Method and system for measuring water volume of steam generator

Abstract

The invention discloses a steam generator water volume measurement method and system, and belongs to the technical field of cavity volume measurement, pulse type water injection is performed on a steam generator cavity, water flow is intermittently impacted and injected into the steam generator cavity at a certain frequency through pulse type water injection, an air film and an air cavity formed by air attached to the corners of the cavity are broken, and the water volume of the steam generator is measured. The air is exhausted out of the cavity, so that the steam generator is effectively filled with the full volume, and the effectiveness of the measured value of the water volume of the steam generator is ensured and the measurement precision is improved; when the amount of water in the cavity is large, the mode of large instantaneous flow is adopted for pumping water, and the pumping efficiency is improved; when the amount of water in the cavity is small, the mode of small instantaneous flow is adopted for pumping water, the measurement precision of the flow in the water pumping process is improved, and then the measurement precision of the second volume is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cavity volume measurement, and particularly relates to a method and system for measuring the water volume of a steam generator. Background Art

[0002] In industrial production, steam generators with various structural forms have emerged. The nominal water volume is less than the regulatory lower limit value of 30 liters. In some of these products, the actual water volume often exceeds the nominal volume, which poses a problem for the supervision of special equipment. Therefore, it is necessary to measure the actual water volume of the steam generator. Current irregular cavity volume measurement techniques include the liquid filling method, the pressure excitation method, the quantitative gas filling and expansion method, the linear regression method, the gas state equation method, the three-dimensional scanning method, and so on. Since steam generators often consist of multiple components and have a complex structure, there are easily narrow and tortuous structures that form local spaces with air retention, and there are often small local spaces. The above existing methods cannot achieve high-precision measurement of the water volume of steam generators with complex structures. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a method and system for measuring the water volume of a steam generator. By pulsed water injection, water flows into the cavity of the steam generator intermittently at a certain frequency, breaking the air film and air cavity formed by air adhering to the corners, and carrying the air out of the cavity, so as to effectively fill the entire volume inside the steam generator, thereby facilitating the improvement of the measurement accuracy of the cavity volume.

[0004] A method for measuring the water volume of a steam generator according to an embodiment of the first aspect of the present invention is used to measure an irregular cavity. The measurement method includes: Performing pulsed water injection into the cavity until the cavity is filled; Pumping the water in the cavity outwards at a first instantaneous flow rate and obtaining the water level in the cavity; When the water level drops to a preset water level, stop pumping outwards and obtain the first volume of the water pumped out of the cavity; Pumping the water in the cavity outwards at a second instantaneous flow rate, where the second instantaneous flow rate is less than the first instantaneous flow rate; When the water in the cavity is emptied, stop pumping outwards and obtain the second volume of the water pumped out of the cavity; Calculating the volume of the cavity according to the first volume and the second volume.

[0005] The method for measuring the water volume of a steam generator according to an embodiment of the present invention has at least the following beneficial effects: Pulse water injection is performed on the cavity. Through pulse water injection, the water flow impacts and injects into the cavity of the steam generator intermittently at a certain frequency, breaking the air film and air cavity formed by the attachment of air in the corners, and discharging the air from the cavity by entrainment, so as to effectively fill the entire volume inside the steam generator, which is convenient for improving the measurement accuracy of the cavity volume. Then, the water in the cavity is pumped outwards at a first instantaneous flow rate until the water level drops to a preset water level, and the volume of the water pumped out of the cavity is obtained as the first volume. Then, the instantaneous flow rate of the pumped water is reduced, and the water in the cavity is pumped outwards at a second instantaneous flow rate until the water in the cavity is emptied, and the volume of the water pumped out of the cavity is obtained as the second volume. Then, the volume of the cavity is calculated through the first volume and the second volume. When there is more water in the cavity, the water is pumped at a larger instantaneous flow rate to improve the pumping efficiency. When there is less water in the cavity, the water is pumped at a smaller instantaneous flow rate to improve the measurement accuracy of the flow rate during the water pumping process, and further improve the measurement accuracy of the second volume.

[0006] According to some embodiments of the present invention, the pumping the water in the cavity outwards at a first instantaneous flow rate includes: Pumping the water in the cavity outwards through a plurality of first drain pipes connected in parallel; Obtaining the first cumulative flow rate of each of the first drain pipes; The obtaining the first volume of the water pumped out of the cavity includes: Calculating the first volume according to all the first cumulative flow rates.

[0007] According to some embodiments of the present invention, the obtaining the first volume of the water pumped out of the cavity further includes: Obtaining the first temperature of the cavity and obtaining the second temperature of each of the first drain pipes; Calculating the first volume according to the first temperature, all the second temperatures, all the first cumulative flow rates and the volume expansion coefficient of water.

[0008] According to some embodiments of the present invention, the pumping the water in the cavity outwards at a second instantaneous flow rate includes: Pumping the water in the cavity outwards through a second drain pipe and obtaining the second cumulative flow rate of the second drain pipe; The obtaining the second volume of the water pumped out of the cavity includes: Obtaining the first temperature of the cavity and obtaining the third temperature of the second drain pipe; Calculating the second volume according to the first temperature, the third temperature, the second cumulative flow rate and the volume expansion coefficient of water.

[0009] According to some embodiments of the present invention, the pulsed water injection into the cavity includes: Inject water into the cavity at a first frequency and a third instantaneous flow rate for a preset time; Inject water into the cavity at a second frequency and a fourth instantaneous flow rate until the cavity is filled. The first frequency is greater than the second frequency, and the third instantaneous flow rate is less than the fourth instantaneous flow rate.

[0010] A steam generator water volume measurement system according to an embodiment of the second aspect of the present invention is used to implement the steam generator water volume measurement method as described in the above embodiments. The measurement system includes: A pulse pump for pulsed water injection into the cavity; A liquid extraction pump for connecting to the cavity and pumping the water in the cavity outwards at a first instantaneous flow rate or a second instantaneous flow rate.

[0011] The steam generator water volume measurement system according to an embodiment of the present invention has at least the following beneficial effects: The pulse pump is used to perform pulsed water injection into the cavity. Through pulsed water injection, the water flow impacts and injects into the steam generator cavity intermittently at a certain frequency, breaking the air film formed by the attachment of air in the corners, entraining the air and discharging it from the cavity, so as to effectively fill the entire volume inside the steam generator, facilitating the improvement of the measurement accuracy of the cavity volume; then, the liquid extraction pump is used to pump the water in the cavity outwards at a first instantaneous flow rate until the water level drops to a preset water level, and the volume of the water extracted from the cavity is obtained as the first volume. Then, the instantaneous flow rate of pumping water is reduced, and the water in the cavity is pumped outwards at a second instantaneous flow rate until the water in the cavity is emptied, and the volume of the water extracted from the cavity is obtained as the second volume. Then, the volume of the cavity is calculated through the first volume and the second volume; when there is more water in the cavity, the water is pumped at a larger instantaneous flow rate to improve the pumping efficiency; when there is less water in the cavity, the water is pumped at a smaller instantaneous flow rate to improve the measurement accuracy of the flow rate during the water pumping process, thereby improving the measurement accuracy of the second volume.

[0012] According to some embodiments of the present invention, the measurement system further includes: A first pipeline having a first inlet end and a first outlet end. The first inlet end is connected to the liquid extraction pump. A first valve is provided at the first inlet end. A plurality of branch pipes connected in parallel with each other are provided between the first inlet end and the first outlet end. Each branch pipe is respectively provided with a first flow meter; A second pipeline connected to the liquid extraction pump. The second pipeline is provided with a second valve and a second flow meter. The second valve is located between the liquid extraction pump and the second flow meter. The range of the second flow meter is smaller than the range of the first flow meter.

[0013] According to some embodiments of the present invention, each of the branch pipes is provided with a water inlet valve and a water outlet valve, the first flowmeter is located between the water inlet valve and the water outlet valve, and the first pipeline further includes: A plurality of series pipes, the plurality of series pipes successively connect a plurality of the first flowmeters in series, and each of the series pipes is provided with a third valve.

[0014] According to some embodiments of the present invention, before performing the method for measuring the water volume of the steam generator, open the third valves to connect the first flowmeters in series, start the liquid extraction pump and obtain the instantaneous flow rate readings of the first flowmeters.

[0015] According to some embodiments of the present invention, a first one-way valve is provided between each of the first flowmeters and the first outlet end, and a second one-way valve is provided in the second pipeline. Description of the Drawings

[0016] Figure 1 is a flowchart of a method for measuring the water volume of a steam generator according to an embodiment of the present invention; Figure 2 is a flowchart of performing pulsed water injection in an embodiment of the present invention; Figure 3 is a flowchart of obtaining the first cumulative flow rate in an embodiment of the present invention; Figure 4 is a flowchart of calculating the first volume in an embodiment of the present invention; Figure 5 is a flowchart of calculating the second volume in an embodiment of the present invention; Figure 6 is a schematic structural diagram of a steam generator water volume measurement system according to an embodiment of the present invention.

[0017] Reference numerals: liquid extraction pump 100, first pipeline 200, first inlet end 201, first outlet end 202, first valve 210, branch pipe 220, water inlet valve 221, first flowmeter 230, series pipe 240, third valve 250, first one-way valve 260, second pipeline 300, second valve 310, second flowmeter 320, second one-way valve 330. Detailed Description of the Embodiments

[0018] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as front, back, up, down, axial direction, circumferential direction, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, the meaning of "a plurality of" is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If the first and second are described, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0021] In the description of the present invention, it should be noted that terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0022] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the drawings. Obviously, the following described embodiments are some embodiments of the present invention, not all embodiments.

[0023] At present, steam generators with various structural forms have emerged in industrial production, and the nominal water volume is less than the regulatory lower limit value of 30 liters. Among them, the actual water volume of some products often exceeds 200 liters, far exceeding the nominal volume, which brings difficulties to the supervision of special equipment. At present, the water volume measurement technologies for steam generators include the liquid filling method, the pressure excitation method, the quantitative gas charging and expansion method, the linear regression method, the gas state equation method, the three-dimensional scanning method, and so on. Since steam generators often consist of multiple components and have a complex structure, it is easy to have local spaces with narrow and tortuous structures that form air retention, and there are often local spaces less than 10 mm. The above existing methods cannot achieve high-precision measurement of the water volume of steam generators with complex structures.

[0024] Refer to Figures 1 to 5 As shown, the present invention provides a method for measuring the water volume of a steam generator.

[0025] Refer to Figure 1 As shown, the measurement method includes the following steps.

[0026] Step S100, inject water into the cavity in a pulsed manner until the cavity is filled.

[0027] Water is injected into the cavity of the steam generator in a pulsed manner. Through pulsed water injection, the water flow impacts and injects into the cavity of the steam generator intermittently at a certain frequency, breaking the air film formed by the attachment of air at the corners of the cavity, entraining the air and discharging it from the cavity, so as to effectively fill the cavity of the steam generator.

[0028] Step S200: Pump out the water in the cavity at a first instantaneous flow rate and obtain the water level in the cavity.

[0029] Pump out the water in the cavity at the first instantaneous flow rate, causing the water level in the cavity to drop. And monitor the water level in the cavity in real time. When the water level in the cavity is relatively high, the water can be pumped out at a large flow rate to improve the pumping efficiency, and the water level in the cavity is monitored in real time to avoid the influence of too low water level on the flow measurement accuracy of subsequent small-flow pumping.

[0030] Step S300: When the water level drops to a preset water level, stop pumping outwards and obtain the first volume of the water pumped out of the cavity.

[0031] Set the preset water level. When the water level in the cavity drops to the preset water level, stop the pumping operation of the cavity, count the cumulative flow rate of the water pumped out of the cavity during this period, or the water in the cavity is pumped out into an external container, and the volume is calculated by measuring the volume of the water in the container or measuring the mass of the water in the container, and then the volume of the water pumped out during this period is set as the first volume.

[0032] Step S400: Pump out the water in the cavity at a second instantaneous flow rate, and the second instantaneous flow rate is less than the first instantaneous flow rate.

[0033] After obtaining the first volume, reduce the instantaneous flow rate of pumping water from the first instantaneous flow rate to the second instantaneous flow rate. By reducing the instantaneous flow rate of pumping water, a flowmeter with a smaller range is matched. The measurement accuracy of the flowmeter with a smaller range is higher. Furthermore, it is ensured that the drainage volume can be accurately measured before the cavity is emptied of water, and the measurement accuracy of the cavity volume is improved.

[0034] Step S500: When the water in the cavity is emptied, stop pumping outwards and obtain the second volume of the water pumped out of the cavity.

[0035] After emptying the water in the cavity, stop the pumping operation of the cavity, count the cumulative flow rate of the water pumped out of the cavity during this period, or the water in the cavity is pumped out into an external container, and the volume is calculated by measuring the volume of the water in the container or measuring the mass of the water in the container, and then the volume of the water pumped out during this period is set as the second volume.

[0036] Step S600: Calculate the volume of the cavity according to the first volume and the second volume.

[0037] Finally, calculate the volume of the cavity by adding the first volume and the second volume measured in the two periods of time.

[0038] Pulse - type water injection is carried out on the cavity. Through pulse - type water injection, the water flow impacts and injects into the cavity of the steam generator intermittently at a certain frequency, breaking the air film formed by the attachment of air in the corners, carrying the air out of the cavity, and achieving effective filling of the steam generator, so as to improve the measurement accuracy of the cavity volume.

[0039] After that, the water in the cavity is pumped outwards at a first instantaneous flow rate until the water level drops to a preset water level, and the volume of the water pumped out of the cavity is obtained as the first volume. Then, the instantaneous flow rate of the pumped - out water is reduced, and the water in the cavity is pumped outwards at a second instantaneous flow rate until the water in the cavity is emptied, and the volume of the water pumped out of the cavity is obtained as the second volume. Then, the volume of the cavity is calculated through the first volume and the second volume.

[0040] When there is more water in the cavity, a way with a larger instantaneous flow rate is adopted to pump out the water to improve the pumping efficiency; when there is less water in the cavity, a way with a smaller instantaneous flow rate is adopted to pump out the water to improve the measurement accuracy of the flow rate during the water - pumping process, and thus improve the measurement accuracy of the second volume.

[0041] In some embodiments, referring to Figure 2 As shown, step S100, pulse - type water injection into the cavity, includes the following steps.

[0042] Step S110, inject water into the cavity at a first frequency and a third instantaneous flow rate for a preset time.

[0043] Step S120, inject water into the cavity at a second frequency and a fourth instantaneous flow rate until the cavity is filled. The first frequency is greater than the second frequency, and the third instantaneous flow rate is less than the fourth instantaneous flow rate.

[0044] During the preset time in the early stage of water injection, high - frequency and low - flow pulse - type water injection is adopted to finely clean the corners, reduce air residue, make the water flow impact and inject into the cavity of the steam generator intermittently at a certain frequency, break the air film formed by the attachment of air in the corners, and ensure that the air at the internal corners or included angles of the cavity can be discharged with the impact of the water flow.

[0045] In the later stage, it is switched to low - frequency and high - flow pulse - type water injection to quickly fill the main space, avoid air re - entering the cavity due to too long water - injection time, and then carry the air out of the cavity to achieve effective filling of the steam generator, so as to improve the measurement accuracy of the cavity volume.

[0046] In some embodiments, referring to Figure 3 As shown, step S200, pump out the water in the cavity at a first instantaneous flow rate, includes the following steps.

[0047] Step S210, pump out the water in the cavity through multiple first drain pipes connected in parallel.

[0048] To accelerate the drainage speed, multiple parallel first drain pipes are provided for drainage, so that the water in the cavity is discharged through the multiple parallel first drain pipes. The water in the cavity is split into multiple first drain pipes, and the flow rates of the multiple first drain pipes can be separately counted to accelerate the measurement efficiency of the cavity volume.

[0049] Step S220, obtain the first cumulative flow rate of each first drain pipe.

[0050] The water in the cavity is discharged through multiple first drain pipes. Since the water flow rate discharged in the early stage is large and relatively stable, a flow meter with a large range is set in each first drain pipe, and the first cumulative flow rate of each first drain pipe is obtained by using the flow meter.

[0051] Step S300, obtain the first volume of the water pumped out of the cavity, including the following steps.

[0052] Step S301, calculate the first volume according to all the first cumulative flow rates.

[0053] During the time when the water level in the cavity drops from the full state to the preset water level, add up the multiple first cumulative flow rates to obtain the first volume of the cavity drainage.

[0054] In some embodiments, referring to Figure 4 As shown, step S300, obtain the first volume of the water pumped out of the cavity, and further includes the following steps.

[0055] Step S310, obtain the first temperature of the cavity and the second temperature of each first drain pipe.

[0056] Since the time for the steam generator to convert from the operating process to the measurement process is short, after the steam generator stops operating, the temperature of the steam generator cavity is still at a relatively high temperature. After water is injected into the cavity, the temperature of the cavity and the water will gradually decrease, but the temperature of the cavity is still higher than the temperature of the external first drain pipe. Therefore, it is necessary to measure the first temperature of the cavity and the second temperature of each first drain pipe to verify the temperature drop situation when the water in the cavity is discharged into the multiple first drain pipes.

[0057] Step S320, calculate the first volume according to the first temperature, all the second temperatures, all the first cumulative flow rates and the volume expansion coefficient of water.

[0058] Since the water in the cavity is discharged through multiple first drain pipes, after measuring the second temperature of each first drain pipe, taking one of the first drain pipes as an example, according to the water volume expansion coefficient formula V1 = V2×[1 + a×(T2 - T1)], where V1 is the initial volume of the water in the cavity discharged through this first drain pipe, V2 is the actual volume of the water discharged through this first drain pipe, a is the water volume expansion coefficient, T2 is the second temperature, and T1 is the first temperature, the initial volume of the water discharged from the cavity through each first drain pipe can be calculated. Then, by adding up all the initial volumes to calculate the first volume, the error caused by temperature changes in the measurement of the cavity volume can be reduced, and the measurement accuracy of the cavity volume can be improved.

[0059] In some embodiments, referring to Figure 5 as shown, step S400, pumping the water in the cavity outwards at a second instantaneous flow rate, includes the following steps.

[0060] Step S401, pumping the water in the cavity outwards through a second drain pipe to obtain the second cumulative flow rate of the second drain pipe.

[0061] The amount of water discharged in the later stage of the cavity is small. An independent second drain pipe is set for discharge, and a flow meter with a smaller range is set to measure the second cumulative flow rate of the second drain pipe, avoiding measurement errors caused by a large difference between the flow meter range and the actual flow rate, and improving the measurement accuracy.

[0062] Step S500, obtaining the second volume of the water pumped out of the cavity, includes the following steps.

[0063] Step S510, obtaining the first temperature of the cavity and the third temperature of the second drain pipe.

[0064] Since the time for the steam generator to convert from the operating process to the measurement process is short, after the steam generator stops operating, the temperature of the steam generator cavity is still at a relatively high temperature. After injecting water into the cavity and draining a large amount of water to lower the water level to the preset water level, the temperature of the cavity and the water will gradually decrease, but the temperature of the cavity is still higher than the temperature of the external second drain pipe. Therefore, it is necessary to measure the first temperature of the cavity and the third temperature of each second drain pipe to verify the temperature drop situation when the water in the cavity is discharged to the second drain pipe.

[0065] Step S520, calculating the second volume based on the first temperature, the third temperature, the second cumulative flow rate, and the water volume expansion coefficient.

[0066] After water is injected into the cavity and a large amount of drainage is carried out to lower the water level to a preset water level, since the water in the cavity is discharged through the second drain pipe, after measuring the third temperature of the second drain pipe, according to the water volume expansion coefficient formula V3 = V4×[1 + a×(T3 - T1)], where V3 is the initial volume of the water discharged from the cavity in the second drain pipe, V4 is the actual volume of the water discharged from the second drain pipe, a is the water volume expansion coefficient, T3 is the third temperature, and T1 is the first temperature, the initial volume of the water discharged from the cavity through the second drain pipe, which is the second volume, can be calculated, reducing the error caused by temperature changes in the measurement of the cavity volume and improving the measurement accuracy of the cavity volume.

[0067] Referring to Figure 6 As shown, the present invention also provides a water volume measurement system for a steam generator, which is used to implement the water volume measurement method for the steam generator as described in the above embodiments.

[0068] The measurement system includes a pulse pump and a liquid extraction pump 100.

[0069] A pulse pump is a device that uses a pulsed liquid supply method to transport liquids. By electromagnetic force or mechanical force, the piston moves back and forth to generate pulsed flow and transport the liquid out. In this embodiment, a pulse pump is used to inject water into the cavity of the steam generator.

[0070] The liquid extraction pump 100 is used to connect to the bottom of the cavity of the steam generator, and the liquid extraction pump 100 can pump the water in the cavity to the outside in the manner of the first instantaneous flow rate or the second instantaneous flow rate.

[0071] The pulse pump is used to inject water into the cavity in a pulsed manner. By pulsed water injection, the water flow impacts and injects into the cavity of the steam generator intermittently at a certain frequency, breaking the air film formed by the attachment of air in the corners and carrying the air out of the cavity, realizing the effective filling of the steam generator, so as to improve the measurement accuracy of the cavity volume.

[0072] After that, the liquid extraction pump 100 is used to pump the water in the cavity to the outside at the first instantaneous flow rate until the water level drops to the preset water level, and the volume of the water extracted from the cavity is obtained as the first volume. Then, the instantaneous flow rate of pumping water is reduced, and the water in the cavity is pumped to the outside at the second instantaneous flow rate until the water in the cavity is emptied, and the volume of the water extracted from the cavity is obtained as the second volume. Then, the volume of the cavity is calculated through the first volume and the second volume.

[0073] When there is more water in the cavity, the water is pumped at a larger instantaneous flow rate to improve the pumping efficiency; when there is less water in the cavity, the water is pumped at a smaller instantaneous flow rate to improve the measurement accuracy of the flow rate during the water pumping process, and further improve the measurement accuracy of the second volume.

[0074] In some embodiments, referring to Figure 6As shown, the measurement system further includes a first pipeline 200 and a second pipeline 300.

[0075] The first pipeline 200 is provided with a first inlet end 201 and a first outlet end 202. The first inlet end 201 is communicated with the liquid extraction pump 100. The first inlet end 201 is provided with a first valve 210 that can control the on-off. The first pipeline 200 is further provided with a plurality of parallel branch pipes 220. The first inlet end 201 and the first outlet end 202 are respectively communicated with both ends of the plurality of branch pipes 220. Each branch pipe 220 is provided with a first flowmeter 230.

[0076] The second pipeline 300 is communicated with the liquid extraction pump 100, and a second valve 310 is provided at the connection between the second pipeline 300 and the liquid extraction pump 110. The second valve 310 controls the on-off of the second pipeline 300. The second pipeline 300 is provided with a second flowmeter 320, and the range of the second flowmeter 320 is smaller than that of the first flowmeter 230.

[0077] When the liquid extraction pump 100 pumps the water in the cavity outwards at a first instantaneous flow rate, the first valve 210 is opened and the second valve 310 is closed, so that the water in the cavity is pumped out through the first pipeline 200 until the water level in the cavity drops to a preset water level, and the volume of the water pumped out of the cavity is obtained as a first volume through the cumulative flow measured by the plurality of first flowmeters 230. Then, the instantaneous flow rate of the liquid extraction pump 100 for pumping water is reduced, and the water in the cavity is pumped outwards at a second instantaneous flow rate until the water in the cavity is emptied, so that the water in the cavity is pumped out through the second pipeline 300, and the volume of the water pumped out of the cavity is obtained as a second volume through the cumulative flow measured by the second flowmeter 320. Then, the volume of the cavity is calculated through the first volume and the second volume.

[0078] When the amount of water in the cavity is large, the first pipeline 200 is conducted, and the water is pumped in a manner with a larger instantaneous flow rate. The water is pumped through the plurality of branch pipes 220, and the plurality of first flowmeters respectively count the cumulative flow rate to improve the pumping efficiency; when the amount of water in the cavity is small, the water is pumped in a manner with a smaller instantaneous flow rate, the second pipeline 300 is conducted, and the second flowmeter 320 with a smaller range is correspondingly set to improve the measurement accuracy of the flow rate during the water pumping process, and further improve the measurement accuracy of the second volume.

[0079] In some embodiments, refer to Figure 6As shown, water inlet valves 221 and water outlet valves 222 are respectively arranged at both ends of each branch pipe 220. The water inlet valve 221 and the water outlet valve 222 are located at both ends of the first flowmeter 230. Moreover, a plurality of series pipes 240 are also arranged on the first pipeline 200. One series pipe 240 is arranged between every two adjacent branch pipes 220. Both ends of the series pipe 240 are respectively communicated with the water outlet end of the first flowmeter 230 of one branch pipe 220 and the water inlet end of the first flowmeter 230 of another adjacent branch pipe 220. And a third valve 250 for controlling on / off is arranged on each series pipe 240.

[0080] First, turn on the first valve 210, open all the series pipes 240, open the water inlet valve 221 in front of the first flowmeter 230 at the front end after being connected in series, and open the water outlet valve 222 behind the first flowmeter 230 at the rear end after being connected in series, so that a plurality of first flowmeters 230 are connected in series.

[0081] When connected in series, the function of the plurality of first flowmeters 230 is to verify each other. In addition, in order to eliminate accidental errors in testing, usually the average value is taken after multiple measurements. Therefore, connecting a plurality of first flowmeters 230 in series instead of repeating the operation multiple times, removing the measured values of the first flowmeters 230 with abnormal readings, and calculating the average value according to the cumulative flow measured by the remaining first flowmeters 230.

[0082] In some embodiments, referring to Figure 6 As shown, before performing the method for measuring the water volume of the steam generator in the above embodiment, before using the first pipeline 200 to drain the water in the cavity, it is necessary to verify the accuracy difference between the plurality of first flowmeters 230 to avoid affecting the accuracy of the first volume due to abnormal cumulative flow statistics of one or more first flowmeters 230. For this purpose, first turn on the first valve 210, open all the series pipes 240, open the water inlet valve 221 in front of the first flowmeter 230 at the front end after being connected in series, and open the water outlet valve 222 behind the first flowmeter 230 at the rear end after being connected in series, so that a plurality of first flowmeters 230 are connected in series.

[0083] After that, start the liquid extraction pump 100 to pump the test liquid into the first pipeline 200, so that the test liquid passes through the plurality of first flowmeters 230 connected in series, thereby verifying the instantaneous flow difference between the plurality of first flowmeters 230 to ensure the normal operation of all the first flowmeters 230, and further ensuring the measurement accuracy of the first volume.

[0084] In some embodiments, referring to Figure 6 As shown, each branch pipe 220 is provided with a first one-way valve 260. The first one-way valve 260 is arranged between the first flowmeter 230 and the first outlet end 202. A second one-way valve 330 is arranged at the rear end of the second pipeline 300.

[0085] The first one-way valve 260 and the second one-way valve 330 are provided to prevent the backflow of the discharged water from affecting the measurement accuracy.

[0086] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those of ordinary skill in the art.

Claims

1. A method for measuring the water volume of a steam generator, characterized in that, For measuring an irregular cavity, the measuring method includes: Performing pulsed water injection into the cavity until the cavity is filled; Pumping the water in the cavity outwards at a first instantaneous flow rate and obtaining the water level in the cavity; When the water level drops to a preset water level, stop pumping outwards and obtain a first volume of the water pumped out of the cavity; Pumping the water in the cavity outwards at a second instantaneous flow rate, the second instantaneous flow rate being less than the first instantaneous flow rate; When the water in the cavity is emptied, stop pumping outwards and obtain a second volume of the water pumped out of the cavity; Calculating the volume of the cavity based on the first volume and the second volume.

2. The method for measuring the water volume of a steam generator according to claim 1, characterized in that, The pumping the water in the cavity outwards at a first instantaneous flow rate includes: Pumping the water in the cavity outwards through a plurality of parallel first drain pipes; Obtaining a first cumulative flow rate of each of the first drain pipes; The obtaining the first volume of the water pumped out of the cavity includes: Calculating the first volume based on all the first cumulative flow rates.

3. The method for measuring the water volume of a steam generator according to claim 2, characterized in that The obtaining the first volume of the water pumped out of the cavity further includes: Obtaining a first temperature of the cavity and obtaining a second temperature of each of the first drain pipes; Calculating the first volume based on the first temperature, all the second temperatures, all the first cumulative flow rates and the volume expansion coefficient of water.

4. The method for measuring the water volume of a steam generator according to claim 1, characterized in that, The pumping the water in the cavity outwards at a second instantaneous flow rate includes: Pumping the water in the cavity outwards through a second drain pipe and obtaining a second cumulative flow rate of the second drain pipe; The obtaining the second volume of the water pumped out of the cavity includes: Obtaining a first temperature of the cavity and obtaining a third temperature of the second drain pipe; Calculating the second volume based on the first temperature, the third temperature, the second cumulative flow rate and the volume expansion coefficient of water.

5. The method for measuring the water volume of a steam generator according to claim 1, characterized in that The performing pulsed water injection into the cavity includes: Injecting water into the cavity at a first frequency and a third instantaneous flow rate for a preset time; Injecting water into the cavity at a second frequency and a fourth instantaneous flow rate until the cavity is filled, the first frequency being greater than the second frequency, and the third instantaneous flow rate being less than the fourth instantaneous flow rate.

6. A steam generator water volume measurement system, characterized in that, A measuring system for implementing the steam generator water volume measuring method according to any one of claims 1 to 5, the measuring system includes: A pulse pump for performing pulsed water injection into the cavity; A liquid extraction pump for communicating with the cavity and pumping the water in the cavity outwards at a first instantaneous flow rate or a second instantaneous flow rate.

7. The steam generator water volume measurement system according to claim 6, characterized in that, The measuring system further includes: A first pipeline provided with a first inlet end and a first outlet end, the first inlet end communicating with the liquid extraction pump, the first inlet end being provided with a first valve, and a plurality of mutually parallel branch pipes being provided between the first inlet end and the first outlet end, and each branch pipe being respectively provided with a first flow meter; A second pipeline communicating with the liquid extraction pump, the second pipeline being provided with a second valve and a second flow meter, the second valve being located between the liquid extraction pump and the second flow meter, and the measuring range of the second flow meter being less than the measuring range of the first flow meter.

8. The steam generator water volume measurement system according to claim 7, characterized in that, Each of the branch pipes is provided with a water inlet valve and a water outlet valve. The first flowmeter is located between the water inlet valve and the water outlet valve. The first pipeline further includes: A plurality of series pipes, and a plurality of the first flowmeters are serially connected in sequence by the plurality of series pipes. Each of the series pipes is provided with a third valve.

9. The steam generator water volume measurement system according to claim 8, characterized in that Before performing the method for measuring the water volume of the steam generator, open the third valves to connect the first flowmeters in series, start the liquid extraction pump, and obtain the instantaneous flow rate readings of the first flowmeters.

10. The steam generator water volume measurement system according to claim 7, characterized in that, A first one-way valve is provided between each of the first flowmeters and the first outlet end, and a second one-way valve is provided in the second pipeline.

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