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Numerical simulation of coal powder distribution along the air-coal mixture channel influenced by various shutter angles

Zivkovic N., Stefanovic P., Zivkovic G., Cvetinovic D.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2006

z. 68 [231]

261-268

For implementation of the plasma system for mineral oil free combustion support and start-up on power plant boilers few technical problems have be to solved. One of the key requirements in the implementation process is a regulation of coal powder distibution in the mixture channel in order to achieve adequate concentration in the zone where plasma has to be introduced. Regulation of powder distribution with shutters, positioned in the vertical section of the channel after the mills and prior to plasma generators is proposed solution. The paper represents numerical simulation of this problem using numerical software for modelling of two-phase flow problems, developed in Laboratory of Thermal Engineering and Energy. The model is based on Euler-Lagrangian approach. Continual phase was treated by Euleiran and disperse phase was treated Lagrangian approach. For turbulence modelling a well known k-!!! model was used. The computation results were obtained for three combinations of shutter system positions. The input data were velocity profile of continual phase and concentration profile of disperse phase in the inlet cross section, obtained by experiments. On the basis of the presented results it can be concluded that the positions of groups of shutters has a great influence on flow and concentration field in the burner channels, therefore it should be properly adopted as an adequate regulation method.