Structural and Parametric Optimization of S–CO2 Nuclear Power Plants

Rogalev, Nikolay; Rogalev, Andrey; Kindra, Vladimir; Komarov, Ivan; Zlyvko, Olga

doi:10.3390/e23081079

Cited by 17 publications

(11 citation statements)

References 19 publications

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“…At a pressure ratio of 1.5, there is a monotonous rise in efficiency while there is a drop for a pressure ratio of 2. Rogalev et al [24] observed a maximum efficiency at a recompression ratio of around 0.35 for a fixed pressure ratio. Opposite trends can be noticed.…”

Section: Optimizationmentioning

confidence: 97%

“…Recompression ratio, ϕ, is an important operational parameter of choice that can decide the performance of the plant [24,37]. Hence, we studied the influence of it on the 1st law efficiency of the power plant.…”

Section: Optimizationmentioning

confidence: 99%

“…Bai et al [23] proposed an improved recompression s-CO 2 coal-fired power plant. Rogalev et al [24] explored the possibility of replacing steam with s-CO 2 in a nuclear power plant and found it to be an attractive option for a working fluid temperature above 455 • C. Some studies on the part load performance of s-CO 2 plants have been reported in the literature. Sanchez et al [25] analyzed a hybrid system comprising a molten carbonate fuel cell and s-CO 2 cycle to evaluate the control strategies at part loads and concluded that mixed strategies give better results compared to individual control strategies.…”

Section: Introductionmentioning

confidence: 99%

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System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Manavalla,

M.,

Daniel

et al. 2023

Sustainability

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Super-critical Carbon dioxide (s-CO2) power plants are considered to be efficient and environmentally friendly compared to the traditional Rankine cycle-based steam power plants and Brayton cycle-based gas turbine power plants. In this work, the system design of a coal-fired 100 MWe double reheat s-CO2 power plant is presented. The system is also optimized for efficiency with turbine inlet pressures and the recompression ratio as the variables. The components needed, mass flow rates of various streams and their pressures at various locations in the system have been established. The plant has been studied based on 1st and 2nd laws at full load and at part loads of 80%, 60% and 40%. Operating parameters such as mass flow rate, pressure and temperature have considerably changed in comparison to full load operation. It was also observed that the 1st law efficiency is 53.96%, 53.93%, 52.63% and 50% while the 2nd law efficiency is 51.88%, 51.86%, 50.61% and 48.1% at 100%, 80%, 60% and 40% loads, respectively. The power plant demonstrated good performance even at part loads, especially at 80% load, while the performance deteriorated at lower loads. At full load, the highest amount of exergy destruction is found in the main heater (36.6%) and re-heaters (23.2% and 19.6%) followed by the high-temperature recuperator (5.7%) and cooler (4.1%). Similar trends were observed for the part load operation. It has been found that the recompression ratio should be kept high (>0.5) at lower loads in order to match the performance at higher loads. Combustion and heat exchange due to finite temperature differences are the main causes of exergy destruction, followed by pressure drop.

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Section: Optimizationmentioning

confidence: 97%

Section: Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Manavalla,

M.,

Daniel

et al. 2023

Sustainability

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“…To design a boiler structure, it is necessary to give a mathematical description of the fluidized or fluidized bed [12]. Fluidization is the process of transition of a layer of granular, finely dispersed material into a fluidized layer under the influence of a fluidizing gas flow, as well as other physical and mechanical influences.…”

Section: Description Of the Research Objectmentioning

confidence: 99%

Numerical study of hydrodynamics processes fluidized bed

Feoktistov,

Kovalev,

Maltsev

et al. 2024

BIO Web Conf.

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Boiler units with a circulating fluidized bed (CFB) have become widespread in foreign countries, since the CFB technology has proven itself to be an effective way to burn various types of solid fuels. Traditionally, when creating domestic boilers, a normative method is used, but it does not take into account the peculiarities of the movement of the fluidized bed. The hydrodynamic characteristics of the layer have a significant impact on the design of the combustion chamber. To determine them, both mathematical and numerical modeling methods are used. As a result of mathematical calculation, the dependence of the fluidization mode on the air supply speed was revealed. Also, through numerical modeling, it was possible to establish the correspondence of the particle motion mode with the data from the mathematical model.

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“…These features are necessary advantages for the future utilizing vehicles such as flying cars and interstellar spacecraft. Multiple availabilities of many power sources like nuclear power [1][2][3], solar power generation [4,5], gas turbines [6,7], and fuel cells [8][9][10] were frequently proposed dealing with S-CO 2 system in recent years.…”

Section: Introductionmentioning

confidence: 99%

Vortex Patterns Investigation and Enstrophy Analysis in a Small Scale S-CO2 Axial Turbine

et al. 2021

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Supercritical carbon dioxide (S-CO2) Brayton cycle system is a promising closed-loop energy conversion system frequently mentioned in the automotive and power generation field in recent years. To develop a suitable design methodology for S-CO2 turbines with better performance, an understanding of the vortex flow patterns and associated aerodynamic loss inside a S-CO2 turbine is essential. In this paper, a hundred-kilowatt level S-CO2 axial turbine is designed and investigated using a three-dimensional transient viscous flow simulation. The NIST Span and Wagner equation of state model that considers the real gas effects is utilized to estimate the thermodynamic properties of the supercritical fluid. The numerical methods are experimentally validated. The results indicates that the aspect ratio and tip-to-hub ratio are different in the S-CO2 turbine from that in the gas turbine, and the vortex flow patterns are influenced notably by these geometrical parameters. Both the vortex structure and moving tracks of passage vortices are changed as a result of large centrifugal force. An interaction between tip leakage vortex and hub passage vortex is observed in the impeller passage and its formation and development mechanism are revealed. To further explore the aerodynamic loss mechanism caused by vortex interaction, the energy loss in the impeller passage is analyzed with the enstrophy dissipation method, which can not only accurately calculate the energy loss but also estimate how the vortical motions occur. It is found that the enstrophy and energy loss can be effectively reduced by vortex interaction between tip leakage vortex and hub passage vortex. The results in this study would increase the knowledge of vortex flow patterns in S-CO2 turbine and the proposed enstrophy production method can be used intuitively to provide a reference for flow vortical motion study in turbines.

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Structural and Parametric Optimization of S–CO2 Nuclear Power Plants

Cited by 17 publications

References 19 publications

System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Numerical study of hydrodynamics processes fluidized bed

Vortex Patterns Investigation and Enstrophy Analysis in a Small Scale S-CO2 Axial Turbine

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