Exergic, economic and environmental impacts of natural gas and diesel in operation of combined cycle power plants

Vandani, Amin Mohammadi Khoshkar; Joda, Fatemeh; Boozarjomehry, Ramin Bozorgmehry

doi:10.1016/j.enconman.2015.11.048

Cited by 65 publications

(13 citation statements)

References 33 publications

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“…The physical exergy of combustion gas and air can be calculated by the expression in Equation ( 15) 40 and that of solids and liquids can be calculated by Equation ( 16), 41 whereby C p , R, T, P, and refer to the specific heat at constant pressure, universal gas constant, temperature, pressure, and specific volume, respectively. Furthermore, the chemical exergy of gaseous hydrocarbon fuel in the form C a H b on a mass unit basis can be calculated by Equation ( 17), 42 whereby is the exergy grade function of fuel.…”

Section: T a B L E 1 Specific Heat Capacity Of Different Substancementioning

confidence: 99%

Energy, exergy, exergo‐environmental, and exergetic sustainability analyses of a gas engine‐based CHP system

Hassan

Barua

Das

2021

Energy Science & Engineering

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The electricity demand is ever increasing, and the worldwide power generation is largely dependent on the rapidly dwindling fossil fuel resources. It is no different in Bangladesh as well where the prevailing dynamic in the energy sector projects to a certain lack of sustainability. This makes the performance evaluation to determine and improve the efficiency of energy conversion systems an unavoidable requisite. This study investigates the energetic and exergetic performance of a gas engine-based (4 MW) combined heat and power system situated at Rajshahi District in Bangladesh. Different thermodynamic performance parameters along with the exergo-environmental effect and the sustainability of the system are also assessed additionally. The overall system and individual components are analyzed based on the actual data measured on site at 48% engine load and a constant engine speed of 1500 rpm. The results reveal that the maximum energy loss and exergy destruction occur in the reciprocating engine with values of 656.54 kW and 1835.04 kW, respectively, followed by the heat recovery steam generator with 465.51 kW energy loss and 671.51 kW exergy destruction.The overall system has energy and exergy efficiency of 29.95% and 23.12%, respectively. The exergetic sustainability index of the system is found to be 1.30.

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Section: T a B L E 1 Specific Heat Capacity Of Different Substancementioning

confidence: 99%

Energy, exergy, exergo‐environmental, and exergetic sustainability analyses of a gas engine‐based CHP system

Hassan

Barua

Das

2021

Energy Science & Engineering

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“…Although the fact that almost 88% of electricity generation is covered by thermal turbines, this old generation turbines have an average efficiency of 37% (Mehrpanahi and Payganeh 2017). Thus, the development of advanced technology will lead to a significant increase in efficiency rates (Chaquet et al 2012;Mohammadi Khoshkar Vandani et al 2016). Iran as the sixth producer of turbines in the world is able to improve its old infrastructure.…”

Section: Advanced Technology Development (Atd)mentioning

confidence: 99%

A techno-economic and environmental assessment of low-carbon development policies in Iran's thermal power generation sector

Motlagh

Panahi

Hemmasi

et al. 2021

Int. J. Environ. Sci. Technol.

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The power generation sector is increasingly affecting global warming due to its greenhouse gases (GHGs) emissions. Hence, improving the efficiency of thermal power plants is effective action in mitigating national and global GHG emissions. Accordingly, Long-range Energy Alternatives Planning has been used to the prediction of electricity consumption and supply, types of costs, and GHG emissions for a 20-year period (2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019)(2020)(2021)(2022)(2023)(2024)(2025)(2026)(2027)(2028)(2029)(2030) in Iran thermal power plants. In this paper, a business-asusual (BAU) scenario and seven different scenarios were designed to investigate the impact of simultaneous management of supply-side and demand-side power generation. The findings showed that all alternative scenarios allowing the country to fulfill its unconditional (Nationally Determined Contribution) NDC. Further, the EEP, EPI, and ATD scenarios will have respectively 25%, 22%, and 12% lower emission than the BAU scenario, which will enable Iran to fulfill its conditional NDC by 2030. The superior scenarios in terms of electricity generation costs were found to be EPI and EEP, which will result in approximately US$5 billion cost-saving compared to BAU. The hybrid scenario was known as the preferred scenario, which will generate approximately US$12 billion greater benefit than BAU in terms of net present value.

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“…Besides, we assume that the ambient temperature and pressure are 20 • C and 1 bar which means that the exergy value of inlet air is 0. In this paper, to simplify the analysis process, the simulation was further evaluated under the following conditions [27]:…”

Section: Assumptionsmentioning

confidence: 99%

“…Different from the above energy analysis that is based on the first law of thermodynamics, the exergy analysis can provide significant evaluation both quantitatively and qualitatively occurring in energy system, which has demonstrated to be a powerful assessment for system thermodynamic analysis [27]. Fahad [28] presented a comprehensive exergy analysis for special power plants driven by PTCs.…”

Section: Introductionmentioning

confidence: 99%

Advanced Thermodynamic Analysis Applied to an Integrated Solar Combined Cycle System

Wang

Zhang

et al. 2018

Energies

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The variation performance of integrated solar combined cycle (ISCC) is presented using energy, conventional exergy and advanced exergy analysis methods to provide information about exergy destruction of components and efficiencies of overall plant. Moreover, the theory of dividing the exergy destruction of main components into unavoidable/avoidable and exogenous/endogenous parts allows for further understanding the real potentials for improving. Besides, the exergy destruction rate and exergy efficiency of components as well as overall plant were hourly analyzed within a typical day. Results indicate the exergy destruction rate of overall system drops from 49.79% to 44.65% in summer and decreases from 49.79% to 47.59% in winter. As the solar irradiation intensity rises, the solar field efficiency reaches to 42.16% in winter and 47.5% in summer. The solar-to-electric energy efficiency gets to 13.69% in winter and 15.46% in summer. In addition, with the increase of solar energy input to the ISCC system, the exergy destruction of Brayton cycle components decreases; however, the exergy destruction of Rankine cycle components increases. Furthermore, the exergy destruction of solar field has a large extended from 14.55 MW to 58.03 MW. Moreover, the heat recovery steam generator (HRSG) and the steam turbines have the largest exergy destruction rate of 11.26% and 13.63% at 15:00 p.m.

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Exergic, economic and environmental impacts of natural gas and diesel in operation of combined cycle power plants

Cited by 65 publications

References 33 publications

Energy, exergy, exergo‐environmental, and exergetic sustainability analyses of a gas engine‐based CHP system

Energy, exergy, exergo‐environmental, and exergetic sustainability analyses of a gas engine‐based CHP system

A techno-economic and environmental assessment of low-carbon development policies in Iran's thermal power generation sector

Advanced Thermodynamic Analysis Applied to an Integrated Solar Combined Cycle System

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