CN114239194A - Leakage analysis and leakage point positioning method for large-water-volume water delivery pipe network - Google Patents
Leakage analysis and leakage point positioning method for large-water-volume water delivery pipe network Download PDFInfo
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Abstract
The invention provides a leakage loss analysis and leakage point positioning method for a large-water-volume water delivery and supply pipe network. The beneficial effects are as follows: the method can be used for planning and designing large-water-volume water distribution and water delivery and supply networks, and realizes remote monitoring of leakage information and leakage point positioning information of the water supply networks.
Description
Technical Field
The invention relates to a leakage analysis and leakage point positioning method for a large-water-volume water-regulating, water-transporting and water-supplying pipe network, belonging to the field of leakage analysis and leakage point positioning covering a main water supply line and a branch water supply line of a pipe network.
Background
With the increasingly rapid urbanization process, the gradual expansion of urban water supply and water delivery scales, the increasing of the service life of a pipe network, inevitable rusting, hydraulic abrasion and other natural reasons, and other artificial damage reasons in the urban construction process, small leakage and large leakage of pipelines are caused frequently. At present, the average leakage rate of tap water is as high as 17.92%, the highest leakage rate can reach 70%, the lowest leakage rate is 4% of that of Shaoxing, Chongqing always loiters about 15%, most of domestic cities are far away from the required 10% leakage rate, the leakage rate is high, the economic benefit of water supply enterprises is seriously influenced, and pipeline leakage brings great potential safety hazards to roads and surrounding structures where leakage points are located. Therefore, the leakage control of the water supply pipe network is an important work for cost reduction and efficiency improvement of water departments in various regions. To reduce the leakage rate, a set of leakage monitoring, calculating, early warning, analyzing and other technical methods are designed, and the leakage is found in time and the leakage point range is quickly positioned by using a scientific and accurate leakage early warning method and an accurate leakage analysis mathematical model and combining local actual conditions, so that the core of leakage control is realized.
Disclosure of Invention
The invention provides a leakage analysis and leakage point positioning method for a water supply pipe network with large water volume transmission, aiming at solving the problems in the prior art.
The technical scheme of the invention is realized as follows:
a leakage analysis and leakage point positioning method for a large-water-volume water delivery pipe network comprises the following steps:
(1) acquiring pipe network basic information, wherein the pipe network basic information comprises pipe inner diameters D, elevations Z, pipe lengths L, materials and a roughness coefficient C of a main pipeline and branch lines;
(2) arranging an on-line instrument to perform actual measurement on pressure and flow of a pipe network and acquiring coordinate information of the measuring point instrument on the pipe network at typical positions, such as a branch of a main pipeline, a reducing position of a pipeline and an inlet and an outlet of a subarea, wherein the coordinate information comprises an elevation Z and a length L from a starting point of the pipe network;
(3) establishing a big data platform, and continuously recording the pressure and flow values of each measuring point;
(4) combining the information of the pipe network with the sky and ground graph to form a three-dimensional hydraulic model of the practical pipe network;
(5) dividing the pipe network into a plurality of subareas according to the distribution of monitoring points of the pipe network, establishing a mathematical model according to a Hazewai water loss calculation formula, calculating each area, comparing the area with a normal difference range, and outputting a leakage analysis result;
(6) obtaining the partition on-way theoretical water loss according to a Hazeverick hydraulic calculation formula:
in the formula: h isTheory of things-on-way theoretical head loss (in m); q-water flow rate (unit m)3S); l-the length of the pipe along the way (in m); d-inner diameter of the pipeline (unit m); c is the rough coefficient (Haizhong-Williams coefficient) of the pipeline, and the initial value of the C value can be obtained by debugging in the initial stage of the commissioning of the hydraulic model of the pipeline network;
(7) and calculating the actual water loss of the subarea along the way according to the pipe network pressure: h isFruit of Chinese wolfberry＝(Z1+h1)-(Z2+h2)+hjIn the formula, Z1-the pipeline center elevation at sample point 1 (in m); h is1-measured pressure at sample point 1 in MPa, converted in meters；hjThe calculation formula of the on-way local head loss value between the two sampling points (in a short-distance water transmission pipeline, when the pipeline is provided with reducing diameters, the local head loss needs to be considered) is as follows;
xi-local head coefficient, which can be obtained by looking up a table according to the flow rate and the diameter ratio; v is the flow velocity of the water flow (calculated according to the measured water flow Q and the diameter D of the pipeline in the formula); pi-3.14; g-9.8 m/s 2;
(8) according to the established big data platform, real-time data of each subarea is compared and analyzed with historical data, when pressure and flow continuously change suddenly outside a normal change range, a system outputs a leakage alarm, alarm information of a corresponding coordinate position is displayed on a three-dimensional hydraulic model of the pipe network, and the alarm grade is distinguished to be serious, general or slight according to the size of the sudden change range.
(9) When leakage alarm occurs, triggering a leakage positioning calculation module, calculating the coordinate position of a leakage point according to the actual water loss, the theoretical water loss and the reverse direction | hFruit of Chinese wolfberry-hTheory of things|<5 per mill (5 per mill is the allowable error range between the actual water loss and the theoretical water loss), and the calculation is carried out by taking the partition 1 as an example as follows:
during calculation, the C and D values are calculated by taking the parameter of the longer end of the pipe length to participate in calculation, wherein:
ZX0+5the elevation at 0km +5m of the X area;
hX0+5the measured pressure at 0km +5m of the X area;
ZX4+785the elevation at 4km +785m of the X area;
hX4+785measured pressure at 4km +785m of the X region;
ξX0+5is a local water head coefficient between 0km +5m and 4km +785m of the X area and can be consultedIn 15 sections of local head loss in the water drainage design manual, the item of 'sudden reduction' directly selects xi according to the diameter ratio D/D and the flow velocity VX0+5A constant value;
Qx0+5the measured flow is the measured flow at 0km +5m of the X area;
Lxxthe calculated distance is the starting point at the position of 0km +5m of the X area;
l is the total length of the X region from 0km +5m to 4km +785m, and the constant L can be calculated to be 4780 m;
based on the known information, the mathematical model calculates LxxAnd marking and displaying the coordinate range of the missing point on the three-dimensional hydraulic model.
(10) And the other region calculation method is the calculation method shown in step (9).
Preferably, in step (6), as the service life of the pipeline increases, the roughness of the pipe wall increases due to rusting, hydraulic abrasion and the like, and the maximum flow rate of the fluid is reduced after the roughness increases, so that the C value needs to be periodically corrected and adjusted when the service life of the pipeline reaches 8-10 years.
The invention has the beneficial effects that:
by adopting the method for calculating the location of the leakage point based on the leakage early warning and the head loss of real-time pressure and flow measurement, the position coordinates of the leakage point of the pipeline can be accurately calculated, and the location precision of the leakage point is greatly improved;
once the pipe network is lost, the rapid positioning and repair protection are difficult to realize only by manpower, the automation is used, the informatization is combined, the data acquisition can reach the second level, the early warning and positioning range is timely presented on the three-dimensional hydraulic model by the system, and the manpower and material resource cost is greatly reduced;
the three-dimensional hydraulic model is combined with a heaven and earth diagram, a geographic information interface can be displayed on a monitoring picture, a water supply network diagram, data of all pressure and flow detection point positions and geographic coordinates are fused at a glance on the interface, the three-dimensional hydraulic model can also be divided into a plurality of thematic diagrams to check flow operation states, pressure operation states, flow speed operation states, pipe diameter classification, pipe classification and the like respectively, and efficient and timely management strategy guidance is provided for leakage control.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for analyzing leakage of main and branch lines of a water supply network and locating leakage points according to the present invention;
FIG. 2 is a schematic diagram of an example pipe network partition.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, a method for analyzing leakage and locating leakage point of a water supply pipe network for large water volume delivery comprises the following steps:
(1) acquiring pipe network basic information, wherein the pipe network basic information comprises pipe inner diameters D, elevations Z, pipe lengths L, materials and a roughness coefficient C of a main pipeline and branch lines;
(2) arranging an on-line instrument to perform actual measurement on pressure and flow of a pipe network and acquiring coordinate information of the measuring point instrument on the pipe network at typical positions, such as a branch of a main pipeline, a reducing position of a pipeline and an inlet and an outlet of a subarea, wherein the coordinate information comprises an elevation Z and a length L from a starting point of the pipe network;
(3) establishing a big data platform, and continuously recording the pressure and flow values of each measuring point;
(4) combining the information of the pipe network with the sky and ground graph to form a three-dimensional hydraulic model of the practical pipe network;
(5) dividing the pipe network into a plurality of subareas according to the distribution of monitoring points of the pipe network, establishing a mathematical model according to a Hazewai water loss calculation formula, calculating each area, comparing the area with a normal difference range, and outputting a leakage analysis result;
(6) obtaining the partition on-way theoretical water loss according to a Hazeverick hydraulic calculation formula:
in the formula: h isTheory of things-on-way theoretical head loss (in m); q-water flow rate (unit m)3S); l-the length of the pipe along the way (in m); d-inner diameter of the pipeline (unit m); c is the rough coefficient (Haizhong-Williams coefficient) of the pipeline, and the initial value of the C value can be obtained by debugging in the initial stage of the commissioning of the hydraulic model of the pipeline network;
(7) and calculating the actual water loss of the subarea along the way according to the pipe network pressure: h isFruit of Chinese wolfberry＝(Z1+h1)-(Z2+h2)+hjIn the formula, Z1-the pipeline center elevation at sample point 1 (in m); h is1-the measured pressure at the sampling point 1, measured in MPa, converted in meters; h isjThe calculation formula of the on-way local head loss value between the two sampling points (in a short-distance water transmission pipeline, when the pipeline is provided with reducing diameters, the local head loss needs to be considered) is as follows;
xi-local head coefficient, which can be obtained by looking up a table according to the flow rate and the diameter ratio; v is the flow velocity of the water flow (calculated according to the measured water flow Q and the diameter D of the pipeline in the formula); pi-3.14; g-9.8 m/s 2;
(8) according to the established big data platform, real-time data of each subarea is compared and analyzed with historical data, when pressure and flow continuously change suddenly outside a normal change range, a system outputs a leakage alarm, alarm information of a corresponding coordinate position is displayed on a three-dimensional hydraulic model of the pipe network, and the alarm grade is distinguished to be serious, general or slight according to the size of the sudden change range.
(9) When leakage alarm occurs, triggering a leakage positioning calculation module, calculating the coordinate position of a leakage point according to the actual water loss, the theoretical water loss and the reverse direction | hFruit of Chinese wolfberry-hTheory of things|<5 per mill (5 per mill is the allowable error range between the actual water loss and the theoretical water loss), and the calculation is carried out by taking the partition 1 as an example as follows:
during calculation, the C and D values are calculated by taking the parameter of the longer end of the pipe length to participate in calculation, wherein:
ZX0+5the elevation at 0km +5m of the X area;
hX0+5the measured pressure at 0km +5m of the X area;
ZX4+785the elevation at 4km +785m of the X area;
hX4+785measured pressure at 4km +785m of the X region;
ξX0+5for the local head coefficient between 0km +5m and 4km +785m in the X region, the term of 'sudden reduction' in 15 local head loss sections in a water supply and drainage design manual can be consulted, and xi is directly selected according to the diameter ratio D/D and the flow velocity V by comparisonX0+5A constant value;
QX0+5the measured flow is the measured flow at 0km +5m of the X area;
Lxxthe calculated distance is the starting point at the position of 0km +5m of the X area;
l is the total length of the X region from 0km +5m to 4km +785m, and the constant L can be calculated to be 4780 m;
based on the known information, the mathematical model calculates LxxAnd marking and displaying the coordinate range of the missing point on the three-dimensional hydraulic model.
(10) And the other region calculation method is the calculation method shown in step (9).
In step (6), as the service life of the pipeline increases, the roughness of the pipe wall increases due to rusting, hydraulic abrasion and the like, and the maximum flow rate of the fluid is reduced after the roughness increases, so that the C value needs to be periodically corrected and adjusted when the service life of the pipeline reaches 8-10 years.
The method for calculating the location of the leakage point based on the leakage early warning and the head loss of real-time pressure and flow measurement can accurately calculate the position coordinates of the leakage point of the pipeline and greatly improve the location precision of the leakage point.
Once the pipe network leaks, only rely on the manpower to hardly realize quick location and restoration protection, use automation to combine informatization, data acquisition can reach second level, and the system presents early warning and location scope in time on three-dimensional hydraulic model, greatly reduced manpower and materials cost.
The system has a leakage judgment function, can timely give an alarm in a corresponding area on a map, can calculate and calculate the positioning position of a leakage point in real time, can show the leakage point positioning in the form of the map, can show the influence on the water supply range, optimizes the model and improves the positioning accuracy.
The three-dimensional hydraulic model is combined with a heaven and earth diagram, a geographic information interface can be displayed on a monitoring picture, a water supply network diagram, data of all pressure and flow detection point positions and geographic coordinates are fused at a glance on the interface, the three-dimensional hydraulic model can also be divided into a plurality of thematic diagrams to check flow operation states, pressure operation states, flow speed operation states, pipe diameter classification, pipe classification and the like respectively, and efficient and timely management strategy guidance is provided for leakage control.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A leakage analysis and leakage point positioning method for a large-water-volume water delivery pipe network is characterized by comprising the following steps:
(1) acquiring pipe network basic information, wherein the pipe network basic information comprises pipe inner diameters D, elevations Z, pipe lengths L, materials and a roughness coefficient C of a main pipeline and branch lines;
(2) arranging an on-line instrument to perform actual measurement on pressure and flow of a pipe network and acquiring coordinate information of the measuring point instrument on the pipe network at typical positions, such as a branch of a main pipeline, a reducing position of a pipeline and an inlet and an outlet of a subarea, wherein the coordinate information comprises an elevation Z and a length L from a starting point of the pipe network;
(3) establishing a big data platform, and continuously recording the pressure and flow values of each measuring point;
(4) combining the information of the pipe network with the sky and ground graph to form a three-dimensional hydraulic model of the practical pipe network;
(5) dividing the pipe network into a plurality of subareas according to the distribution of monitoring points of the pipe network, establishing a mathematical model according to a Hazewai water loss calculation formula, calculating each area, comparing the area with a normal difference range, and outputting a leakage analysis result;
(6) obtaining the partition on-way theoretical water loss according to a Hazeverick hydraulic calculation formula:
in the formula: h isTheory of things-on-way theoretical head loss (in m); q-water flow rate (unit m)3S); l-the length of the pipe along the way (in m); d-inner diameter of the pipeline (unit m); c is the rough coefficient (Haizhen-Weilian coefficient) of the pipeline, and the initial value of the C value can be obtained by debugging in the initial stage of the commissioning of the hydraulic model of the pipeline network;
(7) and calculating the actual water loss of the subarea along the way according to the pipe network pressure: h isFruit of Chinese wolfberry＝(Z1+h1)-(Z2+h2)+hjIn the formula, Z1-the pipeline center elevation at sample point 1 (in m); h is1-the measured pressure at the sampling point 1, measured in MPa, converted in meters; h isjThe calculation formula of the on-way local head loss value between the two sampling points (in a short-distance water transmission pipeline, when the pipeline is provided with reducing diameters, the local head loss needs to be considered) is as follows;
xi-local head coefficient, which can be obtained by looking up a table according to the flow rate and the diameter ratio; v is the flow velocity of the water flow (calculated according to the measured water flow Q and the diameter D of the pipeline in the formula); pi-3.14; g-9.8 m/s 2;
(8) according to the established big data platform, real-time data of each subarea is compared and analyzed with historical data, when pressure and flow continuously change suddenly outside a normal change range, a system outputs a leakage alarm, alarm information of a corresponding coordinate position is displayed on a three-dimensional hydraulic model of the pipe network, and the alarm grade is distinguished to be serious, general or slight according to the size of the sudden change range.
(9) When leakage alarm occurs, triggering a leakage positioning calculation module, calculating the coordinate position of a leakage point according to the actual water loss, the theoretical water loss and the reverse direction | hFruit of Chinese wolfberry-hTheory of things|<5 per mill (5 per mill is the allowable error range between the actual water loss and the theoretical water loss), and the calculation is carried out by taking the partition 1 as an example as follows:
during calculation, the C and D values are calculated by taking the parameter of the longer end of the pipe length to participate in calculation, wherein:
ZX0+5the elevation at 0km +5m of the X area;
hX0+5the measured pressure at 0km +5m of the X area;
ZX4+785the elevation at 4km +785m of the X area;
hX4+785measured pressure at 4km +785m of the X region;
ξX0+5for the local head coefficient between 0km +5m and 4km +785m in the X region, the term of 'sudden reduction' in 15 local head loss sections in a water supply and drainage design manual can be consulted, and xi is directly selected according to the diameter ratio D/D and the flow velocity V by comparisonX0+5A constant value;
QX0+5the measured flow is the measured flow at 0km +5m of the X area;
Lxxthe calculated distance is the starting point at the position of 0km +5m of the X area;
l is the total length of the X region from 0km +5m to 4km +785m, and the constant L can be calculated to be 4780 m;
based on the known information, it is possible to,l is obtained by calculation of a mathematical modelxxAnd marking and displaying the coordinate range of the missing point on the three-dimensional hydraulic model.
(10) And the other region calculation method is the calculation method shown in step (9).
2. The method for analyzing the leakage and locating the leakage point of the water supply pipe network for large water volume transmission according to claim 1, wherein: in step (6), as the service life of the pipeline increases, the roughness of the pipe wall increases due to rusting, hydraulic abrasion and the like, and the maximum flow rate of the fluid is reduced after the roughness increases, so that the C value needs to be periodically corrected and adjusted when the service life of the pipeline reaches 8-10 years.
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| CN114757108A (en) * | 2022-06-14 | 2022-07-15 | 深圳市拓安信计控仪表有限公司 | Abnormal area identification method based on artificial intelligence and electronic equipment |
| CN114877261A (en) * | 2022-04-25 | 2022-08-09 | 西门子（中国）有限公司 | Method, device and computer readable medium for monitoring state of transportation pipeline |
| CN115235543A (en) * | 2022-07-18 | 2022-10-25 | 宁夏隆基宁光仪表股份有限公司 | Pipe network pipeline service life analysis and alarm method and device for water service system |
| CN116680501A (en) * | 2023-08-01 | 2023-09-01 | 益都智能技术（北京）股份有限公司 | Subarea metering leakage monitoring management method and system based on Internet of things |
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