维持LNG冷能空分装置连续运行的方案研究  

A study on the schematic design for maintaining continuous operation of the LNG cold energy air separation unit

作　　者：魏林瑞[1] 江克忠[1] 李亚军[2] 

机构地区：[1]中海油能源发展股份有限公司,北京100000 [2]华南理工大学传热强化与过程节能教育部重点实验室,广州510641

出　　处：《低温与超导》2015年第3期11-17,共7页Cryogenics and Superconductivity

摘　　要：LNG(液化天然气)蕴含的冷能应用于空气分离,既节约了传统空分大量的压缩制冷功耗,同时也满足了日益增长的气体需求。由于接收站LNG的气化量在不同时段和不同季节因用户的用气波动而频繁变化,致使LNG冷能空分装置因冷量中断而被迫频繁停车,冷能空分项目的连续稳定运行受到了一定的制约。针对此问题,提出了利用液氮冷媒补冷,维持空分装置连续运行的方案,研究结果表明:LNG冷能供应中断时,通过利用液氮冷媒补冷可维持空分装置连续运行,相比较空分装置直接停车再冷开车,该方案经济上切实可行。LNG cold energy can be applied to air separation,which not only saves a great deal of air compression refrigeration power consumption compared with the traditional way,but also meets the growing demand of natural gas. The LNG output load fluctuates between peak and valley due to the user＇s gas fluctuation in different times and different seasons. Commonly,the LNG output load reaches the valley at night,sometimes even decreases to zero. Accordingly,the air separation unit by using LNG cold energy is forced to stop frequently because of the interruption of cold energy,thus restraining the continuous and stable operation of air separation unit. In order to maintain continuous operation of air separation unit,the liquid nitrogen was used to supply cold energy,which could reduce the damage to the air separation equipments and economic benefits caused by the on-off frequently. The results show that using 14. 5t / h liquid nitrogen can maintain continuous operation of air separation unit when LNG cold energy supply interrupts. Compared with on-off frequently until the production is resumed,the project is economically feasible. Furthermore,when the LNG cold energy supply interruption continues a long time,variable load operation can be taken to reduce the consumption of liquid nitrogen.

关 键 词：LNG冷能 空分装置 波动 液氮 连续运行 

分 类 号：TQ116.11[化学工程—无机化工]