A system and method for safe operation of liquid ethane pipeline pigging and collecting balls

Abstract

The invention discloses a system and method for safe operation of liquid ethane pipeline pigging and collecting balls. The system includes a main system for ethane transportation and pigging and collecting balls, an ethane safe filling system, an ethane forced flow system and instrument monitoring system; the main system of ethane delivery and pigging collection includes a normal flow pipeline and a pigging collection pipeline, and the pigging collection pipeline is connected with the pigging collection cylinder; the ethane safe filling system includes a replacement A pressure charging unit and a liquid-taking and charging pipeline; the ethane forced flow system includes an ethane forced flow pipeline. Based on the phase characteristics of ethane and the installation and operation characteristics of the pigging tube, the invention recognizes that when the pigging tube is serving in a liquid ethane pipeline, low temperature caused by pressure and high temperature caused by long-term no internal flow may occur. For practical problems, consider adding measures such as an ethane safe filling system, an ethane forced flow system, and an instrument monitoring system to the conventional liquid medium pigging tube to ensure the safe and reliable operation of the ethane pigging tube.

Description

technical field [0001] The invention belongs to the technical field of liquid ethane pipeline transportation, and in particular relates to a system and method for safe operation of liquid ethane pipeline pigging and collecting balls. Background technique [0002] In recent years, with the development of natural gas condensate recovery technology and the increasing demand for efficient energy utilization, the natural gas ethane recovery market has expanded rapidly. Ethane is a good chemical raw material with extremely high utilization value. Pipeline transportation is an effective way to connect ethane production and utilization; liquid transportation is the main operation mode of ethane pipeline transportation, which is characterized by high efficiency and economy. The critical temperature of ethane is 32°C, and the critical pressure is 4.5MPa.g. The ethane content of commercial ethane in pipeline transportation exceeds 95mol%. Ethane has typical low-pressure gasification ...

AI Technical Summary

Problems solved by technology

Furthermore, since the pigging tube and supporting pipelines are set in the open air, and there is no medium passing through for a long time, affected by the heat radiation of the environment, the surface and internal temperatures are extremely high during the day in summer. The liquid ethane discharged from the underground pipeline can easily cause the temperature of the liquid ethane to increase sharply and exceed the critical temperature, which will cause great difficulties and safety hazards to the stable operation of the downstream; at the same time, if the exposed pipeline is filled with ethane and For pipes or equipment with closed ends, there is a problem that the medium is affected by the environment and the temperature rises, resulting in a large increase in pressure, which poses a safety risk

[0005] The above problems are rarely mentioned in the current related research, and the related liquid ethane transportation technology is also hard to find public reports in my country

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