WSEAS Transactions on Heat and Mass Transfer
Print ISSN: 1790-5044, E-ISSN: 2224-3461
Volume 9, 2014
Investigation of Turbulence Characteristics of Burning Process of the Solid Fuel in BKZ 420 Combustion Chamber
Authors: , , , , , ,
Abstract: In this paper the results obtained by the numerical method of modelling of Ekibastuz coal burning in BKZ-420 combustion chamber of Kazakhstan Power Plant. There are devoted to the numerical simulation of combustion processes in the furnace boiler BKZ-420. Boiler’s steam generating capacity equal 420 T/h. Boiler (Fig.2) 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 16 750 kJ/kg. Milling dispersity of coal was equal to R90 = 15 %. It this research was shown that the most intense burning is observed in the central part of the chamber where the flow temperature reaches about 980 °C and it is seen the temperature reaches a peak in the cross sections of the location of the burners. There combustion reaction occurs more intensively.
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Keywords: BKZ-420, combustion, Ekibastuz coal, heat and mass transfer, modeling, pulverized coal, turbulence, two–phase, flow
Pages: 39-50
WSEAS Transactions on Heat and Mass Transfer, ISSN / E-ISSN: 1790-5044 / 2224-3461, Volume 9, 2014, Art. #5