CN213900752U - Water pipeline leakage early warning data monitoring device based on hydraulic transient simulation - Google Patents
Water pipeline leakage early warning data monitoring device based on hydraulic transient simulation Download PDFInfo
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- CN213900752U CN213900752U CN202023061279.4U CN202023061279U CN213900752U CN 213900752 U CN213900752 U CN 213900752U CN 202023061279 U CN202023061279 U CN 202023061279U CN 213900752 U CN213900752 U CN 213900752U
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Abstract
The utility model discloses a hydraulic transient simulation-based water pipeline leakage early warning data monitoring device, which comprises two differential pressure monitoring modules arranged at the front end and the rear end of a tiled water pipeline, wherein each differential pressure monitoring module comprises a differential pressure transmitter which is arranged between two pressure taking holes with the interval more than or equal to 20 meters on the water pipeline; the pressure measuring holes are connected with the differential pressure transmitter through pipelines, a first pressure sensor is arranged on a connecting pipeline of one pressure measuring hole and the differential pressure transmitter, a second pressure sensor is arranged on a water conveying pipeline between the two differential pressure monitoring modules, and a third pressure sensor is arranged behind the differential pressure monitoring module at the rear end; and the water pipeline is provided with an ultrasonic flowmeter. The utility model discloses a rational arrangement of multiple sensor has controlled the cost promptly, can guarantee measured data's accuracy again. The effective monitoring of various data can ensure the accuracy of the calculation results of a negative pressure wave method, a pressure gradient method and a pressure flow mass analysis method.
Description
Technical Field
The utility model relates to a water conservancy water delivery field especially involves the hydraulic duct leakage early warning data monitoring devices based on hydraulic transient emulation.
Background
An irrigation pipeline is arranged behind a sand-water power plant dam and led to the downstream from an upstream reservoir, the pipeline path penetrates through the whole plant area and is also close to the outer side of the enclosing wall of a booster station and a switching station, agricultural irrigation water and domestic water are mainly provided for people in sand-water power plants in the downstream, the pipe diameter is 0.8m, the total length of the pipeline is more than five hundred meters, the pipeline is put into operation in 1975 and has been operated for 45 years, the pipeline has serious safety threat to the life and property of people in the downstream due to leakage of the pipeline due to large pipe diameter, large flow and high pressure along with aging and corrosion of equipment when pipeline pressure characteristic change is caused by hydraulic transient, and large economic loss is caused by interruption of agricultural irrigation water and domestic water of people in sand-water power plants in the Anzhen in two times; meanwhile, the pipeline is close to the outer sides of the enclosing walls of the booster station and the switch station, so that some important infrastructures in a factory are seriously threatened, and great potential safety hazards exist. Therefore, a mathematical model for hydraulic transient simulation of the water delivery pipeline needs to be established, the leakage of the water delivery pipeline is subjected to prediction analysis and monitoring, the water leakage can be accurately forecasted and controlled in a linkage manner under the condition that the water delivery pipeline leaks, the problem of water resource waste and the problem of potential safety hazard caused by pipeline leakage are prevented from occurring due to pipe explosion or large-scale leakage, a reliable technical scheme is provided for the prediction analysis and monitoring of the leakage of the same type of water delivery pipeline, beneficial reference is provided for similar enterprises, and good application value and popularization value are formed.
In consideration of the fact that a hydraulic transient simulation method is adopted to simulate the pipeline system behind the power station dam, the pipeline system behind the power station dam needs to be parameterized first, and a pressure pipeline unsteady flow equation is solved in a targeted mode conveniently.
A hydraulic transient mathematical model of a power station reservoir and a pipeline behind a dam (comprising two domestic water supply pipelines and a water pump) is established, the pressure and speed change rule of hydraulic components is described in a mathematical form, and the energy and pressure loss characteristics of the positions of the components are determined. And comparing the simulation calculation result with the field test data, and verifying and correcting the mathematical model.
When a mathematical model of a power station pipeline system is established, pipelines behind a dam can be described by a pressure pipeline unsteady flow equation, and certain boundary conditions need to be set at an inlet and an outlet of the pipeline system. By giving the pressure and velocity at the boundary, the initial and accompanying conditions for equation solution are formed. The setting of boundary conditions is very important, wherein the water level value of an upstream reservoir and the opening degree of a tail end valve are the most critical, and the change of the water level in the long-term operation process of a power station is referred to, so that the pressure difference of an inlet and an outlet of a pipeline is determined, and the solution of the pressure change inside the pipeline is more accurate. And under the conditions of different reservoir water levels, performing flow simulation calculation on different running states of the domestic water supply pump in the processes of starting, pumping and stopping the pump, and determining the real-time state of the hydraulic characteristic of the pipeline.
During and after the pipe burst occurs, the mathematical model of the piping system will change. The leakage point formed after the pipe explosion can be regarded as an outlet boundary and has the characteristics of a certain equivalent diameter, local pressure, pressure gradient, flow velocity and the like. Therefore, on the basis of the original mathematical model, the pipeline system mathematical model needs to be corrected according to the pipe bursting position and the assumed value of the equivalent diameter of the pipe bursting position, so as to form a hydraulic transient prediction mathematical model under the pipe bursting event.
Based on a mathematical model of the pipeline hydraulic system, a one-dimensional characteristic line method is adopted to predict the hydraulic characteristics of the pipeline hydraulic system. The method mainly predicts the characteristics of pressure change, speed change, pressure wave transmission and the like between the inlet and the outlet of the pipeline. The prediction results obtained under different boundary conditions can be compared with field test data, and the mathematical model is verified and corrected while hydraulic characteristics of the pipeline system before pipe bursting are determined.
And after the pipe explosion event occurs, correcting the mathematical model according to the characteristics of the pipe explosion position, the pipe explosion equivalent diameter, the pipe explosion equivalent leakage amount and the like. Then, the change of the internal hydraulic characteristics (pressure, flow, speed and the like) of the pipeline hydraulic system under the condition of pipe bursting at different positions is predicted. Specifically, the hydraulic characteristic transient change rule of a typical position (a site monitoring position) is analyzed, and the influence of the occurrence of a pipe bursting event on the transient hydraulic characteristic of the system is determined. And comparing the mathematical prediction result as a field monitoring result to provide a basis for the analysis and early warning of the pipe burst. And establishing a mathematical model of the pipe bursting position, comparing and analyzing the hydraulic characteristics of the pipeline during normal work and leakage on the basis of a hydraulic transient calculation result, predicting the position and leakage amount of a leakage point, and providing a criterion for monitoring and controlling the leakage alarm of the system and closing a water inlet valve in a linkage manner.
The detection principles of a negative pressure wave leak detection method, a pressure gradient method and a pressure-flow-quality analysis method are researched and analyzed, meanwhile, real-time monitoring data of an ultrasonic flowmeter and a pressure transmitter are obtained by combining a field pipeline leakage point simulation test, and a reliable and applicable pipeline leakage monitoring mathematical model is established on the basis of analyzing and knowing the distribution characteristics of pipeline pressure and flow.
A negative pressure wave method: when the water pipe leaks, because the pressure in the water pipe is higher than the external air pressure, water at the leaking position flows out rapidly, the pressure drops suddenly, and negative pressure waves can be generated at the leaking moment. The negative pressure wave is rapidly transmitted to two ends of the pipeline at a certain speed, and after a plurality of times, the negative pressure wave is respectively detected by three pressure sensors arranged at two ends of a leakage point. According to the waveform characteristics of the detected negative pressure wave, whether leakage occurs can be judged, and meanwhile, the position of the leakage point can be determined according to the time difference of the negative pressure wave transmitted to the three pressure sensors. The propagation speed of the negative pressure wave is a variable physical quantity, and is influenced by factors such as the elastic modulus of the pipeline, the thickness of the pipe wall, the diameter of the pipe and the like, and the leakage position can be judged more accurately by dynamically correcting in real time by the following method.
As shown in fig. 1, the distance X between the pipe leakage point and the point P2 is calculated as follows:
X＝[L+S*(t2-t1)/(t3-t2)]/2
in the formula, t1, t2, and t3 are times at which the negative pressure wave reaches points P1, P2, and P3, respectively.
Pressure gradient method: the viscosity coefficient, the on-way friction coefficient, the density and other parameters of the medium conveyed by the water conveying pipeline are temperature functions, under the ideal condition (isothermal) of stable flow, the pressure gradient along the pipeline is a straight line with a fixed slope, the upstream flow of a leakage point is increased during leakage, the pressure gradient is increased, the downstream flow of the leakage point is reduced, the corresponding pressure gradient is also reduced, the pressure gradient is changed from the straight line to a broken line, and the leakage point can be judged by finding the second type of discontinuity point.
Specifically, two pressure sensors are provided at the upstream and downstream ends of the pipeline to detect pressure signals, and the pressure gradients of the upstream and downstream pipelines are calculated from the upstream and downstream pressure signals. When no leakage occurs, the pressure gradient along the pipeline is in an oblique straight line; when leakage occurs, the flow rate in front of the leakage point is increased, the pressure gradient is steep, the flow rate behind the leakage point is reduced, the pressure gradient is flattened, the pressure gradient along the pipeline is in a broken line shape, the broken point is the leakage point, the position of the leakage point can be calculated, and the positioning principle is shown in figure 2.
The distance X between the pipeline leakage point and the point on P is calculated according to the following formula:
in the formula, the upper P is inlet pressure; outlet pressure is below P; g is the pressure gradient upstream of the leakage point; the pressure gradient downstream of the leakage point is below G; l is the length of the pipeline.
Pressure-flow-mass analysis: the pressure-flow-mass analysis method is based on the conservation of mass or volume of the fluid flowing in the pipe, i.e. the difference between the injected and the discharged amount of liquid should be equal to the amount of fluid stagnating in the pipe. After the pipeline runs stably, the inflow and outflow are considered to be equal, and therefore when the input and output flows of multiple points of the pipeline are detected, if the difference value is larger than a certain range, the fact that leakage possibly occurs in the detected pipeline is indicated. The temperature, pressure, density, viscosity, etc. of the fluid material in the pipe may change as it travels along the pipe, which is prone to false detection. In practical application, the correction can be carried out by the following formula:
QL＝Qi-Qo-Qa
in the formula, QL is the volume flow of the pipeline leakage; qi and Qo are the volume flow of the inlet and the outlet of the measuring section respectively; qa is the change in fluid volume in the pipe with respect to temperature, volume, pressure, density, viscosity, etc. When QL exceeds the set threshold, the early warning and leakage fault warning are carried out, and the position of the leakage point can be calculated by flow, upstream and downstream measuring point pressure, a water head, the length of the pipeline and the diameter of the pipeline.
When the pressure flow mass analysis method is used for leakage detection, the accuracy of the flowmeter and the estimation of the residual quantity of fluid substances in the pipeline have certain influence on the leakage detection accuracy.
The distance between the flow meters should not be set too far to ensure the accuracy of the fluid mass balance prediction in the pipe between the flow meters. The pressure flow mass analysis method has larger detection error when detecting the pipeline with constantly changing operation conditions and the condition of small leakage amount, and can be matched with the two methods for use.
The leakage points can be monitored by the aid of the different methods, the leakage points have advantages and disadvantages, monitoring accuracy can be effectively improved and specific leakage positions can be judged only by using multiple modes together, different sensors are usually arranged at specific positions in the prior art and used for measuring required data, accurate measurement cannot be achieved by the aid of the modes, transient pressure changes can be effectively acquired, and measuring accuracy is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the weak point among the above-mentioned prior art and provide a data measurement accuracy, safe and reliable's water pipe leakage early warning data monitoring devices based on hydraulic transient emulation.
The utility model discloses a realize through following mode:
the water pipeline leakage early warning data monitoring device based on hydraulic transient simulation comprises two differential pressure monitoring modules arranged at the front end and the rear end of a tiled water pipeline; the differential pressure monitoring module comprises a differential pressure transmitter; the differential pressure transmitter is arranged between two pressure taking holes with the interval more than or equal to 20 meters on the water conveying pipeline; the pressure measuring holes are connected with the differential pressure transmitter through pipelines, a first pressure sensor is arranged on a connecting pipeline of one pressure measuring hole and the differential pressure transmitter, a second pressure sensor is arranged on a water conveying pipeline between the two differential pressure monitoring modules, and a third pressure sensor is arranged behind the differential pressure monitoring module at the rear end; the water conveying pipeline is provided with an ultrasonic flowmeter; the ultrasonic flowmeter is arranged on the side of the pipe section where one of the pressure taking holes of the differential pressure monitoring module is located.
Further, the diameter of the pressure taking hole is 6 mm; a reinforcing plate with the thickness of 10mm is welded on the pressure taking hole; and the pressure taking hole is connected with the differential pressure transmitter through a three-way valve arranged on the pipeline.
Furthermore, the pipeline at the installation position of the second pressure sensor does not need to be provided with a hole, and the second pressure sensor uses a pressure measuring hole of the existing pressure gauge.
Furthermore, a pressure measuring hole is formed at the mounting position of the third pressure sensor; the diameter of the pressure taking hole is 6 mm; a reinforcing plate with the thickness of 10mm is welded on the pressure taking hole; and the pressure measuring hole is connected with a third pressure sensor through a three-way valve arranged on the pipeline.
The beneficial effects of the utility model reside in that: the transient pressure of 4 sections is measured through the first pressure sensor, the second pressure sensor and the third pressure sensor respectively, more accurate transient pressure change in the water pipeline can be obtained, and the three-way valve is arranged, so that daily drainage and pollution discharge are facilitated. The differential pressure detection module is installed through reasonable pipe section span, so that the cost is controlled, and the accuracy of measured data can be guaranteed. The effective monitoring of various data can ensure the accuracy of the calculation results of a negative pressure wave method, a pressure gradient method and a pressure flow mass analysis method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of negative pressure wave analysis for determining leak location.
FIG. 2 is a schematic diagram of a pressure gradient method.
Fig. 3 is a schematic structural diagram of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 3, the water pipe leakage early warning data monitoring device based on hydraulic transient simulation comprises two differential pressure monitoring modules arranged at the front end and the rear end of a tiled water pipe 1; the differential pressure monitoring module comprises a differential pressure transmitter 2, and the differential pressure transmitter 2 adopts a high-precision American Rosemont 3051CD differential pressure transmitter; the differential pressure transmitter 2 is arranged between two pressure taking holes 7 with the interval equal to 20 meters on the water pipeline 1; the pressure measuring holes 7 are connected with the differential pressure transmitter 2 through pipelines, a first pressure sensor 3 is arranged on a connecting pipeline of one pressure measuring hole 7 and the differential pressure transmitter 2, a second pressure sensor 5 is arranged on a water conveying pipeline 1 between the two differential pressure monitoring modules, and a third pressure sensor 6 is arranged behind the differential pressure monitoring module at the rear end; an ultrasonic flowmeter 4 is arranged on the water pipeline, and the ultrasonic flowmeter 4 adopts a Nippon Fuji FSSC high-precision clamping type ultrasonic flowmeter; the ultrasonic flowmeter 4 is arranged on the side of the pipe section where one of the pressure taking holes 7 of the differential pressure monitoring module is located, and a set of ultrasonic flowmeter is arranged on the horizontal section of the water conveying pipeline at the front section and the rear section, namely, the position of one of the pressure taking holes 7 of the two differential pressure monitoring modules is respectively provided with one set of ultrasonic flowmeter, so that the flow rate of the pipeline flowing into and flowing out of the section is compared in real time to check whether the water conveying pipeline leaks, and the leakage flow rate can be accurately measured when the leakage occurs.
In an embodiment of the present invention, the diameter of the pressure tapping hole 7 is 6 mm; a reinforcing plate 8 with the thickness of 10mm is welded on the pressure taking hole 7; and the pressure taking hole 7 is connected with the differential pressure transmitter 2 through a three-way valve 9 arranged on the pipeline.
The utility model discloses an in the embodiment, 5 installation department pipelines of second pressure sensor need not trompil, and second pressure sensor 5 uses the pressure cell of current manometer.
In an embodiment of the present invention, a pressure tapping hole 7 is formed at the mounting position of the third pressure sensor 6; the diameter of the pressure taking hole 7 is 6 mm; a reinforcing plate 8 with the thickness of 10mm is welded on the pressure taking hole 7; the pressure measuring hole 7 is connected with a third pressure sensor 6 through a three-way valve 9 arranged on the pipeline.
In an embodiment of the present invention, the first pressure sensor 3, the second pressure sensor 5, and the third pressure sensor 6 all adopt german dema shi EDC pressure sensors.
The utility model discloses a first, second, third pressure sensor measure 4 sectional transient state pressures respectively, can obtain more accurate transient state pressure change in the conduit, through setting up the three-way valve, the daily drainage blowdown of being convenient for. The differential pressure detection module is installed through reasonable pipe section span, so that the cost is controlled, and the accuracy of measured data can be guaranteed. The effective monitoring of various data can ensure the accuracy of the calculation results of a negative pressure wave method, a pressure gradient method and a pressure flow mass analysis method.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. Water pipe leakage early warning data monitoring devices based on hydraulic transient simulation, its characterized in that: comprises two differential pressure monitoring modules which are arranged at the front end and the rear end of a tiled water conveying pipeline (1); the differential pressure monitoring module comprises a differential pressure transmitter (2); the differential pressure transmitter (2) is arranged between two pressure taking holes (7) with the interval more than or equal to 20 meters on the water conveying pipeline (1); the pressure measuring holes (7) are connected with the differential pressure transmitters (2) through pipelines, a first pressure sensor (3) is arranged on a connecting pipeline between one pressure measuring hole (7) and the differential pressure transmitter (2), a second pressure sensor (5) is arranged on a water pipeline (1) between the two differential pressure monitoring modules, and a third pressure sensor (6) is arranged behind the differential pressure monitoring module positioned at the rear end; an ultrasonic flowmeter (4) is arranged on the water delivery pipeline; the ultrasonic flowmeter (4) is arranged on the side of the pipe section where one of the pressure taking holes (7) of the differential pressure monitoring module is located.
2. The hydraulic transient simulation-based water pipeline leakage early warning data monitoring device as claimed in claim 1, wherein: the diameter of the pressure taking hole (7) is 6 mm; a reinforcing plate (8) with the thickness of 10mm is welded on the pressure taking hole (7); and the pressure taking hole (7) is connected with the differential pressure transmitter (2) through a three-way valve (9) arranged on the pipeline.
3. The hydraulic transient simulation-based water pipeline leakage early warning data monitoring device as claimed in claim 1, wherein: the pipeline at the installation position of the second pressure sensor (5) does not need to be provided with a hole, and the second pressure sensor (5) uses a pressure measuring hole of the existing pressure gauge.
4. The hydraulic transient simulation-based water pipeline leakage early warning data monitoring device as claimed in claim 1, wherein: a pressure taking hole (7) is formed in the mounting position of the third pressure sensor (6); the diameter of the pressure taking hole (7) is 6 mm; a reinforcing plate (8) with the thickness of 10mm is welded on the pressure taking hole (7); and the pressure measuring hole (7) is connected with a third pressure sensor (6) through a three-way valve (9) arranged on the pipeline.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216056A (en) * | 2021-12-22 | 2022-03-22 | 华能酒泉发电有限公司 | Method for measuring local pressure loss of conveying steam pipe |
| CN116557793B (en) * | 2023-07-10 | 2023-12-05 | 中建安装集团有限公司 | System and method for monitoring running state of heat supply pipeline integrating pressure sensing and temperature sensing |
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2020
- 2020-12-17 CN CN202023061279.4U patent/CN213900752U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216056A (en) * | 2021-12-22 | 2022-03-22 | 华能酒泉发电有限公司 | Method for measuring local pressure loss of conveying steam pipe |
| CN116557793B (en) * | 2023-07-10 | 2023-12-05 | 中建安装集团有限公司 | System and method for monitoring running state of heat supply pipeline integrating pressure sensing and temperature sensing |
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