Device for detecting hydrogen in water

Abstract

The utility model discloses an in-water hydrogen detection device which comprises an in-water dissolved hydrogen detection unit and a data processing unit, the data processing unit is connected with the in-water dissolved hydrogen detection unit, the in-water dissolved hydrogen detection unit comprises a flow regulator and a liquid collecting tank, one end of the flow regulator is communicated with a constant cold water tank through a sample feeding pipe, and the other end of the flow regulator is communicated with a constant cold water tank. The other end of the detection branch is divided into two parts through a sample injection pipe and is respectively communicated with a detection branch I and a detection branch II, and the tail ends of the detection branch I and the detection branch II are communicated into the liquid collection tank; the detection device disclosed by the utility model adopts double quantitative tubes and two paths of sample injection detection, and one path has a degassing function, so that dissolved hydrogen in water can be removed, the content of the dissolved hydrogen in the water is reduced, and the background of the dissolved hydrogen in the water is accurately detected; the other path is used for directly detecting the content of the dissolved hydrogen in the water, the content of the dissolved hydrogen in the water is obtained by calculating and deducting a background, the influence caused by different water qualities is eliminated, and the detection accuracy and reliability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen detection and analysis in water, and in particular to a hydrogen detection device in water. Background Art

[0002] The cooling methods of steam turbine generators mainly include water cooling, full hydrogen cooling, water hydrogen cooling and air cooling. Large thermal power generators mostly use the "water-hydrogen-hydrogen" cooling method, that is, the generator stator winding uses water as the cooling medium, and the stator core and rotor winding use hydrogen as the cooling medium. During operation, the hydrogen pressure in the generator chamber is higher than the stator cooling water pressure. The leakage of stator cooling water during the operation of water-hydrogen-hydrogen-cooled steam turbine generators is one of the main causes of stator winding failures, which often leads to the occurrence of generator grounding and phase-to-phase short circuit faults.

[0003] In addition to strengthening the monitoring of cooling water, hydrogen parameters and oil-water detectors when the generator is running, most units are equipped with a hydrogen concentration monitor on the upper part of the cooling water tank based on the characteristic that the hydrogen pressure in the generator chamber is higher than the water pressure, and hydrogen enters the wire rod cooling water through the leakage point and flows back to the cooling water tank. A gas flow meter is installed on the exhaust circuit of the cooling water tank to count the gas flow including hydrogen, or the dissolved hydrogen content in the cooling water is tested by instruments to monitor leakage in the cooling water circuit.

[0004] However, there are shortcomings in actual operation. For example, the method of detecting the dissolved hydrogen content in the cooling water by the detection instrument has the following problems: first, the detection instrument needs to be calibrated before it can be used, but the water used for calibration is relatively pure, which is significantly different from the water quality in the cooling water tank, which often makes the test results higher; second, the cooling water quality of different units is different, and the same detection instrument detects the cooling water of different units, and the test results are sometimes high and sometimes low; third, the cooling water quality of the same unit is also different at different times, which makes it difficult to judge the trend of the dissolved hydrogen content in the water through historical data. Due to the above reasons, the single detection of dissolved hydrogen content in water has obvious deficiencies in guiding actual production work. "Technical Regulations for Hydrogen Leakage Detection of Generator Stator Cooling Water" T / CEC 279-2019 clearly states that when the dissolved hydrogen content at the outlet of the generator stator cooling water pump is greater than 60μg / L, the stator cooling water system is at risk of hydrogen leakage. In summary, how to improve the accuracy and reliability of the detection of dissolved hydrogen content in water is an urgent problem to be solved. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to improve the accuracy and reliability of detecting the content of dissolved hydrogen in water.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A water hydrogen detection device comprises a water dissolved hydrogen detection unit and a data processing unit, wherein the data processing unit is connected to the water dissolved hydrogen detection unit, and the water dissolved hydrogen detection unit comprises a flow regulator and a liquid collecting tank, wherein one end of the flow regulator is connected to a fixed cooling water tank through an injection tube, and the other end is divided into two by the injection tube and respectively connected to a detection branch 1 and a detection branch 2, and the ends of the detection branch 1 and the detection branch 2 are both connected to the liquid collecting tank;

[0008] The detection branch 1 comprises a quantitative tube 1, an electromagnetic switching valve 1 and a detector 1 which are connected in sequence through an injection tube;

[0009] The second detection branch comprises a second quantitative tube, a degassing device, a second electromagnetic switching valve and a second detector which are connected in sequence through a sample injection tube.

[0010] The detection device of the present application adopts dual quantitative tubes and two-way sampling detection. One way has a degassing function, which can remove dissolved hydrogen in water, reduce the dissolved hydrogen content in water, and accurately detect the dissolved hydrogen background in water; the other way directly detects the dissolved hydrogen content in water, and obtains the dissolved hydrogen content in water by calculating and deducting the background, eliminating the influence of different water qualities and improving the accuracy and reliability of detection. The dual quantitative tubes, dual detectors, and multi-process detection methods are used to detect the dissolved hydrogen content in cold water, aiming to improve the accuracy and reliability of the detection of dissolved hydrogen content in water.

[0011] As a further solution of the utility model: the electromagnetic switching valve 1 and the electromagnetic switching valve 2 are connected through a liquid inlet pipe.

[0012] As a further solution of the utility model: a stop valve is provided in the sample inlet pipe between the constant cooling water tank and the flow regulator.

[0013] As a further solution of the utility model: a fixed cooling water tank sampling valve is also provided between the fixed cooling water tank and the stop valve.

[0014] As a further solution of the utility model: the inner diameter of the sample injection tube is 3 mm, and the material is polytetrafluoroethylene.

[0015] As a further solution of the utility model: the flow regulator controls the injection flow rate in the range of 0ml / min to 500ml / min.

[0016] As a further solution of the utility model: the capacity of the quantitative tube 1 and the quantitative tube 2 is 10.0 ml, and the material is coated stainless steel.

[0017] As a further solution of the utility model: the detector 1 and the detector 2 are connected to a data processor.

[0018] As a further solution of the utility model: the data processing unit package includes a computer control system and a touch screen, the computer control system is electrically connected to the data processor, detector 1, detector 2, electromagnetic switching valve 1, electromagnetic switching valve 2 and degassing device respectively, and the computer control system is electrically connected to the touch screen.

[0019] As a further solution of the utility model: the detector 1 and the detector 2 are electrochemical sensors.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. The detection device of the present application adopts dual quantitative tubes and two-way sample injection detection. One way has a degassing function, which can remove dissolved hydrogen in water, reduce the dissolved hydrogen content in water, and accurately detect the dissolved hydrogen background in water; the other way directly detects the dissolved hydrogen content in water, and obtains the dissolved hydrogen content in water by calculating and deducting the background, eliminating the influence of different water quality, and improving the accuracy and reliability of detection. The dual quantitative tubes, dual detectors, and multi-process detection methods are used to detect the dissolved hydrogen content in cold water, aiming to improve the accuracy and reliability of dissolved hydrogen content detection in water;

[0022] 2. The degassing device designed in this application can degas the sample water to make the dissolved hydrogen content in the water less than 0.1μg / L. The background detection and dissolved hydrogen detection of the same water sample can eliminate the interference of water quality, so that the detection data of cooling water of different units and cooling water of the same unit at different times are comparable;

[0023] 3. The detection device provided in the present application uses dual detectors and two-way sampling to detect the dissolved hydrogen content in water, and has a detector switching function. It can detect the dissolved hydrogen content in water twice by switching the detector, and take the average value as the final detection result, thereby eliminating the influence of detector drift and improving the detection accuracy and reliability;

[0024] 4. The detection device provided in this application adopts a multi-process detection method, which is more suitable for the monitoring needs of cold water quality;

[0025] In process one, a single quantitative tube and a single detector are used to detect dissolved hydrogen in water, which is suitable for the detection of cooling water quality in the same unit and under the same working conditions;

[0026] In process 2, a single quantitative tube and dual detectors are used to detect dissolved hydrogen in water. By switching the detectors, two test results for the same water sample are obtained, which can accurately determine the drift of the detector and realize self-testing of the detection instrument.

[0027] Among them, process three uses dual quantitative tubes and dual detectors to detect dissolved hydrogen in water, obtains water quality background data through degassing, and eliminates water quality influences. It is suitable for cooling water quality detection of different units or different operating conditions of the same unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a pipeline flow diagram of a water hydrogen detection device according to an embodiment of the utility model;

[0029] Figure 2 This is a structural block diagram of a device for detecting hydrogen in water according to an embodiment of the utility model;

[0030] Explanation of the reference numerals: 1. Cooling water tank; 2. Sampling valve for cooling water tank; 3. Stop valve; 4. Flow regulator; 51. Quantitative tube 1; 52. Quantitative tube 2; 6. Degassing device; 7. Liquid collecting tank; 81. Solenoid switching valve 1; 82. Solenoid switching valve 2; 91. Detector 1; 92. Detector 2; 10. Data processor; 11. Computer control system; 12. Touch screen. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1 A water hydrogen detection device includes a fixed cooling water tank 1, a flow regulator 4, a quantitative tube 1 51, a quantitative tube 2 52, a degassing device 6, a liquid collecting tank 7, an electromagnetic switching valve 1 81, an electromagnetic switching valve 2 82, a detector 1 91 and a detector 2 92, wherein one end of the flow regulator 4 is connected to the fixed cooling water tank 1 through a sampling tube, and the other end is divided into two by the sampling tube 1 and connected to the detection branch 1 and the detection branch 2 respectively, and the ends of the detection branch 1 and the detection branch 2 are both connected to the liquid collecting tank 7;

[0033] The detection branch 1 includes a quantitative tube 51, an electromagnetic switching valve 81 and a detector 91 which are connected in sequence through a sampling tube, wherein one end of the quantitative tube 51 is connected to the flow regulator 4 through the sampling tube, and the other end of the quantitative tube 51 is connected to the electromagnetic switching valve 81 through the sampling tube, and the electromagnetic switching valve 81 is connected to the detector 91 through the sampling tube, and the detector 91 is connected to the liquid collecting tank 7 through the sampling tube;

[0034] The detection branch two includes a quantitative tube 2 52, a degassing device 6, an electromagnetic switching valve 2 82 and a detector 2 92 which are connected in sequence through an injection tube, wherein one end of the quantitative tube 2 52 is connected to the flow regulator 4 through the injection tube, the other end of the quantitative tube 2 52 is connected to the degassing device 6 through the injection tube, the degassing device 6 is connected to the electromagnetic switching valve 2 82 through the injection tube, and the electromagnetic switching valve 2 82 is connected to the detector 2 92 through the injection tube, and the detector 2 92 is connected to the liquid collecting tank 7 through the injection tube.

[0035] Furthermore, the electromagnetic switching valve 1 81 and the electromagnetic switching valve 2 82 are connected by a liquid inlet pipe, so that the original two detection branches can be divided into four detection branches, namely, detection branch 3 and detection branch 4. Specifically:

[0036] The detection branch 1 is: flow regulator 4 - quantitative tube 51 - electromagnetic switching valve 81 - detector 91 - liquid collecting tank 7; this branch has a single quantitative tube and a single detector to detect dissolved hydrogen in water, which is suitable for the constant cooling water quality detection of the same unit and the same working condition;

[0037] The second detection branch is: flow regulator 4 - quantitative tube 2 52 - degassing device 6 - electromagnetic switching valve 2 82 - detector 2 92 - liquid collecting tank 7; this branch has a single quantitative tube and a single detector to detect dissolved hydrogen in water, which is suitable for the same unit and the same working condition of the constant cooling water quality detection;

[0038] The detection branch three is: flow regulator 4 - quantitative tube 1 51 - electromagnetic switching valve 1 81 - electromagnetic switching valve 2 82 - detector 1 91 and (or) detector 2 92 - liquid collecting tank 7; this branch has a single quantitative tube and dual detectors to detect dissolved hydrogen in water. By switching the detectors, two detection results of the same water sample can be obtained, which can accurately judge the drift of the detector and realize the self-test of the detection instrument;

[0039] Detection branch four is: flow regulator 4 - quantitative tube 2 52 - degassing device 6 - electromagnetic switching valve 2 82 - electromagnetic switching valve 1 81 - detector 1 91 and (or) detector 2 92 - liquid collecting tank 7: This branch double detector detects dissolved hydrogen in water, obtains water quality background data through degassing, eliminates water quality influence, and is suitable for cooling water quality detection of different units or different working conditions of the same unit.

[0040] It should be noted that the inner diameter of the sample injection tube is 3 mm (φ3) and the material is polytetrafluoroethylene. It is used as a connecting pipeline between the constant cooling water tank 1, the flow regulating valve 4, the quantitative tube, the electromagnetic switching valve, the detector, and the liquid collecting tank 7.

[0041] Reference Figure 1A stop valve 3 is provided in the sampling pipe between the fixed cooling water tank 1 and the flow regulator 4, and a fixed cooling water tank sampling valve 2 is also provided between the fixed cooling water tank 1 and the stop valve 3.

[0042] Reference Figure 1 The flow regulator 4 controls the injection flow rate in the range of 0ml / min to 500ml / min. During detection, the injection flow rate is preferably controlled at (200±10)ml / min.

[0043] Reference Figure 1 The capacity of quantitative tube 1 51 and quantitative tube 2 52 is 10.0 ml. The two quantitative tubes 5 are quantitative tubes of the same specification and model, and are made of coated stainless steel, which has a passivation effect on water and hydrogen, and has no reaction and adsorption effect.

[0044] Reference Figure 1 The degassing device 6 can remove dissolved hydrogen in water, making the dissolved hydrogen content in water less than 0.1μg / L. It should be noted that there are five types of degassing devices in water: air blast degassing, vacuum degassing, membrane degassing, catalytic degassing and thermal degassing. Because the solubility of hydrogen in water is small, this patent adopts a vacuum degasser to achieve the degassing effect.

[0045] Reference Figure 1 , the liquid collecting tank 7 has a capacity of 2L and can be disassembled to dump the water sample inside.

[0046] Reference Figure 1 The electromagnetic switching valve 1 81 and the electromagnetic switching valve 2 82 can realize the switching of the water sample from the flushing pipeline to the detector pipeline.

[0047] Reference Figure 1 The detection range of detector 1 91 and detector 2 92 is 0 μg / L to 1000 μg / L, and the detection sensitivity is 0.1 μg / L. The two detectors are electrochemical sensors of the same specification and model.

[0048] Reference Figure 1 and Figure 2 , the data processor 10 is connected to the detector 1 91 and the detector 2 92 .

[0049] Reference Figure 1 and Figure 2The computer control system 11 can realize precise control of the electromagnetic switching valve 8 and process the detection data of the dual detectors, i.e., the detector 1 91 and the detector 2 92. The computer control system 11 is electrically connected to the data processor 10, the detector 1 91, the detector 2 92, the electromagnetic switching valve 1 81, the electromagnetic switching valve 2 82 and the degassing device 6 respectively. The computer control system 11 is also electrically connected to the touch screen 12. The computer control system 11 can switch the detectors for the background detection of the sampled water and the direct detection of the dissolved hydrogen content in the water, thereby realizing the self-calibration function of the detector, which is conducive to ensuring the accuracy and reliability of the detection results.

[0050] Reference Figure 1 and Figure 2 The touch screen 12 can realize the functions of switching the detector 9, saving and querying data, etc.

[0051] The present application can simultaneously perform background detection on the degassed water sample and directly detect the dissolved hydrogen content in the water, and calculate the dissolved hydrogen content in the water sample according to the difference in the detection results of the dual detectors 9 (i.e., detector one 91 and detector two 92), eliminating the influence of different water quality on the detection results. Make the detection results more accurate and reliable. The measurement range is 0μg / L~1000μg / L, which fully meets the detection requirements of dissolved hydrogen content in the cooling water of the generator of the thermal power plant.

[0052] The specific operating principles of this application are as follows:

[0053] 1. First, do the preparation work.

[0054] (1) Preparation of cooling water tank

[0055] Before measurement, turn off the cooling water pump and open the upper exhaust valve of cooling water tank 1 for more than 1 hour.

[0056] (2) Connecting pipes

[0057] Connect the sampling port of the testing instrument to the sampling port of the cooling water tank 1 through a seal. Open the sampling valve 2 and the stop valve 3 of the cooling water tank, and adjust the water inlet flow rate through the flow regulator 4 to stabilize the flow rate at 200ml / min for testing.

[0058] (3) Setting up the testing process

[0059] Set up the testing process three;

[0060] The detection device adopts a multi-process detection method. Process 1, a single quantitative tube 5, a single detector, is suitable for the detection of cooling water quality in the same unit and the same working condition. Process 2, a single quantitative tube 5, a dual detector, by switching the detector, two test results of the same water sample are obtained, which can accurately judge the drift of the detector and realize the self-inspection of the detection instrument. Process 3, a dual quantitative tube 5, a dual detector detects the dissolved hydrogen in the water, obtains the water quality background data by degassing, eliminates the influence of water quality, and is suitable for the detection of cooling water quality in different units or different working conditions of the same unit.

[0061] 2. Detection of dissolved hydrogen content in water.

[0062] (1) Flushing of quantitative tube

[0063] Through the control of the electromagnetic switching valve 1 81 and the electromagnetic switching valve 2 82, the water sample passes through the quantitative tube 5 and enters the liquid collecting tank 7, completing the flushing of the quantitative tube 6. During the flushing process, the degassing device 6 is not started.

[0064] (2) Detection of dissolved hydrogen content in water

[0065] Through the control of electromagnetic switching valve 1 81 and electromagnetic switching valve 2 82, the water sample passes through the quantitative tube 5 and enters the corresponding detector to complete the detection of dissolved hydrogen content in the water. After the detection, the water sample enters the liquid collecting tank 7. At this time, the degassing device 6 is started to obtain the background data of the water sample after degassing.

[0066] (3) Data processing

[0067] The test result of dissolved hydrogen content in water sample is the difference between the test results of two detectors. The average value is taken as the final test result of dissolved hydrogen content in cold water.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting hydrogen in water, characterized in that: It comprises a water dissolved hydrogen detection unit and a data processing unit, wherein the data processing unit is connected to the water dissolved hydrogen detection unit, and the water dissolved hydrogen detection unit comprises a flow regulator (4) and a liquid collecting tank (7), wherein one end of the flow regulator (4) is connected to the fixed cooling water tank (1) through a sampling tube, and the other end is divided into two through the sampling tube and respectively connected to a detection branch one and a detection branch two, and the ends of the detection branch one and the detection branch two are both connected to the liquid collecting tank (7); The detection branch one comprises a quantitative tube one (51), an electromagnetic switching valve one (81) and a detector one (91) which are connected in sequence through an injection tube; The second detection branch comprises a second quantitative tube (52), a degassing device (6), a second electromagnetic switching valve (82) and a second detector (92) which are sequentially connected through a sample injection tube.

2. A water hydrogen detection device according to claim 1, characterized in that: The electromagnetic switching valve 1 (81) and the electromagnetic switching valve 2 (82) are connected via a liquid inlet pipe.

3. A device for detecting hydrogen in water according to claim 1, characterized in that: A stop valve (3) is provided in the sample inlet pipe between the constant cooling water tank (1) and the flow regulator (4).

4. A device for detecting hydrogen in water according to claim 3, characterized in that: A cooling water tank sampling valve (2) is also provided between the cooling water tank (1) and the stop valve (3).

5. A water hydrogen detection device according to claim 1, characterized in that: The inner diameter of the injection tube is 3 mm and the material is polytetrafluoroethylene.

6. A device for detecting hydrogen in water according to claim 1, characterized in that: The flow regulator (4) controls the injection flow rate to be in the range of 0 ml / min to 500 ml / min.

7. A water hydrogen detection device according to claim 1, characterized in that: The capacity of the quantitative tube 1 (51) and the quantitative tube 2 (52) is 10.0 ml, and the material is coated stainless steel.

8. A device for detecting hydrogen in water according to claim 1, characterized in that: The detector 1 (91) and the detector 2 (92) are connected to a data processor (10).

9. A device for detecting hydrogen in water according to claim 8, characterized in that: The data processing unit package includes a computer control system (11) and a touch screen (12). The computer control system (11) is electrically connected to the data processor (10), detector 1 (91), detector 2 (92), electromagnetic switching valve 1 (81), electromagnetic switching valve 2 (82) and degassing device (6), respectively. The computer control system (11) is also electrically connected to the touch screen (12).

10. The device for detecting hydrogen in water according to claim 1, characterized in that: The detector 1 (91) and the detector 2 (92) are electrochemical sensors.

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