一种利用LNG冷能的空气分离装置新流程

本文介绍了一种利用LNG冷能的空分装置新流程,其特征在于采用了由LNG冷能冷却的氮气内循环和氮气外循环低温压缩节流制冷系统、LNG的余冷冷却的氟里昂为载冷剂的压缩空气冷却系统和两段式LNG与循环氮气的热交换器。对不同工况的计算结果显示,生产每公斤液氧的能耗比不用LNG法节电60％-73.5％,理论上的节能效果优于在查阅文献和专利的其它方案。

A NEW AIR SEPARATION SYSTEM BY USING COLD ENERGY OF LNG

A new air separation system by using cold energy of LNG was introduced in this paper. The main features of the system include: an inner nitrogen cycle cooled by cold energy of LNG and an outer nitrogen cycle cooled by a cryogenic compression refrigeration system are applied, the compressed air is pre-cooled by a freon coolant cooled by residual cool energy of LNG, and a twin zone heat exchanger between LNG and cycled nitrogen is applied. Simulation results based on different work conditions showed that the consumed electric energy produced 1 kg liquefied oxygen can be saved 60%-73.5% by the new system compared with conventional air separation systems without LNG, and the energy saving effectiveness is better than that of any method presented by other patents.