天然气长输管道不完全堵塞检测技术研究

发布时间：2018-05-18 17:50

本文选题：天然气长输管道 + 不完全堵塞　；参考：《重庆科技学院》2017年硕士论文

【摘要】：随着我国经济的高速发展,能源的需求越来越大,为了满足各地对能源的需求,现在已建成了以西气东输系统、陕京系统、涩宁兰系统、川气东送系统、西南管道系统为骨架的横跨东西、纵贯南北、连通海外的全国性供气网络,管道运输已经成为天然气输送的主要方式。但随着输气管道的投产运行,材料腐蚀老化或人为破坏等因素,不可避免的会造成管道事故。特别是天然气长输管道,由于长期处于野外又缺乏日常检查及维护,很容易发生管道堵塞事故。另外,由于管道变形导致清管器运行时被卡住造成堵塞,在实际作业中经常发生。天然气长输管道发生堵塞将会导致整个运行系统的效率降低,并增加潜在的事故风险。如果能在管道发生堵塞的初期及时发现,就能提前采取清管措施,避免引起严重的管道堵塞事故。因此,寻求一种实用、可靠的对天然气长输管道发生不完全堵塞进行检测的方法是很重要的,可以确保天然气长输管道的安全运行。本文针对天然气长输管道发生不完全堵塞的情况进行了研究。基于管道中气体流动的连续性方程和运动方程,应用流体力学的方法建立天然气管道瞬变流动模型。对天然气长输管道的瞬态特性进行了研究,得到天然气长输管道中压力扰动的传播规律。对天然气长输管道不完全堵塞进行研究,得到不完全堵塞的特征参数,即:不完全堵塞的位置、长度和强度。分析管道内瞬态压力波动与管道不完全堵塞特征参数的关系,得到探索管道发生不完全堵塞的位置、长度和强度的标定方法。基于瞬态压力分析法设计了堵塞检测实验,对设计的不完全堵塞模块进行了堵塞检测,并进行了实验分析,测定了不完全堵塞的位置。研究发现不完全堵塞段的长度需要大于等于瞬态质量脉冲传播距离的1/2才能被有效检测。
[Abstract]:With the rapid development of China's economy, the demand for energy is increasing. In order to meet the demand for energy in various places, the West-East Gas Transmission system, Shaanjing system, Shining Ning Lan system, and Sichuan Gas eastward Transmission system have now been built. The southwest pipeline system is a national gas supply network, which spans the east and west, runs north and south, and connects overseas. Pipeline transportation has become the main way of natural gas transportation. However, with the production and operation of gas transmission pipeline, corrosion aging or artificial destruction of materials will inevitably lead to pipeline accidents. Especially for long distance natural gas pipeline, because of long time in the field and lack of routine inspection and maintenance, pipeline blockage is easy to occur. In addition, due to pipeline deformation, the pipe cleaner is jammed and clogged, which often occurs in practical operation. The blockage of long distance natural gas pipeline will reduce the efficiency of the whole operation system and increase the potential accident risk. If it can be found in time in the early stage of pipeline blockage, it can be taken in advance to avoid serious pipeline blockage accidents. Therefore, it is very important to find a practical and reliable method to detect incomplete blockage of long distance natural gas pipelines, which can ensure the safe operation of long distance natural gas pipelines. In this paper, the incomplete blockage of long-distance natural gas pipeline is studied. Based on the continuity equation and motion equation of gas flow in pipeline, the transient flow model of natural gas pipeline is established by the method of hydrodynamics. The transient characteristics of long distance natural gas pipeline are studied and the propagation law of pressure disturbance in long distance natural gas pipeline is obtained. In this paper, the incomplete blockage of gas pipeline is studied, and the characteristic parameters of incomplete blockage are obtained, that is, the location, length and intensity of incomplete blockage. The relationship between transient pressure fluctuation in pipeline and the characteristic parameters of incomplete blockage of pipeline is analyzed, and the calibration method of location, length and strength of pipeline incomplete blockage is obtained. Based on the transient pressure analysis method, the clogging detection experiment is designed, and the incomplete clogging module is detected, and the position of the incomplete blockage is determined by the experimental analysis. It is found that the length of incomplete blockage is more than 1 / 2 of the propagation distance of transient mass pulse in order to be effectively detected.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE973.6

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