Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (3): 62-66.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Utilization of Cryogenic Energy of LNG in Ethylene Cryogenic Separation Process

Li Ya-jun  Yin Hua   

  1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-04-01 Revised:2008-06-02 Online:2009-03-25 Published:2009-03-25
  • Contact: 李亚军（1969-），女，副教授，主要从事化工过程能量优化、天然气高效利用的研究 E-mail:liyajun@scut．edu．cn
  • About author:李亚军（1969-），女，副教授，主要从事化工过程能量优化、天然气高效利用的研究．

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Abstract:

In the conventional ethylene cryogenic separation process, the compression refrigeration system consumes a lot of cryogenic energy. In order to solve this problem, the cryogenic energy of liquefied natural gas （LNG） is applied to ethylene cryogenic separation process to reduce the compression refrigeration load. Experimental results of a ethylene cryogenic separation system with an annual output of 300kt/a indicate that the utilization rate of LNG cryogenic energy in the separation process reaches 76. 5%, and that LNG provides a cryogenic energy of 22472 kW, which results in a direct compression power saving of 11968 kW and greatly reduces the energy consumption of ethylene cryogenic separation process.

Key words: liquefied natural gas, cryogenic energy utilization, ethylene, cryogenic separation, compression refrigeration