compared with other chemical instruments, they have the advantages of fast response and sensitive signal reaction, providing the fastest diagnostic capability for detecting deterioration in the quality of internal and external cooling water. They also play a significant role in monitoring the operation of the synchronous condenser, reducing corrosion and scaling problems in the water cooling system.

[0004] The inventors discovered that the reliability of online conductivity meters is affected by many factors, including the standard solution, electrode selection, flow medium, temperature, and compensation prevention. Particularly during calibration, current methods primarily rely on two approaches: offline standard solution calibration and online standard solution calibration. Offline standard solution calibration, while technically feasible, cannot currently prepare accurate and environmentally unaffected low-salinity standard solutions for conductivity meters. Furthermore, the high salinity of standard solutions differs significantly from the actual water quality being monitored, and conductivity in pure water is nonlinear. In the field of chemical instruments, offline calibration can only guarantee the stability of the instrument. During the offline calibration process, the environment will inevitably have an impact on the ionic state of the total salt content in the standard solution, which cannot guarantee the accuracy of the instrument. Another method is online calibration, which calibrates online chemical instruments in operation according to the "Inspection Process of Online Chemical Instruments in Power Plants". The medium used is often the water sample being monitored. In fact, it is to compare the standard instrument with the instrument being tested. This type of calibration is not a function inherent to the instrument itself, but rather involves human intervention, which will produce certain errors and bring adverse factors to the improvement of instrument accuracy. Summary of the Invention

[0005] To address the aforementioned problems, this disclosure provides a device and method for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser. The solution described in this disclosure overcomes both offline and online technical challenges, concentrating the advantages of both into the conductivity meter itself. It can automatically calibrate during normal operation, significantly improving its accuracy.

[0006] According to a first aspect of the present disclosure, a device for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser is provided, comprising: a conductivity transmitter, a water sample storage unit, a standard mother liquor mixing system, and a detection unit. The detection unit includes a water sample storage area and an electrode, which is connected to the conductivity transmitter. The detection unit is used for detecting the total salinity of the water sample to be tested and for calibrating the conductivity transmitter.

[0007] The water sample storage unit stores different water samples to be tested and is connected to the detection unit through valves and pipelines. During the detection stage, the water sample storage unit controls the opening and closing of the valves to allow the water samples to enter the detection unit.

[0008] The standard mother liquor mixing system is used to mix pure water and standard mother liquor. It realizes the preparation of standard solution based on the volume configuration mechanism. The standard mother liquor mixing system is connected to the detection unit through a standard solution drive pump and pipeline. During the calibration stage, the standard solution enters the detection unit by controlling the opening and closing of the drive pump.

[0009] Furthermore, the water sample storage unit includes a demineralized water sampling unit, an internal cooling water sampling unit, and an external cooling water sampling unit. The demineralized water sampling unit, the internal cooling water sampling unit, and the external cooling water sampling unit each control the flow of water samples through independent solenoid valves. At the same time, the water samples in the water sample storage unit are injected into the detection unit by a water sample drive pump.

[0010] Furthermore, the water sample drive pump distinguishes the flow of demineralized water, internal cooling water, and external cooling water, and drives the water sample into the detection unit.

[0011] Furthermore, the pure water storage system is used to store the pure water obtained by the water treatment system, and the pure water storage system adopts a floating roof with an external breathing device for sealing, so as to maintain the same atmospheric pressure inside and outside while isolating the outside air.

[0012] Furthermore, the standard solution drive pump is completely shut off during actual production and testing, and is only turned on during calibration.

[0013] Furthermore, the standard mother liquor mixing system is connected to the pure water storage system and the standard mother liquor identification system, respectively. The pure water storage system is connected to the water treatment system for pure water preparation, and the standard mother liquor identification system is connected to the storage reagent bottles of different standard mother liquors.

[0014] Furthermore, the water treatment system and the pure water storage system are connected by a drive pump, which provides power for the flow of pure water.

[0015] Furthermore, the pure water storage system and the standard mother liquor mixing system are connected via a pure water metering pump. The pure water metering pump controls the amount of pure water entering the standard mother liquor mixing system and provides power for the inflow of pure water. The standard mother liquor mixing system and the standard mother liquor identification system are connected via a mother liquor metering pump. The mother liquor metering pump controls the amount of mother liquor entering the standard mother liquor mixing system and provides power for the inflow of mother liquor.

[0016] Furthermore, the standard mother liquor includes demineralized water standard solution, internal cooling water standard solution, and external cooling water standard mother liquor.

[0017] According to a second aspect of the present disclosure, a method for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser is provided, which utilizes the aforementioned device for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser, comprising:

[0018] Detection phase: The conductivity transmitter controls the water sample to be tested to enter the detection unit, and the salinity of the water sample is detected by the electrode based on Ohm's law.

[0019] Calibration phase: By controlling the volume ratio of pure water to standard mother liquor in the standard mother liquor mixing system, a standard solution that meets the preset requirements is obtained. The standard solution in the standard mother liquor mixing system is then controlled to enter the detection unit, and the conductivity transmitter is calibrated based on electrode sensing.

[0020] Compared with the prior art, the beneficial effects of this disclosure are:

[0021] (1) This disclosure provides a method and system for monitoring the salt content of a medium in a water-cooling system for a large synchronous condenser. The scheme adds a water treatment device and an automatic calibration system to the original conductivity meter. Pure water (containing only hydrogen ions and hydroxide ions) is used as the blank for instrument calibration to perform zero-point calibration on the sodium ion device. The device described in this embodiment can quantitatively add the standard solution to the detection system through the automatic control system, and then the standard solution is prepared by quantitatively adding pure water. This process reduces the error of the instrument to the minimum. The method is simple and effective, which greatly improves the accuracy of the chemical instrument, thereby improving the level of technical supervision of the entire synchronous condenser water-cooling system and providing strong technical support for the safe and economical operation of the unit.

[0022] (2) The device described in this disclosure has an automatic calibration function, and the salt content of the calibration solution is close to and controllable with that of the actual operating medium. It can achieve multi-point calibration. The accuracy of the instrument is controlled by the slope of the curve formed after multi-point calibration. The instrument itself can also achieve zero-point calibration. When the zero point deviates, the blank can be automatically deducted, providing a good foundation for the next calibration.

[0023] (3) The solution described in this disclosure fills the gap in the domestic industry in the process of chemical technology maintenance, lays a good foundation for the realization of intelligent digitalization of equipment, improves the overall accuracy of the device, and makes chemical technology supervision simpler, more economical, accurate and intelligent. It also plays a good technical guiding role in the supervision and operation of the entire power industry.

[0024] Advantages of this disclosure in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0025] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0026] Figure 1 This is a schematic diagram of the structure of the water cooling system medium salt content monitoring device for a large synchronous condenser as described in the embodiments of this disclosure;

[0027] The components include: 1. Conductivity transmitter; 2. Water treatment system; 3. Pure water drive pump; 4. Pure water storage system; 5. Standard mother liquor mixing system; 6. Standard mother liquor identification system; 7. Pure water metering pump; 8. Mother liquor metering pump; 9. Standard mother liquor; 10. Standard solution drive pump; 11. Water sample drive pump; 12. Demineralized water solenoid valve; 13. Internal cooling water solenoid valve; 14. External cooling water solenoid valve; 15. Demineralized water sampling unit; 16. Internal cooling water sampling unit; 17. External cooling water sampling unit; 18. Electrode; and 19. Detection unit. Detailed Implementation

[0028] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Where there is no conflict, the embodiments and features described herein can be combined with each other.

[0032] Example 1:

[0033] The purpose of this embodiment is to provide a device for monitoring the salt content of the medium in a water cooling system for a large synchronous condenser.

[0034] like Figure 1 As shown, the salinity monitoring device for the water cooling system of a large synchronous condenser provided in this embodiment mainly monitors the total salinity of the medium in the water cooling system of an ultra-high voltage DC system synchronous condenser. It is an intelligent monitoring device with a detection unit as the reaction center and a transmitter as the control center. The instrument device incorporates technological innovations based on the original online conductivity meter, applying a fully automatic calibration system to the instrument itself. To eliminate errors caused by the environment, the instrument's detection and calibration are performed in a completely enclosed environment, eliminating system interference from the external environment. The introduction of a water treatment system during calibration is a technological innovation in the field of online chemical instrumentation, adding medium zero-point calibration to the instrument calibration and providing blank water samples for the automatic preparation of standard solutions. All components of the device designed in this embodiment are controlled by the transmitter, which acts as the "central brain" of the entire device.

[0035] A device for monitoring the salt content of a medium in a water-cooling system for a large synchronous condenser includes: a conductivity transmitter, a water sample storage unit, a standard mother liquor mixing system, and a detection unit. The detection unit includes a water sample storage area and electrodes, which are connected to the conductivity transmitter. The detection unit is used to detect the total salt content of the water sample to be tested and to calibrate the conductivity transmitter.

[0036] The water sample storage unit stores different water samples to be tested and is connected to the detection unit through valves and pipelines. During the detection stage, the water sample storage unit controls the opening and closing of the valves to allow the water samples to enter the detection unit.

[0037] The standard mother liquor mixing system is used to mix pure water and standard mother liquor. It realizes the preparation of standard solution based on the volume configuration mechanism. The standard mother liquor mixing system is connected to the detection unit through a standard solution drive pump and pipeline. During the calibration stage, the standard solution enters the detection unit by controlling the opening and closing of the drive pump.

[0038] Furthermore, the water sample storage unit includes a demineralized water sampling unit, an internal cooling water sampling unit, and an external cooling water sampling unit. The demineralized water sampling unit, the internal cooling water sampling unit, and the external cooling water sampling unit each control the flow of water samples through independent solenoid valves. At the same time, the water samples in the water sample storage unit are injected into the detection unit by a water sample drive pump.

[0039] Furthermore, the water sample drive pump distinguishes the flow of demineralized water, internal cooling water, and external cooling water, and drives the water sample into the detection unit.

[0040] Furthermore, the pure water storage system is used to store the pure water obtained by the water treatment system, and the pure water storage system adopts a floating roof with an external breathing device for sealing, so as to maintain the same atmospheric pressure inside and outside while isolating the outside air.

[0041] Furthermore, the standard solution drive pump is completely shut off during actual production and testing, and is only turned on during calibration.

[0042] Furthermore, the standard mother liquor mixing system is connected to the pure water storage system and the standard mother liquor identification system, respectively. The pure water storage system is connected to the water treatment system for pure water preparation, and the standard mother liquor identification system is connected to the storage reagent bottles of different standard mother liquors.

[0043] Furthermore, the water treatment system and the pure water storage system are connected by a drive pump, which provides power for the flow of pure water.

[0044] Furthermore, the pure water storage system and the standard mother liquor mixing system are connected via a pure water metering pump. The pure water metering pump controls the amount of pure water entering the standard mother liquor mixing system and provides power for the inflow of pure water. The standard mother liquor mixing system and the standard mother liquor identification system are connected via a mother liquor metering pump. The mother liquor metering pump controls the amount of mother liquor entering the standard mother liquor mixing system and provides power for the inflow of mother liquor.

[0045] Furthermore, the standard mother liquor includes demineralized water standard solution, internal cooling water standard solution, and external cooling water standard mother liquor.

[0046] Specifically, for ease of understanding, the following detailed description of the solution in this embodiment is provided in conjunction with the accompanying drawings:

[0047] This embodiment describes a device for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser, comprising a conductivity transmitter, a water treatment system, a pure water storage system, a standard mother liquor identification system, a standard mother liquor mixing system, a detection unit, a standard solution, electrodes, piping, and a sampling system. The components are described below:

[0048] Conductivity transmitter 1: Fixed in the upper middle part of the device, it plays a guiding, controlling, and display role throughout the entire process and is the only component requiring human intervention. Designers only need to write the program into the transmitter's backend according to the on-site operation and maintenance needs in the early stages; subsequent automation of the instrument requires no further human intervention. It connects to various components such as electrodes, a standard mother liquor mixing system, and solenoid valves. The transmitter has a certain degree of memory, storage, and judgment functions for all data and can generate curves via computer for later fault diagnosis.

[0049] Furthermore, the conductivity transmitter is the data display, output, and control part of the device described in this embodiment, serving as the "central part" of the entire device. During operation, it can determine the microscopic domain of total salinity ions in the water used by the synchronous condenser, and can transmit the data to the display system remotely via the DCS system. The instrument can automatically perform periodic inspection and calibration based on the operating water quality. Maintenance personnel can set the instrument's periodic parameters according to the actual situation. When the signal source triggers the sensitive button, the instrument will automatically start the calibration function. The transmitter automatically identifies the output and execution of the next command through the signal transmitted by the sensor. As an important component in realizing the automatic detection, inspection, and calibration of the instrument, the transmitter plays the role of "commander-in-chief," playing an overall coordinating and controlling role in data protection and stable system operation. It is a prerequisite for ensuring the automated control of the intelligent instrument unit.

[0050] Water treatment system 2: It is the basis for the detection, inspection and calibration of the device described in this embodiment. It can not only provide the detection of background blank water samples, but also provide the standard water sample basis for the preparation of standard samples. The working principle mainly relies on the magnetic effect of the electric field to realize the activity of ions in the water, so that positive ions and negative ions move in opposite directions to the reverse electrode, thereby realizing the desalination and purification of water. The control of the water treatment system unit is completely subject to the instructions of the conductivity transmitter. In actual operation, it mainly plays an important role in "calibration".

[0051] Furthermore, the water treatment system plays a fundamental role in system purification and is a crucial carrier for system operation. The instrument calibration process requires diluting the original mother liquor; if the purity of the raw water used for dilution cannot be guaranteed, the traceability of the standard solution prepared by the system will be affected, further impacting the accuracy of the instrument itself. The water treatment system provides the initial blank for zero-point calibration and also enables automatic cleaning of pipelines during operation and calibration. The water treatment system uses EDI technology to achieve the additive effect of the electric field, causing ions in the water medium to move forward and backward. Hydrogen ions and anions can be retained by the water treatment device and ultimately stored in the storage device.

[0052] Pure water drive pump 3: It is the power unit that controls the water production of the water treatment system and provides the power source for the movement of pure water. The start and stop of this pump mainly serve the water treatment system and the pure water storage system.

[0053] Pure water storage system 4: It plays a pivotal and indispensable role in this device. It mainly stores pure water from water treatment system 2. The system adopts a floating roof with an external breathing device for sealing, which can not only isolate the outside air, but also maintain the same atmospheric pressure inside and outside. The system adopts various anti-corrosion measures and fully considers the corrosion of metal materials by demineralized water.

[0054] Furthermore, the pure water storage system is a storage unit of the pure water system and an important component connecting the water treatment system and the standard mother liquor mixing system. The technical challenge of the storage unit lies in keeping the pure water free from contamination. The system is designed with a conductivity monitoring unit, which can realize real-time measurement of water quality. When the pure water requirements cannot be met, the system will activate sewage discharge and water treatment measures. The system itself is designed with strict floating roof control and equipped with a breathing device, which can achieve isolation from the atmosphere and maintain the pressure between the storage unit and the external environment.

[0055] Standard stock solution mixing system 5: This system mainly completes the preparation process of standard solutions. When it receives a calibration command from the transmitter, the mixing system will select a suitable standard stock solution according to the water sample to be tested. Depending on the calibration point, it will select different points of the standard stock solution for on-site measurement. When the injection of the standard stock solution is completed, the system will complete the injection of pure water by turning on the metering pump 7. The injection of the standard stock solution requires the metering pump 8 to complete, and the injection of pure water requires the metering pump 7 to complete. The cooperation of the metering pumps is also a prerequisite for the accuracy of the standard sample preparation. The standard stock solution mixing system is also equipped with a corresponding standard solution detection unit for the calibration process of the standard solution.

[0056] Furthermore, the standard mother liquor mixing system is a mixing area for pure water and mother liquor. The standard solution preparation mechanism is a volumetric preparation method. When the transmitter starts the calibration function, the mother liquor identification system inputs the standard mother liquor into the mixing system according to the transmitter's command through the metering pump. When the input of the standard mother liquor reaches a certain dose, the metering pump will stop inputting the mother liquor, and at the same time, the pure water metering pump will start. When the standard volume is reached, the system will automatically stop adding water. Finally, the standard mother liquor mixing system will start the automatic mixing mode to achieve the mixing of the standard solution. This method is based on the method of preparing solutions with volumetric flasks to achieve the preparation of standard solutions. An automatic detection instrument is set in the system to realize the volume adjustment process of the standard solution.

[0057] Standard Mother Solution Identification System 6: This system mainly connects the front-end standard solution with the back-end standard mother solution identification system. It mainly extracts the calibration standard mother solution to this device and serves as a temporary storage unit for the standard mother solution.

[0058] Furthermore, the standard mother liquor identification system automatically identifies the standard solution based on the medium sampling. To achieve the same salt content as the monitored water sample, the system automatically identifies and inputs the standard sample, thereby improving the accuracy of the meter itself. The identification system is connected to three different mixed salts, which correspond to the internal cooling water, external cooling water, and demineralized water quality of the camera, respectively. This enables complex logical control. When the input standard mother liquor is unqualified or inconsistent with the original water sample, the system can automatically trigger an alarm.

[0059] The pure water metering pump 7 and the mother liquor metering pump 8 both play a role in the calibration process. To ensure their accuracy, their accuracy should be calibrated periodically.

[0060] Standard stock solution 9: The standard stock solution is mainly a targeted standard solution prepared for the camera condenser system, a demineralized water standard stock solution prepared for demineralized water, an internal cooling water standard stock solution prepared for internal cooling water, and an external cooling water standard stock solution prepared for external cooling water. The standard stock solutions are all placed in sealed reagent bottles, and the injection of the standard solution is controlled by the solenoid valve at the rear end.

[0061] Furthermore, the standard mother liquor is the medium for completing the testing and calibration work. It has a one-to-one correspondence with the detection medium of the camera. The types of salts are generally the same, but different concentrations of standard solutions will be prepared to achieve the linearity of the calibration. The standard solution is the main traceability factor for realizing the fully automatic calibration of the instrument and is the foundation of metrological transfer. This reagent is generally produced by the National Standards Center. In daily operation, it is filled in a standard reagent bottle, and no air can enter inside. During the automatic calibration process, the metering pump at the front end is the power to output the standard solution to the detection unit.

[0062] Standard solution drive pump 10: This metering pump is completely shut off during actual production and testing processes, and is only intermittently turned on during calibration. The transmitter's commands control the start and stop of the drive pump.

[0063] Water sample drive pump 11: This pump is required to drive the water sample to be tested, inject the water sample into the testing unit, and the water sample flow rate must meet the control requirements of the testing unit. This drive pump plays a role in distinguishing and driving the flow of demineralized water, internal cooling water and external cooling water.

[0064] The water sample solenoid valves (including demineralized water solenoid valve 12, internal cooling water solenoid valve 13, and external cooling water solenoid valve 14) mainly realize the flow of water sample. The start and stop of the solenoid valves depend on the instruction of the transmitter and send the start signal to the transmitter. The transmitter converts the signal into the start and stop of the water sample drive pump 11 and transmits the signal to the solenoid valve of the standard mother liquor.

[0065] The water sample storage unit (including demineralized water sampling unit 15, internal cooling water sampling unit 16, and external cooling water sampling unit 17) mainly corresponds to the three different water systems of the camera condenser. Demineralized water sampling unit 15 corresponds to demineralized water, internal cooling water sampling unit 16 corresponds to internal cooling water, and external cooling water sampling unit 17 corresponds to external cooling water. There is a one-to-one correspondence between the water sample storage unit and the solenoid valve.

[0066] Furthermore, the water samples in the water sample storage unit are obtained from the internal cooling water system, external cooling water system, and demineralized water system of the camera condenser system. The sampling device will complete the water sample sampling process according to the instructions of the transmitter. The system water sample collection process will be realized by opening the solenoid valve.

[0067] Electrode 18: The sensor of the device described in this embodiment can realize the conversion of chemical signals to electrical signals. It can convert the conductivity chemical signal from 0 to the range into an electrical signal of 4-20mA, and finally into the display signal of the secondary instrument. The sensor itself measures the resistance of a specified area and converts it into a conductivity signal. During the detection process, the electrode will be completely immersed in the detection medium or standard solution.

[0068] Detection Unit 19: This is the core of the entire device described in this embodiment. It is the main component for detecting and calibrating the total salt content. During the detection process, the water sample enters the detection unit through the inlet, and the meter performs its detection function based on Ohm's law. During the calibration process, the detection unit is also the main site for the standard solution reaction and electrode sensing. The entire process is completed through the detection system. The electrical signals displayed and controlled by the transmitter are obtained through the electrodes in the detection system. The chemical signals in the detection system are the source for completing the detection and calibration. Throughout the process, the reaction is isolated from the external environment, and the reaction medium is not affected by external interference factors such as dust, temperature, and humidity. The detection system is an important standard solution metering device during the calibration process.

[0069] Piping: The piping mainly connects all components, valves, and standard solution sections of the device, serving to transmit standard information throughout the entire system. All piping used in the device is made of sealed PVC material and must be protected from air, especially at the connections between pipes and valves, where airtightness is crucial.

[0070] Example 2:

[0071] The purpose of this embodiment is to provide a method for monitoring the salt content of the medium in a water-cooling system for a large synchronous condenser.

[0072] A method for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser, comprising:

[0073] Detection phase: The conductivity transmitter controls the water sample to be tested to enter the detection unit, and the salinity of the water sample is detected by the electrode based on Ohm's law.

[0074] Calibration phase: By controlling the volume ratio of pure water to standard mother liquor in the standard mother liquor mixing system, a standard solution that meets the preset requirements is obtained. The standard solution in the standard mother liquor mixing system is then controlled to enter the detection unit, and the conductivity transmitter is calibrated based on electrode sensing.

[0075] Specifically, the detailed steps of the method for monitoring the salt content of the medium in the water cooling system of a large synchronous condenser are as follows:

[0076] The device design specifications described in this embodiment can all be displayed via a transmitter, and its basic control program is also written into the transmitter, enabling it to control and issue all commands. The specific process is as follows:

[0077] After the calibration command for the device and system is issued, the system's water treatment process begins, completing the basic preparation and testing of pure water. Under on-site conditions, a water sample with a concentration of 0.060 μS / cm can be generated. The system accumulates and concentrates the water sample in the pure water storage system 4. To ensure that the pure water remains in a closed purifier for a long time, the system adopts intrinsically safe management of the storage unit, completely isolating it from the atmospheric system and the external environment. The device, based on the sampling signal issued by the water sample storage unit (demineralized water sampling unit 15, internal cooling water sampling unit 16, or external cooling water sampling unit 17), completes the command signal of the conductivity transmitter 1, corresponding to the standard mother liquor. In the sampling process of step 9, to ensure system accuracy, the standard mother liquor identification system 6 re-verifies the accuracy of the standard mother liquor. The system uses pure water metering pump 7 and mother liquor metering pump 8 to prepare the standard solution. The entire process is completed in the standard mother liquor mixing system 5. Finally, according to the transmitter's command, the standard solution is input into the detection unit. Electrode 18 transmits the detection signal and calibration information and writes it to the conductivity transmitter 1, thus completing the entire "calibration" process. This disclosure aims to perform the inspection and calibration process based on practical considerations, closely approximating daily operating conditions. The system is accurate with minimal deviation, significantly improving instrument precision and unit safety and stability. The device described in this embodiment can identify different production water samples for ultra-high voltage power transmission synchronous condensers through the sampling system. Detection and calibration are carried out regularly and effectively.

[0078] The above-described embodiment provides a device and method for monitoring the salt content of a medium in a water-cooling system for a large synchronous condenser, which is entirely feasible and has broad application prospects.

[0079] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

[0080] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A device for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser, characterized in that, include: The system includes a conductivity transmitter, a water sample storage unit, a standard mother liquor mixing system, and a detection unit. The detection unit includes a water sample storage area and electrodes, which are connected to the conductivity transmitter. The detection unit is used to detect the total salinity of the water sample and to calibrate the conductivity transmitter. The water sample storage unit stores different water samples to be tested and is connected to the detection unit through valves and pipelines. During the detection stage, the water sample storage unit controls the opening and closing of the valves to allow the water samples to enter the detection unit. The standard mother liquor mixing system is used to mix pure water and standard mother liquor. It realizes the preparation of standard solution based on the volume configuration mechanism. The standard mother liquor mixing system is connected to the detection unit through a standard solution drive pump and pipeline. During the calibration stage, the standard solution enters the detection unit by controlling the opening and closing of the drive pump. An automatic detection instrument is set in the standard mother liquor mixing system to realize the volume adjustment process of the standard solution. The pure water storage system is used to store pure water obtained by the water treatment system, and the pure water storage system adopts a floating roof with an external breathing device for sealing, so as to maintain the same atmospheric pressure inside and outside while isolating the outside air. The standard mother liquor mixing system is connected to the pure water storage system and the standard mother liquor identification system, respectively. The standard mother liquor identification system is connected to the storage reagent bottles of different standard mother liquors. The standard mother liquor is a targeted standard solution prepared for the camera adjustment system.

2. The device for monitoring the salt content of a medium in a water-cooling system for a large synchronous condenser as described in claim 1, characterized in that, The water sample storage unit includes a demineralized water sampling unit, an internal cooling water sampling unit, and an external cooling water sampling unit. The demineralized water sampling unit, the internal cooling water sampling unit, and the external cooling water sampling unit are each controlled by an independent solenoid valve to control the flow of water samples. At the same time, the water samples in the water sample storage unit are injected into the detection unit by a water sample drive pump.

3. The device for monitoring the salt content of a medium in a water-cooling system for a large synchronous condenser as described in claim 2, characterized in that, The water sample drive pump distinguishes the flow of demineralized water, internal cooling water, and external cooling water, and drives the water sample into the detection unit.

4. The salinity monitoring device for a water-cooling system medium in a large synchronous condenser as described in claim 1, characterized in that, The standard solution drive pump is completely shut off during actual production and testing, and is only turned on during calibration.

5. The salinity monitoring device for a water-cooling system medium in a large synchronous condenser as described in claim 1, characterized in that, The pure water storage system is connected to the water treatment system used for pure water preparation.

6. The salinity monitoring device for a water-cooling system medium in a large synchronous condenser as described in claim 5, characterized in that, The water treatment system and the pure water storage system are connected by a drive pump, which provides power for the flow of pure water.

7. The device for monitoring the salt content of a medium in a water-cooling system for a large synchronous condenser as described in claim 5, characterized in that, The pure water storage system and the standard mother liquor mixing system are connected via a pure water metering pump. The pure water metering pump controls the amount of pure water entering the standard mother liquor mixing system and provides power for the inflow of pure water. The standard mother liquor mixing system and the standard mother liquor identification system are connected via a mother liquor metering pump. The mother liquor metering pump controls the amount of mother liquor entering the standard mother liquor mixing system and provides power for the inflow of mother liquor.

8. The salinity monitoring device for a water-cooling system medium in a large synchronous condenser as described in claim 7, characterized in that, The standard mother liquor includes demineralized water standard solution, internal cooling water standard solution, and external cooling water standard mother liquor.

9. A method for monitoring the salinity of a medium in a water-cooling system for a large synchronous condenser, characterized in that, It utilizes a salinity monitoring device for a water-cooling system medium in a large synchronous condenser as described in any one of claims 1-8, comprising: Detection phase: The conductivity transmitter controls the water sample to be tested to enter the detection unit, and the salinity of the water sample is detected by the electrode based on Ohm's law. Calibration phase: By controlling the volume ratio of pure water to standard mother liquor in the standard mother liquor mixing system, a standard solution that meets the preset requirements is obtained. The standard solution in the standard mother liquor mixing system is then controlled to enter the detection unit, and the conductivity transmitter is calibrated based on electrode sensing.

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