Hydraulic balance debugging method for fluid pipe network

Abstract

Hydraulic balance of a fluid pipe network is very important for reliable and energy-saving operation of the fluid pipe network. The invention discloses a hydraulic balance debugging method for a fluid pipe network. According to the method, a main pipe and branch pipes are graded, and debugging is conducted upwards step by step from the branch pipe on the bottommost layer. When the parallel pipelines are debugged, firstly, the valves on the parallel pipelines are opened to the maximum, then the pipeline with the best hydraulic balance index in the parallel pipelines is adjusted by adjusting the flow adjusting equipment on the upper-level pipeline of the parallel pipelines, the hydraulic balance index of the pipeline meets the requirement, and the pressure difference delta P of the two ends of the parallel pipelines at the moment is recorded; then valves on other pipelines in the parallel pipelines are adjusted one by one, so that the hydraulic balance index of the pipelines meets the requirement, and the pressure difference delta P of the two ends of the parallel pipelines is kept unchanged by adjusting flow adjusting equipment on an upper-stage pipeline of the parallel pipelines during adjustment. The debugging speed is high, the hydraulic balance degree of the pipe network is high after debugging is completed, and resistance is small.

Description

Technical Field

[0001] The present invention relates to the technical fields of building energy conservation and industrial energy conservation, and particularly relates to a method for hydraulic balance debugging of a fluid pipe network. Background Art

[0002] Hydraulic balance of a fluid pipe network is very important for the operation of the fluid pipe network. If hydraulic balance cannot be achieved, some terminals will not meet the operation requirements. For example, in a hot water pipe network for winter heating, if hydraulic balance cannot be achieved, the temperature of some rooms will be relatively low and cannot meet the winter heating requirements.

[0003] In the prior art, the methods for hydraulic balance debugging of a fluid pipe network are divided into two categories: the calculation method and the step-by-step approximation method.

[0004] The calculation method is to establish a mathematical model for the entire fluid pipe network and determine the valve positions of each regulating valve and the frequencies of pumps or fans according to calculations. Since it is actually difficult to establish a mathematical model for the entire fluid pipe network, this method is not practical in actual applications.

[0005] Adjusting the flow rate of any terminal in a fluid pipe network will affect the flow rates of other terminals. Therefore, repeated adjustments are required to make all terminals reach a better hydraulic balance state. The step-by-step approximation method is to repeatedly adjust the fluid pipe network. Each adjustment makes the pipe network closer to hydraulic balance, and after multiple adjustments, the pipe network reaches a better hydraulic balance state.

[0006] Regarding the method for hydraulic balance debugging of a fluid pipe network, the prior art has three deficiencies:

[0007] (1) Repeated adjustments are required, which takes a long time. As the scale of the pipe network increases, the time spent increases exponentially;

[0008] (2) Due to the mutual influence of the adjustments of each terminal, it is difficult to make all terminals reach a very good hydraulic balance state at the same time;

[0009] (3) The pipe network resistance cannot be reduced. During the hydraulic balance debugging process, the hydraulic balance of each terminal is mainly considered, and how to reduce the pipe network resistance is not mainly considered. Even, the pipe network resistance is increased at the expense of achieving hydraulic balance. Therefore, the pipe network resistance is relatively large after hydraulic balance debugging. Summary of the Invention

[0010] (I) Technical Problems to be Solved

[0011] In order to solve the problems existing in the above background art, the present invention provides a method for hydraulic balance debugging of a fluid pipe network.

[0012] (II) Technical Solutions

[0013] The present invention provides a method for hydraulic balance commissioning of a fluid pipeline network, including the following three steps S1, S2, and S3:

[0014] S1: Classify and define the pipelines. The main pipeline is the pipeline of level 0, the branch pipelines of the main pipeline are the pipelines of level 1, the branch pipelines of the pipelines of level 1 are the pipelines of level 2, and so on. The maximum pipeline level is denoted as level n. If all the fluid flowing through pipeline A also flows through pipeline B, and only part of the fluid flowing through pipeline B flows through pipeline A, then pipeline A is called the lower-level pipeline of pipeline B, and pipeline B is called the upper-level pipeline of pipeline A;

[0015] S2: Adjust the hydraulic balance of the pipelines of level n, including the following two sub-steps S21 and S22:

[0016] S21: Group the pipelines of level n according to the parallel relationship. The pipelines with a parallel relationship are divided into one group, and the groups are numbered as n_1, n_2,..., n_m n ;

[0017] S22: Adopt the hydraulic balance commissioning method for parallel pipelines to adjust the hydraulic balance inside the groups numbered n_1, n_2,..., n_m n respectively;

[0018] S3: According to the method described in step S2, adjust the hydraulic balance of the pipelines of level n - 1, level n - 2,..., level 2, and level 1 in sequence.

[0019] Further, the hydraulic balance commissioning method for parallel pipelines includes the following steps:

[0020] S101: Open the valves on each pipeline of this group of parallel pipelines to the maximum;

[0021] S102: Calculate the hydraulic balance index of each pipeline;

[0022] S103: Find the pipeline with the best hydraulic balance index among each pipeline, denoted as pipeline C;

[0023] S104: Adjust the flow regulating device on the upper-level pipeline of this group of parallel pipelines to make the hydraulic balance index of pipeline C meet the requirements, and record the pressure difference ΔP at both ends of this group of parallel pipelines at this time;

[0024] S105: Conduct hydraulic balance adjustment on a pipeline other than pipeline C in this group of parallel pipelines, denoted as pipeline D. The method is as follows: Adjust the valve on pipeline D and the flow regulating device on the upper-level pipeline of this group of parallel pipelines simultaneously to make the hydraulic balance index of pipeline D meet the requirements and keep the pressure difference at both ends of this group of parallel pipelines as the ΔP;

[0025] S106: Adjust the hydraulic balance of the other pipelines in the group of parallel pipelines except pipelines C and D one by one according to the method described in step S105.

[0026] Further, the calculation of the hydraulic balance index of the pipeline follows the following principle: If all the fluid flowing through a pipeline flows through a single end device, the hydraulic balance index of this pipeline is the hydraulic balance index of this end device; If the fluid flowing through a pipeline flows through multiple parallel end devices, the hydraulic balance index of this pipeline is the optimal value of the hydraulic balance indexes of these multiple parallel end devices.

[0027] Further, the flow regulating device is a valve, a fan or a water pump.

[0028] (III) Beneficial effects

[0029] The present invention provides a method for debugging the hydraulic balance of a fluid pipeline network. This method classifies the main pipeline and each branch pipeline, and starts debugging from the bottommost branch pipeline level by level upwards. When debugging a parallel pipeline, first open the valve on the parallel pipeline to the maximum, and then adjust the pipeline with the best hydraulic balance degree index in the parallel pipeline by adjusting the flow regulating device on the upper-level pipeline of the parallel pipeline to make its hydraulic balance index meet the requirements, and record the pressure difference ΔP at both ends of the parallel pipeline at this time. Subsequently, adjust the valves on the other pipelines in the parallel pipeline one by one to make the hydraulic balance index of this pipeline meet the requirements, and while adjusting, keep the pressure difference ΔP at both ends of the parallel pipeline unchanged by adjusting the flow regulating device on the upper-level pipeline of the parallel pipeline.

[0030] The present invention has the following beneficial effects:

[0031] (1) Fast debugging speed

[0032] The present invention starts hydraulic balance debugging from the bottommost pipeline level by level upwards. Since the adjustment of the upper-level pipeline will not affect the hydraulic balance of the lower-level pipeline, after the adjustment of the upper-level pipeline is completed, it is not necessary to adjust the lower-level pipeline again.

[0033] For pipelines at the same level, the present invention groups them according to the parallel relationship. When debugging the hydraulic balance of a parallel pipeline, the pressure difference at both ends of the parallel pipeline always remains unchanged. It should be noted that the pressure differences at both ends of each branch of the parallel pipeline are the same, and this condition always holds during the operation process. Therefore, during this debugging process, the subsequent adjustments will not damage the previous adjustments, avoiding repeated adjustments.

[0034] In short, during the process of debugging the hydraulic balance of the fluid pipeline network by the present invention, the subsequent adjustments will not damage the previous adjustments. Without repeated adjustments, the hydraulic balance debugging of the entire fluid pipeline network can be completed, and the debugging speed is fast.

[0035] (2) High hydraulic balance degree after debugging

[0036] When debugging a single pipeline, it is easy to achieve a very high level of hydraulic balance for this pipeline, which can also be achieved in the prior art. However, in the prior art, when adjusting other pipelines, it will destroy the hydraulic balance of the pipelines that have been debugged before, which is the reason why it cannot achieve a high hydraulic balance degree. In the present invention, when debugging the hydraulic balance of parallel pipelines, the pressure difference at both ends of the parallel pipelines remains unchanged all the time. Therefore, the subsequent debugging will not destroy the hydraulic balance of the pipelines that have been debugged before, and thus a high hydraulic balance degree can be achieved.

[0037] (3) Small pipe network resistance after debugging

[0038] In the present invention, when debugging the hydraulic balance of parallel pipelines, all valves are initially kept fully open, and the hydraulic balance index of a certain pipeline is adjusted by adjusting the flow regulating device on the upper-level pipeline. Therefore, after debugging, one of the valves in the parallel pipelines is in the fully open state, that is, the state with the smallest resistance. In this way, after all debugging is completed, as many valves as possible can be kept fully open on the premise of ensuring hydraulic balance, so that the system is in the state of the smallest resistance. Description of the drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a flowchart of a method for debugging the hydraulic balance of a fluid pipe network provided in Embodiment 1 of the present invention.

[0041] Figure 2 It is a flowchart of a method for debugging the hydraulic balance of parallel pipelines described in Embodiment 1 of the present invention.

[0042] Figure 3 It is a schematic diagram of a fluid pipe network involved in Embodiment 2 of the present invention.

[0043] Figure 4 It is a flowchart of a method for debugging the hydraulic balance of a fluid pipe network provided in Embodiment 2 of the present invention. Detailed implementation manners

[0044] To better understand the present invention, the content of the present invention will be further clearly elaborated below in conjunction with embodiments. However, the protected content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. The present invention will be further described below with reference to the accompanying drawings.

[0045] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] Embodiment 1

[0047] As Figure 1 shown, a method for hydraulic balance debugging of a fluid pipeline network provided in this embodiment includes the following three steps S1, S2, and S3:

[0048] S1: Classify and define the pipelines. The main pipeline is the 0-level pipeline, the branch pipelines of the main pipeline are the 1-level pipelines, the branch pipelines of the 1-level pipelines are the 2-level pipelines, and so on. The maximum pipeline level is denoted as the n-level. If all the fluid flowing through pipeline A flows through pipeline B, and only part of the fluid flowing through pipeline B flows through pipeline A, then pipeline A is called the lower-level pipeline of pipeline B, and pipeline B is called the upper-level pipeline of pipeline A;

[0049] S2: Adjust the hydraulic balance of the n-level pipelines, including the following two sub-steps S21 and S22:

[0050] S21: Group each n-level pipeline according to the parallel relationship. The pipelines with a parallel relationship are divided into one group, and the groups are numbered n_1, n_2,..., n_m n ;

[0051] S22: Adopt the hydraulic balance debugging method for parallel pipelines to adjust the hydraulic balance inside the groups numbered n_1, n_2,..., n_m n respectively;

[0052] S3: According to the method described in step S2, adjust the hydraulic balance of the n - 1 level, n - 2 level,..., 2 level, and 1 level pipelines in sequence.

[0053] As Figure 2 shown, the hydraulic balance debugging method for the parallel pipelines includes the following steps:

[0054] S101: Open the valves on each pipeline of this group of parallel pipelines to the maximum;

[0055] S102: Calculate the hydraulic balance index of each pipeline;

[0056] S103: Find the pipeline with the best hydraulic balance index among each pipeline, denoted as pipeline C;

[0057] S104: Adjust the flow regulating device on the upper-level pipeline of this group of parallel pipelines to make the hydraulic balance index of pipeline C meet the requirements, and record the pressure difference ΔP at both ends of this group of parallel pipelines at this time;

[0058] S105: For a pipeline other than pipeline C in this group of parallel pipelines, denoted as pipeline D, perform hydraulic balance adjustment. The method is as follows: Adjust the valve on pipeline D and the flow regulating device on the upper-level pipeline of this group of parallel pipelines simultaneously to make the hydraulic balance index of pipeline D meet the requirements, and keep the pressure difference at both ends of this group of parallel pipelines as the said ΔP;

[0059] S106: Adjust the hydraulic balance of other pipelines except pipelines C and D in this group of parallel pipelines one by one according to the method described in step S105.

[0060] Furthermore, the calculation of the hydraulic balance index of the pipeline follows the following principle: If all the fluid flowing through a certain pipeline flows through one terminal device, the hydraulic balance index of this pipeline is the hydraulic balance index of this terminal device; If the fluid flowing through a certain pipeline flows through multiple parallel terminal devices, the hydraulic balance index of this pipeline is the best value of the hydraulic balance indexes of these multiple parallel terminal devices.

[0061] Furthermore, the flow regulating device is a valve, a fan or a water pump.

[0062] This embodiment has the following beneficial effects:

[0063] (1) Fast debugging speed

[0064] In this embodiment, the hydraulic balance debugging is carried out step by step from the bottommost pipeline upwards. Since the adjustment of the upper-level pipeline will not affect the hydraulic balance of the lower-level pipeline, after the adjustment of the upper-level pipeline is completed, it is not necessary to adjust the lower-level pipeline again.

[0065] For the pipelines at the same level, in this embodiment, they are grouped according to the parallel relationship. When performing hydraulic balance debugging on the parallel pipelines, the pressure difference at both ends of the parallel pipelines remains constant all the time. It should be noted that during the operation process, the pressure differences at both ends of each branch of the parallel pipelines are always the same. Therefore, during this debugging process, the subsequent adjustments will not damage the previous adjustments, avoiding repeated adjustments.

[0066] In summary, during the hydraulic balance debugging process of the fluid pipeline network in this embodiment, the subsequent adjustments will not damage the previous adjustments. The hydraulic balance debugging of the entire fluid pipeline network can be completed without repeated adjustments, and the debugging speed is fast.

[0067] (2) High hydraulic balance degree after debugging

[0068] When debugging a single pipeline, it is easy to achieve a very high level of hydraulic balance for this pipeline, which can also be achieved in the prior art. However, in the prior art, when adjusting other pipelines, it will damage the hydraulic balance of the pipelines that have been debugged previously, which is the reason why it cannot achieve a high hydraulic balance degree. In this embodiment, when performing hydraulic balance debugging on the parallel pipelines, the pressure difference at both ends of the parallel pipelines remains constant all the time. Therefore, the subsequent debugging will not damage the hydraulic balance of the pipelines that have been debugged previously, and thus a high hydraulic balance degree can be achieved.

[0069] (3) Small pipeline network resistance after debugging

[0070] In this embodiment, when performing hydraulic balance debugging on the parallel pipelines, initially all valves are kept fully open, and the hydraulic balance index of a certain pipeline is adjusted by adjusting the flow regulating device on the upper-level pipeline. Therefore, after the debugging is completed, one of the valves in the parallel pipelines is in the fully open state, that is, the state with the minimum resistance. In this way, after all the debugging is completed, as many valves as possible can be kept fully open on the premise of ensuring hydraulic balance, making the system in the state of minimum resistance.

[0071] Embodiment 2

[0072] This embodiment takes a specific fluid pipeline network as the debugging object to illustrate a method for hydraulic balance debugging of a fluid pipeline network provided by the present invention.

[0073] The fluid pipeline network involved in this embodiment is as Figure 3 shown.

[0074] As Figure 4 shown, this embodiment provides a method for hydraulic balance debugging of a fluid pipeline network for the Figure 3 shown fluid pipeline network, including the following three steps of S201, S202, and S203:

[0075] S201: Classify and define the pipelines. It includes the following:

[0076] (1) Specify that pipeline L0 is of level 0, pipelines L11, L12, and L13 are of level 1, pipelines L21, L22, L23, L24, L25, and L26 are of level 2, and the maximum pipeline level is 2.

[0077] (2) Define the superior-inferior relationship of pipelines. If all the fluid flowing through pipeline A also flows through pipeline B, and only part of the fluid flowing through pipeline B flows through pipeline A, then pipeline A is called the inferior pipeline of pipeline B, and pipeline B is called the superior pipeline of pipeline A. For example, pipelines L11 and L0 are the superior pipelines of pipeline L21, and both L11 and L21 are the inferior pipelines of L0.

[0078] S202: Adjust the hydraulic balance of the level-2 pipelines, which includes the following three sub-steps: S2021, S2022, and S2023.

[0079] S2021: Group the level-2 pipelines according to the parallel relationship. Pipelines L21, L22, and L23 are grouped as one group, numbered 2_1, and pipelines L24, L25, and L26 are grouped as one group, numbered 2_2.

[0080] S2022: Use the hydraulic balance debugging method for parallel pipelines to adjust the hydraulic balance inside the group numbered 2_1. The steps are as follows:

[0081] (1) Open valves V21, V22, and V23 to the maximum.

[0082] (2) Calculate the hydraulic balance indexes of the ends U21, U22, and U23, and find the best one among them. Assume that the hydraulic balance index of U21 is the best.

[0083] (3) Adjust V11, V0, or F0 to make the hydraulic balance index of U21 meet the requirements, and record the pressure difference between point A1 and point A2 at this time, denoted as ΔP. A ;

[0084] (4) Adjust V22 to make the hydraulic balance index of U22 meet the requirements. At the same time, adjust V11, V0, or F0 to keep the pressure difference between point A1 and point A2 at ΔP. A ;

[0085] (5) Adjust V23 to make the hydraulic balance index of U23 meet the requirements. At the same time, adjust V11, V0, or F0 to keep the pressure difference between point A1 and point A2 at ΔP. A ;

[0086] S2023: Use the same method as in step S2022 to adjust the hydraulic balance inside the group numbered 2_2.

[0087] S203: Adjust the hydraulic balance of the first-level pipelines, which includes the following two sub-steps of S2031 and S2032:

[0088] S2031: Group the first-level pipelines according to the parallel relationship. Pipelines L11, L12, and L13 are in one group, numbered 1_1;

[0089] S2032: Adopt the hydraulic balance debugging method for parallel pipelines to adjust the hydraulic balance inside the group numbered 1_1. The steps are as follows:

[0090] (1) Open valves V11, V12, and V13 to the maximum;

[0091] (2) Calculate the hydraulic balance indexes of the ends U21, U22, and U23, find the best one among them. Assume that the hydraulic balance index of U21 is the best;

[0092] (3) Calculate the hydraulic balance indexes of the ends U24, U25, and U26, find the best one among them. Assume that the hydraulic balance index of U25 is the best;

[0093] (4) Calculate the hydraulic balance index of the end U13, find the best one among the hydraulic balance indexes of U21, U25, and U13. Assume that the hydraulic balance index of U25 is the best;

[0094] (5) Adjust V0 or F0 to make the hydraulic balance index of U25 meet the requirements, and record the pressure difference between point C1 and point C2 at this time, denoted as ΔP C ;

[0095] (6) Adjust V11 to make the hydraulic balance index of U21 meet the requirements. At the same time, adjust V0 or F0 to keep the pressure difference between point C1 and point C2 as ΔP C ;

[0096] (7) Adjust V13 to make the hydraulic balance index of U13 meet the requirements. At the same time, adjust V0 or F0 to keep the pressure difference between point C1 and point C2 as ΔP C ;

[0097] So far, Figure 3 the hydraulic balance debugging of the fluid pipeline network shown is completed. In this embodiment, when performing the hydraulic balance debugging on the Figure 3 fluid pipeline network shown, the subsequent adjustments will not damage the previous adjustments, and the debugging speed is fast. After the debugging is completed, the hydraulic balance degree of the pipeline network is high and the resistance is small.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A hydraulic balance commissioning method for a fluid pipe network, characterized in that, It includes the following three steps: S1, S2, and S3: S1: Classify and define the pipelines. The main pipeline is the pipeline of level 0. The branch pipelines of the main pipeline are pipelines of level 1. The branch pipelines of the pipelines of level 1 are pipelines of level 2, and so on. The maximum pipeline level is denoted as level n. If all the fluid flowing through pipeline A also flows through pipeline B, while only part of the fluid flowing through pipeline B flows through pipeline A, then pipeline A is called the subordinate pipeline of pipeline B, and pipeline B is called the superior pipeline of pipeline A. S2: Adjust the hydraulic balance of the pipelines of level n, including the following two sub-steps: S21 and S22: S21: Group each n-level pipeline according to the parallel relationship. Pipelines with a parallel relationship are grouped into one group, and the groups are numbered as n_1, n_2, ..., n_m n ; S22: Adopt the hydraulic balance debugging method for parallel pipelines, and adjust the hydraulic balance inside the groups numbered n_1, n_2, ..., n_m respectively n ; S3: According to the method described in step S2, adjust the hydraulic balance of the pipelines of level n - 1, level n - 2,..., level 2, and level 1 in sequence.

2. The hydraulic balance commissioning method of a fluid pipe network according to claim 1, characterized in that The method for debugging the hydraulic balance of the parallel pipelines includes the following steps: S101: Open the valves on each pipeline of the group of parallel pipelines to the maximum. S102: Calculate the hydraulic balance indicators of each pipeline. S103: Find the pipeline with the best hydraulic balance indicator among each pipeline, denoted as pipeline C. S104: Adjust the flow regulating device on the superior pipeline of the group of parallel pipelines to make the hydraulic balance indicator of pipeline C meet the requirements, and record the pressure difference ΔP at both ends of the group of parallel pipelines at this time. S105: Perform hydraulic balance adjustment on a pipeline other than pipeline C in the group of parallel pipelines, denoted as pipeline D. The method is as follows: Adjust the valve on pipeline D and the flow regulating device on the superior pipeline of the group of parallel pipelines simultaneously to make the hydraulic balance indicator of pipeline D meet the requirements and keep the pressure difference at both ends of the group of parallel pipelines as the ΔP. S106: Adjust the hydraulic balance of the other pipelines in the group of parallel pipelines except pipelines C and D according to the method described in step S105 one by one.

3. A hydraulic balance commissioning method for a fluid pipe network according to claim 2, characterized in that, The calculation of the hydraulic balance indicator of the pipeline follows the following principle: If all the fluid flowing through a pipeline flows through a single terminal device, then the hydraulic balance indicator of this pipeline is the hydraulic balance indicator of this terminal device; if the fluid flowing through a pipeline flows through multiple parallel terminal devices, then the hydraulic balance indicator of this pipeline is the best value of the hydraulic balance indicators of these multiple parallel terminal devices.

4. A hydraulic balance commissioning method for a fluid pipe network according to claim 2, characterized in that, The flow regulating device is a valve, a fan, or a water pump.

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