Thermodynamic and hydraulic characteristics of hot oil pipeline under the intermittent transportation process
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Abstract
The intermittent transportation process is one of the methods to deal with the low-throughput issue for the oil transportation pipeline with complicated thermodynamic and hydraulics characteristics. Physical and mathematic models special for the intermittent transportation process for waxy oil pipeline are built and numerical simulation is carried out. The thermal and hydraulic characteristic of the pipeline is analyzed based on the simulation results. The analysis results show that inlet temperature and hydraulic drag loss between the stations both change periodically. The ratio of shutdown and running time are key factors influencing the thermal characteristics of pipeline. When the ratio of running time to shutdown time is the same, the longer the cycle running time is, the wider the fluctuation range of temperature is; when transportation time is the same, the higher the ratio of running time to shutdown time is, the narrower the fluctuation range of temperature is, and the higher the maximum restorable temperature for inlet temperature is at transportation stage. A calculation case shows that the inlet temperature difference for every pump station is no more than 1 ℃ in the condition of the intermittent transportation program with the same ratio of running time to shutdown time at a 2-to-6-day transportation time.
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