Evaluation of different vapor recompression distillation configurations based on energy requirements and associated costs

Kazemi, Abolghasem; Hosseini, Mohamadjavad; Mehrabani-Zeinabad, Arjomand; Faizi, Vafa

doi:10.1016/j.applthermaleng.2015.10.042

Cited by 32 publications

(15 citation statements)

References 28 publications

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“…Several studies [28][29][30] have explored the use of mechanical vapor recompression to reduce/eliminate the reboiler heating utility in energy-intensive commercial distillation processes. It is mainly obtained by cracking higher hydrocarbons in a refinery cracker.…”

Section: Case Study On C3-splittermentioning

confidence: 99%

“…The reboil and reflux ratios for the C3-splitter are high, which makes this one of the most energy-intensive commercial distillation processes. Several studies [28][29][30] have explored the use of mechanical vapor recompression to reduce/eliminate the reboiler heating utility in energy-intensive commercial distillation processes.…”

Section: Case Study On C3-splittermentioning

confidence: 99%

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Framework for work‐heat exchange network synthesis (WHENS)

2018

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Work and heat are the two predominant forms of energy in the process industry. Considerable savings can be achieved by synergizing the work and heat requirements of process streams. A generalized framework for integrating heat and work simultaneously is proposed based on a mixed‐integer nonlinear programing model for work‐heat exchange network synthesis. Starting with a set of streams with known flows, temperatures, and pressures, a network of single‐shaft‐turbine‐compressors with motors/generators, valves, heat exchangers, and utility heaters/coolers is synthesized for minimized total annualized cost. In contrast to existing works, (1) streams are not preclassified as hot/cold or high/low pressure, (2) pressure changes are allowed for streams with no net pressure change, (3) liquid‐vapor phase changes are allowed, and (4) phase‐based property correlations are used. Successful application of our approach to C3 splitting yields a nonintuitive configuration. Another application of an offshore natural gas liquefaction process is also studied. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2472–2485, 2018

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Section: Case Study On C3-splittermentioning

confidence: 99%

Section: Case Study On C3-splittermentioning

confidence: 99%

Framework for work‐heat exchange network synthesis (WHENS)

2018

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“…Heat pump application is mostly limited to close boiling point mixtures fractionation [18], such as alkanes [19] or other mixtures of hydrocarbon gases [20]. Application in different systems, such as benzene-toluene mixtures, has been studied recently [21]. Heat pump driver is in most cases an electromotor [16] or a steam turbine [22].…”

Section: Introductionmentioning

confidence: 99%

“…Several heat pump designs were studied from the techno-economic point of view in [28], which are able to deliver useful heat at temperatures over 100 • C. Compression heat pump applications in various industry branches, including sugar production and paper drying have been presented in a best practice brochure by the U.S. Department of Energy [29], while other ones in refining, petrochemistry, and gases fractionation were reported in [19,22,24]. Significant energy intensity decrease in the aromatics fractionation process can be achieved by optimized compression heat pump design in [21] with similar findings presented in [24] for acetone-methanol mixture splitting. Ethane-ethylene and propane-propylene splitting is a typical large-scale industrial process where a compression heat pump is used as a well-proven technology [16,22].…”

Section: Introductionmentioning

confidence: 99%

Novel Concept of Cogeneration-Integrated Heat Pump-Assisted Fractionation of Alkylation Reactor Effluent for Increased Power Production and Overall CO2 Emissions Decrease

et al. 2020

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Alkylate produced by catalyzed reaction of isobutane and olefin-rich streams is a desired component for gasoline blending. Fractionation of the alkylation reactor effluent is energy demanding due to the presence of close boiling point components and solutions cutting its energy intensity; expenses associated with this process are investigated intensely nowadays. This paper presents a novel conceptual design and techno-economic analysis of alkylation reaction effluent fractionation revamp to reach a cut in energy costs of the fractionation process without the need to revamp the rectification columns themselves, providing thus an alternative approach to a more sustainable alkylation process. Two cases are considered—A. additional steam turbine installation or B. combustion engine-driven heat pump-assisted rectification. Mathematical modeling of the considered system and its revamp is applied using the “frozen technology” approach. Real system operation features and seasonal variations are included considering the refinery’s combined heat and power (CHP) unit operation and CO2 emissions balance both internal and external to the refinery. Case A yields an expectable yearly benefit (saved energy minus additionally consumed energy minus CO2 emissions increase; expressed in financial terms) of €110–140 thousand, net present value (NPV) of −€18 to €272 thousand and produces 3.3 GWh/year of electric energy. Case B delivers a benefit of €900–1200 thousand, NPV of −€293 to €2823 thousand while producing 33 GWh/year of electricity. Both cases exhibit analogous simple payback periods (8–10 years). Marginal electric efficiency of Case B (78.3%) documents the energy integration level in this case, exploiting the system and CHP unit operation synergies. CHP unit summer operation mode and steam network restrictions significantly affect the seasonal benefit of Case B. CO2 emissions increase in both cases, Case A and Case B, considering the refinery level. However, including external CO2 emissions leads to emissions decrease in both cases of up to 26 kton/year (Case B.) The presented results document the viability of the proposed concepts comparable to the traditional (reference) solution of a high performance (COP = 8) heat pump while their performance sensitivity stresses the need for complex techno-economic assessment.

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“…This is probably its main draw back. Various technologies such as heat pump assisted distillation [3][4][5], distillation with vapor recompression [6][7][8][9], distillation with bottom flashing [10,11] and internally heat integrated distillation columns (i-HIDiC) [12][13][14][15][16][17] have been developed previously for reducing energy requirements of distillation systems. Simplified process flow diagrams of bottom flashing heat pump is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a novel configuration of bottom flashing on dual distillation columns for saving energy

et al. 2017

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Vapor recompression and bottom flashing are among the developed technologies for enhancing energy efficiency of distillation processes. In this paper, a novel configuration of bottom flashing system is proposed for enhancing energy efficiency of dual columns such as direct distillation sequences. The system is designed to operate between two distillation columns. The proposed system engages two separate distillation columns, both of which can be wide boiling systems. The system incorporates two interacting bottom flashing systems that engage the two distillation columns through heat transfer from the top product of the second column to the bottom product of the first column which in turn results in elimination/reduction of utility requirements of condenser of the second column along with reboiler of the first column. Based on the results of this study, compared to conventional direct sequence distillation, 40.3% reduction in energy requirements and 20.7% reduction total annual costs of the process can be obtained through application of the proposed system.

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Evaluation of different vapor recompression distillation configurations based on energy requirements and associated costs

Cited by 32 publications

References 28 publications

Framework for work‐heat exchange network synthesis (WHENS)

Framework for work‐heat exchange network synthesis (WHENS)

Novel Concept of Cogeneration-Integrated Heat Pump-Assisted Fractionation of Alkylation Reactor Effluent for Increased Power Production and Overall CO2 Emissions Decrease

Evaluation of a novel configuration of bottom flashing on dual distillation columns for saving energy

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