Establishment method for internal pressure distribution model of 90-degree curved pipe for crude oil transmission

A technology of distribution model and establishment method, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as explosion, fire, cracking of elbows, etc., to ensure transportation safety, less undetermined coefficients, and reduce the pressure inside the pipe. Effect

Inactive Publication Date: 2016-01-13
鹿晓阳
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  • Claims
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Problems solved by technology

When the pipeline is working, the impact pressure of the crude oil fluid on the convex side of the elbow is much greater than that on the concave side of the elbow, resulting in uneven stress on the convex and concave sides of the elbow, which often leads to cracking, explosion, fire and other vicious consequences

Method used

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  • Establishment method for internal pressure distribution model of 90-degree curved pipe for crude oil transmission
  • Establishment method for internal pressure distribution model of 90-degree curved pipe for crude oil transmission
  • Establishment method for internal pressure distribution model of 90-degree curved pipe for crude oil transmission

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Embodiment 1

[0089] 1) Under different crude oil flow parameters and elbow geometric parameters, FLUENT software is used to numerically simulate the flow process of crude oil in the elbow, and a database of uneven internal pressure distribution in various working conditions of the elbow is obtained. The flow of the crude oil Parameters include crude oil density ρ, elbow outlet pressure P 0 and the flow velocity v at the inlet of the elbow; the geometric parameters of the elbow include the inner diameter of the elbow d, the bending radius R of the elbow, the bending degree of the elbow k=R / d, and the pressure acting position, wherein the pressure acting position includes the axial angle of the elbow α and the elbow circumferential angle β; among them, the elbow outlet pressure P 0 They are 2MPa, 4MPa, 6MPa, 8MPa, 10MPa, 12MPa respectively, the inlet flow velocity v of the elbow is 0.5m / s, 1.0m / s, 1.5m / s, 2.0m / s, 2.5m / s respectively, the bending degree of the elbow k are 1.0, 1.5, 2.0, 2.5,...

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Abstract

The invention discloses an establishment method for an internal pressure distribution model of a 90-degree curved pipe for crude oil transmission. According to the establishment method for the internal pressure distribution model of the 90-degree curved pipe for crude oil transmission, an internal pressure uneven distribution model of the curved pipe is built, and uneven pressure formed on the wall surface of the curved pipe and complicated change situation of the curved pipe can be correctly calculated and analyzed when crude oil passing through the curved pipe. The uneven pressure calculation and analysis model provided by the invention is formed by combining elementary functions, the establishment method is simple and intuitive, is few in undetermined coefficient and has relatively high calculation accuracy; when comparing a calculation value with a FLUENT discrete analog value, the maximum relative error Epsilon<max> is less than or equal to 0.004%; and a theoretical basis is provided for safety performance evaluation of a pipeline and the wall thickness design of the curved pipe during the transmission process of the pipeline, thus, the structural design of the curved pipe is promoted, and the running safety of a crude oil pipeline is improved.

Description

technical field [0001] The invention relates to the technical field of establishing mathematical mechanical models, in particular to a method for establishing an internal pressure distribution model of a 90° elbow for transporting crude oil. Background technique [0002] Crude oil is mainly transported or transported through the pipeline system, and the elbow is an indispensable and important part of the pipeline transportation system. When the pipeline is working, the impact pressure of the crude oil fluid on the convex side of the elbow is much greater than that on the concave side of the elbow, resulting in uneven stress on the convex and concave sides of the elbow, which often leads to cracking, explosion, fire and other vicious consequences. Especially for long-distance transportation and changing terrain, such as the design pressure of Shan-Lanxi crude oil pipeline is 8MPa, the transmission volume is 2000t / a, and the minimum design transmission volume in winter is 900t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 鹿晓阳刘金明路立平鹿晓力王路路李彬李奎郑伟黄丽丽陈世英赵晓伟赵忠佳苏亚李龙刘秀芝李涛付浩鑫蒋雄
Owner 鹿晓阳
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