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Novel cryogenic argon recovery from the air separation unit integrated with LNG regasification and CO2 transcritical power cycle
Sustainable Energy Technologies and Assessments ( IF 8 ) Pub Date : 2020-06-16 , DOI: 10.1016/j.seta.2020.100767
Mehdi Mehrpooya , Behrooz Golestani , S.M Ali Mousavian

Two novel air separation units at cryogenic temperature were proposed to reach high purity nitrogen, oxygen, and argon. The first process refers to a three-column cryogenic air separation plant without using an external refrigeration system. An integrated process including cryogenic air separation, combined-cycle power plants (e.g., transcritical CO2 cycle and gas turbine), and LNG regasification was presented and analyzed as the second process to produce liquid oxygen and vaporize LNG without using external refrigeration source. Results of the first proposed process demonstrate that the specific energy consumption of high purity nitrogen, oxygen, and argon reduces to 18.7%, 13%, and 12% respectively when compared with the conventional processes. Specific energy consumptions and exergy efficiency for the second plant improved by nearly 33% and 16% in comparison with the first process. Also, the gas turbine and CO2 power cycle efficiencies were almost 35% and 45% in the second process. Exergy analysis on both systems demonstrated that expansion valve V-2 (99.42%), high-pressure distillation columns (99.41%), and argon recovery section (98.34%) have the lowest irreversibility and highest exergy efficiency. Meanwhile, the highest exergy destructions in the first and second proposed plants belong to the low-pressure distillation tower of the first process and the combustion chamber of the second process with around 3400 kW and 24,000 kW respectively.



中文翻译:

从空气分离装置中回收新型低温氩气,并结合了LNG再气化和CO 2跨临界功率循环

提出了两种在低温下的新型空气分离装置,以达到高纯度的氮气,氧气和氩气。第一个过程是指不使用外部制冷系统的三塔低温空气分离设备。包括低温空气分离,联合循环发电厂(例如,跨临界CO 2循环和燃气轮机),并分析和分析了液化天然气的再气化,这是不使用外部制冷源而生产液氧和气化液化天然气的第二个过程。首次提出的方法的结果表明,与常规方法相比,高纯度氮气,氧气和氩气的单位能耗分别降低到18.7%,13%和12%。与第一过程相比,第二工厂的单位能耗和火用效率分别提高了近33%和16%。另外,燃气轮机和CO 2在第二个过程中,电源循环效率几乎达到35%和45%。两个系统的火用分析表明,膨胀阀V-2(99.42%),高压蒸馏塔(99.41%)和氩气回收段(98.34%)具有最低的不可逆性和最高的火用效率。同时,提议的第一工厂和第二工厂中最大的火用破坏分别属于第一过程的低压蒸馏塔和第二过程的燃烧室,分别约为3400 kW和24,000 kW。

更新日期:2020-06-16
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