Structural and Parametric Investigations of Oxy-Fuel Combustion Cycles with the Aim of Increasing Efficiency of Electricity Production

Kindra, Vladimir; Osipov, Sergey; Vegera, Andrey

doi:10.1109/eastconf.2019.8725415

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…The thermodynamic studies [32] show that the gas turbine cooling losses remarkably hurt the cycle thermal efficiency. An accurate assessment of these losses involves the influence of the turbine specific structural features and the new heat carrier thermophysical parameters.…”

Section: Mathematical Model Of the Cooled Carbon Dioxide Gas Turbinementioning

confidence: 99%

Research and Development of the Oxy-Fuel Combustion Power Cycles with CO2 Recirculation

Rogalev

Kindra

et al. 2021

Energies

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The transition to oxy-fuel combustion power cycles is a prospective way to decrease carbon dioxide emissions into the atmosphere from the energy sector. To identify which technology has the highest efficiency and the lowest emission level, a thermodynamic analysis of the semiclosed oxy-fuel combustion combined cycle (SCOC-CC), the E-MATIANT cycle, and the Allam cycle was carried out. The modeling methodology has been described in detail, including the approaches to defining the working fluid properties, the mathematical models of the air separation unit, and the cooled gas turbine cycles’ calculation algorithms. The gas turbine inlet parameters were optimized using the developed modeling methodology for the three oxy-fuel combustion power cycles with CO2 recirculation in the inlet temperature at a range of 1000 to 1700 °C. The effect of the coolant flow precooling was evaluated. It was found that a decrease in the coolant temperature could lead to an increase of the net efficiency up to 3.2% for the SCOC-CC cycle and up to 0.8% for the E-MATIANT cycle. The final comparison showed that the Allam cycle’s net efficiency is 5.6% higher compared to the SCOC-CC cycle, and 11.5% higher compared with the E-MATIANT cycle.

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Section: Mathematical Model Of the Cooled Carbon Dioxide Gas Turbinementioning

confidence: 99%

Research and Development of the Oxy-Fuel Combustion Power Cycles with CO2 Recirculation

Rogalev

Kindra

et al. 2021

Energies

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“…For traditional TPPs using the Brayton cycle, an increase in the initial temperature of the medium is followed by an increase in efficiency. The results of the parametric studies of the thermal circuit for a system using the Allam cycle show that the further increase in the initial temperature of the Allam cycle above 1100 °C for every 100 °C leads to a decrease in the cycle efficiency by 1.5% due to an increase in the relative flow rate by 5%, which results in increased cooling losses and losses in the cold source due to a decrease in the thermal capacity of the Allam cycle regenerative system [12][13].…”

Section: Introductionmentioning

confidence: 99%

Study of the coolant type influence on the thermal and hydraulic characteristics of cooling channels for high-temperature turbine blades in an oxy-fuel energy system

Osipov

Lvov

Ostrovsky

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Electricity consumption by people is increasing every year, followed by an increase in harmful emissions of carbon dioxide into the atmosphere during its generation. A promising solution to the problem of global pollution can be an oxy-fuel technology for energy production. It has been proven that the Allam cycle at an initial temperature of 1100 C is the most efficient oxy-fuel cycle. With a further increase in the initial temperature, the efficiency of this cycle decreases due to an increase in the relative coolant flow rate. This paper discusses the effect of the changeover from carbon dioxide to nitrogen coolant on thermal and hydraulic characteristics of cooling channels for the first-stage blade of a carbon dioxide turbine. We have found that, upon changeover from carbon dioxide to nitrogen cooling, the heat transfer coefficient decreases for a channel with pin intensifiers 1.3 to 1.65 times, for a channel with pin-and-dimple intensifiers, 1.65 to 1.77 times. We have also found that, upon changeover from pin intensifiers to pin-dimple ones, the heat transfer coefficient is increased for a cooling system using carbon dioxide coolant 2.2 to 2.5 times, whereas when using nitrogen coolant, the heat transfer coefficient remains unchanged. It has been also found that, to maintain a constant heat transfer coefficient upon changeover from carbon dioxide to nitrogen coolant, we should provide a 23.6% higher nitrogen flow rates compared to dioxide.

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Oxy-Coal Combustion Power Cycle with N2 Gas Turbine Unit

Kindra

Kaplanovich

Zonov

et al. 2022

SMART Automatics and Energy

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Structural and Parametric Investigations of Oxy-Fuel Combustion Cycles with the Aim of Increasing Efficiency of Electricity Production

Cited by 7 publications

References 18 publications

Research and Development of the Oxy-Fuel Combustion Power Cycles with CO2 Recirculation

Research and Development of the Oxy-Fuel Combustion Power Cycles with CO2 Recirculation

Study of the coolant type influence on the thermal and hydraulic characteristics of cooling channels for high-temperature turbine blades in an oxy-fuel energy system

Oxy-Coal Combustion Power Cycle with N2 Gas Turbine Unit

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