水砂射流冲蚀作用下临近燃气管道可靠性

1. 华南理工大学安全科学与工程研究所;2. 广东省安全生产科学技术研究院

水砂射流;冲蚀作用;燃气管道;Fluent;可靠性

The reliability of adjacent gas pipelines under the erosion action of water-sand jet
CHEN Guohua1, GUO Zichun1, ZHOU Zhihang1, CHEN Qingguang2, YUAN Zhi2

1. Institute of Safety Science & Engineering, South China University of Technology;2. Guangdong Academy of Safety and Technology

water-sand jet, erosion action, gas pipeline, Fluent, reliability

备注

为研究水砂射流冲蚀作用导致临近燃气管道的失效概率,分析了管材的临界应变与砂粒在管壁表面形成塑变脊的影响,推导出冲蚀磨损率预测方程。利用Fluent 软件模拟计算水管泄漏射流速度、冲蚀面积分布,并结合冲蚀磨损率预测方程构建冲蚀磨损速率方程。最后基于最小壁厚准则,建立了燃气管道失效概率的计算方法。研究结果表明:①通过临界间距判定分析,可获得不同水管内压、冲蚀时间下的临界间距;②增大水管内压、冲蚀时间、砂粒粒径,减少管道间距、管道壁厚均会导致燃气管道的失效概率增大,其中,管道间距对失效概率影响最为显著。研究结果可为失效场景定量风险评估以及水管与燃气管道并行敷设的间距设计提供参考。(图 10表1,参[34]

In order to study the failure probability of adjacent gas pipelines under the erosion action of water-sand jet, the influence of critical strain of pipe and plastic ridge formed by sand particles on the surface of pipe was analyzed, and the prediction equation of erosion wear rate was deduced. Then, the distribution of leakage jet rate and erosion area of water pipe was simulated and calculated by means of Fluent software, and the erosion wear rate equation was constructed based on the prediction equation of erosion wear rate. Finally, a method for calculating the failure probability of gas pipeline was established based on the criterion of minimum wall thickness. It is indicated that the critical spacing under different internal pressure and erosion time can be obtained by judging and analyzing the critical spacing. In addition, the increase of internal pressure, erosion time and sand particle size, and the reduction of pipe spacing and pipe wall thickness can increase the failure probability of gas pipeline. And among them, the effect of pipe spacing on failure probability is the most significant. The research results can provide reference for the quantitative risk assessment of failure scenario and the spacing design of water and gas pipelines laid in parallel. (10 Figures, 1 Table, 34 References)