A method and device for determining the lowest pressure point of a pipe network

Abstract

The present invention discloses a method and device for determining the lowest pressure point of a pipeline network provided by an embodiment of the present invention, the method comprising: obtaining the pipeline network information of the pipeline network to be determined, and obtaining the gas source point information and the user node information according to the pipeline network information; then calculating the path with the minimum pressure loss according to the gas source point information and the user node information, and combining the first shortest path algorithm; finally, according to the path with the minimum pressure loss, obtaining the pressure loss and corresponding to each path with the minimum pressure loss, and determining the first pressure point according to the pipeline network information and multiple pressure loss and, obtaining the lowest pressure point of the pipeline network; wherein, the lowest pressure point of the pipeline network includes the first pressure point. The use of the embodiment of the present invention can improve the accuracy of determining the lowest pressure point of the gas pipeline network.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a method and device for determining the lowest pressure point of a pipe network. Background Art

[0002] As the scale of the pipeline network expands, the types of users in the pipeline network and the way users use gas have also changed significantly: the proportion of residential gas consumption is getting smaller and smaller, while the proportion of industrial and commercial users is getting higher and higher. In large urban gas companies, industrial and commercial users account for more than 50% of the gas consumption or even higher. Residential users have low requirements for the pressure of pipeline gas, while industrial users are very sensitive to the pressure and flow of the pipeline network. Therefore, gas companies are required to continue to pay attention to the pressure and flow of the pipeline network, dynamically optimize the pipeline network structure, and improve the gas supply capacity of the pipeline network. Among them, the minimum pressure of the pipeline network is crucial to the construction and operation of gas companies.

[0003] For example, the layout of medium and high pressure pipelines in gas planning and the location selection of gas supply points are closely related to the situation of the lowest pressure area of ​​the pipeline network. The selection of key pipeline equipment such as pressure regulating equipment in gas engineering construction is closely related to the lowest pressure index of the medium pressure pipeline network. Therefore, it is very important to monitor the lowest pressure of the pipeline network scientifically and accurately. Inappropriate lowest pressure index of the pipeline network may increase the investment in pipeline construction, waste the transmission and distribution capacity of existing pipeline equipment, and increase the cost of gas use for end users; it may also cause insufficient pressure at the lowest point of the pipeline network, and user needs cannot be met, resulting in shutdown and production, causing social losses.

[0004] In the prior art, the determination of the lowest pressure point of the pipeline network is mainly carried out through the following two methods:

[0005] 1. Based on the small number of pressure monitoring points that have been installed, monitor the historical changes in pressure and determine the lowest pressure point based on operational experience. This method is expensive and the cost of large-scale installation is high. There is currently no scientific method for selecting installation points, which is mainly based on experience. At the same time, due to environmental factors such as equipment conditions and power supply conditions, not all pipeline nodes are suitable for installing pressure monitoring points. The inaccurate installation position of the pressure monitoring point further leads to the inaccurate determination of the lowest pressure point of the pipeline network.

[0006] 2. Use hydraulic calculation method to simulate and calculate the lowest pressure point. However, given the characteristics of urban gas pipelines, the complex pipeline network (multiple loops, large number of pipelines) and the complexity of user composition, modeling is quite difficult. The estimation accuracy of urban gas user gas consumption is relatively low, the structure is affected by gas consumption, and the calculation cycle is long, so the calculation results based on the lowest pressure point of urban gas user gas consumption are also inaccurate.

[0007] In summary, the existing method for determining the lowest pressure point of the pipeline network is not accurate. Summary of the invention

[0008] The embodiments of the present invention provide a method and device for determining the lowest pressure point of a pipe network, thereby improving the accuracy of determining the lowest pressure point of a gas pipe network.

[0009] A first aspect of an embodiment of the present application provides a method for determining the lowest pressure point of a pipe network, comprising:

[0010] Obtain the pipeline network information of the pipeline network to be determined, and obtain the gas source point information and user node information according to the pipeline network information;

[0011] According to the gas source point information and user node information, and combined with the first shortest path algorithm, the path with minimum pressure loss is calculated;

[0012] According to the path with minimum pressure loss, after obtaining the pressure loss and corresponding to each path with minimum pressure loss, after determining the first pressure point according to the pipeline network information and multiple pressure loss sums, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the first pressure point.

[0013] In a possible implementation of the first aspect, the path with minimum pressure loss is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically:

[0014] According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer;

[0015] According to the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated;

[0016] According to the sum of the pressure losses of the multiple first paths, a path with minimum pressure loss between the N gas source points and each user node is obtained.

[0017] In a possible implementation manner of the first aspect, according to the first shortest path algorithm, the sum of the pressure losses of the multiple first paths is calculated, specifically:

[0018] According to the Arit-Suri formula, the first calculation formula is simplified to obtain the second calculation formula; wherein the first calculation formula is used to calculate the friction resistance loss per unit length of the pipeline;

[0019] According to the preset conditions, the second calculation formula is simplified to obtain the path pressure loss calculation formula;

[0020] According to the path pressure loss calculation formula and the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated.

[0021] In a possible implementation manner of the first aspect, the method further includes:

[0022] According to the gas source point information and user node information, and combined with the first shortest path algorithm, the shortest distance path is calculated;

[0023] According to the shortest distance path, after obtaining the sum of the pipeline lengths corresponding to each shortest distance path, after determining the second pressure point according to the pipeline network information and the sum of multiple pipeline lengths, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the second pressure point.

[0024] In a possible implementation manner of the first aspect, the method further includes:

[0025] The pipeline network to be determined is optimized according to the lowest pressure point of the pipeline network, specifically:

[0026] The first path with the shortest distance is used as the first preset condition to shorten the first path with the minimum pressure loss; wherein the first path with the minimum pressure loss is the path with the minimum pressure loss corresponding to the lowest pressure point of the pipe network;

[0027] The first shortest distance path is shortened with the straight-line distance as the second preset condition; wherein the first shortest distance path is the shortest distance path corresponding to the lowest pressure point of the pipe network;

[0028] Shorten the straight-line distance between the gas source point and the lowest pressure point in the pipeline network.

[0029] In a possible implementation manner of the first aspect, obtaining the pipe network information of the pipe network to be determined is specifically:

[0030] Obtain the basic data of the pipeline network and establish a pipeline network model based on the basic data;

[0031] The pipeline network topology map is obtained according to the pipeline network model, and after error correction is performed according to the pipeline network topology map, the pipeline network information is generated and obtained.

[0032] A second aspect of the embodiment of the present application provides a device for determining the lowest pressure point of a pipe network, comprising: an acquisition module, a calculation module and a determination module;

[0033] Among them, the acquisition module is used to obtain the pipeline network information of the pipeline network to be determined, and obtain the gas source point information and user node information according to the pipeline network information;

[0034] The calculation module is used to calculate the path with minimum pressure loss based on the gas source point information and the user node information and in combination with the first shortest path algorithm;

[0035] The determination module is used to obtain the pressure loss and corresponding to each path with minimum pressure loss according to the path with minimum pressure loss, and then determine the first pressure point according to the pipeline network information and multiple pressure loss sums to obtain the lowest pressure point of the pipeline network; wherein the lowest pressure point of the pipeline network includes the first pressure point.

[0036] In a possible implementation of the second aspect, the path with minimum pressure loss is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically:

[0037] According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer;

[0038] According to the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated;

[0039] According to the sum of the pressure losses of the multiple first paths, a path with minimum pressure loss between the N gas source points and each user node is obtained.

[0040] In a possible implementation manner of the second aspect, according to the first shortest path algorithm, the sum of the pressure losses of the multiple first paths is calculated, specifically:

[0041] According to the Aritsouri formula, the first calculation formula is simplified to obtain the second calculation formula; wherein the first calculation formula is used to calculate the friction resistance loss per unit length of the pipeline;

[0042] According to the preset conditions, the second calculation formula is simplified to obtain the path pressure loss calculation formula;

[0043] According to the path pressure loss calculation formula and the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated.

[0044] In a possible implementation manner of the second aspect, the method further includes:

[0045] According to the gas source point information and user node information, and combined with the first shortest path algorithm, the shortest distance path is calculated;

[0046] According to the shortest distance path, after obtaining the sum of the pipeline lengths corresponding to each shortest distance path, after determining the second pressure point according to the pipeline network information and the sum of multiple pipeline lengths, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the second pressure point.

[0047] Compared with the prior art, an embodiment of the present invention provides a method and device for determining the lowest pressure point of a pipeline network, the method comprising: acquiring pipeline information of the pipeline network to be determined, and obtaining gas source point information and user node information based on the pipeline information; then calculating the path with minimum pressure loss based on the gas source point information and the user node information, in combination with the first shortest path algorithm; finally, based on the path with minimum pressure loss, obtaining the pressure loss and corresponding to each path with minimum pressure loss, and determining the first pressure point based on the pipeline information and multiple pressure loss sums, obtaining the lowest pressure point of the pipeline network; wherein the lowest pressure point of the pipeline network includes the first pressure point.

[0048] Its beneficial effects are as follows: the embodiment of the present invention calculates the path with minimum pressure loss based on the gas source point information and user node information of the pipeline network to be determined, combined with the first shortest path algorithm; and obtains the lowest pressure point of the pipeline network based on the path with minimum pressure loss and its corresponding pressure loss sum. The present invention only requires pipeline network information, gas source point information, user node information and the first shortest path algorithm to calculate the lowest pressure point of the pipeline network. It does not require the installation of a large number of pressure monitoring points in reality, nor does it require the calculation of the lowest pressure point based on the gas consumption of urban gas users. Therefore, the present invention can avoid the problem of low accuracy caused by determining the lowest pressure point based on pressure monitoring points and operating experience in the prior art, and can also avoid the problem of inaccurate calculation results caused by calculating the lowest pressure point based on the gas consumption of urban gas users in the prior art, thereby improving the accuracy of determining the lowest pressure point of the gas pipeline network.

[0049] In addition, after determining the lowest pressure point of the pipeline network, the embodiment of the present invention also optimizes the pipeline network according to the lowest pressure point of the pipeline network, which can clarify the direction of pipeline network optimization and scientifically formulate a pipeline network reconstruction plan.

[0050] Furthermore, the embodiments of the present invention can solve the problem of inefficiency in the prior art, which is caused by the need to install pressure monitoring points in reality or to calculate the minimum pressure point based on the gas consumption of urban gas users in order to determine the minimum pressure point of the pipeline network, thereby effectively improving the efficiency of determining the minimum pressure point of the gas pipeline network.

[0051] Finally, based on the lowest pressure point of the pipeline network determined by the embodiment of the present invention, the pressure monitoring points can be reasonably arranged so that the pipeline network can better match the gas demand of the end users; it can also scientifically and quickly analyze the transmission and distribution characteristics of the static pipeline network itself under the ever-changing operating conditions of the large-scale urban gas pipeline network, thereby improving the accuracy of the existing method for determining the lowest pressure point of the pipeline network. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a flow chart of a method for determining the lowest pressure point of a pipe network provided by an embodiment of the present invention;

[0053] Figure 2 It is a structural schematic diagram of a device for determining the lowest pressure point of a pipe network provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Reference Figure 1 , is a flow chart of a method for determining the lowest pressure point of a pipe network provided by an embodiment of the present invention, comprising:

[0056] S101: Obtain the pipeline network information of the pipeline network to be determined, and obtain the gas source point information and user node information according to the pipeline network information.

[0057] In this embodiment, the pipe network information of the pipe network to be determined is obtained as follows:

[0058] Acquire basic data of the pipe network, and establish a pipe network model based on the basic data;

[0059] A pipeline network topology map is obtained according to the pipeline network model, and after error correction is performed according to the pipeline network topology map, pipeline network information is generated and obtained.

[0060] Preferably, the pipeline network to be determined is a gas pipeline network.

[0061] The basic data of the pipeline network include: pipeline (equipment) location, pipeline diameter, pipeline wall thickness, valve switch status and other information. The basic data of the pipeline network comes from GIS system data, CAD design drawing data or other gas enterprise archives.

[0062] Furthermore, the intersection points of each pipe section in the pipe network obtained from the pipe network model are called nodes, and the pipe sections between each intersection point are called paths. Then the pipe network topology can be expressed by the following formula:

[0063] G = (V, E);

[0064] Wherein, V is the set of all nodes in the graph, denoted as V = {v1, v2, v3, ..., vi}; E is the set of all paths in the graph, denoted as E = {e1, e2, e3, ..., ej}; G is the pipe network topology. In fact, each path in the pipe network topology has a definite flow direction in a definite state, so the definite association relationship between E and V should be included in the above pipe network topology. However, in this embodiment, it is assumed that bidirectional flow is possible, so the flow direction is not listed in the formula.

[0065] In a specific embodiment, the error correction is performed according to the pipe network topology diagram, specifically:

[0066] When it is determined that there is missing pipeline information in the pipeline network topology map or that there are nodes that should be connected but are not connected during the pipeline entry process, the data of the pipeline network topology map is supplemented or modified in conjunction with the pipeline operating unit to complete the error correction. Among them, when the numerical information of the pipeline network topology map does not meet the standard numerical set, it is determined that there is missing pipeline information in the pipeline network topology map. Island detection is performed on the pipeline. When it is detected that a certain pipeline is not connected to other pipelines, it is determined that there are nodes that should be connected but are not connected during the pipeline entry process; endpoint coordinate tolerance detection is performed on the pipeline. When it is monitored that the distance between one endpoint of a pipeline and the endpoint of another pipeline is very close, which is less than the preset endpoint distance value, it is determined that there are nodes that should be connected but are not connected during the pipeline entry process.

[0067] S102: Calculate the path with minimum pressure loss based on the gas source point information and the user node information in combination with the first shortest path algorithm.

[0068] In this embodiment, the path with the minimum pressure loss is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically:

[0069] According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer;

[0070] Calculate and obtain the sum of pressure losses of a plurality of the first paths according to the first shortest path algorithm;

[0071] According to the sum of the pressure losses of the plurality of first paths, a path with minimum pressure loss between the N gas source points and each of the user nodes is obtained.

[0072] The first path with the minimum pressure loss is the path with the minimum pressure loss between the N gas source points and each user node.

[0073] Specifically, when N is equal to 1, it means that there is only a single gas source point in the pipeline network to be determined, and the first path is the path between the single gas source point to each user node; when N is not equal to 1, it means that there are multiple gas source points in the pipeline network to be determined, and the first path is the path between multiple gas source points to each user node.

[0074] Furthermore, when N is not equal to 1, it means that there are multiple gas source points in the pipeline network to be determined. When the pressures of multiple gas source points are inconsistent, it is assumed that the pressures of multiple gas sources are the same, and at the same time, a virtual pipe section is created at the gas source point with inconsistent pressures, and the path pressure loss value of the virtual pipe section is calculated, so as to consider the impact caused by the inconsistent pressures of multiple gas source points. This can be explained by the following specific case: Assuming that there are two gas source points, the first one is 0.3MPa and the second one is 0.25MPa, when calculating the shortest path to the user node on the second gas source point, 0.32-0.252 (i.e. the path pressure loss value of the virtual pipe section) should be added. Assuming there are three gas source points, the first one is 0.3MPa, the second one is 0.25MPa, and the third one is 0.2MPa, then when calculating the shortest distance path to the user node at the second gas source point, 0.32-0.252 (i.e., the path pressure loss value of the virtual pipe segment) should be added; when calculating the shortest distance path generation tree to the user node at the third gas source point, 0.32-0.22 (i.e., the path pressure loss value of the virtual pipe segment) should be added. Since the embodiment of the present invention assumes that the pressures of multiple gas source points are consistent, there is no need to consider the impact caused by the inconsistent pressures of multiple gas source points.

[0075] In a specific embodiment, the sum of the pressure losses of the plurality of first paths is calculated according to the first shortest path algorithm, specifically:

[0076] According to the Arit-Suri formula, the first calculation formula is simplified to obtain the second calculation formula; wherein the first calculation formula is used to calculate the friction resistance loss per unit length of the pipeline;

[0077] According to the preset conditions, the second calculation formula is simplified to obtain a path pressure loss calculation formula;

[0078] According to the path pressure loss calculation formula and the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated.

[0079] Specifically, the first calculation formula is as follows:

[0080]

[0081] Among them, P1 is the pressure at the starting point of the gas pipeline (absolute pressure, kPa); P2 is the pressure at the end point of the gas pipeline (absolute pressure, kPa); L is the calculated length of the gas pipeline (km); λ is the friction resistance coefficient of the gas pipeline; d is the inner diameter of the pipeline (mm); Q is the calculated flow rate of the gas pipeline (m3 / h); ρ is the density of the gas (kg / m3); T is the gas temperature used in the design (K); T0 is 273.15 (K); Z is the compression factor, when the gas pressure is less than 1.2MPa (gauge pressure), Z is 1.

[0082] The Aritisuri formula is as follows:

[0083]

[0084] Among them, λ is the friction coefficient of the gas pipeline; K is the equivalent absolute roughness of the inner surface of the pipe wall; Re is the Reynolds number.

[0085] Substituting the Arrit-Suri formula into the first calculation formula and simplifying the first calculation formula, the second calculation formula is obtained. The second calculation formula is as follows:

[0086]

[0087] Among them, P1 is the pressure at the starting point of the gas pipeline (absolute pressure, kPa); P2 is the pressure at the end point of the gas pipeline (absolute pressure, kPa); L is the calculated length of the gas pipeline (km); K is the equivalent absolute roughness of the inner surface of the pipe wall; d is the inner diameter of the pipeline (mm); v is the kinematic viscosity of the gas at 0℃ and 101.325kPa (m2 / s); Q is the calculated flow rate of the gas pipeline (m3 / h); ρ is the density of the gas (kg / m3); T is the gas temperature used in the design (K); T0 is 273.15 (K); Z is the compression factor, when the gas pressure is less than 1.2MPa (gauge pressure), Z is 1.

[0088] Furthermore, the preset conditions include: the relative roughness of the pipe wall is assumed to be zero; the temperature in the pipeline is assumed to be constant; and the flow rate in the pipeline is assumed to be constant.

[0089] The reason why the relative roughness of the pipe wall is assumed to be zero is that the roughness of the pipe wall reflects many factors, such as the pipe material, pipe manufacturing process, construction welding, quality of the transported gas, storage years and conditions of the pipe, etc. In fact, the values ​​are different in different pipe sections and are not zero. However, the present invention focuses on studying the characteristics of the pipe network topology structure itself, so the pipe is simplified to an ideal pipe and the roughness is assumed to be zero.

[0090] The temperature inside the pipeline is assumed to be a constant because: the buried depth of the pipeline is generally below 0.6m. According to existing research, the soil temperature below 0.5m does not fluctuate with the daily cycle of temperature fluctuations. In addition, the gas pipeline winds underground and fully realizes heat exchange. It can be assumed that the temperature changes little, so it is simplified to a constant.

[0091] The flow rate in the pipeline is assumed to be constant because: an ideal state is assumed. When a distribution path is taken as the object of investigation, the path is not affected by the flow rate of other pipeline networks and the flow rate on the path remains constant, thereby removing the impact of the flow rate on the pipeline network analysis. Another description of this assumption is the process of transporting a unit flow of gas from one node to another when all nodes in the pipeline network stop supplying gas.

[0092] According to the preset conditions, the second calculation formula is simplified to obtain a path pressure loss calculation formula. The path pressure loss calculation formula is as follows:

[0093]

[0094] Among them, C is a constant coefficient.

[0095] The shortest distance path refers to the path with the shortest sum of pipeline lengths (L) among different transmission and distribution paths from the gas source point to a specific gas consumption point (i.e., user node); the path with the minimum pressure loss refers to the path with the shortest sum of pressure loss (P1) among different transmission and distribution paths from the gas source point to a specific gas consumption point (i.e., user node). 2 -P2 2 ) is the path with the smallest sum.

[0096] Preferably, the first shortest path algorithm is a Dijkstra algorithm or other shortest path algorithms. The Dijkstra algorithm can be used to obtain a path spanning tree with minimum pressure loss from the gas source point to all user nodes, and a path spanning tree with minimum distance from the gas source point to all user nodes, thereby further obtaining a path with minimum pressure loss and a path with shortest distance.

[0097] S103: After obtaining the pressure loss sum corresponding to each minimum pressure loss path according to the minimum pressure loss path, determining the first pressure point according to the pipeline network information and multiple pressure loss sums, and obtaining the lowest pressure point of the pipeline network.

[0098] Wherein, the lowest pressure point of the pipeline network includes the first pressure point.

[0099] In this embodiment, it also includes:

[0100] According to the gas source point information and the user node information, and in combination with a first shortest path algorithm, a shortest distance path is calculated;

[0101] According to the shortest distance path, after obtaining the sum of the pipeline lengths corresponding to each of the shortest distance paths, after determining the second pressure point according to the pipeline network information and the sum of multiple pipeline lengths, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the second pressure point.

[0102] In a specific embodiment, the shortest path is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically:

[0103] According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer;

[0104] Calculate the sum of pipeline lengths of a plurality of the first paths according to the first shortest path algorithm;

[0105] According to the sum of the pipeline lengths of the plurality of first paths, the shortest path between the N gas source points and each of the user nodes is obtained.

[0106] The first path with the smallest length of each pipeline is the shortest path between the N gas source points and each user node.

[0107] Specifically, when N is equal to 1, it means that there is only a single gas source point in the pipeline network to be determined, and the first path is the path between the single gas source point to each user node; when N is not equal to 1, it means that there are multiple gas source points in the pipeline network to be determined, and the first path is the path between multiple gas source points to each user node.

[0108] Specifically, the lowest pressure point of the pipeline network is the lowest pressure point of the pipeline network to be determined, including the first pressure point and the second pressure point; the first pressure point is the most unfavorable point in the pipeline network topology structure considering the pipe diameter and pipe length; the second pressure point is the most unfavorable point in the pipeline network topology structure considering only the pipe length.

[0109] In this embodiment, it also includes:

[0110] The pipeline network to be determined is optimized according to the lowest pressure point of the pipeline network, specifically:

[0111] The first path with the shortest distance is used as a first preset condition to shorten the first path with the least pressure loss; wherein the first path with the least pressure loss is the path with the least pressure loss corresponding to the lowest pressure point of the pipe network;

[0112] The first shortest distance path is shortened with the straight-line distance as the second preset condition; wherein the first shortest distance path is the shortest distance path corresponding to the lowest pressure point of the pipe network;

[0113] Shorten the straight-line distance between the gas source point and the lowest pressure point of the pipeline network.

[0114] Specifically, the first path with the smallest pressure loss is shortened to make it close to the path with the shortest distance; and the first path with the shortest distance is shortened to make it close to the straight-line distance.

[0115] In this embodiment, the optimization of the pipeline network to be determined is performed according to the lowest pressure point of the pipeline network, and further includes:

[0116] When the number of user nodes is only one:

[0117] First, shorten the second path with the least pressure loss to make it close to the path with the shortest distance. Rationally transform the pipeline on the path with the shortest distance, enlarge the diameter of the pipeline where the bottleneck occurs; establish parallel pipelines to bypass the pipeline area where the bottleneck occurs. The second path with the least pressure loss is the path with the least pressure loss corresponding to a single user node.

[0118] Secondly, shorten the second shortest distance path to make it close to the straight line distance. Add a connecting pipe at the branch of the second shortest distance path pipeline to form a new ring pipe network structure, so that the pipe network path tends to the straight line direction. Among them, the second shortest distance path is the shortest distance path corresponding to a single user node.

[0119] Finally, shorten the straight-line distance between the gas source point and a single user node. Reasonably increase the gas source points (gas replenishment points), completely change the existing pipe network structure, and significantly reduce the shortest path of the entire pipe network.

[0120] In a specific embodiment, the pipeline network to be determined may be optimized according to the special user node, specifically as follows:

[0121] The third path with the shortest distance is shortened with the first preset condition as the path with the smallest pressure loss; wherein the third path with the smallest pressure loss is the path with the smallest pressure loss corresponding to the special user node;

[0122] shortening the third shortest path by taking the straight-line distance as the second preset condition; wherein the third shortest path is the shortest path corresponding to the special user node;

[0123] Shorten the straight-line distance between the gas source point and the special user node.

[0124] The special user node is a user node determined according to customer needs.

[0125] For further explanation of the determination device of the lowest pressure point of the pipe network, please refer to Figure 2 , Figure 2 It is a structural schematic diagram of a device for determining the lowest pressure point of a pipe network provided by an embodiment of the present invention, comprising: an acquisition module 201, a calculation module 202 and a determination module 203.

[0126] The acquisition module 201 is used to acquire the pipeline network information of the pipeline network to be determined, and obtain the gas source point information and the user node information according to the pipeline network information.

[0127] The calculation module 202 is used to calculate the path with minimum pressure loss according to the gas source point information and the user node information in combination with a first shortest path algorithm.

[0128] In this embodiment, the path with the minimum pressure loss is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically:

[0129] According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer;

[0130] Calculate and obtain the sum of pressure losses of a plurality of the first paths according to the first shortest path algorithm;

[0131] According to the sum of the pressure losses of the plurality of first paths, a path with minimum pressure loss between the N gas source points and each of the user nodes is obtained.

[0132] In a specific embodiment, the sum of the pressure losses of the plurality of first paths is calculated according to the first shortest path algorithm, specifically:

[0133] According to the Arrit-Suri formula, the first calculation formula is simplified to obtain the second calculation formula; wherein the first calculation formula is used to calculate the friction resistance loss per unit length of the pipeline;

[0134] According to the preset conditions, the second calculation formula is simplified to obtain a path pressure loss calculation formula;

[0135] According to the path pressure loss calculation formula and the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated.

[0136] The determination module 203 is used to obtain the pressure loss and corresponding to each path with minimum pressure loss according to the path with minimum pressure loss, and then determine the first pressure point according to the pipeline network information and multiple pressure loss sums to obtain the lowest pressure point of the pipeline network; wherein the lowest pressure point of the pipeline network includes the first pressure point.

[0137] In this embodiment, it also includes:

[0138] According to the gas source point information and the user node information, and in combination with a first shortest path algorithm, a shortest distance path is calculated;

[0139] According to the shortest distance path, after obtaining the sum of the pipeline lengths corresponding to each of the shortest distance paths, after determining the second pressure point according to the pipeline network information and the sum of multiple pipeline lengths, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the second pressure point.

[0140] The embodiment of the present invention first obtains the pipeline information of the pipeline to be determined through the acquisition module 201, and obtains the gas source point information and the user node information according to the pipeline information; then, the calculation module 202 calculates the path with minimum pressure loss according to the gas source point information and the user node information, and combines the first shortest path algorithm; finally, the determination module 203 obtains the pressure loss and corresponding to each path with minimum pressure loss according to the path with minimum pressure loss, and after determining the first pressure point according to the pipeline information and multiple pressure loss sums, the lowest pressure point of the pipeline network is obtained; wherein, the lowest pressure point of the pipeline network includes the first pressure point.

[0141] The embodiment of the present invention calculates the path with minimum pressure loss based on the gas source point information and user node information of the pipeline network to be determined, in combination with the first shortest path algorithm; and obtains the lowest pressure point of the pipeline network based on the path with minimum pressure loss and its corresponding pressure loss sum. The present invention only requires the pipeline network information, gas source point information, user node information and the first shortest path algorithm to calculate the lowest pressure point of the pipeline network. It does not require the installation of a large number of pressure monitoring points in reality, nor does it require the calculation of the lowest pressure point based on the gas consumption of urban gas users. Therefore, the present invention can avoid the problem of low accuracy caused by determining the lowest pressure point based on pressure monitoring points and operating experience in the prior art, and can also avoid the problem of inaccurate calculation results caused by calculating the lowest pressure point based on the gas consumption of urban gas users in the prior art, thereby improving the accuracy of determining the lowest pressure point of the gas pipeline network.

[0142] In addition, after determining the lowest pressure point of the pipeline network, the embodiment of the present invention also optimizes the pipeline network according to the lowest pressure point of the pipeline network, which can clarify the direction of pipeline network optimization and scientifically formulate a pipeline network reconstruction plan.

[0143] Furthermore, the embodiments of the present invention can solve the problem of inefficiency in the prior art, which is caused by the need to install pressure monitoring points in reality or to calculate the minimum pressure point based on the gas consumption of urban gas users in order to determine the minimum pressure point of the pipeline network, thereby effectively improving the efficiency of determining the minimum pressure point of the gas pipeline network.

[0144] Finally, based on the lowest pressure point of the pipeline network determined by the embodiment of the present invention, the pressure monitoring points can be reasonably arranged so that the pipeline network can better match the gas demand of the end users; it can also scientifically and quickly analyze the transmission and distribution characteristics of the static pipeline network itself under the ever-changing operating conditions of the large-scale urban gas pipeline network, thereby improving the accuracy of the existing method for determining the lowest pressure point of the pipeline network.

[0145] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for determining the lowest pressure point of a pipe network, characterized in that: include: Obtaining the pipeline network information of the pipeline network to be determined, and obtaining the gas source point information and the user node information according to the pipeline network information; According to the gas source point information and the user node information, and in combination with a first shortest path algorithm, a path with minimum pressure loss is calculated; According to the path with minimum pressure loss, after obtaining the pressure loss and corresponding to each path with minimum pressure loss, after determining the first pressure point according to the pipeline network information and multiple pressure loss sums, the lowest pressure point of the pipeline network is obtained; wherein, the lowest pressure point of the pipeline network includes the first pressure point.

2. A method for determining the lowest pressure point of a pipe network according to claim 1, characterized in that: The path with the minimum pressure loss is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically: According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer; Calculate and obtain the sum of pressure losses of a plurality of the first paths according to the first shortest path algorithm; According to the sum of the pressure losses of the plurality of first paths, a path with minimum pressure loss between the N gas source points and each of the user nodes is obtained.

3. A method for determining the lowest pressure point of a pipe network according to claim 2, characterized in that: The sum of the pressure losses of the plurality of first paths is calculated according to the first shortest path algorithm, specifically: According to the Arrit-Suri formula, the first calculation formula is simplified to obtain the second calculation formula; wherein the first calculation formula is used to calculate the friction resistance loss per unit length of the pipeline; According to the preset conditions, the second calculation formula is simplified to obtain a path pressure loss calculation formula; According to the path pressure loss calculation formula and the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated.

4. The method for determining the lowest pressure point of a pipe network according to claim 1, characterized in that: Also includes: According to the gas source point information and the user node information, and in combination with a first shortest path algorithm, a shortest distance path is calculated; According to the shortest distance path, after obtaining the sum of the pipeline lengths corresponding to each of the shortest distance paths, after determining the second pressure point according to the pipeline network information and the sum of multiple pipeline lengths, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the second pressure point.

5. A method for determining the lowest pressure point of a pipe network according to claim 4, characterized in that: Also includes: The pipeline network to be determined is optimized according to the lowest pressure point of the pipeline network, specifically: The first path with the shortest distance is used as a first preset condition to shorten the first path with the least pressure loss; wherein the first path with the least pressure loss is the path with the least pressure loss corresponding to the lowest pressure point of the pipe network; The first shortest distance path is shortened with the straight-line distance as the second preset condition; wherein the first shortest distance path is the shortest distance path corresponding to the lowest pressure point of the pipe network; Shorten the straight-line distance between the gas source point and the lowest pressure point of the pipeline network.

6. A method for determining the lowest pressure point of a pipe network according to claim 5, characterized in that: The obtaining of the pipe network information of the pipe network to be determined is specifically as follows: Acquire basic data of the pipe network, and establish a pipe network model based on the basic data; A pipeline network topology map is obtained according to the pipeline network model, and after error correction is performed according to the pipeline network topology map, pipeline network information is generated and obtained.

7. A device for determining the lowest pressure point of a pipe network, characterized in that: include: Acquisition module, calculation module and determination module; The acquisition module is used to acquire the pipe network information of the pipe network to be determined, and obtain the gas source point information and the user node information according to the pipe network information; The calculation module is used to calculate the path with minimum pressure loss according to the gas source point information and the user node information in combination with a first shortest path algorithm; The determination module is used to obtain the pressure loss and corresponding to each path with minimum pressure loss according to the path with minimum pressure loss, and then determine the first pressure point according to the pipeline network information and multiple pressure loss sums to obtain the lowest pressure point of the pipeline network; wherein the lowest pressure point of the pipeline network includes the first pressure point.

8. The device for determining the lowest pressure point of a pipe network according to claim 7, characterized in that: The path with the minimum pressure loss is calculated based on the gas source point information and the user node information in combination with the first shortest path algorithm, specifically: According to the gas source point information and the user node information, multiple first paths between N gas source points and each user node are calculated; wherein N is a positive integer; Calculate and obtain the sum of pressure losses of a plurality of the first paths according to the first shortest path algorithm; According to the sum of the pressure losses of the plurality of first paths, a path with minimum pressure loss between the N gas source points and each of the user nodes is obtained.

9. A device for determining the lowest pressure point of a pipe network according to claim 8, characterized in that: The sum of the pressure losses of the plurality of first paths is calculated according to the first shortest path algorithm, specifically: According to the Arrit-Suri formula, the first calculation formula is simplified to obtain the second calculation formula; wherein the first calculation formula is used to calculate the friction resistance loss per unit length of the pipeline; According to the preset conditions, the second calculation formula is simplified to obtain a path pressure loss calculation formula; According to the path pressure loss calculation formula and the first shortest path algorithm, the sum of the pressure losses of the plurality of first paths is calculated.

10. The device for determining the lowest pressure point of a pipe network according to claim 7, characterized in that: Also includes: According to the gas source point information and the user node information, and in combination with a first shortest path algorithm, a shortest distance path is calculated; According to the shortest distance path, after obtaining the sum of the pipeline lengths corresponding to each of the shortest distance paths, after determining the second pressure point according to the pipeline network information and the sum of multiple pipeline lengths, the lowest pressure point of the pipeline network is obtained; wherein the lowest pressure point of the pipeline network includes the second pressure point.

Images