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公开(公告)号：US5934104A
公开(公告)日：1999-08-10
申请号：US88993
申请日：1998-06-02
CPC分类号： F25J3/04872 , F25J3/04224 , F25J3/04284 , F25J3/04303 , F25J3/04321 , F25J3/04351 , F25J3/04442 , F25J3/04454 , F25J2200/20 , F25J2200/34 , F25J2200/50 , F25J2200/54 , F25J2215/52 , F25J2215/56 , F25J2235/42 , F25J2245/50 , F25J2250/20 , Y10S62/90
摘要： The present invention is an improvement to a nitrogen generator enabling the process to efficiently coproduce oxygen with low recovery, typically less than 70% and preferably less than 55%, in addition to the primary product, nitrogen. In the nitrogen generator process, air is distilled in a distillation column system having a higher pressure column and a lower pressure column. The feed air is compressed, treated to remove water and carbon dioxide, cooled to near its dew point and fed to the higher pressure column of the distillation column system. The nitrogen product is produced by removing an overhead vapor stream from at least one of the columns of the distillation column system. At least one oxygen-enriched stream is removed from the lower pressure column. The improvement is characterized in that: (a) the oxygen-enriched stream is removed from the lower pressure column at a location that is at or below the feed to the lower pressure column; (b) feeding the removed oxygen-enriched stream to a supplemental distillation column for separation into an oxygen bottoms and a waste overhead; (c) providing boilup to the supplemental distillation column and (d) removing an oxygen stream (vapor or liquid) from the bottom of the supplemental distillation column as an oxygen product.
摘要翻译： 本发明是对氮气发生器的改进，使得该方法除了主要产物氮之外，能够以低回收率（通常小于70％，优选小于55％）有效地共生氧气。 在氮气发生器过程中，在具有较高压力塔和低压塔的蒸馏塔系统中蒸馏空气。 进料空气被压缩，处理以除去水和二氧化碳，冷却到接近其露点并进料到蒸馏塔系统的高压塔中。 通过从蒸馏塔系统的塔中的至少一个塔除去顶部蒸汽流来生产氮气产物。 从低压塔中除去至少一个富氧流。 其改进的特征在于：（a）在低压塔的进料处于或低于低压塔的进料位置，从低压塔中除去富氧料流; （b）将去除的富氧物流送入补充蒸馏塔以分离成氧底部和废物塔顶; （c）向补充蒸馏塔提供煮沸和（d）从补充蒸馏塔的底部除去作为氧产物的氧气流（蒸汽或液体）。
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