Effect of Impurities on Compressor and Cooler in Supercritical CO2 Cycles

Veselý, Ladislav; Manikantachari, K. R. V.; Vasu, Subith; Kapat, Jayanta; Dostál, Václav; Martin, Scott M.

doi:10.1115/1.4040581

Cited by 38 publications

(13 citation statements)

References 17 publications

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“…However, due to the fact that T c is different for various mixtures, this assumption will cause the performance comparison of mixtures under different compressor inlet temperatures. (2) For the work of Vesely et al [24,25] and Guo et al [23], the range of employed gas fraction is too less. Although Baik and Lee [22] considered the whole fraction range 0-1, most of the employed additives belong to organic fluids, which may decompose in the high temperature.…”

Section: Current Status Of Co 2 -Based Mixturesmentioning

confidence: 99%

“…They found that all researched mixtures except CO 2 -H 2 S had negative effects on the cycle efficiency and net power output. Thereafter, they examined the effect of different impurity compositions on the performance of various cycle components at different inlet temperatures of main compressor [25]. The above studies on the Brayton cycle with CO 2 -based mixtures are summarized in Table 1.…”

Section: Current Status Of Co 2 -Based Mixturesmentioning

confidence: 99%

“…Table 1 lists the considered CO 2 -based mixtures in the existing studies. Thermodynamic properties of these mixtures are always obtained by REFPROP [19][20][21][22][23][24][25][26]. According to the shift direction of critical temperature, these mixtures can be classified into two groups: the ascending critical temperature group and the descending critical temperature group.…”

Section: Cycle Layoutmentioning

confidence: 99%

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New Knowledge on the Performance of Supercritical Brayton Cycle with CO2-Based Mixtures

Zhao

et al. 2020

Energies

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As one of the promising technologies to meet the increasing demand for electricity, supercritical CO2 (S-CO2) Brayton cycle has the characteristics of high efficiency, economic structure, and compact turbomachinery. These characteristics are closely related to the thermodynamic properties of working fluid. When CO2 is mixed with other gas, cycle parameters are determined by the constituent and the mass fraction of CO2. Therefore, in this contribution, a thermodynamic model is developed and validated for the recompression cycle. Seven types of CO2-based mixtures, namely CO2-Xe, CO2-Kr, CO2-O2, CO2-Ar, CO2-N2, CO2-Ne, and CO2-He, are employed. At different CO2 mass fractions, cycle parameters are determined under a fixed compressor inlet temperature, based on the maximization of cycle efficiency. Cycle performance and recuperators’ parameters are comprehensively compared for different CO2-based mixtures. Furthermore, in order to investigate the effect of compressor inlet temperature, cycle parameters of CO2-N2 are obtained under four different temperatures. From the obtained results, it can be concluded that, as the mass fraction of CO2 increases, different mixtures show different variations of cycle performance and recuperators’ parameters. In generally, the performance order of mixtures coincides with the descending or ascending order of corresponding critical temperatures. Performance curves of these considered mixtures locate between the curves of CO2-Xe and CO2-He. Meanwhile, the curves of CO2-O2 and CO2-N2 are always closed to each other at high CO2 mass fractions. In addition, with the increase of compressor inlet temperature, cycle performance decreases, and more heat transfer occurs in the recuperators.

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Section: Current Status Of Co 2 -Based Mixturesmentioning

confidence: 99%

Section: Current Status Of Co 2 -Based Mixturesmentioning

confidence: 99%

Section: Cycle Layoutmentioning

confidence: 99%

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New Knowledge on the Performance of Supercritical Brayton Cycle with CO2-Based Mixtures

Zhao

et al. 2020

Energies

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“…Valencia et al (2020), in their study on the influence of mixtures, concludes that there are two groups: mixtures that decrease the critical temperature (s-CO2/He, s-CO2/Kr, s-CO2/CH4 y s-CO2/C2H6) and mixtures that increase the critical temperature (s-CO2/COS, s-CO2/H2S, s-CO2/NH3, s-CO2/SO2, s-CO2/C5H10, s-CO2/C5H12), among others. So far, several studies have been conducted to discuss the feasibility and performance of the CO2-based supercritical mixtures power cycle [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Supercritical CO2 Binary Mixtures for Recompression Brayton s-CO2 Power Cycles Coupled to Solar Thermal Energy Plants

Tafur-Escanta¹,

Valencia-Chapi²,

López‐Paniagua³

et al. 2021

Preprint

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In this work, an evaluation and quantification of the impact of using mixtures based on Supercritical Carbon Dioxide "s-CO2" (s-CO2/COS, s-CO2/H2S, s-CO2/NH3, s-CO2/SO2) are made as a working fluid in simple and complex recompression Brayton s-CO2 power cycles configurations that have pressure drops in their components. These cycles are coupled to a solar thermal plant with parabolic-trough collector (PTC) technology. The methodology used in the calculation performance is to establish values of the heat recuperator total conductance (UAtotal) between 5 and 25 MW/K. The main conclusion of this work is that the cycle's efficiency has improved due to s-CO2 mixtures as working fluid; this is significant compared to that obtained using the standard fluid (pure s-CO2). Furthermore, a techno-economic analysis is carried out that compares each configuration's costs using pure s-CO2 and a mixture of s-CO2/COS with a molar fraction (70/30) respectively as working fluid where relevant results are obtained. These results show that the best configuration in terms of thermal efficiency and cost is the RCC-RH for pure sCO2 with values of 41.25% and 2811 $/kWe, while for the mixture sCO2/COS, the RCC-2RH configuration with values of 45, 05% and 2621 $/kWe is optimal. Using the mixture costs 6.75% less than if it is used the standard fluid (s-CO2).

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“…Running this described system at supercritical conditions can further cut costs and increase efficiency as the combined oxy-methane, with higher density supercritical CO2 diluent (sCO2), requires less pumping power for the same power output, while running with high power output comparable to conventional cycles (see refs. [2][3][4][5][6][7] for sCO2 power cycles).…”

Section: Introductionmentioning

confidence: 99%

Effects of High Fuel Loading and CO2 Dilution on Oxy-Methane Ignition Inside a Shock Tube at High Pressure

Laich

Baker

Ninnemann

et al. 2020

Journal of Energy Resources Technology

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Ignition delay times were measured for methane/O2 mixtures in a high dilution environment of either CO2 or N2 using a shock tube facility. Experiments were performed between 1044 K and 1356 K at pressures near 16 ± 2 atm. Test mixtures had an equivalence ratio of 1.0 with 16.67% CH4, 33.33% O2, and 50% diluent. Ignition delay times were measured using OH* emission and pressure time-histories. Data were compared to the predictions of two literature kinetic mechanisms (ARAMCO MECH 2.0 and GRI Mech 3.0). Most experiments showed inhomogeneous (mild) ignition which was deduced from five time-of-arrival pressure transducers placed along the driven section of the shock tube. Further analysis included determination of blast wave velocities and locations away from the end wall of initial detonations. Blast velocities were 60–80% of CJ-Detonation calculations. A narrow high temperature region within the range was identified as showing homogenous (strong) ignition which showed generally good agreement with model predictions. Model comparisons with mild ignition cases should not be used to further refine kinetic mechanisms, though at these conditions, insight was gained into various ignition behavior. To the best of our knowledge, we present first shock tube data during ignition of high fuel loading CH4/O2 mixtures diluted with CO2 and N2.

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Effect of Impurities on Compressor and Cooler in Supercritical CO2 Cycles

Cited by 38 publications

References 17 publications

New Knowledge on the Performance of Supercritical Brayton Cycle with CO2-Based Mixtures

New Knowledge on the Performance of Supercritical Brayton Cycle with CO2-Based Mixtures

Supercritical CO2 Binary Mixtures for Recompression Brayton s-CO2 Power Cycles Coupled to Solar Thermal Energy Plants

Effects of High Fuel Loading and CO2 Dilution on Oxy-Methane Ignition Inside a Shock Tube at High Pressure

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