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LNG是一种多组分混合物,外界环境的漏热会引发诸多问题,影响管输的安全性和经济性。了解漏热状态下LNG蒸发率和压力的变化规律,对LNG管道设计和管理具有重要的理论意义。基于LNG管道输送过程中保温层厚度、LNG气化率、管道壁厚之间的变化规律,采取冷态输送法,通过采用合理的保温层厚度控制LNG的蒸发,从而使管内压力升高,以此推动LNG向前流动,从而优化管输工艺。建立了LNG管输优化的经济数学模型,计算获得系统的最佳气化率以及最佳管壁和保温层厚度,从而优化了管输系统的经济费用。实例计算验证了该模型和计算程序的工程应用价值。
LNG is a multi-component mixture, the external environment, the heat leak will lead to many problems that affect the safety of pipe transport and economy. Knowing the variation law of LNG evaporation rate and pressure under the condition of heat leakage has important theoretical significance for the design and management of LNG pipeline. Based on the variation law of insulation layer thickness, LNG gasification rate and pipe wall thickness during the transportation of LNG pipeline, a cold conveying method was adopted to control the evaporation of LNG by adopting a reasonable thickness of insulation layer to increase the pressure in the pipe to This pushes the LNG forward to optimize the tube transport process. The economic mathematic model of LNG pipe transportation optimization is established, the optimal gasification rate of the system and the optimal pipe wall and insulation thickness are calculated, so as to optimize the economic cost of the pipe transportation system. The case calculation verifies the engineering value of the model and calculation program.