THERMAL SCIENCE

International Scientific Journal

Pavel Safarik

,

Aliya Askarova

,

Saltanat Bolegenova

,

Valeriy Maximov

,

Symbat Bolegenova

,

Aizhan Nugymanova

3-D MODELLING OF HEAT AND MASS TRANSFER DURING COMBUSTION OF LOW-GRADE COAL

ABSTRACT
Using numerical methods, the basic characteristics of heat and mass transfer processes in the furnace chamber of the BKZ-75 boiler of the Shakhtinskaya TPP (Kazakhstan) were studied during a forced partial stop of the supply of coal dust through the burners. Two modes of fuel supply were studied; a direct-flow method of supplying air mixtures, when two direct-flow burners are working and two are in emergency mode and vortex method of supplying air mixtures - two vortex burners with a swirl angle of the air mixture flow and their inclination the center of symmetry of the boiler by 30° and two are in emergency mode. The computational experiments allowed to obtain the distributions of the total velocity vector, temperature fields, concentration fields of CO, NO2 throughout the entire volume of the combustion chamber and conduct a comparative analysis for the two investigated emergency mode (direct-flow and vortex). Based on the results, it can be concluded that in the case of a forced partial stop of the supply of coal dust, the use of the vortex method of supplying air mixtures improves heat and mass transfer processes and allows minimizing emissions of harmful substances.
KEYWORDS
combustion, numerical modeling, thermal power station, off-design performance, emergency mode, harmful emission
PAPER SUBMITTED: 2019-11-07
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2020-01-14
PUBLISHED ONLINE: 2020-02-08
DOI REFERENCE: https://doi.org/10.2298/TSCI191107062S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 5, PAGES [2823 - 2832]
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3-D modelling of heat and mass transfer during combustion of low-grade coal

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