共查询到18条相似文献,搜索用时 171 毫秒
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不设提馏段的精馏回流比 总被引:2,自引:0,他引:2
对不设精馏段的精馏塔,塔釜是轻组分的恒浓区。当轻组分作为产品,对塔釜进行物料衡算,且只需对釜液中的轻组分作汽液平衡试验,即可求出操作回流比。不存在操作回流比对最小回流比R_(?)的优化问题。本方法也适用于多组分和一些特殊精馏。其理论计算值与试验结果吻合。 相似文献
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<正> 概 述 本文对二元精馏系统采用几次多项式y=a_nx~n+a_(n-1)x~(n-1)+……+a_o拟合气液平衡曲线,由多项式与操作线或进料线方程联解求出恒浓区,最后求出最小回流比。此方法用BASIC语言编制程序,可在各种微机上进行计算。 相似文献
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在文献[1—6]所叙述的单股进料多组份精馏塔的最小回流比的确定方法,已不再通用于塔中有两股或更多股进料,在这篇文章中,我们将系统地导出求解多股进料塔的最小回流比的方法。当蒸馏塔回流比D/L从全回流减小,每个进料段能产生一个恒浓区,对于一个具有两股进料的塔(如图所示),假使回流能无限制的减小,就将有两个恒浓区。 相似文献
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多储罐动态全回流分离方法 总被引:1,自引:1,他引:0
多储罐间歇精馏是新型操作方式,目前仅用于多组分混合物分离.为了扩大多储罐间歇精馏塔的应用,将其用于2组分物系的分离,提出了多储罐动态全回流分离方法.其特点是可分为全回流提浓和倒罐采出阶段,这2个阶段交替进行,直到分离结束.建立了该过程的数学模型,并与常规恒回流比方式比较,结果表明:动态全回流方法省时.进一步通过乙酸-水... 相似文献
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针对间歇精馏过程,在恒定塔顶馏出液成分含量的变回流比操作过程中,常用的手动给定回流比调节方式会造成操作误差,成分含量波动较大的问题,设计了一个变回流比智能控制器,实现自动调节回流比以消除这种人为操作带来的误差.通过在实际精馏装置上进行调试,对比人工手动调节回流比控制、脚本策略自动调节回流比控制、智能调节回流比控制三种调节方式下塔顶馏出液成分含量分布,得出在该智能调节器调节下塔顶馏出液成分含量相对前两种调节方式要平稳. 相似文献
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《Computers & Chemical Engineering》2001,25(4-6):561-569
Often, the main source of disturbance for a batch distillation system is an upset in the feed to the process. If the operation of a batch column is carried out on the basis of the nominal value of the feed composition, a high degree of uncertainty in the initial conditions to the batch may lead to run the column suboptimally, with a possibly large economic penalty. In this paper, a three-step strategy is proposed for the closed-loop implementation of optimal operating policies for batch rectifiers. First, the optimal reflux rate is calculated off-line for several feed compositions. Then, a correlation is developed off-line between the optimal reflux rate and the composition profile in the column at the end of the startup phase. Finally, the detection of the composition profile is performed on-line during the startup phase, so that the optimal reflux rate can be calculated and implemented in a closed-loop fashion. This allows operating the column optimally even though the actual feed composition is not known. Since the calculations to be performed on-line are straightforward, the computational demand is kept to a minimum. Results for binary and ternary systems indicate that, by using the proposed procedure, the column performance can be improved by as much as 30% with respect to a conventional open-loop optimal strategy. 相似文献
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In this note analytical equations are presented that describe the separation obtained for binary batch distillation. Formulas are obtained for both the constant distillate composition and constant reflux methods of operation. The results are strictly for distillation with an infinite number of stages ( corresponding to minimum reflux) however, it is shown that the equations derived closely describe the operation with a small finite number of stages. 相似文献
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间歇精馏过渡馏分脉冲馏出规律研究 总被引:4,自引:0,他引:4
建立了二元理想物系考虑全塔持液量的间歇精馏微分形式的数学模型,采用四阶定步长龙格-库塔法对间歇精馏过渡馏分的常规操作和脉冲式操作过程进行模拟计算。实验证明,模拟计算结果与实际符合较好。提出的C因子概念可用于考察间歇精馏操作效率和经济效益,通过过程模拟,计算了间歇精馏不同操作模式下C因子的值,并由此分析了不同操作模式的动态规律。 相似文献