3-D modelling of heat and mass transfer during combustion of low-grade coal
| Autor: | Valeriy Maximov, Saltanat Bolegenova, Aliya Askarova, Pavel Safarik, Symbat Bolegenova, A.O. Nugymanova |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Renewable Energy
Sustainability and the Environment business.industry lcsh:Mechanical engineering and machinery Boiler (power generation) Thermal power station Mechanics emergency mode Coal dust Combustion off-design performance Vortex numerical modeling harmful emission thermal power station Mass transfer Environmental science Coal lcsh:TJ1-1570 Combustion chamber business combustion |
| Zdroj: | Thermal Science, Vol 24, Iss 5 Part A, Pp 2823-2832 (2020) |
| ISSN: | 0354-9836 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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