A flow commissioning method and system for a ship cooling water system

Abstract

This invention discloses a method and system for flow rate adjustment in a ship's cooling water system. The flow rate adjustment method includes constructing a pipe network model of the ship's cooling water system, including various components such as pipes and valves within the model; setting data parameters for each component within the model, setting the valve resistance coefficient to the minimum, denoted as the first valve resistance coefficient; calculating a first flow rate value in each pipe segment based on the set data parameters and the first valve resistance coefficient; comparing the first flow rate value with a preset flow rate range to determine if it falls within the preset flow rate range; obtaining a second valve resistance coefficient for each valve based on the flow rate value within the preset flow rate range; and calculating the first valve opening based on the resistance coefficient-valve opening curve and the second valve resistance coefficient. This invention enables reasonable flow rate distribution in the cooling water system, achieving highly accurate flow rate adjustment and preventing insufficient or excessive cooling of mechanical equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship pipeline flow regulation, in particular to a flow debugging method and system for a ship cooling water system. BACKGROUND

[0002] The ship pipeline system is a collection of multiple pipe networks including fuel oil, lubricating oil, fire-fighting, cooling water, etc., and is an important part of the ship. Among them, the ship cooling water system provides cooling water for the whole ship, and takes away the excess heat generated in the operation process of related heat dissipation equipment, so as to ensure the normal operation of the equipment. The mechanical equipment that needs to be cooled in the system includes main and auxiliary diesel engines, lubricating oil coolers, fresh water coolers, bearings of shafting, air compressors, condensers, air conditioners, etc., among which the heat dissipation amount of the main engine is the largest. Therefore, the ship cooling water system often takes the cooling pipeline of the main engine as the center, and is composed of the cooling pipelines of other mechanical equipment and various cooling auxiliary equipment. The equipment is numerous and the pipe network is complex.

[0003] The amount of heat dissipation required by various equipment in the cooling water system often differs, so when determining the cooling water flow distribution, the consequences of insufficient cooling or excessive cooling should be fully considered. For example, taking the main engine as an example, insufficient cooling will cause the parts to be overheated, resulting in a decrease in the mechanical properties of the material, thermal stress and deformation, excessive wear and even damage due to seizure; on the contrary, excessive cooling will cause the cooling water to take away too much heat, thereby reducing the economy of the main engine; when using oil with a high sulfur content, excessive cooling will cause sulfuric acid to form in the cylinder and corrode the cylinder wall and piston. Therefore, the reasonable distribution of the flow of the cooling water system is very important.

[0004] At present, the existing public patents on pipeline system flow regulation mainly focus on the fields of water supply and drainage pipeline network, ventilation pipeline network, heating pipeline network, liquid cooling pipeline network, etc. For example, the invention patent CN102278598B provides a large pipeline network flow distribution test method, which calibrates the flow resistance characteristic curve of each ventilation branch of the pipeline network, sequentially releases the maximum flow resistance ventilation branch and the nearest branch, and gradually installs a flow limiting ring at each branch ventilation port to control the flow resistance of each branch to be the flow resistance under the design ventilation flow, thereby completing the distribution of the pipeline network flow.

[0005] There are few patents related to the flow distribution debugging of the ship cooling water system in the current patent. The valve of the ship cooling water system usually has only two states of opening and closing. When the opening and closing states of the valve cannot meet the flow requirements of the pipe network system in the running state, a throttle orifice plate is generally used to adjust the pressure. At the same time, a throttle orifice plate device needs to be installed in part of the heat exchange equipment to avoid excessive flow in the equipment. Moreover, some parameters in the project cannot be known or cannot be accurately known, and need to be estimated. In the on-site debugging process, due to the complexity of the pipe network, the large number of equipment and valves, and the unknown corresponding relationship between the valve opening and the resistance coefficient, the throttle orifice plate is easily prepared unreasonably. After the throttle orifice plate is installed, its structure is fixed, and the orifice diameter can only be adjusted by continuously replacing the throttle orifice plate or modifying the structure of the orifice plate on site to achieve the actual required pipe flow. The adjustment process is difficult and time-consuming, and often causes the throttle orifice plate to be scrapped due to improper orifice diameter adjustment, resulting in a huge waste of labor and materials, so a high-precision distribution optimization method for the ship cooling water is urgently needed to debug the flow in the pipe network design stage. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a flow debugging method and system for a ship cooling water system to realize the reasonable distribution of the flow of the cooling water system and realize high-accuracy flow debugging to avoid causing insufficient or excessive cooling of mechanical equipment.

[0007] In order to achieve the above-mentioned purpose and other related purposes, the present application provides a flow debugging method for a ship cooling water system, comprising:

[0008] S1: constructing a pipe network model of the ship cooling water system, the pipe network model comprising a plurality of components, the plurality of components comprising a pipeline and a valve;

[0009] S2: setting data parameters and fluid parameters of each component in the pipe network model, and setting the resistance coefficient of the valve to be the minimum, at which time the resistance coefficient corresponding to the valve is a first valve resistance coefficient;

[0010] S3: calculating a first flow value in each pipeline according to the set value of the data parameter and the first valve resistance coefficient;

[0011] S4: comparing the first flow value with a preset flow range to determine whether the first flow value is within the preset flow range, and obtaining a second valve resistance coefficient of each valve according to the flow value within the preset flow range;

[0012] S5: calculating to obtain a first valve opening according to the resistance coefficient-valve opening curve and the second valve resistance coefficient.

[0013] Optionally, in the step of determining whether the first flow value is within the preset flow range, comprising:

[0014] When the first flow value is in the preset flow range, the first valve resistance coefficient is the second valve resistance coefficient;

[0015] When the second flow value is not in the preset flow range, the flow values of the pipelines are set in the preset flow range, the flow values set in the preset flow range are defined as the second flow values, and the second valve resistance coefficients of each valve are trial calculated according to the second flow values.

[0016] Optionally, in the step of trial calculating the second valve resistance coefficients of each valve according to the second flow values, the step further comprises:

[0017] If the trial calculation is successful, the resistance coefficients of each valve for which the trial calculation is successful are the second valve resistance coefficients of each valve obtained;

[0018] If the trial calculation fails, the pipeline system of the pipe network model needs to be adjusted, and the steps S1-S4 are repeated until the second valve resistance coefficients of each valve are obtained.

[0019] Optionally, after the first valve opening is calculated and obtained, the method further comprises:

[0020] S6: The first valve opening is applied to the actual ship pipeline system to obtain flow values in the actual ship pipeline system, which are recorded as third flow values;

[0021] S7: An error value between the third flow values and the model flow values corresponding to the first valve opening is calculated, and whether to execute the first valve opening or to determine a final valve execution opening is determined according to the size of the error value.

[0022] Optionally, in the step of determining whether to execute the first valve opening or to determine the final valve execution opening according to the size of the error value, the step further comprises:

[0023] When the error value is in the error range, the first valve opening is the final execution valve opening;

[0024] When the error value is not in the error range, the data parameters of the pipelines, valves and other components in the pipe network model are corrected, and the steps S1-S7 are re-executed until the error value is in the error range, a second valve opening is obtained, and the second valve opening is taken as the final execution valve opening.

[0025] Optionally, after the step of determining whether to execute the first valve opening or to determine the final valve execution opening according to the size of the error value, the method further comprises:

[0026] The final execution valve opening is executed in the actual ship pipeline system, and an actual resistance coefficient is obtained and recorded as a third valve resistance coefficient;

[0027] According to the final execution valve opening and the third valve resistance coefficient, the resistance coefficient-valve opening curve is corrected.

[0028] Optionally, in the step of obtaining the third valve resistance coefficient, the step comprises:

[0029] The third valve resistance coefficient is calculated by a differential pressure reading of a pressure sensor arranged in the actual ship pipeline system.

[0030] Optionally, in the step of executing the final execution valve opening and obtaining the third valve resistance coefficient in the actual ship pipeline system, the step comprises:

[0031] According to the third valve resistance coefficient and the first valve resistance coefficient, the resistance coefficient of the orifice plate is calculated.

[0032] According to the resistance coefficient of the orifice plate, the aperture parameter of the orifice plate is calculated.

[0033] According to the aperture parameter of the orifice plate, the final execution valve opening is executed.

[0034] Optionally, after the resistance coefficient-valve opening curve is corrected, the method further comprises:

[0035] According to the corrected resistance coefficient-valve opening curve, the fourth valve resistance coefficient of each valve corresponding to the valve opening is calculated.

[0036] According to the fourth valve resistance coefficient and the first valve resistance coefficient, the resistance coefficient of the orifice plate is calculated.

[0037] According to the resistance coefficient of the orifice plate, the aperture parameter of the orifice plate is calculated.

[0038] According to the aperture parameter of the orifice plate, the aperture of the orifice plate in the actual ship pipeline system is verified and corrected.

[0039] The application further provides a flow commissioning system, comprising:

[0040] A pipeline network model construction module is configured to construct a pipeline network model according to an actual ship pipeline system.

[0041] A data parameter setting module is configured to set data parameters of various components in the pipeline network model, and set the resistance coefficient of the valve as the minimum, so that the resistance coefficient of the valve is the first valve resistance coefficient.

[0042] A flow calculation module is configured to calculate a first flow value in each pipeline according to the data parameters and the first valve resistance coefficient.

[0043] The flow comparison judgment module is configured to compare the first flow value with a preset flow range, and judge whether the first flow value is within the preset flow range, and obtain the second resistance coefficient of each valve according to the flow value within the preset flow range.

[0044] The valve opening calculation module is configured to calculate and obtain the first valve opening according to the resistance coefficient-valve opening curve and the second valve resistance coefficient.

[0045] Optionally, the flow comparison judgment module further comprises:

[0046] The comparison judgment module is configured to judge whether the first flow value is within the preset flow range, and when the first flow value is within the preset flow range, the first valve resistance coefficient is judged as the second valve resistance coefficient.

[0047] The trial calculation module is configured to set the flow values of the pipelines within the preset flow range when the comparison judgment module judges that the first flow value is not within the preset flow range, define the flow values within the preset flow range as second flow values, and trial the second valve resistance coefficient of each valve according to the second flow values.

[0048] Optionally, the flow debugging system further comprises:

[0049] The error calculation and judgment module is configured to calculate the error between a third flow value obtained when the first valve opening is applied to the actual ship pipeline system and a flow value corresponding to the execution of the first valve opening, and judge whether to execute the first valve opening or determine a final execution valve opening according to the size of the error value.

[0050] Optionally, the flow debugging system further comprises:

[0051] The resistance coefficient-valve opening curve correction module is configured to correct the resistance coefficient-valve opening curve according to a third valve resistance coefficient obtained when the final execution valve opening is executed in the actual ship pipeline system and the final execution valve opening.

[0052] The orifice plate aperture parameter calculation module is configured to calculate a fourth valve resistance coefficient according to the corrected resistance coefficient-valve opening curve correction module, calculate the resistance coefficient of the orifice plate according to the fourth valve resistance coefficient and the first valve resistance coefficient, and further calculate the aperture parameter of the orifice plate according to the resistance coefficient of the orifice plate.

[0053] Compared with the prior art, the flow debugging method and system for a ship cooling water system have at least the following beneficial effects:

[0054] The flow debugging method comprises the following steps: constructing a pipe network model of a ship cooling water system, wherein a plurality of components in the pipe network model comprise pipes and valves; setting data parameters of each component in the pipe network model, setting a resistance coefficient of the valve as a minimum, and recording the resistance coefficient as a first valve resistance coefficient; calculating a first flow value in each pipe according to the set values of the data parameters and the first valve resistance coefficient; comparing the first flow value with a preset flow range, judging whether the first flow value is within the preset flow range, and obtaining a second valve resistance coefficient of each valve according to the flow value within the preset flow range; and calculating a first valve opening degree according to a resistance coefficient-valve opening degree curve and the second valve resistance coefficient. The flow debugging method has high accuracy in flow debugging through cooling water pipe network model simulation, reasonably configures throttle orifice plates, meets the cooling water flow demand of pipes leading to various devices, avoids insufficient or excessive cooling of mechanical equipment, guarantees the operation temperature requirements of all devices, and provides a strong guarantee for shortening the cooling water system debugging time.

[0055] The flow debugging system is used for the flow debugging method and has the same technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 A flow chart of the flow debugging method for the ship cooling water system in the embodiment of the present application;

[0057] Figure 2 A simulation diagram of the ship cooling water system in the embodiment of the present application;

[0058] Figure 3 An operation step diagram of the flow debugging method for the ship cooling water system in the embodiment of the present application;

[0059] Figure 4a A flow resistance coefficient-valve opening degree curve diagram of a valve without valve opening degree indication in the embodiment of the present application;

[0060] Figure 4b A flow resistance coefficient-valve opening degree curve diagram of a valve with valve opening degree indication in the embodiment of the present application;

[0061] Figure 5 A structure schematic diagram of a throttle orifice plate in the embodiment of the present application;

[0062] Figure 6 A schematic diagram of the flow debugging system for the ship cooling water system in the embodiment of the present application.

[0063] LIST OF REFERENCE NUMERALS

[0064] 1 pipe

[0065] 2 throttle orifice plate

[0066] 3 orifice plate hole DETAILED DESCRIPTION

[0067] The present application is herein described, by way of example only, with reference to certain embodiments thereof. It is to be understood that there is no intention, one to limit the application to the specific embodiments, but on the contrary, that the intent is to cover all modifications, alternatives, and equivalents falling within the spirit and scope of the application, as defined by the appended claims. Specific structural and functional details disclosed herein are not to be interpreted as limiting but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to various embodiments.

[0068] It should be noted that the drawings included in the present disclosure are included to illustrate potentially relevant aspects of the present application and are not meant to be limiting in scope, as some aspects of the application can be implemented in a variety of ways outside the present drawings. Furthermore, to the extent that some of the figures can not depict true to scale, the figures are meant only to depict the objects and their relationships to one another as understood by the skilled artisan, and are not necessarily drawn to scale. Like reference numerals can be used to denote like objects throughout the disclosure.

[0069] The present embodiment provides a flow commissioning method for a ship cooling water system, referring to Figure 1 , the flow commissioning method comprises the following steps:

[0070] S1: constructing a pipe network model of the ship cooling water system, the pipe network model comprising a plurality of components, the plurality of components comprising pipes and valves;

[0071] Specifically, the pipe network model of the ship cooling water system is constructed, and in the present embodiment, the constructed pipe network model is as shown in Figure 2 . The pipe network model comprises a plurality of components, and the main components include various pipes, pipe accessories (valves, tees, elbows, reducers, etc.), and various equipment. At the same time, the boundary conditions of the pipe network need to be obtained and set synchronously, and the boundary conditions mainly refer to pressure boundary or velocity boundary.

[0072] S2: setting data parameters of each component in the pipe network model, and setting the resistance coefficient of the valve to be the minimum, at this time the resistance coefficient corresponding to the valve is the first valve resistance coefficient;

[0073] Specifically, referring to Figure 3The parameters of each component and fluid parameter in the pipe network model are set, mainly including pipe, pipe accessory parameter, equipment inlet and outlet parameter, pump performance curve, and pipe fluid parameter (density, temperature, and pressure) etc.

[0074] Referring to Figure 3 All valves in the pipe network model are set to be fully open state, so that the resistance coefficient of each valve is minimum, and the minimum valve resistance coefficient is recorded as the first valve resistance coefficient. The specific value can be obtained by program or from Table 1.

[0075] Table 1 Minimum valve resistance coefficient of stop valve, check valve and gate valve

[0076]

[0077] The minimum resistance coefficient of the butterfly valve can be calculated. The calculation method of the minimum resistance coefficient of the butterfly valve is shown in formula (1):

[0078]

[0079] In formula (1):

[0080] ξ - minimum resistance coefficient of butterfly valve;

[0081] g - gravitational acceleration (9.81 m / s 2 );

[0082] P2 - local resistance loss pressure head (Pa);

[0083] V - flow rate (m / s).

[0084] S3: According to the set value of the data parameter and the first valve resistance coefficient, the first flow value in each pipe is calculated;

[0085] According to S1 and step S2, the data parameters of each component and the first valve resistance coefficient are obtained, wherein the data parameters of each component include pump parameters (characteristic curve fitting), pipe diameter, pipe roughness, and inlet and outlet boundary parameters. The valve is set to be fully open state, and the Applied Flow Technology, Flomaster, or self-developed simulation software is used for iterative solution to obtain the flow Q of each pipe, which is recorded as the first flow value.

[0086] S4: The first flow value is compared with the preset flow range to determine whether the first flow value is within the preset flow range, and the second valve resistance coefficient of each valve is obtained according to the flow value within the preset flow range;

[0087] The first flow rate value is compared with a preset flow rate range to determine whether the first flow rate value falls within the preset flow rate range. In this embodiment, reference is made to... Figure 3 The preset flow rate range is between 2Q. req >Q>1.2Q req Where Q is the actual flow rate, Q req This represents the traffic demand value.

[0088] When determining whether the first flow rate value is within the preset flow rate range, if the first flow rate value is within the preset flow rate range, the first valve resistance coefficient can be used as the second valve resistance coefficient. If the first flow rate value is not within the preset flow rate range, the flow rate value of each pipeline is set within the preset flow rate range, and the flow rate value set within the preset flow rate range is defined as the second flow rate value. The second valve resistance coefficient of each valve is calculated based on the second flow rate value. If the calculation is successful, the resistance coefficient of each valve that is successfully calculated is the obtained second valve resistance coefficient of each valve. If the calculation fails, the pipeline system of the pipeline network model needs to be adjusted, and steps S1 to S5 are repeated until the second valve resistance coefficient of each valve is obtained. Specifically, the resistance coefficient of each pipeline valve is set as the independent variable, with its minimum value being the resistance coefficient when the valve is fully open and its maximum value being set to 80. The flow rate of each pipeline segment (i.e., the target variable) is set to 2Q. req >Q>1.2Q req Then, the resistance coefficient of each valve is calculated. If the valve adjustment is successful (i.e., the resistance coefficient of each pipeline is successfully calculated), the corresponding valve resistance coefficient is recorded as the second valve resistance coefficient. When the valve adjustment fails (the calculation fails), the pipeline system needs to be adjusted, including but not limited to adjusting the corresponding pipe diameter, adjusting the pipeline route, and replacing accessories such as pumps. Furthermore, existing commercial software can be used for trial calculations. When the flow rate Q in the pipeline exceeds 2Q... req When this happens, the opening of one or more valves needs to be reduced, and the Q value needs to be recalculated through trial and error or iteration. The goal is to obtain Q values ​​that are 1.2-2 times the required Q value. req If the flow rate does not reach the preset flow range regardless of the valve opening adjustment, then the pipeline system needs to be adjusted, and steps S1 to S5 need to be repeated until the flow rate Q reaches the preset flow range, thereby obtaining the second valve resistance coefficient for each valve.

[0089] S5: Obtain the first valve opening based on the resistance coefficient-valve opening curve.

[0090] In step S4, the second valve resistance coefficient of each valve is obtained, and the first valve opening is obtained according to the existing resistance coefficient-valve opening curve. If the corresponding valve opening cannot be found through the curve, the corresponding pipeline needs to be adjusted. Specifically, the pipeline system adjustment includes but is not limited to corresponding pipe diameter adjustment, pipeline trend adjustment, and replacement of accessories such as pumps and other equipment, and then step S1 is repeated.

[0091] S6: Apply the first valve opening to the actual ship pipeline system to obtain the flow value in the actual ship pipeline system, denoted as the third flow value;

[0092] Referring to Figure 3 , according to the first valve opening output execution, the field valve opening is adjusted. When the field valve has an opening indication, the valve opening (0-100% opening) output by the simulation calculation is adjusted. When there is no opening indication, in order to facilitate field operation, debugging guidance for 1 / 4 opening, 1 / 2 opening, 3 / 4 opening, and full opening can be performed. In the field debugging process of the present embodiment, the orifice diameter of the throttle orifice plate is used to equivalent the valve opening in the simulation pipeline model. Further, in the process of executing the first valve opening or other valve openings, the orifice diameter parameter of the throttle orifice plate under the valve opening can be calculated through the corresponding relationship between the valve resistance coefficient corresponding to the valve opening and the throttle orifice plate resistance coefficient, to realize the execution of the first valve opening or other valve openings.

[0093] The one-dimensional pipeline local resistance calculation method is shown in formula (2):

[0094] ξ a = ξ + ξ orifice (2)

[0095] In formula (2):

[0096] ξ a —Valve resistance coefficient with opening, a is valve opening: 0-100% opening (or: 1 / 4 opening, 1 / 2 opening, 3 / 4 opening, and full opening);

[0097] ξ—Valve resistance coefficient when fully open;

[0098] ξ orifice —Corresponding throttle orifice plate resistance coefficient.

[0099] According to the fourth valve resistance coefficient, the corresponding throttle orifice plate resistance coefficient in the pipeline is obtained, so as to calculate and output the throttle orifice plate orifice diameter parameter. Limited to the length, only the throttle orifice plate with an angle is used as an example here, and its structure is shown in Figure 5 Figure 5 ​, the orifice plate 2 is arranged in the pipeline 1, the orifice plate 2 is provided with orifice plate holes 3, the relationship between the orifice plate resistance coefficient and parameters is shown as formula (3):

[0100]

[0101] In formula (3):

[0102] ξ orifice Resistance coefficient;

[0103] A up Upstream pipeline cross-sectional area of the orifice plate;

[0104] A down Downstream pipeline cross-sectional area of the orifice plate;

[0105] A orifice Orifice plate hole area.

[0106] Wherein, A up and A down are known parameters.

[0107] It should be noted that the orifice plate also includes various types such as upstream and downstream area change, smooth transition, etc., and the corresponding formula is used for solving.

[0108] Referring to Figure 3 , after the valve opening adjustment is completed, the real flow value Q r of the corresponding pipe section is read and recorded, and the real flow value Q r is recorded as a third flow value.

[0109] S7: Calculate the error value between the third flow value and the model flow value corresponding to the first valve opening, and determine whether to execute the first valve opening according to the size of the error value.

[0110] Referring to Figure 3 , the error value between the third flow value Q r and the model flow value corresponding to the first valve opening is calculated.

[0111] In this embodiment, it is determined whether the error range is satisfied, wherein Q is the flow value corresponding to the pipe network model when the first valve opening is executed, that is, the first flow value or the second flow value; Q r is the third flow value read in the actual ship pipeline system.

[0112] Determine whether to execute the first valve opening according to the size of the error value. Referring to Figure 3When the error value is within the error range, the first valve opening is executed as the final valve opening, and data that meets the error range is entered into step ② for error analysis. When the error value is outside the error range, the data parameters of pipelines, valves, and other components in the pipeline network model are corrected, and steps S1 to S7 are re-executed until the error value is within the error range. The second valve opening is then obtained and used as the final valve opening. Data that does not meet the error range is entered into step ① for error analysis. The equipment parameters and fluid parameters in the calculation model are then corrected to obtain a new calculation model.

[0113] In an optional embodiment of this example, after step S7, a step of correcting the resistance coefficient-valve opening curve is further included. This step includes: executing the final valve opening in the actual ship piping system and obtaining the actual resistance coefficient, which is recorded as the third valve resistance coefficient. The resistance coefficient-valve opening curve is corrected based on the final valve opening and the third valve resistance coefficient. The third valve resistance coefficient is calculated using the differential pressure reading ΔP from the pressure sensor installed in the actual ship piping system. This further corrects and optimizes the relationship curve between valve opening and flow resistance coefficient, such as... Figure 4a Or as shown in 4b. It should be noted that... Figure 4a and Figure 4b The flow resistance coefficient and drag coefficient are the same concept; to avoid misunderstanding, this clarification is provided here. This can be determined according to the formula... The resistance coefficient of the third valve is solved. In the formula, ΔP is the pressure sensor reading, ρ is the fluid density, v is the flow velocity, and ξ is the resistance coefficient.

[0114] Optionally, after correcting the resistance coefficient-valve opening curve, the process also includes correcting the orifice plate parameters in the actual ship piping system. This step includes: calculating the fourth valve resistance coefficient for each valve at its corresponding valve opening using the corrected resistance coefficient-valve opening curve; calculating the orifice plate resistance coefficient based on the fourth valve resistance coefficient and the first valve resistance coefficient; calculating the orifice plate diameter parameters based on the orifice plate resistance coefficient; and verifying and correcting the orifice plate diameter in the actual ship piping system based on the orifice plate diameter parameters.

[0115] Specifically, refer to Figure 3 The resistance coefficient of each valve at its corresponding valve opening degree is solved using the corrected curve to obtain the resistance coefficient of the fourth valve. The parameters of the orifice plate are then calculated and verified using the fourth valve resistance coefficient. The orifice diameter parameters of the orifice plate are solved using the above formulas (2) and (3). After on-site commissioning, the orifice diameter parameters of the orifice plate are verified and corrected.

[0116] The above data is data-entered ③, and error analysis is performed in combination with data-entering ① and data-entering ②. After long-term operation of the system, data such as Tables 2-4 can be obtained.

[0117] Table 2 Effective output confidence

[0118] Error interval ≤2％ ≤5％ ≤8％ ≤20％ Confidence X1 X2 X3 X4

[0119] Note: X1 = (number of times of error values ≤ 2%) / (number of times of error values ≤ 20%);

[0120] X2 = (number of times of error values ≤ 5%) / (number of times of error values ≤ 20%);

[0121] X3 = (number of times of error values ≤ 8%) / (number of times of error values ≤ 20%);

[0122] X4 = (number of times of error values ≤ 20%) / (number of times of error values ≤ 20%), X4 = 100%.

[0123] Table 3 Flow calculation result output statistics

[0124] Output result Valid (< 20%) Invalid (> 20%) Proportion X5 X6

[0125] Note: X5 = effective number of times / (effective number of times + invalid number of times);

[0126] X6 = invalid number of times / (effective number of times + invalid number of times);

[0127] When , it is judged to be effective, and when , it is judged to be invalid.

[0128] Table 4 Orifice calculation result output statistics

[0129] Output result ≤20％ ＞20％ Proportion X7 X8

[0130] Note: X7 = number of times of error values ≤ 20% / total number of times;

[0131] X8 = number of times of error values > 20% / total number of times.

[0132] According to the effective output confidence and the calculation result output statistics, the system reliability evaluation and the subsequent further generalization optimization design can be provided. After a large amount of data collection and training, the model can realize efficient and accurate debugging of the pipe network system. It should be noted that the numerical values in the above scheme (for example, the opening step value of the valve without opening degree indication, and the flow error limit 10%) are only exemplary, and are not used to limit the numerical value range.

[0133] The embodiment also provides a flow debugging system, which refers to Figure 6The flow debugging system comprises a pipe network model construction module, a data parameter setting module, a flow calculation module, a flow comparison and judgment module, and a valve opening degree calculation module. The pipe network model construction module is configured to construct a simulation pipe network model according to an actual ship pipe system. The data parameter setting module is configured to set data parameters of various components in the pipe network model, and set a resistance coefficient of a valve to be the minimum, at which the resistance coefficient of the valve is a first valve resistance coefficient. The flow calculation module is configured to calculate a first flow value in each pipe according to the data parameters and the first valve resistance coefficient. The flow comparison and judgment module is configured to compare the first flow value with a preset flow range, and judge whether the first flow value is within the preset range, and obtain a second resistance coefficient of each valve according to the flow value within the preset range. The valve opening degree calculation module is configured to calculate and obtain a first valve opening degree according to a resistance coefficient-valve opening degree curve and the second valve resistance coefficient.

[0134] Optionally, the flow comparison and judgment module further comprises a comparison and judgment module configured to judge whether the first flow value is within the preset flow range. When the first flow value is within the preset flow range, the first valve resistance coefficient is judged to be the second valve resistance coefficient. When the comparison and judgment module judges that the first flow value is not within the preset flow range, a trial calculation module sets the flow values of the pipes within the preset flow range, defines the flow values within the preset flow range as second flow values, and trial calculates the second valve resistance coefficient of each valve according to the second flow values.

[0135] Optionally, the flow debugging system further comprises an error calculation and judgment module, a resistance coefficient-valve opening degree curve correction module, and an orifice hole diameter parameter calculation module. The error calculation and judgment module is configured to calculate an error between a third flow value obtained when the first valve opening degree is applied to the actual ship pipe system and a flow value corresponding to the execution of the first valve opening degree, and judge whether to execute the first valve opening degree or determine a final execution valve opening degree according to the size of the error value. The resistance coefficient-valve opening degree curve correction module is configured to correct the resistance coefficient-valve opening degree curve according to a third valve resistance coefficient obtained when the final execution valve opening degree is executed in the actual ship pipe system and the final execution valve opening degree.

[0136] The orifice hole diameter parameter calculation module is configured to calculate a fourth valve resistance coefficient according to the corrected resistance coefficient-valve opening degree curve correction module, calculate a resistance coefficient of an orifice according to the fourth valve resistance coefficient and the first valve resistance coefficient, and further calculate a hole diameter parameter of the orifice according to the resistance coefficient of the orifice.

[0137] The flow debugging method and system can provide high-precision flow data guarantee in the design and debugging stage of the ship cooling water system pipe network, ensure that each pipe meets the flow demand, fully solve and correct the valve opening and resistance coefficient, output the orifice plate aperture parameter, provide guidance for the later field debugging, and provide error analysis results, which has great advantages in promoting the debugging process, reducing labor, improving accuracy and material cost, etc. Through simulation debugging and later ship debugging and operation data verification, the calculation results are continuously corrected and optimized to improve the accuracy and reliability of the debugging method, and the related data in the calculation and debugging process is completely collected and a database is established to provide a basis for system reliability evaluation and further general optimization design, and to provide data support and design guidance for ship production and operation.

[0138] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A flow commissioning method for a ship cooling water system, characterized by, The method comprises the following steps: S1: constructing a pipe network model of a ship cooling water system, wherein the pipe network model comprises a plurality of components, and the plurality of components comprise pipes and valves; S2: setting data parameters and fluid parameters of each component in the pipe network model, and setting the resistance coefficient of the valve to be the minimum, wherein the resistance coefficient of the valve is a first valve resistance coefficient; S3: calculating a first flow value in each pipe according to the set value of the data parameter and the first valve resistance coefficient; S4: comparing the first flow value with a preset flow range to determine whether the first flow value is within the preset flow range, and obtaining a second valve resistance coefficient of each valve according to the flow value within the preset flow range; the step comprises: when the first flow value is within the preset flow range, the first valve resistance coefficient is the second valve resistance coefficient; when the first flow value is not within the preset flow range, setting the flow value of each pipe within the preset flow range, defining the flow value within the preset flow range as a second flow value, and calculating the second valve resistance coefficient of each valve according to the second flow value; if the calculation is successful, the resistance coefficient of each valve is the obtained second valve resistance coefficient; if the calculation fails, the pipe system of the pipe network model needs to be adjusted, and steps S1-S4 are repeated until the second valve resistance coefficient of each valve is obtained; S5: obtaining a first valve opening degree according to the resistance coefficient-valve opening degree curve and the second valve resistance coefficient; S6: applying the first valve opening degree to an actual ship pipe system to obtain a flow value in the actual ship pipe system, which is recorded as a third flow value; S7: calculating an error value between the third flow value and a model flow value corresponding to the first valve opening degree, and determining whether to execute the first valve opening degree or determining a final valve execution opening degree according to the size of the error value.

2. The flow conditioning method of claim 1, wherein, In the step of determining whether to execute the first valve opening degree according to the size of the error value, the step further comprises: when the error value is within an error range, the first valve opening degree is a final execution valve opening degree; when the error value is not within the error range, the data parameters of the pipes, valves and other components in the pipe network model are corrected, and steps S1-S7 are re-executed until the error value is within the error range, a second valve opening degree is obtained, and the second valve opening degree is used as the final execution valve opening degree.

3. The flow tuning method of claim 2, wherein, After the step of determining whether to execute the first valve opening degree or determining the final execution valve opening degree according to the size of the error value, the step further comprises: executing the final execution valve opening degree in the actual ship pipe system, obtaining an actual resistance coefficient, and recording the actual resistance coefficient as a third valve resistance coefficient; correcting the resistance coefficient-valve opening degree curve according to the final execution valve opening degree and the third valve resistance coefficient.

4. The flow tuning method of claim 3, wherein, In the step of obtaining the third valve resistance coefficient, the step comprises: calculating the third valve resistance coefficient through a differential pressure reading of a pressure sensor arranged in the actual ship pipe system.

5. The flow tuning method of claim 3, wherein, In the step of executing the final execution valve opening degree in the actual ship pipe system and obtaining the third valve resistance coefficient, the step comprises: According to the third valve resistance coefficient and the first valve resistance coefficient, the resistance coefficient of the throttle orifice plate is calculated; According to the resistance coefficient of the throttle orifice plate, the aperture parameter of the throttle orifice plate is calculated; According to the aperture parameter of the throttle orifice plate, the aperture of the throttle orifice plate in the actual ship pipeline system is verified and corrected.

6. The flow tuning method of claim 3, wherein, After the resistance coefficient-valve opening curve is corrected, further comprising: According to the fourth valve resistance coefficient, the first valve resistance coefficient, the resistance coefficient of the throttle orifice plate is calculated; According to the resistance coefficient of the throttle orifice plate, the aperture parameter of the throttle orifice plate is calculated; According to the aperture parameter of the throttle orifice plate, the aperture of the throttle orifice plate in the actual ship pipeline system is verified and corrected. The flow debugging system is applied to the flow debugging method in any one of claims 1-6, and the flow debugging system comprises:

7. A flow commissioning system, characterized by, A pipe network model construction module is configured to construct a pipe network model according to an actual ship pipeline system; A data parameter setting module is configured to set data parameters of various components in the pipe network model, and set the resistance coefficient of the valve as the minimum, at which time the resistance coefficient of the valve is the first valve resistance coefficient; A flow calculation module is configured to calculate a first flow value in each pipe according to the data parameters and the first valve resistance coefficient; A flow comparison and judgment module is configured to compare the first flow value with a preset flow range, and judge whether the first flow value is within the preset flow range, and obtain a second resistance coefficient of each valve according to the flow value within the preset flow range; A valve opening calculation module is configured to calculate and obtain a first valve opening according to the resistance coefficient-valve opening curve and the second valve resistance coefficient. The flow comparison and judgment module further comprises:

8. The flow conditioning system of claim 7, wherein, A comparison and judgment module is configured to judge whether the first flow value is within the preset flow range, and when the first flow value is within the preset flow range, the first valve resistance coefficient is judged as the second valve resistance coefficient; A trial calculation module is configured to set the flow values of the pipes within the preset flow range when the comparison and judgment module judges that the first flow value is not within the preset flow range, define the flow values set within the preset flow range as second flow values, and trial calculate the second valve resistance coefficient of each valve according to the second flow values. The flow debugging system further comprises:

9. The flow conditioning system of claim 7, wherein, An error calculation and judgment module is configured to calculate an error between a third flow value obtained when the first valve opening is applied to the actual ship pipeline system and a flow value corresponding to the execution of the first valve opening, and judge whether to execute the first valve opening or determine a final execution valve opening according to the size of the error value. The flow debugging system further comprises:

10. The flow conditioning system of claim 9, wherein, A resistance coefficient-valve opening curve correction module is configured to correct the resistance coefficient-valve opening curve according to a third valve resistance coefficient obtained when the final execution valve opening is executed in the actual ship pipeline system and the final execution valve opening. ​ The throttle orifice plate hole diameter parameter calculation module is configured to calculate a fourth valve resistance coefficient according to the corrected resistance coefficient-valve opening curve correction module, calculate a resistance coefficient of the throttle orifice plate according to the fourth valve resistance coefficient and the first valve resistance coefficient, and then calculate a hole diameter parameter of the throttle orifice plate according to the resistance coefficient of the throttle orifice plate.

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