空分设备在天然气输送工艺中余压和冷量的回收利用

The air separation system by using cold energy of LNG and natural gas pressure energy

介绍在天然气输送过程中的管道余压和LNG的冷量在空分上的利用,用热力学方法对其进行可行性研究,同时介绍利用余压和冷量的空分流程:让高压天然气逐级膨胀将压力降到中压后,产生的冷量再通过空分的主换热器,中压再进一步膨胀到低压范围后,产生的冷量补入空分的循环氮气;分析对比已有的利用LNG冷能的空分流程,指出由LNG冷能冷却的氮外循环和主换热器制冷系统,用来补充空分系统工艺中所需的冷量,以及由乙二醇为载冷剂把LNG残余冷量带入空分的空气冷却系统较为合理。讨论天然气余压和冷能回收实施过程中存在的问题。

Some kinds of air separation system by using nature gas pressure energy and LNG cold energy was introduce,and use thermodynamic to analysis the feasibility study,also describe the detail of the several kinds of air separation system by using cold energy of LNG and natural gas pressure energy,let high-pressure pipe natural gas has to be integrated decompressed into medium-pressure and low-pressure,a large amount of clod energy is generated then bring into the Primary System Heat Exchanger and cycle nitrogen;and this article make an analysis and a comparison between the air separation systems by using cold energy of LNG,indicate the outer nitrogen cycle and Primary System Heat Exchanger cooled by cold energy of LNG,and the compressed air is pre-cooled by Glycol in cold agent by residual cool energy of LNG are more reasonable,and debate the existing problems in the process of implementing.