A conceptual methodology for simultaneous optimization of water and heat with non-isothermal mixing

doi:10.1007/s11705-016-1593-z

Front. Chem. Sci. Eng.

2017, Vol. 11

Issue (2) : 154-165 https://doi.org/10.1007/s11705-016-1593-z

RESEARCH ARTICLE

A conceptual methodology for simultaneous optimization of water and heat with non-isothermal mixing

Yanlong Hou¹, Wanni Xie¹, Zhenya Duan²(

), Jingtao Wang¹(

)

¹. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
². College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China

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Abstract

A new conceptual methodology is proposed to simultaneously integrate water allocation and energy networks with non-isothermal mixing. This method employs a simultaneous model and includes two design steps. In the first step, the water allocation network (WAN), which could achieve the targets of saving water and energy, is obtained by taking account the temperature factor into the design procedure. The optimized targets of both freshwater and energy are reached at this step which ensures this approach is a simultaneous one. In the second step, based on the obtained WAN, the whole water allocation and heat exchange network (WAHEN) is combined with the non-isothermal mixing to reduce the number of heat exchangers. The thus obtained WAHEN can achieve three optimization targets (minimization of water, energy and the number of heat exchangers). Furthermore, the effectivity of our method has been demonstrated by solving two literature examples.

Keywords simultaneous integration non-isothermal mixing multi-target optimization water and energy networks

Corresponding Author(s): Zhenya Duan,Jingtao Wang

Just Accepted Date: 08 September 2016 Online First Date: 17 October 2016 Issue Date: 12 May 2017

Cite this article:

Yanlong Hou,Wanni Xie,Zhenya Duan, et al. A conceptual methodology for simultaneous optimization of water and heat with non-isothermal mixing[J]. Front. Chem. Sci. Eng., 2017, 11(2): 154-165.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-016-1593-z
https://academic.hep.com.cn/fcse/EN/Y2017/V11/I2/154

Fig.1 The flowchart to design the water allocation networks

Tab.1 Data for example 1

Fig.2 Process coordinates for example 1

Fig.3 Concentration order and temperature composite curves for example 1

Tab.2 Stream allocation for example 1

Fig.4 Water allocation network for example 1

Fig.5 The first option of the heat network for example 1

Fig.6 The second option of the heat network for example 1

Fig.7 Overall water and energy network for example 1. The part in the dash-line box is IHEN shown in Fig. 6

Tab.3 Comparisons for example 1

Tab.4 Process data of example 2

Fig.8 Concentration order and temperature composite curves for example 2

Fig.9 Water allocation network for example 2

Fig.10 Overall water and energy network for example 2. The part in the dash-line box is IHEN

Tab.5 Comparisons for example 2

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