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Numerical simulations of the pulverized coal combustion in a swirl combustor


Autore: S. Jo, H.Y. Kim, S. Park, S.S. Yoon

Collana: BT - 34 - Mag 06 - Energy: production, distribution and conservation

The simulation of the pulverized coal combustion and NO formation have been performed. When the swirl number is increased, the high temperature zone is shifted toward the combustor inlet; however, little influence on the overall gas temperature is observed. The NO emission level predicted using the current modelling approach is well compared with the experimental data. The increase in the secondary swirl air temperature causes the gas velocity to rise because of the air density reduction. The density reduction and the gas velocity increase provide a suitable condition for less drag and, therefore, a deep penetration length. The drag reduction yields the formation of the fuel-lean zone and, eventually, leads to the sufficient mixing with oxygen-rich air prior to the ignition. It is concluded that the high temperature air enhances the pulverized coal combustion with greater swirling strength.

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