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在长输管道中,管内气相的存在给管道工况分析和控制增加了困难,而且也是引起事故的原因。在建立负压汽化管段数学模型的基础上,对管道在负压汽化后压力波动时的汽化量、其随压力变化的规律、气体吸收、气泡消失等问题进行了试验和理论探讨。模拟结果分析表明,数学模型和解决问题的方法较之于集中空穴模型(液柱分离)更符合原油管道负压汽化时所产生的压力流量波动。将平衡汽化曲线用于描述管道的负压汽化过程。
In long-distance pipelines, the presence of gas in the pipe increases the difficulty in analyzing and controlling pipeline conditions and is also responsible for the accident. Based on the establishment of the mathematical model of the negative pressure vaporization tube section, experiments and theoretical discussions are made on the vaporization amount of the pipeline under the pressure fluctuation after the negative pressure vaporization, the law of the pressure variation, the gas absorption and the bubble disappearance. The simulation results show that the mathematical model and the method of solving the problem are more in line with the pressure flow fluctuations caused by the negative pressure vaporization of the crude oil pipeline than the centralized hole model (liquid column separation). The equilibrium vaporization curve is used to describe the pipeline’s vacuum evaporation process.