Numerical investigation of heat transfer characteristics of pulverized coal in the combustion chambers of the heat energy centers of Kazakhstan

A. Askarova; S. Bolegenova; Z. Jankoski; A. Bekmukhamet; Sh. Ospanova; B. Tolymkanova; Zh. Nagashybay

doi:10.26577/2409-6121-2015-2-2-33-42

Authors

A. Askarova Al-Farabi Kazakh National University, IETP, al-Farabi 71, 050040 Almaty, Kazakhstan
S. Bolegenova Al-Farabi Kazakh National University, IETP, al-Farabi 71, 050040 Almaty, Kazakhstan
Z. Jankoski University of Split, Livanjska 5 21000 Split, Croatia
A. Bekmukhamet Al-Farabi Kazakh National University, IETP, al-Farabi 71, 050040 Almaty, Kazakhstan
Sh. Ospanova Al-Farabi Kazakh National University, IETP, al-Farabi 71, 050040 Almaty, Kazakhstan
B. Tolymkanova Al-Farabi Kazakh National University, IETP, al-Farabi 71, 050040 Almaty, Kazakhstan
Zh. Nagashybay Al-Farabi Kazakh National University, IETP, al-Farabi 71, 050040 Almaty, Kazakhstan

DOI:

https://doi.org/10.26577/2409-6121-2015-2-2-33-42

Keywords:

Key words, BKZ-420, combustion, Ekibastuz coal, heat and mass transfer, modeling, pulverized coal, turbulence, two– phase flow. PACS numbers, 44.05. e, 44.15. a

Abstract

This article is devoted to the investigation of thermal characteristics of pulverized coal combustion process in the combustion chamber of the boiler BKZ-420. The greatest changes in the temperature distribution observed in the central part of the combustion chamber in the field of the fuel supply and the air fuel mixture are by burner holes. Carrying out the study of thermal characteristics is an important step during the modeling process of heat and mass transfer from the pulverized coal combustion, which allows to determine the temperature field throughout the volume of the combustion chamber and outlet. It has been determined the optimal combustion technology of high-energy fuel and the best structural parameters of the combustion chamber of the boiler BKZ-420 Almaty thermal power station that improve the wear resistance of power and reduce harmful emissions into the atmosphere (temperature decrease of the furnace wall, opposite the burners on the 3000C, ie 17.24% and secondary reduction of carbon monoxide concentration of CO at the outlet from the furnace at 15% carbon dioxide CO2 – 4.65%, and nitrogen dioxide NO2 – 14%).