Integrating hydroprocessors in refinery hydrogen network optimisation

Umana, Blessing; Shoaib, Abeer M.; Zhang, Nan; Smith, Robin

doi:10.1016/j.apenergy.2014.06.080

Cited by 43 publications

(15 citation statements)

References 13 publications

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“…In addition to the concentration constraint, there is another constraint for each hydrogen sink, which may be flow rate constraint [14], or pure hydrogen load constraint [15]. In a hydrogen network, it is necessary to consider flow rate constraints on some sinks as well as pure hydrogen load constraints on some other sinks [16].…”

Section: Introductionmentioning

confidence: 99%

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An exergy-based approach for hydrogen network integration

Wang

Feng

et al. 2015

Energy

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Section: Introductionmentioning

confidence: 99%

“…In a hydrogen network, pressure is an important constraint [14]. Each hydrogen sink requires a specific pressure, and so the hydrogen source feeding it should have a higher pressure.…”

Section: Introductionmentioning

confidence: 99%

An exergy-based approach for hydrogen network integration

Wang

Feng

et al. 2015

Energy

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“…It is possible to produce light olefins and gasoline fractions with a high research octane number using Fluid Catalytic Cracking of FT waxes (naphtha yield can be even 70%) [21]. In addition, hydroconversion processes require a significant amount of high quality hydrogen, which usually acts as a bottleneck in conventional refineries [22]. Due to the reasons mentioned above, it may be worthwhile to examine and increase the efficiency of other conversion processes aside from hydroconversion.…”

Section: Introductionmentioning

confidence: 99%

Value-Added Pyrolysis of Waste Sourced High Molecular Weight Hydrocarbon Mixtures

2022

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In this study, Fischer-Tropsch paraffin mixture, heavy residue of waste polyethylene pyrolysis, shredded and crashed agricultural polyethylene waste and their combinations were pyrolysed both thermally and catalytically in a two-stage reactor system. During the experimental work, yields and compositions of pyrolysis products were studied as function of feedstock composition and catalyst placement. It was found that the average molecular weight of feedstocks and the presence of ZSM-5 catalyst also have significant effects on the product yields and the compositions. Feedstocks with high concentration of Fischer-Tropsch paraffin and real waste polyethylene resulted in deeper fragmentation in both thermal and thermo-catalytic pyrolysis. Due to the deeper fragmentation, they seemed to be suitable feedstocks for the production of C6-C9 and C10-C14 hydrocarbons. Meanwhile, for production of C15-C21 hydrocarbons, the use of a higher concentration of heavy residue of waste polyethylene pyrolysis in the feedstocks is recommended. From the point of view of liquid hydrocarbon and isomer production, the placement of the catalyst into the 1st reactor proved to be more advantageous. When the catalyst was placed into the 2nd reactor, the product formation shifted to the more volatiles, isomers took part in secondary cracking reactions and aromatics formed in higher concentrations.

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“…The application of the methodology indicated that incorporation of more realistic process models could lead to more reliable results. Later, Umana et al , extended the model to further approximate the real production process by introducing an empirical model to predict the hydrogen consumption and the formations of light hydrocarbons in the hydroprocessing reactors and formulated a nonlinear programming (NLP) model for the HNS problem.…”

Section: Introductionmentioning

confidence: 99%

A Surrogate-Assisted Approach for the Optimal Synthesis of Refinery Hydrogen Networks

Wang

Zhou

et al. 2019

Ind. Eng. Chem. Res.

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This paper presents a surrogate-assisted methodology for the optimal synthesis of refinery hydrogen networks, which fully considers the impact of vapor−liquid equilibrium in the flash separation unit, to study the interactions between the varying K-values and the optimal configuration of the overall hydrogen network. In addition, the formations of light hydrocarbons and hydrogen sulfide in the hydroprocessing reactors are calculated by the proposed method. To deliver a more accurate and efficient modeling and optimization, high dimensional model representation (HDMR) is applied to approximate the firstprinciple-based models of the hydroprocessing reactor and flash separation unit. The established surrogate models are integrated with other realistic system constraints, thus formulating a nonlinear programming model for the optimization of refinery hydrogen networks. The approach is illustrated by its application to a case study, in which the results demonstrate that it yields significant differences in the component concentrations of the reactor inlet streams compared to the previous study. The differences further lead to different configurations of the optimal hydrogen network. Therefore, one can conclude that the proposed method can deliver more accurate and realistic results.

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Integrating hydroprocessors in refinery hydrogen network optimisation

Cited by 43 publications

References 13 publications

An exergy-based approach for hydrogen network integration

An exergy-based approach for hydrogen network integration

Value-Added Pyrolysis of Waste Sourced High Molecular Weight Hydrocarbon Mixtures

A Surrogate-Assisted Approach for the Optimal Synthesis of Refinery Hydrogen Networks

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