The flow path characteristics analysis for supercritical carbon dioxide gas turbines

Rogalev, Andrey; Rogalev, Nikolay; Kindra, Vladimir; Grigoriev, E. Y.; Makhmutov, Bulat

doi:10.1051/e3sconf/201912401006

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…49 . rotating the electric generator [10]. Downstream of the turbine, the exhausted carbon dioxide enters the regenerative heat exchanger, and then into the water separator, where the condensed steam is removed.…”

Section: Introductionmentioning

confidence: 99%

Development and Research of the Topology of Cooling Baffles for Blades of the Axial Carbon Dioxide Turbines

Komarov¹

2022

Eurasian phys. tech. j.

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Currently, there is an increase in average annual temperature and climate change across the various continents. Carbon dioxide emissions from energy facilities contributed to this condition. Implementation of oxy-fuel cycles is a promising solution for reducing carbon dioxide emissions from the energy sector. To date, the most efficient oxy-fuel cycle is the Allam cycle. In this cycle supercritical carbon dioxide acts as a working fluid of the cycle, wherein СО2’s temperature upstream of the turbine is 1,150 °С and the pressure is 30 MPa. Due to the high temperature of the working fluid, it is necessary to cool first stages of the carbon dioxide turbine. The feature of considered cooling system in this turbine is that carbon dioxide being used as a refrigerant too. This paper investigated two topologies of convective cooling systems in the carbon dioxide turbine’s nozzle blade as well as considers an option for increasing the intensity of heatexchange through the use of helical ribbing in the cylindrical cooling baffle. Numerical simulation involving the ANSYS software package was performed for two topologies of the cooling baffles arrangement in the nozzle blade body: configuration 1 -with 17 baffles of 1 mm diameter, configuration 2 -with three baffles of the blade profile shape. Configuration 1 proved to be more efficient: the Nusselt number has a value of 117, and average value of the heat transfer coefficient on the refrigerant side is 6,413 W/m2∙K. The effect of using helical ribbing in the cooling cylindrical baffle of the blade under study was investigated, which enabled to reduce the metal temperature by 54 °С on average and doubled the heat transfer coefficient.

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Section: Introductionmentioning

confidence: 99%

Development and Research of the Topology of Cooling Baffles for Blades of the Axial Carbon Dioxide Turbines

Komarov¹

2022

Eurasian phys. tech. j.

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“…The studies [8,9] present the results of developing a carbon dioxide turbine for the Allam cycle with a capacity of 335 MW, which has seven stages. The pressure and the temperature upstream of this turbine are 1083 • C and 30 MPa, respectively.…”

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 Development of Recommendations for the Design of the Carbon Dioxide Turbine’s Axial Flow Paths for Oxy-Fuel Combustion Power Cycles

Osipov¹,

Makhmutov²,

Sklyar³

et al. 2022

Smart Innovation, Systems and Technologies

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The flow path characteristics analysis for supercritical carbon dioxide gas turbines

Cited by 4 publications

References 9 publications

Development and Research of the Topology of Cooling Baffles for Blades of the Axial Carbon Dioxide Turbines

Development and Research of the Topology of Cooling Baffles for Blades of the Axial Carbon Dioxide Turbines

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

The Development of Recommendations for the Design of the Carbon Dioxide Turbine’s Axial Flow Paths for Oxy-Fuel Combustion Power Cycles

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