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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 to the center of symmetry of the boiler by 30 degrees and   two are in emergency mode. The computational experiments allowed to obtain   the distributions of the total velocity vector, temperature fields,   concentration fields of carbon monoxides CO, nitrogen dioxide 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 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.

3-D modelling of heat and mass transfer during combustion of low-grade coal