Online monitoring system and monitoring method for dissolved hydrogen in stator cooling water of generator

Abstract

The invention discloses an online monitoring system and method for dissolved hydrogen in stator water of a generator. A first detection component comprises a first inlet pipe, a first outlet pipe and a first ion flow sensor; the second detection component comprises a second inlet pipe, a second outlet pipe and a second ion flow sensor; one part of liquid in the stator cooling water inlet main pipe enters the generator, and the other part of liquid enters the first inlet pipe, flows through the first ion flow sensor and then flows back to the stator cooling water tank through the first outlet pipe; one part of liquid in the stator cooling water outlet main pipe enters the stator cooling water tank, and the other part of liquid enters the second inlet pipe, flows through the second ion flow sensor and then flows back to the stator cooling water tank through the second outlet pipe. By arranging the first ion flow sensor and the second ion flow sensor, the hydrogen leakage content of liquid in the stator cooling water inlet main pipe and the stator cooling water outlet main pipe can be detected, it is not needed to wait for hydrogen to be separated out of the liquid, and measured data have high real-time performance.

Description

Technical Field

[0001] The present invention relates to the field of generators, and further to an online monitoring system and method for dissolved hydrogen in cooling water of a generator. Background Art

[0002] Thermal power generators in my country generally use a water-hydrogen-hydrogen cooling system. During operation, the stator is cooled by water, while the rotor is cooled by hydrogen. The hydrogen and water cooling interfaces are completely isolated. During generator operation, hydrogen may leak and dissolve into the water cooling medium due to equipment aging and wear. If not detected in time, this can greatly increase the risk of generator operation.

[0003] One existing system for monitoring dissolved hydrogen in cooling water involves installing a hydrogen sensor on top of the cooling water tank to monitor the hydrogen solubility in the air above the tank. This method requires waiting for hydrogen to precipitate from the cooling water and accumulate at the top of the tank. The delay between a hydrogen leak and detection by the hydrogen sensor typically takes hours or even days, resulting in significant hysteresis. Furthermore, this method can only detect free gaseous hydrogen that accumulates at the top of the cooling water tank; it cannot sense dissolved hydrogen in the cooling water, making it incapable of detecting tiny leaks at the PPB (parts per billion) level.

[0004] The existing dissolved hydrogen monitoring method is easily affected by factors such as the water level in the cooling water tank, dissolved oxygen in the water, protective gas, exhaust, water temperature, and background hydrogen in the water. The data is delayed and has poor representativeness.

[0005] When a leak occurs during the operation of the generator, hydrogen will leak into the cooling water and dissolve in it because the hydrogen pressure is higher than the water pressure. According to Henry's law, part of the hydrogen dissolved in the cooling water will diffuse from the cooling water to the upper cavity of the water tank. If the drain valve on the top of the water tank is in the closed state, the concentration of dissolved hydrogen in the cooling water and the concentration of hydrogen in the upper cavity of the water tank will slowly rise and become higher and higher. If the drain valve on the top of the water tank is in the open state, the hydrogen in the upper cavity of the water tank will continuously exchange with the atmosphere, and the concentration of dissolved hydrogen in the cooling water and the concentration of hydrogen in the upper cavity of the water tank will drop rapidly until they reach equilibrium. Existing hydrogen leakage monitoring methods are all single-side point gas phase sensor measurement methods, which mainly serve the purpose of explosion protection and cannot achieve the purpose of quantitative hydrogen leakage. Summary of the Invention

[0006] In response to the above technical problems, the purpose of the present invention is to provide an online monitoring system and monitoring method for dissolved hydrogen in the constant cooling water of a generator. By setting a first ion flow sensor and a second ion flow sensor, the hydrogen leakage content of the liquid in the constant cooling water inlet main pipe and the constant cooling water outlet main pipe can be detected. There is no need to wait for hydrogen to precipitate from the liquid, and the measurement data has high real-time performance.

[0007] In order to achieve the above object, the present invention provides an online monitoring system for dissolved hydrogen in generator cooling water, comprising:

[0008] Fixed cooling water tank;

[0009] a fixed cooling water inlet main pipe, one end of which is connected to the fixed cooling water tank, and the other end of which is suitable for connecting to the excitation end of the generator;

[0010] a fixed cooling water outlet main pipe, one end of which is connected to the fixed cooling water tank, and the other end of which is suitable for connecting to the steam end of the generator;

[0011] a first detection component, the first detection component comprising a first inlet pipe, a first outlet pipe, and a first ion flow sensor, one end of the first inlet pipe being connected to the fixed cooling water inlet main pipe, and the other end being connected to the first inlet port of the first ion flow sensor, one end of the first outlet pipe being connected to the first outlet port of the first ion flow sensor, and the other end being connected to the fixed cooling water tank;

[0012] a second detection component, the second detection component comprising a second inlet pipe, a second outlet pipe, and a second ion flow sensor, one end of the second inlet pipe being connected to the fixed cooling water outlet main pipe, and the other end being connected to the first inlet of the second ion flow sensor, one end of the second outlet pipe being connected to the first outlet of the second ion flow sensor, and the other end being connected to the fixed cooling water tank;

[0013] Part of the liquid in the fixed cooling water inlet main pipe enters the excitation end, and the other part enters the first inlet pipe, flows through the first ion flow sensor, and then flows back to the fixed cooling water tank through the first outlet pipe;

[0014] Part of the liquid in the cooling water outlet main pipe enters the cooling water tank, and the other part enters the second inlet pipe, flows through the second ion flow sensor, and then flows back to the cooling water tank through the second outlet pipe.

[0015] In some embodiments, the generator constant cooling water dissolved hydrogen online monitoring system further includes a circulating cooling mechanism, the circulating cooling mechanism including a circulating chiller, a first heat exchanger and a second heat exchanger, the first heat exchanger is sleeved on the outside of the first inlet pipe and is connected to the circulating chiller, and the liquid in the circulating chiller can flow back to the circulating chiller after passing through the first heat exchanger;

[0016] The second heat exchanger is sleeved on the outside of the second inlet pipe and is connected to the circulating chiller. The liquid in the circulating chiller can flow back to the circulating chiller after passing through the second heat exchanger.

[0017] In some embodiments, the first detection component further includes a first valve, a second valve, a third valve, and a first flow meter, wherein the first valve is disposed on the first inlet pipe between the constant cold water inlet main pipe and the first heat exchanger, the second valve and the first flow meter are sequentially disposed on the first inlet pipe between the first heat exchanger and the first ion flow sensor, and the third valve is disposed on the first outlet pipe;

[0018] The second detection component further includes a fourth valve, a fifth valve, a sixth valve and a second flow meter. The fourth valve is arranged on the second inlet pipe between the constant cold water outlet main pipe and the second heat exchanger. The fifth valve and the second flow meter are arranged in sequence on the second inlet pipe between the second heat exchanger and the second ion flow sensor. The sixth valve is arranged on the second outlet pipe.

[0019] In some embodiments, the generator constant cooling water dissolved hydrogen online monitoring system further includes a calibration system, which includes a liquid containing cup and a metering pump, one end of the metering pump is connected to the liquid containing cup, and the other end is respectively connected to the first inlet of the first ion flow sensor and the first inlet of the second ion flow sensor; the liquid containing cup is also connected to the first outlet and the first outlet, and the metering pump can drive the liquid in the liquid containing cup to enter the first ion flow sensor from the first inlet and then flow back to the liquid containing cup through the first outlet, and drive the liquid in the liquid containing cup to enter the second ion flow sensor from the first inlet and then flow back to the liquid containing cup through the first outlet.

[0020] In some embodiments, the calibration system further comprises a first calibration tube, a second calibration tube, a third calibration tube, a first return tube, a second return tube, and a third return tube;

[0021] One end of the first calibration tube is connected to the liquid-containing cup, one end of the second calibration tube is connected to the fixed cold water inlet main pipe, and the other end is connected to the end of the first calibration tube away from the liquid-containing cup, and one end of the third calibration tube is connected to the fixed cold water outlet main pipe, and the other end is connected to the end of the first calibration tube away from the liquid-containing cup;

[0022] One end of the first reflux pipe is in communication with the liquid-containing cup, one end of the second reflux pipe is in communication with the first exit, and the other end is in communication with the end of the first reflux pipe away from the liquid-containing cup, and one end of the third reflux pipe is in communication with the first outlet, and the other end is in communication with the end of the first reflux pipe away from the liquid-containing cup;

[0023] The metering pump is arranged on the first calibration tube.

[0024] In some embodiments, the calibration system further includes a standard substance gas cylinder and a third flow meter, the standard substance gas cylinder is connected to the liquid containing cup, and the third flow meter is arranged on the connecting pipe between the standard substance gas cylinder and the liquid containing cup.

[0025] In some embodiments, the first ion current sensor further includes a second exit port, the first entrance port is located on one side of the first ion current sensor, the first exit port is located on the top of the first ion current sensor, and the second exit port is located at the bottom of the first ion current sensor;

[0026] The second ion current sensor further includes a second outlet, the first inlet is located on one side of the second ion current sensor, the first outlet is located at the top of the second ion current sensor, and the second outlet is located at the bottom of the second ion current sensor;

[0027] The second exit and the second outlet are respectively connected to the liquid containing cup. When the first exit is connected to the outside air, the liquid in the detection cavity of the first ion flow sensor can flow back to the liquid containing cup through the second exit; when the second outlet is connected to the outside air, the liquid in the detection cavity of the second ion flow sensor can flow back to the liquid containing cup through the second outlet.

[0028] In some embodiments, the calibration system further includes a first connecting pipe and a second connecting pipe;

[0029] The calibration system further includes a first air valve and a second air valve; one end of the first connecting pipe is connected to the first exit, and the other end is provided with the first air valve; when the first air valve is opened, the first connecting pipe is connected to the outside world; when the first air valve is closed, the first connecting pipe is isolated from the outside world;

[0030] One end of the second connecting pipe is connected to the first outlet, and the other end is provided with a second air valve; when the second air valve is opened, the second connecting pipe is connected to the outside; when the second air valve is closed, the second connecting pipe is isolated from the outside;

[0031] One end of the first inlet pipe away from the constant cold water inlet main pipe is connected to the first connecting pipe;

[0032] One end of the second inlet pipe away from the constant cold water outlet main pipe is connected to the second connecting pipe;

[0033] One end of the second return pipe away from the first return pipe is connected to the first connecting pipe;

[0034] One end of the third return pipe away from the first return pipe is communicated with the second communicating pipe.

[0035] In some embodiments, the calibration system further includes a fourth reflux pipe, a fifth reflux pipe and a sixth reflux pipe; one end of the fourth reflux pipe is connected to the liquid-containing cup; one end of the fifth reflux pipe is connected to the second exit, and the other end is connected to the end of the fourth reflux pipe away from the liquid-containing cup; one end of the sixth reflux pipe is connected to the second outlet, and the other end is connected to the end of the fourth reflux pipe away from the liquid-containing cup.

[0036] In some embodiments, a fourth flow meter is provided on the constant cooling water inlet main pipe, and a fifth flow meter is provided on the constant cooling water outlet main pipe.

[0037] According to another aspect of the present application, there is further provided a method for online monitoring of dissolved hydrogen in cooling water of a generator based on the online monitoring system for dissolved hydrogen in cooling water of a generator according to any one of the above claims, comprising:

[0038] guiding part of the liquid in the fixed cooling water inlet main pipe into the first ion flow sensor through the first inlet pipe and the first inlet port of the first ion flow sensor, and returning to the fixed cooling water tank through the first outlet port of the first ion flow sensor and the first outlet pipe;

[0039] Part of the liquid in the cooling water outlet main pipe is guided into the second ion flow sensor through the second inlet pipe and the first inlet of the second ion flow sensor, and flows back to the cooling water tank through the first outlet and the second outlet pipe of the second ion flow sensor.

[0040] In some embodiments, guiding part of the liquid in the constant cooling water inlet main pipe to flow to the first ion current sensor and the liquid in the first ion current sensor to flow back to the constant cooling water tank is stopped;

[0041] guiding part of the liquid in the liquid-containing cup to enter the first ion current sensor through the first calibration tube, the second calibration tube, and the first inlet, and to flow back to the liquid-containing cup through the first outlet, the second return tube, and the first return tube;

[0042] Stop guiding the liquid in the fixed cooling water outlet main pipe to flow to the second ion flow sensor, and stop guiding the liquid in the second ion flow sensor to flow back to the fixed cooling water tank;

[0043] Part of the liquid in the liquid containing cup is guided into the second ion flow sensor through the first calibration tube, the third calibration tube and the first inlet, and flows back to the liquid containing cup through the first outlet, the third return tube and the first return tube.

[0044] In some embodiments, the first ion current sensor further includes a second exit port, the first entrance port is located on a side of the first ion current sensor, the first exit port is located at the top of the first ion current sensor, and the second exit port is located at the bottom of the first ion current sensor;

[0045] The second ion current sensor further includes a second outlet, the first inlet is located on one side of the second ion current sensor, the first outlet is located at the top of the second ion current sensor, and the second outlet is located at the bottom of the second ion current sensor;

[0046] Stop guiding the liquid in the liquid containing cup to flow toward the first ion current sensor, and stop guiding the liquid in the first ion current sensor to flow back to the liquid containing cup;

[0047] guiding external air into the first ion flow sensor through the first exit port while guiding the liquid in the first ion flow sensor to flow back to the liquid containing cup through the second exit port, the fifth return pipe, and the fourth return pipe;

[0048] Stop guiding the liquid in the liquid containing cup to flow toward the second ion current sensor, and stop guiding the liquid in the second ion current sensor to flow back to the liquid containing cup;

[0049] External air is guided to enter the second ion flow sensor through the first outlet, while liquid in the second ion flow sensor is guided to flow back to the liquid containing cup through the second outlet, the sixth return pipe, and the fourth return pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0051] Figure 12 is a schematic structural diagram of a first fluid flow state of an online monitoring system for dissolved hydrogen in cooling water of a generator according to a preferred embodiment of the present invention;

[0052] Figure 2 2 is a schematic structural diagram of a second fluid flow state of an online monitoring system for dissolved hydrogen in cooling water of a generator according to a preferred embodiment of the present invention;

[0053] Figure 3 2 is a schematic structural diagram of a third fluid flow state of an online monitoring system for dissolved hydrogen in cooling water of a generator according to a preferred embodiment of the present invention;

[0054] Figure 4 2 is a schematic structural diagram of a first ion flow sensor of an online monitoring system for dissolved hydrogen in generator cooling water according to a preferred embodiment of the present invention;

[0055] Figure 5 This is a flow chart of a method for online monitoring of dissolved hydrogen in cold water according to a preferred embodiment of the present invention;

[0056] Figure 6 This is a flow chart of a sub-process of a method for online monitoring of dissolved hydrogen in cold water according to a preferred embodiment of the present invention;

[0057] Figure 7 This is a flow chart of another sub-process of the method for online monitoring of dissolved hydrogen in cold water according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0059] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0060] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0061] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0062] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0063] refer to Figures 1 to 4 The present application provides an online monitoring system 100 for dissolved hydrogen in a generator's cooling water. The system 100 includes a cooling water tank 11, a cooling water inlet main pipe 12, and a cooling water outlet main pipe 13. One end of the cooling water inlet main pipe 12 is connected to the cooling water tank 11, and the other end is adapted to be connected to the excitation end of a generator 14. One end of the cooling water outlet main pipe 13 is connected to the cooling water tank 11, and the other end is adapted to be connected to the steam end of the generator.

[0064] The cooling water tank 11 is suitable for storing cooling liquid, such as, but not limited to, water. The cooling liquid in the cooling water tank 11 can enter the excitation end of the generator 14 through the cooling water inlet main pipe 12. This cooling liquid is mainly used to cool the stator of the generator. The liquid at the steam end of the generator 14 can flow back to the cooling water tank 11 through the cooling water outlet main pipe 13, thus completing one cycle. The liquid can then enter the cooling water inlet main pipe 12 again to complete the next cycle.

[0065] The generator cooling water dissolved hydrogen online monitoring system 100 further includes a first detection component 20 and a second detection component 30. The first detection component 20 includes a first inlet pipe 21, a first outlet pipe 22, and a first ion flow sensor 23. One end of the first inlet pipe 21 is connected to the cooling water inlet main pipe 12, and the other end is connected to the first inlet port 231 of the first ion flow sensor 23. One end of the first outlet pipe 22 is connected to the first outlet port 232 of the first ion flow sensor 23, and the other end is connected to the cooling water tank 11.

[0066] The second detection component 30 includes a second inlet pipe 31, a second outlet pipe 32 and a second ion flow sensor 33. One end of the second inlet pipe 31 is connected to the fixed cold water outlet main pipe 13, and the other end is connected to the first inlet 331 of the second ion flow sensor 33. One end of the second outlet pipe 32 is connected to the first outlet 332 of the second ion flow sensor 33, and the other end is connected to the fixed cold water tank 11.

[0067] During operation, part of the liquid in the cooling water inlet main pipe 12 enters the excitation end of the generator 14 to cool the stator of the generator, and the other part enters the first inlet pipe 21, flows through the first ion flow sensor 23, and then flows back to the cooling water tank 11 through the first outlet pipe 22. Specifically, the liquid in the first inlet pipe 21 can enter the first ion flow sensor 23 through the first inlet port 231, and leave through the first outlet port 232 to enter the first outlet pipe 22, and flow back to the cooling water tank 11 through the first outlet pipe 22. The first ion flow sensor 23 can detect the first hydrogen value in the liquid flowing through, that is, the dissolved hydrogen content in the cooling water inlet main pipe 12.

[0068] Part of the liquid in the fixed-cold water outlet main pipe 13 enters the fixed-cold water tank 11, and the other part enters the second inlet pipe 31, flows through the second ion flow sensor 33, and then flows back to the fixed-cold water tank 11 through the second outlet pipe 32. Specifically, the liquid in the second inlet pipe 31 can enter the second ion flow sensor 33 through the first inlet 331, exit through the first outlet 332 and enter the second outlet pipe 32, and then flow back to the fixed-cold water tank 11 through the second outlet pipe 32. The second ion flow sensor 33 can detect the second hydrogen value in the liquid flowing through, that is, the dissolved hydrogen content in the fixed-cold water outlet main pipe 13.

[0069] It should be noted that most of the liquid in the cooling water inlet main pipe 12 enters the excitation end of the generator 14 to cool the generator's stator, and a small portion enters the first inlet pipe 21. The liquid flow rate into the first inlet pipe 21 is between 100ml / min and 600ml / min, preferably 400ml / min. Similarly, most of the liquid in the cooling water outlet main pipe 13 enters the cooling water tank 11, and a small portion enters the second inlet pipe 31. The liquid flow rate into the second inlet pipe 31 is between 100ml / min and 600ml / min, preferably 400ml / min.

[0070] In the present application, by setting the first ion flow sensor 23, the hydrogen content of the liquid in the fixed cooling water inlet main pipe 12 can be detected, and by setting the second ion flow sensor 33, the hydrogen content of the liquid in the fixed cooling water outlet main pipe 13 can be detected. The first ion flow sensor 23 and the second ion flow sensor 33 can directly detect the hydrogen content dissolved in the liquid without waiting for hydrogen to precipitate from the liquid, and the measurement data has high real-time performance.

[0071] It should also be noted that the first ion flow sensor 23 measures the dissolved hydrogen value in the cooling water inlet main pipe 12, that is, the value before the liquid enters the generator 14. The second ion flow sensor 33 measures the dissolved hydrogen value in the cooling water outlet main pipe 13, that is, the value after the liquid enters the generator 14. If there is a hydrogen leak in the generator 14, the second hydrogen value will be greater than the first hydrogen value. The difference between the first and second hydrogen values ​​can be used to estimate the hydrogen leakage rate in the generator 14.

[0072] refer to Figure 1 Specifically, the generator cooling water dissolved hydrogen online detection system further includes a manifold 15, and the liquid in the first exit pipe 22 and the second exit pipe 32 first flows back to the manifold 15, and then flows back to the cooling water tank 11 from the manifold 15.

[0073] refer to Figure 1 Specifically, the first detection component 20 further includes a first valve 241, a second valve 242, a third valve 243 and a first flowmeter 244. The first valve 241, the second valve 242 and the first flowmeter 244 are sequentially arranged on the first inlet pipe 21, and the liquid flowing from the fixed cold water inlet main pipe 12 to the first ion flow sensor 23 can flow through the first valve 241, the second valve 242 and the first flowmeter 244 in sequence. The third valve 243 is arranged on the first outlet pipe 22. The first valve 241 and the second valve 242 are used to control the on-off of the first inlet pipe 21, and the third valve 243 is used to control the on-off of the first outlet pipe 22. The first flowmeter 244 is used to measure the flow of liquid entering the first ion flow sensor 23 from the fixed cold water inlet main pipe 12.

[0074] The second detection component 30 further includes a fourth valve 341, a fifth valve 342, a sixth valve 343 and a second flowmeter 344. The fourth valve 341, the fifth valve 342 and the second flowmeter 344 are sequentially arranged on the second inlet pipe 31, and the liquid flowing from the fixed cold water outlet main pipe 13 to the second ion flow sensor 33 can flow through the fourth valve 341, the fifth valve 342 and the second flowmeter 344 in sequence. The sixth valve 343 is arranged on the second outlet pipe 32. The fourth valve 341 and the fifth valve 342 are used to control the on-off of the second inlet pipe 31, and the sixth valve 343 is used to control the on-off of the second outlet pipe 32. The second flowmeter 344 is used to measure the flow of liquid entering the second ion flow sensor 33 from the fixed cold water outlet main pipe 13.

[0075] refer to Figure 1 Furthermore, the generator constant cooling water dissolved hydrogen online monitoring system 100 further includes a circulating cooling mechanism 40, which includes a circulating chiller 41, a first heat exchanger 42, and a second heat exchanger 43. The first heat exchanger 42 is sleeved on the outside of the first inlet pipe 21 and is connected to the circulating chiller 41. The liquid in the circulating chiller 41 can flow back to the circulating chiller 41 after passing through the first heat exchanger 42. The second heat exchanger 43 is sleeved on the outside of the second inlet pipe 31 and is connected to the circulating chiller 41. The liquid in the circulating chiller 41 can flow back to the circulating chiller 41 after passing through the second heat exchanger 43.

[0076] Specifically, the first valve 241 is provided on the first inlet pipe 21 between the fixed cold water inlet main pipe 12 and the first heat exchanger 42, the second valve 242 and the first flow meter 244 are sequentially provided on the first inlet pipe 21 between the first heat exchanger 42 and the first ion flow sensor 23. The fourth valve 341 is provided on the second inlet pipe 31 between the fixed cold water outlet main pipe 13 and the second heat exchanger 43, and the fifth valve 342 and the second flow meter 344 are sequentially provided on the second inlet pipe 31 between the second heat exchanger 43 and the second ion flow sensor 33.

[0077] The circulating cooling mechanism 40 can adjust the temperature of the liquid entering the first ion current sensor 23 and the second ion current sensor 33 so that the first ion current sensor 23 and the second ion current sensor 33 operate at the same temperature, eliminating the interference of temperature on the detection results.

[0078] Specifically, during operation, the liquid in the circulating chiller 41 enters the first heat exchanger 42, enters the second heat exchanger 43 after leaving the first heat exchanger 42, and then flows back to the circulating chiller 41 after leaving the second heat exchanger 43. In some embodiments, a portion of the liquid in the circulating chiller 41 flows directly back to the circulating chiller 41 after entering the first heat exchanger 42; another portion of the liquid in the circulating chiller 41 flows directly back to the circulating chiller 41 after entering the second heat exchanger 43.

[0079] refer to Figure 2 and Figure 3 Furthermore, the generator constant cooling water dissolved hydrogen online monitoring system 100 further includes a calibration system 50, which includes a liquid cup 51 and a metering pump 52, one end of the metering pump 52 is connected to the liquid cup 51, and the other end is respectively connected to the first inlet 231 of the first ion flow sensor 23 and the first inlet 331 of the second ion flow sensor 33; the liquid cup 51 is also connected to the first outlet 232 and the first outlet 332, and the metering pump 52 can drive the liquid in the liquid cup 51 to enter the first ion flow sensor 23 from the first inlet 231 and then flow back to the liquid cup 51 through the first outlet 232, and drive the liquid in the liquid cup 51 to enter the second ion flow sensor 33 from the first inlet 331 and then flow back to the liquid cup 51 through the first outlet 332.

[0080] The liquid cup 51 contains a standard liquid. The standard liquid can be pure water without dissolved hydrogen, or a liquid containing a preset dissolved hydrogen content. When calibration is required, the second valve 242 and the third valve 243 are first closed, and the fifth valve 342 and the sixth valve 343 are closed. The liquid in the liquid cup 51 is then pumped to the first ion flow sensor 23 and the second ion flow sensor 33 via the metering pump 52. The liquid that leaves the first ion flow sensor 23 and the second ion flow sensor 33 then flows back into the liquid cup 51.

[0081] The calibration system 50 provided in the present application can complete online calibration of the first ion current sensor 23 and the second ion current sensor 33, that is, there is no need to remove the first ion current sensor 23 and the second ion current sensor 33 from the system, and can allow the first ion current sensor 23 and the second ion current sensor 33 to perform measurements under the condition of continuous liquid flow. The test environment is closer to the actual working conditions, which can improve the accuracy of the calibration results.

[0082] refer to Figure 2Specifically, the calibration system 50 further includes a first calibration tube 531 , a second calibration tube 532 , a third calibration tube 533 , a first return tube 541 , a second return tube 542 and a third return tube 543 .

[0083] One end of the first calibration tube 531 is connected to the liquid cup 51, one end of the second calibration tube 532 is connected to the fixed cold water inlet main pipe 12, and the other end is connected to the end of the first calibration tube 531 away from the liquid cup 51, and one end of the third calibration tube 533 is connected to the fixed cold water outlet main pipe 13, and the other end is connected to the end of the first calibration tube 531 away from the liquid cup 51.

[0084] One end of the first reflux pipe 541 is connected to the liquid cup 51, one end of the second reflux pipe 542 is connected to the first exit 232, and the other end is connected to the end of the first reflux pipe 541 away from the liquid cup 51, and one end of the third reflux pipe 543 is connected to the first outlet 332, and the other end is connected to the end of the first reflux pipe 541 away from the liquid cup 51.

[0085] The metering pump 52 is disposed in the first calibration tube 531. During operation, the liquid in the liquid-containing cup 51 first enters the first calibration tube 531. A portion of the liquid in the first calibration tube 531 enters the second calibration tube 532 and enters the first ion flow sensor 23 through a portion of the first inlet tube 21. Another portion of the liquid in the first calibration tube 531 enters the third calibration tube 533 and enters the second ion flow sensor 33 through a portion of the second inlet tube 31. The liquid after leaving the first ion flow sensor 23 enters the second return tube 542. The liquid after leaving the second ion flow sensor 33 enters the third return tube 543. The liquid in the second return tube 542 and the third return tube 543 merges and then enters the third return tube 543, where it flows back to the liquid-containing cup 51 through the third return tube 543.

[0086] refer to Figure 2Furthermore, the calibration system 50 further includes a first three-way valve 551, a second three-way valve 552, a third three-way valve 553, a fourth three-way valve 554, a fifth three-way valve 555, and a sixth three-way valve 556. The first three-way valve 551 is disposed at the connection point between the first calibration pipe 531, the second calibration pipe 532, and the third calibration pipe 533; the second three-way valve 552 is disposed at the connection point between the second return pipe 542 and the first inlet pipe 21; the third three-way valve 553 is disposed at the connection point between the third return pipe 543 and the second inlet pipe 31. The fourth three-way valve 554 is disposed at the connection point between the first return pipe 541, the second return pipe 542, and the third return pipe 543.

[0087] The calibration system 50 further includes a first connecting pipe 561 and a second connecting pipe 562. The calibration system 50 also includes a first air valve 563 and a second air valve 564. One end of the first connecting pipe 561 is connected to the first exit 232, and the other end is provided with the first air valve 563. When the first air valve 563 is opened, the first connecting pipe 561 is connected to the outside world; when the first air valve 563 is closed, the first connecting pipe 561 is isolated from the outside world. One end of the second connecting pipe 562 is connected to the first outlet 332, and the other end is provided with the second air valve 564. When the second air valve 564 is opened, the second connecting pipe 562 is connected to the outside world; when the second air valve 564 is closed, the second connecting pipe 562 is isolated from the outside world.

[0088] The end of the first inlet pipe 21 away from the constant cold water inlet main pipe 12 is connected to the first connecting pipe 561. The calibration system 50 further includes a seventh three-way valve 557, which is provided at the connection point between the first inlet pipe 21 and the first connecting pipe 561.

[0089] The end of the second inlet pipe 31 away from the constant cold water outlet main pipe 13 is connected to the second connecting pipe 562. The calibration system 50 further includes an eighth three-way valve 558, which is provided at the connection point between the second inlet pipe 31 and the second connecting pipe 562.

[0090] One end of the second return pipe 542 away from the first return pipe 541 is connected to the first connecting pipe 561. The fifth three-way valve 555 is provided at the connection point between the second return pipe 542 and the first connecting pipe 561.

[0091] The end of the third return pipe 543 away from the first return pipe 541 is connected to the second connecting pipe 562. The sixth three-way valve 556 is provided at the connection point between the third return pipe 543 and the second connecting pipe 562.

[0092] refer to Figure 2 Furthermore, the calibration system 50 further includes a first calibration valve 571, a second calibration valve 572, a third calibration valve 573, and a fourth calibration valve 574. The first calibration valve 571 is disposed in the second calibration pipe 532, the second calibration valve 572 is disposed in the third calibration pipe 533, the third calibration valve 573 is disposed in the second return pipe 542, and the fourth calibration valve 574 is disposed in the third return pipe 543. The first calibration valve 571, the second calibration valve 572, the third calibration valve 573, and the fourth calibration valve 574 are respectively used to control the opening or closing of the corresponding pipelines, and will not be described in detail here.

[0093] refer to Figure 2 Furthermore, the calibration system 50 further includes a standard material gas cylinder 581 and a third flow meter 582. The standard material gas cylinder 581 is connected to the liquid containing cup 51, and the third flow meter 582 is provided on the connecting pipe between the standard material gas cylinder 581 and the liquid containing cup 51. Liquid can be added to the liquid containing cup 51 through the standard material gas cylinder 581, and the third flow meter 582 can measure the amount of liquid added to the liquid containing cup 51 from the standard material gas cylinder 581.

[0094] Specifically, the calibration system 50 further includes an air supply pipe, one end of which is connected to the standard material cylinder 581 and the other end of which is connected to the liquid container 51 . The third flowmeter 582 is disposed on the air supply pipe.

[0095] refer to Figure 3 Furthermore, the first ion flow sensor 23 also includes a second exit 233, the first entrance 231 is located on one side of the first ion flow sensor 23, the first exit 232 is located at the top of the first ion flow sensor 23, and the second exit 233 is located at the bottom of the first ion flow sensor 23.

[0096] The second ion current sensor 33 further includes a second outlet 333 . The first inlet 331 is located at one side of the second ion current sensor 33 . The first outlet 332 is located at the top of the second ion current sensor 33 . The second outlet 333 is located at the bottom of the second ion current sensor 33 .

[0097] The second exit 233 and the second outlet 333 are respectively connected to the liquid containing cup 51. When the first exit 232 is connected to the outside air, the liquid in the detection cavity of the first ion flow sensor 23 can flow back to the liquid containing cup 51 through the second exit 233; when the second outlet 333 is connected to the outside air, the liquid in the detection cavity of the second ion flow sensor 33 can flow back to the liquid containing cup 51 through the second outlet 333.

[0098] Specifically, the first air valve 563 is opened, so that the first connecting tube 561 is connected to the outside, thereby connecting the first exit 232 to the outside, so that the liquid in the detection cavity of the first ion flow sensor 23 can flow back to the liquid containing cup 51 through the second exit 233 under the action of gravity.

[0099] The second air valve 564 is opened to connect the second connecting pipe 562 to the outside, thereby connecting the first outlet 332 to the outside, so that the liquid in the detection cavity of the second ion flow sensor 33 flows back to the liquid containing cup 51 through the second opening 333 under the action of gravity.

[0100] refer to Figure 3 Furthermore, the calibration system 50 further includes a fourth reflux pipe 544, a fifth reflux pipe 545, and a sixth reflux pipe 546. One end of the fourth reflux pipe 544 is connected to the liquid-containing cup 51; one end of the fifth reflux pipe 545 is connected to the second exit 233, and the other end is connected to the end of the fourth reflux pipe 544 away from the liquid-containing cup 51; one end of the sixth reflux pipe 546 is connected to the second outlet 333, and the other end is connected to the end of the fourth reflux pipe 544 away from the liquid-containing cup 51.

[0101] The calibration system 50 further includes a ninth three-way valve 559 . The ninth three-way valve 559 is disposed at a connection point among the fourth return pipe 544 , the fifth return pipe 545 , and the sixth return pipe 546 .

[0102] The calibration system 50 further includes a fifth calibration valve 575 and a sixth calibration valve 576. The fifth calibration valve 575 is disposed on the fifth return pipe 545 to control the opening and closing of the fifth return pipe 545. The sixth calibration valve 576 is disposed on the sixth return pipe 546 to control the opening and closing of the sixth return pipe 546.

[0103] refer to Figure 1The generator cooling water dissolved hydrogen online monitoring system 100 further includes a fourth flowmeter 583 and a fifth flowmeter 584. The fourth flowmeter 583 is disposed on the cooling water inlet main pipe 12 and is used to measure the amount of liquid flowing from the cooling water tank 11 to the excitation end of the generator 14. The fifth flowmeter 584 is disposed on the cooling water outlet main pipe 13 and is used to measure the amount of liquid flowing from the steam end of the generator 14 to the cooling water tank 11. It should be noted that based on the first liquid volume flowing through the first ion current sensor 23 per unit time measured by the first flowmeter 244 and the solubility data measured by the first ion current sensor 23, the first hydrogen content dissolved in the first liquid volume can be calculated. Specifically, by obtaining the dissolved hydrogen concentration data measured by the first ion current sensor 23 and the second ion current sensor 33, calculating the difference between the two, and then combining the liquid flow data measured by the fourth flowmeter 583 and the fifth flowmeter 584, the hourly cumulative hydrogen leakage or daily cumulative hydrogen leakage within the generator 14 can be calculated. For example, assuming that the data measured by the first ion flow sensor 23 is A, the data measured by the second ion flow sensor 33 is B, and the data measured by the fourth flow meter 583 is Q (the data measured by the fifth flow meter 584 is the same as the data measured by the fourth flow meter 583, also Q), then the daily cumulative hydrogen leakage amount = , where a is a constant determined based on the volume and pressure of hydrogen.

[0104] refer to Figure 4Furthermore, the first ion flow sensor 23 includes a housing 61, which has a first chamber 62 and a second chamber 63 adjacent to each other. The first chamber 62 and the second chamber 63 are separated by a proton exchange membrane 64. The first inlet 231 is connected to the first chamber 62, and the first outlet 232 and the second outlet 233 are both connected to the second chamber 63. The proton exchange membrane 64 is preferably a Nafion membrane (nafion nr 50 (beads 10-35 mesh), a perfluorosulfonic acid membrane). During operation, when liquid enters the first chamber 62 from the first inlet 231 and contacts the proton exchange membrane 64, the proton exchange membrane 64 contacts the hydrogen ions in the liquid and allows the hydrogen ions to pass through and enter the second chamber 63. The first ion flow sensor 23 can also apply a constant voltage to the liquid to drive the hydrogen ions in the liquid in the first chamber 62 to move into the second chamber 63. As the ions continue to migrate, the target ions on the surface of the proton exchange membrane (close to the detection side) are rapidly consumed, and the ions in the solution body need to be replenished to the membrane surface by diffusion. When the applied voltage is large enough, the reaction rate of the ions on the working electrode surface is much faster than the diffusion replenishment rate. At this time, the ion flow (current) reaches a maximum value and no longer increases with increasing voltage. This is called the limiting ion current. Based on this limiting ion current, the concentration of hydrogen ions in the liquid can be determined.

[0105] refer to Figure 5 、 Figure 6 as well as Figure 7 According to another aspect of the present application, there is further provided a method for online monitoring of dissolved hydrogen in cooling water of a generator based on the online monitoring system for dissolved hydrogen in cooling water of the generator according to the above embodiment, comprising:

[0106] Step 101: guiding part of the liquid in the cooling water inlet main pipe 12 into the first ion flow sensor 23 through the first inlet pipe 21 and the first inlet port 231 of the first ion flow sensor 23, and returning to the cooling water tank 11 through the first outlet port 232 of the first ion flow sensor 23 and the first outlet pipe 22;

[0107] Step 102: Guide part of the liquid in the cooling water outlet main pipe 13 into the second ion flow sensor 33 through the second inlet pipe 31 and the first inlet 331 of the second ion flow sensor 33, and flow back to the cooling water tank 11 through the first outlet 332 and the second outlet pipe 32 of the second ion flow sensor 33.

[0108] In the online monitoring method for dissolved hydrogen in fixed cooling water provided in the present application, part of the liquid in the fixed cooling water inlet main pipe 12 is diverted to the first ion flow sensor 23, and part of the liquid in the fixed cooling water outlet main pipe 13 is diverted to the second ion flow sensor 33. The hydrogen content of the liquid in the fixed cooling water inlet main pipe 12 can be detected by the first ion flow sensor 23, and the hydrogen content of the liquid in the fixed cooling water outlet main pipe 13 can be detected by setting the second ion flow sensor 33. The first ion flow sensor 23 and the second ion flow sensor 33 can directly detect the hydrogen content dissolved in the liquid without waiting for hydrogen to precipitate from the liquid, and the measurement data has high real-time performance.

[0109] refer to Figure 6 Furthermore, the online monitoring method for dissolved hydrogen in constant cold water provided by the present application further includes:

[0110] Step 201: Stop guiding part of the liquid in the cooling water inlet main pipe 12 to flow toward the first ion flow sensor 23, and return the liquid in the first ion flow sensor 23 to the cooling water tank 11;

[0111] Step 202: guiding part of the liquid in the liquid-containing cup 51 into the first ion current sensor 23 through the first calibration tube 531 , the second calibration tube 532 , and the first inlet 231 , and returning to the liquid-containing cup 51 through the first outlet 232 , the second return tube 542 , and the first return tube 541 ;

[0112] Step 203: Stop guiding the liquid in the constant cooling water outlet main pipe 13 to flow toward the second ion flow sensor 33 , and allow the liquid in the second ion flow sensor 33 to flow back to the constant cooling water tank 11 ;

[0113] Step 204 : guiding part of the liquid in the liquid-containing cup 51 into the second ion flow sensor 33 through the first calibration tube 531 , the third calibration tube 533 and the first inlet 331 , and returning to the liquid-containing cup 51 through the first outlet 332 , the third return tube 543 and the first return tube 541 .

[0114] In the online monitoring method for dissolved hydrogen in constant cold water provided in the present application, by guiding the liquid in the liquid holding cup 51 to the first ion flow sensor 23 and the second ion flow sensor 33, and guiding the liquid after passing through the first ion flow sensor 23 and the second ion flow sensor 33 to flow back to the liquid holding cup 51, the first ion flow sensor 23 and the second ion flow sensor 33 can be calibrated in the presence of liquid in a simulated working state, and the first ion flow sensor 23 and the second ion flow sensor 33 do not need to be disassembled during the calibration process, and calibration can be performed very conveniently.

[0115] Specifically, to stop directing part of the liquid in the cooling water inlet main pipe 12 to flow to the first ion flow sensor 23, the first valve 241 or the second valve 242 needs to be closed. To stop directing the liquid in the first ion flow sensor 23 to flow back to the cooling water tank 11, the third valve 243 needs to be closed.

[0116] To guide some of the liquid in the liquid-containing cup 51 into the first ion current sensor 23 through the first calibration tube 531, the second calibration tube 532, and the first inlet 231, the first calibration valve 571 needs to be opened. To guide the liquid in the first ion current sensor 23 back to the liquid-containing cup 51 through the first outlet 232, the second return tube 542, and the first return tube 541, the third calibration valve 573 needs to be opened.

[0117] To stop directing the liquid in the cold water outlet main pipe 13 from flowing to the second ion flow sensor 33, the fourth valve 341 or the fifth valve 342 needs to be closed. To stop directing the liquid in the second ion flow sensor 33 from flowing back to the cold water tank 11, the sixth valve 343 needs to be closed.

[0118] To guide some of the liquid in the liquid-containing cup 51 into the second ion current sensor 33 through the first calibration tube 531, the third calibration tube 533, and the first inlet 331, the second calibration valve 572 needs to be opened. To guide the liquid in the second ion current sensor 33 back to the liquid-containing cup 51 through the first outlet 332, the third return tube 543, and the first return tube 541, the fourth calibration valve 574 needs to be opened.

[0119] The first ion current sensor 23 further includes a second exit 233, the first inlet 231 is located on a side of the first ion current sensor 23, the first exit 232 is located at the top of the first ion current sensor 23, and the second exit 233 is located at the bottom of the first ion current sensor 23. The second ion current sensor 33 further includes a second exit 333, the first inlet 331 is located on a side of the second ion current sensor 33, the first exit 332 is located at the top of the second ion current sensor 33, and the second exit 333 is located at the bottom of the second ion current sensor 33.

[0120] refer to Figure 7 Furthermore, the online monitoring method for dissolved hydrogen in constant cold water provided by the present application further comprises:

[0121] Step 301: Stop guiding the liquid in the liquid cup 51 to flow toward the first ion current sensor 23, and allow the liquid in the first ion current sensor 23 to flow back to the liquid cup 51;

[0122] Step 302: guiding the outside air into the first ion flow sensor 23 through the first exit 232 and guiding the liquid in the first ion flow sensor 23 to flow back to the liquid holding cup 51 through the second exit 233, the fifth return pipe 545 and the fourth return pipe 544;

[0123] Step 303: Stop guiding the liquid in the liquid cup 51 to flow toward the second ion flow sensor 33 and allow the liquid in the second ion flow sensor 33 to flow back to the liquid cup 51;

[0124] Step 304 : guiding the outside air into the second ion flow sensor 33 through the first outlet 332 , while guiding the liquid in the second ion flow sensor 33 to flow back to the liquid containing cup 51 through the second outlet 333 , the sixth return pipe 546 , and the fourth return pipe 544 .

[0125] In the online monitoring method for dissolved hydrogen in constant cold water provided in the present application, by discharging the liquid in the first ion flow sensor 23 and the second ion flow sensor 33 into the liquid holding cup 51, the first ion flow sensor 23 and the second ion flow sensor 33 can detect the hydrogen content in the outside air, thereby completing the zero point calibration of the first ion flow sensor 23 and the second ion flow sensor 33. Similarly, the first ion flow sensor 23 and the second ion flow sensor 33 do not need to be disassembled during the calibration process.

[0126] Specifically, to stop directing the liquid in the liquid cup 51 to flow toward the first ion current sensor 23 , the first calibration valve 571 needs to be closed. To stop directing the liquid in the first ion current sensor 23 to flow back to the liquid cup 51 , the third calibration valve 573 needs to be closed.

[0127] To guide the outside air into the first ion flow sensor 23 through the first exit 232 and at the same time guide the liquid in the first ion flow sensor 23 to flow back to the liquid containing cup 51 through the second exit 233, the fifth return pipe 545 and the fourth return pipe 544, it is necessary to open the first air valve 563 and the fifth calibration valve 575.

[0128] To stop directing the liquid in the liquid cup 51 to flow toward the second ion current sensor 33 , the second calibration valve 572 needs to be closed. To stop directing the liquid in the second ion current sensor 33 to flow back to the liquid cup 51 , the fourth calibration valve 574 needs to be closed.

[0129] To guide the outside air into the second ion flow sensor 33 through the first outlet 332 and at the same time guide the liquid in the second ion flow sensor 33 to flow back to the liquid containing cup 51 through the second outlet 333, the sixth return pipe 546 and the fourth return pipe 544, it is necessary to open the second air valve 564 and the sixth calibration valve 576.

[0130] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. An online monitoring system for dissolved hydrogen in generator cooling water, characterized in that: include: Fixed cooling water tank; a fixed cooling water inlet main pipe, one end of which is connected to the fixed cooling water tank, and the other end of which is suitable for connecting to the excitation end of the generator; a fixed cooling water outlet main pipe, one end of which is connected to the fixed cooling water tank, and the other end of which is suitable for connecting to the steam end of the generator; a first detection component, the first detection component comprising a first inlet pipe, a first outlet pipe, and a first ion flow sensor, one end of the first inlet pipe being connected to the fixed cooling water inlet main pipe, and the other end being connected to the first inlet port of the first ion flow sensor, one end of the first outlet pipe being connected to the first outlet port of the first ion flow sensor, and the other end being connected to the fixed cooling water tank; a second detection component, the second detection component comprising a second inlet pipe, a second outlet pipe, and a second ion flow sensor, one end of the second inlet pipe being connected to the fixed cooling water outlet main pipe, and the other end being connected to the first inlet of the second ion flow sensor, one end of the second outlet pipe being connected to the first outlet of the second ion flow sensor, and the other end being connected to the fixed cooling water tank; Part of the liquid in the fixed cooling water inlet main pipe enters the excitation end, and the other part enters the first inlet pipe, flows through the first ion flow sensor, and then flows back to the fixed cooling water tank through the first outlet pipe; Part of the liquid in the cooling water outlet main pipe enters the cooling water tank, and the other part enters the second inlet pipe, flows through the second ion flow sensor, and then flows back to the cooling water tank through the second outlet pipe.

2. The generator cooling water dissolved hydrogen online monitoring system according to claim 1 is characterized in that: The generator constant cooling water dissolved hydrogen online monitoring system further includes a circulating cooling mechanism, which includes a circulating chiller, a first heat exchanger and a second heat exchanger. The first heat exchanger is sleeved on the outside of the first inlet pipe and is connected to the circulating chiller. The liquid in the circulating chiller can flow back to the circulating chiller after passing through the first heat exchanger. The second heat exchanger is sleeved on the outside of the second inlet pipe and is connected to the circulating chiller. The liquid in the circulating chiller can flow back to the circulating chiller after passing through the second heat exchanger.

3. The online monitoring system for dissolved hydrogen in generator cooling water according to claim 2 is characterized in that: The first detection component further includes a first valve, a second valve, a third valve, and a first flow meter, wherein the first valve is arranged on the first inlet pipe between the constant cold water inlet main pipe and the first heat exchanger, the second valve and the first flow meter are arranged in sequence on the first inlet pipe between the first heat exchanger and the first ion flow sensor, and the third valve is arranged on the first outlet pipe; The second detection component further includes a fourth valve, a fifth valve, a sixth valve and a second flow meter. The fourth valve is arranged on the second inlet pipe between the constant cold water outlet main pipe and the second heat exchanger. The fifth valve and the second flow meter are arranged in sequence on the second inlet pipe between the second heat exchanger and the second ion flow sensor. The sixth valve is arranged on the second outlet pipe.

4. The generator cooling water dissolved hydrogen online monitoring system according to claim 3 is characterized in that: The generator constant cooling water dissolved hydrogen online monitoring system further includes a calibration system, which includes a liquid containing cup and a metering pump, one end of the metering pump is connected to the liquid containing cup, and the other end is respectively connected to the first inlet of the first ion flow sensor and the first inlet of the second ion flow sensor; the liquid containing cup is also connected to the first outlet and the first outlet, and the metering pump can drive the liquid in the liquid containing cup to enter the first ion flow sensor from the first inlet and then flow back to the liquid containing cup through the first outlet, and drive the liquid in the liquid containing cup to enter the second ion flow sensor from the first inlet and then flow back to the liquid containing cup through the first outlet.

5. The generator cooling water dissolved hydrogen online monitoring system according to claim 4 is characterized in that: The calibration system further includes a first calibration tube, a second calibration tube, a third calibration tube, a first return tube, a second return tube, and a third return tube; One end of the first calibration tube is connected to the liquid-containing cup, one end of the second calibration tube is connected to the fixed cold water inlet main pipe, and the other end is connected to the end of the first calibration tube away from the liquid-containing cup, and one end of the third calibration tube is connected to the fixed cold water outlet main pipe, and the other end is connected to the end of the first calibration tube away from the liquid-containing cup; One end of the first reflux pipe is in communication with the liquid-containing cup, one end of the second reflux pipe is in communication with the first exit, and the other end is in communication with the end of the first reflux pipe away from the liquid-containing cup, and one end of the third reflux pipe is in communication with the first outlet, and the other end is in communication with the end of the first reflux pipe away from the liquid-containing cup; The metering pump is arranged on the first calibration tube.

6. The online monitoring system for dissolved hydrogen in generator cooling water according to claim 5 is characterized in that: The calibration system further includes a standard material gas cylinder and a third flow meter. The standard material gas cylinder is connected to the liquid containing cup. The third flow meter is arranged on the connecting pipe between the standard material gas cylinder and the liquid containing cup.

7. The online monitoring system for dissolved hydrogen in generator cooling water according to claim 5 is characterized in that: The first ion flow sensor further includes a second exit port, the first entrance port is located on one side of the first ion flow sensor, the first exit port is located at the top of the first ion flow sensor, and the second exit port is located at the bottom of the first ion flow sensor; The second ion current sensor further includes a second outlet, the first inlet is located on one side of the second ion current sensor, the first outlet is located at the top of the second ion current sensor, and the second outlet is located at the bottom of the second ion current sensor; The second exit and the second outlet are respectively connected to the liquid containing cup. When the first exit is connected to the outside air, the liquid in the detection cavity of the first ion flow sensor can flow back to the liquid containing cup through the second exit; when the second outlet is connected to the outside air, the liquid in the detection cavity of the second ion flow sensor can flow back to the liquid containing cup through the second outlet.

8. The online monitoring system for dissolved hydrogen in generator cooling water according to claim 7 is characterized in that: The calibration system further includes a first connecting pipe and a second connecting pipe; The calibration system further includes a first air valve and a second air valve; one end of the first connecting pipe is connected to the first exit, and the other end is provided with the first air valve; when the first air valve is opened, the first connecting pipe is connected to the outside world; when the first air valve is closed, the first connecting pipe is isolated from the outside world; One end of the second connecting pipe is connected to the first outlet, and the other end is provided with a second air valve; when the second air valve is opened, the second connecting pipe is connected to the outside; when the second air valve is closed, the second connecting pipe is isolated from the outside; One end of the first inlet pipe away from the constant cold water inlet main pipe is connected to the first connecting pipe; One end of the second inlet pipe away from the constant cold water outlet main pipe is connected to the second connecting pipe; One end of the second return pipe away from the first return pipe is connected to the first connecting pipe; One end of the third return pipe away from the first return pipe is communicated with the second communicating pipe.

9. The generator cooling water dissolved hydrogen online monitoring system according to claim 7, characterized in that: The calibration system further includes a fourth reflux pipe, a fifth reflux pipe and a sixth reflux pipe; one end of the fourth reflux pipe is connected to the liquid-containing cup; one end of the fifth reflux pipe is connected to the second exit, and the other end is connected to the end of the fourth reflux pipe away from the liquid-containing cup; one end of the sixth reflux pipe is connected to the second outlet, and the other end is connected to the end of the fourth reflux pipe away from the liquid-containing cup.

10. The online monitoring system for dissolved hydrogen in generator cooling water according to claim 9, characterized in that: The fixed cooling water inlet main pipe is provided with a fourth flow meter, and the fixed cooling water outlet main pipe is provided with a fifth flow meter.

11. An online monitoring method for dissolved hydrogen in cooling water of a generator based on the online monitoring system for dissolved hydrogen in cooling water of a generator according to any one of claims 1 to 10, characterized in that: include: guiding part of the liquid in the fixed cooling water inlet main pipe into the first ion flow sensor through the first inlet pipe and the first inlet port of the first ion flow sensor, and returning to the fixed cooling water tank through the first outlet port of the first ion flow sensor and the first outlet pipe; Part of the liquid in the cooling water outlet main pipe is guided into the second ion flow sensor through the second inlet pipe and the first inlet of the second ion flow sensor, and flows back to the cooling water tank through the first outlet and the second outlet pipe of the second ion flow sensor.

12. The method for online monitoring of dissolved hydrogen in constant cooling water according to claim 11, characterized in that: Stop guiding part of the liquid in the fixed cooling water inlet main pipe to flow to the first ion current sensor, and the liquid in the first ion current sensor to flow back to the fixed cooling water tank; guiding part of the liquid in the liquid-containing cup to enter the first ion current sensor through the first calibration tube, the second calibration tube, and the first inlet, and to flow back to the liquid-containing cup through the first outlet, the second return tube, and the first return tube; Stop guiding the liquid in the fixed cooling water outlet main pipe to flow to the second ion flow sensor, and stop guiding the liquid in the second ion flow sensor to flow back to the fixed cooling water tank; Part of the liquid in the liquid containing cup is guided into the second ion flow sensor through the first calibration tube, the third calibration tube and the first inlet, and flows back to the liquid containing cup through the first outlet, the third return tube and the first return tube.

13. The method for online monitoring of dissolved hydrogen in constant cooling water according to claim 12, characterized in that: The first ion flow sensor further includes a second exit port, the first entrance port is located on one side of the first ion flow sensor, the first exit port is located at the top of the first ion flow sensor, and the second exit port is located at the bottom of the first ion flow sensor; The second ion current sensor further includes a second outlet, the first inlet is located on one side of the second ion current sensor, the first outlet is located at the top of the second ion current sensor, and the second outlet is located at the bottom of the second ion current sensor; Stop guiding the liquid in the liquid containing cup to flow toward the first ion current sensor, and stop guiding the liquid in the first ion current sensor to flow back to the liquid containing cup; guiding external air into the first ion flow sensor through the first exit port while guiding the liquid in the first ion flow sensor to flow back to the liquid containing cup through the second exit port, the fifth return pipe, and the fourth return pipe; Stop guiding the liquid in the liquid containing cup to flow toward the second ion current sensor, and stop guiding the liquid in the second ion current sensor to flow back to the liquid containing cup; External air is guided to enter the second ion flow sensor through the first outlet, while liquid in the second ion flow sensor is guided to flow back to the liquid containing cup through the second outlet, the sixth return pipe, and the fourth return pipe.

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