Exergoeconomic effect of adding a new feedwater heater to a steam power plant

Vandani, Amin Mohammadi Khoshkar; Joda, Fatemeh; Ahmadi, Fatemeh; Ahmadi, Mohammad Hossein

doi:10.1051/meca/2016051

Cited by 14 publications

(3 citation statements)

References 24 publications

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“…The operating cost that includes, operating labour cost (LC), maintenance cost (MANC), insurance and general cost (IGC). The operating cost in ($/year) is given by equation (26).…”

Section: Operating Cost (Oc)mentioning

confidence: 99%

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Thermo-Economic Analysis of Simple Cycle Steam Power Plant

Abed¹,

Sultan²,

Abood³

2023

BJES

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Thermal steam power plants represent the most important and dependable type for supplying the base load of electricity around the world. The thermos-economic analysis is an important tool for improving the performance of thermal steam power plants. In the present study, a thermo-economic analysis of a simple steam power plant for different boiler pressure was performed. The analysis comprises the energy, exergy, entropy, economics, and exergy-economic of a simple cycle steam power plant for different boiler pressure. The analysis was performed for a simple steam power plant with the constant output power of 10 MW and the boiler pressure is varied from 10 bar to 100 bar by a step of 10 bar. For each boiler pressure and constant output power, firstly, the fuel mass flow rate, steam flow rate, energy and exergy efficiency, and cost of electricity were calculated. Secondly, entropy generation, exergy destruction, and exergy efficiency for each component were calculated. Finally, exergy destruction economics for each component of the plant was performed. The results reveal that increasing the boiler pressure from (10 to 100 bar) for constant output power reduces the cost of electricity from (0.135 to 0.1025 $/kWh) due to a decrease in the fuel mass flow rate and an improvement in the thermal cycle and exergy efficiency. Also, when the boiler pressure increases, the exergy destruction for the pump increases, the exergy destruction for the boiler decreases, the exergy destruction for the turbine increases, and the exergy destruction for the condenser decrease.

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“…The operating cost that includes, operating labour cost (LC), maintenance cost (MANC), insurance and general cost (IGC). The operating cost in ($/year) is given by equation (26).…”

Section: Operating Cost (Oc)mentioning

confidence: 99%

“…Exergoeconmics is designed to find the economic losses in each component by the results of exergy analysis to determine how much money each component losses in a year. The model employed in the following computation [26], [29]:…”

Section: Exergoeconomic Analysis Of Steam Power Plantmentioning

confidence: 99%

Thermo-Economic Analysis of Simple Cycle Steam Power Plant

Abed¹,

Sultan²,

Abood³

2023

BJES

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“…Exergoeconomic is not only a tool for minimizing the costs by the use of exergy of the streams, but it also is a powerful tool for understanding the relationship between thermodynamics and economic aspects of the cycle which is applied in several studies. 56,57 In the early steps, fuel and product for each component should be defined in exergoeconomic analysis. The fuel represents the resources needed to generate the product, which is not necessarily restricted to being an actual fuel such as natural gas and the product represents the desired result produced by the system.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Exergoeconomic comparison and optimization of organic Rankine cycle, trilateral Rankine cycle and transcritical carbon dioxide cycle for heat recovery of low-temperature geothermal water

Noroozian

Naeimi

Bidi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Depleting fossil fuel resources and the horrible environmental impacts due to burning fossil fuels emphasize the importance of using renewable energy resources such as geothermal and solar energies. This paper compares performance of CO2 transcritical cycle, organic Rankine cycle, and trilateral Rankine cycle using a low-temperature geothermal heat source. Thermodynamic analysis, exergetic analysis, economic analysis, and exergoeconomic analysis are applied for each of the aforementioned cycles. In addition, a sensitivity analysis is performed on the system, and the effects of geothermal heat source temperature, evaporator pinch point temperature, and turbine inlet pressure on the cycle's performance are evaluated. Finally, the systems are optimized in order to minimize product cost ratio and maximize exergetic efficiency by using the genetic algorithm. Results indicate that the maximum thermal efficiency is approximately 13.03% which belongs to organic Rankine cycle with R123 as working fluid. CO2 cycle has the maximum exergetic efficiency, equals to 46.13%. The minimum product cost ratio refers to the organic Rankine cycle with R245fa as working fluid. Moreover, sensitivity analysis shows that increasing geothermal heat source temperature results in higher output power, product cost ratio, and exergy destruction ratio in all cycles.

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Exergy analysis of a hybrid solar‐fossil fuel power plant

Vakilabadi

Bidi

Najafi

et al. 2019

Energy Science & Engineering

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In this study, exergy analysis, energy analysis, and mathematical modeling are performed in a 35 MW solar‐fossil fuel power plant. The losses of exergy and energy in different components and also changes of the efficiency of exergy and energy are analyzed at a specific day, 20th June. The assumed power plant in this study is Solar Electric Generating Station VI (SEGS VI), located in California's Mojave Desert. A parametric study, under different working conditions, including different working pressures, temperatures, collector output temperature, steam flow rate, and heat transfer fluid (HTF) flow rate is studied and the effect of variation of parameters on the performance of the plant is investigated. Authors found that, the maximum exergy loss happens in the collector and the maximum energy loss occurs in the condenser. Energy analysis shows that 47% of the total loss energy in the cycle happens in the condenser, as the main component that wastes energy. From exergy analysis, the collector and then boiler are the main components wasting exergy where 68.32% of total exergy loss occurs in these two components in hybrid mode (solar‐fossil fuel). Exergy and Energy efficiency variations throughout the day show that minimum exergy efficiency (32.7%) and maximum energy efficiency (23%) occurs at 12 am. Exergy efficiency variation versus turbine inlet pressure shows that the maximum exergy efficiency (26%) accure at 95 bar. The changes of the absorbed heat and solar irradiation of the 20th of June shows a good agreement with the measured data in validated reference.

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Exergoeconomic effect of adding a new feedwater heater to a steam power plant

Cited by 14 publications

References 24 publications

Thermo-Economic Analysis of Simple Cycle Steam Power Plant

Thermo-Economic Analysis of Simple Cycle Steam Power Plant

Exergoeconomic comparison and optimization of organic Rankine cycle, trilateral Rankine cycle and transcritical carbon dioxide cycle for heat recovery of low-temperature geothermal water

Exergy analysis of a hybrid solar‐fossil fuel power plant

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