摘要
以304不锈钢为主要材料,设计并建造了一种新型分散降液筛板塔,塔总高3000 mm,内径68 mm,设有15块分散降液筛板,开孔率13.43%。以乙醇-水二元混合物为实验物系,研究回流比、进料温度、进料量和进料组成对塔板效率的影响。采用四因素三水平的响应面分析方法,优化得出最佳操作条件为回流比1.7、进料温度62℃、进料量12.5 L/h、进料组成x(乙醇)=15.5%,分散降液筛板塔的板效率为47.58%,同等条件下单板效率比传统筛板提高了5.46%~6.95%。此外,基于表观回流比与冷液回流温度、泡点温度与热物性参数的关系,提出了一种泡点回流比矫正公式,有效修正了二者间的偏差。该方法可更准确描述塔顶回流过程,提高精馏操作的准确性,并优化能耗。
A new type of dispersed downcomer sieve tray column was designed and constructed using 304 stainless steel as the main material.The column stands at a total height of 3000 mm with an inner diameter of 68 mm and features 15 dispersed downcomer sieve trays,each with a perforation ratio of 13.43%.An ethanol-water binary mixture was used as the working system to study how factors such as reflux ratio,feed temperature,feed rate,and feed composition influence tray efficiency.A response surface methodology with a four-factor,three-level design was applied to optimize the operating conditions,leading to an optimal reflux ratio of 1.7,feed temperature of 62℃,feed rate of 12.5 L/h,and feed composition of 15.5%.Under these conditions,the tray efficiency of the dispersed downcomer sieve tray column reached 47.58%,which is 5.46%~6.95%higher than that of conventional sieve trays under the same operating conditions.Additionally,a correction formula for the bubble point reflux ratio was proposed based on the relationship between apparent reflux ratio,subcooled reflux temperature,bubble point temperature,and thermophysical parameters.This formula effectively reduces deviations among these parameters,providing a more accurate description of the reflux process at the top of the column and enhancing the precision of distillation operations while optimizing energy consumption.
作者
邓明鑫
查欣璇
张雨婷
郑江涛
郝闯
马婷婷
高晓明
万俊
曹振恒
DENG Mingxin;ZHA Xinxuan;ZHANG Yuting;ZHENG Jiangtao;HAO Chuang;MA Tingting;GAO Xiaoming;WAN Jun;CAO Zhenheng(College of Chemistry and Chemical Engineering Yan′an University,Shaanxi Key Laboratory of Chemical Reaction Engineering,Shaanxi Collaborative Innovation Center of Clean Utilization of Low Rank Coal,Shaanxi Modern Industry College of Green and Efficient Utilization of Energy Resources,Yan′an 716000,China)
出处
《化工科技》
2025年第4期7-14,共8页
Science & Technology in Chemical Industry
基金
国家自然科学基金地区项目(22169021)。
关键词
塔器
分散降液筛板
板效率
回流
二元混合物
Column
Dispersed liquid sieve tray
Tray efficiency
Reflux
Binary mixture
