基于文丘里原理的天然气管道吹扫清管器设计

1. 中油管道检测技术有限责任公司;2. 中国石油管道局工程有限公司维抢修分公司;3. 中油管道物资装备有限公司

天然气管道;文丘里原理;清管器;结构设计;CFD 仿真

Design of natural gas pipeline purging pig based on Venturi principle
LI Zhenbei1, CHENG Hanhua1, GUAN Jingxin1, LIANG Ye1, CHEN Feng2, ZHAO Zhen3

1. China Petroleum Pipeline Inspection Technologies Co. Ltd.; 2. Maintenance and Emergency Repair Company, China Petroleum Pipeline Engineering Co. Ltd.; 3. China Petroleum Pipeline Material & Equipment Co. Ltd.

natural gas pipeline, Venturi principle, pig, structural design, CFD simulation

DOI: 10.6047/j.issn.1000-8241.2019.12.012

备注

针对粉尘和杂质较多的天然气管道在清管过程中,常规机械清管器出现的皮碗及刷毛磨损变形严重、清管效率低下等问题,基于文丘里原理,提出一种新型清管器设计方案,将具有该原理特性的管路与清管器骨架结构设计融为一体,同时设计了相应的导向支撑板、密封驱动皮碗及前端吹扫喷头等重要零部件。借助计算流体动力学方法对所设计的清管器的清管效果进行了仿真分析,结果表明:该清管器利用文丘里原理可对两皮碗之间管段内的杂质进行有效吹扫和抽吸,通过前端吹扫喷头喷出的高速射流可以在清管器前方形成全覆盖的柱状吹扫区域,吹扫速度可以吹扫和携带颗粒直径在2.5mm以内的粉尘及杂质,具有良好的清管效果。通过该设计方案的实施,对于提高中国非常规清管器的研发和设计技术水平,促进在役天然气管道清管效能的提高,丰富清管手段的多样化具有重要的现实意义。(图 11,表 1,参 20)

In the pigging process of the natural gas pipelines with more dust and impurities, the conventional mechanicalpigs are usually faced with some problems. For example, cups and bristles are worn and deformed seriously and the piggingefficiency is low. In this paper, the pipeline with the characteristics of Venturi principle is integrated with the frameworkof pig in structural design according to the Venturi principle. Meanwhile, the corresponding guide support plate, seal drivecup, front purge nozzle and other important parts were designed. Then, the design scheme on this advanced pig was putforward. Finally, the computational fluid dynamics (CFD) method was used to simulate and analyze the pigging effect ofthis newly designed pig under the working conditions. It is shown that by virtue of Venturi principle, this pig can purgeand swab the impurities in the pipeline section between two cups. In addition, high-speed jet from the front purge nozzlecan form a full-coverage column purge area in front of the pig. And the purge speed is high enough to purge and carry thedust and impurities with the particle diameter less than 2.5 mm. Therefore, the pigging effect is good. The implementationof this design scheme is of great practical significance and value to improve the level of research and development anddesign technology of unconventional pig in China, promote the improvement of pigging efficiency of in-service natural gaspipelines and diversify the pigging methods. (11 Figures, 1 Table, 20 References)

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