Test Plan and Preliminary Test Results of a Bench Scale Closed Cycle Gas Turbine With Super-Critical CO2 as Working Fluid

Hasuike, Hiroshi; Yamamoto, Takashi; Fukushima, Toshihiko; Watanabe, Toshinori; Utamura, Motoaki; Aritomi, Masanori

doi:10.1115/gt2010-22171

Cited by 4 publications

(5 citation statements)

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“…During 2010 the loop was configured with a 260 kW heater, and the simple recuperated Brayton cycle was able to reach break-even conditions. The Institute of Applied Energy (IAE) and Tokyo Institute of Technology constructed a S-CO2 demonstration loop to develop a closed cycle to generate power from industrial waste heat of a not high temperature range [22] [15]. Their preliminary test results indirectly proved that S-CO2 as the working fluid would reduce the compression power consumption near the critical point.…”

Section: S-co2 Power Cyclementioning

confidence: 99%

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%

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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“…Instead, it was generated by Barber‐Nichols Inc. using proprietary in‐house modeling tools 63 . The Tokyo Institute of Technology first demonstrated its plan to develop a 10 kW‐scale sCO 2 power cycle gas turbine and a primary component specification in 2010 64 . The designed thermal efficiency was 15% at a compressor outlet pressure of 12 MPa, turbine inlet temperature of 550 K, and MF rate of 1.2 kg/s.…”

Section: Introductionmentioning

confidence: 99%

“…63 The Tokyo Institute of Technology first demonstrated its plan to develop a 10 kW-scale sCO 2 power cycle gas turbine and a primary component specification in 2010. 64 The designed thermal efficiency was 15% at a compressor outlet pressure of 12 MPa, turbine inlet temperature of 550 K, and MF rate of 1.2 kg/s. The test results of a 40-min power generation period were published.…”

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confidence: 99%

Demonstration of a small‐scale power generator using supercritical CO₂

Li,

Tian,

Lin

et al. 2024

Carbon Energy

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The supercritical CO2 (sCO2) power cycle could improve efficiencies for a wide range of thermal power plants. The sCO2 turbine generator plays an important role in the sCO2 power cycle by directly converting thermal energy into mechanical work and electric power. The operation of the generator encounters challenges, including high temperature, high pressure, high rotational speed, and other engineering problems, such as leakage. Experimental studies of sCO2 turbines are insufficient because of the significant difficulties in turbine manufacturing and system construction. Unlike most experimental investigations that primarily focus on 100 kW‐ or MW‐scale power generation systems, we consider, for the first time, a small‐scale power generator using sCO2. A partial admission axial turbine was designed and manufactured with a rated rotational speed of 40,000 rpm, and a CO2 transcritical power cycle test loop was constructed to validate the performance of our manufactured generator. A resistant gas was proposed in the constructed turbine expander to solve the leakage issue. Both dynamic and steady performances were investigated. The results indicated that a peak electric power of 11.55 kW was achieved at 29,369 rpm. The maximum total efficiency of the turbo‐generator was 58.98%, which was affected by both the turbine rotational speed and pressure ratio, according to the proposed performance map.

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“…The merit of using supercritical CO 2 (sCO 2 ) as the working fluid of closed Brayton Cycle gas turbine is now widely recognized as it offers alternatives for solar, geo-thermal, and nuclear energy conversion. This technique relies on the reduced compression work of the working fluid performing close to the critical point while maintains a compact configuration compared with conventional cycles [1] which results in a strong real gas effect difficulties to be analyzed.…”

Section: Introductionmentioning

confidence: 99%

The Real Gas Effect on the Stagnation Properties for Supercritical Carbon Dioxide Flows

Xiao

Himeno

Watanabe

2020

JGPP

Self Cite

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This paper presents a comprehensive study on the stagnation properties namely the total pressure and total temperature for supercritical CO 2 flows including the methodology, applications and detailed analysis. Due to the high nonlinear real gas effect, it is practically impossible to have explicit expressions between static and its corresponding stagnation properties. The equations of obtaining the real gas stagnation properties as well as their physical meanings related to fluid dynamics need to be reconsidered. In this paper, the stagnation pressure and temperature for sCO 2 flows are accurately calculated in a way that implicitly iterated from stagnation enthalpy and entropy without any addendum assumptions. Accordingly, this approach is applied to typical applications that essentially exert stagnation properties. The total pressure and total temperature of typical sCO 2 flows in which contain significant real gas characteristics are numerically studied by using our in-house CFD code coupled with real gas models. It is found that the real gas tends to preserve more internal energy than the ideal gas during irreversible flow process especially with the presence of shockwaves. Finally, as a regular indicator of viscous flow loss, the total pressure loss for a sCO 2 compressor cascade is evaluated. NOMENCLATURE U Velocity in x-direction m/s V Velocity in y-direction m/s W Velocity in z-direction m/s T Static temperate K P Static pressure Pa h Static enthalpy J kg −1 K −1 s Static entropy J kg −1 K −1 u Magnitude of flow velocity m/s ρ Density Kg/m 3 T c Critical temperature 304.13K P c Critical pressure 7.3773MPa Non-dimensional parameters Z Compression factor

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Test Plan and Preliminary Test Results of a Bench Scale Closed Cycle Gas Turbine With Super-Critical CO2 as Working Fluid

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

Demonstration of a small‐scale power generator using supercritical CO₂

The Real Gas Effect on the Stagnation Properties for Supercritical Carbon Dioxide Flows

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Test Plan and Preliminary Test Results of a Bench Scale Closed Cycle Gas Turbine With Super-Critical CO2 as Working Fluid

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

Demonstration of a small‐scale power generator using supercritical CO2

The Real Gas Effect on the Stagnation Properties for Supercritical Carbon Dioxide Flows

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Demonstration of a small‐scale power generator using supercritical CO₂