Simulation and Analysis of Cryogenic Air Separation Process with LNG Cold Energy Utilization

Y. Xiong, B. Hua
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引用次数: 12

Abstract

In this paper, a cryogenic air separation process with LNG cold energy utilization is proposed to produce liquid nitrogen and high pressure pure oxygen gas economically. To reduce the electric energy consumption of air separation products, liquid nitrogen have been produced by condensing the separated pure nitrogen gas with LNG cold energy utilization, and the recycled nitrogen is served to transfer cold energy from LNG stream to cool off air stream in the proposed cryogenic air separation process. The specifications of streams and the major equipments of the air separation process are simulated with Aspen Plus software and the main parameters analysis are performed. The results show that the energy consumption of the proposed air separation process with LNG cold energy utilization decreased about 58.2% compared with a conventional cryogenic air separation process. The compressed pressure of recycled nitrogen has a big impact on the cost of air separation products and utilization efficiency of LNG cold energy. The LNG cold energy could be fully utilized when the recycled nitrogen has been compressed to above 6.5MPa.
LNG冷能利用的低温空分过程模拟与分析
本文提出了利用LNG冷能的低温空分工艺,经济地生产液氮和高压纯氧。为了降低空分产品的电能消耗,利用LNG冷能将分离后的纯氮气冷凝生成液氮,回收的氮气用于将LNG流中的冷能传递给冷却气流,实现低温空分工艺。利用Aspen Plus软件对空分工艺流程及主要设备的工艺参数进行了仿真,并对主要参数进行了分析。结果表明,与传统低温空分工艺相比,采用LNG冷能的空分工艺能耗降低约58.2%。再生氮气的压缩压力对空分产品的成本和LNG冷能的利用效率影响较大。当回收氮气压缩到6.5MPa以上时,LNG冷能可以得到充分利用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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