Re-liquefying method for shipping liquefaction ethylene/ethane vaporized gas

A technology for evaporating gas and liquefying ethylene, applied in liquefaction, refrigeration, liquefaction, solidification, etc.
CN101392980BInactive Publication Date: 2010-09-01SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2010-09-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a reliquefying method for shipped liquefied ethylene / ethane vapor. The method comprises the following steps of two stage compression of the ethylene / ethane vapor, successive cooling of the ethylene / ethane vapor by seawater and a refrigerant, phase-change latent heat cooling of ethylene / ethane, and re-liquefied storage of the ethylene / ethane vapor in a tank. The method utilizes phase-change latent heat of the ethylene / ethane and the refrigerant for heat exchange, supplies the cooling capacity through cycle refrigeration of the refrigerant, and re-liquefies and recoversthe ethylene / ethane vapor. In the refrigeration cycle of the method, low-temperature return flow is mixed and returned to a cold box so as to cool the refrigerant, so that the method fully utilizes the cooling capacity of the return flow, and improves the recovery utilization rate of energy; and the temperature difference of seawater of the technological method before and after heat exchange accords with the environmental protection rule.
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Description

technical field

[0001] The invention relates to the technical field of reliquefaction of boil-off gas (BOG) of liquefied petrochemical products, and specifically refers to a method for reliquefaction of BOG generated by heat during transportation and unloading when liquefied ethylene or ethane is shipped. Background technique

[0002] The ethylene industry is a symbol to measure the scale and development of a country's petrochemical industry. No matter whether it is a developed country or a developing country, all conditions will try their best to promote the construction and development of the ethylene industry. With the sustained and rapid development of my country's petrochemical industry and national economy, the demand for ethylene continues to increase. In 2007, my country's ethylene consumption was 21.69 million tons, while ethylene production was 10.47 million tons, and the self-sufficiency rate was only 48.3%. It is estimated that my country's ethylene production c...

Claims

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