Modelling brittle fracture propagation in gas and dense-phase CO2 transportation pipelines
Modelling brittle fracture propagation in gas and dense-phase CO2 transportation pipelines
复制标题
DOI：
10.1016/j.ijggc.2015.12.021
复制
发表时间：
2016-03
影响因子：
3.9
通讯作者：
H. Mahgerefteh;Peng Zhang;Solomon F. Brown
中科院分区：
文献类型：
--
作者：
H. Mahgerefteh;Peng Zhang;Solomon F. Brown
开发和应用的流体-结构相互作用模型，模拟的过渡的一个贯穿壁缺陷在加压致密（150巴，283.15 K）和气相（34巴，283.15 K）CO2管道到一个运行脆性断裂。考虑到经济激励因素，断裂模型用于测试现有天然气管道的适用性，这些天然气管道具有相对较高的韧脆转变温度（0和−10 °C），用于输送CO2，以抵抗脆性断裂扩展。模拟的假设但仍然现实的场景涉及地下和地面上10公里长，0.6米内径。管道基于初始泄漏形成时周围土壤没有爆裂的假设，结果表明，与地上管道相比，埋地CO2管道中的泄漏转变为运行脆性断裂的可能性要大得多。此外，与密相管道相比，气相管道更容易发生扩展脆性断裂，尽管前者的操作压力较低。此外，与直觉相反，隔离的进料流后，发现泄漏，以促进脆性断裂故障。另一方面，初始缺陷的几何形状被证明对管道的耐传播脆性断裂有深远的影响。
The development and application of a fluid–structure interaction model for simulating the transition of a through-wall defect in pressurised dense (150 bar, 283.15 K) and gas phase (34 bar, 283.15 K) CO2pipelines into a running brittle fracture is presented. Given the economic incentives, the fracture model is employed to test the suitability of the existing stock of natural gas pipelines with the relatively high ductile to brittle transition temperatures of 0 and −10 °C for transporting CO2in the terms of their resistance to brittle fracture propagation. The hypothetical but nevertheless realistic scenarios simulated involve both buried and above ground 10 km long, 0.6 m i.d. pipelines. Based on the assumption of no blowout of the surrounding soil upon the formation of the initial leak, the results show that the transition of the leak into a running brittle fracture in buried CO2pipelines is far more likely as compared to above ground pipelines. In addition, gas phase pipelines are more prone to undergoing a propagating brittle fracture as compared to dense phase pipelines despite the lower operating pressures of the former. Furthermore, counter-intuitively, isolation of the feed flow following the discovery of a leak is shown to facilitate brittle fracture failure. The initial defect geometry on the other hand is shown to have a profound impact on the pipeline's resistance to propagating brittle fractures.