An innovative vortex-tube turbo-expander refrigeration cycle for performance enhancement of nitrogen-based natural-gas liquefaction process

被引:33
|
作者
Qyyum, Muhammad Abdul [1 ]
Wei, Feng [1 ]
Hussain, Arif [1 ]
Noon, Adnan Aslam [2 ]
Lee, Moonyong [1 ]
机构
[1] Yeungnam Univ, Sch Chem Engn, Gyongsan 712749, South Korea
[2] Int Islamic Univ, Dept Mech Engn, FET, Islamabad 44000, Pakistan
基金
新加坡国家研究基金会;
关键词
Natural gas liquefaction; LNG; N-2; expander; Vortex tube; Hybrid vortex tube and turbo expander; ENERGY-EFFICIENT; OPTIMIZATION; SINGLE; PARAMETERS; TEMPERATURE; SEPARATION;
D O I
10.1016/j.applthermaleng.2018.08.023
中图分类号
O414.1 [热力学];
学科分类号
摘要
Liquefied natural gas (LNG) has attracted global attention as a more ecological energy source when compared to other fossil fuels. The nitrogen (N-2) expander liquefaction is the most green and safe process among the different types of commercial natural gas liquefaction processes, but its relatively low energy efficiency is a major issue. To solve this issue, an energy-efficient, safe, and simple refrigeration cycle was proposed to improve the energy efficiency of the N-2 based natural-gas liquefaction process. In the proposed refrigeration cycle, vortex tube as an expansion device was integrated with turbo-expander in order to reduce the overall required energy for LNG production. A well-known commercial simulator Aspen Hysys (R) v9 was employed for modeling and analysis of proposed LNG process. The hybrid vortex-tube turbo-expander LNG process resulted in the specific energy requirement of 0.5900 kWh/kg LNG. Furthermore, the energy efficiency of the proposed LNG process was also compared with previous N-2 expander-based LNG processes. The results demonstrated that the proposed hybrid configuration saved up to 68.5% (depending on feed composition and conditions) in terms of the overall specific energy requirement in comparison with previous studies.
引用
收藏
页码:117 / 125
页数:9
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