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介绍了一种利用液化天然气(LNG)冷量用于空气分离的流程,并采用模拟软件Asp-en Plus对整个流程进行了模拟与分析.计算结果表明,利用LNG冷量的空分装置,单位液体空分产品的生产能耗由传统装置的1.000 kW.h.kg-1降低至0.300 kW.h.kg-1,节能效果显著.LNG经空气分离装置回收利用冷量后,其温度仍然很低,剩余的冷量可继续用于低温粉碎和冷库等项目.作者对空气分离流程中的主要设备进行了模拟分析,并且分析了循环氮气被压缩至不同的压力对单位空分产品能耗的影响,结果表明,循环氮气压缩的压力越高,则LNG的用量越少,但单位液体空分产品的能耗基本不变.
This paper introduces a process of using LNG cold for air separation, and simulates and analyzes the whole process with simulation software Asp-en Plus.The calculation results show that the air separation unit using LNG cold capacity, unit The production energy consumption of liquid air separation products is reduced from 1.000 kW.h.kg-1 to 0.300 kW.h.kg-1 in traditional installations, resulting in significant energy saving effect.LNG still has a very high temperature after it is recycled by the air separation plant Low, the remaining cold can continue to be used for items such as low temperature crushing and cold storage etc. The author has carried on the simulation analysis to the main equipment in the air separation process, and has analyzed the cycle nitrogen is compressed to the different pressure to the unit air separation product energy consumption The results show that the higher the pressure of cyclic nitrogen compression, the less the amount of LNG, but the energy consumption per unit of liquid air separation products basically unchanged.