Method of cryogenic separation for light hydrocarbons on the basis of LNG (liquefied natural gas) cold energy

A technology for cryogenic separation and light hydrocarbons, which is applied in the field of cryogenic separation of light hydrocarbons based on LNG cold energy, and the separation of light hydrocarbon mixtures in refinery, which can solve the problems of large power consumption, save resources and reduce power consumption of compression , the effect of reducing energy costs
CN103398546AInactive Publication Date: 2013-11-20SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2013-11-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method of cryogenic separation for light hydrocarbons on the basis of LNG (liquefied natural gas) cold energy. The method includes: simulating to calculate cold energy allocation provided by a three-unit compression refrigerating system according to the traditional process of cryogenic separation for light hydrocarbons; determining according to the calculated cold energy and the actual conditions to use the cold energy provided by LNG to replace completely or partially the cold energy provided by the three-unit compression refrigerating system, thus determining usage of the LNG to obtain operation conditions of process flow of the cold energy that can be provided by the LNG in the traditional process of cryogenic separation for light hydrocarbons; according to operation conditions of a heat exchanger network using the LNG as a cold source and the process flow as a cold trap and according to Aspen Plus and Aspen Pinch simulation, synthetizing a heat exchanger network map, and determining the sequence of cold energy provision using the LNG as process flow; in the traditional process of cryogenic separation for light hydrocarbons, replacing completely or partially the three-unit compression refrigerating system with the LNG, and providing the cold energy to the process flow according to the sequence so as to complete the cryogenic separation of light hydrocarbons. The method has the advantages that compression refrigeration energy consumption in the process of light hydrocarbon separation can be saved and LNG gasification cost can be reduced.
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Description

Technical field

[0001] The invention relates to a method for separating light hydrocarbon mixtures in refining and petrochemical industries, in particular to a method for light hydrocarbon cryogenic separation based on LNG cold energy. It belongs to the field of light hydrocarbon mixture separation. Background technique

[0002] Liquefied Natural Gas (LNG for short) is a low temperature liquid at -162°C. It needs to be gasified and heated to above 0°C before being supplied to downstream users. Most LNG receiving stations use open shelves The seawater vaporizer and submerged combustion vaporizer are used to heat and vaporize LNG. When 1.0t LNG is vaporized, approximately 230kWh of cold energy can be released, causing a great waste of energy. LNG cold energy can be used in processes such as air separation, power generation, cryogenic smashing, cold storage, light hydrocarbon separation, dry ice production, etc. If the cold energy of LNG is recycled, it can replace a large amount o...

Claims

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