Study on Venting Condition of Liquid-phase Ethane Transmission Pipeline
In view of the problem that ethane has low critical temperature and critical pressure and is prone to phase change during venting,the transient venting model of ethane pipeline was established to analyze the response law of ethane parameters in the pipe during the venting process.The results showed that the liquid-phase ethane pipeline emptying went through three stages,the first stage was a rapid pressure drop and the liquid-phase ethane entered the gas-liquid two-phase region.The second stage was the gas-liquid coexistence stage,in which the temperature and pressure gradually decreased along the phase envelope and the gas phase in the pipe continued to increase.In the third stage,ethane changed from all gas-liquid two-phase to gas-phase,and the temperature started to increase.The influence mechanisms of different venting pipe diameters,initial pressure and initial temperature were analyzed,and the liquid-phase ethane pipeline venting method of"large pipe diameter + stabilization time + small pipe diameter"was proposed to provide reference for the design of liquid-phase ethane pipeline venting system.
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维普
