Power plant circulating water flow measuring device and method thereof

Abstract

The invention discloses a power plant circulating water flow measuring device and a method thereof.The power plant circulating water flow measuring device comprises a maintenance pipe, a sealing cover and an ultrasonic flowmeter, the lower end of the maintenance pipe is connected with the pipe wall of a mother pipe, the sealing cover is arranged at the upper end of the maintenance pipe, and a mounting hole is formed in the sealing cover; the installation hole is arranged in the maintenance pipe so that the space in the maintenance pipe can be communicated with the external environment through the installation hole, the installation hole obliquely extends downwards from inside to outside, a meter head of the ultrasonic flowmeter is located on the ground, a signal line of the ultrasonic flowmeter penetrates through the installation hole, and a probe of the ultrasonic flowmeter is located in the maintenance pipe and attached to the pipe wall of the main pipe. According to the measuring device, the overhaul pipe is welded to the circulating water mother pipe, waterproof treatment is carried out through the sealing cover, compared with a measuring method of additionally arranging an installation well, the installation cost is reduced, the construction period is shortened, and an efficient and convenient solution is provided for power plant circulating water flow measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid measurement, and in particular to a circulating water flow measurement device and a method for measuring the flow rate of power plant. Background Art

[0002] With the rapid development of the power industry, thermal power plants play a vital role in ensuring energy supply. However, in the operation of power plants, circulating water flow is a key parameter, and its measurement accuracy is directly related to the economic benefits and equipment performance of the power plant. At present, ultrasonic flowmeters have been widely used in the measurement of circulating water flow in power plants due to their high accuracy and good stability.

[0003] However, in actual application, there are certain problems with the installation of ultrasonic flowmeters. Due to the large circulating water flow rate in power plants and the large diameter of the circulating water pipe, the ultrasonic flowmeter needs to be installed in the branch pipe section 10D in front and 5D in the back, but many power plants do not have this test position. In order to carry out measurements, the circulating water pipe needs to be excavated, an installation well needs to be added, and waterproofing needs to be performed. This method is not only costly, but also has a long construction period, which has a great impact on the normal operation of the power plant. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a circulating water flow measurement device for a power plant to solve the problem of a long construction period of the current practical measurement method.

[0006] The power plant circulating water flow measurement device according to the embodiment of the present invention comprises:

[0007] An inspection pipe, the inspection pipe extends vertically from the ground to the circulating water jelly pipe of the power plant, and the lower end of the inspection pipe is connected to the pipe wall of the jelly pipe;

[0008] A sealing cover, the sealing cover is arranged at the upper end of the inspection pipe, the sealing cover is provided with a mounting hole, so that the space in the inspection pipe is connected with the external environment through the mounting hole, and the mounting hole extends downwardly in an inclined direction from the inside to the outside;

[0009] An ultrasonic flow meter, wherein the meter head of the ultrasonic flow meter is located on the ground, the signal line of the ultrasonic flow meter passes through the installation hole, and the probe of the ultrasonic flow meter is located in the inspection pipe and attached to the pipe wall of the mother pipe.

[0010] The power plant circulating water flow measurement device of the embodiment of the present invention welds the inspection pipe to the circulating water pipe and performs waterproofing through a sealing cover. Compared with the measurement method of adding an installation well, it reduces the installation cost and shortens the construction period, providing an efficient and convenient solution for the measurement of the power plant circulating water flow.

[0011] In some embodiments, the upper end of the inspection pipe is above the ground.

[0012] In some embodiments, an annular boss is provided between the portion of the inspection pipe that is above the ground and the ground, and the sealing cover is connected to the annular boss.

[0013] In some embodiments, the sealing cover includes a cylinder body and a conical top cover, the mounting hole is provided on the cylinder body, and the outer edge area of ​​the conical top cover is larger than the cross-sectional area of ​​the cylinder body.

[0014] In some embodiments, the barrel is provided with a plurality of ventilation holes, and the plurality of ventilation holes are spaced apart along the axial direction of the barrel.

[0015] In some embodiments, a ladder is provided in the inspection pipe.

[0016] In some embodiments, the portion of the signal line of the ultrasonic flowmeter located inside the inspection pipe is arranged to fit in the wall of the inspection pipe.

[0017] An embodiment of the present invention further provides a method for measuring circulating water flow in a power plant. The method is used for the circulating water flow measuring device in a power plant described in any one of the above embodiments.

[0018] The method for measuring circulating water flow rate of a power plant according to an embodiment of the present invention comprises:

[0019] Find a straight pipe section that meets the requirements of 10D in front and 5D in the rear on the layout diagram of the circulating water jelly pipe of the power plant, where D is the diameter of the circulating water jelly pipe. The straight pipe section is located between the outlet of the circulating water pump and the condenser of the power plant.

[0020] Dig out the circulating water jellyfish pipe and customize two inspection pipes according to the size of the main pipe. The diameter of the inspection pipe should be greater than or equal to 0.8m.

[0021] Weld the bottom of the inspection pipe to the mother pipe to achieve complete sealing between the bottom of the inspection pipe and the mother pipe;

[0022] Fix the probes in the two inspection pipes according to the preset spacing, extend the signal line out to the ground along the wall of each inspection pipe, and connect the meter head on the ground between the two probes;

[0023] A ladder is provided in the inspection pipe, and a sealing cover is provided at the outlet of the inspection pipe.

[0024] In some embodiments, after the mother pipe is dug out, the integrity of the mother pipe is checked, a measuring tool is used to measure the distance between the top surface of the circulating water jellyfish pipe and the ground, and a maintenance pipe is customized according to the measured distance.

[0025] In some embodiments, after the inspection pipe is installed, the excavated earth is backfilled into the pit outside the inspection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the arrangement of a circulating water flow measurement device for a power plant according to an embodiment of the present invention.

[0027] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0028] Figure 3 It is a plan view of the arrangement of a circulating water flow measurement device for a power plant according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 1-mother pipe, 2-inspection pipe, 3-sealing cover, 301-installation hole, 302-vent, 4-flow meter head, 5-flow meter probe, 6-flow meter signal line, 7-annular boss, 8-ladder. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] The following describes a circulating water flow measurement device for a power plant according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0033] like Figures 1 to 3 As shown, the power plant circulating water flow measurement device according to the embodiment of the present invention comprises: an inspection pipe 2, a sealing cover 3 and an ultrasonic flow meter.

[0034] The inspection pipe 2 extends vertically from the ground to the circulating water mother pipe 1 of the power plant, and the lower end of the inspection pipe 2 is connected to the pipe wall of the mother pipe 1 by welding, so as to achieve complete sealing between the inspection pipe 2 and the mother pipe 1, and prevent the external groundwater from entering and damaging the flow meter probe 5. In addition, the upper end of the inspection pipe 2 is higher than the ground, so as to prevent rainwater on the ground from entering through the inspection pipe 2 and flooding the flow meter probe 5.

[0035] The sealing cover 3 is arranged at the upper end of the inspection pipe 2, and the sealing cover 3 is used to block the outlet of the inspection pipe 2. The sealing cover 3 is provided with a mounting hole 301, so that the space in the inspection pipe 2 is connected with the external environment through the mounting hole 301, and the mounting hole 301 is used to allow the flow meter signal line 6 to pass through, and the mounting hole 301 extends downwardly in an inclined direction from the inside to the outside, so as to prevent rainwater from flowing into the inspection pipe 2 through the mounting hole 301, and further improve the installation performance of the device.

[0036] The flow meter head 4 is located on the ground, the flow meter signal line 6 passes through the mounting hole 301, and the flow meter probe 5 is located in the inspection pipe 2 and attached to the pipe wall of the mother pipe 1. In other words, the flow meter probe 5 is fixed on the pipe wall of the mother pipe 1 and located in the inspection pipe 2, and the flow meter probe 5 is connected to the flow meter head 4 on the ground through the flow meter signal line 6 passing through the mounting hole 301, so that the measurement data signal is transmitted to the flow meter head 4 and the measurement result is displayed.

[0037] Therefore, the power plant circulating water flow measurement device of the embodiment of the present invention welds the inspection pipe 2 to the circulating water pipe 1 and performs waterproofing through the sealing cover 3. Compared with the measurement method of adding an installation well, it reduces the installation cost and shortens the construction period, providing an efficient and convenient solution for the measurement of the power plant circulating water flow.

[0038] In some embodiments, Figure 1 As shown, an annular boss 7 is provided between the portion of the inspection pipe 2 that is above the ground and the ground, and the sealing cover 3 is connected to the annular boss 7 .

[0039] It is understandable that the support connection of the sealing cover 3 is realized by adding the annular boss 7. Optionally, the annular boss 7 can be made of cement casting, and bolts are drilled on the annular boss 7 to realize the detachable connection between the sealing cover 3 and the annular boss 7 by bolt connection, so that the maintenance personnel can open the sealing cover 3 and enter the inspection pipe 2 conveniently.

[0040] In some embodiments, Figure 1 and Figure 2 As shown, the sealing cover 3 includes a cylinder body and a conical top cover, the mounting hole 301 is arranged on the cylinder body, and the outer edge area of ​​the conical top cover is larger than the cross-sectional area of ​​the cylinder body.

[0041] It is understandable that the conical top cover serves to keep out rain, and when it rains, rainwater can flow from the conical top cover to the surrounding ground.

[0042] Furthermore, if Figure 1 and Figure 2As shown, the cylinder body is provided with a plurality of vent holes 302, and the plurality of vent holes 302 are spaced apart along the axial direction of the cylinder body. Since the temperature of the water in the circulating jellyfish tube 1 is always higher than the temperature of the outside air, the temperature of the air in the inspection pipe 2 rises, and the vent holes 302 are used to circulate the air in the inspection pipe 2 and the outside air to take away the heat in the inspection pipe 2, and prevent the temperature in the inspection pipe 2 from overheating and generating condensed water, thereby maintaining a dry environment in the inspection pipe 2.

[0043] In some embodiments, Figure 1 and Figure 3 As shown, a ladder 8 is provided in the inspection pipe 2, and maintenance personnel can enter and exit the inspection pipe 2 along the ladder 8, thereby improving the convenience of maintenance operations.

[0044] In some embodiments, Figure 1 and Figure 2 As shown, the portion of the flow meter signal line 6 located in the inspection pipe 2 is arranged to fit the pipe wall of the inspection pipe 2 to reduce space occupancy and facilitate connection and protection of the flow meter signal line 6 .

[0045] The following describes a method for measuring circulating water flow in a power plant according to an embodiment of the present invention. The method is used for the circulating water flow measuring device in a power plant in any of the above embodiments.

[0046] The method for measuring circulating water flow rate of a power plant according to an embodiment of the present invention comprises:

[0047] On the layout diagram of circulating water jelly pipe 1 in the power plant, find a straight pipe section that meets the requirements of 10D in front and 5D in the back, where D is the diameter of circulating water jelly pipe 1. The straight pipe section is located between the circulating water pump outlet and the condenser of the power plant. Because the pipeline pressure between them is relatively high, the circulating water can fill the pipe, making it easier to accurately measure the circulating water flow rate.

[0048] The circulating water jellyfish pipe 1 is dug out, and two inspection pipes 2 are customized according to the size of the mother pipe 1. The diameter of the inspection pipe 2 is greater than or equal to 0.8m, which is convenient for maintenance personnel to enter the inspection pipe 2 to inspect and maintain the ultrasonic flowmeter.

[0049] The bottom of the inspection pipe 2 is welded to the mother pipe 1 to achieve complete sealing between the bottom of the inspection pipe 2 and the mother pipe 1 to prevent external groundwater from entering and damaging the flow meter probe 5.

[0050] The flowmeter probes 5 are fixed in the two inspection pipes 2 at a preset interval to ensure the measurement accuracy. The flowmeter signal line 6 is extended to the ground along the pipe wall of each inspection pipe 2, and the flowmeter head 4 is connected to the ground between the two flowmeter probes 5 to realize the flow display and signal transmission.

[0051] A ladder 8 is provided in the inspection pipe 2, and the maintenance personnel can enter and exit the inspection pipe 2 along the ladder 8. A sealing cover 3 is provided at the outlet of the inspection pipe 2 to achieve sealing of the inspection pipe 2 and prevent rainwater from entering the inspection pipe 2.

[0052] Optionally, the process of digging out the circulating jellyfish tube 1:

[0053] Preliminary preparation: Determine the location of the straight pipe section that needs to be excavated based on the layout diagram of the circulating jellyfish pipe 1 of the power plant, and formulate a detailed construction plan and safety measures.

[0054] Excavation: Excavation is carried out using mechanical equipment such as excavators according to the pre-defined scope until the top of the circulating jellyfish tube 1 is exposed above the ground.

[0055] Check the mother pipe 1: After digging out the mother pipe 1, check the integrity of the mother pipe 1 to ensure there are no leakage, cracks, etc. If there are any problems, they need to be repaired in time.

[0056] Measurement data: Use a measuring tool to measure the distance between the top surface of the circulating jellyfish tube 1 and the ground, so as to customize the maintenance tube 2 later.

[0057] Further, the lowering process of the inspection pipe 2:

[0058] Installation of the inspection pipe 2: transport the inspection pipe 2 to the construction site, and use a crane or other equipment to slowly lower the inspection pipe 2 into the dug pit.

[0059] Welding seal: Weld the bottom of the inspection pipe 2 to the circulating water mother pipe 1 to ensure that the inspection pipe 2 and the bottom mother pipe 1 are completely sealed to prevent external groundwater from entering.

[0060] Check the sealing: After welding is completed, check the sealing between the inspection pipe 2 and the main pipe 1 to ensure there is no leakage.

[0061] Backfilling earth: After the inspection pipe 2 is installed, the excavated earth is backfilled into the pit outside the inspection pipe 2. During the backfilling process, care must be taken to avoid damaging the inspection pipe 2.

[0062] Construction completion: After backfilling is completed, clean up the construction site to ensure that the construction area is clean.

[0063] Therefore, through the above process of digging out the circulating water jellyfish pipe 1 and lowering the maintenance pipe 2, conditions are provided for the subsequent installation of the ultrasonic flowmeter, and a convenient maintenance channel is also provided for the measurement of the circulating water flow in the power plant.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A circulating water flow measurement device for a power plant, characterized in that: include: An inspection pipe, the inspection pipe extends vertically from the ground to the circulating water jelly pipe of the power plant, and the lower end of the inspection pipe is connected to the pipe wall of the jelly pipe; A sealing cover, the sealing cover is arranged at the upper end of the inspection pipe, the sealing cover is provided with a mounting hole, so that the space in the inspection pipe is connected with the external environment through the mounting hole, and the mounting hole extends downwardly in an inclined direction from the inside to the outside; An ultrasonic flow meter, wherein the meter head of the ultrasonic flow meter is located on the ground, the signal line of the ultrasonic flow meter passes through the installation hole, and the probe of the ultrasonic flow meter is located in the inspection pipe and attached to the pipe wall of the mother pipe.

2. The power plant circulating water flow measurement device according to claim 1, characterized in that: The upper end of the inspection pipe is higher than the ground.

3. The power plant circulating water flow measurement device according to claim 2, characterized in that: An annular boss is provided between the part of the inspection pipe that is above the ground and the ground, and the sealing cover is connected to the annular boss.

4. The power plant circulating water flow measurement device according to claim 3, characterized in that: The sealing cover comprises a cylinder body and a conical top cover, the mounting hole is arranged on the cylinder body, and the outer edge area of ​​the conical top cover is larger than the cross-sectional area of ​​the cylinder body.

5. The power plant circulating water flow measurement device according to claim 4, characterized in that: The barrel is provided with a plurality of vent holes, which are spaced apart along the axial direction of the barrel.

6. The power plant circulating water flow measurement device according to claim 1, characterized in that: A ladder is arranged in the inspection pipe.

7. The power plant circulating water flow measurement device according to claim 1, characterized in that: The portion of the signal line of the ultrasonic flowmeter located in the inspection pipe is arranged to fit in the wall of the inspection pipe.

8. A method for measuring circulating water flow in a power plant, characterized in that: The measuring method is used for the circulating water flow measuring device of a power plant according to any one of claims 1 to 7, and the measuring method comprises: Find a straight pipe section that meets the requirements of 10D in front and 5D in the rear on the layout diagram of the circulating water jelly pipe of the power plant, where D is the diameter of the circulating water jelly pipe. The straight pipe section is located between the outlet of the circulating water pump and the condenser of the power plant. Dig out the circulating water jellyfish pipe and customize two inspection pipes according to the size of the main pipe. The diameter of the inspection pipe should be greater than or equal to 0.8m. Weld the bottom of the inspection pipe to the mother pipe to achieve complete sealing between the bottom of the inspection pipe and the mother pipe; Fix the probes in the two inspection pipes according to the preset spacing, extend the signal line out to the ground along the pipe wall of each inspection pipe, and connect the meter head on the ground between the two probes; A ladder is provided in the inspection pipe, and a sealing cover is provided at the outlet of the inspection pipe.

9. The method for measuring circulating water flow in a power plant according to claim 8, characterized in that: After digging out the mother pipe, check the integrity of the mother pipe, use measuring tools to measure the distance between the top surface of the circulating water jellyfish pipe and the ground, and customize the maintenance pipe according to the measured distance.

10. The method for measuring circulating water flow in a power plant according to claim 9, characterized in that: After the inspection pipe is installed, the excavated soil is backfilled into the pit outside the inspection pipe.

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