化工进展2017，Vol.36Issue(5)：1619-1627,9.DOI:10.16085/j.issn.1000-6613.2017.05.009
一种蒸发天然气再液化氮膨胀制冷工艺流程的优化和海上适应性分析
Optimization of the process of nitrogen expansion refrigeration of BOG and the analysis of the adaptability of the sea
摘要
Abstract
In the process of transportation of large LNG transport ship,it will absorb the heat from the outside world,and make LNG to be the natural gas. In order to avoid the risk of pressure overload of the LNG transport ship,it is a preferred treatment method to re-liquefy the nature gas using re-liquefaction system. In this paper,a new type of nitrogen expansion process was simulated and the key parameters of the process were optimized. By comparing the optimized process and propane precooled mixed refrigerant refrigeration process,the paper get some conclusions. First,the unit energy consumption of LNG was regarded as the measurement index. 5 key parameters(the outlet temperature of BOG gas in the heat exchanger,the outlet pressure of the BOG first stage compressor,the nitrogen outlet temperature of the heat exchanger,the pressure of the expansion of the expander and the pressure distribution of the nitrogen compressor)were optimized to reduce the power consumption of the system. Second,compared with the propane precooling mixed refrigeration process,the nitrogen expansion process has slightly higher unit energy consumption,simpler simulation,less equipment,smaller area and more secure. Third,the selected nitrogen expansion refrigeration process was more suitable for re-liquefying on LNG transport ship than propane precooled mixed refrigerant flow.关键词
氮膨胀制冷/海上适应性分析/模拟优化/流程对比/液化天然气/蒸发天然气Key words
nitrogen expansion refrigeration/offshore adaptability/simulation and optimization/process comparison/LNG/BOG分类
通用工业技术引用本文复制引用
常学煜,张盈盈,朱建鲁,李玉星,张梦娴,杨晓宇..一种蒸发天然气再液化氮膨胀制冷工艺流程的优化和海上适应性分析[J].化工进展,2017,36(5):1619-1627,9.基金项目
国家高技术研究发展计划、海上天然气液化储存关键技术研究(2013AA09A216)、国家自然科学基金(51504278)、山东省优秀中青年科学家科研奖励基金(BS2014ZZ009)及中央高校基本科研业务费专项资金(16CX02003A)项目. （2013AA09A216）
