Abstract: Lignite pre-drying and dry lignite firing is considered as an important development step for the next generation of lignite power plants. The integration of a predrying system in future lignite power plants, which utilizes low temperature steam for the drying process, combined with the further thermal utilization of lignite’s evaporated moisture, may bring an […]

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Abstract: The present paper presents a three-dimensional numerical investigation of a pulverized-fuel, tangentially-fired utility boiler located at Florina/Greece under air, partial and full oxy-fuel conditions. Heat and mass transfer and major species concentration, such as CO2, CO and O2 are calculated; whilst the results for the reference air case scenario studied are in good agreement […]

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Abstract: The arithmetic results from the formulation of an EMMS analysis for the calculation of drag coefficient between the co-existing phases in a CFB riser were implemented in a CFD code and three dimensional simulations of the isothermal flow of a 1.2 MWth CFBC unit were performed. Gas and inert material were modeled in an […]

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Abstract: The arithmetic results from the formulation of an EMMS analysis for the calculation of drag coefficient between the co-existing phases in a CFB riser were implemented in a CFD code and three dimensional simulations of the isothermal flow of a 1.2 MWth CFBC unit were performed. Gas and inert material were modeled in an […]

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Abstract: During the last years, considerable efforts have been made for the optimization of numerical methods simulating the operation of the Circulating Fluidized Bed Combustors (CFBC), which imply both the accuracy increase and the computational cost decrease. A foremost goal is the efficient description of its operation under isothermal conditions and the in-depth understanding of […]

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Abstract: In the current work the co-combustion of Solid Recovered Fuels’ (SRFs’) with brown coal in large scale pulverised coal boilers under different operational conditions is numerically investigated. In order to overcome the difficulty of the complex, inhomogeneous nature of waste recovered fuels, SRF is modelled as a mixture of two different fractions, the biogenic […]

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Abstract: The present study presents a three-dimensional numerical model for co-firing lignite and biomass in large-scale utility boilers. The model takes into account the non-spherical form of the biomass particle, which influences the drag coefficient and its devolatilization and combustion mechanisms. Simulations under different co-firing rations and biomass particle sizes are performed for a 300 MWe […]

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Abstract: The pre-drying technology is expected to play an important role in the next generation of brown coal power plants. The integration of the fluidised bed drying system with internal heat utilization (WTA technology) is estimated to bring an efficiency increase of up to 6 percentage points in future brown coal power plants compared to […]

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Abstract: The application of lignite pre-drying technologies in next generation of lignite power plants by utilizing low pressure steam as a drying medium instead of hot recirculated flue gas – combined with thermal utilization of the vaporized coal moisture – is expected to bring efficiency increase of 2-4 percentage points in future lignite power plants […]

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“CFD applications in steam boilers”, N. Nikolopoulos, A. Nikolopoulos, E. Karambinis, M. Agraniotis, P. Grammelis, E. Kakaras, included as a chapter in “Engineering applications of Computational Fluid Dynamics” Vol. 1 p. 23, ISBN-13: 978-1466231061


Torrefaction is considered as a kind of mild pyrolysis that is carried out in inert atmosphere (usually nitrogen). During this process, the moisture of the initial fuel and part of volatiles are removed from the biomass particles into the inert atmosphere resulting in advanced biomass properties as high energy density, hydrophobicity and durability. The most […]

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This paper describes the steady-state modeling and simulation of a wood log fired boiler. It is designed and manufactured by THERMODYNAMIKI S.A. (KOMBI), a company based on Northern Greece. Its nominal fuel power is around 32 kW and its efficiency is close to 75%. A specific operating case, selected and experimentally investigated by the manufacturer, is […]