Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

The fuel price increase and severe environmental regulations determine energy-saving importance. Useful utilization of low-potential heat sources with 300–400 °С temperature becomes topical. The application of low-temperature power production facilities operating low-boiling heat carriers could be a solution to this problem. A comparative parametric study of a number of heat carriers resulted in a choice of the most promising fluids that are not expensive, have low toxicity and flammability, low ozone depletion and low global warming potential. These heat carriers are considered for application in simple power production cycles with and without regeneration. The main parameters were optimized at the initial temperatures of 323.15–623.15 K. The cycle without regeneration has a maximal net efficiency of 29.34% using the water at an initial temperature of 623.15 K. The regenerative cycle at a temperature below 490 K has its maximal efficiency using a water heat carrier, and at a higher temperature above 490 K with R236ea. The cycle with R236ea at 623.15 K has an electrical net efficiency of 33.30%. Using a water heat carrier, the maximal efficiency can be reached at pressures below 5 MPa for both cycles. Among the organic heat carriers, the minimal optimal initial pressure of a simple cycle is reached with the R236ea heat carrier below 45 MPa without regeneration and below 15 MPa with regeneration. Therefore when utilizing the latent heat with temperatures above 500 K R134a, R236ea and R124 are the most promising organic fluids. Such conditions could be obtained using different industrial sources with water condensation at elevated pressures.

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“…The main parameters in the cycle were calculated according to [39]. The specific power generated by the turbine was calculated by the equation:…”

Section: Modeling Methodsmentioning

confidence: 99%

Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Kindra

Rogalev

et al. 2022

Energies

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“…The majority of power plants currently utilize high-pressure, high-temperature water steam as their medium, and there is currently no full-scale supercritical CO2 power plant [8][9]. There are still many technical obstacles to overcome since almost all of the devices must be redesigned in a supercritical CO2 power plant [10][11]. For example, the sizes of boiler tubes should be recalculated and the structure should be rearranged.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of Furnace Wall Temperature on Pulverized Coal Combustion and NO_x Emissions in a Supercritical CO₂ Boiler

Li¹,

Zhang

2023

J. Phys.: Conf. Ser.

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A study on the combustion process and NOx emission of pulverized coal in a supercritical CO2 boiler was carried out by using the method of numerical simulation. Using a comprehensive combustion model and a post-treatment NOx formation model, the influence of wall temperature on the characteristics of combustion and NOx emissions of a 300 MW tangential coal-fired boiler were studied. The temperature field and the concentration distribution of waste flue gas at the furnace outlet are analysed and studied. It was found that the furnace wall temperature seriously affected both the distribution of the temperature field and the emission of NOx. The supercritical CO2 boiler’s partial flow strategy led to further increases in temperature and NOx near the tail. According to the results of the calculations, the supercritical CO2 boiler might raise the exhaust gas temperature, making the difficulty of extracting energy from waste gas increased dramatically. The increased NOx emissions will lead to higher cost for implementation of after treatment of NOx emissions. The work’s findings can be used to improve the design of coal-fired supercritical CO2 boilers as well as gain a deeper comprehension of the formation of NOx.

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A self-condensation supercritical carbon dioxide Rankine cycle system realized by absorption refrigeration

Hou

2023

Applied Thermal Engineering

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Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

Cited by 9 publications

References 26 publications

Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Numerical Investigation of the Influence of Furnace Wall Temperature on Pulverized Coal Combustion and NO_x Emissions in a Supercritical CO₂ Boiler

A self-condensation supercritical carbon dioxide Rankine cycle system realized by absorption refrigeration

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Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

Cited by 9 publications

References 26 publications

Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Numerical Investigation of the Influence of Furnace Wall Temperature on Pulverized Coal Combustion and NOx Emissions in a Supercritical CO2 Boiler

A self-condensation supercritical carbon dioxide Rankine cycle system realized by absorption refrigeration

Contact Info

Product

Resources

About

Numerical Investigation of the Influence of Furnace Wall Temperature on Pulverized Coal Combustion and NO_x Emissions in a Supercritical CO₂ Boiler