澜沧江跨越天然气管道孔口向下泄漏扩散规律研究

发布时间：2018-12-14 19:11

【摘要】：中缅管道澜沧江跨越管桥属于原油、成品油、天然气管道三管同桥敷设,桥面情况复杂,位置险要、气候多变、自然灾害频发,属于控制性工程,为了给应急预案的制定提供依据和完善天然气孔口向下泄漏扩散理论,在前期调研和气体理论基础上利用FLUENT软件、工程数学方法、系统学方法和统计学方法针对中缅管线澜沧江跨越管桥天然气管道孔口向下泄漏扩散规律进行了研究,得出了各影响因素的泄漏扩散规律和敏感度大小,最后编制和编写了“中缅管线澜沧江跨越管桥天然气泄漏扩散危害范围预测表和程序”。主要研究工作和成果有：(1)阐述了澜沧江跨越管桥天然气管道孔口向下泄漏扩散规律研究的背景和意义,并对天然气孔口向下泄漏扩散的国内外理论模型和软件模拟研究进行了对比分析；(2)通过分析管道孔口向下壁面射流的过程和特点,对天然气泄漏扩散基本方程进行了对比,对孔口向下射流的泄漏速率和泄漏初速度方程进行了选取,最后分析了影响管道孔口向下泄漏扩散规律的相关因素；(3)通过澜沧江跨越管桥现场调研和技术交流,对研究所需管桥场区、桥面及天然气管道相关数据和资料进行了收集、拣选和分类；(4)利用GAMBIT软件建立了澜沧江跨越管桥天然气管道孔口向下泄漏扩散规律研究的几何模型并设定了边界条件,对FLUENT的运行模型进行了对比、分析和选取,进行了网格无关性验证；(5)研究了澜沧江跨越天然气管道孔口向下泄漏扩散规律,得出了天然气在“泄漏口形状、孔径大小、泄漏压力、大气温度及湿度、风向及风速”影响因素下的扩散规律并利用工程数学方法建立了插值函数,最后利用系统学方法对各因素的敏感性进行了分析,得出了敏感度大小排序；(6)确定了澜沧江跨越天然气管道泄漏扩散的240种典型工况并利用统计学方法建立了四元四次方函数,在此基础上编制了“中缅管线澜沧江跨越管桥天然气泄漏危害范围预测表”；利用VB语言编写了“中缅管线澜沧江跨越管桥天然气泄漏危害范围预测程序”。
[Abstract]:The Lancang River crossing bridge in the Sino-Myanmar pipeline belongs to crude oil, refined oil, and natural gas pipelines. The bridge deck is complex, the location is dangerous, the climate is changeable, natural disasters occur frequently, and belong to the control project. In order to provide the basis for the formulation of emergency plan and perfect the theory of natural gas leakage and diffusion down through the orifice of natural gas, FLUENT software and engineering mathematical method are used on the basis of previous investigation and gas theory. Systematic and statistical methods are used to study the leakage and diffusion law of natural gas pipeline orifices in Lancang River crossing pipeline bridge of Sino-Myanmar pipeline, and the leakage diffusion law and sensitivity of each influencing factor are obtained. Finally, a prediction table and program for the hazard range of natural gas leakage and diffusion of the Lancang River across the pipe bridge of the Sino-Myanmar pipeline is compiled and compiled. The main research work and results are as follows: (1) the background and significance of the research on the leakage and diffusion law of the orifice of the natural gas pipeline of Lancang River crossing bridge are expounded. The theoretical model and software simulation of the downward leakage diffusion of natural gas orifice are compared and analyzed. (2) by analyzing the process and characteristics of the down-wall jet at the orifice of the pipeline, the basic equation of natural gas leakage and diffusion is compared, and the leakage rate and initial velocity equation of the down-flow of the orifice are selected. Finally, the related factors affecting the leakage and diffusion law of pipeline orifice are analyzed. (3) through field investigation and technical exchange of Lancang River crossing pipe bridge, the paper collects, selects and classifies the relevant data and data of the research area, deck and natural gas pipeline; (4) by using GAMBIT software, the geometric model for the study of the downward leakage and diffusion law of the natural gas pipeline opening of the Lancang River crossing bridge is established, and the boundary conditions are set up. The operation model of FLUENT is compared, analyzed and selected. The grid independence is verified. (5) the downward leakage and diffusion rule of Lancang River across the orifice of natural gas pipeline is studied, and the "shape of leakage port, pore size, leakage pressure, atmospheric temperature and humidity" of natural gas are obtained. The law of diffusion under the influence of wind direction and wind speed is analyzed, and the interpolation function is established by using engineering mathematics method. Finally, the sensitivity of each factor is analyzed by systematics method, and the order of sensitivity is obtained. (6) 240 typical conditions of leakage and diffusion of Lancang River across natural gas pipeline are determined, and the quaternion quadrilateral function is established by using statistical method. On the basis of the above work, a forecast table of the harm range of natural gas leakage from the Lancang River crossing bridge of the Sino-Myanmar pipeline is compiled. Using VB language, a program for predicting the damage range of natural gas leakage from the Lancang River crossing bridge of the Sino-Myanmar pipeline has been compiled.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE88

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