Yu Pengfei, Lei Yun, Gao Yuming, Peng Haoping, Deng Song, Liu Yang, Lv Xiaofang, Zhao Huijun
Jiangsu Key Laboratory of Oil and Gas Storage & Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China.
ACS Omega. 2020 Dec 16;5(51):33340-33346. doi: 10.1021/acsomega.0c05140. eCollection 2020 Dec 29.
When the hot oil pipeline is running at a low throughput, it easily enters into an unstable condition, which seriously threatens the safety of the hot oil pipeline operation. In this study, the unsteady heat transfer and flow mathematical models for the hot oil pipeline system were established first by comprehensively considering the uncertainty of parameters during pipeline operation, such as the operating parameters (throughput and oil temperature), physical properties of crude oil (freezing point, viscosity, and thixotropic parameters), and environmental parameters (buried deep soil temperature and soil thermal conductivity). Then, the efficient Latin hypercube sampling (LHS) stochastic numerical algorithm was applied and further developed to quantitatively describe the operation safety of hot oil pipelines with low throughput in the form of probability. On the basis of the abovementioned research, the qualitative relationship between pipeline flowrate and friction loss is obtained. Finally, taking an actual crude oil pipeline as an example, the failure probabilities of the pipeline under different operating conditions were analyzed in detail. Combined with the target safety level of pipeline operation, the minimum allowable throughput of pipelines was determined. This study revealed the flow and heat transfer law of hot oil pipelines with low throughput and determined its operation safety and reliability under different operating conditions.
当热油管道以低输量运行时，很容易进入不稳定状态，这严重威胁热油管道运行的安全性。在本研究中，首先通过综合考虑管道运行过程中参数的不确定性，如运行参数（输量和油温）、原油物性（凝固点、黏度和触变参数）以及环境参数（埋深土壤温度和土壤导热系数），建立了热油管道系统的非稳态传热与流动数学模型。然后，应用并进一步发展了高效拉丁超立方抽样（LHS）随机数值算法，以概率形式定量描述低输量热油管道的运行安全性。基于上述研究，得到了管道流量与摩擦损失之间的定性关系。最后，以某实际原油管道为例，详细分析了管道在不同运行工况下的失效概率。结合管道运行的目标安全水平，确定了管道的最小允许输量。本研究揭示了低输量热油管道的流动与传热规律，并确定了其在不同运行工况下的运行安全性和可靠性。
