A method and apparatus for verifying a flow measurement system

Abstract

This invention discloses a verification method and apparatus for a flow measurement system. The verification method includes the following steps: a flow-transfer system delivers water to the flow measurement system according to a preset water delivery value; real-time measurement values ​​of the flow meters in the flow measurement system are obtained; the preset water delivery value is compared with the real-time measurement values ​​to obtain a comparison verification result. The technical solution of this invention allows the flow-transfer system to directly deliver water to the flow measurement system, enabling the rapid establishment of a stable water delivery flow rate to verify the flow measurement system during the verification process, thus shortening the verification cycle.

Description

Technical Field

[0001] This invention relates to the field of flow measurement, and more particularly to a verification method and apparatus for a flow measurement system. Background Technology

[0002] Nuclear power plants have unique design features in their nuclear island building layout. By dividing the building into different compartments, effective physical isolation is achieved between different equipment. This not only protects the equipment but also improves the availability of the power plant under fault conditions and increases unit utilization. When a leak occurs during operation, the leaked material diffuses into the various buildings as water vapor, increasing humidity and generating wet steam. The containment cooling and ventilation system within the building uses internal circulation to transport the wet steam to the cooling pipes. The condensate on the cooling pipes is collected in a condensate tray below the cooling pipes and then drained into floor drains through the drainage system. To monitor the amount of leaked material, the collected condensate needs to be monitored.

[0003] The technologies used for monitoring condensate in nuclear power plants mainly include indirect radiation monitoring, acoustic monitoring, humidity-sensitive element monitoring, temperature monitoring, flow monitoring, porous media humidity sampling monitoring, deuterium concentration monitoring, laser sensor monitoring, and fuzzy safety monitoring. In the primary loop of a nuclear power plant, the method for monitoring leaked materials is a flow monitoring system designed based on Coriolis force. After the leaked material turns into condensate, it enters a collection pan and then the flow measurement system. Due to the complex on-site construction environment, the flow meters and pipelines in the flow measurement system need to be validated before the flow monitoring system can be applied. Currently, in existing technologies, the water flow needs to pass through the containment cooling ventilation system to enter the flow measurement system. During the validation process, a stable flow rate cannot be quickly established, resulting in a longer validation cycle. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a verification method and apparatus for a flow measurement system.

[0005] The technical solution adopted by this invention to solve its technical problem is: to provide a verification method for a flow measurement system, comprising the following steps:

[0006] S1: The flow-rate water delivery system delivers water to the flow measurement system according to the preset water delivery value;

[0007] S2: Obtain the real-time measurement value of the flow meter in the flow measurement system;

[0008] S3: Compare the preset water delivery value with the real-time measurement value to obtain the comparison verification result.

[0009] Preferably, the verification method further includes step S4, which determines whether the flow measurement system meets the design requirements based on the comparison verification results.

[0010] Preferably, step S4 includes:

[0011] S4-1: When the comparison verification result shows that the real-time measurement value jumps, it is determined that there is a vacuum in the water supply pipeline at the back end of the flow meter, and a high-level vent is added at the bend near the water outlet of the flow meter.

[0012] S4-2: When the comparison verification result is 0 for the real-time measurement value, it is determined that the low flow cut-off function of the flow meter is not turned off and / or the pipeline slope is insufficient. The low flow cut-off function of the flow meter is turned off and / or the pipeline slope is adjusted.

[0013] S4-3: When the comparison verification result shows that the preset water delivery value and the real-time measurement value do not meet the error requirements, it is determined that the pipeline slope is insufficient, and the pipeline slope is adjusted.

[0014] Preferably, the verification method further includes step S4, which determines whether the flow measurement range in the flow measurement system meets the requirements based on the comparison verification results.

[0015] Preferably, step S4 includes: gradually adjusting the preset water supply value; when the comparison verification result shows that the real-time measurement value in the flow meter does not change with the increase of the preset water supply value when the preset water supply value is adjusted, it is determined that the flow meter range is unreasonable.

[0016] Preferably, the verification method further includes step S4, which determines whether the flow meter in the flow measurement system meets the setting requirements based on the comparison verification results.

[0017] Preferably, step S4 includes: adjusting the preset water delivery value to the second highest alarm threshold of the flow meter; when the comparison verification result is that the water collection tray overflows, it is determined that the second highest alarm threshold of the flow meter is set unreasonably.

[0018] The present invention also provides a verification device for a flow measurement system, which applies any of the verification methods described above. The verification device includes a water pump with adjustable water flow rate, a flow meter displaying the water flow rate, and several connecting pipes. The inlet of the water pump is connected to a water source through the connecting pipes, and the outlet of the water pump is connected to the inlet of the flow meter through the connecting pipes. The outlet of the flow meter is connected to the inlet of the flow measurement system through the connecting pipes.

[0019] Preferably, the accuracy of the flow meter is higher than 2.5%.

[0020] Preferably, the water pump is an adjustable metering pump.

[0021] The technical solution of the present invention has the following beneficial effects: the flow water conveyance system directly conveys water to the flow measurement system, and during the verification process, a stable water conveyance flow can be quickly established to verify the flow measurement system, thus shortening the verification cycle. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the verification process according to an embodiment of the present invention;

[0024] Figure 2 This is a structural diagram of the flow measurement system according to an embodiment of the present invention;

[0025] Figure 3 This is a structural diagram of the flow measurement verification device according to an embodiment of the present invention. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] In a preferred embodiment, reference Figure 1 ,and Figure 2 The verification method of this embodiment is applied to verify the flow measurement system for leaked condensate in a nuclear power plant. The leaked material from the nuclear power plant is in the form of water vapor. After leaking, it condenses in the cooling coil 15 through the ventilation system, forming condensate. The condensate enters the collection pan 13 and then flows into the flow measurement system. While verifying the flow meter 14 in the flow measurement system, the pipelines within the system also need to be verified. In the flow measurement system, a Coriolis condensate flow measurement device is installed on each measurement pipeline. Specifically, the verification method includes the following steps:

[0028] S1: The flow-rate water delivery system delivers water to the flow measurement system according to a preset delivery value. Specifically, this verification method uses an external flow-rate water delivery system, which delivers water to the flow measurement system according to a preset delivery value. During the water delivery process, the flow-rate water delivery system gradually adjusts its delivery volume to ensure that the water delivery gradually increases to the preset load value of the flow measurement system. Of course, the preset delivery value and the verification results are also related.

[0029] S2: Obtain the real-time measurement value of flow meter 14 in the flow measurement system. Specifically, flow meter 14 is installed in the flow measurement system. When water flows through flow meter 14, the real-time measurement value is obtained through flow meter 14. The flow meter 14 is a Coriolis mass flow meter. During use, when the fluid in the pipe is not flowing, the driver causes the pipe to vibrate. The fluid in the pipe does not generate Coriolis force, and the force at the two measuring points in the pipe is equal and the rate of change is the same. At this time, the real-time measurement value on flow meter 14 is 0. When there is fluid flowing in the pipe, the fluid will generate additional force at the two measuring points, causing the speed and direction of movement at the two measuring points to change. It can be understood that the flow meter 14 in the flow measurement system can also be an electromagnetic flow meter, a turbine flow meter, or other types of flow meter.

[0030] S3: Compare the preset water delivery value with the real-time measurement value to obtain a comparison verification result. Specifically, the preset water delivery value in the flow water delivery system is known. After water is delivered to the flow measurement system according to the preset water delivery value, the flow meter 14 in the flow measurement system will read a real-time measurement value. A comparison verification result is obtained by comparing the preset water delivery value with the real-time measurement value. It can be understood that any result that can be deduced from the verification result can be used as a comparison verification result. This embodiment uses the preset water delivery value and the real-time measurement value as an example for comparison and explanation. Those skilled in the art can apply other deduced verification results to the inventive concept of this embodiment, which also falls within the protection scope of this embodiment. Among them, the preset water delivery value is obtained through the flow water delivery system, and the real-time measurement value is obtained through the flow meter 14 in the flow measurement system.

[0031] S4: Determine whether the flow measurement system meets the design requirements based on the comparison and verification results. Specifically, after obtaining the comparison and verification results, it is necessary to analyze them. By analyzing the comparison and verification results, determine whether the flow measurement system meets the design requirements. The flow measurement system can include low-flow measurement pipelines, medium-flow measurement pipelines, and high-flow measurement pipelines. Among them, the pipelines in low-flow measurement pipelines are shorter and have smaller vertical drops, making it easier to establish a stable flow rate. However, due to the complex on-site installation environment, the slope of the horizontal pipe section in low-flow pipelines is more likely to be unreasonable. At the same time, because the flow rate is small, the low-flow cutoff function of flowmeter 14 will also affect the measurement. Therefore, the verification of low-flow measurement pipelines mainly focuses on verifying the low-flow cutoff function of flowmeter 14. The verification of medium-flow measurement pipelines involves several steps: whether the pipeline slope design is reasonable, whether the maximum alarm threshold setting is reasonable, and whether the flowmeter 14's range is reasonable. For medium-flow measurement pipelines, there are numerous detours and bends above the flowmeter 14, resulting in significant local flow resistance during water transport. Additionally, there is a long vertical pipeline downstream of the flowmeter 14. Therefore, the verification of medium-flow measurement pipelines primarily focuses on whether there is a vacuum in the pipeline, whether there is any stagnation in the pipeline, whether the maximum alarm threshold setting is reasonable, and whether the flowmeter 14's range is reasonable. For large-flow measurement pipelines, the verification primarily focuses on whether the maximum alarm threshold setting is reasonable and whether the flowmeter 14's range is reasonable. When verifying small-flow measurement pipelines, first verify whether the small-flow cutoff function of the flowmeter 14 is turned off; then verify whether the pipeline slope design is reasonable; finally, verify whether the maximum alarm threshold setting is reasonable and whether the flowmeter 14's range is reasonable. When verifying a medium-flow measurement pipeline, first verify if there is a vacuum, then verify if there is any stagnation, and finally verify if the maximum alarm threshold setting (second step) is reasonable, as well as the flowmeter 14's measurement range. When verifying a high-flow measurement pipeline, first verify if the maximum alarm threshold setting (second step) is reasonable, then verify if the flowmeter 14's measurement range is reasonable. Of course, during the verification process, regardless of whether it's a small, medium, or high-flow measurement pipeline, the error between the real-time measurement value of the flowmeter 14 and the preset water delivery value should be within the accuracy requirements of the flow measurement system.

[0032] In a preferred embodiment, reference Figure 1 In this embodiment, the verification method yields different comparison results as the preset water supply value is continuously adjusted during the verification process. Specifically, it includes the following steps:

[0033] S4-1: When the comparison verification result shows a jump in the real-time measurement value, it is determined that there is a vacuum in the water supply pipeline behind the flow meter 14. A high-level vent hole is added at the bend near the outlet of the flow meter 14. Specifically, when the preset water supply value is adjusted to a medium flow rate, during the application of the flow measurement system, the real-time measurement value exhibits periodic rapid fluctuations between zero and the corresponding flow rate, and the real-time measurement value jumps appear on the display interface of the flow meter 14. At this time, after analysis, it is found that there is a long vertical downward section of the pipeline behind the flow meter 14, generally more than 10 meters. After the water flows through the flow meter 14, after the water flows into the vertical pipeline, a periodic vacuum appears in the pipeline behind the flow meter 14 due to gravity. Therefore, in order to solve the problem of periodic vacuum, a high-level vent hole is added at the bend near the outlet of the flow meter 14. The problem of periodic vacuum caused by gravity is eliminated through the high-level vent hole. If the real-time measurement value still jumps after adding the high-level vent hole, it is determined that the flow meter 14 is abnormal.

[0034] S4-2: When the comparison verification result shows a real-time measurement value of 0, it is determined that the low-flow cutoff function of flow meter 14 is not turned off and / or the pipeline slope is insufficient. The low-flow cutoff function of flow meter 14 is turned off and / or the pipeline slope is adjusted. Specifically, the preset water delivery value is adjusted to a low flow rate. When the comparison verification result shows a real-time measurement value of 0, it is determined that the cause of the 0 real-time measurement value is that the low-flow cutoff function of flow meter 14 is not turned off and / or the pipeline slope is insufficient. When the low-flow cutoff function of flow meter 14 is not turned off, if the water flowing into flow meter 14 is insufficient, flow meter 14 will automatically block the low flow rate and display 0. At this point, the low-flow cutoff function of flow meter 14 is turned off. Of course, if the pipeline slope is insufficient, water cannot flow into flow meter 14 due to the slope problem. Without water flowing into flow meter 14, the real-time measurement value of flow meter 14 is also 0. Understandably, when the real-time measurement value is 0, it may be that the low-flow cutoff function of flow meter 14 is not turned off, or it may be that the pipeline slope is insufficient. It may also be that the low-flow cutoff function of flow meter 14 is not turned off at the same time, and the pipeline slope is insufficient. After turning off the low-flow cutoff function of flow meter 14 and adjusting the pipeline slope, the real-time measurement value is still 0, which is judged as a malfunction of flow meter 14.

[0035] S4-3: When the comparison verification result shows that the preset water delivery value and the real-time measured value do not meet the error requirements, it is judged that the pipeline slope is insufficient, and the pipeline slope should be adjusted. Specifically, the difference between the preset water delivery value and the real-time measured value should be less than or equal to 2% of the preset water delivery value. When the difference between the real-time measured value of flowmeter 14 and the preset water delivery value is greater than 2% of the preset water delivery value, it is judged that the pipeline slope is insufficient, and stagnation occurs during the water flow to flowmeter 14. At this time, the pipeline slope needs to be adjusted. The pipeline slope can be adjusted multiple times, and the pipeline slope should be at least greater than 3%. If, after multiple adjustments, the error between the preset water delivery value and the real-time measured value is still greater than 2%, it is judged that flowmeter 14 is abnormal.

[0036] In a preferred embodiment, see Figure 1 This verification method can also verify whether the range and maximum alarm threshold of flow meter 14 are set reasonably. The verification of the range of flow meter 14 specifically includes the following: adjusting the preset water supply value to the design load value of the flow measurement system. During the adjustment process, the real-time measurement value of flow meter 14 will change relatively quickly at the beginning as the preset water supply value is adjusted. When the real-time measurement value on flow meter 14 no longer changes after the preset water supply value is further adjusted, it indicates that the design load value of the flow measurement system is greater than the range of flow meter 14 in the flow measurement system, and it is judged that the range of flow meter 14 is unreasonable.

[0037] In this embodiment, verifying the second maximum alarm threshold of the flow meter 14 specifically includes the following: adjusting the preset water supply value to the second maximum alarm threshold of the flow meter 14. The maximum alarm threshold varies depending on the pipeline in the flow measurement system. Each flow measurement system can be set with two alarm values: a first maximum alarm threshold and a second maximum alarm threshold. The maximum alarm thresholds are categorized by flow type: the first and second maximum alarm thresholds for high-flow-rate pipelines, the first and second maximum alarm thresholds for medium-flow-rate pipelines, and the first and second maximum alarm thresholds for low-flow-rate pipelines. Specifically, the first maximum alarm threshold for high-flow-rate pipelines is 18 kg / h. The highest alarm threshold 2 is 180 kg / h; for medium flow measurement pipelines, the highest alarm threshold 1 is 10 kg / h and the highest alarm threshold 2 is 130 kg / h; for low flow measurement pipelines, the highest alarm threshold 1 is 10 kg / h and the highest alarm threshold 2 is 25 kg / h. When verifying the highest alarm threshold, only the highest alarm threshold 2 needs to be verified. The preset water supply value is adjusted to the corresponding pipeline's highest alarm threshold 2. If the water collection pan 13 in the flow measurement system overflows, it is determined that the highest alarm threshold 2 setting of the flow meter 14 is unreasonable. If the water collection pan 13 in the flow measurement system does not overflow and reaches the highest alarm threshold 2, it can alarm normally, then the highest alarm threshold 2 setting of the flow meter 14 is reasonable. It is understandable that both the highest alarm threshold 1 and the highest alarm threshold 2 are adjustable. During use, the highest alarm threshold 1 and / or the highest alarm threshold 2 of the flow meter 14 can be adjusted larger or smaller according to the actual situation.

[0038] See Figure 3 The diagram shows a structural schematic of a verification device for a flow measurement system provided by the present invention. This device can be used to verify that the flow measurement system provides a preset water supply. It may include a water pump 10, a flow meter 12, and several connecting pipes 11. The water pump 10 is connected to a water source 16 to provide the preset water supply. The flow meter 12 is connected to the water pump 11. After the preset water supply flows through the flow meter 12, the preset water supply value can be read through the flow meter 12. At the same time, the preset water supply value can also be adjusted by the water pump 11. Understandably, one end of the flow meter 12 is connected to the water inlet of the flow measurement system. After the water flows through the flow meter 12, it flows into the flow measurement system.

[0039] In this embodiment, the water pump 10 is an adjustable metering pump. The adjustable metering pump has a reading dial, through which the preset water delivery value can be read. The adjustable metering pump adopts a hydraulic diaphragm plunger pump, and its main parameters are as follows: Principle: Diaphragm pump; Drive method: Electric; Impeller structure: Closed impeller; Rated flow rate: 0-280L / H; Adjustable flow range: 0-280L / H; Simulation accuracy: 2%; Interface pipe diameter: Inner diameter 15mm; Maximum outlet pressure: 0-0.8Mpa; Shaft power: 250-750 (W).

[0040] In this embodiment, the adjustable metering pump and the flow meter 12 are connected via a connecting pipe 11. The diameter of the connecting pipe 11 is the same as that of the interface pipe, with an inner diameter of 15mm. The connection method uses a flange connection, and the pressure resistance of the flange and the connecting pipe 11 is greater than 0.8MPa. The accuracy of the flow meter 12 is greater than 2.5%. The main parameters of the flow meter 12 are as follows: accuracy class: Class 2; nominal diameter: DN15; maximum allowable working pressure: 1.6MPa; minimum measured flow rate: 6L / h.

[0041] Furthermore, in some other embodiments, the connection method may be a threaded connection.

[0042] like Figure 3 As shown, when assembling the device, the adjustable metering pump can be placed in the designated position first, and then the flow meter 12 can be placed in the designated position. After placement, the adjustable metering pump and the flow meter 12 can be connected through the connecting pipe 11. Then, the water source 16 can be connected to the adjustable metering pump and the flow meter 12 can be connected to the flow measurement system through the connecting pipe 11.

[0043] During the verification process, after assembling the device and connecting it to the flow measurement system, the flow meter 12 is first powered on, and then the adjustable metering pump is started. The adjustable metering pump is adjusted to deliver water to the flow measurement system according to the preset water delivery value. The real-time measurement value of the flow meter 14 in the flow measurement system is obtained. The purpose of verifying the flow measurement system is achieved by comparing the preset water delivery value with the real-time measurement value. Specifically, after turning on the device, adjust the preset water delivery value of the adjustable metering pump according to the verification purpose. Determine whether the preset water delivery value meets the verification requirements by checking the scale value on the adjustable metering pump or the reading on the flow meter 12. When the verification purpose is to verify whether the low flow cut-off function of the flow meter 14 is turned off or whether the pipeline slope of the flow measurement system is sufficient, adjust the preset water delivery value of the adjustable metering pump to a low flow rate for verification. When the verification purpose is to verify whether there is a vacuum or stagnation in the pipeline downstream of the flow meter in the flow measurement system, adjust the preset water delivery value of the adjustable metering pump to a medium flow rate for verification. When the verification purpose is to verify whether the maximum alarm threshold 2 setting of the flow meter 14 is reasonable, adjust the preset water delivery value of the adjustable metering pump to the maximum alarm threshold 2. When the verification purpose is to verify whether the range of the flow meter 14 is reasonable, adjust the preset water delivery value of the adjustable metering pump to the design load value of the pipeline of the flow measurement system.

[0044] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A verification method for a flow measurement system, characterized in that, Includes the following steps: S1: The flow-rate water delivery system delivers water to the flow measurement system according to the preset water delivery value; S2: Obtain the real-time measurement value of the flow meter in the flow measurement system; S3: Compare the preset water delivery value with the real-time measurement value to obtain the comparison verification result; S4: Determine whether the flow measurement system meets the design requirements based on the comparison and verification results, including: S4-1: When the comparison verification result shows that the real-time measurement value jumps, it is determined that there is a vacuum in the water supply pipeline at the back end of the flow meter, and a high-level vent is added at the bend near the water outlet of the flow meter. S4-2: When the comparison verification result is 0 for the real-time measurement value, it is determined that the low flow cut-off function of the flow meter is not turned off and / or the pipeline slope is insufficient. The low flow cut-off function of the flow meter is turned off and / or the pipeline slope is adjusted. S4-3: When the comparison verification result shows that the preset water delivery value and the real-time measurement value do not meet the error requirements, it is determined that the pipeline slope is insufficient, and the pipeline slope is adjusted.

2. The verification method according to claim 1, characterized in that, The verification method further includes step S4, which determines whether the flow measurement range in the flow measurement system meets the requirements based on the comparison verification results.

3. The verification method according to claim 2, characterized in that, In step S4, the following steps are included: gradually adjusting the preset water supply value; when the comparison and verification result shows that the real-time measurement value in the flow meter does not change with the increase of the preset water supply value when the preset water supply value is adjusted, it is determined that the flow meter range is unreasonable.

4. The verification method according to claim 1, characterized in that, The verification method further includes step S4, which determines whether the flow meter in the flow measurement system meets the setting requirements based on the comparison verification results.

5. The verification method according to claim 4, characterized in that, In step S4, the following steps are included: adjusting the preset water supply value to the second highest alarm threshold of the flow meter; when the comparison verification result is that the water collection tray overflows, it is determined that the second highest alarm threshold of the flow meter is set unreasonably.

6. A verification device for a flow measurement system, employing the verification method according to any one of claims 1-5, characterized in that, The verification device includes an adjustable water pump, a flow meter that displays the water flow rate, and several connecting pipes; The water pump inlet is connected to the water source through the connecting pipe, and the water pump outlet is connected to the flow meter inlet through the connecting pipe. The outlet of the flow meter is connected to the inlet of the flow measurement system via the connecting pipe.

7. The verification device according to claim 6, characterized in that, The accuracy of the flow meter is higher than 2.5%.

8. The verification device according to claim 6, characterized in that, The water pump is an adjustable metering pump.

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