带有内部热集成的多储罐间歇精馏全回流操作

doi:10.11949/j.issn.0438-1157.20150447

摘要/Abstract

摘要：

鉴于间歇精馏热力学效率低的缺点,提出带有内部热集成的多储罐间歇精馏全回流操作(IHIMVBD)分离二元混合物的新型操作方式。在该操作中,多储罐间歇精馏塔被同轴的夹套式再沸器环绕,利用安装在再沸蒸汽管线上的压缩机使精馏塔的操作压力高于夹套式再沸器,使热量通过精馏塔壁面从高压的精馏塔传向低压的再沸器,实现热量的内部集成。为了进一步提高热力学效率和经济效益,将塔顶蒸汽再压缩技术应用于IHIMVBD,构成强化的内部热集成多储罐间歇精馏全回流操作(Int-IHIMVBD)。该操作能额外利用被压缩的塔顶蒸汽的潜热供给塔釜料液再沸,实现塔顶蒸汽与塔釜料液的热集成。通过模拟分离乙醇-正丙醇的实例表明,相比MVBD和IHIMVBD,Int-IHIMVBD能显著提高分离过程的热力学效率和经济效益。

关键词: 多储罐间歇精馏, 全回流, 内部热集成, 蒸汽再压缩, 节能, 经济, 二元混合物

Abstract:

Batch distillation is a highly energy inefficient process. To reduce its energy consumption, an internal heat integrated multivessel batch distillation with constant total reflux operation (IHIMVBD) is proposed for separation of binary mixtures. The rectifier surrounded by a jacketed reboiler concentrically is operated at a higher pressure compared to that in the jacketed reboiler, so the heat transfers from the high pressure rectification tower to the low pressure still through the internal wall. For this purpose, an isentropic compression system is installed in the reboiled vapor line. In order to improve the thermodynamic and economic performance, an intensified IHIMVBD (Int-IHIMVBD) scheme is developed by introducing overhead vapor recompression mechanism in the IHIMVBD structure. This scheme is to additionally utilize the latent heat of compressed overhead vapor for vaporizing the reboiler liquid. The features of the IHIMVBD system and its intensified form are illustrated by separating a binary mixture of ethanol and n-propanol. The Int-IHIMVBD configuration shows promising energy saving and economic potential over the IHIMVBD and MVBD.

Key words: multivessel batch distillation, total reflux, internal heat integration, vapor recompression, energy saving, economics, binary mixture

中图分类号:

TQ028.3

赵朔, 白鹏. 带有内部热集成的多储罐间歇精馏全回流操作[J]. 化工学报, 2015, 66(11): 4476-4484.

ZHAO Shuo, BAI Peng. Internal heat integrated multivessel batch distillation with constant total reflux operation[J]. CIESC Journal, 2015, 66(11): 4476-4484.

参考文献 20

[1]	Demicoli D,Stichlmair J. Separation of ternary mixtures in a batch distillation column with side withdrawal [J]. Comput. Chem. Eng., 2004, 28(5): 643-650.
[2]	Skogestad S, Wittgens B, Litto R, Sørensen E. Multivessel batch distillation [J]. AIChE Journal, 1997, 43(4): 971-978.
[3]	Skouras S, Skogestad S. Time (energy) requirements in closed batch distillation arrangements [J]. Comput. Chem. Eng., 2004, 28(5): 829-837.
[4]	Hegely L, Lang P. Comparison of closed and open operation modes of batch distillation [J]. Chem. Eng. Trans., 2011, 25: 695-700.
[5]	Jiang Zhankun (姜占坤), Bai Peng (白鹏). Separation of dynamic total reflux in multi-vessel batch distillation [J]. Chemical Engineering (China)(化学工程), 2011, 39(8): 79-81.
[6]	Zhao Shuo, Bai Peng, Tang Ke, Li Guangzhong. Optimal operation policy of multivessel batch distillation with constant total reflux operation for separation of a binary mixture [J]. Asia-Pac. J. Chem. Eng., 2013, 9: 239-247.
[7]	Tang Ke, Bai Peng, Li Guangzhong. Total reflux operation of multivessel batch distillation for separation of binary mixtures [J]. Chin. J. Chem. Eng., 2014, 22(6): 622-627.
[8]	Zhao Shuo, Bai Peng, Guo Xianghai, Tang Ke, Li Guangzhong. Time requirements in closed and open batch distillation arrangements for separation of a binary mixture [J]. Pol. J. Chem. Tech., 2014, 16(4): 66-74.
[9]	Jana A K, Mane A. Heat pump assisted reactive distillation: wide boiling mixture [J]. AIChE Journal, 2011, 57(11): 3233-3237.
[10]	An Weizhong (安维中), Lin Zixin (林子昕), Jiang Yue (江月), Chen Fei (陈菲), Zhou Liming (周立明), Zhu Jianmin (朱建民). Design and optimization of an internally heat integrated reactive distillation column for ethylene glycol production [J]. CIESC Journal (化工学报), 2013, 64(12): 4634-4640.
[11]	Lin Xiyu (蔺锡钰), Wu Hao (吴昊), Shen Benxian (沈本贤), Ling Hao (凌昊). Steady-state behavior and control of Kaibel divided-wall column for aromatics separation [J]. CIESC Journal (化工学报), 2015, 66(4): 1353-1362.
[12]	Johri K, Babu G U B, Jana A K. Performance investigation of a variable speed vapor recompression reactive batch rectifier [J]. AIChE Journal, 2011, 57(11): 3238-3242.
[13]	Babu G U B, Aditya R, Jana A K. Economic feasibility of a novel energy efficient middle vessel batch distillation to reduce energy use [J]. Energy, 2012, 45: 626-633.
[14]	Maiti D, Jana A K, Samanta A N. A novel heat integrated batch distillation scheme [J]. Appl. Energy, 2011, 88(12): 5221-5225.
[15]	Jana A K, Khan M N, Maiti D. Improving energy efficiency and cost-effectiveness of batch distillation for separating wide boiling constituents (Ⅱ): Internal versus external heat integration [J]. Chem. Eng. Process., 2013, 72: 122-129.
[16]	Iwakabe K, Nakaiwa M, Huang Kejin, Nakanishi T, Røsjorde A, Ohmori T, Endo A, Yamamoto T. Energy saving in multicomponent separation using an internally heat integrated distillation column (HIDiC) [J]. Appl. Therm. Eng., 2006, 26(13): 1362-1368.
[17]	Douglas J M. Conceptual Design of Chemical Processes [M]. New York: McGraw-Hill, 1988: 568-577.
[18]	Lin S W, Yu C C. Design and control for recycle plants with heat-integrated separators [J]. Chem. Eng. Sci., 2004, 59(1): 53-70.
[19]	Huang Kejin, Shan Lan, Zhu Qunxiong, Qian Jixin. Adding rectifying/stripping section type heat integration to a pressure-swing distillation (PSD) process [J]. Appl. Therm. Eng., 2008, 28(8): 923-932.
[20]	Jana A K, Maiti D. Assessment of the implementation of vapor recompression technique in batch distillation [J]. Sep. Purif. Technol., 2013, 107: 1-10.