Supercritical carbon dioxide gas turbines for high-power generation

Zaryankin, A. E.; Rogalev, Andrey; Osipov, Sergey; Kindra, Vladimir

doi:10.1063/1.5081659

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…The inlet parameters of the supercritical CO2 gas turbine determine small specific volumes about 0.01 m 3 /kg that influence dimensions of the first stages. It is desirable to use blades longer than 15 mm as to reduce the turbine cascade losses, first of all, the secondary losses [8][9][10]. Usually, this is achieved by reduction of the stage mean diameter.…”

Section: Turbo-machine Design Methodsmentioning

confidence: 99%

The flow path characteristics analysis for supercritical carbon dioxide gas turbines

Rogalev

Kindra

et al. 2019

E3S Web Conf.

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Rising carbon dioxide concentration in the atmosphere is probably the main reason of global warming. The development of the oxy-fuel combustion cycles is a possible way to decrease the energy sector contribution in the emission process. However, an unusual composition and thermodynamic parameters of the working fluid cause the necessity of revision of the main equipment characteristics, especially for the supercritical carbon dioxide gas turbine. This study presents the method and the results of the flow path preliminary analysis for the new generation gas turbines working on carbon dioxide. The flow path shape with a constant root diameter of seven stages was chosen as the most reasonable due to cheap manufacturing. Influence of reaction degree of stages and velocity ratio on stage geometric parameters are revealed. It was found that the optimal reaction degree and velocity ratio are equal to 0.25 and 0.36 correspondingly. Thermal and constructive stages characteristics of the 350 MW turbine are determined.

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Section: Turbo-machine Design Methodsmentioning

confidence: 99%

The flow path characteristics analysis for supercritical carbon dioxide gas turbines

Rogalev

Kindra

et al. 2019

E3S Web Conf.

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“…The study [7] presents a sketch of the flow path for a 400 MW Allam cycle carbon dioxide turbine. This turbine has 9 stages and a rotor with a decreasing root diameter.…”

Section: Introductionmentioning

confidence: 99%

Influence of Kinematic Parameters of Carbon Dioxide Turbine on Its Coefficient of Efficiency and Dimensions

Osipov

Zlyvko²,

Miliukov³

et al. 2022

Inventions

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To reduce carbon dioxide emissions into the environment, the energy sector develops oxygen-fuel energy cycles. One of the most promising cycles is the Allam cycle that features the highest efficiency of electricity generation among all others. One of the main elements of an oxy-fuel energy cycle is a high-temperature carbon dioxide turbine. The turbine’s working fluid and coolant consist predominantly of carbon dioxide at a supercritical pressure. Currently, there are no recommendations in the literature for the design of carbon dioxide turbines for an oxy-fuel energy system (OFES) operating according to the Allam cycle; therefore, there is a need to study the influence of parameters of the flow path of carbon dioxide turbines on its efficiency and overall performance. In this paper, we have presented the results of one-dimensional calculations of a flow path of the carbon dioxide turbine for the Allam cycle with a capacity of 300 MW, with an initial temperature and pressure of 1100 °C and 30 MPa, and an outlet pressure of 3 MPa. The study was carried out by varying the rotor speed, the reactivity level and the average diameter. Based on the results of one-dimensional calculations, we have found that the highest efficiency of the turbine flow path is achieved at a speed of 471 rad/s, a reactivity of 0.5, and an average diameter of 1.1 m for the first stage.

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“…The high density of carbon dioxide at given turbine inlet and outlet conditions leads to S-CO 2 turbine mass and dimensions being smaller than those of the steam or gas turbines. The airfoil grid friction losses in an S-CO 2 turbine will be smaller than those in a steam or gas turbine because of carbon dioxide s smaller viscosity [10].…”

Section: Introduction 1promising Way To Increase Efficiency and Decrease The Capital Cost Of Nuclear Power Plantsmentioning

confidence: 99%

Structural and Parametric Optimization of S–CO2 Nuclear Power Plants

Rogalev

Kindra

et al. 2021

Entropy

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The transition to the use of supercritical carbon dioxide as a working fluid for power generation units will significantly reduce the equipment′s overall dimensions while increasing fuel efficiency and environmental safety. Structural and parametric optimization of S–CO2 nuclear power plants was carried out to ensure the maximum efficiency of electricity production. Based on the results of mathematical modeling, it was found that the transition to a carbon dioxide working fluid for the nuclear power plant with the BREST–OD–300 reactor leads to an increase of efficiency from 39.8 to 43.1%. Nuclear power plant transition from the Rankine water cycle to the carbon dioxide Brayton cycle with recompression is reasonable at a working fluid temperature above 455 °C due to the carbon dioxide cycle′s more effective regeneration system.

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Supercritical carbon dioxide gas turbines for high-power generation

Cited by 8 publications

References 3 publications

The flow path characteristics analysis for supercritical carbon dioxide gas turbines

The flow path characteristics analysis for supercritical carbon dioxide gas turbines

Influence of Kinematic Parameters of Carbon Dioxide Turbine on Its Coefficient of Efficiency and Dimensions

Structural and Parametric Optimization of S–CO2 Nuclear Power Plants

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