化工学报 ›› 2022, Vol. 73 ›› Issue (7): 3090-3098.doi: 10.11949/0438-1157.20220121

• 分离工程 • 上一篇    下一篇

气相进料对隔板精馏塔优化设计的影响

刘会影1(),贾胜坤1,2(),罗祎青1,2,袁希钢1,2,3()   

  1. 1.天津大学化工学院，天津 300354
    2.天津大学化学工程研究所，天津 300354
    3.化学工程联合国家重点实验室 （天津大学），天津 300354
  • 收稿日期:2022-01-21 修回日期:2022-03-01 出版日期:2022-07-05 发布日期:2022-08-01
  • 通讯作者: 贾胜坤,袁希钢 E-mail:lhy_1997@tju.edu.cn;jiask@tju.edu.cn;yuanxg@tju.edu.cn
  • 作者简介:刘会影(1997—)，女，硕士研究生，lhy_1997@tju.edu.cn
  • 基金资助:
    国家自然科学基金项目(22178247)

Influence of vapor feed on optimal design of dividing wall column

Huiying LIU1(),Shengkun JIA1,2(),Yiqing LUO1,2,Xigang YUAN1,2,3()   

  1. 1.School of Chemical Engineering and Technology, Tianjin 300354, China
    2.Chemical Engineering Research Center, Tianjin University, Tianjin 300354, China
    3.State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300354, China
  • Received:2022-01-21 Revised:2022-03-01 Published:2022-07-05 Online:2022-08-01
  • Contact: Shengkun JIA,Xigang YUAN E-mail:lhy_1997@tju.edu.cn;jiask@tju.edu.cn;yuanxg@tju.edu.cn

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摘要：

隔板精馏塔（DWC）在节能和节省设备投资方面具有十分突出的优势，隔板精馏塔中隔板位置是重要的设计变量，影响分离效果及能耗，当进料中含有气相时这种影响更加显著。选用苯、甲苯和对二甲苯三元物系，研究了进料的气相分率对隔板位置的影响并确定最优隔板位置。采用严格模拟方法，以年度总费用（TAC）为评价指标，比较不同进料气相分率下隔板塔的经济性，其中气相进料较液相进料TAC最高可节省23.33%。并通过灵敏度分析展示了在进料中含有气相时确定最优隔板位置的重要性。

关键词: 精馏, 隔板塔, 气相进料, 隔板位置, 优化

Abstract:

Dividing wall column (DWC) has outstanding advantages in terms of energy saving and investment cost for distillation separation. The positioning of the dividing wall effectively affects the separation efficiency and energy consumption, especially when the feed contains vapor phase. In the present paper, ternary mixture of benzene, toluene, and p-xylene is selected as the separation system to study the effect of the feed vapor fraction on the optimal positioning of the dividing wall in a DWC and proposes a method for determining the optimal position. By using rigorous simulation and the total annual cost (TAC) as the objective function, the economic performance of the DWC is investigated under different vapor fractions of the feed, and feed with vapor can save up to 23.33% of TAC compared to feed with liquid. The results demonstrate the importance of optimal dividing wall positioning when the feed contains vapor phase by sensitivity analysis.

Key words: distillation, dividing wall column, vapor feed, dividing wall position, optimization

中图分类号: 

  • TQ 028.3

图1

隔板位置布置图"

图2

隔板塔设计示意图"

图3

隔板塔设计框图"

表1

进料状况和产品要求"

变量变量值
进料组成/%(mol)A:0.3;B:0.3;C:0.4
进料压力/kPa101.325
进料气相分率γf0/1
产品纯度要求/%(mol)A:0.98; B:0.98; C:0.98

表2

不同进料条件下的设计变量和相关费用"

变量工况a工况b工况c
进料气相分率γf011
结构变量
塔径D/m3.0793.0793.491
隔板位置参数β0.63760.63760.8221
各塔段塔板数
Ⅰ558
Ⅱ111113
Ⅲ101011
Ⅳ10108
Ⅴ111110
Ⅵ111110
操作变量
进料流量F/(kmol/h)500257500
塔顶压力P/kPa32.9532.9552.85
回流比RR2.6796.254.942
侧采分率Sf/%(mol)0.58060.31480.5602
再沸比BR2.1451.9591.267
液相分割比RL/%(mol)0.32850.46510.622
气相分割比RV/%(mol)0.59110.12810.4519
费用
设备费用/104 USD142.7133.9153.2
操作费用/104 USD109.354.7969.18
TAC/104 USD156.999.43120.3
(TAC/F)/(104 USD/kmol)0.31380.38690.2405

图4

隔板精馏塔塔板压降分布"

图5

不同进料气相分率下费用变化"

图6

不同进料气相流率下隔板塔隔板位置参数变化"

图7

TAC值随隔板位置变化"

图8

气相/液相分割比随隔板位置变化"

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