热油管道石蜡沉积层的力学特性研究

Research on Mechanical Characteristics of Wax Deposition in Hot Oil Pipelines

研究了热油管道石蜡沉积层的形态和物质组成,分析了爬坡管道石蜡沉积层微元在停输前后的二维受力情况。爬坡管道停输后,石蜡沉积层受力不平衡,随停输时间的延长,在重力差的作用下,石蜡沉积物结构发生破坏,并向低端滑移和聚集,导致再启动困难。为了使低输量运行热油管道的石蜡沉积层处于临界厚度,必须定期清管,以降低管道停输再启动过程的运行风险。

Form and composition of wax deposition in hot oil pipeline are studied and two dimensional stress of wax deposition' s infinitesimal in climbing pipeline around its shut-down is analyzed. After climbing pipeline shuts down, stress of wax deposition is at imbalance, and with the extension of shut-down time, structure of wax deposition is destroyed and drifts to low side of pipelineand aggregates together by the action of gravity difference function, which makes restart-up of pipeline difficult. Therefore, in order to keep wax deposition layer at critical thickness for the hot oil pipeline operated at low throughput, regular pigging must be carried out so as to reduce operation risk during pipeline shut-down and restart-up process.