The STEP 10 MWe sCO2 Pilot Demonstration Status Update

Marion, John; Macadam, Scott; McClung, Aaron; Mortzheim, Jason

doi:10.1115/gt2022-83588

Cited by 4 publications

(4 citation statements)

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“…Moore et al designed a high-temperature and high-pressure S-CO2 flow circuit with a flow rate equivalent to 1 MWe [27]. The STEP project executed by Gas Technology Institute (GTI), Southwest Research Institute (SwRI) and General Electric Global Research (GEGR), was to design, construct, commission and operate a 10 MWe pilot plant [28]. Xi'an Thermal Power Research Institute (TPRI) designed and constructed a megawatt-level integral test facility, which was operated for more than 1000 hours [29] [30].…”

Section: S-co2 Power Cyclementioning

confidence: 99%

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A review of research on turbines for supercritical carbon dioxide power systems

Hu,

Jiang,

Zhuge

et al. 2024

J. Phys.: Conf. Ser.

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Supercritical carbon dioxide (S-CO2) Brayton cycle has been known as a potential power cycle technology because of its high efficiency, compact structure and suitability for different heat sources. As one of the key components in the cycle, the turbine has an important impact on the cycle efficiency. Compared with traditional steam and gas turbines, S-CO2 turbines have high working pressure and small size. The internal flow characteristics are significantly different. In this paper, the research progress of S-CO2 turbines in recent years is reviewed. The design and performance evaluation methods for S-CO2 turbines of different types and power levels are summarized, and research on loss correlations and optimization algorithms are introduced. The features of flow field in S-CO2 turbines are discussed. Current studies mainly evaluate the flow field and flow losses through Computational Fluid Dynamics (CFD), and some studies further analyze the influencing mechanism of turbine geometric parameters on flow characteristics. The applications of multi-physical field analysis on S-CO2 turbines are also reviewed. The construction and operation of S-CO2 test loops, and relevant turbine experimental study findings are introduced. Future research directions of S-CO2 turbines are proposed.

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Section: S-co2 Power Cyclementioning

confidence: 99%

“…Experimental research on MW level turbines has also been carried out. A 10 MWe S-CO2 turbine was manufactured by SwRI(Southwest Research Institute) and GE(General Electric) and tested at 715 ℃ and 27,000 rpm [28]. The rotor life increased from 20000 hours to 100000 hours.…”

Section: Experimental Studies Of S-co2 Turbinesmentioning

confidence: 99%

A review of research on turbines for supercritical carbon dioxide power systems

Hu,

Jiang,

Zhuge

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

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“…The second key advantage of sCO 2 cycles is the dramatic reduction in size of cycle components, which is again correlated to the high density of supercritical CO 2 [29,30].…”

Section: Compactness Of Sco 2 Power Unitsmentioning

confidence: 99%

“…These difficulties, not anticipated by the precursors of the technology, are linked to marked specificities of sCO 2 cycles, in particular their high pressures but low-pressure ratios, the difficulty of controlling CO 2 leaks and the unusually small dimensions of certain components, which require unconventional designs. That technology is therefore still in the engineering and testing phase, with the most consistent and active program being currently the so-called "Supercritical Transformational Electric Power" (STEP), funded by the US Department of Energy (DOE) [1,2].…”

Section: Introductionmentioning

confidence: 99%

Supercritical CO2 Power Technology: Strengths but Challenges

Molière,

Privat,

Jaubert

et al. 2024

Energies

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In the late 1960s, a handful of inspired researchers predicted the great potential of supercritical CO2 (“sCO2”) cycles for the production of electricity and highlighted the prospects for dramatic reductions in component sizes and efficiency increases. Since then, considerable development programs have been deployed around the world to “tame” this new technology. Despite these efforts, in-depth engineering studies and extensive testing are still necessary today before viable designs can be released for large-scale industrial applications. This raises questions as to the reasons for this delay, this debate being rarely addressed in the current literature. This situation has motivated the present study. Trying to unravel such an intricate topic requires to understand the distinctive properties of supercritical CO2 and the particular requirements of closed, high-pressure power systems. This article aims then to provide a broad overview of sCO2 power cycles, highlighting their main advantages and limitations and reflecting the challenges associated with the industrialization of that technology which actually requires disruptive and innovative designs.

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Sliding Pressure Inventory Control of a Supercritical CO2 Cycle for Concentrated Solar Power—Analysis and Implications

Seshadri¹,

Kumar²

2023

Journal of Solar Energy Engineering

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This paper presents the use of Sliding Pressure Inventory Control (SPIC) for a 10 MW supercritical Carbon dioxide Brayton cycle for Concentrated Solar Power, incorporating Printed Circuit Heat Exchangers. Load regulation using SPIC for three representative ambient conditions 45 °C, 30 °C, and 15 °C are considered. While a wide operating range from 10 MW to less than 1 MW part load is obtained, a notable cycle efficiency decline at part load is also seen. Irreversibility analysis reveals that deterioration in recuperator and turbomachinery performance are primarily responsible for cycle performance degradation at part load. Nevertheless, useful inferences are obtained from the 10 MW SPIC irreversibility study. With a slightly increased value of heat exchanger length, a non-condensing 1 MW sub-critical CO2 cycle operating between 35 bar/53 bar is found to be as efficient as a 1 MW supercritical CO2 cycle operating between 88 bar/210 bar. The major benefit of choosing the sub-critical CO2 cycle for 1 MW scale applications is the significantly reduced turbomachinery speed (~26,000 rpm) in comparison with supercritical CO2 turbomachinery (~67,000 rpm) for the same power scale. These advantages are found to be true for air-based ideal gas cycles operating between 35 bar/53 bar too, with the latter requiring nominally smaller heat exchangers than the sub-critical CO2 cycle. The final choice of working fluid, however, for these low pressure cycles would depend on practical considerations, such as material compatibilities at high temperatures, corrosion considerations, and cost.

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The STEP 10 MWe sCO2 Pilot Demonstration Status Update

Cited by 4 publications

References 0 publications

A review of research on turbines for supercritical carbon dioxide power systems

A review of research on turbines for supercritical carbon dioxide power systems

Supercritical CO2 Power Technology: Strengths but Challenges

Sliding Pressure Inventory Control of a Supercritical CO2 Cycle for Concentrated Solar Power—Analysis and Implications

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