RESEARCH ARTICLE

A simplified model of direct-contact heat transfer in desalination system utilizing LNG cold energy

  • Qingqing SHEN ,
  • Wensheng LIN ,
  • Anzhong GU ,
  • Yonglin JU
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  • Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 02 Jan 2011

Accepted date: 13 Dec 2011

Published date: 05 Jun 2012

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

With the increasingly extensive utilization of liquefied natural gas (LNG) in China today, sustainable and effective using of LNG cold energy is becoming increasingly important. In this paper, the utilization of LNG cold energy in seawater desalination system is proposed and analyzed. In this system, the cold energy of the LNG is first transferred to a kind of refrigerant, i.e., butane, which is immiscible with water. The cold refrigerant is then directly injected into the seawater. As a result, the refrigerant droplet is continuously heated and vaporized, and in consequence some of the seawater is simultaneously frozen. The formed ice crystal contains much less salt than that in the original seawater. A simplified model of the direct-contact heat transfer in this desalination system is proposed and theoretical analyses are conducted, taking into account both energy balance and population balance. The number density distribution of two-phase bubbles, the heat transfer between the two immiscible fluids, and the temperature variation are then deduced. The influences of initial size of dispersed phase droplets, the initial temperature of continuous phase, and the volumetric heat transfer coefficient are also clarified. The calculated results are in reasonable agreement with the available experimental data of the R114/water system.

Cite this article

Qingqing SHEN , Wensheng LIN , Anzhong GU , Yonglin JU . A simplified model of direct-contact heat transfer in desalination system utilizing LNG cold energy[J]. Frontiers in Energy, 2012 , 6(2) : 122 -128 . DOI: 10.1007/s11708-012-0175-0

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