Method and device for on-line monitoring of water quality of cooling water system outside converter station valve

Abstract

The invention relates to the technical field of water quality monitoring, in particular to a water quality online monitoring device for a cooling water system outside a converter station valve, a water inlet is formed in the side face of the lowermost layer in an equipment cabinet and used for being communicated with the cooling water system outside the valve, a first monitoring mechanism is arranged on the lowermost layer of the equipment cabinet, and the first monitoring mechanism is communicated with the water inlet. During use, cooling water in a converter station valve external cooling water system is introduced into the first monitoring mechanism for temperature and turbidity monitoring; the cooling water entering the first monitoring mechanism is respectively conveyed to the second monitoring mechanism and the third monitoring mechanism for monitoring the pH value, the conductivity, the dissolved oxygen content, the total hardness, the chloride ion content, the free chlorine content, the ammonia nitrogen content and the chemical oxygen demand; and a monitoring result is transmitted to the upper computer through the lower control machine and the information interaction device for early warning, so that the effect of improving the safety of the converter station valve external cooling water system is achieved.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, specifically to a method and apparatus for online monitoring of water quality in an external cooling water system of a converter station. Background Technology

[0002] A converter station is a site built in a high-voltage direct current (HVDC) transmission system to convert alternating current (AC) to direct current (DC) or vice versa, meeting the power system's requirements for safety, stability, and power quality. Converter stations can be classified into rectifier stations and inverter stations based on their operating modes. The rectifier station converts AC to DC, which is then transmitted to the inverter station via DC transmission lines. The inverter station then converts the DC back to AC, completing the power transmission. Due to the advantages of low losses in DC transmission, converter stations are commonly used for long-distance, high-power power transmission.

[0003] The converter station cooling system is a crucial component ensuring the normal operation of the equipment. Its primary responsibility is heat dissipation and maintaining the equipment within a suitable operating temperature range. Based on their function, converter station cooling systems can be divided into internal valve cooling systems and external valve cooling systems. External valve cooling systems utilize water and air to absorb heat from the internal valve cooling system and transfer it to the outside atmosphere. The main equipment types include air coolers and closed-circuit evaporative cooling towers. For air coolers, factors such as the heat island effect, heat exchange area redundancy, the number and speed regulation of fans, and noise and vibration control must be considered. Closed-circuit evaporative cooling towers, on the other hand, are primarily responsible for dissipating heat into the atmosphere.

[0004] To ensure the normal operation of the converter station's cooling system, regular water quality monitoring and equipment maintenance are necessary. Regular checks of the cooling medium's quality, including water cleanliness, pH value, and hardness, are crucial to ensure proper circulation and heat dissipation. A high pH value can lead to pipe blockage, while a low pH value can cause equipment rust and corrosion. Maintaining a suitable pH range helps reduce scale formation and equipment corrosion. Excessive total hardness leads to scale formation, increased equipment wear, and reduced cooling efficiency; all of these situations can seriously threaten the safety of the converter station.

[0005] Therefore, this application proposes a device for online monitoring of the water quality of the external cooling water system of a converter station, which is used to monitor the external cooling water of the converter station online to improve the safety of the converter station. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a device for online monitoring of water quality in the external cooling water system of a converter station, which is used to solve the safety problems of the converter station mentioned in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for online monitoring of water quality in the external cooling water system of a converter station, comprising an equipment cabinet, the equipment cabinet having a cabinet door for sealing, and the interior of the equipment cabinet being provided with multiple partitions to divide the interior of the equipment cabinet into multiple layers;

[0008] The bottommost side of the equipment cabinet is provided with a water inlet for connecting to the external cooling system. The bottommost layer of the equipment cabinet is provided with a first monitoring mechanism, which is connected to the water inlet.

[0009] The middle layer inside the equipment cabinet is equipped with a second monitoring mechanism and a lower-level controller. The first and second monitoring mechanisms are interconnected. A third monitoring mechanism is provided on the side of the equipment cabinet and is connected to the first monitoring mechanism. The first, second, and third monitoring mechanisms are all connected to the lower-level controller via cables. The second and third monitoring mechanisms are both connected to the external cooling system of the valve through conduits.

[0010] The upper layer inside the equipment cabinet is equipped with a power distribution system and an information interaction device, both of which are connected to the lower-level controller via cables.

[0011] The side of the equipment cabinet is equipped with an electrical control device connected to the power distribution system, and the cabinet door is equipped with a human-machine interaction device, which is signal-connected to the information interaction device.

[0012] Preferably, the first monitoring mechanism includes a first water storage tank, an inlet pipe on the side of the first water storage tank and connected to an inlet, a first outlet pipe on the side of the first water storage tank and connected to a third monitoring mechanism, and a second outlet pipe on the top of the first water storage tank and connected to a second monitoring mechanism.

[0013] The first water storage tank is equipped with a temperature and turbidity monitoring unit inside. The end of the temperature and turbidity monitoring unit is equipped with an anti-reverse component. An electrical connector is provided on the side of the first water storage tank. The temperature and turbidity monitoring unit is connected to the electrical connector by cable, and the electrical connector is connected to the lower control unit by cable.

[0014] Preferably, the water inlet has multiple independent channels, the number of water inlet pipes is equal to the number of channels in the water inlet, and the water inlet pipes correspond one-to-one with the channels in the water inlet;

[0015] The number of temperature and turbidity monitoring units is matched with the number of water inlet pipes, and the two are connected in a one-to-one correspondence.

[0016] Preferably, the temperature and turbidity monitoring unit includes a flow guide box, the interior of which is provided with a cavity that is connected to the water inlet pipe;

[0017] The flow guide box has a waterproof sealing box inside, and a temperature monitor and a turbidity monitor are respectively installed on the waterproof sealing box. The temperature monitor and the turbidity monitor are both connected to the lower control unit through the waterproof sealing box.

[0018] Preferably, the anti-reverse component includes a drain pipe that communicates with the interior of the flow guide box. The interior of the drain pipe is provided with a horizontally sliding sealing ball. The interior of the drain pipe at the end away from the flow guide box is provided with a supporting seepage pipe. The outer surface of the supporting seepage pipe is provided with a plurality of flow guide grooves at equal intervals. The outer surface of the supporting seepage pipe is provided with an anti-reverse spring. One end of the anti-reverse spring abuts against the outer surface of the sealing ball, and the other end of the anti-reverse spring abuts against the inner wall of the drain pipe.

[0019] Preferably, the surface of the waterproof sealing box is provided with a light-transmitting plate cleaning section, which spans above the turbidity monitor and abuts against the outer surface of the turbidity monitor.

[0020] Preferably, the light-transmitting plate cleaning part includes two support drive rods disposed on both sides of the turbidity monitor. The two support drive rods jointly support a scraper. The scraper can move horizontally along the axial direction of the support drive rods, and the bottom of the scraper abuts against the outer surface of the turbidity monitor.

[0021] Preferably, the second monitoring mechanism includes a second water storage tank, with multiple water inlet pipes on the side of the second water storage tank, a water pump on the top of the second water storage tank extending into the interior of the second water storage tank, and several water quality monitoring probes on the top of the second water storage tank, all of which extend into the interior of the second water storage tank.

[0022] The water pump and water quality monitoring probe are both connected to the lower-level controller via cables.

[0023] Preferably, the water inlet pipe includes a connecting pipe that communicates with the second water storage tank. The connection between the connecting pipe and the second water storage tank is provided with a filter hole. One end of the connecting pipe located inside the second water storage tank is provided with a support and limiting frame. The end of the support and limiting frame is provided with a limiting baffle. A horizontally movable unblocking component is provided between the support and limiting frames. A return spring is provided between the unblocking component and the limiting baffle.

[0024] The unblocking component includes a drive plate, one end of which facing the filter hole is provided with a cleaning needle adapted to the filter hole, and the side of the drive plate is provided with a guide groove adapted to the support limit frame.

[0025] A method for online monitoring of water quality in an external cooling water system of a converter station, the method comprising the implementation of an online monitoring device for the water quality of the external cooling water system of the converter station and the following steps:

[0026] S1. Multiple pipes extend from the inlet, and the multiple pipes are connected to multiple parts of the external cooling water system of the converter station valve, and the cooling water is introduced into the first water storage tank through the inlet pipe and the inlet.

[0027] S2. Before entering the first water storage tank, the cooling water first enters the interior of the guide box and fills the interior of the guide box. At this time, the temperature monitor monitors the water temperature, the turbidity monitor monitors the turbidity of the cooling water, and transmits the monitoring data to the lower control unit.

[0028] S3. After the cooling water passes through the temperature and turbidity monitoring unit and the anti-reverse component and fills the first water storage tank, part of the cooling water enters the third monitoring unit through the temperature and turbidity monitoring unit to monitor the ammonia nitrogen content and chemical oxygen demand. Part of the cooling water is pumped into the second water storage tank through the water pump. The pH value, conductivity, dissolved oxygen content, total hardness, chloride ion content and free chlorine content are monitored by the water quality monitoring probe, and the monitoring data is transmitted to the lower control unit.

[0029] S4. After receiving the data information, the lower-level controller transmits it to the information interaction device and then to the external upper-level computer through the information interaction device. At the same time, the second and third monitoring mechanisms circulate their internal cooling water to the external converter station valve cooling water system for circulation.

[0030] S5. Repeat the above instructions to monitor the cooling water quality in the external cooling water system of the converter station.

[0031] S6. During the monitoring of cooling water quality, operators can set the information transmission interval and monitoring and early warning threshold in real time online through an external host computer, human-machine interaction device and electronic control device.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention improves the safety of the converter station's external cooling water system by introducing cooling water from the converter station's external cooling water system into a first monitoring unit for temperature and turbidity monitoring. The cooling water entering the first monitoring unit is then transported to a second and a third monitoring unit for pH, conductivity, dissolved oxygen content, total hardness, chloride ion content, free chlorine content, ammonia nitrogen content, and chemical oxygen demand monitoring. The monitoring results are transmitted to a host computer via a lower-level controller and an information interaction device for early warning, thereby enhancing the safety of the converter station's external cooling water system.

[0034] This invention sets up multiple independent channels in the water inlet and sets up water inlet pipes adapted to the independent channels on the side of the first water storage tank. At the same time, a temperature and turbidity monitoring unit is set at the end of each water inlet pipe. Thus, during the monitoring process, the temperature abnormality point and water turbidity abnormality point of the external cooling water system of the converter station valve can be identified in real time, which can be used to quickly locate the abnormality and improve maintenance efficiency.

[0035] This invention improves the accuracy of cooling water turbidity monitoring by providing a support drive rod on a waterproof sealed box to support and drive the horizontal movement of a scraper. The horizontal movement of the scraper wipes the outer surface of the turbidity monitor, thereby reducing the adhesion of impurities in the water to the surface of the optical components of the turbidity monitor and reducing monitoring errors.

[0036] This invention improves monitoring accuracy by installing a drain pipe at the end of the temperature and turbidity monitoring unit, and installing a sealing ball and a supporting seepage pipe inside the drain pipe, and using a check spring to control the position of the sealing ball. During monitoring, the sealing ball can move to prevent the condensate mixed in the first water storage tank from flowing back into the guide box and contaminating the newly sampled sample, thus achieving the effect of further improving monitoring accuracy.

[0037] This invention filters the cooling water by setting a filter hole at the connection between the connecting pipe and the second water storage tank, so as to prevent larger impurities from entering the second water storage tank and adhering to the surface of the water quality monitoring probe, thus causing inaccurate monitoring data.

[0038] Meanwhile, a support and limit frame and a limit baffle are set at the end of the filter hole to support and limit the drive plate. During the water pumping process, the water pressure will compress the reset spring to make the cleaning needle disengage from the filter hole to achieve flow. When the water pumping is finished, the drive plate is driven by the elastic pressure of the reset spring to make the cleaning needle insert into the filter hole to clear the impurities in the filter hole and achieve the effect of avoiding blockage. Attached Figure Description

[0039] Figure 1 This is a front view of the structure of the present invention.

[0040] Figure 2 This is a perspective view of the structure of the present invention.

[0041] Figure 3 This is a cross-sectional view of the structure of the first monitoring mechanism of the present invention.

[0042] Figure 4 This is a cross-sectional view of the temperature and turbidity monitoring unit of the present invention.

[0043] Figure 5 This is a perspective view of the cross-sectional view of the temperature and turbidity monitoring unit of the present invention.

[0044] Figure 6For the present invention Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0045] Figure 7 This is a schematic diagram of the structure of the second monitoring mechanism of the present invention.

[0046] Figure 8 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B.

[0047] Figure 9 This is a cross-sectional view of the structure at the connection between the water inlet pipe and the second water storage tank of the present invention.

[0048] Figure 10 This is a schematic diagram of the connection between the water inlet pipe and the second water storage tank of the present invention.

[0049] Figure 11 This is a schematic diagram of the unblocking component of the present invention.

[0050] Component designation explanation:

[0051] 1. Equipment cabinet; 2. Isolation plate; 3. Water inlet;

[0052] 4. First monitoring unit; 41. First water storage tank; 42. Inlet pipe; 43. First outlet pipe; 44. Second outlet pipe; 45. Electrical connector;

[0053] 46. ​​Temperature and turbidity monitoring unit; 461. Flow guide box; 462. Waterproof sealing box; 463. Temperature monitor; 464. Turbidity monitor; 465. Light-transmitting plate cleaning unit; 4651. Support drive rod; 4652. Scraper;

[0054] 47. Anti-reverse component; 471. Drain pipe; 472. Sealing ball; 473. Support for seepage pipe; 474. Guide channel; 475. Anti-reverse spring;

[0055] 5. Second monitoring unit; 51. Second water storage tank; 52. Water inlet pipe; 521. Connecting pipe; 522. Filter hole; 523. Support and limit frame; 524. Limiting baffle; 525. Unblocking component; 5251. Drive plate; 5252. Cleaning needle; 5253. Guide groove; 526. Return spring; 53. Water pump; 54. Water quality monitoring probe;

[0056] 6. Third monitoring agency; 7. Lower-level controller; 8. Power distribution system; 9. Information interaction device; 10. Human-machine interaction device; 11. Electrical control device. Detailed Implementation

[0057] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0058] Please see Figures 1 to 11 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0059] like Figure 1 and Figure 2 As shown, the present invention provides a device for online monitoring of water quality in the external cooling water system of a converter station, including an equipment cabinet 1. The equipment cabinet 1 has a cabinet door for sealing. The interior of the equipment cabinet 1 is provided with multiple isolation plates 2 to divide the interior of the equipment cabinet 1 into multiple layers to improve the internal space of the equipment cabinet 1 and enhance the ease of installation of the equipment.

[0060] The bottom side of the equipment cabinet 1 is provided with a water inlet 3 for connecting with the external cooling system of the valve. The bottom layer of the equipment cabinet 1 is provided with a first monitoring mechanism 4, which is connected to the water inlet 3, so that the cooling water in the external cooling system of the converter station can enter the interior of the first monitoring mechanism 4 to monitor the water temperature and turbidity first.

[0061] The middle layer inside equipment cabinet 1 houses a second monitoring unit 5 and a lower-level control unit 7. The first monitoring unit 4 and the second monitoring unit 5 are interconnected. A third monitoring unit 6 is located on the side of equipment cabinet 1 and is connected to the first monitoring unit 4. The third monitoring unit 6 has a box-like structure and contains equipment for monitoring ammonia nitrogen and chemical oxygen demand (COD). The ammonia nitrogen monitoring equipment uses a photometric method, while the COD monitoring equipment uses either the potassium dichromate method or the permanganate index method. Cooling water, after temperature and turbidity monitoring, enters the second monitoring unit 5 and the third monitoring unit 6. The second monitoring unit 5 monitors the pH, conductivity, dissolved oxygen content, total hardness, chloride ion content, and free chlorine content of the cooling water, while the third monitoring unit 6 monitors the ammonia content of the cooling water. Nitrogen content and chemical oxygen demand (COD) are monitored. The first monitoring unit 4, the second monitoring unit 5, and the third monitoring unit 6 are all connected to the lower-level controller 7 via cables. The monitoring results of the first monitoring unit 4, the second monitoring unit 5, and the third monitoring unit 6 are transmitted to the lower-level controller 7 via cables. The second monitoring unit 5 and the third monitoring unit 6 are connected to the external cooling system of the converter station via conduits. The monitored cooling water is returned to the external cooling system of the converter station via conduits to continue circulating, thus avoiding water shortage in the external cooling system of the converter station. The cooling water in the third monitoring unit 6 needs to be purified after the test is completed before it can enter the external cooling system of the converter station for circulation. Otherwise, the cooling water in the third monitoring unit 6 will be discharged. Since the monitoring interval of ammonia nitrogen content and COD does not need to be monitored in real time, the amount of cooling water loss is not large.

[0062] The upper layer inside the equipment cabinet 1 is equipped with a power distribution system 8 and an information interaction device 9. Both the power distribution system 8 and the information interaction device 9 are connected to the lower-level controller 7 via cables. The power distribution system 8 includes, but is not limited to, grounding protection devices, leakage protection devices, and terminal blocks, which are used to control current, transmit electrical energy, and protect electrical safety, and are used to supply power to all electrical equipment. The information interaction device 9 includes wired and wireless devices that can receive and transmit signals and instructions, and is used to communicate with an external host computer to facilitate signal transmission and allow the external host computer to control and set parameters for this equipment.

[0063] The side of the equipment cabinet 1 is equipped with an electrical control device 11 connected to the power distribution system 8, which is used to monitor the current and voltage of the power distribution system 8 and control the power distribution system 8. The cabinet door of the equipment cabinet 1 is equipped with a human-machine interaction device 10, which is connected to the information interaction device 9 for convenient setting of monitoring parameters next to the equipment.

[0064] pH monitoring range: generally should be between 6.5 and 9.0, depending on the converter station equipment and process requirements. Too high or too low pH values ​​will accelerate the corrosion or scaling process of the equipment. Measurement range: 0 to 14.00 pH. Compensation and calibration temperature compensation range: 0 to 99.9℃ (based on 25℃). Calibration is performed by automatically and manually inputting the zero point, slope, and known pH value.

[0065] Electrical conductivity: Reflects the total amount of dissolved salts in water and is an important indicator for judging the purity and pollution level of water. It is determined according to the actual situation of the converter station and should generally be controlled within a certain range to avoid scaling and corrosion. Measurement range: 0.01~30μS / cm, temperature compensation range is automatically or manually set to 0~99.9℃ (based on 25℃), accuracy: ±0.5%FS, ±0.3℃, repeatability error: ±0.2%FS;

[0066] Turbidity: Turbidity reduces the heat dissipation efficiency of the cooling system, leading to overheating of equipment and potential clogging of equipment, affecting system operation. It should be kept below a certain threshold, which is determined based on the requirements of the converter station; Measurement range: 0-100 NTU, Measurement accuracy: ±2%FS (full scale), Repeatability: ±0.2%FS, Response time: 300 seconds (90% range variation), calibrated manually and automatically;

[0067] Temperature: Temperature is an important factor affecting the physical and chemical properties of water as well as the activity of microorganisms, and is determined according to the process requirements of the converter station; Measurement range: 0℃ to 100℃, ±0.1℃ (within the range of 0℃ to 50℃);

[0068] Dissolved oxygen: Both excessively high and low dissolved oxygen levels can have adverse effects on the system. They should generally be controlled within a certain range to avoid corrosion and microbial growth. Measurement range: 0-20 mg / L, dissolved oxygen saturation: 0-300%, with automatic compensation within the range of 0-45°C.

[0069] Total hardness: Reflects the total amount of calcium and magnesium ions in water, and is closely related to scaling and corrosion. It is determined based on the actual conditions of the converter station and water quality requirements. Water quality requirements during hardness measurement: pH: 4–10; Iron: <3ppm; Copper: <0.2ppm; Aluminum: <0.1ppm; Manganese: <0.2ppm; Acid capacity: KS4.3 <5mmol / L;

[0070] Chloride ions: Chloride ions are highly corrosive, especially when in contact with metallic materials, they will accelerate the corrosion process of equipment. The concentration should be kept below the corrosion limit that the equipment material can withstand; Measurement range: 0-50 / 0-10000 mg / L, accuracy: ±5% or ±0.05 mg / L;

[0071] Free chlorine: Excessive free chlorine concentration will exacerbate the consumption of water treatment agents and affect the long-term operation of equipment. The concentration should be determined according to the disinfection and corrosion prevention requirements of the converter station. Measurement range: 0-10 mg / L, resolution: 0.01 mg / L, minimum monitoring limit: 0.01 mg / L.

[0072] NH3-N (ammonia nitrogen): Reflects the content of ammonia nitrogen in water and is one of the important indicators for assessing the degree of water pollution. It is determined according to the environmental protection requirements and water quality standards of the converter station.

[0073] COD (Chemical Oxygen Demand): Reflects the content of organic pollutants in water and is one of the important indicators for assessing the degree of water pollution. It should be below a certain threshold to avoid damage to the system caused by organic pollution.

[0074] Monitoring frequency:

[0075] For key parameters such as pH, conductivity, and turbidity, real-time monitoring is recommended.

[0076] For other parameters, the frequency of regular monitoring can be set according to the actual situation, such as daily, weekly, or monthly.

[0077] Alarm settings:

[0078] When water quality parameters exceed the set range, the system automatically issues an alarm and records abnormal data.

[0079] Alarm thresholds should be set according to the actual conditions of the converter station and water quality requirements to ensure timely detection and handling of water quality problems.

[0080] like Figure 3 As shown, in some embodiments, the first monitoring mechanism 4 of the present invention includes a first water storage tank 41, which is a sealed container with an internal cavity and an openable and closable sealing cover for convenient installation and maintenance of its internal equipment; a water inlet pipe 42 is provided on the side of the first water storage tank 41, which is connected to the water inlet 3, so that the cooling water in the external cooling water system of the converter station valve can enter the first water storage tank 41 for monitoring; a first water outlet pipe 43 is provided on the side of the first water storage tank 41 and is connected to the third monitoring mechanism 6 for diversion, so that some of the cooling water can enter the third monitoring mechanism 6 for monitoring; a second water outlet pipe 44 is provided on the top of the first water storage tank 41 and is connected to the second monitoring mechanism 5, and the remaining part of the cooling water enters the second monitoring mechanism 5 for monitoring;

[0081] The first water storage tank 41 is equipped with a temperature and turbidity monitoring unit 46. Cooling water from the inlet pipe 42 first enters the temperature and turbidity monitoring unit 46 for temperature and turbidity monitoring to avoid temperature loss and uneven turbidity caused by excessive cooling water transmission distance. The end of the temperature and turbidity monitoring unit 46 is equipped with an anti-reverse component 47 to prevent the cooling water discharged from the temperature and turbidity monitoring unit 46 from flowing back into the temperature and turbidity monitoring unit 46 and affecting the accuracy of subsequent monitoring. The side of the first water storage tank 41 is equipped with an electrical connector 45. The temperature and turbidity monitoring unit 46 is connected to the electrical connector 45 by cable, and the electrical connector 45 is also connected to the lower-level controller 7 by cable. This is used to transmit the temperature and turbidity information of the cooling water to the lower-level controller 7 and to supply power to the temperature and turbidity monitoring unit 46 through the cable.

[0082] like Figure 2 and Figure 3 As shown, in some embodiments, the inlet 3 of the present invention is provided with multiple independent channels, the number of inlet pipes 42 is equal to the number of channels in the inlet 3, and the inlet pipes 42 correspond one-to-one with the channels in the inlet 3; the number of temperature and turbidity monitoring units 46 is adapted to the number of inlet pipes 42, and the two are connected one-to-one.

[0083] Multiple independent channels are connected to various parts of the converter station's external cooling water system (circulation pipeline, condensate pipeline, water storage equipment, etc.) through conduits, enabling multi-point monitoring to promptly detect abnormal temperatures and turbidity, thus improving the convenience of maintaining the converter station's external cooling water system.

[0084] like Figure 4 and Figure 5 As shown, in some embodiments, the temperature and turbidity monitoring unit 46 of the present invention includes a flow guide box 461. The flow guide box 461 has an internal cavity that communicates with the water inlet pipe 42, allowing the acquired cooling water sample to pass through. The flow guide box 461 also has a waterproof sealing box 462, on which a temperature monitor 463 and a turbidity monitor 464 are respectively mounted. Both the temperature monitor 463 and the turbidity monitor 464 are connected to the lower-level controller 7 through the waterproof sealing box 462. When the cooling water is inside the flow guide box 461, the temperature monitor 463 is in direct contact with the cooling water and converts the water temperature into an electronic signal using an NTC temperature sensor for temperature measurement. The turbidity monitor 464 is based on optical methods, such as transmitted light method and scattered light method, which irradiate light into the cooling water and monitor the turbidity of the cooling water by measuring the light transmittance or the intensity of the scattered light.

[0085] like Figures 4-6As shown, in some embodiments, the anti-reverse component 47 of the present invention includes a drain pipe 471, which is connected to the interior of the guide box 461. The interior of the drain pipe 471 is provided with a horizontally sliding sealing ball 472. The interior of the drain pipe 471 at the end away from the guide box 461 is provided with a supporting seepage pipe 473. The outer surface of the supporting seepage pipe 473 is provided with a plurality of guide grooves 474 at equal intervals. The outer surface of the supporting seepage pipe 473 is provided with an anti-reverse spring 475. One end of the anti-reverse spring 475 abuts against the outer surface of the sealing ball 472, and the other end of the anti-reverse spring 475 abuts against the inner wall of the drain pipe 471.

[0086] When cooling water continuously enters the guide box 461 through the inlet pipe 42, the water pressure pushes the sealing ball 472 closer to the supporting seepage pipe 473. The water flow enters the first water storage tank 41 through the guide groove 474, and is diverted to the second monitoring mechanism 5 and the third monitoring mechanism 6 through the first outlet pipe 43 and the second outlet pipe 44. When the inlet pipe 42 stops flowing with water, the sealing ball 472 moves back under the elastic action of the anti-reverse spring 475 and comes into contact with the opening of the guide box 461 to achieve a seal, so as to prevent the cooling water mixed in the first water storage tank 41 from flowing back into the guide box 461 and contaminating the sample, thereby improving the accuracy of temperature monitoring and turbidity monitoring.

[0087] like Figure 4 and Figure 5 As shown, in some embodiments, the surface of the waterproof sealing box 462 of the present invention is provided with a light-transmitting plate cleaning part 465. The light-transmitting plate cleaning part 465 spans above the turbidity monitor 464 and abuts against the outer surface of the turbidity monitor 464. When the light-transmitting plate of the turbidity monitor 464 is immersed in cooling water for a long time, impurities in the cooling water will adhere to the surface of the light-transmitting plate, thereby affecting the light transmittance and causing inaccurate monitoring results of the turbidity monitor 464. At this time, the light-transmitting plate can be cleaned by the horizontal movement of the light-transmitting plate cleaning part 465 to reduce the interference of contaminants on the monitoring light.

[0088] like Figure 4 and Figure 5 As shown, in some embodiments, the light-transmitting plate cleaning part 465 of the present invention includes two support drive rods 4651 disposed on both sides of the turbidity monitor 464. The two support drive rods 4651 jointly support a scraper 4652. The scraper 4652 can move horizontally along the axial direction of the support drive rods 4651. The bottom of the scraper 4652 abuts against the outer surface of the turbidity monitor 464.

[0089] The principle of the support drive rod 4651 driving the scraper 4652 is the same as that of the magnetic levitation guide rail. The circuit board in the waterproof sealing box 462 supplies power to the support drive rod 4651, thereby generating a controlled electromagnetic force to drive the scraper 4652 to slide controllably along the axis of the support drive rod 4651. The kinetic energy generated by the sliding is used to scrape off the adhering substances on the surface of the turbidity monitor 464.

[0090] like Figure 7 As shown, in some embodiments, the second monitoring mechanism 5 of the present invention includes a second water storage tank 51, which is a sealed container; multiple water inlet pipes 52 are provided on the side of the second water storage tank 51 for introducing water into the second water storage tank 51 or discharging water from the second water storage tank 51, and the idle water inlet pipes 52 are sealed with plugs; a water pump 53 is provided on the top of the second water storage tank 51, which extends into the interior of the second water storage tank 51. The water pump 53 is a pump, which generates suction when working to draw cooling water from the first monitoring mechanism 4 into the interior of the second water storage tank 51; a number of water quality monitoring probes 54 are also provided on the top of the second water storage tank 51, and all water quality monitoring probes 54 extend into the interior of the second water storage tank 51. The water pump 53 and the water quality monitoring probes 54 are respectively connected to the lower control unit 7 via cables; The water quality monitoring probes 54 are data acquisition probes used to monitor HP value, conductivity, dissolved oxygen content, total hardness, chloride ion content, and free chlorine content. They are used to monitor various parameters of the cooling water in the second water storage tank 51. The monitored data is transmitted via cable to the corresponding monitoring equipment in the lower-level controller 7. The data generated by the monitoring equipment is integrated by the processor inside the lower-level controller 7 and then transmitted to the information interaction device 9. At the same time, the external upper-level computer can transmit signals to the lower-level controller 7 through the information interaction device 9. The signals are transmitted by the processor in the lower-level controller 7 to the water pump 53 and the water quality monitoring probes 54, respectively. The pumping parameters of the water pump 53 and the preset monitoring data of the water quality monitoring probes 54 can be set. When any of the cooling water data exceeds the preset value, an alarm mechanism is triggered.

[0091] Chloride ions and free chlorine were determined using an electrode method, while total hardness was monitored using a spectrophotometric titration method.

[0092] like Figures 8-11As shown, in some embodiments, the water inlet pipe 52 of the present invention includes a connecting pipe 521 communicating with the second water storage tank 51. The connecting pipe 521 is used to facilitate the connection of external conduits. A filter hole 522 is provided at the connection between the connecting pipe 521 and the second water storage tank 51 for filtering larger impurities. A support limiting frame 523 is provided at one end of the connecting pipe 521 inside the second water storage tank 51. The support limiting frame 523 is composed of multiple uprights set on the edge of the connecting pipe 521. A limiting baffle 524 is provided at the end of the support limiting frame 523. A horizontally movable unblocking component 525 is provided between the support limiting frames 523. A return spring 526 is provided between the unblocking component 525 and the limiting baffle 524.

[0093] The unblocking component 525 includes a drive plate 5251. One end of the drive plate 5251 facing the filter hole 522 is provided with a cleaning needle 5252 adapted to the filter hole 522. The side of the drive plate 5251 is provided with a guide groove 5253 adapted to the support limit frame 523.

[0094] During operation, when the water pump 53 is working, a pressure difference is generated inside and outside the second water storage tank 51. This pressure difference causes the cooling water inside the connecting pipe 521 to push the drive plate 5251 towards the limiting baffle 524, compressing the reset spring 526 and allowing the filter hole 522 to connect with the interior of the second water storage tank 51 for water intake. When the water pump 53 stops working and the pressure inside and outside the second water storage tank 51 is balanced, the reset spring 526 will drive the drive plate 5251 towards the filter hole 522 under elastic pressure, and insert the cleaning needle 5252 into the filter hole 522 to achieve a seal. While sealing the filter hole 522, the cleaning needle 5252 will push out impurities in the filter hole 522 to prevent the filter hole 522 from becoming blocked. During the movement of the drive plate 5251, the guide groove 5253 set on the edge of the drive plate 5251 cooperates with the support limiting frame 523 to completely limit the angle of the drive plate 5251, so that the cleaning needle 5252 can be accurately inserted into the filter hole 522.

[0095] A method for online monitoring of water quality in an external cooling water system of a converter station, comprising the implementation of an online monitoring device for the water quality of the external cooling water system of the converter station and the following steps:

[0096] S1. Multiple pipes extend from the inlet 3 and are connected to multiple parts of the external cooling water system of the converter station valve. The cooling water is introduced into the first water storage tank 41 through the inlet pipe 42 and the inlet 3.

[0097] S2. Before entering the first water storage tank 41, the cooling water first enters the interior of the guide box 461 and fills the interior of the guide box 461. At this time, the temperature monitor 463 monitors the water temperature, the turbidity monitor 464 monitors the turbidity of the cooling water, and transmits the monitoring data to the lower control unit 7.

[0098] S3. After the cooling water passes through the temperature and turbidity monitoring unit 46 and the anti-reverse component 47 and fills the first water storage tank 41, part of the cooling water enters the third monitoring unit 6 through the temperature and turbidity monitoring unit 46 to monitor the ammonia nitrogen content and chemical oxygen demand. Part of the cooling water is pumped into the second water storage tank 51 through the water pump 53. The pH value, conductivity, dissolved oxygen content, total hardness, chloride ion content and free chlorine content are monitored by the water quality monitoring probe 54, and the monitoring data is transmitted to the lower control unit 7.

[0099] S4. After receiving the data information, the lower-level controller 7 transmits it to the information interaction device 9 and then to the external upper-level computer. At the same time, the second monitoring device 5 and the third monitoring device 6 circulate their internal cooling water to the external converter station valve cooling water system for circulation.

[0100] S5. Repeat the above instructions to monitor the cooling water quality in the external cooling water system of the converter station.

[0101] S6. During the monitoring of cooling water quality, operators can set the information transmission interval and monitoring and early warning threshold in real time online through an external host computer, human-machine interaction device 10 and electronic control device 11.

[0102] In summary, the device for online monitoring of water quality in the external cooling water system of the converter station valve of the present invention introduces the cooling water in the external cooling water system of the converter station valve into the first monitoring unit 4 for temperature and turbidity monitoring, and then transports the cooling water entering the first monitoring unit 4 to the second monitoring unit 5 and the third monitoring unit 6 respectively for pH value, conductivity, dissolved oxygen content, total hardness, chloride ion content, free chlorine content, ammonia nitrogen content and chemical oxygen demand monitoring. The monitoring results are transmitted to the upper computer for early warning through the lower control unit 7 and the information interaction device 9, thereby improving the safety of the external cooling water system of the converter station valve.

[0103] This invention sets up multiple independent channels in the water inlet 3 and sets up water inlet pipes 42 adapted to the independent channels on the side of the first water storage tank 41. At the same time, a temperature and turbidity monitoring unit 46 is set at the end of each water inlet pipe 42. Thus, during the monitoring process, the temperature abnormality point and water turbidity abnormality point of the external cooling water system of the converter station valve can be identified in real time, which can be used to quickly locate the abnormality and improve maintenance efficiency.

[0104] This invention provides a support drive rod 4651 on a waterproof sealing box 462 to support and drive the horizontal movement of a scraper 4652. The horizontal movement of the scraper 4652 is used to wipe the outer surface of the turbidity monitor 464, thereby reducing the adhesion of impurities in the water to the surface of the optical elements of the turbidity monitor 464 and causing monitoring errors. This achieves the effect of improving the accuracy of cooling water turbidity monitoring.

[0105] This invention improves monitoring accuracy by installing a drain pipe 471 at the end of the temperature and turbidity monitoring unit 46, and installing a sealing ball 472 and a supporting seepage pipe 473 inside the drain pipe 471, and using a check spring 475 to control the position of the sealing ball 472. During monitoring, the sealing ball 472 can be moved to prevent the mixed condensate in the first water storage tank 41 from flowing back into the guide box 461 and contaminating the newly sampled sample.

[0106] The present invention uses a filter hole 522 at the connection between the connecting pipe 521 and the second water storage tank 51 to filter the cooling water, so as to prevent larger impurities from entering the second water storage tank 51 and adhering to the surface of the water quality monitoring probe 54, thus causing inaccurate monitoring data.

[0107] Meanwhile, a support and limiting frame 523 and a limiting baffle 524 are provided at the end of the filter hole 522 to support and limit the drive plate 5251. During the water pumping process, the water pressure will compress the return spring 526 to make the cleaning needle 5252 disengage from the filter hole 522 to achieve flow. When the water pumping is finished, the drive plate 5251 is driven by the elastic pressure of the return spring 526 to make the cleaning needle 5252 insert into the filter hole 522 to clear the impurities in the filter hole 522, thereby achieving the effect of avoiding blockage.

[0108] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention. Furthermore, it should be noted that the components of the present invention are not limited to the overall application described above. Each technical feature described in the specification can be used individually or in combination as needed. Therefore, the present invention naturally covers other combinations and specific applications related to the inventive points of this case.

Claims

1. A device for on-line monitoring of water quality of a valve-external cooling water system of a converter station, characterized in that, The device cabinet (1) is provided with a plurality of isolation plates (2) in the interior of the device cabinet (1), and the interior of the device cabinet (1) is divided into a plurality of layers by the plurality of isolation plates (2); The side surface of the lowermost layer in the interior of the device cabinet (1) is provided with a water inlet (3) for communicating with an external valve cooling system, and the lowermost layer of the device cabinet (1) is provided with a first monitoring mechanism (4) which communicates with the water inlet (3); The middle layer in the interior of the device cabinet (1) is respectively provided with a second monitoring mechanism (5) and a lower-level control machine (7), the first monitoring mechanism (4) and the second monitoring mechanism (5) communicate with each other, the side surface of the device cabinet (1) is provided with a third monitoring mechanism (6) which communicates with the first monitoring mechanism (4), the first monitoring mechanism (4), the second monitoring mechanism (5) and the third monitoring mechanism (6) are all connected with the lower-level control machine (7) by cables, and the second monitoring mechanism (5) and the third monitoring mechanism (6) both communicate with the external valve cooling system through a pipeline. The upper layer in the interior of the device cabinet (1) is provided with a power distribution system (8) and an information interaction device (9), and the power distribution system (8) and the information interaction device (9) are both connected with the lower-level control machine (7) by cables. The side surface of the device cabinet (1) is provided with an electric control device (11) which is connected with the power distribution system (8), and the cabinet door of the device cabinet (1) is provided with a man-machine interaction device (10) which is signal connected with the information interaction device (9).

2. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 1, characterized in that: The first monitoring mechanism (4) comprises a first water storage bin (41), the side surface of the first water storage bin (41) is provided with a water inlet pipe (42) which communicates with the water inlet (3), the side surface of the first water storage bin (41) is provided with a first water outlet pipe (43) which communicates with the third monitoring mechanism (6), and the top of the first water storage bin (41) is provided with a second water outlet pipe (44) which communicates with the second monitoring mechanism (5). The interior of the first water storage bin (41) is provided with a temperature and turbidity monitoring part (46), the end of the temperature and turbidity monitoring part (46) is provided with a reverse prevention part (47), the side surface of the first water storage bin (41) is provided with an electrical connector (45), the temperature and turbidity monitoring part (46) is connected with the electrical connector (45) by cables, and the electrical connector (45) is connected with the lower-level control machine (7) by cables.

3. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 2, characterized in that: A plurality of independent channels are arranged in the water inlet (3), the number of the water inlet pipes (42) is equal to the number of the channels in the water inlet (3), and the water inlet pipes (42) correspond to the channels in the water inlet (3) one by one. The number of the temperature and turbidity monitoring parts (46) is matched with the number of the water inlet pipes (42), and the temperature and turbidity monitoring parts (46) are connected with the water inlet pipes (42) one by one.

4. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 3, characterized in that: The temperature and turbidity monitoring part (46) comprises a flow guide box (461), and the interior of the flow guide box (461) is provided with a cavity which communicates with the water inlet pipe (42). The inside of the flow guide box (461) is provided with a waterproof sealed box (462), the waterproof sealed box (462) is respectively provided with a temperature monitor (463) and a turbidity monitor (464), and the temperature monitor (463) and the turbidity monitor (464) are in communication with the lower control machine (7) through the waterproof sealed box (462).

5. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 4, characterized in that: The anti-reverse component (47) comprises a drain pipe (471) in communication with the inside of the flow guide box (461), the inside of the drain pipe (471) is provided with a sealable horizontally-slidable ball (472), the inside of the end of the drain pipe (471) away from the flow guide box (461) is provided with a support water seepage pipe (473), the outer surface of the support water seepage pipe (473) is equidistantly provided with a plurality of flow guide grooves (474), the outer surface of the support water seepage pipe (473) is provided with a reverse stopping spring (475), one end of the reverse stopping spring (475) is in contact with the outer surface of the sealable horizontally-slidable ball (472), and the other end of the reverse stopping spring (475) is in contact with the inner wall of the drain pipe (471).

6. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to any one of claims 3-5, characterized in that: The surface of the waterproof sealed box (462) is provided with a light-transmitting plate cleaning part (465), the light-transmitting plate cleaning part (465) is across the top of the turbidity monitor (464) and in contact with the outer surface of the turbidity monitor (464).

7. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 6, characterized in that: The light-transmitting plate cleaning part (465) comprises two support driving rods (4651) arranged on the two sides of the turbidity monitor (464), and the two support driving rods (4651) jointly support a scraper (4652), the scraper (4652) is horizontally movable along the axial direction of the support driving rod (4651), and the bottom of the scraper (4652) is in contact with the outer surface of the turbidity monitor (464).

8. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 1, characterized in that: The second monitoring mechanism (5) comprises a second water storage bin (51), a plurality of water diversion pipes (52) are arranged on the side of the second water storage bin (51), a water diversion pump (53) is arranged on the top of the second water storage bin (51), the water diversion pump (53) extends into the inside of the second water storage bin (51), and a plurality of water quality monitoring probes (54) are arranged on the top of the second water storage bin (51) and extend into the inside of the second water storage bin (51). The water diversion pump (53) and the water quality monitoring probe (54) are respectively connected with the lower control machine (7) through cables.

9. The device for on-line monitoring of water quality of a converter station valve external cooling water system according to claim 8, characterized in that: The water diversion pipe (52) comprises a connecting pipe (521) in communication with the second water storage bin (51), a filter hole (522) is arranged on the communication part of the connecting pipe (521) and the second water storage bin (51), a support limiting frame (523) is arranged on the end of the connecting pipe (521) in the inside of the second water storage bin (51), a limiting baffle (524) is arranged on the end of the support limiting frame (523), a dredging component (525) is arranged between the support limiting frames (523) and can be horizontally moved, and a reset spring (526) is arranged between the dredging component (525) and the limiting baffle (524). The dredging component (525) comprises a driving plate (5251), which is provided with a dust cleaning needle (5252) matched with the filter hole (522) at one end facing the filter hole (522), and the side of the driving plate (5251) is provided with a guide groove (5253) matched with the supporting limiting frame (523).

10. A method for on-line monitoring of water quality of a converter station valve external cooling water system, characterized in that: The method for online monitoring comprises the device for online monitoring of water quality of the valve external cooling water system of the converter station as claimed in any one of claims 1-9 and the following steps: S1, a plurality of conduits are extended out through the water inlet (3), the plurality of conduits are connected with a plurality of parts of the valve external cooling water system of the converter station respectively, and the cooling water is introduced into the inside of the first water storage bin (41) through the water inlet (3) in communication with the water inlet (3) through the water inlet pipe (42); S2, the cooling water enters into the inside of the flow guide box (461) before entering into the first water storage bin (41), fills the inside of the flow guide box (461), at this time, the temperature monitor (463) monitors the water temperature, the turbidity monitor (464) monitors the turbidity of the cooling water, and the monitoring data is transmitted to the lower control machine (7); S3, after the cooling water fills the inside of the first water storage bin (41) through the temperature and turbidity monitoring part (46) and the anti-reverse component (47), part of the cooling water enters into the third monitoring mechanism (6) to monitor the ammonia nitrogen content and the chemical oxygen demand through the temperature and turbidity monitoring part (46), and part of the cooling water is extracted into the inside of the second water storage bin (51) through the water pump (53), the pH value, the conductivity, the dissolved oxygen content, the total hardness, the chlorine ion content and the free chlorine content are monitored through the water quality monitoring probe (54), and the monitoring data is transmitted to the lower control machine (7); S4, after the lower control machine (7) receives the data information, the data information is uniformly transmitted to the information interaction device (9), and is transmitted to the external upper computer through the information interaction device (9), at the same time, the cooling water in the second monitoring mechanism (5) and the third monitoring mechanism (6) is circulated to the valve external cooling water system of the converter station outside for circulation; S5, the above instructions are repeated to monitor the water quality of the cooling water in the valve external cooling water system of the converter station; S6, during the monitoring of the water quality of the cooling water, the information transmission interval and the monitoring early warning threshold value can be set in real time by the operator through the external upper computer, the man-machine interaction device (10) and the electric control device (11) online.

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