A method and system for flow rate commissioning of a marine oil system

Abstract

The application provides a flow rate debugging method and system for a ship oil system, first, a pipe network model of the ship oil system is constructed, and a first Reynolds number value of a pipeline under a condition that a valve resistance coefficient is minimum is solved; then, it is judged whether the first Reynolds number value is in a preset range, and a second valve resistance coefficient of each valve is obtained; finally, a first valve opening is calculated according to a resistance coefficient-valve opening curve and the second valve resistance coefficient. The application carries out simulation debugging in a pipe network design stage of the ship oil system, establishes a relationship between valve openings and resistance coefficients, and makes oil flow rates of each pipeline meet the string washing requirement by adjusting the valve openings; in addition, valve opening data output by the simulation debugging can provide a reference for later actual debugging on site, and is helpful for optimizing a ship system debugging process, so that a debugging period is shortened and a ship building cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of ship pipeline flow rate regulation technology, specifically to a method and system for adjusting the flow rate of a ship's oil system. Background Technology

[0002] Marine pipelines, as a crucial component of shipboard systems, are analogous to the arteries and veins of the human body, providing the necessary working fluids such as fuel, lubricating oil, water, and compressed air to ensure the safe operation of ship equipment. With advancements in shipbuilding technology and the trend towards larger ships, marine pipelines and piping systems are becoming increasingly larger and more complex. Traditional pipeline commissioning methods relying solely on manual experience are insufficient to meet the technical requirements of modern, complex piping networks. To accelerate shipbuilding progress and shorten the power system commissioning cycle, computer simulation technology can be used to simulate pipeline system layout schemes, thereby optimizing the ship system commissioning process.

[0003] As a crucial component of a ship's piping system, the function of the ship's oil flow system is to supply sufficient and qualified fuel oil and lubricating oil to the ship's power equipment. To ensure the cleanliness of the fuel oil and lubricating oil delivered to the equipment, a significant amount of time is spent on the pipeline system's queuing process during the later stages of ship construction. Given that the working fluids remain viscous even after heating, it is necessary to continuously adjust the valve openings to change the oil flow velocity in each pipeline to complete the pipeline cleaning. When the piping system is complex, the queuing time of the aforementioned oil flow system can severely slow down the shipbuilding progress and even affect the delivery schedule.

[0004] Currently, the published patents mainly focus on the monitoring and feedback regulation process of electric regulating valves. For example, invention patent MX2016002889 provides a method for demand management and control of fluid pipeline networks. It uses a computer to control multiple valve groups in the fluid network, uses a database to calculate parameters in real time, monitors and regulates the flow rate and flow volume of each valve, and ensures the flow demand of the pipeline network.

[0005] The aforementioned patents are mainly applied in actual on-site commissioning processes, and often employ electric valves to achieve negative feedback regulation. In contrast, valves in marine industry pipeline systems are mostly manually adjustable, and their negative feedback regulation of the target variable consumes a significant amount of time. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, this invention provides a method and system for flow rate debugging of a ship's oil system. First, a pipeline network model of the ship's oil system is constructed, and the first Reynolds number of the pipeline is calculated when the valve resistance coefficient is minimized. Next, it is determined whether the first Reynolds number is within a preset range, and the second valve resistance coefficient of each valve is obtained accordingly. Finally, the first valve opening is calculated based on the resistance coefficient-valve opening curve and the second valve resistance coefficient. This invention performs simulation debugging during the ship's oil system pipeline network design phase, establishing the relationship between valve opening and resistance coefficient. By adjusting the valve opening, the oil flow velocity in each pipeline meets the flushing requirements. Furthermore, the valve opening data output from the simulation debugging can provide a reference for subsequent on-site debugging, helping to optimize the ship's system debugging process, thereby shortening the debugging cycle and reducing ship construction costs.

[0007] To achieve the above and other related objectives, the present invention provides a method for adjusting the flow rate of a ship's oil system, comprising the following steps:

[0008] S1: Construct a pipeline network model of the ship's oil system. The pipeline network model includes various components, including pipelines and valves.

[0009] S2: Set the data parameters of various components in the pipeline model, and set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient.

[0010] S3: Calculate the first Reynolds value of the fluid in each section of the pipeline based on the set values ​​of the data parameters and the resistance coefficient of the first valve.

[0011] S4: Determine whether the first Reynolds value is within a preset range, and thereby obtain the second valve resistance coefficient for each valve;

[0012] S5: Calculate the opening degree of the first valve based on the resistance coefficient-valve opening curve and the resistance coefficient of the second valve.

[0013] Optionally, in step S4, if the first Reynolds value is within a preset range, the first valve resistance coefficient is recorded as the second valve resistance coefficient.

[0014] Optionally, in step S4, if the first Reynolds value is outside the preset range, the Reynolds value within the preset range is recorded as the second Reynolds value, and the second valve resistance coefficient of each valve is calculated based on the second Reynolds value.

[0015] Optionally, if the second valve resistance coefficient is successfully calculated based on the second Reynolds value, then the second valve resistance coefficient is obtained.

[0016] Optionally, if the calculation of the second valve resistance coefficient based on the second Reynolds value fails, the pipeline system of the pipeline network model is adjusted, and steps S2 to S4 are repeated until the second valve resistance coefficient is obtained.

[0017] Optionally, adjustments to the piping system of the network model may include setting the pipe with the smallest Reynolds value as a blind end in the simulation software.

[0018] Optionally, the Reynolds value within the preset range is greater than 4000.

[0019] The present invention also provides a flow rate adjustment system, the flow rate adjustment system being used in any of the flow rate adjustment methods described above, comprising:

[0020] The pipeline model building module is used to build a pipeline model based on the actual ship pipeline system.

[0021] The data parameter setting module is used to set the data parameters of various components in the pipeline network model and set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient.

[0022] The Reynolds number calculation module is used to calculate the first Reynolds value in each pipeline segment based on the data parameters and the first valve resistance coefficient.

[0023] The Reynolds number comparison module is used to compare the first Reynolds number with a preset range;

[0024] The valve opening calculation module is used to calculate the opening of the first valve based on the resistance coefficient-valve opening curve and the second valve resistance coefficient.

[0025] Optionally, the Reynolds number comparison module further includes:

[0026] The judgment module determines that the first valve resistance coefficient is the second valve resistance coefficient when the first Reynolds value is found to be within a preset range.

[0027] When the first Reynolds value is found to be outside the preset range, the trial calculation module records the Reynolds value within the preset range as the second Reynolds value, and calculates the second valve resistance coefficient of each valve based on the second Reynolds value.

[0028] The flow rate adjustment method and system for marine oil systems provided by this invention have at least the following beneficial effects:

[0029] This invention performs simulation debugging during the design phase of the ship's oil system pipeline network, establishes the relationship between valve opening and resistance coefficient, and adjusts the valve opening to ensure that the oil flow velocity in each pipeline meets the flushing requirements. In addition, the valve opening data output by the simulation debugging can provide a reference for the subsequent actual on-site debugging, which helps to optimize the ship system debugging process, thereby shortening the debugging cycle and reducing the ship construction cost.

[0030] The flow rate adjustment system provided by this invention is used in the above-mentioned flow rate adjustment method and has the same technical effects. Attached Figure Description

[0031] Figure 1 The diagram shown is a flow chart of the flow rate adjustment method for a ship oil system provided in Example 1.

[0032] Figure 2 The image shown is a simulation diagram of the ship oil system provided in Example 1.

[0033] Figure 3 The diagram shows the operation steps of the flow rate adjustment method for a ship oil system provided in Example 1.

[0034] Figure 4a The graph shown is a flow resistance coefficient versus valve opening curve for a valve without valve opening indication in Example 1.

[0035] Figure 4b The graph shown is a flow resistance coefficient-valve opening curve for a valve with a valve opening indicator in Example 1.

[0036] Figure 5 The diagram shown is a schematic of the flow rate adjustment system for a ship oil system provided in Embodiment 2. Detailed Implementation

[0037] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Although the illustrations only show components related to the present invention and are not drawn according to the actual number, shape and size of the components, the shape, quantity, positional relationship and proportion of each component can be arbitrarily changed under the premise of realizing the technical solution of this invention, and the layout of the components may also be more complex.

[0039] Example 1

[0040] This embodiment provides a method for adjusting the flow rate of a ship's oil system, such as... Figure 1 As shown, it includes the following steps:

[0041] S1: Construct a pipeline network model of the ship's oil system. The pipeline network model includes various components, including pipelines and valves.

[0042] As an example, a pipeline network model of a ship's oil system is constructed. In this embodiment, the pipeline network model is as follows: Figure 2 As shown, this pipeline network model includes various components, primarily including all pipes, pipe fittings (valves, tees, elbows, reducers, etc.), and various equipment. Simultaneously, the boundary conditions of the oil system pipeline network, including data parameters for various components, also need to be acquired.

[0043] S2: Set the data parameters of various components in the pipeline model, and set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient.

[0044] like Figure 3 As shown, the parameters of each component and fluid in the pipeline network model are set, mainly including pipeline and pipe fitting parameters, equipment inlet and outlet parameters, pump performance curves, and fluid parameters (density, temperature, and pressure) in the pipe.

[0045] like Figure 3 As shown, all valves in the pipeline model are set to the fully open state, minimizing the resistance coefficient of each valve. This minimum resistance coefficient is then recorded as the first valve resistance coefficient. Specific values ​​can be retrieved through the program or obtained from Table 1.

[0046] Table 1. Minimum resistance coefficients for gate valves, check valves, and globe valves.

[0047]

[0048] As an example, the minimum resistance coefficient of a butterfly valve is calculated using formula (1):

[0049]

[0050] Where ξ is the minimum resistance coefficient of the butterfly valve, and g is the acceleration due to gravity (9.81 m / s²). 2 P2 is the local resistance loss head (Pa), and V is the flow velocity (m / s).

[0051] S3: Calculate the first Reynolds value of the fluid in each section of the pipeline based on the set values ​​of the data parameters and the resistance coefficient of the first valve.

[0052] After the valves are set, pipeline network software such as Applied Flow Technology and Flowmaster, or independent simulation software, are used to iteratively solve the problem and obtain the flow velocity of each pipeline segment. Combined with the above data parameters, the Reynolds value Re of each pipeline segment is obtained and recorded as the first Reynolds value.

[0053] S4: Determine whether the first Reynolds value is within a preset range, and thereby obtain the second valve resistance coefficient for each valve;

[0054] As an example, the first Reynolds value is compared with a preset range to determine whether the first Reynolds value is within the preset range. In this embodiment, as... Figure 3 As shown, the preset range Re > 4000. It should be noted that if the simulation results for all pipelines in the system meet the Re > 4000 condition, it indicates that the flow inside the pipes is turbulent and a relatively ideal cross-flow cleaning effect can be achieved. If Re ≤ 4000 for some pipelines, it indicates that the flow inside the corresponding pipelines is slow, and contaminants such as solid particles are difficult to move with the mainstream, which may lead to a long cross-flow cleaning cycle. Therefore, setting the preset range within the Re > 4000 range can ensure the ideal cross-flow cleaning effect of the marine oil system and improve the efficiency of cross-flow cleaning.

[0055] As an example, when the first Reynolds value is within a preset range, the first valve resistance coefficient can be used as the second valve resistance coefficient.

[0056] As an example, when the first Reynolds number is outside the preset range, the Reynolds number of each pipeline is set within the preset range, and the Reynolds number within the preset range is defined as the second Reynolds number. Based on the second Reynolds number, the second valve resistance coefficient of each valve is calculated. Specifically, the resistance coefficient of each pipeline valve is set as the independent variable, with a minimum value of the resistance coefficient when the valve is fully open and a maximum value of 80. The Reynolds number Re (i.e., the target variable) for each pipeline segment is set to Re > 4000, and then the resistance coefficient of each valve is solved.

[0057] In an optional embodiment, if the trial calculation is successful, the resistance coefficient of each valve that is successfully calculated is the second valve resistance coefficient of each valve.

[0058] In another alternative embodiment, if the trial calculation fails, the piping system of the pipe network model needs to be adjusted, and steps S2 to S4 are repeated until the second valve resistance coefficient of each valve is obtained. Adjusting the piping system of the pipe network model includes setting the pipe with the smallest Reynolds value as a blind end in the simulation software.

[0059] As an example, existing commercial software can be used for trial calculations. When the Reynolds number Re in the pipeline is ≤4000, the opening of one or more valves should be reduced, and the Reynolds number should be calculated again through trial calculations or iterations. When the calculated Reynolds number is greater than 4000, the solution is considered successful. If the Reynolds number cannot reach this preset range regardless of the valve opening adjustment, the pipeline system needs to be adjusted. The pipeline with the lowest Reynolds number in the pipeline model should be set as a blind end, and steps S2 to S4 should be repeated until the Reynolds number Re reaches the preset range, thereby obtaining the second valve resistance coefficient for each valve. The pipeline set as a blind end needs to output the pipeline removal location for subsequent on-site cleaning.

[0060] S5: Calculate the opening degree of the first valve based on the resistance coefficient-valve opening curve and the resistance coefficient of the second valve.

[0061] As an example, based on the second valve resistance coefficient obtained in step S4, and the existing resistance coefficient-valve opening curve, such as... Figure 4a and 4b As shown, the first valve opening degree is obtained.

[0062] Finally, the debugging results are output, including the Reynolds number of all pipelines and the opening degree of the first valve. Based on these results, a basis can be provided for system reliability assessment and subsequent general optimization design. After extensive data collection and training, the model can achieve efficient and accurate debugging of the pipeline system. It should be noted that the values ​​in the above invention are merely illustrative and not intended to limit their range.

[0063] Example 2

[0064] This embodiment provides a flow rate adjustment system, such as Figure 5 As shown, the flow rate adjustment system includes a pipeline model construction module, a data parameter setting module, a Reynolds number calculation module, a Reynolds number comparison module, and a valve opening calculation module. This flow rate adjustment system is used in the flow rate adjustment method for marine oil systems provided in Example 1.

[0065] As an example, the pipeline network model construction module is used to construct a simulated pipeline network model based on the actual ship pipeline system; the data parameter setting module is used to set the data parameters of various components in the pipeline network model and set the resistance coefficient of the valve to the minimum, at which point the resistance coefficient corresponding to the valve is the first valve resistance coefficient; the Reynolds number calculation module is used to calculate the first Reynolds value in each pipeline segment based on the data parameters and the first valve resistance coefficient; the Reynolds number comparison module is used to compare the first Reynolds value with a preset range; and the valve opening calculation module is used to calculate the first valve opening.

[0066] As an example, the Reynolds number comparison module also includes a judgment module and a trial calculation module. When the comparison shows that the first Reynolds value is within a preset range, the judgment module determines that the first valve resistance coefficient is the second valve resistance coefficient. When the comparison shows that the first Reynolds value is outside the preset range, the trial calculation module records the Reynolds value within the preset range as the second Reynolds value, and calculates the second valve resistance coefficient for each valve based on the second Reynolds value.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for adjusting the flow rate of a ship's oil system, characterized in that, Includes the following steps: S1: Construct a pipeline network model of the ship's oil system. The pipeline network model includes various components, including pipelines and valves. S2: Set the data parameters of various components in the pipeline model, and set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient. S3: Calculate the first Reynolds value of the fluid in each section of the pipeline based on the set values ​​of the data parameters and the resistance coefficient of the first valve. S4: Determine whether the first Reynolds value is within a preset range, and thereby obtain the second valve resistance coefficient for each valve; if the first Reynolds value is outside the preset range, record the Reynolds value within the preset range as the second Reynolds value, and calculate the second valve resistance coefficient for each valve based on the second Reynolds value; if the calculation of the second valve resistance coefficient based on the second Reynolds value is successful, the second valve resistance coefficient is obtained; if the calculation of the second valve resistance coefficient based on the second Reynolds value fails, adjust the pipeline system of the pipeline network model, and repeat steps S2~S4 until the second valve resistance coefficient is obtained; adjusting the pipeline system of the pipeline network model includes: setting the pipeline with the smallest Reynolds value as a blind end in the simulation software; S5: Calculate the opening degree of the first valve based on the resistance coefficient-valve opening curve and the resistance coefficient of the second valve.

2. The flow rate adjustment method according to claim 1, characterized in that, In step S4, if the first Reynolds value is within a preset range, the first valve resistance coefficient is recorded as the second valve resistance coefficient.

3. The flow rate adjustment method according to claim 1, characterized in that, The preset range has a Reynolds value greater than 4000.

4. A flow rate adjustment system, characterized in that, The flow rate adjustment system is used in the flow rate adjustment method according to any one of claims 1 to 3, comprising: The pipeline model building module is used to build a pipeline model based on the actual ship pipeline system. The data parameter setting module is used to set the data parameters of various components in the pipeline network model and set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient. The Reynolds number calculation module is used to calculate the first Reynolds value in each section of the pipeline based on the data parameters and the first valve resistance coefficient. The Reynolds number comparison module is used to compare the first Reynolds number with a preset range; The valve opening calculation module is used to calculate the opening of the first valve based on the resistance coefficient-valve opening curve and the second valve resistance coefficient.

5. The flow rate adjustment system according to claim 4, characterized in that, The Reynolds number comparison module also includes: The judgment module determines that the first valve resistance coefficient is the second valve resistance coefficient when the first Reynolds value is found to be within a preset range. When the first Reynolds value is found to be outside the preset range, the trial calculation module records the Reynolds value within the preset range as the second Reynolds value, and calculates the second valve resistance coefficient of each valve based on the second Reynolds value.

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