Retrofit of Heat Exchanger Networks by a Hybrid Genetic Algorithm with the Full Application of Existing Heat Exchangers and Structures

Liu, Xinwen; Luo, Xianglong; Hu-gen, MA

doi:10.1021/ie501021m

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…The total modification cost was also reduced by 37%. And the energy saving was reduced from 8.53% to 6.35% comparing with the existing HEN from ref according to the energy saving cost conversion. As far as the payback periods, the two strategies were almost the same.…”

Section: Discussionmentioning

confidence: 93%

“…The payback period was about 0.53 y. Compared with the retrofitting strategy from the reference, because of considering the constraint of the changing heat transfer coefficients in this paper, the number of stream splits with the existing heat exchangers reused was decreased by 50%. The total modification cost was also reduced by 37%.…”

Section: Discussionmentioning

confidence: 99%

“…Compared with the retrofitting strategy from ref , the existing heat exchangers and the existing structures were both used up to 100% (calculating according to the number of nodes) due to adopting the existing heat exchangers and structures full application in situ in two kinds of HEN retrofit strategies. Because of considering the constraint of the changing heat transfer coefficients in this paper, the number of stream splits with the existing heat exchangers reused was decreased by 50% in the same example.…”

Section: Case Study and Discussionmentioning

confidence: 99%

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Optimal Retrofit Strategy of Heat Exchanger Networks Applied in Crude Oil Distillation Units

Liu

Luo

Kabelac

2016

Ind. Eng. Chem. Res.

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A novel mathematical programming method was applied to acquire the optimal heat exchanger network (HEN) retrofit in the crude oil distillation unit. The mathematical model was based on the stagewise superstructure model with splits of streams from the work of Yee et al.[Chin. J. Chem. Eng. 2007, 15 (2), 296−301]. The objective function was developed into the minimum of the sum of the cost of modifications and the cost of utilities in one year, focusing on the changing heat transfer coefficients arising in the reused existing heat exchangers from stream splits. The HEN modifications included buying new heat exchangers, adding or reducing areas of the existing heat exchangers, moving the existing heat exchangers, and laying pipes. It was a mixed integer nonlinear program (MINLP) problem. A hybrid genetic algorithm was used to optimize the MINLP problem. In order to reduce the total cost of modifications, the heat exchangers and the corresponding matching structures between the hot and cold streams in the existing HENs were designed as elites introduced into the hybrid genetic algorithm. The Dittus−Boelter and Kern correlations were used to estimate the convective heat transfer coefficients of the corresponding streams. One example was given to show the effect of the novel retrofit strategy.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Case Study and Discussionmentioning

confidence: 99%

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