Liquid ethane conveying pipeline pressure protection system and method

A technology for transmission pipelines and protection systems, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as increased pipeline costs, increased difficulty and cost of storage tank manufacturing, and few researches on water hammer release , to achieve the effect of eliminating fire prevention, saving manpower, and eliminating water hammer overpressure
CN108317398APending Publication Date: 2018-07-24CHINA PETROLEUM ENG & CONSTR +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM ENG & CONSTR
Publication Date
2018-07-24

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Abstract

The invention discloses a liquid ethane conveying pipeline pressure protection system and method. The system comprises forward pressure relief systems and reverse pressure relief systems which are arranged in parallel on trunk line pumps or valve bypasses. According to the system and the method, the pump or valve front pressure increment caused by action of the pumps or trunk line valves in a liquid ethane pipeline or the isolation section pressure increment caused by temperature rise is automatically released into adjacent upstream and downstream trunk lines by stimulating relief devices arranged on the pumps of the valve bypassed so as to prevent overpressure mediums from entering the atmosphere and limit the highest operating pressure of each pipe section. The system and the method havethe advantages that the water hammer overpressure problem under transient operation of a pipeline can be solved, the influence on the strength of the pipeline due to the volume change caused by influence of the temperature of the mediums after shutdown of the pipeline can be avoided, the overpressure mediums are not discharged from the system after being released, and therefore the investment ofaccessory facilities are reduced, and the safety, environmental protection and energy conservation effects can be achieved.
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Description

technical field

[0001] The invention relates to a pressure protection system and method for a liquid ethane delivery pipeline. Background technique

[0002] In recent years, the oil and gas exploration and petrochemical industries have developed rapidly, the condensate gas fields have been vigorously developed, the extraction technology of natural gas auxiliary products has been continuously developed, and the sources, processing and sales of natural gas liquids (NGL) have increased day by day.

[0003] The chemical composition of liquid ethane is mainly methane, ethane and propane, among which the mole fraction of ethane can reach about 95%. A typical liquid ethane mixture has a very low bubble point (<-80°C, under normal pressure), and a critical temperature of about 25-35°C, so it is very easy to vaporize after leakage. Liquid ethane has a large latent heat of evaporation and absorbs a large amount of heat when volatilized, which may easily cause frostbite to people i...

Claims

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