湿天然气管道积液特性研究
发布时间：2018-08-30 18:25
【摘要】：随着天然气需求量的增大,天然气的安全输送成为重要问题。由于天然气在输送过程中管道内会有部分凝析液生成,因此天然气管道流动为典型的低含液量气液两相流动。然而低含量液体对天然气输运系统的运能和效率有非常大的影响,只有精确预测出管内流动压降和积液情况才能正确设计管线尺寸及下游设备。不同的运行条件下其气液界面形状会不同,根据不同形状气液界面建立的模型所计算出的压降差异很大。因此,研究湿天然气管道积液的截面几何特性对气液两相流模型建立具有重要理论价值,对管线输送的安全及效率也具有非常重要的意义。本文在开展深入文献研究的的基础上对湿气管道流动中积液下凹界面的形成及判别进行了介绍,通过编程计算对不同界面机理模型开展理论分析,并和实验数据对比,分析、比较了一些重要低含液量气液两相流模型预测压降精度和适用情况,本文推荐低气速(10m/s)使用FLAT模型;中高气速(10-20m/s)使用ARS、MARS模型;高气速(20m/s)使用双圆模型。在对已有模型做理论研究和数据分析对比的基础上,改进了适用于低气速的水平界面模型中湿壁分数计算关系式,本文将ARS模型、MARS模型中计算湿壁分数引入FLAT模型中,建立了一个含韦伯数、弗劳德数的水平界面模型湿壁分数计算关系式。并利用ARS模型计算压力梯度公式简化运算步骤。相对于FLAT模型,本文提出的模型预测结果和实验值符合更好。
[Abstract]:With the increase of natural gas demand, the safe transportation of natural gas becomes an important problem. Because part of condensate will be produced in the pipeline during the transportation, the natural gas pipeline flow is a typical two-phase flow with low liquid content. The pipeline size and downstream equipment can be designed correctly only by accurately predicting the flow pressure drop and liquid accumulation in the pipeline. The gas-liquid interface shapes will be different under different operating conditions. The pressure drop calculated by the model based on the gas-liquid interface of different shapes is very different. The establishment of gas-liquid two-phase flow model has important theoretical value and is of great significance to the safety and efficiency of pipeline transportation. Based on the in-depth literature study, this paper introduces the formation and discrimination of the concave interface of liquid accumulation in wet gas pipeline flow, and develops the theory of different interface mechanism models through programming and calculation. In this paper, FLAT model is recommended for low gas velocity (10m/s), ARS model for medium and high gas velocity (10-20m/s), MARS model for high gas velocity (20m/s), and double circle model for high gas velocity (20m/s). On the basis of comparison, the formula for calculating wet wall fraction in horizontal interface model suitable for low gas velocity is improved. In this paper, ARS model and MARS model are introduced into FLAT model to establish a formula for calculating wet wall fraction in horizontal interface model with Weber number and Froude number. Compared with the FLAT model, the proposed model predictions are in good agreement with the experimental values.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE832
本文编号：2213923
[Abstract]:With the increase of natural gas demand, the safe transportation of natural gas becomes an important problem. Because part of condensate will be produced in the pipeline during the transportation, the natural gas pipeline flow is a typical two-phase flow with low liquid content. The pipeline size and downstream equipment can be designed correctly only by accurately predicting the flow pressure drop and liquid accumulation in the pipeline. The gas-liquid interface shapes will be different under different operating conditions. The pressure drop calculated by the model based on the gas-liquid interface of different shapes is very different. The establishment of gas-liquid two-phase flow model has important theoretical value and is of great significance to the safety and efficiency of pipeline transportation. Based on the in-depth literature study, this paper introduces the formation and discrimination of the concave interface of liquid accumulation in wet gas pipeline flow, and develops the theory of different interface mechanism models through programming and calculation. In this paper, FLAT model is recommended for low gas velocity (10m/s), ARS model for medium and high gas velocity (10-20m/s), MARS model for high gas velocity (20m/s), and double circle model for high gas velocity (20m/s). On the basis of comparison, the formula for calculating wet wall fraction in horizontal interface model suitable for low gas velocity is improved. In this paper, ARS model and MARS model are introduced into FLAT model to establish a formula for calculating wet wall fraction in horizontal interface model with Weber number and Froude number. Compared with the FLAT model, the proposed model predictions are in good agreement with the experimental values.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE832
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