3-D Modeling of Heat and Mass Transfer during Combustion of Solid Fuel in Bkz-420-140-7C Combustion Chamber of Kazkhstan

• Published in: Journal of Applied Fluid Mechanics 2016, Vol.9 (2), p.699-709
• Main Authors: Askarova, A, Bekmukhamet, A, Bolegenova, S, Ospanova, S, Symbat, B, Maximov, V, Beketayeva, M, Ergalieva, A
• Format: Article
• Language: English
• Subjects: Ash; Ashes; BKZ-420; Combustion; Ekibastuz coal; Heat and mass transfer; Modeling; Pulverized coal; Turbulence; Two–phase flow; Boiler furnaces; Boilers; Burning; Calorific value; Coal; Combustion; Combustion chambers; Furnaces; Heat transfer; Mass transfer; Mathematical models; Modelling; Numerical methods; Power plants; Pulverized coal; Solid fuels; Steam; Temperature; Three dimensional models
• ISSN: 1735-3572; 1735-3645
• DOI: 10.18869/acadpub.jafm.68.225.22881

In this paper the results obtained by the numerical method of modeling of Ekibastuz coal burning in BKZ-420 combustion chamber of Kazakhstan Power Plant are presented. They are devoted to the numerical simulation of combustion processes in the furnace boiler BKZ-420. Boiler's steam generates capacity equal 420 T/h. Boiler has six vertical pulverized coal burners arranged in two levels with three burners on the front wall of the boiler. High ash, low-grade coal from Ekibastuz burned in the furnace. Its ash content is 40%, volatile - 24%, humidity-5%, highest calorific value is 16750 kJ/kg. Milling dispersity of coal was equal to R sub(90)= 15%.It was shown in this research that the most intense burning is observed in the central part of the chamber where the flow temperature reaches about 980 [degrees]C and it is seen that the temperature reaches a peak in the cross sections of the burners location. The combustion reaction there occurs more intensively.