CN116362153A - CFD-based calculation method for sequential conveying mixed oil length of reducer pipe finished oil - Google Patents

CFD-based calculation method for sequential conveying mixed oil length of reducer pipe finished oil Download PDF

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CN116362153A
CN116362153A CN202310252415.7A CN202310252415A CN116362153A CN 116362153 A CN116362153 A CN 116362153A CN 202310252415 A CN202310252415 A CN 202310252415A CN 116362153 A CN116362153 A CN 116362153A
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朱嘉豪
谢英
曹甜
王艇鹏
左直建
王文杰
郑杨铭
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Southwest Petroleum University
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Abstract

The invention discloses a calculation method for sequentially conveying mixed oil length of finished oil based on CFD reducer pipes, and belongs to the field of mixed oil metering in finished oil transportation. The calculation formulas of the mixed oil length of the reducing pipe adopted at present are mostly derived from an empirical formula or a theoretical formula, the calculation is complex, and the results are also greatly different. According to the invention, FLUENT software is utilized to carry out mixed oil numerical simulation research on different flow rates, variable taper angles, pipe diameter ratios, viscosities and other conditions of the reducer pipe. Based on simulation results and theoretical analysis and research, a correction coefficient is added on the basis of a theoretical formula to obtain a reducer pipe oil mixing length calculation formula, and the rationality of the formula is verified. The invention considers the influence of multiple factors, and is more practical, and provides a calculation method for the mixed oil length of the finished oil sequential delivery based on the CFD reducer, which expands the calculation method for the mixed oil length of the reducer, improves the accuracy of calculation results, better guides the mixed oil cutting operation, saves the cost and improves the benefit.

Description

CFD-based calculation method for sequential conveying mixed oil length of reducer pipe finished oil
Technical Field
The invention belongs to the field of mixed oil metering in finished oil transportation, and particularly relates to a calculation method for a CFD-based sequential conveying mixed oil length of reducer pipe finished oil.
Background
The sequential conveying of the finished oil pipelines is to convey various oil products on long-distance pipelines in batches, so that the pipeline conveying capacity is effectively increased, the pipeline construction investment is reduced, the conveying cost is reduced, and the economic and technical advantages of obvious economic benefits are achieved, so that the method has become an important mode of land transportation of the finished oil. However, in the sequential conveying process, the adjacent oil products inevitably produce oil mixing due to the physical property difference and the molecular diffusion and turbulent diffusion effect when contacting with each other, so that the economic benefit is reduced. And the reducer pipes such as a reducer pipe and a divergent pipe are needed to be adopted on the special pipe section under the influence of factors such as fluctuation of the height difference, energy demand of the pipeline, supply and demand balance and the like. Because of various oil mixing influence factors of the reducer pipe, the actual oil mixing interface has a complex flow structure, and the research on the complete and accurate oil mixing process of the reducer pipe is very little at present. Therefore, in order to accurately predict the oil mixing amount at the pipe end, measures for reducing the oil mixing amount are formulated, and it is necessary to develop a study on the oil mixing calculation method of the reducer pipe.
All existing oil mixing calculation formulas have limitations, and no known oil mixing calculation formulas completely accord with the actual situation are known. The calculation formulas of the mixed oil length of the reducer pipe adopted at present are mostly derived from empirical formulas or theoretical formulas, some conditions are assumed, certain limitations are provided, the calculation is complex, and the results are also greatly different. Therefore, aiming at the influence factors of the mixed oil of the reducer, the Fluent software is utilized to analyze the diffusion rule of each influence factor under different working conditions of the reducer, the correction coefficient is added on the basis of a theoretical formula, fitting is carried out through the custom function of Origin software based on different calculation example data, a calculation method of the mixed oil length of the reducer is provided, and the rationality of the formula is verified.
Disclosure of Invention
The invention aims to provide a calculation method for the oil mixing length of a finished oil sequential conveying reducer pipe, which is characterized in that main influencing factors of the oil mixing diffusion rule of the reducer pipe are simulated and analyzed by Fluent, a correction coefficient k is provided for the defects of the existing theoretical calculation formula, curve fitting is performed by utilizing a custom function of Origin based on data under different working conditions, an expression of the correction coefficient k is obtained, and a reducer pipe oil mixing length calculation formula is provided.
The technical scheme of the invention is as follows:
the CFD-based calculation method for the mixed oil length of the finished oil sequential conveying reducer pipe comprises the following steps,
step 1: the method comprehensively analyzes that the size of the mixed oil length is mainly influenced by the diffusion rule in the sequential conveying process of the finished oil long conveying pipeline, and judges the main influencing factors of the mixed oil diffusion rule of the reducer pipe.
The influence factors of the mixed oil in the sequential conveying process of the reducer pipe mainly comprise the following aspects:
(1) A pipe flow rate; (2) pipe diameter ratio; (3) taper angle; (4) Viscosity ratio between oils
Step 2: the pipe diameter of the selected reducer pipe section is composed of a reducing pipe and a reducing pipe which are composed of 700mm, 600mm, 550mm, 500mm, 450mm, 400mm, 350mm and the like, the pipe length is 30m, the reducing cone angles are 5 degrees, 10 degrees, 15 degrees, 20 degrees and other pipe dimensions respectively, and the conveying medium is gasoline (preceding oil product) and diesel oil (following oil product). The viscosity of the forward oil is respectively selected from 0.0014 Pa.s, 0.0024 Pa.s, 0.0034 Pa.s and 0.0044 Pa.s, and the viscosity of the backward oil is 0.00332 Pa.s.
Step 3: the oil mixing model established based on Fluent is a three-dimensional pipeline oil mixing model, firstly, a pipeline three-dimensional model is established through design nMOS software in a Workbench interface, pipeline geometric model establishment is carried out through the design nMOS software, mesh division is carried out through Mesh software by selecting a MultiZone model, initial conditions and boundary conditions are set, and the initial conditions are as follows: the volume fraction of the oil product of the subsequent operation is set to 0, the volume fraction of the oil product of the previous operation is set to 1, and steady-state calculation is carried out on the model, so that the interior of the pipeline is filled with the oil product of the previous operation. Boundary conditions: the entry boundary condition is a velocity-inlet; the exit boundary condition is pressure-outlet. And adopting a PISO algorithm based on a pressure solver, performing numerical simulation by using Fluent software to obtain a simulation result, and analyzing the influence rule of different factors on the mixed oil length of the reducer pipe. Through simulation analysis, the following conclusions are summarized:
the inlet flow speed is increased, and the mixed oil length of the reducer pipe is reduced; the variable-diameter cone angle is increased, the mixed oil length of the variable-diameter pipe is also increased, but the influence of the variable-diameter cone angle on the gradually-expanding pipe is larger than that of the gradually-reducing pipe; in the reducer, the larger the difference between the front pipe diameter and the rear pipe diameter is, the shorter the oil mixing section is; in the gradually-expanding pipe, the larger the difference between the front pipe diameter and the rear pipe diameter is, the longer the oil mixing section is; the viscosity ratio of the forward oil product to the backward oil product has larger influence on the oil mixing length of the gradual expansion pipe, and the smaller the viscosity ratio of the forward oil product to the backward oil product is, the shorter the oil mixing length is.
Step 4: correcting a theoretical calculation formula of the oil mixing length of the horizontal equal-diameter pipeline, providing a correction coefficient k, and providing a calculation formula of the oil mixing length of the pipeline with the reducer pipe as follows:
Figure BDA0004128333610000031
wherein C is the oil mixing length of the pipeline and m; l is the length of the pipeline, m; d is the inner diameter of the pipeline, m; re (Re) pj The average Reynolds number of the two oil products in the oil mixing section; alpha is a correction coefficient; k is the correction factor set forth herein; z is a complex variable and is related to cleavage concentration.
According to the multiple regression theory, an expression of a correction coefficient k is constructed by the influence factors such as flow rate, taper angle, pipe diameter ratio, oil viscosity ratio and the like:
Figure BDA0004128333610000032
wherein DeltaD is the ratio of the reducer pipe to the main pipe diameter; Δl is the ratio of the variable diameter section to the main pipe section;v is the flow rate, m/s; delta mu is the ratio of viscosity of the oil before and after the oil; a, a 1 ～a 12 Is a coefficient to be determined.
Step 5: the main pipe diameter, the reducer pipe diameter, the main pipe section, the reducer pipe section, the flow velocity, the viscosity of the forward oil, the viscosity of the backward oil and the like are combined into different working conditions, and a model is built by using Fluent, so that specific values of the mixed oil length of the reducer pipe and the mixed oil length of the straight pipe under different working conditions can be calculated. The correction coefficient k of different working conditions can be obtained through the ratio of the oil mixing length of the reducer pipe to the oil mixing length of the straight pipeline.
The main pipe diameter is 0.5m, the reducer pipe is 0.3, 0.4, 0.6 and 0.7m, the main pipe section is 30m, the reducer pipe section is 5, 10, 15 and 20m, the flow rate is 1.6, 1.4, 1.8 and 2m/s, the viscosity of the forward oil is 0.0024 Pa.s, and the viscosity of the backward oil is 0.0032 Pa.s, so that 10 working conditions are formed; and the mixed oil length and the correction coefficient of the variable-diameter pipeline under each working condition are calculated through simulation.
Based on the values of known correction coefficients k, delta D, delta L, V and delta v under 10 different working conditions, curve fitting is performed by adopting a custom function of Origin software, and coefficients a 1-a 12 are determined. Obtaining a calculation formula of a correction coefficient k:
Figure BDA0004128333610000041
the square (R2) of the correlation coefficient of the fitting is as high as 0.9972, indicating a good fitting effect.
Step 6: based on 8 different working condition parameters of sequential conveying of the mixed oil of the reducer pipe, the mixed oil length calculation formula of the reducer pipe and the mixed oil length calculation formula of the reducer pipe with the equivalent pipe length method are respectively calculated to obtain the mixed oil lengths of the reducer pipe and the reducer pipe, and the mixed oil length calculation formula is compared with the mixed oil length result obtained by Fluent simulation calculation. The reasonability of the reducer pipe oil blend length calculation formula presented herein has been verified.
Drawings
FIG. 1 is a partial schematic diagram of pipeline meshing for Fluent modeling.
Fig. 2 is a calculation process of numerical simulation.
FIG. 3 is a table of parameters for the oil mixing length and correction factor of the pipe and the reducer pipe under different working conditions.
Fig. 4 is a table of parameters of oil mixing conditions of the reducer pipe under 8 different working conditions.
FIG. 5 is a graph of comparison results.
Fig. 6 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, which are intended to illustrate the general inventive concept.
The invention belongs to the field of mixed oil metering in finished oil transportation, and relates to a method for calculating the mixed oil length of a reducer pipe, which comprises the steps of summarizing the influence rule of different factors on the mixed oil length of the reducer pipe conveyed sequentially through Fluent simulation analysis, correcting a theoretical formula based on a simulation result, fitting a correction coefficient k by using Origin software and a multiple regression theory, obtaining a calculation formula of the mixed oil length of the reducer pipe, and verifying rationality of the formula.
The main influencing factors of the mixed oil length of the finished oil pipeline sequential conveying reducer pipe are as follows: the flow rate of the pipeline, the pipe diameter ratio, the variable cone angle and the viscosity ratio between the oil products.
A three-dimensional pipeline oil mixing model is established based on Fluent, and pipe diameters are selected to be composed of a reducing pipe and a diverging pipe by comprehensively considering 700mm, 600mm, 550mm, 500mm, 450mm, 400mm, 350mm and the like, the pipe length is 30m, and variable diameter cone angles are respectively selected from various pipeline sizes of 5 degrees, 10 degrees, 15 degrees, 20 degrees and the like. The viscosity of the forward oil is respectively selected from 0.0014 Pa.s, 0.0024 Pa.s, 0.0034 Pa.s and 0.0044 Pa.s, and the viscosity of the backward oil is 0.00332 Pa.s.
In consideration of the fact that oil products belong to incompressible fluid and in consideration of convergence stability and simulation requirements, a PISO algorithm based on a pressure solver is adopted in the numerical simulation of the sequential oil mixing process.
The pipeline local grid division of Fluent modeling is shown in fig. 1, and the calculation process of numerical simulation is shown in fig. 2.
According to the simulation calculation result, the influence rule of each factor on the mixed oil length of the reducer pipe is summarized as follows:
(1) For the pipe section with the reducer, the flow speed is increased, the scouring capability of the backward oil product to the residual forward oil product on the pipe wall is strong, the oil mixing tail is shorter, and therefore, the generated oil mixing amount is smaller; for pipe sections where a diverging pipe is present, the smaller the flow rate, the more the two oils are blended. So that the inlet flow speed is increased and the mixed oil length of the reducer pipe is reduced.
(2) The larger the reducing angle of the reducer is, the larger the energy loss of the pipe is, the larger the low flow velocity area at the corner is, and the longer the formed oil mixing section is; the larger the diameter-variable cone angle of the gradually-increased pipe is, the larger the vortex size formed between the pipe wall and the oil mixing section is, the more energy for keeping the vortex to continue flowing is needed, the larger the lost energy is, the longer the backward oil washes the forward oil, the longer the forward oil stays at the corner, and the longer the formed oil mixing section is. Therefore, the reducing cone angle can enable the oil mixing section to be in smooth transition, and the length of the mixed oil can be effectively shortened.
(3) In the reducer, under the condition of the same flow, the flow rate with smaller pipe diameter after diameter change is also larger, and the replacement time required by the same section is shorter, so that the larger the difference between the front pipe diameter and the rear pipe diameter is, the shorter the oil mixing section is; in the gradually-expanded pipe, the larger the difference between the front pipe diameter and the rear pipe diameter is under the condition of the same flow, the longer the replacement time required by the same section is, and the longer the oil mixing section is.
(4) The viscosity ratio of the forward oil product to the backward oil product has larger influence on the oil mixing length of the gradual expansion pipe, and the smaller the viscosity ratio of the forward oil product to the backward oil product is, the shorter the oil mixing length is.
And according to the obtained simulation conclusion, providing a correction coefficient k, and correcting the theoretical calculation formula of the oil mixing length of the horizontal equal-diameter pipeline. The expression of the correction coefficient k is composed of a plurality of influence factors of the mixed oil length of the reducer pipes, and the expression is as follows:
Figure BDA0004128333610000061
wherein DeltaD is the ratio of the reducer pipe to the main pipe diameter; ΔL is the variable diameter sectionThe ratio of the main pipe sections; v is the flow rate, m/s; delta mu is the ratio of viscosity of the oil before and after the oil; a, a 1 ～a 12 Is a coefficient to be determined.
A parameter table based on 10 different pipeline specifications under different working conditions, the mixed oil length of the reducer pipe and the correction coefficient is shown in fig. 3; and (3) performing curve fitting by adopting a custom function of Origin software, and determining coefficients of a 1-a 12. Namely, the calculation formula of the correction coefficient k is as follows:
Figure BDA0004128333610000062
the square (R2) of the correlation coefficient of the fitting is as high as 0.9972, indicating a good fitting effect.
The parameter table based on the oil mixing condition of 8 different working conditions of the sequential conveying reducer pipe is shown in fig. 4. The oil mixing length calculation formula of the reducer pipe and the oil mixing length calculation formula of the reducer pipe with the equivalent pipe length method are respectively calculated to obtain the oil mixing lengths of the reducer pipe and the reducer pipe, and the oil mixing length results obtained through Fluent simulation calculation are compared, and the comparison result is shown in fig. 5.
As can be seen from the comparison result graph, the calculation formula provided in the text is closer to the Fluent simulation result than the calculation formula of the oil mixing length of the reducer pipe with the equivalent pipe length method. This is because the calculation formula itself of the oil mixing length of the equivalent pipe length method reducer pipe has limitations, which makes the calculation error large. The correction calculation formula provided by the method considers the influence of the pipe diameter ratio, the pipe section ratio, the flow velocity, the front-back oil viscosity ratio and other influence factors on the mixed oil length of the reducer pipe, and is suitable for calculating the mixed oil length of the reducer pipe in the sequential conveying of the finished oil pipelines.

Claims (3)

1. A calculation method for the sequential conveying mixed oil length of a reducing pipe based on CFD is characterized by comprising the following steps: the method specifically comprises the following steps of comprehensively analyzing the main influence factors of the mixed oil diffusion rule of the reducer pipe, namely the flow rate, the pipe diameter ratio, the variable cone angle and the viscosity ratio of the pipe, because the mixed oil length is mainly influenced by the diffusion rule in the sequential conveying process of the long conveying pipe.
2. According to claim 1, the flow rate, the pipe diameter ratio, the variable cone angle and the viscosity have a larger influence on the oil mixing diffusion rule of the reducer pipe. Therefore, a three-dimensional model of the variable-diameter pipeline is established by utilizing CFD software, numerical simulation research is conducted on the conditions of different flow rates, variable taper angles, pipe diameter ratios, viscosity and the like of the variable-diameter pipeline, and the diffusion rule of mixed oil of each factor and the factor change rule affecting the length of the mixed oil are analyzed. Aiming at the defect of a diffusion theory formula, a correction coefficient is added on the basis of the theory formula. A calculation method for the mixed oil length of the finished oil sequential conveying reducer pipe based on CFD is provided.
3. The method for calculating the mixed oil length of the CFD-based finished oil sequential conveying reducer pipe, according to claim 2, specifically comprises the following steps:
step 1: correcting a theoretical calculation formula of the oil mixing length of the horizontal equal-diameter pipeline, providing a correction coefficient k, and providing a calculation formula of the oil mixing length of the pipeline with the reducer pipe;
step 2: the method comprises the steps of 1, constructing an expression of a correction coefficient k by a plurality of factors affecting the mixed oil length of a reducer pipe;
step 3: specific values of the mixed oil length of the reducer pipe and the mixed oil length of the straight pipe under different working conditions can be calculated through the Fluent simulation model. The correction coefficient k of different working conditions can be obtained through the ratio of the oil mixing length of the reducer pipe to the oil mixing length of the straight pipeline.
Step 4: based on parameters such as 10 different pipeline specifications, oil mixing length, correction coefficient k and the like, the Origin software and the multiple regression theory are utilized to fit the correction coefficient k, coefficients a 1-a 12 are determined, and then a calculation formula of the correction coefficient k is determined.
Step 5: based on pipeline parameters under different working conditions of sequential conveying of mixed oil of the reducer pipe, the mixed oil length of the reducer pipe and the mixed oil length of the reducer pipe are calculated respectively by adopting a calculation formula of the mixed oil length of the reducer pipe and a calculation formula of the reducer pipe by an equivalent pipe length method, and the mixed oil length is compared with a mixed oil length result obtained by Fluent simulation calculation to verify the rationality of the calculation formula of the mixed oil length of the reducer pipe. The calculation formula provided by the method is more similar to a Fluent simulation result through verification, and the influence of the pipe diameter ratio, the pipe section ratio, the flow velocity, the front-back oil viscosity ratio and other influence factors on the mixed oil length of the reducer pipe is considered by the correction calculation formula, so that the method is suitable for calculating the mixed oil length of the reducer pipe for sequentially conveying the finished oil.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117150931A (en) * 2023-10-30 2023-12-01 中国石油大学(华东) Mixed oil length on-line estimation method and system based on mixed single hidden layer neural network

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117150931A (en) * 2023-10-30 2023-12-01 中国石油大学(华东) Mixed oil length on-line estimation method and system based on mixed single hidden layer neural network
CN117150931B (en) * 2023-10-30 2024-01-30 中国石油大学(华东) Mixed oil length on-line estimation method and system based on mixed single hidden layer neural network

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