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Study on Radial Heat Pipe Media Shutdown

Author: WangHaiYan
Tutor: LiuXiaoYan
School: Northeast University of Petroleum
Course: Thermal Power Engineering
Keywords: hot oil pipeline shutdown radial temperature field phase transition numerical model
CLC: TE832
Type: Master's thesis
Year: 2011
Downloads: 94
Quote: 0
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Abstract


Pipeline after shutdown, the tube temperature of crude oil decreased with time, wax crystals in the waxy crude oil gradually precipitated. With the increase in the number of wax crystals precipitate, the formation of wax crystal network structure of cross-linked with each other. When the oil pumps can provide structural strength more than the starting pressure, pipeline shutdown may make condensation tube pipeline accident, then result in huge economic loss. This shows, although the direct cause of hot oil pipeline shutdown occur condensate tube accident is water, but the root cause is thermal aspects. For the problem of oil pipeline shutdown solidification, this study as follows:1, Study crude oil solidification mechanism, conditions and influencing factors, and describes the existing crude oil wax precipitation point of the determination and the wax latent heat of the selection, by the existing heat capacity measured value and calculated value of the comparative analysis of crude oil wax process.2, Respectively zoning, enthalpy, heat capacity was used by making the pipeline shutdown radial heat transfer mathematical model. Apparent heat capacity method which is simple and practical, easy-to-be multi-dimensional marketing, multi-dimensional problems in dealing with obvious advantages when applied to solving occurs in a temperature range of phase change heat transfer problems, so this apparent heat capacity method with hot oil shutdown phase change heat transfer medium channels.3, The application of FLUENT software pipeline shutdown to simulate the radial temperature field to analyze the distribution of temperature field. By changing various physical parameters of crude oil pipeline simulation stops radial temperature field, and allow the shutdown of each parameter on the time of analysis. That’s because when the pipe line was shut down,the medium in the pipe line release too much heat(solidification latent heat),which could compensate for the heat exchanged between surface of insulating layer and outside environment. Then the allowed to shut down time of hot oil pipeline which the latent heat of wax precipitation is taken into account is far more the one which is not taken into account.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas storage and transportation > Oil and Gas Transmission and Transport > Pipeline
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