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Numerical simulation of the processes of burning lignite in a vortex furnace with swirling countercurrent flows

Redko Andriy, Dzhyoiev Rafael, Norchak Volodymyr, Pavlovskiiy Serhii, Burda Yurii, Redko Oleksandr, Redko Igor

Production Engineering Archives

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2022

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Vol. 28, Iss. 2

141--149

EN

This work presents the results of a numerical study of the working processes of burning lignite in a vortex furnace with swirling countercurrent flows. The results of computer simulation of the processes of burning lignite with a moisture content of 30%, an ash content of 20% and 35% and a higher calorific value of Qрв = 13.9 MJ/kg and 9.7 MJ/kg, respectively are given. The fields of temperature distribution, gas velocity and particle trajectory in the volume and at the outlet of the furnace are determined. The values of the swirling flow velocity near the exit from the furnace reach 150-170 m/s. Mechanical underburning is 3.7% and 9.4% depending on the ash content. The results of a numerical study have showed that the diameter of lignite particles affects their combustion process: coke particles with an initial diameter from 25 microns to 250 microns burn out by 96%. The furnace provides a complete combustion of pulverized coal particles - 99.8% and of volatiles - 100% at volumetric heat stress in the 2500 kW/m3 furnace. The afterburning of fuel particles containing carbon is ensured by their circulation.

2

Rational parameters of a hybrid geothermal power plant based on Flash/ORC cycles

Redko Andriy, Kulikova Natalia, Ujma Adam, Redko Oleksandr, Burda Yurii, Pivnenko Yurii, Kompan Artem

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

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2021

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Vol. 10 Nr 1

127--133

EN

The numerical simulation results of the thermal scheme of a power plant related to steam and organic cycles are presented. The rational parameters of the cycles of the geothermal energy conversion unit have been determined. In addition, various organic working fluids are studied. The rational parameters of the thermodynamic cycles at a geothermal fluid temperature of 250°C have also been defined.

3

Mathematical modeling of complex heat transfer in a closed internal volume of a high-temperature radiant heater

Redko Andriy, Redko Oleksandr, Kulikova Natalia, Burda Yurii

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

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2019

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Vol. 8 Nr 2

137--145

EN

The results of a numerical analysis of the parameters of a radiant heating system with radiating panels are presented. The effect of the shape and dimensions of the panel, surface material and the presence of thermal insulation are numerically investigated. It is found that the device of re-radiating panels reduces the surface temperature to 450-500°C, but the increase in the surface area of the radiator provides a more uniform radiation intensity over the heated area, not exceeding the permissible parameters according to sanitary and hygienic requirements. The panel device is found to transform the parameters of the short-wavelength radiator into a more comfortable long-wavelength radiator mode.

PL

Przedstawiono wyniki numerycznej analizy parametrów promiennikowego systemu grzewczego z panelami promieniującymi. Numerycznie zbadano wpływ kształtu i wymiarów panelu, materiału powierzchni oraz obecności izolacji termicznej. Ustalono, że urządzenie obniża temperaturę powierzchni do 450-500°C, ale wzrost pola powierzchni emitera zapewnia bardziej równomierne natężenie promieniowania w ogrzewanym obszarze, nie przekraczając dopuszczalnych wymagań sanitarnych i higienicznych. Stwierdzono, że urządzenie panelowe przekształca parametry promiennika o krótkiej długości fali w bardziej komfortowy tryb promiennika o dużej długości fali.