内部热耦合精馏塔的传热及优化

doi:10.16085/j.issn.1000-6613.2017-0452

化工进展 ›› 2018, Vol. 37 ›› Issue (01): 7-13.DOI: 10.16085/j.issn.1000-6613.2017-0452

内部热耦合精馏塔的传热及优化

李春利^1,2, 杜季颖¹, 张林¹, 李晓春¹

1 河北工业大学化工学院, 天津 300130;
2 河北工业大学化工节能过程集成与资源利用国家地方联合实验室, 天津 300130

收稿日期:2017-03-20 修回日期:2017-04-14 出版日期:2018-01-05 发布日期:2018-01-05
通讯作者: 李春利(1963-),男,教授,主要从事分离与纯化研究。
作者简介:李春利(1963-),男,教授,主要从事分离与纯化研究。E-mail:lichunli_hebut@126.com。

Investigation on heat transfer and optimization of internally heat-integrated distillation column

LI Chunli^1,2, DU Jiying¹, ZHANG Lin¹, LI Xiaochun¹

1 School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China;
2 National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China

Received:2017-03-20 Revised:2017-04-14 Online:2018-01-05 Published:2018-01-05

摘要/Abstract

摘要： 为研究同轴式内部热耦合精馏塔（HIDiC）在不同压缩比下的传热量和传热系数，以乙醇-水为分离物系，在自制中试装置中进行了实验研究。建立了同轴式HIDiC的传热模型即利用闪蒸罐代替塔板，计算进出闪蒸罐物流的焓值差，从而得到精馏段与提馏段板间换热量，并通过划分区域的方法计算了传热系数。以年度总费用（TAC）作为优化指标研究了实现外回流为零时所需的外部换热器的个数。结果表明：当压缩比为2.2时，塔间传热量最大，冷凝器和再沸器的负荷最低，且压缩比与传热系数的关系为负相关；随着精馏段与提馏段板间最小换热温差的增大，所需外部换热器个数不断减少，TAC呈现降低的趋势，当外部换热器个数为1，即热量耦合位置为精馏段第一块板与提馏段第一块板时，TAC最低。

关键词: 内部热耦合精馏塔, 压缩比, 传热模型, 传热系数, 优化设计

Abstract: In order to research the heat transfer rate and heat transfer coefficient of concentric internally heat-integrated distillation column (HIDiC) at different compression ratios, the experimental study was carried out in the self-made pilot plant with ethanol-water as the separation system. The heat transfer model of concentric HIDiC was built by replacing the plates with flash tanks. The heat transfer rate between the rectifying and stripping section was calculated by the enthalpy difference of the flow inlet and outlet of the flash tank, and the heat transfer coefficient was got by dividing region. The annual total cost (TAC)was used as an optimized index to study the number of external heat exchangers required to realize the zero external return. The results showed that when the compression ratio was 2.2, the heat transfer rate reached to the maximum, the duty of condenser and reboiler reached to the minimum, and the relationship between the compression ratio and heat transfer coefficient was negative. The number of external heat exchangers decreased and TAC began to drop with the increase of the minimum heat transfer temperature difference. TAC reached to the minimum by adding one heat exchanger between the first plate of rectifying and stripping section.

Key words: internally heat-integrated distillation column, compression ratio, heat transfer model, heat transfer coefficient, optimal design

中图分类号:

TQ202

李春利, 杜季颖, 张林, 李晓春. 内部热耦合精馏塔的传热及优化[J]. 化工进展, 2018, 37(01): 7-13.

LI Chunli, DU Jiying, ZHANG Lin, LI Xiaochun. Investigation on heat transfer and optimization of internally heat-integrated distillation column[J]. Chemical Industry and Engineering Progress, 2018, 37(01): 7-13.

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内部热耦合精馏塔的传热及优化

Investigation on heat transfer and optimization of internally heat-integrated distillation column

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