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

Abstract

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 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 °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.

Numerical investigation of heat and mass transfer processes in the combustion chamber of industrial power plant boiler. Part 1. Flow field, temperature distribution, chemical energy distribution

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Combustion processes in furnace chambers of Kazakhstan TPPs using high-ash coal

“…Fineness of grinding of coal was equal to R90 = 15 %. All numerical calculations were performed on the above-mentioned technique [1][2][3][4][5][6][7]. The coefficient of excess air for furnace α F 1.1÷1.4…”

Research of Characteristics of Heat and Mass Transfer at the Introduction of Technology of Steps Fuel Burning on the BKZ-75 Boiler of the Shakhtinskaya TPP

“…In this regard, the issue of choice, operation, and, first of all, the creation of new, highly efficient energy and resource-saving and "clean" technologies of energy processes becomes relevant. This requires the implementation of a whole range of measures, the most important of which is the use of modern technologies, as well as world achievements in the field of development to optimize the combustion of solid pulverized coal fuel at thermal power plants (TPP) of Kazakhstan [1][2][3][4][5][6][7][8][9]. OFA technology ("Over Fire Air") is currently successfully used all over the world, and especially in Europe, since the introduction of such technology at existing thermal power plants requires low investment and contributes to a significant reduction in NO x emissions..…”