A method, device and terminal for determining an actual line characteristic curve by experiment

Abstract

The present application belongs to the technical field of pipeline connection, and discloses a method, equipment and terminal for determining an actual pipeline characteristic curve through experiment, selecting a certain number of test points and determining the test range; after the data of all points are measured, a formula is derived, and the P1 point and K value of the pipeline quadratic curve are obtained according to the corresponding calculation formula by using the first and second points; the derived formula is verified through the flow of the third point. Three points or more than three points are determined on site, the test range is near each frequently operated working condition point, and the flow deviation is ±10% at the position. The program selects the current working condition point as the first point, selects the second point in the positive or negative direction of the first point, and the positive and negative directions are determined according to the process requirements and actual conditions on site; the third point is selected in the middle part between the first and second points, and after the data of all the three points are measured, the P1 point and K value of the pipeline quadratic curve are obtained according to the corresponding calculation formula by using the first and second points.

Description

Technical Field

[0001] This invention belongs to the field of pipeline connection technology, and in particular relates to a method, equipment and terminal for determining the characteristic curve of an actual pipeline through experiments. Background Technology

[0002] There are only two basic modes of interconnection between pipelines: series or parallel, such as... Figure 3 As shown. The results of connecting the same two pipes in parallel and in series are very different. Note that in both cases, the elevation of the outlets of the two pipes is different from the starting point. This causes the superposition of the quadratic curves of the pipe profiles to result in a curve that is no longer quadratic. For example... Figure 4 As shown, the series curves; Figure 5 As shown, this is a parallel curve. A parallel curve is no longer a pure quadratic curve; it's a multi-segment curve composed of two quadratic curves. In the field, the pipeline connection is even more complex, consisting of many quadratic curve segments forming a multi-segment curve. This situation arises because the outlet heights are inconsistent in parallel connections. The physical meaning of each curve refers to the relationship between pressure and flow rate at point a (when there is no water flowing out at the high outlet c, and the flow rate is 0), as viewed from point a. This relationship follows the function of the lower segment of the two curves. Once water flows out at point c, the relationship follows the function of the upper segment of the curve.

[0003] Based on the above explanation, the following conclusions can be drawn: 1) In the past, directly using the highest outlet position and any flow rate and pressure according to the formula P=P1+KQ) 2 1) The constructed pipeline resistance curve is unusable under complex pipeline conditions. 2) In process design, useless systems are rarely designed. That is to say, unless a fault occurs, a situation where the inlet cannot supply water will not be designed. Generally, it will not operate at the lower end of the multi-terminal curve, but only at the uppermost segment. This conclusion provides guidance when analyzing problems on site. 3) No matter how complex, the pipeline curve is still composed of multiple quadratic curves. It still has regularity, and its regularity can still be found and resolved.

[0004] Based on the above analysis, the problems and defects of the existing technology are as follows: the pipeline connection method in the field is more complex, and it is formed by many quadratic curves. The reason for this situation is that the outlet height is inconsistent in the case of parallel connection. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a method, equipment, and terminal for determining the actual pipeline characteristic curve through experiments.

[0006] This invention is implemented as follows: a method for experimentally determining the actual pipeline characteristic curve, wherein the method for experimentally determining the actual pipeline characteristic curve includes:

[0007] On-site testing involves selecting a certain number of test points and determining the testing range; based on the data from all the measured points, the formula is derived and verified.

[0008] Furthermore, the specific process of determining the actual pipeline characteristic curve through experiments is as follows:

[0009] Step 1: On-site testing, select a certain number of test points, and determine the scope of the test;

[0010] Step 2: Based on the data from all the measured points, derive the formula and use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve using the corresponding calculation formula.

[0011] Step 3: Verify the derived formula using the flow rate at point 3.

[0012] Furthermore, in step one, selecting a certain number of test points specifically means: determining three or more points on-site.

[0013] Furthermore, in step one, determining the test range specifically means that the test range is near each frequently operating point, at a location where the flow deviation is ±10%.

[0014] Furthermore, in step one, the specific process of selecting a certain number of test points and determining the test range for on-site testing is as follows:

[0015] The program selects the first working point of the current condition, and then selects the second point based on whether the first point is positive or negative. The choice of positive or negative is determined according to the process requirements and actual conditions on site.

[0016] Select a third point in the middle of the first and second points. After measuring the data of all three points, use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve according to the corresponding calculation formula.

[0017] Furthermore, in step two, the specific process of formula derivation is as follows:

[0018] By measuring the pressure parameters at two flow points, two quadratic equations are formed and solved simultaneously to obtain the resistance curve near the current operating condition.

[0019]

[0020] Where P′ is the pressure at the first point, in meters (m); and Q′ is the flow rate at the first point, in cubic meters (m³). 3 / h; P″—Pressure at the second point, in meters; Q″—Flow rate at the second point, in cubic meters per second. 3 / h; P1—Initial pressure of the curve, in meters; K—Pipe resistance coefficient;

[0021] Transform formula (1) into the formula P′=P1+KQ′. 2 The transformation yields P1 = P′ + KQ′ 2 (3); Substituting P1 into formula (2), we get

[0022]

[0023]

[0024] After calculating the value of K, P1 can be obtained by substituting it into formula (3). The formula for the pipeline resistance curve near the working condition can then be obtained.

[0025] P = P1 + KQ 2 (4);

[0026] Formula (4) is used to calculate the relationship between flow rate and pressure between the first point and the second point.

[0027] Furthermore, in step three, the process of verifying the derived formula using the flow rate at the third point is as follows:

[0028] Substituting the third point into the formula P = P1 + KQ 2 In the process, verify whether the formula is correct; in actual operation, only the flow rate of the third point is substituted, and the calculated pressure is compared with the measured pressure. If they are consistent, the formula is correct within the range; if they are inconsistent, it proves that there are more than two curve segments within the range. Then, reselect, reduce the range, and repeat until it is qualified.

[0029] Another object of the present invention is to provide a computer device comprising a memory and a processor, the memory storing a computer program, which, when executed by the processor, causes the processor to perform the following steps:

[0030] Step 1: On-site testing, select a certain number of test points, and determine the scope of the test;

[0031] Step 2: Based on the data from all the measured points, derive the formula and use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve using the corresponding calculation formula.

[0032] Step 3: Verify the derived formula using the flow rate at point 3.

[0033] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps:

[0034] Step 1: On-site testing, select a certain number of test points, and determine the scope of the test;

[0035] Step 2: Based on the data from all the measured points, derive the formula and use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve using the corresponding calculation formula.

[0036] Step 3: Verify the derived formula using the flow rate at point 3.

[0037] Another objective of this invention is to provide an information data processing terminal for implementing the method of determining the actual pipeline characteristic curve through experiments.

[0038] Based on the above technical solutions and the technical problems solved, please analyze the advantages and positive effects of the technical solution to be protected by this invention from the following aspects:

[0039] First, addressing the technical problems existing in the prior art and the difficulty in solving them, this paper closely analyzes, in conjunction with the technical solution to be protected by this invention and the results and data obtained during the research and development process, how the technical solution of this invention solves the technical problems, and the inventive technical effects brought about by solving these problems. The specific description is as follows:

[0040] In the regulation and control of water supply systems, the current operating flow rate and head are readily available. When system adjustments are needed, assuming the overall hydraulic resistance of the system remains constant, and the adjustment is purely from one parameter to another, even if we know the desired adjustment parameter (flow rate or head), we still need to know the other parameter (head or flow rate). Therefore, we require a predictive method.

[0041] Previously, it was all based on formulas

[0042] P = P1 + KQ 2

[0043] Simplify the entire system as a pipeline, and use the current operating flow rate (Q) and water pressure (P) to calculate the K value in the formula. Then, reverse the process, using the known flow rate or pressure to calculate the other parameter (pressure or flow rate) we want to know.

[0044] This method relies on a crucial assumption: that the actual situation must conform to the simplified model. In the background section, we used mathematical methods to demonstrate that most field situations do not meet this assumption.

[0045] Therefore, it is difficult to accurately calculate and predict the parameters of the system under adjustment.

[0046] The method described in this invention is specifically designed to solve this problem. It collects more parameters near the operating point and then solves them simultaneously to accurately calculate and predict the adjusted parameters.

[0047] Second, considering the technical solution as a whole or from a product perspective, the technical effects and advantages of the technical solution to be protected by this invention are specifically described as follows:

[0048] As part of a water supply artificial intelligence scheduling system, this method is necessary to achieve intelligent scheduling calculations for pump stations. It is essential to know the system's required flow rate and pressure. Generally, one of these parameters is known. At this point, we can use the method of this invention to accurately calculate the other parameter. This provides clear instructions to the pump station scheduling system, enabling the system to optimize and find the best, most energy-efficient scheduling method.

[0049] Third, as supplementary evidence of the inventive step of the claims of this invention, it is also reflected in the following important aspects:

[0050] Does the technical solution of this invention solve a technical problem that people have long desired to solve but have never been able to successfully address?

[0051] During system adjustment, it is required to accurately predict the changed parameters. That is, knowing one parameter (flow rate or head) to be adjusted to, we need to know the other parameter (head or flow rate). As mentioned earlier, currently, the entire system is simplified as a pipeline. The current operating flow rate (Q) and pressure (P) are substituted into a formula to calculate the K value. Then, the known flow rate or pressure is substituted into the formula to calculate the other parameter (pressure or flow rate). We have also proven that this method is inaccurate. This invention solves this problem. Attached Figure Description

[0052] Figure 1 This is a flowchart of a method for determining actual pipeline characteristic curves through experiments, provided in an embodiment of the present invention.

[0053] Figure 2 This is a schematic diagram of on-site testing provided in an embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the basic pattern of interconnected pipelines provided in the embodiments of the present invention;

[0055] Figure 4 This is a schematic diagram of the series curve provided in an embodiment of the present invention;

[0056] Figure 5 This is a schematic diagram of parallel curves provided in an embodiment of the present invention. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0058] like Figure 1 As shown, the method for determining the actual pipeline characteristic curve through experiments provided in this embodiment of the invention includes:

[0059] S101: On-site testing, select a certain number of test points, and determine the scope of the test.

[0060] S102: Based on the data of all the measured points, the formula is derived, and the P1 point and K value of the pipeline quadratic curve are obtained using the first and second points according to the corresponding calculation formula.

[0061] S103: Verify the derived formula by measuring the flow rate at the third point.

[0062] In S101 provided in this embodiment of the invention, the specific process of on-site testing, selecting a certain number of test points, and determining the test range is as follows: determine 3 or more points on-site, and the test range is near the frequently operating conditions, with a flow deviation of about ±10%.

[0063] The program selects the first working point of the current condition. The second point is selected based on whether the first point is positive or negative. The choice of positive or negative is determined according to the process requirements and actual conditions on site. For example, the flow rate of some systems cannot be lower, and the pump of some systems is limited by the motor power and cannot be higher.

[0064] Select a third point in the middle of the first and second points. After measuring the data of all three points, use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve according to the corresponding calculation formula.

[0065] In S102 provided by the embodiments of the present invention, the specific process of formula derivation is as follows:

[0066] By measuring the pressure parameters at two flow points, two quadratic equations are formed and solved simultaneously to obtain the resistance curve near the current operating condition.

[0067]

[0068] Where P′—pressure at the first point (m); Q′—flow rate at the first point (m³) 3 / h); P″—pressure at the second point (m); Q″—flow rate at the second point (m³ / h) 3 / h); P1—starting pressure of the curve (m); K—pipeline resistance coefficient.

[0069] Transform formula (1) into the formula P′=P1+KQ′. 2 The transformation yields P1 = P′ + KQ′ 2 (3); Substituting P1 into formula (2), we get

[0070]

[0071]

[0072] After calculating the value of K, P1 can be obtained by substituting it into formula (3). The formula for the pipeline resistance curve near this working condition is then obtained.

[0073] P = P1 + KQ 2 (4);

[0074] This formula can be used to calculate the relationship between flow rate and pressure between the first point and the second point.

[0075] In S103 of this embodiment of the invention, the specific process of verifying the derived formula through the flow rate at three points is as follows:

[0076] Substituting the third point into the formula P = P1 + KQ 2 In the process of verifying the formula, it is necessary to simply input the flow rate at the third point and compare the calculated pressure with the measured pressure. If they are consistent, the formula is correct within this range. If they are inconsistent, it proves that there are more than two curve segments within this range. The formula must be reselected and the range adjusted. This process is repeated until the formula is qualified.

[0077] It should be noted that embodiments of the present invention can be implemented in hardware, software, or a combination of both. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated-design hardware. Those skilled in the art will understand that the above-described devices and methods can be implemented using computer-executable instructions and / or included in processor control code, for example, such code provided on a carrier medium such as a disk, CD, or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuitry such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field-programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of the above-described hardware circuitry and software, such as firmware.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for experimentally determining the characteristic curve of an actual pipeline, characterized in that, The method for determining the actual pipeline characteristic curve through experiments includes: on-site testing, selecting a certain number of test points and determining the test range; deriving the formula based on the data from all the measured points, and verifying the formula. The specific process of determining the actual pipeline characteristic curve through experiments is as follows: Step 1: On-site testing, select a certain number of test points, and determine the scope of the test; Step 2: Based on the data from all the measured points, derive the formula and use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve using the corresponding calculation formula. Step 3: Verify the derived formula using the flow rate at point 3; In step one, selecting a certain number of test points specifically means: determining 3 or more points on-site; In step one, the scope of the test is specifically defined as follows: the test scope is near the frequently operating points, at locations where the flow deviation is ±10%. In step one, the on-site testing involves selecting a certain number of test points and determining the testing scope. The specific process is as follows: The program selects the first working point of the current condition, and then selects the second point based on whether the first point is positive or negative. The choice of positive or negative is determined according to the process requirements and actual conditions on site. Select a third point in the middle of the first and second points. After measuring the data of all three points, use the first and second points to calculate the P1 point and K value of the pipeline quadratic curve according to the corresponding calculation formula. In step two, the specific process of formula derivation is as follows: By measuring the pressure parameters at two flow points, two quadratic equations are formed and solved simultaneously to obtain the resistance curve near the current operating condition. Where P′ is the pressure at the first point, in meters (m); and Q′ is the flow rate at the first point, in cubic meters (m³). 3 / h; P″—Pressure at the second point, in meters; Q″—Flow rate at the second point, in cubic meters per second. 3 / h; P1—Initial pressure of the curve, in meters; K—Pipe resistance coefficient; Transform formula (1) into the formula P′=P1+KQ′. 2 The transformation yields P1 = P′ - KQ′ 2 (3); Substituting P1 into formula (2), we get After calculating the value of K, P1 can be obtained by substituting it into formula (3). The formula for the pipeline resistance curve near the working condition can then be obtained. P=P1+KQ 2 (4); Formula (4) is used to calculate the relationship between flow rate and pressure between the first point and the second point; In step three, the process of verifying the derived formula using the flow rate at the third point is as follows: Substituting the third point into the formula P = P1 + KQ 2 In the process, verify whether the formula is correct; in actual operation, only substitute the flow rate of the third point, and compare the calculated pressure with the measured pressure. If they are consistent, the formula is correct within the range; if they are inconsistent, it proves that there are more than two curve segments within the range. Then, reselect, reduce the range, and repeat until it is qualified.

2. A computer device, characterized in that, The computer device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the method for determining the actual pipeline characteristic curve by experiment as described in claim 1.

3. A computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the method for experimentally determining the actual pipeline characteristic curve as described in claim 1.

4. An information data processing terminal, characterized in that, The information data processing terminal is used to implement the method described in claim 1 for determining the actual pipeline characteristic curve through experiments.

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