吸收塔模拟气体进料位置为什么为N+1？ 从aspen 帮助查的，楼主可查找一下。 有图解释 when the feed convention is above-stage, radfrac introduces a material stream between adjacent stages. the liquid portion flows to the stage you specify. the vapor portion flows to the stage above. you can introduce a liquid feed to the top stage (or condenser) by specifying stage=1. you can introduce a vapor feed to the bottom stage (or reboiler) by specifying stage= ns + 1, where ns is the number of equilibrium stages. if you introduce a feed above stage 1 and there is no condenser, it is equivalent to introducing the feed on stage 1 (both liquid and vapor will enter stage 1). if you introduce a feed above stage ns + 1 and there is no reboiler, it is equivalent to introducing the feed on stage ns (both liquid and vapor will enter stage ns). when you are performing sizing calculations, you should not use above-stage feeds; aspen plus will warn you if you try. the reason is because the above-stage convention sends the vapor directly to the stage above the feed, making the vapor flow rate between the feed stage and the stage above lower than it would be with an on-stage feed. if this feed stage is the limiting one, specifying an above-stage feed will result in an undersized tower.查看更多
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