Design of Experimental Loop With Supercritical Carbon Dioxide

Veselý, Ladislav; Dostál, Václav; Hájek, Petr

doi:10.1115/icone22-30798

Cited by 7 publications

(5 citation statements)

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“…The characteristics of the optimized BTC are presented in Table 2 . The turbine inlet condition is fixed at 550 °C and 20 MPa to be parallel with the part-flow sCO 2 cycles designs in the literature [ 32 , 39 , 40 , 41 , 42 , 43 ]. The heat rejection from BTC was transferred the BBC through the cooler.…”

Section: Novel Hybrid Geothermal–biomass Power Plant Schemementioning

confidence: 99%

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Mutlu

Baker

Kazanç

2021

Entropy

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This study investigates the hybridization scenario of a single-flash geothermal power plant with a biomass-driven sCO2-steam Rankine combined cycle, where a solid local biomass source, olive residue, is used as a fuel. The hybrid power plant is modeled using the simulation software EBSILON®Professional. A topping sCO2 cycle is chosen due to its potential for flexible electricity generation. A synergy between the topping sCO2 and bottoming steam Rankine cycles is achieved by a good temperature match between the coupling heat exchanger, where the waste heat from the topping cycle is utilized in the bottoming cycle. The high-temperature heat addition problem, common in sCO2 cycles, is also eliminated by utilizing the heat in the flue gas in the bottoming cycle. Combined cycle thermal efficiency and a biomass-to-electricity conversion efficiency of 24.9% and 22.4% are achieved, respectively. The corresponding fuel consumption of the hybridized plant is found to be 2.2 kg/s.

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Section: Novel Hybrid Geothermal–biomass Power Plant Schemementioning

confidence: 99%

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Mutlu

Baker

Kazanç

2021

Entropy

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“…Recompression cycles are known to take maximum advantage of this property variation of CO 2 near the critical point, and thus they are better and more efficient than other configurations [ 3 , 4 , 5 , 6 ]. Furthermore, S-CO 2 Brayton cycles are a much more viable alternative to other thermodynamics cycles due to the following advantages: (a) Improved safety as CO 2 is a non-toxic, stable, non-combustible [ 7 ], (b) structural simplicity and compactness [ 8 , 9 ], (c) low capital and maintenance cost [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Proposal and Thermodynamic Assessment of S-CO2 Brayton Cycle Layout for Improved Heat Recovery

Siddiqui

Almitani

2020

Entropy

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This article deals with the thermodynamic assessment of supercritical carbon dioxide (S-CO 2 ) Brayton power cycles. The main advantage of S-CO 2 cycles is the capability of achieving higher efficiencies at significantly lower temperatures in comparison to conventional steam Rankine cycles. In the past decade, variety of configurations and layouts of S-CO 2 cycles have been investigated targeting efficiency improvement. In this paper, four different layouts have been studied (with and without reheat): Simple Brayton cycle, Recompression Brayton cycle, Recompression Brayton cycle with partial cooling and the proposed layout called Recompression Brayton cycle with partial cooling and improved heat recovery (RBC-PC-IHR). Energetic and exergetic performances of all configurations were analyzed. Simple configuration is the least efficient due to poor heat recovery mechanism. RBC-PC-IHR layout achieved the best thermal performance in both reheat and no reheat configurations (η th = 59.7% with reheat and η th = 58.2 without reheat at 850 • C), which was due to better heat recovery in comparison to other layouts. The detailed component-wise exergy analysis shows that the turbines and compressors have minimal contribution towards exergy destruction in comparison to what is lost by heat exchangers and heat source.Entropy 2020, 22, 305 2 of 19 than that of turbomachines. Sarkar and Bhattacharyya [15] did sensitivity analysis to reach optimized thermal performance of S-CO 2 recompression Brayton cycle with reheating. They observed maximum 3.5% improvement in thermal efficiency with reheating at optimum operating conditions.Al-Sulaiman and Atif [16] investigated the thermodynamic performance of various S-CO 2 Brayton cycles integrated with solar power tower. Their findings demonstrated that the recompression cycle has the highest thermal efficiency and the highest net power output, whereas, regenerative cycle stands second. Later, they performed detailed energy and exergy analysis of recompression cycles driven by solar thermal systems. They concluded that the highest average exergy loss occurs in heliostat field [17]. Kim et al. [18] discussed thermodynamic performance of nine S-CO 2 bottoming power cycles with topping gas turbine cycle powered by landfill gas. They found recompression cycle is not best suited for waste heat recovery purposes due to limited fraction of heat recovery from exhaust gas. On the other hand, partial heating cycle, being simple with single compressor and turbine, has relatively higher power density. Gavic [19] investigated various options for the heat rejection from the S-CO 2 cycle including wet cooling, dry cooling and hybrid. He found that the hybrid cooling is flexible with reduced water usage and capital cost. Sing et al. [20] developed a model for dynamic simulation of S-CO 2 Brayton cycle heated directly via parabolic trough collectors. He found that the active control of solar collectors is necessary to maintain the supercritical operation of the cycle and to improve power output in winte...

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“…The supercritical carbon dioxide (S-CO 2 ) Brayton cycle (BC) has been extensively studied in the last decade and is considered promising for exploiting lowto medium-grade heat for power generation [2]. No commercial S-CO 2 power plant has yet been installed; however, some pilot small-scale units are currently present [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis of the S-CO2 Brayton Cycle with Improved Heat Regeneration

Siddiqui

Almitani

2018

Processes

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Supercritical carbon dioxide (S-CO 2 ) Brayton cycles (BC) are promising alternatives for power generation. Many variants of S-CO 2 BC have already been studied to make this technology economically more viable and efficient. In comparison to other BC and Rankine cycles, S-CO 2 BC is less complex and more compact, which may reduce the overall plant size, maintenance, and the cost of operation and installation. In this paper, we consider one of the configurations of S-CO 2 BC called the recompression Brayton cycle with partial cooling (RBC-PC) to which some modifications are suggested with an aim to improve the overall cycle's thermal efficiency. The type of heat source is not considered in this study; thus, any heat source may be considered that is capable of supplying temperature to the S-CO 2 in the range from 500 • C to 850 • C, like solar heaters, or nuclear and gas turbine waste heat. The commercial software Aspen HYSYS V9 (Aspen Technology, Inc., Bedford, MA, USA) is used for simulations. RBC-PC serves as a base cycle in this study; thus, the simulation results for RBC-PC are compared with the already published data in the literature. Energy analysis is done for both layouts and an efficiency comparison is made for a range of turbine operating temperatures (from 500 • C to 850 • C). The heat exchanger effectiveness and its influence on both layouts are also discussed.

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Design of Experimental Loop With Supercritical Carbon Dioxide

Cited by 7 publications

References 0 publications

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Proposal and Thermodynamic Assessment of S-CO2 Brayton Cycle Layout for Improved Heat Recovery

Energy Analysis of the S-CO2 Brayton Cycle with Improved Heat Regeneration

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