碳五分离中碳五循环量对能耗影响的模拟计算

为了达到节能降耗和指导生产的目的,考察了碳五分离中碳五循环量对萃取塔和汽提塔能耗的影响。运用化工流程模拟软件Aspen Plus,采用UNIFAC模型对二甲基甲酰胺(DMF)法分离碳五流程进行了模拟计算,得到了比较满意的结果。在此基础上分别计算了2个萃取单元中碳五循环量对萃取塔和汽提塔能耗的影响。计算结果表明:UNIFAC模型适用于处理碳五物系;碳五循环量对第1萃取单元和第2萃取单元能耗影响趋势相同。随着碳五循环量的增加,汽提塔塔顶和塔底的热负荷均增加,萃取精馏塔塔底热负荷先下降后基本保持不变,塔顶热负荷不变。工程实际运用中要综合考虑对精馏塔热负荷和萃取塔塔底温度的影响,选取适合的碳五循环量。

Simulation and calculation for influence of C5 circulating quantity on energy consumption of C5 separation process

In order to reduce the energy consumption and guide the industrial production,the influence of C5 circulating quantity on the energy consumption of extraction in the C5 separation process was researched.Based on the chemical process simulation software Aspen Plus,a whole dimethyl formamide(DMF) separation process for C5 was calculated by UNIFAC model,which concluded more satisfactory results.On that basis,the influence of C5 circulating quantity on the energy consumption of extraction and stripping columns for the two extraction units was calculated.The results show that the UNIFAC model is applicable to the calculations of the C5 systems.The C5 circulating quantity gives the similar results for both the first and the second extraction units.With the increase of C5 circulating quantity,the heat load of the top and bottom of stripping columns increase,and the heat load of the bottom of extracting columns decreases firstly and remains constant afterward,while the heat load of the top remains unchanged throughout the time.The heat load of the distillation column and the bottom temperature of the extracting columns should be taken into considerations in the engineering applications,and the appropriate C5 circulating quantity should be selected.