Transportation of Carbon Dioxide (CO₂) is an essential part of Carbon Capture and Storage (CCS) chain. Transportation using pipelines is known as one of the most economical ways for large-quantity of CO₂. In CCS projects, it is very important to ensure the safe operation of the CO₂ pipelines. Thus in the design stage, the risk associated with CO₂ pipelines should be identified. This paper reports a method of Quantitative Risk Assessment (QRA) for the possible release of supercritical CO₂ (scCO₂) pipelines, including the individual risk and social risk. In this method, the data of failure frequency was summarized and the failure frequency suitable for CO₂ pipelines was modified based on the effect of third-party activities. Furthermore, the fatal length was introduced to describe the integrated fatality along the pipeline. A two-phase model for CO₂ release and a modified Gaussian plume model for CO₂ dispersion were used to obtain the release consequences in CO₂ pipeline QRAs for the first time. The results show that the modified failure frequencies of a full-bore rupture and a puncture are both 2.32 × 10⁻⁴ km⁻¹ year⁻¹. To demonstrate the method, a QRA case based on a hypothetical accident release of a scCO₂ pipeline was presented. The QRA model proposed provides a potential framework to determine the safe distance of CO₂ pipelines.

二氧化碳 (CO ₂ ) 的运输是碳捕集和封存 (CCS) 链的重要组成部分。使用管道进行运输被认为是大量 CO ₂最经济的方式之一。在CCS项目中，保证CO ₂管道的安全运行非常重要。因此，在设计阶段，应识别与 CO ₂管道相关的风险。本文报告了一种定量风险评估 (QRA) 方法，用于可能释放超临界 CO ₂ (scCO ₂ ) 管道，包括个人风险和社会风险。该方法总结了失效频率数据，得出了适合CO ₂的失效频率。管道根据第三方活动的影响进行了修改。此外，还引入了致命长度来描述管道沿线的综合死亡率。CO ₂释放的两相模型和CO ₂扩散的修正高斯羽流模型首次用于获得CO ₂管道QRA 中的释放后果。结果表明，修正后的全孔破裂和刺穿失效频率均为2.32 × 10 ^-4  km ^-1 年^-1。为了演示该方法，一个基于 scCO ₂假设事故释放的 QRA 案例提出了管道。提出的 QRA 模型提供了一个潜在的框架来确定 CO ₂管道的安全距离。