Comparative exergoeconomic assessment of coal-fired power plants – Binary Rankine cycle versus conventional steam cycle

Hofmann, Mathias; Tsatsaronis, George

doi:10.1016/j.energy.2017.09.117

Cited by 20 publications

(9 citation statements)

References 24 publications

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“…These analyses clearly reveal the formation process of the cost of the final product, e.g., Figure 5 for coal-fired power plants [102]. For coal-fired power plants as detailed analyzed in [83,102], The air preheater and furnace have far less exergoeconomic factor indicating the related costs of these two components due to large exergy destruction rates, while the relative cost differences of the heat surfaces in the boiler subsystem are much larger than those of the turbine subsystem, mainly due to their high investment costs. The exergoeconomic performance of the turbine stages can be improved by enhancing the stage design and that of the feedwater preheater has a relatively small contribution from the investment costs.…”

Section: Conventional Exergy-based Analysismentioning

confidence: 90%

Section: Conventional Exergy-based Analysismentioning

confidence: 99%

“…The component-based exergoeconomic analyses have been applied to various steam cycles including subcritical or supercritical coal-and gas-fired power plants with the plant capacity ranging from 150 MWe to 1000 MWe, as summarized in [102]. These analyses clearly reveal the formation process of the cost of the final product, e.g., Figure 5 for coal-fired power plants [102]. For coal-fired power plants as detailed analyzed in [83,102], The air preheater and furnace have far less exergoeconomic factor indicating the related costs of these two components due to large exergy destruction rates, while the relative cost differences of the heat surfaces in the boiler subsystem are much larger than those of the turbine subsystem, mainly due to their high investment costs.…”

Section: Conventional Exergy-based Analysismentioning

confidence: 99%

“…Figure 5. Cost formation process for coal-fired power plants [102]. The readers kindly refer [102] to interpret the involved abbreviations.…”

Section: Conventional Exergy-based Analysismentioning

confidence: 99%

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A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

et al. 2018

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To reach optimal/better conceptual designs of energy systems, key design variables should be optimized/adapted with system layouts, which may contribute significantly to system improvement. Layout improvement can be proposed by combining system analysis with engineers’ judgments; however, optimal flowsheet synthesis is not trivial and can be best addressed by mathematical programming. In addition, multiple objectives are always involved for decision makers. Therefore, this paper reviews progressively the methodologies of system evaluation, optimization, and synthesis for the conceptual design of energy systems, and highlights the applications to thermal power plants, which are still supposed to play a significant role in the near future. For system evaluation, both conventional and advanced exergy-based analysis methods, including (advanced) exergoeconomics are deeply discussed and compared methodologically with recent developments. The advanced analysis is highlighted for further revealing the source, avoidability, and interactions among exergy destruction or cost of different components. For optimization and layout synthesis, after a general description of typical optimization problems and the solving methods, the superstructure-based and -free concepts are introduced and intensively compared by emphasizing the automatic generation and identification of structural alternatives. The theoretical basis of the most commonly-used multi-objective techniques and recent developments are given to offer high-quality Pareto front for decision makers, with an emphasis on evolutionary algorithms. Finally, the selected analysis and synthesis methods for layout improvement are compared and future perspectives are concluded with the emphasis on considering additional constraints for real-world designs and retrofits, possible methodology development for evaluation and synthesis, and the importance of good modeling practice.

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Section: Conventional Exergy-based Analysismentioning

confidence: 90%

Section: Conventional Exergy-based Analysismentioning

confidence: 99%

Section: Conventional Exergy-based Analysismentioning

confidence: 99%

“…Figure 5. Cost formation process for coal-fired power plants [102]. The readers kindly refer [102] to interpret the involved abbreviations.…”

Section: Conventional Exergy-based Analysismentioning

confidence: 99%

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A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

et al. 2018

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“…In developing countries, coal is still the main energy source to generate electricity at present [1][2][3]. With increasing concerns on serious environmental problems caused by coal-fired power plants and fossil resource shortages, it is important to reshape the energy structure and exploit renewable energy to replace the coal.…”

Section: Introductionmentioning

confidence: 99%

Off-design thermodynamic performances of a solar tower aided coal-fired power plant for different solar multiples with thermal energy storage

Yang

Zhai

et al. 2018

Energy

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Solar aided coal-fired power system has been proven to be a promising way to utilise solar energy in large scale. In this paper, the performances of the solar tower aided coal-fired power (STACP) system at 100% load, 75% load, and 50% load for different days are investigated and the maximum solar power that the boiler can absorb under different plant loads are explored. Then, the effects of solar multiple (SM) and the thermal energy storage (TES) hour on the daily performance of STACP system are investigated. Results show that the maximum solar power that a 600 MWe boiler can absorb at 100% load, 75% load and 50% load are 76.4 MWth, 54.2 MWth and 23.0 MWth, respectively. Due to the augmented energy from the solar field, the maximum standard coal consumption rate is reduced by 13.53 g/kWh, 12.81 g/kWh and 8.22 g/kWh at 100% load, 75% load and 50% load, respectively. With an increase of solar power input, the boiler efficiency, overall system efficiency and solar thermal-to-electricity efficiency shown a downward trend. . Please refer to any applicable publisher terms of use.the daily coal consumption of summer solstice is the lowest while the winter solstice is the highest for a particular SM and TES hour. Nomenclature Abbreviations CSPConcentrated solar power ECO Economizer FPS First platen super-heater FS Final super-heater HP High pressure turbine HR High temperature re-heater IP Intermediate pressure turbine LP Low pressure turbine LR Low-temperature re-heater MSHE Molten salt heat exchanger SACP Solar aided coal-fired power system SEP Steam separator SM Solar multiple SPS Second platen super-heater STACP Solar tower aided coal-fired power system TES Thermal energy storage Greek Symbols α solar absorptance γi specific enthalpy drop of drain water in the ith heater, kJ/kg ∆Texg temperature difference between the assumed and calculated temperature of the exit flue gas, K ∆tFPS,in temperature difference between the assumed and calculated inlet temperature of FPS, ℃ ∆Thotair temperature difference between the assumed and calculated temperature of hot air, K ∆TLMTD logarithmic mean temperature difference, K ∆tSEP,out temperature difference between the assumed and calculated outlet temperature of SEP, ℃ ∆α air leakage ratio δQboiler heat difference between the assumed and calculated Qboiler, kJ/kg ε hemispherical emittance ηboiler boiler's thermal efficiency ηhel heliostat efficiency ηsolar solar thermal-to-electricity efficiency ηSTACP thermal efficiency of STACP system λ thermal conductivity of molten salt, W/(m K) ρ density of molten salt, kg/m 3 ρ CO 2 density of CO2, kg/m 3 σ0 Stefan-Boltzmann constant, 5.67×10 -8 W/(m 2 K 4 ) τi specific enthalpy change of feed-water in the ith heater, kJ/kg φ heat retention factor Mathematical Symbols Ah area of heating surface, m 2 Ahel area of a heliostat, m 2 Ar lateral surface of the tube, m 2 axt system emissivity Bj calculation coal consumption rate, kg/s bs standard coal consumption rate, kg/kWh cp specific heat of molten salt at constant pressure, J/(kg K) DNI direct ...

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Economic and exergoeconomic investigation of 660 MW coal-fired power plant

Nikam

Jilte

2020

J Therm Anal Calorim

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Comparative exergoeconomic assessment of coal-fired power plants – Binary Rankine cycle versus conventional steam cycle

Cited by 20 publications

References 24 publications

A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

Off-design thermodynamic performances of a solar tower aided coal-fired power plant for different solar multiples with thermal energy storage

Economic and exergoeconomic investigation of 660 MW coal-fired power plant

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