Evaluation of cogeneration plant with steam and electricity production based on thermoeconomic and exergoenvironmental analyses

Cavalcanti, Eduardo José Cidade; Souza, Gabriel Fernandes de; Lima, Matheus

doi:10.1504/ijex.2018.10011562

Cited by 1 publication

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“…Component Exergy rate of fuel ( _ E F ) Exergy rate of product ( _ E P ) with 212.15 MW electricity production with multi-effect distillation. 45 Others works indicate the same behavior, with the combustion chamber presenting the highest exergy destruction rate References [46,47]. Boyano et al 46 The highest exergy efficiencies were obtained at the flash boxes, higher than 93%.…”

Section: Resultsmentioning

confidence: 83%

“…studied the production of hydrogen, and the combustion chamber presented the highest exergy destruction-this component should have the highest priority for improvement from a thermodynamic point of view. Cavalcanti et al47 studied a cogeneration plant, and the combustion chamber showed the highest exergy destruction. This fact is due to the combustor's inherent nature, which destroys the higher value of fuel chemical exergy converting into thermal exergy.…”

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confidence: 99%

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Energetic and exergetic performances of a multi‐effect desalination unit driven by a gas turbine

Cavalcanti,

Santos,

Carvalho

2023

Env Prog and Sustain Energy

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Desalination can provide additional water resources in water‐stressed zones and also in zones suffering from water pollution or insufficient/overexploited groundwater. This study carried out the energy and exergy assessments of a multi‐effect desalination unit driven by a gas turbine based on the specific exergy cost (SPECO) approach. The chemical exergies of brine and seawater are explicitly considered (most studies consider the same specific heat for input seawater and output brine). In addition, the enthalpy of each flow of the desalination unit is considered according to its salt concentration (results are then compared to the constant specific heat model). The highest exergy rates of fuel and product are obtained at the combustion chamber, and its exergy efficiency is 67.83%. The lowest exergy efficiencies were obtained at the condenser, followed by the first effect of the desalination unit, and the heat recovery steam generator. The overall exergy efficiency of the multi‐effect distillation unit is 21.49%. Regarding exergy destruction, as expected, the highest rate was obtained at the combustion chamber, which contributed with 41% to the overall exergy destruction, followed by the regenerator and heat recovery steam generator, with contributions of 16% and 11%, respectively, to overall exergy destruction.

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