3-d modeling of heat and mass transfer duringcombustion of solid fuel in bkz-420-140-7ccombustion chamber of kazkhstan

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 r90 = 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 °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.