leistungsersparnisse for gastrennung in teillastbetrieb

摘要

Cryogenic gas separation to provide product (105,106) at design pressure is selectively operated at design flow or at turndown, especially at greater than 30% turndown (less than 70% design flow), by suction throttling (10) the supply feed compressor (1) at turndown to reduce the supply feed (102) pressure to the distillation column system (3,4,5,6) and operating the system at sufficiently reduced product (105,106) recovery to maintain the product pressure. Preferably, the compressor (1) has variable angle guide vanes permitting up to 30% turndown before suction throttling (10) the compressor (1) to allow greater turndown without compressor surge. The arrangement has particular application to dual column nitrogen generators. IMAGE