Performance optimization of combined supercritical CO2 recompression cycle and regenerative organic Rankine cycle using zeotropic mixture fluid

Hou, Shengya; Cao, Sheng; Yu, Liang; Zhou, Yaodong; Wu, Yuandan; Zhang, Fengyuan

doi:10.1016/j.enconman.2018.04.025

Cited by 50 publications

(14 citation statements)

References 26 publications

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“…to 45.12%) than that from 200 bar to 300 bar (efficiency increases from 45.12% to 47.63%). It needs to be highlighted, however, that such linear and non-linear trends for temperature and pressure, respectively, are in agreement with the results reported for s-CO 2 cycles in different applications [29][30][31][32]. intolerable.…”

Section: Sensitivity Analysissupporting

confidence: 83%

Staged oxy-fuel natural gas combined cycle

Khallaghi

Hanak

2019

Applied Thermal Engineering

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Exhaust gas recirculation (EGR) in conventional natural gas-fired oxy-combustion cycles is required to maintain the combustion temperature at an allowable level. However, EGR is not beneficial from the system performance perspective. It is difficult to achieve in oxy-fuel cycles due to the high pressure and increased pressure drop in such systems. Consequently, alternative options to control the combustion temperature need to be considered. In this study, staged oxy-fuel natural gas combined cycle (SOF-NGCC) was proposed, which does not require EGR, and its feasibility was evaluated. A process model was developed in Aspen Plus in order to evaluate the thermodynamic performance of the proposed system and to benchmark it against the Allam cycle and conventional NGCC. The optimum net efficiency of the proposed cycle (47.63-51.32%) was shown to be lower than that for Allam cycle (54.58%) and the conventional NGCC without post-combustion capture (PCC) (56.95%). However, the SOF-NGCC is less complex and requires smaller equipment than the Allam cycle. This is mostly because the combined volumetric flow rate into expanders in both topping and bottoming cycles is approximately 25% of that estimated for the Allam cycle. Moreover, with a backpressure of 35 bar, no further compression is required prior to the CO 2 purification unit.

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Section: Sensitivity Analysissupporting

confidence: 83%

Staged oxy-fuel natural gas combined cycle

Khallaghi

Hanak

2019

Applied Thermal Engineering

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“…Hou et al (2018) carry out the optimization of a combined sCO 2 recompression cycle ( T max = 750°) with a regenerative ORC using a zeotropic mixture fluid. On the other hand, Mohammadi et al (2020) propose a layout for a hybrid CR‐GT‐sCO 2 solar plant, reaching high maximum temperatures (1000°C).…”

Section: Solar Plants Based On Advanced Power Cyclesmentioning

confidence: 99%

“…Along that research line, Song et al (2018) explore the potential of adding a bottoming ORC in the sCO 2 cycle to improve its thermal performance, carrying out a parametric optimization of that combined cycle, and Singh and Mishra (2018) analyze a solar PTC plant feeding a similar combined cycle (a recuperative sCO 2 and bottoming ORC). In both cases the sCO 2 cycle do not include recompression and the maximum temperature is lower than 400 C. Hou et al (2018) carry out the optimization of a combined sCO 2 recompression cycle (T max = 750 ) with a regenerative ORC using a zeotropic mixture fluid. On the other hand, Mohammadi et al (2020) propose a layout for a hybrid CR-GT-sCO 2 solar plant, reaching high maximum temperatures (1000 C).…”

Section: Supercritical Co 2 Brayton Cyclementioning

confidence: 99%

Thermodynamic cycles for solar thermal power plants: A review

Muñoz

Rovira

Montes

2021

WIREs Energy & Environment

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Solar thermal power plants for electricity production include, at least, two main systems: the solar field and the power block. Regarding this last one, the particular thermodynamic cycle layout and the working fluid employed, have a decisive influence in the plant performance. In turn, this selection depends on the solar technology employed. Currently, the steam Rankine cycle is the most widespread and commercially available option, usually coupled to a parabolic trough solar field. However, other configurations have been implemented in solar thermal plants worldwide. Most of them are based on other solar technologies also coupled to a steam Rankine cycle, although integrated solar combined cycles have a significant level of implementation. In the first place, power block configurations based on conventional thermodynamic cycles—Rankine, Brayton, and combined Brayton–Rankine—are described. The achievements and challenges of each proposal are highlighted, for example, the benefits involved in hybrid solar source/fossil fuel plants. In the second place, proposals of advanced power block configurations are analyzed, standing out: supercritical CO2 Brayton cycles, advanced organic Rankine cycles, and innovative integrated solar combined cycles. Each of these proposals shows some advantages compared to the conventional layouts in certain power or source temperature ranges and hence they could be considered attractive options in the medium term. At last, a brief review of proposals of solar thermal integration with other renewable heat sources is also included. This article is categorized under: Concentrating Solar Power > Systems and Infrastructure Energy Efficiency > Systems and Infrastructure Energy Research & Innovation > Systems and Infrastructure

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“…The results indicated that zeotropic mixtures showed a higher performance than one-component working fluids. A comparison of thermodynamic and exergoeconomic performances for supercritical CO 2 recompression cycle combined with regenerative organic Rankine cycle using the zeotropic mixture as working fluid was reported in [18]. In [19], a complex thermo-economic-environmental optimization and advanced exergy analysis were applied for a dual-loop organic Rankine cycle (DORC) using zeotropic mixtures.…”

Section: Introductionmentioning

confidence: 99%

Exergy-Based Multi-Objective Optimization of an Organic Rankine Cycle with a Zeotropic Mixture

Fergani

Morosuk

Touil

2021

Entropy

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In this paper, the performance of an organic Rankine cycle with a zeotropic mixture as a working fluid was evaluated using exergy-based methods: exergy, exergoeconomic, and exergoenvironmental analyses. The effect of system operation parameters and mixtures on the organic Rankine cycle’s performance was evaluated as well. The considered performances were the following: exergy efficiency, specific cost, and specific environmental effect of the net power generation. A multi-objective optimization approach was applied for parametric optimization. The approach was based on the particle swarm algorithm to find a set of Pareto optimal solutions. One final optimal solution was selected using a decision-making method. The optimization results indicated that the zeotropic mixture of cyclohexane/toluene had a higher thermodynamic and economic performance, while the benzene/toluene zeotropic mixture had the highest environmental performance. Finally, a comparative analysis of zeotropic mixtures and pure fluids was conducted. The organic Rankine cycle with the mixtures as working fluids showed significant improvement in energetic, economic, and environmental performances.

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Performance optimization of combined supercritical CO2 recompression cycle and regenerative organic Rankine cycle using zeotropic mixture fluid

Cited by 50 publications

References 26 publications

Staged oxy-fuel natural gas combined cycle

Staged oxy-fuel natural gas combined cycle

Thermodynamic cycles for solar thermal power plants: A review

Exergy-Based Multi-Objective Optimization of an Organic Rankine Cycle with a Zeotropic Mixture

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